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WO2019022413A1 - Procédé pour empêcher la surchauffe d'un récepteur d'énergie sans fil et d'un émetteur d'énergie sans fil - Google Patents

Procédé pour empêcher la surchauffe d'un récepteur d'énergie sans fil et d'un émetteur d'énergie sans fil Download PDF

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Publication number
WO2019022413A1
WO2019022413A1 PCT/KR2018/007893 KR2018007893W WO2019022413A1 WO 2019022413 A1 WO2019022413 A1 WO 2019022413A1 KR 2018007893 W KR2018007893 W KR 2018007893W WO 2019022413 A1 WO2019022413 A1 WO 2019022413A1
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WO
WIPO (PCT)
Prior art keywords
receiver
transmitter
wireless power
power
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/007893
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English (en)
Korean (ko)
Inventor
박재희
권용일
차대영
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LG Innotek Co Ltd
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LG Innotek Co Ltd
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Filing date
Publication date
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Publication of WO2019022413A1 publication Critical patent/WO2019022413A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans

Definitions

  • the present invention relates to a wireless power transmission technology, and more particularly, to a wireless power receiver and a wireless power transmitter.
  • the wireless power transmission technology is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field.
  • electric motor or transformer And thereafter, a method of transmitting electrical energy by radiating electromagnetic waves such as high frequency, microwave, and laser has also been attempted.
  • Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.
  • energy transmission using radio may be roughly classified into a magnetic induction method, an electromagnetic resonance method, and an RF transmission method using a short wavelength radio frequency.
  • the magnetic induction method when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils.
  • the magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.
  • the self-resonance method is characterized by using an electric field or a magnetic field instead of using electromagnetic waves or currents.
  • the self-resonance method is advantageous in that it is safe to other electronic devices or human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.
  • RF transmission - takes advantage of the fact that energy can be transmitted and received directly in radio wave form.
  • This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.
  • Wireless power transmission technology can be applied not only to mobile, but also to various industries such as IT, railroad, and household appliance industry.
  • a wireless power transmitter has been studied to detect an over-temperature phenomenon based on a temperature sensed by a temperature sensor provided therein and to overcome the over-temperature phenomenon.
  • the method of preventing overheating of a transmitter that transmits wireless power to a receiver includes: measuring a temperature of the transmitter; Receiving a renegotiated packet from the receiver requesting to enter a renegotiation phase; Receiving a general request packet from the receiver requesting a power transmitter capability packet; Controlling the guaranteed power value based on the measured temperature and the limit temperature; Transmitting the power transmitter capability packet including the guaranteed power value to the receiver; Receiving from the receiver a special request packet for a requested power determined based on the guaranteed power value; And transmitting a response signal for the special request packet to the receiver, wherein the renegotiated packet comprises a flag bit and the limit temperature is changed when the flag bit indicates the overheated status of the receiver .
  • a method of preventing overheating of a receiver for receiving wireless power from a transmitter includes: detecting an overheated state of the receiver; Transmitting to the transmitter a renegotiated packet requesting to enter a renegotiation phase as the receiver is overheated; Transmitting a general request packet requesting a power transmitter capability packet to the transmitter; Receiving from the transmitter the power transmitter capability packet comprising a guaranteed power value of the transmitter; Transmitting to the transmitter a special request packet for a requested power determined based on the power transmitter capability packet; And sending a renegotiation termination request to the transmitter requesting termination of the renegotiation step, wherein the renegotiated packet comprises a flag bit, the guaranteed power value indicating that the flag bit indicates an overtemperature status of the receiver The value can be changed.
  • a method of preventing overheating of a receiver for receiving wireless power from a transmitter includes: detecting an overheated state of the receiver; Sending a renegotiation packet requesting entry to a renegotiation phase as the receiver is overheated; Sending a generic request packet requesting a power transmitter capability packet after entry of the renegotiation step; Transmitting a special request packet for a requested power determined based on the power transmitter capability packet; And sending a renegotiation termination request requesting to terminate the renegotiation step, wherein the renegotiation packet may include a flag bit indicating whether the overheating status of the receiver has been detected.
  • the method for preventing overheating of a transmitter for transmitting wireless power to a receiver includes receiving a renegotiation packet requesting to enter a renegotiation phase as an overheated state of the receiver is detected; Receiving a generic request packet requesting a power transmitter capability packet after entry of the renegotiation step; Transmitting the power transmitter capability packet including a guaranteed power value; Receiving a special request packet for a requested power determined based on the guaranteed power value; And transmitting a response signal to the special request packet, wherein the renegotiated packet may include a flag bit indicating whether an overheating state of the receiver has been detected.
  • a method of preventing overheating of a receiver for receiving radio power from a transmitter comprising: sensing an overheating state of the receiver; Sending a renegotiation packet requesting entry to a renegotiation phase as the receiver is overheated; Transmitting a special request packet indicating whether an overheated state of the receiver has been sensed after entry of the renegotiation step; Transmitting a general request packet requesting a power transmitter capability packet; Transmitting a special request packet for a requested power determined based on the power transmitter capability packet; And sending a renegotiation termination request requesting to terminate the renegotiation step.
  • a method for preventing overheating of a transmitter for transmitting wireless power to a receiver includes receiving a renegotiation packet requesting entry to a renegotiation phase as an overheated state of the receiver is detected; Receiving a special request packet indicating whether an overheated state of the receiver has been sensed after entry of the renegotiation step; Receiving a general request packet requesting a power transmitter capability packet; Transmitting the power transmitter capability packet including a guaranteed power value; Receiving a special request packet for a requested power determined based on the guaranteed power value; And transmitting a response signal to the special request packet.
  • the method for preventing overheating of a transmitter that transmits wireless power to a receiver includes transmitting a Not-Acknowledge (NAK) signal to a receiver power packet of the receiver as the transmitter is overheated ; After entry of the renegotiation step, receiving a generic request packet requesting a power transmitter capability packet; Transmitting the power transmitter capability packet including a guaranteed power value; Receiving a special request packet for the guaranteed power determined based on the guaranteed power value; And transmitting a response signal to the special request packet, wherein the power transmitter capability packet may include a temperature limit warning (TLA) bit indicating whether the transmitter is overheated.
  • TLA temperature limit warning
  • a method of preventing overheating of a receiver that receives radio power from a transmitter comprising: receiving a NAK (Not-Acknowledge) signal for a received power packet of the receiver ; After entry of the renegotiation step, transmitting a general request packet requesting a power transmitter capability packet; Receiving the power transmitter capability packet including a guaranteed power value; Transmitting a special request packet for the guaranteed power determined based on the guaranteed power value; And receiving a response signal for the special request packet, wherein the power transmitter capability packet may include a Temperature Limit Warning (TLA) bit indicating whether the transmitter is overheated.
  • TLA Temperature Limit Warning
  • a method of preventing overheating of a transmitter that transmits wireless power to a receiver comprising: sensing an overheating state of the transmitter; Determining whether the temperature limit information of the receiver has been received for a predetermined time when the transmitter is overheated; And performing an overheat prevention operation when temperature limit information of the receiver is not received, wherein performing the overheating prevention operation comprises: operating a cooler; Lowering the transmission power of the transmitter; And stopping power transmission for a predetermined period of time; Or the like.
  • the present invention can prevent a phenomenon in which charging efficiency is lowered and unnecessary power is wasted due to fake charging that may occur on the side of a wireless power receiver.
  • the present invention can prevent the charging efficiency from being lowered because the battery can not receive power even though the battery has a battery temperature at which normal power can be received.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
  • FIG. 2 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.
  • FIG. 3 is a state transition diagram for explaining a wireless power transmission procedure according to an embodiment of the present invention.
  • 4A is a diagram illustrating a wireless power receiver in accordance with an embodiment of the present invention.
  • FIG. 4B is a detailed embodiment of a portion of the wireless power receiver shown in FIG. 4A.
  • FIG. 4C is a detailed embodiment of another portion of the wireless power receiver shown in FIG. 4A.
  • 5A is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment of the present invention.
  • 5B is a block diagram illustrating a structure of a wireless power transmitter according to another embodiment of the present invention.
  • FIG. 6A is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 5A or FIG. 5B.
  • 6B is a block diagram illustrating a structure of a wireless power receiver according to another embodiment of the present invention.
  • 7A is a diagram for explaining operations performed by a wireless power transmitter and a wireless power receiver according to sensed temperatures.
  • FIG. 7B is a perspective view showing a structure of a wireless power transmitter.
  • 7C is a view showing one transmission coil and a temperature sensor.
  • 7D and 7E are cross-sectional views taken along line A-B in FIG. 7C.
  • 7F and 7G are views showing a plurality of transmission coils.
  • FIG. 10 is a flowchart illustrating a wireless power transmission method according to an embodiment of the present invention.
  • FIG. 11 is a flowchart showing an embodiment of the wireless power transmission method shown in FIG.
  • FIG. 12 is a diagram showing an example of temperature limit information of a receiver.
  • FIG. 13 is a flowchart showing another embodiment of the wireless power transmission method shown in FIG.
  • FIG. 14 is a view showing another example of the temperature limit information of the receiver.
  • 15 is a diagram showing an embodiment of an overheat prevention operation.
  • 16 is a flowchart illustrating a wireless power transmission method according to another embodiment of the present invention.
  • FIG. 17 is a flowchart showing an embodiment of the wireless power transmission method shown in FIG.
  • 18 is a diagram showing an example of transmitter temperature warning information.
  • FIG. 19 is a flowchart illustrating a wireless power transmission method according to another embodiment of the present invention.
  • the method of preventing overheating of a transmitter that transmits wireless power to a receiver includes: measuring a temperature of the transmitter; Receiving a renegotiated packet from the receiver requesting to enter a renegotiation phase; Receiving a general request packet from the receiver requesting a power transmitter capability packet; Controlling the guaranteed power value based on the measured temperature and the limit temperature; Transmitting the power transmitter capability packet including the guaranteed power value to the receiver; Receiving from the receiver a special request packet for a requested power determined based on the guaranteed power value; And transmitting a response signal for the special request packet to the receiver, wherein the renegotiated packet comprises a flag bit and the limit temperature is changed when the flag bit indicates the overheated status of the receiver .
  • an apparatus equipped with a function of transmitting wireless power on a wireless charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, , , A transmitting side, a wireless power transmission device, a wireless power transmitter, and the like are used in combination. Further, for the sake of convenience of explanation, it is to be understood that a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a receiving terminal, a receiving side, A receiver, a receiver, and the like can be used in combination.
  • the transmitter according to the present invention may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, Power can also be transmitted.
  • the transmitter may comprise at least one radio power transmission means.
  • the radio power transmitting means may be various non-electric power transmission standards based on an electromagnetic induction method in which a magnetic field is generated in a power transmitting terminal coil and charged using an electromagnetic induction principle in which electricity is induced in a receiving terminal coil under the influence of the magnetic field.
  • the wireless power transmission means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.
  • WPC Wireless Power Consortium
  • PMA Power Matters Alliance
  • a receiver may include at least one wireless power receiving means, and may receive wireless power from two or more transmitters at the same time.
  • the wireless power receiving means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.
  • WPC Wireless Power Consortium
  • PMA Power Matters Alliance
  • the receiver according to the present invention may be used in a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, A portable electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, a smart watch, etc.
  • a portable electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, a smart watch, etc.
  • the present invention is not limited thereto. It suffices.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
  • the wireless charging system includes a wireless power transmission terminal 10 for wirelessly transmitting power, a wireless power receiving terminal 20 for receiving the transmitted power, and an electronic device 30 Lt; / RTI >
  • the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission.
  • the wireless power receiving terminal 20 modulates the received power signal, (42) may be transmitted to the wireless power transmitting terminal (10).
  • the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 perform out-of-band communication in which information is exchanged using a different frequency band different from the operating frequency used for wireless power transmission .
  • information exchanged between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may include control information as well as status information of each other.
  • the status information and the control information exchanged between the transmitting and receiving end will become more apparent through the description of the embodiments to be described later.
  • the in-band communication and the out-of-band communication may provide bidirectional communication, but the present invention is not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may be provided.
  • the unidirectional communication may be that the wireless power receiving terminal 20 transmits information only to the wireless power transmitting terminal 10, but the present invention is not limited thereto, and the wireless power transmitting terminal 10 may transmit information Lt; / RTI >
  • bidirectional communication is possible between the wireless power receiving terminal 20 and the wireless power transmitting terminal 10, but information can be transmitted only by any one device at any time.
  • the wireless power receiving terminal 20 may acquire various status information of the electronic device 30.
  • the status information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, And is information obtainable from the electronic device 30 and available for wireless power control.
  • the wireless power transmitting terminal 10 can transmit a predetermined packet indicating whether or not to support fast charging to the wireless power receiving terminal 20.
  • the wireless power receiving terminal 20 can inform the electronic device 30 of the connected wireless power transmitting terminal 10 when it is confirmed that it supports the fast charging mode.
  • the electronic device 30 may indicate that fast charging is possible through a predetermined display means, which may be, for example, a liquid crystal display.
  • the user of the electronic device 30 may select the predetermined fast charge request button displayed on the liquid crystal display means to control the wireless power transmitting terminal 10 to operate in the fast charge mode.
  • the electronic device 30 can transmit a predetermined fast charge request signal to the wireless power receiving terminal 20 when the quick charge request button is selected by the user.
  • the wireless power receiving terminal 20 may generate a charging mode packet corresponding to the received fast charging request signal and transmit the same to the wireless power transmitting terminal 10 to switch the general low power charging mode to the fast charging mode.
  • FIG. 2 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.
  • the wireless power transmitter may be equipped with three transmit coils 111, 112, 113. Each transmit coil may overlap a portion of the transmit coil with a different transmit coil, and the wireless power transmitter may include a predetermined sense signal 117, 127 for sensing the presence of the wireless power receiver through each transmit coil - And sequentially transmits digital ping signals in a predefined order.
  • the wireless power transmitter sequentially transmits the detection signal 117 through the primary detection signal transmission procedure shown in the reference numeral 110 and outputs a signal strength indicator (Signal Strength Indicator 116 may identify the received transmit coil 111, 112. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in the reference numeral 120, and the signal strength indicator 126 is transmitted to the transmission coils 111 and 112 It is possible to control the efficiency (or charging efficiency) - that is, the state of alignment between the transmitting coil and the receiving coil - to identify a good transmitting coil and to allow power to be delivered through the identified transmitting coil, .
  • the efficiency or charging efficiency
  • the reason why the wireless power transmitter performs the two detection signal transmission procedures is to more accurately identify to which transmission coil the reception coil of the wireless power receiver is well aligned.
  • the signal strength indicators 116 and 126 are received at the first transmission coil 111 and the second transmission coil 112 as shown in the reference numerals 110 and 120 of FIG. 2, Selects a transmission coil having the best alignment based on the received signal strength indicator 126 in each of the first transmission coil 111 and the second transmission coil 112 and performs wireless charging using the selected transmission coil
  • FIG. 3 is a state transition diagram for explaining a wireless power transmission procedure according to an embodiment of the present invention.
  • power transmission from a transmitter to a receiver is largely divided into a selection phase 310, a ping phase 320, an identification and configuration phase 330, a negotiation phase Phase 360, Calibration Phase 350, Power Transfer Phase 360, and Renegotiation Phase 370.
  • a selection phase 310 a ping phase 320
  • an identification and configuration phase 330 a negotiation phase Phase 360
  • Calibration Phase 350 a negotiation phase Phase 360
  • Power Transfer Phase 360 Power Transfer Phase 360
  • Renegotiation Phase 370 Renegotiation Phase
  • the selection step 310 may be a step of transitioning if a specific error or a specific event is detected while initiating a power transmission or maintaining a power transmission.
  • the specific error and the specific event will become clear through the following description.
  • the transmitter may monitor whether an object is present on the interface surface. If the transmitter detects that an object has been placed on the interface surface, it can transition to the zipping step 320. In the selection step 310, the transmitter transmits an analog ping signal of a very short pulse and, based on the current change of the transmission coil or the primary coil, It is possible to detect whether or not there is an error.
  • the transmitter activates the receiver when an object is detected, and transmits a digital ping to identify whether the receiver is a WPC compliant receiver. If the transmitter does not receive a response signal to the digital ping (e. G., A signal strength packet) from the receiver at step 320, then it may transition back to step 310 again. In addition, the transmitter may transition to the selection step 310 upon receipt of a signal indicating completion of power transmission from the receiver, i.e., a charge completion packet, in a ping phase 320.
  • a response signal to the digital ping e. G., A signal strength packet
  • the transmitter may transition to an identification and configuration step 330 for identifying the receiver and collecting receiver configuration and status information.
  • the transmitter determines whether a packet is received or unexpected, a desired packet is received for a predefined period of time (time out), a packet transmission error (transmission error) (No power transfer contract) to the selection step 310. If the " no power transfer contract "
  • the transmitter may determine whether an entry to the negotiation step 340 is required based on the negotiation field value of the configuration packet received in the identification and configuration step 330.
  • the transmitter may enter negotiation step 340 to perform a predetermined FOD detection procedure.
  • the transmitter may immediately enter the power transfer phase (360).
  • the sender may receive a Foreign Object Detection (FOD) status packet including a reference quality factor value.
  • FOD Foreign Object Detection
  • the transmitter can determine a threshold for FO detection based on the reference quality factor value.
  • the transmitter may determine a threshold or a threshold range for determining the presence or absence of foreign matter using a predetermined threshold generating function that takes a reference quality factor value as a parameter.
  • the transmitter sends the transmittable power to the receiver, and the receiver can send the requested power to be received to the transmitter.
  • the transmittable power may be, for example, a maximum power, a potential power, a guaranteed power, or the like.
  • the transmitter determines whether an unexpected packet is received, a desired packet is received for a predefined period of time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the transition to the selection step 310 can be made.
  • the transmitter may transition to renegotiation phase 370 if it is necessary to reconfigure the power transfer contract based on transmitter state changes, and so on. At this time, if the renegotiation is normally completed, the transmitter may return to power transfer step 360.
  • the power transmission contract may be set based on the status and characteristic information of the transmitter and the receiver.
  • the transmitter status information may include information on the maximum amount of transmittable power, information on the maximum number of receivable receivers, and the receiver status information may include information on the requested power and the like.
  • FIG. 4A is a diagram illustrating a wireless power receiver in accordance with an embodiment of the present invention.
  • FIG. 4B is a detailed embodiment of a portion of the wireless power receiver shown in FIG. 4A.
  • 4C is a detailed embodiment of another portion of the wireless power receiver shown in FIG. 4A.
  • the wireless power receiver is illustrated in FIG. 4A as a mobile terminal (for example, a mobile phone, a smart phone, a tablet, and the like), but the scope of the present invention is not limited thereto.
  • FIG. 4A shows the rear cover 400 of the wireless power receiver, and the rear cover 400 may be equipped with the near field communication coil 401 and the wireless power receiving coil 402.
  • the short range communication coil 402 and the wireless power receiving coil 401 may be disposed at a certain distance from the rear cover 400.
  • the local communication coil 401 and the wireless power receiving coil 402 may be implemented in size and arrangement to prevent electrical connection with each other and to reduce magnetic interference.
  • the local communication coil 401 is a coil for transmitting and receiving data to and from other devices capable of short-range communication.
  • the two terminals AC_N1 and AC_N2 for driving the local communication coil 401 are connected to the corresponding local communication module 430 And can be electrically connected to the two terminals AC_N1 and AC_N2.
  • the wireless power receiving coil 402 is a coil for receiving wireless power transmitted from a wireless power transmitter and each of two terminals AC_W1 and AC_W2 for driving the wireless power receiving coil 402 is connected to a corresponding wireless power receiving module 440, respectively.
  • FIG. 4A shows the body 410 of the wireless power receiver and the body 410 includes an application processor 420, a short range communication module 430, a wireless power receiving module 440, a PMIC IC, 450, and a battery 460.
  • the application processor 420 is a configuration that controls the overall operation of the wireless power receiver including a CPU, a GPU, a modem, an image processor, and various interfaces.
  • the application processor 420 can transmit and receive data to and from the PMIC 450 in an SMPI communication manner using the I2C (Inter Integrated Circuit) communication method between the short distance communication module 430 and the wireless power receiving module 440.
  • I2C Inter Integrated Circuit
  • the short-range communication module 430 may process data for communication with an external short-range communication device through the short-range communication coil 401 under the control of the application processor 420.
  • the short range communication module 430 may operate in accordance with an NFC (Near Field Communication) standard.
  • the short range communication module 430 may include two terminals AC_N1 and AC_N2 to be electrically connected to the short range communication coil 401.
  • the wireless power receiving module 440 processes the data for communication with the external wireless power transmitter through the wireless power receiving coil 402 and performs power conversion to transfer the received wireless power to the battery 460 .
  • the wireless power receiving module 440 may operate according to a Wireless Power Consortium (WPC) or Power Matters Alliance (PMA) standard.
  • WPC Wireless Power Consortium
  • PMA Power Matters Alliance
  • the wireless power receiving module 440 may include two terminals AC_W1 and AC_W2 for being electrically connected to the wireless power receiving coil 402.
  • the wireless power receiving module 440 may include a terminal WLC_I to be electrically connected to the PMIC 450.
  • the wireless power receiving module delivers a predetermined power to the PMIC through the terminal WLC_I.
  • the PMIC 450 is a configuration for managing the charging and discharging of the battery 460.
  • the PMIC 450 can distribute the power of the battery 460 to each configuration included in the wireless power receiver under the control of the application processor 420 at the time of discharging
  • the PMIC 450 may include a terminal WLC_I to be electrically connected to the wireless power receiving module 440.
  • Battery 460 is a configuration for supplying power to each configuration included in the wireless power receiver.
  • the PMIC 450 may include protection means for protecting the battery from overheating. Details will be described with reference to FIG. 4B.
  • the PMIC 450 can notify (notify) the application processor 420 via the SPMI when the battery 460 overheats, for example.
  • the protection means may also include a switch to cut off the path of power applied to the battery. The switch can cut off the power path if it exceeds the limit temperature or reaches a certain percentage of the limit temperature depending on the temperature of the battery.
  • the application processor 420 may receive a notification from the PMIC 450 indicating that battery overheating has occurred and may thus control the wireless power receiving module 440. [ (Alarm) to the wireless power receiving module 440 that an overheating has occurred.
  • the wireless power receiving module 440 may communicate with the wireless power transmitting module to perform an overheating protection operation so that the temperature is no longer increased.
  • Detailed overheat protection operation and communication shall be replaced by detailed descriptions of other drawings.
  • FIG. 4B the structure of the wireless power receiving module 440, the PMIC 450, and the battery 460 shown in FIG. 4A is shown in more detail.
  • the wireless power receiving module 440 and the PMIC 450 are connected to each other through a terminal WLC_I and the PMIC 450 may include a first switch 452 and a second switch 454.
  • the internal power supply means that the internal power supply is supplied as a power source necessary for operation of a configuration inside the wireless power receiver (for example, application processor 420, main memory, display module, touch module, fingerprint recognition module, etc.) .
  • One side of the second switch 454 may be connected to the first switch 452 and the other side of the second switch 454 may be connected to the battery 460.
  • the first switch 452 may transmit or block the DC power of the wireless power receiving module 440 to the internal power supply and the battery 460 according to a predetermined control signal.
  • the first switch 452 may be defined as an overvoltage protection switch.
  • the first switch 452 may be configured to receive a request from the application processor 420 (e.g., if the output voltage of the module is higher than the threshold voltage) or if an abnormality is found in the wireless power receiving module 440
  • the wireless power receiving module 440 may be a switch for interrupting the connection with the wireless power receiving module 440 in accordance with the wireless power receiving disabled state.
  • the second switch 454 may connect or disconnect the battery 460 to and from the wireless power receiving module 440 according to a predetermined control signal.
  • the second switch 454 may be defined as an over-temperature protection switch.
  • the second switch 454 is turned on when an anomaly is detected in the battery 460 (e.g., when the temperature sensed from the battery is higher than the threshold temperature) or a request from the application processor 420 May request to use the power of the wireless power receiving module rather than the power of the battery).
  • the battery 460 may be modeled as a single resistor as shown in FIG. 4A, and the battery 460 may be a lithium-ion battery, but the scope of the present invention is not limited thereto.
  • FIG. 4C shows an antenna module 470 including the short-range communication coil 401 and the wireless power receiving coil 402 shown in FIG. 4A.
  • the antenna module 470 includes a printed circuit board 476, a first antenna 471, a second antenna 472, a third antenna 473, a first connection terminal 474, And a connection terminal 475 as shown in FIG.
  • the first antenna 471 may correspond to the wireless power receiving coil 402, and the second antenna 472 and the third antenna 473 may correspond to the near field communication coil 401.
  • the local communication coil may be omitted.
  • the first connection terminal 474 may correspond to the two terminals AC_W1 and AC_W2 and the second connection terminal 475 may correspond to the two terminals AC_N1 and AC_N2.
  • the antenna module 470 includes a printed circuit board 476, a first antenna 471 pattern-printed and disposed in the central area of the printed circuit board 476 for wireless charging, A second antenna 472 pattern-printed and disposed on the outer periphery of the first antenna 471 for short-range wireless communication, a second antenna 472 so as not to overlap with the second antenna 472 for the second short- A first connection terminal 474 and a second antenna 472 for connecting both ends of the first connection pattern corresponding to the first antenna 471, And a second connection terminal 475 for connecting both ends of the second through third connection patterns corresponding to the third antenna 473, respectively.
  • first connection terminal 474 and the second connection terminal 475 may be physically separated from the printed circuit board 475.
  • the first connection terminal 474 and the second connection terminal 475 may be physically and electrically connected to the printed circuit board 476 such that the first connection pattern does not overlap the second antenna 472 and the third antenna 473. [ And can be separately arranged.
  • connection pattern of each antenna may be formed of a lead wire extending from both ends of the antenna, or may be branched at a specific position of the antenna.
  • connection patterns of the respective antennas and the positions at which the connection terminals are disposed may be arranged such that the length of the connection pattern is minimized.
  • the first local area wireless communication may be Magnetic Secure Transmission (MST) and the second local area wireless communication may be Near Field Communication (NFC).
  • MST Magnetic Secure Transmission
  • NFC Near Field Communication
  • the MST operates in the 3.24 MHz band and the NFC operates in the 13.56 MHz band.
  • the first short range wireless communication may be Near Field Communication (NFC) and the second short range wireless communication may be Magnetic Secure Transmission (MST).
  • NFC Near Field Communication
  • MST Magnetic Secure Transmission
  • the first short range wireless communication and the second short range wireless communication correspond to any one of NFC, RFID communication, Bluetooth communication, UWB (Ultra Wideband) communication, MST communication, Apple Pay communication and Google Pay communication .
  • the antenna pattern may be disposed on the printed circuit board 476 such that a separation distance between the second antenna 472 and the third antenna 473 is maintained at least 1 millimeter (mm) or more.
  • the second antenna 472 and the third antenna 473 are mounted on the printed circuit board (not shown) so that the deviation with respect to the separation distance between the second antenna 472 and the third antenna 473 is maintained below a predetermined first reference value 476 < / RTI >
  • a pattern of the antenna may be disposed on the printed circuit board 476 so that a separation distance between the first antenna 471 and the second antenna 472 is maintained at least 0.5 millimeter (mm) or more.
  • the first antenna 471 and the second antenna 472 are mounted on the printed circuit board (not shown) so that the deviation from the separation distance between the first antenna 471 and the second antenna 472 is maintained below a predetermined second reference value 476 < / RTI >
  • the first antenna 471 may be pattern-printed on both sides of the printed circuit board 476, and patterns printed on both sides through through holes (not shown) Can be conducted. Through this, the resistance component of the first antenna can be reduced, and the reception sensitivity of the antenna can be improved accordingly.
  • the second antenna 472 may be pattern printed on both sides of the printed circuit board 476 and pattern printed on both sides through a through hole (not shown) disposed on the printed circuit board 476 They can be interconnected. Thus, the resistance component of the second antenna can be reduced, and thus the receiving sensitivity of the antenna can be improved.
  • the third antenna 473 may be pattern printed on both sides of the printed circuit board 476 and may be pattern printed on both sides through a through hole (not shown) disposed on the printed circuit board 476 Can be interconnected.
  • the resistance component of the third antenna can be reduced, and the receiving sensitivity of the antenna can be improved accordingly.
  • At least one of the first antenna 471, the second antenna 472, and the third antenna 473 may be pattern-printed on both sides of the printed circuit board 476, The corresponding antenna patterns printed on both sides through the through holes (not shown) disposed in the through holes 476 can be conducted to each other. Through this, the resistance component of the antenna can be reduced, and the receiving sensitivity of the antenna can be improved accordingly.
  • the first antenna 471 may be printed on the printed circuit board 476 in a circular pattern having a predetermined inner diameter, and the first connection terminal may be disposed outside the inner diameter , which is only one embodiment.
  • a temperature sensor may be disposed on the printed circuit board 476.
  • a temperature sensor is disposed to sense the temperature that occurs during wireless power reception.
  • the temperature information may be transmitted to the controller of the wireless power receiving module 440.
  • the wireless power receiving module 440 may perform an overheating protection operation so that the temperature is not further increased through communication with the wireless power transmitting module 440.
  • Detailed overheat protection operation and communication shall be replaced by detailed descriptions of other drawings.
  • 5A is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment of the present invention.
  • a wireless power transmitter 500 generally includes a buck boost converter 510, a voltage / current sensor 520, a driver 530, a resonant switch 540, a transmit coil portion 545, A resonance circuit 550, a communication unit 560, a temperature sensor 570, a cooler 580, and a control unit 590.
  • the resonance switch 540 is a switch for selecting one of the plurality of transmission coils to transmit electric power, and may be omitted when one transmission coil is provided.
  • the cooler 580 may be operated to cool the heat generated during wireless charging to increase the transmission efficiency or shorten the charging time.
  • the cooler 580 may be a fan, a duct connected to the air conditioner, a ventilator, a thermoelectric element, or the like.
  • the cooler 580 may be omitted or the cooler 580 may be omitted. It should be noted that the configuration of the wireless power transmitter 500 described above is not necessarily an essential configuration, and may be configured to include more or less components.
  • the power supply unit 660 can supply DC power of a predetermined intensity.
  • the buck-boost converter 510 may perform a function of converting the DC power supplied from the power supply unit 501 to DC power of a specific intensity according to a control signal of the controller 590.
  • the voltage / current sensor 520 may measure the voltage and / or current of the DC-converted power and provide it to the control unit 590.
  • the control unit 640 may adaptively cut off the power supply from the power supply unit 590 or block the power supply to the driver 530 based on the voltage / current value measured by the voltage / current sensor 520 have.
  • the wireless power receiver 500 may further include a predetermined power cut-off circuit for shutting off the power supplied from the power supply unit 501 or cutting off the power supplied to the driver 530.
  • the driver 530 can convert DC-converted DC power into AC power having a specific operating frequency.
  • the driver 530 may include an inverter and a frequency generator.
  • the inverter may convert DC-converted DC power into AC power based on a reference AC signal generated by the frequency generator, and may be a half bridge inverter or a full bridge inverter.
  • the frequency of the reference AC signal - that is, the operating frequency - can be changed dynamically according to the control signal of the controller 590.
  • the controller 590 may adjust the intensity of the transmitted power by adjusting the operating frequency.
  • the control unit 590 may receive the power reception status information and / or the power control signal of the wireless power receiver through the communication unit 560 and may receive the power control signal based on the received power reception status information and / Determine the frequency, and dynamically control the frequency generator to produce a determined operating frequency.
  • the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like.
  • the power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.
  • the resonance switch 540 may perform a switching function to transmit AC power to the transmission coil selected by the control unit 590.
  • the control unit 590 can select a transmission coil to be used for power transmission to the corresponding wireless power receiver based on the signal strength indicator received for each transmission coil.
  • the transmit coil portion 545 may include at least one transmit coil (three transmit coils in FIG. 5A), and the wireless power transmitter 500 may transmit wireless power through the transmit coil portion 545 But also exchange various control signals and status information with the wireless power receiver.
  • a separate coil corresponding to each of the first to n-th (n is an integral number of) transmitting coils of the transmitting coil part 545 may be additionally provided in the wireless power transmitter 500, It should be noted that the coils may also be used to perform in-band communications with the wireless power receiver.
  • the resonant circuit 550 may include an inductor and a capacitor having predetermined inductance and capacitance.
  • the inductor and the capacitor may be implemented independently for each transmission coil, or may be a configuration in which a plurality of transmission coils are connected to one common capacitor.
  • the capacitor may perform impedance matching as a variable capacitor.
  • the inductor and the capacitor selected from the resonant switch 540 in the resonant circuit 550 can be transmitted from the resonant switch 540 through the corresponding transmission coil.
  • a buck-boost converter 510 for receiving DC power from the outside, DC-DC converting it, converting it to AC power, selecting a transmission coil and delivering power to the selected transmission coil, a driver 530,
  • the resonance circuit 540 and the resonance circuit 550 may be defined as a coil drive portion for transmitting AC power to the transmission coil.
  • the electric power transmitted by the coil driving unit may be determined by the communication unit 560 operating under the control of the control unit 590 and the control unit 590.
  • the communication unit 560 may include at least one of a modulation unit and a demodulation unit.
  • the communication unit 560 can transmit / receive various data (control signal and / or status information) to / from the wireless power receiver through at least one transmission coil of the transmission coil part 545.
  • the modulator may modulate the AC power of the resonant circuit 550 according to the control signal generated by the controller 590 and transmit the modulated AC power to the wireless power receiver.
  • the modulation scheme for modulating the AC power according to the control signal includes a FSK (Frequency Shift Keying) modulation scheme, a Manchester coding modulation scheme, a PSK (Phase Shift Keying) modulation scheme, a Pulse Width Modulation Method, a differential bi-phase modulation method, and the like, but the present invention is not limited thereto.
  • the demodulation unit may demodulate the detected signal and transmit the demodulated signal to the control unit 590 when a signal received through the transmission coil is detected.
  • the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, but is not limited to, various status information for identifying the status of the wireless power receiver.
  • the demodulating unit may identify the signal from which the demodulated signal is received, and may provide the control unit 590 with a predetermined transmission coil identifier corresponding to the identified transmission coil.
  • the wireless power transmitter 500 and the wireless power receiver perform in-band communication, for example.
  • the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.
  • the temperature sensor 570 may measure the internal temperature (surface temperature of the charging interface) of the wireless power transmitter 500 to determine whether overheating occurs, and provide the measurement result to the controller 590.
  • the temperature sensor 570 may be installed in a place where heat generation is severe in the wireless power transmitter 500.
  • the temperature sensor 570 may be installed close to each of the at least one transmission coil, or may be installed close to the position where the rear cover or the wireless power receiving module 440 shown in FIG. 4A is disposed.
  • the on / off state and the operation speed of the cooler 580 can be determined according to the control of the controller 590.
  • the cooler 580 can lower the temperature of the wireless power transmitter 500 and / or the wireless power receiver by externally discharging heat generated by the wireless power transmitter 500 and / or the wireless power receiver.
  • the cooler 580 may be referred to as an active cooling fan or a cooling fan.
  • the position and the direction of the cooler 580 can be operated so that the heat of the portion with a large heat generation is quickly released to the outside.
  • 5B is a block diagram illustrating a structure of a wireless power transmitter according to another embodiment of the present invention.
  • the wireless power transmitter 500-1 may include an inverter 530-1, a transmission coil 545-1, a temperature sensor 570-1, and a controller 590-1. have.
  • the structures and functions of the inverter 530-1, the transmission coil 545-1, the temperature sensor 570-1 and the control unit 590-1 are the same as those of the inverter 530 described in FIG.
  • the wireless power transmitter 500-1 includes one transmitting coil 545-1, the resonant switch 540 may not be included.
  • wireless power transmitter 500 may be incorporated into the configuration of the wireless power transmitter 500-1 so that the wireless power transmitter 500-1 may perform the overheat protection method according to an embodiment of the present invention And some configuration may be added to the wireless power transmitter 500-1.
  • the function of the frequency generator of the driver 530 or the communication unit 560 can be performed by the control unit 590-1.
  • a capacitor connected to the inverter 530-1 and the transmission coil 545-1 to perform impedance matching may be further included in the wireless power transmitter 500-1.
  • FIG. 6A is a block diagram illustrating a structure of a wireless power receiver (or wireless power receiving module) interworking with the wireless power transmitter according to FIG. 5A or FIG. 5B.
  • the wireless power receiver 600 includes a receiving coil 610, a rectifier 620, a DC / DC converter 630, a load 640, a sensing unit 650, 660, and a main control unit 670, as shown in FIG.
  • the communication unit 660 may include at least one of a demodulation unit 661 and a modulation unit 662.
  • the load 640 may be a separate battery configuration.
  • the communication unit 660 may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.
  • the rectifier 620 may convert the AC power to DC power and transmit it to the DC / DC converter 630.
  • the DC / DC converter 630 may convert the intensity of the rectifier output DC power (voltage or current) to a specific intensity (voltage or current) required by the load 640 and then deliver it to the load 640.
  • the sensing unit 650 may measure the intensity of the DC power output from the rectifier 620 and may provide it to the main control unit 670. Also, the sensing unit 650 may measure the intensity of the current applied to the reception coil 610 according to the wireless power reception, and may transmit the measurement result to the main control unit 670. Also, the sensing unit 650 may measure the internal temperature of the wireless power receiver 600 and provide the measured temperature value to the main control unit 670.
  • the main control unit 670 may compare the measured rectifier output DC power with a predetermined reference value to determine whether an overvoltage is generated.
  • the determination of the power can be made on the basis of the current or the voltage as well as the power of the predetermined position.
  • a predetermined packet indicating that an overvoltage has occurred can be generated and transmitted to the modulating unit 662.
  • the signal modulated by the modulating unit 662 may be transmitted to the wireless power transmitter 500 via the receiving coil 610 or a separate coil (not shown).
  • the main control unit 670 can determine that the detection signal is received when the intensity of the rectifier output DC power is equal to or greater than a predetermined reference value.
  • the signal intensity indicator corresponding to the detection signal is received by the modulation unit 662 To be transmitted to the wireless power transmitter 500 via the wireless network.
  • the demodulation unit 661 demodulates the AC power signal between the reception coil 610 and the rectifier 620 or the DC power signal output from the rectifier 620 to identify whether or not the detection signal is received, (670). ≪ / RTI > At this time, the main control unit 670 may control the signal intensity indicator corresponding to the detection signal to be transmitted through the modulation unit 662.
  • 6B is a block diagram illustrating a structure of a wireless power receiver (or wireless power receiving module) according to another embodiment of the present invention.
  • the wireless power receiver 600-1 includes a receiving coil 610-1, a rectifier 620-1, a load 640-1, a temperature sensor 650-1, and a main controller 670- 1).
  • the structures and functions of the receiving coil 610-1, the rectifier 620-1, the load 640-1, the temperature sensor 650-1, and the main controller 670-1 are the same as those
  • the configuration and functions of the receiving coil 610, the rectifier 620, the load 640, the temperature sensor 650, and the main controller 670 are substantially the same.
  • wireless power receiver 600 may be integrated into the configuration of the wireless power receiver 600-1 so that the wireless power receiver 600-1 may perform the overheat prevention method according to the embodiment of the present invention And some configuration may be added to the wireless power receiver 600-1.
  • the function of the communication unit 660 can be performed by the main control unit 670-1.
  • a capacitor connected to the receiving coil 640-1 to perform impedance matching may further be included in the wireless power receiver 600-1.
  • 7A is a diagram for explaining operations performed by a wireless power transmitter and a wireless power receiver according to sensed temperatures.
  • 7B is a perspective view showing a structure of a wireless power transmitter.
  • 7C is a view showing one transmission coil and a temperature sensor.
  • 7D and 7E are cross-sectional views taken along line A-B in FIG. 7C.
  • 7F and 7G are views showing a plurality of transmission coils.
  • the wireless power receiver may include a battery thermistor 710. It may also include a receiver surface thermistor 720.
  • the battery thermistor 710 may be provided inside the wireless power receiver.
  • the receiver surface thermistor 720 may be provided inside the back cover of the wireless power receiver.
  • the battery thermistor 710 or receiver surface thermistor 720 may each be positioned proximate the surface of a battery or a wireless power receiver to sense the temperature of the battery and the temperature of the surface of the wireless power receiver, respectively.
  • the proximity does not mean a contact or a specific distance, but means that the battery has a proper distance to accurately detect the temperature of the surface of the wireless power receiver.
  • the battery thermistor 710 may be installed as close as possible to the main battery of the smartphone (e.g., included in the battery pack). Also, the receiver surface thermistor 720 may be installed as close as possible to the receive coil.
  • the wireless power transmitter may include a transmitter surface thermistor (730).
  • the transmitter surface thermistor 730 may be located on the interior (or surface) of the wireless power transmitter and may be positioned proximate the surface of the wireless power transmitter to sense the temperature of the surface of the wireless power receiver.
  • the transmitter surface thermistor 730 may be installed as close as possible to the transmit coil.
  • the transmitter surface thermistor 730 may correspond to the temperature sensor 570 shown in FIG. 5A.
  • the transmitter surface thermistor 730 described above may correspond to one example of the temperature sensor 160.
  • a wireless power transmitter 100 includes a substrate 101 including a case 101, a transmission coil 170, a temperature sensor 160, a shielding material 180 for shielding, 190).
  • the radio power control unit 140 may be a concept that includes at least one configuration other than the transmission coil in the configuration of the radio power transmitter shown in FIG. 5A or 5B.
  • the shielding member 180 may be made of a high-frequency magnetic material ferrite mainly containing ferric oxide.
  • FIG. 1 A shielding effect can be obtained by using the shielding member 180.
  • FIG. The present invention is not limited to the ferrite, but may be applied to the receiving unit 200 as well as the transmitting coil 170 of the wireless power transmitter 100 in order to satisfy inter-device interference and human harmful standards that may be caused by electromagnetic induction. But it is required to satisfy international EMI (Electro-Magnetic Interference) and EMC (Electro-Magnetic Copability) EMF (electromagnetic field) regulations.
  • EMI Electro-Magnetic Interference
  • EMC Electro-Magnetic Copability
  • EMF electro-Magnetic field
  • the shielding member 180 may be formed with a receiving groove (not shown) for receiving the transmitting coil 170.
  • the entire thickness of the wireless power transmitter 100 can be reduced when the transmitting coil 170 is inserted into the receiving groove of the shield 180.
  • the receive coil of the wireless power receiver may also be inserted into the magnetic body included in the wireless power receiver.
  • the case 101 may receive a substrate 190 including a transmission coil 170, a temperature sensor 160, a shielding material 180, and a wireless power control unit 140.
  • the transmission coil 170 and the temperature sensor 160 and the substrate 190 may be disposed with the shielding material 180 interposed therebetween and the transmission coil 170 and the temperature sensor 160 may be disposed between the wireless power And may be electrically connected to the control unit 140.
  • the transmission coil 170 includes first and second lead wires 171 and 172 extended from both ends so that the transmission coil 170 is connected to the first and second lead wires 171 and 172 (Not shown).
  • the temperature sensor 160 may be connected to the substrate 190 through a connection wiring 161.
  • connection wiring 161 may be drawn to the upper surface of the transmission coil 160.
  • the shield member 180 may have a groove for receiving the connection wiring 161 connected to the temperature sensor 160 and the temperature sensor 160.
  • the overall thickness of the wireless power transmitter 100 is reduced.
  • a bimetal or a thermistor may be used as the temperature sensor 160.
  • thermistor is a device whose electric resistance changes according to temperature, and has advantages of high reliability, robustness, fast response and low cost.
  • the temperature sensor 160 using the thermistor can change the resistance value according to the change of the ambient temperature and the degree of change of the current value can be sensed by the wireless power control unit 140 of the substrate 190.
  • the wireless power control unit 140 may adjust the amount of power to be supplied to the receiving unit 200 based on the ambient temperature sensed by the temperature sensor 160.
  • the temperature sensor 160 may measure the temperature around the transmit coil 170 of the wireless power transmitter 100 and the top surface of the wireless power transmitter 100 (e.g., the side on which the wireless power receiver is located) .
  • the temperature of the upper surface of the wireless power transmitter 100 is measured using the temperature sensor 160
  • the temperature of the upper surface of the wireless power receiver facing the upper surface of the wireless power transmitter 100 can be measured together.
  • the temperature of the upper surface of the wireless power transmitter 100 may be determined as the temperature of the upper surface of the wireless power receiver. Accordingly, the temperature sensor 160 can measure the temperature of the wireless power transmitter 100 as well as the wireless power receiver.
  • the wireless power controller 140 may control the amount of power to be transmitted based on the measured ambient temperature from the temperature sensor 160.
  • the transmission coil 170 need not necessarily be provided, but may be composed of a plurality of transmission coils 170 as shown in FIGS. 7F and 7G.
  • three transmission coils 170 may be provided and overlapped, and two transmission coils 170 may be provided as shown in FIG. 7G, but they may not overlap with each other.
  • the overlapped area is determined in consideration of the deviation of the magnetic flux density.
  • At least one temperature sensor 160 may be provided in at least one of the areas A, B, and C of the transmission coil 170 to measure the temperature of the periphery of the transmission coil 170 through the temperature sensor 160 .
  • a separate temperature sensor (not shown) may be provided on the substrate 190.
  • the temperature sensor 160 located at the periphery of the transmission coil 170 is referred to as a first temperature sensor
  • the temperature sensor provided on the substrate 190 may be referred to as a second temperature sensor.
  • the second temperature sensor can measure the degree of heat generation on the substrate 190 and the wireless power control unit 140 can measure the temperature of the substrate 190 through the temperature measured from the second temperature sensor separately from the first temperature sensor 160. [ When it is judged that the peripheral portion is overheated, the power transmission amount can be adjusted.
  • the reason for including both the first and second temperature sensors as described above is that the cause of the heat generation in the peripheral portion of the substrate 190 and the cause of the heat generation in the peripheral portion of the transmission coil 170 may be different from each other.
  • the first temperature sensor 160 may be located on the upper side of the transmission coil 170 and on the upper surface of the wireless power transmitter 100 as well as on the upper side of the wireless power transmitter 100. [ It is also contemplated that the temperature of the wireless power receiver adjacent to the top surface of the power transmitter 100 may also be subject to measurement.
  • the transmitting coil 170 may be inserted into a coil frame (not shown) including a receiving portion for allowing the transmitting coil 170 to be inserted.
  • each of the coil frame and the ferrite may include a function hole having a predetermined diameter at a position corresponding to the transmission coil 170, and the temperature sensor 160 may be provided on the substrate 190.
  • the temperature sensor 160 may measure the temperature of the transmitting coil 170 and / or the periphery of the substrate 190 through the function hole.
  • the shape of the transmission coil 170 is shown as having a rounded shape and a rectangular shape as a whole, it is not limited to this, and may be a different shape such as a circular shape.
  • the battery temperature sensed by the battery thermistor 710, the receiver surface temperature sensed by the receiver surface thermistor 720, and the transmitter surface temperature sensed by the transmitter surface thermistor 730 are determined by the physical distance between each thermistor , Due to factors such as the material and thickness of the members located between the thermistors. That is, the battery temperature and the receiver surface temperature may have a temperature difference of T1 (T1 is a real number greater than zero), and the receiver surface temperature and transmitter surface temperature may have a temperature difference of T2 (T2 is a real number greater than zero).
  • the wireless power transmitter may prevent overheating of the wireless power transmitter and / or the wireless power receiver in a manner that cuts off the transmit power.
  • the wireless power receiver can prevent the wireless power receiver from overheating by sending a signal to the wireless power transmitter requesting to stop power transmission.
  • the wireless power receiver is able to prevent the communication of power between the wireless power receiver and the wireless power transmitter by interrupting the power delivered to the battery of the wireless power receiver, It is possible to prevent an overheating phenomenon.
  • the predetermined reference value may be set to a value higher than a normal temperature (for example, 12 degrees), and the predetermined reference values for the transmitter surface temperature, the receiver surface temperature, and the battery temperature may be the same or different.
  • the predetermined reference value is a value for determining whether or not the transmitter surface temperature, the receiver surface temperature, and the battery temperature respectively are overheated, and the predetermined reference value for the transmitter surface temperature, the receiver surface temperature, It is defined as temperature and battery limit temperature.
  • the wireless power transmitter will cut off the transmission power to prevent overheating.
  • the battery temperature is sufficiently low compared to the transmitter surface temperature, the battery can not receive power even though it has a battery temperature capable of normal power reception, thereby lowering the charging efficiency.
  • the wireless power receiver will attempt to prevent overheating by shutting off the power delivered to the battery. However, since the power transmission from the wireless power transmitter to the wireless power receiver continues, the battery will lose charging efficiency and waste unnecessary power due to fake charging, which continues the wireless power transmission even when power is not available .
  • receiver limit RX_Limit
  • transmitter limit TX_Limit
  • the receiver limit and the transmitter limit are relative concepts. If the radio power transmission continues normally and the temperature rise continues, before the transmitter surface temperature reaches the transmitter surface limit temperature, if the battery temperature reaches the battery limit temperature or the receiver surface temperature reaches the receiver surface limit temperature, Can be defined as lower than the transmitter limit.
  • the transmitter limit is lower than the receiver limit if the battery temperature reaches the battery limit temperature or the transmitter surface temperature reaches the transmitter surface limit temperature before the receiver surface temperature reaches the receiver surface limit temperature, then the transmitter limit is lower than the receiver limit.
  • the battery can not receive power even though it has a battery temperature that allows normal power reception, and the charging efficiency may be lowered.
  • the receiver limit may be determined by the battery limit temperature and / or the receiver surface limit temperature
  • the transmitter limit may be determined by the transmitter surface limit temperature
  • the battery limit temperature and / or the receiver surface limit temperature may vary depending on the type of the wireless power receiver, the transmission power, and the like, when the transmitter surface limit temperature is fixed to a certain value (for example, The limit and the transmitter limit must be different from each other. The larger the deviation, the more the charging efficiency is lowered.
  • a representative example of the transmitter limit temperature described herein is the transmitter surface limit temperature, and a representative example of the receiver limit temperature may be the battery limit temperature and / or the receiver surface limit temperature.
  • a wireless charging system 800 is shown and the wireless charging system 800 may include a wireless power transmitter 810 and a wireless power receiver 820.
  • the wireless power transmitter 810 may correspond to the wireless power transmitter 500 shown in Figures 5a or 5b and the wireless power receiver 820 may correspond to the wireless power receiver 600 shown in Figure 6a or 6b. can do. That is, the receiving coil 821, the rectifier 822, the DC / DC converter 823, the load 824, and the main controller 825 of the wireless power receiver 820 are connected to the receiving coil 610, the rectifier 620, A DC / DC converter 630, a load 640, and a main control unit 670, as shown in FIG.
  • the load 824, the PMIC 826, and the power switch 827 may be separate configurations in the cellular phone.
  • the wireless power receiver 820 may further include a PMIC (Power Management IC) 826.
  • the PMIC 826 may be implemented as part of, or independently of, an application processor (AP) (not shown) included in the wireless power receiver.
  • the load 824 refers to the battery and the PMIC 826 can control the power switch 827 based on the result of comparing the battery temperature that measured the temperature of the load 824 with a preset battery limit temperature.
  • the power switch 827 may be communicated from the wireless power transmitter 810 to deliver or block the converted DC power to the load 824.
  • the power switch 827 may refer to the first switch 452 and / or the second switch 454 of FIG. 4B included in the PMIC 826 or may be a switch independent of the PMIC 826.
  • the power switch 827 may be defined as an overheat protection switch that cuts off the power delivered to the load 824, which is the battery when the overheated condition of the receiver is sensed.
  • the PMIC 826 opens the power switch 827, even though the battery temperature is above the battery limit temperature, Wireless power transmission from the transmitter 810 to the wireless power receiver 820 may result in subsequent fake charging.
  • FIG. 9 a change in charge amount with time of a wireless power receiver 820 in which a fake charging occurs is illustrated.
  • the wireless power transmitter 810 continues to transmit the wireless power to the wireless power receiver 920, and power dissipation occurs
  • the power switch 827 is again short-circuited at the end of the first section P1 to allow power to be delivered to the battery to increase the charge amount .
  • the power switch 827 opens and the charge amount no longer increases.
  • the wireless power transmission from the wireless power transmitter 810 to the wireless power receiver 820 continues in the second section P2, power dissipation occurs.
  • the total charge time to complete the charge of the battery may be increased. This increase in charging time may lead to degradation of the wireless power transmitter and the wireless power receiver.
  • the PMIC 826 does not connect the power switch 827, so that even when charging for a long time, the 100% charge amount may not be reached.
  • 10 is a flowchart illustrating a wireless power transmission method according to an embodiment of the present invention.
  • 11 is a flowchart showing an embodiment of the wireless power transmission method shown in FIG. 12 is a diagram showing an example of temperature limit information of a receiver.
  • 13 is a flowchart showing another embodiment of the wireless power transmission method shown in FIG. 14 is a view showing another example of the temperature limit information of the receiver.
  • 15 is a diagram showing an embodiment of an overheat prevention operation.
  • FIG. 11 illustrates the operation of the wireless power transmitter 1000 and the wireless power receiver 1050 when the receiver limit is less than the transmitter limit.
  • the normal power transmission state S10 refers to a state in which wireless power transmission from the wireless power transmitter 1000 to the wireless power receiver 1050 is normally performed (power transmission step 360 in FIG. 3)
  • the temperature of the battery, the transmission coil, and the reception coil rises as the operation S10 continues.
  • the wireless power transmitter 1000 and the wireless power receiver 1050 can sense the overheat state based on the temperature information of the temperature sensors provided in the wireless power transmitter 1000 and the wireless power receiver 1050, respectively.
  • the wireless power receiver 1050 can detect the overheating state of the receiver (S20) before the transmitter surface temperature reaches the transmitter surface limit temperature.
  • the overheated state of the receiver may correspond to a superheating phenomenon occurring on the side of the wireless power receiver 1050, and may mean that the battery temperature reaches the battery limit temperature or the receiver surface temperature reaches the receiver surface limit temperature.
  • the overtemperature state of the receiver means that the battery temperature (or receiver surface temperature) reaches a certain percentage (e.g., 80%) of the battery limit temperature (or receiver surface limit temperature) It is possible. This is to allow the wireless power transmitter 1000 to inform the receiver of the overheated state of the battery before the power switch PSW is shut down due to the battery temperature reaching the battery limit temperature so as not to interrupt the charging of the battery.
  • the overheated state of the receiver may be a case where it is detected that the current transmitted from the DC / DC converter 823 to the load 824 by the main controller 825 is less than the reference current have. This means that the fake charging situation is proceeding and that the power switch PSW is shut off, so that the wireless power transmitter 1000 is informed of the overheat state of the receiver so that the charging of the battery can be started quickly.
  • the wireless power receiver 1050 which senses the overheating state of the receiver may transmit the temperature limit information of the receiver to the wireless power transmitter 1000 (S30). At least one of the steps S30 to S60 described below can be performed in the negotiation step 340 or the renegotiation step 370.
  • Wireless power receiver 1050 may initiate negotiation phase 340 or renegotiation phase 370 by sending the receiver's temperature threshold information to wireless power transmitter 1000.
  • FIG. 11 one embodiment of a procedure for indicating that a wireless power receiver 1050 has detected an overtemperature condition at a wireless power transmitter 1000 is illustrated.
  • the wireless power receiver 1050 when the wireless power receiver 1050 detects an overheating state during the normal power transmission (S10) in the power transmission step, the wireless power receiver 1050 transmits a renegotiate packet to the wireless power transmitter 1000, (S1110).
  • the renegotiated packet may be a request to initiate the renegotiation step 370 and may include temperature limit information of the receiver.
  • FIG. 12 a message structure of temperature limit information of a receiver according to another embodiment of the present invention is shown.
  • the temperature limit information of the receiver may be implemented as part of the renegotiate packet 1200.
  • the renegotiated packet 1200 is a message that the wireless power receiver 1050 can send to the wireless power transmitter 1000 to initiate the renegotiation phase 370.
  • the renegotiated packet 1200 may have a size of one byte.
  • the FCS 1201 which is the first bit b7, may mean a flag bit indicating whether or not an overheating state of the receiver is detected. If the FCS 1201 is set to zero, it may indicate that the receiver is not in an overtemperature condition.
  • the renegotiated packet 1200 may be a message requesting to initiate the renegotiation phase 370 while indicating the temperature threshold information of the receiver.
  • the temperature threshold information may include a command to cause the receiver to perform a protection operation to prevent the transmitter from increasing beyond the current temperature.
  • the transmitter is to reset the preset transmitter limit temperature to perform the overheat protection operation.
  • the renegotiated packet 1200 with the first bit b7 FCS 1201 set to 1 is set to 1 by setting the transmitter surface boundary temperature to the current transmitter surface temperature, Reset (or set) the request.
  • the remaining bits (b6 to b0, 1202) can be set to all zeros as reserved bits.
  • the wireless power transmitter 1000 may transmit a response signal (ACK) in response to a renegotiation request (S1115).
  • the acknowledgment signal (ACK) may be a signal acknowledging the renegotiation request of the wireless power receiver (1050).
  • the wireless power receiver 1050 may send a general request packet to the wireless power transmitter (S1120).
  • the message format of the general request packet may be configured to include a Request field.
  • the request field may be used by the wireless power receiver to request certain information from the wireless power transmitter 1000.
  • the request field may be set to 0x31 to request the power transmitter capability packet of the wireless power transmitter 1000.
  • the general request packet may be sent if a change of power transfer contract or power transfer contract is required.
  • the wireless power transmitter 1000 receiving the general request packet may send a power transmitter capability packet to the wireless power receiver 1050 (S1130).
  • the message format of the power transmitter capability packet may comprise a Power Class field, a Guaranteed Power Value field, a Potential Power Value field, a WPID field, and a Not Res sens field. have.
  • the guaranteed power value may be the amount of power delivered by the wireless power transmitter 1000 in accordance with the state of the wireless power transmitter 1000. That is, the guaranteed power value may be a variation value that may vary depending on the state of the wireless power transmitter 1000. [ For example, when a plurality of transmitters share a single power supply, the energy provided by a single power supply is limited, so the guaranteed power value is determined by the wireless power receiver 1050 at which the wireless power transmitter 1000 simultaneously provides power, Gt; < / RTI >
  • the potential power value may be the amount of power that the wireless power transmitter 1000 is designed to deliver. That is, the potential power value may be a unique value determined according to the design of the wireless power transmitter 1000 regardless of the state of the wireless power transmitter 1000. In one example, if a plurality of transmitters share a single power supply, the potential power value may not depend on the number of wireless power receivers 1050 for which the wireless power transmitter 1000 simultaneously provides power.
  • the wireless power receiver 1050 receiving the power transmitter capability packet may send a specific request packet to the wireless power transmitter 1000 (S1140).
  • the message format of the special request packet may include a Request field and a Reqquest Parameter field.
  • information regarding a parameter to be changed may be recorded.
  • the requested parameter field may be written with the changed value of the parameter specified by the request field.
  • the wireless power receiver may record 0x00 in the request field and record the change count, i.e., the count number, in the request parameter field.
  • the wireless power receiver may transmit 0x00 in the request field. That is, if the request field is 0x00, the negotiation phase or the renegotiation phase can be terminated as well as changing the count of the power transmission contract.
  • the wireless power receiver can write 0x01 in the request field and record the guaranteed power in the requested parameter field and transmit it.
  • the wireless power receiver may receive a power transmitter capability packet that includes the guaranteed power value of the wireless power transmitter, and may determine the guaranteed power that the wireless power receiver desires to receive based on the guaranteed power value.
  • the guaranteed power recorded by the receiver in the special request packet may mean the requested power.
  • the wireless power receiver can write 0x02 in the request field and write the header of the 24-bit received power packet in the request parameter field.
  • the wireless power transmitter 1000 may transmit a response signal (ACK) for the special request packet to the wireless power receiver 1050 (S1050).
  • the acknowledgment signal (ACK) for the special request packet may be a message that accepts the power transfer contract according to the request field of the special request packet and the request parameter.
  • a response signal to it may be a message that the wireless power transmitter 1000 provides the guaranteed power value to the wireless power receiver 1050.
  • the wireless power receiver 1050 may send a renegotiation termination request to the wireless power transmitter 1000 (S1160).
  • the renegotiation termination request may mean a special request packet whose request field is 0x00.
  • the wireless power transmitter 1000 may send a response signal (ACK) to the special request packet to terminate the renegotiation phase (S1170). Thereby, the renegotiation step is terminated and the power transmission step can be started.
  • ACK response signal
  • FIG. 13 another embodiment of a procedure for notifying wireless power receiver 1050 that wireless power transmitter 1000 has detected an overtemperature condition is illustrated.
  • the wireless power receiver 1050 may transmit the renegotiated packet to the wireless power transmitter 1000 (S1110 ).
  • the renegotiated packet may be a request to initiate the renegotiation phase 370, and the first bit b7, FCS 1201, may be set to zero. On the other hand, all the remaining bits b6 to b0, 1202 can be set to zero.
  • the wireless power transmitter 1000 may transmit a response signal (ACK) in response to the renegotiation request (S1315).
  • the acknowledgment signal (ACK) may be a signal acknowledging the renegotiation request of the wireless power receiver (1050).
  • the wireless power receiver 1050 may send a special request packet to the wireless power transmitter 1100 (S1320).
  • the special request packet may include temperature limit information of the receiver.
  • FIG. 14 a message structure of temperature limit information of a receiver according to another embodiment of the present invention is shown.
  • the temperature limit information of the receiver may be implemented as a special request packet 1400.
  • the special request packet 1400 may have a size of two bytes and may include a request field 1401 of one byte and a request parameter field 1402 of a byte.
  • the request field 1401 indicates the type of the special request packet 1400, for example, 0x04 may indicate that the message is for maximum power.
  • the request field 1401 may be any one of 0x05 to 0xEF, but the scope of the present invention is not limited thereto.
  • the request field 1401 is 0x05
  • the special request packet 1400 is temperature limit information of the receiver.
  • the temperature limit information of the receiver may be temperature limit for over temperature protection.
  • the request parameter field 1402 indicates a setting value according to the type of the special request packet 1400. For example, when the request field 1401 is 0x04, the request parameter field 1402 indicates a maximum power value .
  • the values 00 to FF of the request parameter field 1402 may include information for resetting the transmitter's limit temperature.
  • the limit temperature of the transmitter may mean the transmitter surface temperature limit of the wireless power transmitter 1000.
  • the receiver's temperature threshold information may be a request to reset the transmitter surface boundary temperature to the current transmitter surface temperature.
  • the receiver's temperature threshold information may be a request to reset the transmitter surface threshold temperature by a value corresponding to the request parameter field 1402 to reset.
  • the request parameter field 1402 may be control information for resetting the limit temperature of the transmitter.
  • the wireless power transmitter 1000 may send a response signal (ACK) to the wireless power receiver 1050 for a special request packet.
  • ACK response signal
  • the wireless power receiver 1050 may send a general request packet to the wireless power transmitter 1000 (S1330).
  • the general request packet may be sent if a change of power transfer contract or power transfer contract is required.
  • the wireless power transmitter 1000 receiving the general request packet may transmit the power transmitter capability packet to the wireless power receiver 1050 (S1340).
  • the wireless power receiver 1050 may send a special request packet to the wireless power transmitter 1000 (S1350).
  • the wireless power transmitter 1000 may transmit a response signal (ACK) for the special request packet to the wireless power receiver 1050 (S1360).
  • ACK response signal
  • the acknowledgment signal (ACK) for the special request packet may be a message accepting the power transfer contract according to the request field and the request parameter in the special request packet.
  • the wireless power receiver 1050 may send a renegotiation termination request to the wireless power transmitter 1000 (S1370).
  • the renegotiation termination request may mean a special request packet whose request field is 0x00.
  • the wireless power transmitter 1000 may send a response signal (ACK) to the special request packet for terminating the renegotiation phase (S1380). Thereby, the renegotiation step is terminated and the power transmission step can be started.
  • FCS renegotiated packet
  • the wireless power transmitter 1000 may reset the transmitter's limit temperature to the transmitter's current temperature upon receipt of the receiver's temperature limit information (S40).
  • the limit temperature of the transmitter may mean the transmitter surface limit temperature.
  • the critical temperature of the initial transmitter is set at a value higher than a normal temperature (for example, 12 degrees).
  • the wireless power transmitter 1000 may reset the transmitter surface temperature limit to the current transmitter surface temperature.
  • the surface temperature of the current transmitter may refer to the surface temperature of the most recently measured transmitter.
  • the surface temperature of the current transmitter may mean an average value of the surface temperatures of recently measured transmitters (e.g., an average value of the surface temperatures measured within the last three times).
  • resetting the transmitter surface temperature limit to the current transmitter surface temperature is intended to make the receiver limit equal to the transmitter limit, and the wireless power receiver 1050 may adaptively change the transmitter surface temperature limit.
  • the wireless power transmitter 1000 compares the transmitter surface temperature limit with the current transmitter surface temperature to lower the transmit power or to operate the cooler 580 if it is within a certain range to enable the wireless power transmitter 1000 and / 1050) can be lowered. Therefore, by resetting the transmitter surface temperature limit to the current transmitter surface temperature, it is possible to prevent the charging efficiency from being lowered due to the fake charging that may occur on the side of the wireless power receiver 1050 and wasting unnecessary power in advance.
  • the wireless power transmitter 1000 can actively perform the overheat prevention operation upon reception of the temperature limit information of the receiver. This means that reception of the temperature limit information of the receiver means that the wireless power receiver 1050 has overheated, and the temperature of the wireless power receiver 1050 is immediately lowered so that the wireless power transmission can be resumed again.
  • the overheat protection operation S50 may be an operation for lowering the temperature of the wireless power transmitter 1000 and / or the wireless power receiver 1050.
  • the overheat preventing operation S50 may include an operation S51 for operating the cooler 580, an operation S52 for lowering the transmission power, and / or an operation S53 for interrupting the power transmission for a predetermined period of time At least one.
  • Each of the operations (S51 to S53) can be performed sequentially or selectively.
  • the operation S51 of operating the cooler 580 means that the cooler 580 operates according to the operation speed and time determined by the control of the control unit 590 of the wireless power transmitter 500.
  • the operation of lowering the transmission power may be performed by the wireless power transmitter 1000 when the wireless power transmitter 1000 senses the overheating state (i.e., when the flag bit receives the renegotiation packet indicating the overheat state of the receiver) It may be an operation of changing (lowering) the guaranteed power value field of the capability packet.
  • the operation of lowering the transmission power may be such that the wireless power receiver 1050 which senses the overheat state requests the special power of the special request packet, which is transmitted in step S1140 or S1350, Recording operation.
  • the degree to which the required power is recorded at a low level can be determined by the ratio of the battery temperature (or the receiver surface temperature) to the battery limit temperature (the receiver surface limit temperature), but the scope of the present invention is not limited thereto.
  • lowering the transmit power may be an operation in which the wireless power receiver 1050 transmits a control error packet for lowering the transmit power in the power transmit phase.
  • the operation S52 of lowering the transmission power may be any one of the above three embodiments, or may be two or more of the above three embodiments.
  • the operation S53 for interrupting the power transmission for a predetermined time may be an operation for interrupting the power transmission with the communication connection between the wireless power transmitter 1000 and the wireless power receiver 1050 being maintained.
  • the predetermined time may be determined by the value of the request parameter field 1402 of the special request packet received from the wireless power receiver 1050.
  • stopping power transmission for a predetermined time may terminate the communication connection between the wireless power transmitter (1000) and the wireless power receiver (1050) and transition to the selection step (310) (Step 310) and then enter the zing stage 320. [ This is to prevent the wireless power receiver 1050 and the wireless power transmitter 1000 from sufficiently radiating to the outside by not entering the pinging stage 320 immediately.
  • Steps S40 to S60 may be performed simultaneously with the transmission of the signal, or in parallel with the transmission of the signal, between the time when the signal described in FIG. 11 or 13 is transmitted.
  • the wireless power transmitter 1000 can monitor the decrease in the transmitter surface temperature in accordance with the overheat prevention operation and if the transmitter surface temperature does not reach the preset temperature (-3 degrees from the temperature in the overheat prevention operation) (No in S60) , The wireless power transmitter 1000 can continue to perform step S50.
  • the wireless power transmitter 1000 may again enter the normal power transmission state and transmit the wireless power to the wireless power receiver 1050 (S70).
  • the wireless power receiver 1050 when the wireless power receiver 1050 detects that the receiver surface temperature has reached the receiver surface limit temperature, the wireless power receiver 1050 immediately stops transmitting power to the wireless power transmitter 1000 Of course, the request can be sent.
  • 16 is a flowchart illustrating a wireless power transmission method according to another embodiment of the present invention.
  • FIG. 17 is a flowchart showing an embodiment of the wireless power transmission method shown in FIG.
  • 18 is a diagram showing an example of transmitter temperature warning information.
  • FIG. 16 shows the operation of the wireless power transmitter 1000 and the wireless power receiver 1050 when the transmitter limit is less than the receiver limit.
  • the normal power transmission state (S110) refers to a state in which wireless power transmission from the wireless power transmitter 1000 to the wireless power receiver 1050 is normally performed (power transmission step 360 in FIG. 3)
  • the temperature of the battery, the transmitting coil, and the receiving coil rises as the temperature (S110) continues.
  • the wireless power transmitter 1000 can detect the transmitter's overtemperature condition before the receiver surface temperature (or battery temperature) reaches the receiver surface limit temperature (or battery limit temperature) (S120).
  • the overheated state of the transmitter may correspond to a superheating phenomenon occurring on the side of the wireless power transmitter 1000 and may mean a state where the transmitter surface temperature reaches the transmitter surface limit temperature.
  • the transmitter's overtemperature condition may refer to a condition where the transmitter surface temperature reaches a certain percentage (e.g., 80%) of the transmitter surface temperature limit. This is because the transmitter's surface temperature reaches the transmitter's surface limit temperature to notify the wireless power receiver 1050 of the overheated state of the receiver before the wireless power transmission by the wireless power transmitter 1000 is terminated, So that the charging of the battery is not interrupted.
  • the wireless power transmitter 1000 which senses the transmitter's overheating condition, may transmit the temperature warning information of the transmitter to the wireless power receiver 1050 (S130). At least one of steps S130 through S160 described below may be performed in the negotiation step 340 or the renegotiation step 370. [
  • FIG. 17 an embodiment of a procedure for indicating that the wireless power transmitter 1000 has detected an overtemperature condition at the wireless power receiver 1050 is shown.
  • the wireless power transmitter 1000 determines that it is necessary to change the power transmission contract, ) Or a NAK packet in response to a received power packet of the wireless power receiver 1050 to initiate the renegotiation step 370 (S1705).
  • the received power packet may include a received power value corresponding to an average rectifier received power value calculated during a predetermined period.
  • the wireless power receiver 1050 receiving the NAK packet may transmit the renegotiated packet to the wireless power transmitter 1000 to perform the renegotiation step (S1710).
  • the renegotiated packet may be a request to initiate the renegotiation phase 370, and the first bit b7, FCS 1201, may be set to zero. On the other hand, all the remaining bits b6 to b0, 1202 can be set to zero.
  • the wireless power transmitter 1000 may transmit a response signal (ACK) in response to the renegotiation request (S1715).
  • the acknowledgment signal (ACK) may be a signal acknowledging the renegotiation request of the wireless power receiver (1050).
  • the wireless power receiver 1050 may send a general request packet to the wireless power transmitter 1000 (S1720).
  • the general request packet may be sent if a change of power transfer contract or power transfer contract is required.
  • the wireless power transmitter 1000 receiving the general request packet may transmit the power transmitter capability packet to the wireless power receiver 1050 (S1730).
  • FIG. 18 a message structure of temperature warning information of a transmitter according to an embodiment of the present invention is shown.
  • the temperature alert information of the transmitter may be implemented as part of a power transmitter capability packet 1800.
  • the power transmitter capability packet 1800 may have a size of 3 bytes and may include a power class, a guaranteed power value, a potential power value, a wireless power transmitter 1000, A Not Res Sens bit for the design specification of the wireless power transmitter 1000, and a Thermal Limit Alert (TLA) bit for indicating the WPID packet (a unique identifier for identifying the corresponding standard compliant device) ) ≪ / RTI >
  • TLA Thermal Limit Alert
  • the temperature limit warning bit 1801 may indicate the temperature warning information of the transmitter. That is, if the temperature limit warning bit 1801 is set to zero, it may indicate that the transmitter surface temperature is below the transmitter surface limit temperature. If the temperature limit warning bit 1801 is set to 1, it may indicate that the transmitter surface temperature is above the transmitter surface temperature limit.
  • the transmitter's temperature alert information may be a request to notify the wireless power transmitter 1000 that it has detected an overtemperature condition of the transmitter and how to reset the transmitter surface threshold temperature.
  • the wireless power receiver 1050 receiving the temperature warning information of the transmitter can determine the overheat rate of the receiver (S140).
  • the overheat ratio of the receiver means a ratio based on the present battery temperature (or receiver surface temperature) and the battery limit temperature (or receiver surface limit temperature), and the current battery temperature (or receiver surface temperature) Surface temperature limit ").
  • the overtemperature ratio of the receiver can be determined by the formula "(battery limit temperature - battery temperature) / battery limit temperature” or "(receiver surface limit temperature - receiver surface temperature) / receiver surface limit temperature”.
  • the overheat ratio of the receiver means a margin until the temperature of the wireless power receiver 1050 reaches the limit temperature
  • the increase of the transmitter surface limit temperature can be determined in proportion to the overheat rate of the receiver.
  • the wireless power receiver 1050 can determine the increase of the transmitter surface boundary temperature using a table mapping the overheat rate of the receiver and the increase of the transmitter surface boundary temperature, but the scope of the present invention is not limited thereto .
  • the wireless power receiver 1050 may transmit the temperature limit information of the receiver to the wireless power transmitter 1050 for an increase in the transmitter surface boundary temperature determined in accordance with the overheat rate of the receiver at step S150.
  • the wireless power receiver 1050 which has determined the increase in the transmitter surface boundary temperature, transmits a special request packet including the temperature limit information of the receiver to the increase of the transmitter surface temperature limit to the wireless power transmitter 1000 (S1740).
  • the temperature limit information of the receiver is the special request packet 1400 in which the request field 1401 is one of 0x05 to 0xEF and the request parameter field 1402 is the specific value 01 to FF .
  • the value of the request parameter field 1402 may correspond to an increase in the transmitter surface boundary temperature.
  • the wireless power transmitter 1000 may transmit a response signal (ACK) for the special request packet to the wireless power receiver 1050 (S1750).
  • ACK response signal
  • the transmission of the special request packet and the response signal can be additionally performed for the power transmission contract.
  • the wireless power receiver 1050 may send a renegotiation termination request to the wireless power transmitter 1000 (S1760).
  • the renegotiation termination request may mean a special request packet whose request field is 0x00.
  • the wireless power transmitter 1000 may transmit an acknowledgment (ACK) to the special request packet to terminate the renegotiation step (S1770). Thereby, the renegotiation step is terminated and the power transmission step can be started.
  • ACK acknowledgment
  • the wireless power transmitter 1000 may reset the transmitter's limit temperature to the transmitter's current temperature upon receipt of the receiver's temperature threshold information (S160).
  • the transmitter's limit temperature may refer to the transmitter surface temperature limit
  • the wireless power transmitter 1000 may reset the transmitter surface limit temperature to a temperature corresponding to the request parameter field 1402 (i.e., to a higher temperature) .
  • resetting the transmitter surface temperature limit to the temperature corresponding to the request parameter field 1402 is to make the receiver limit equal to the transmitter limit, and the wireless power receiver 1050 may adaptively change the transmitter surface limit temperature have. Therefore, by raising the transmitter surface limit temperature by a specific criterion, the battery can not receive power even though it has a battery temperature capable of normal power reception, thereby preventing the charging efficiency from being lowered.
  • the wireless power transmitter 1000 and / or the wireless power receiver 1050 may perform an overheat prevention operation (S170) to lower the temperature of the wireless power transmitter 1000 and / or the wireless power receiver 1050.
  • S170 overheat prevention operation
  • the overheat preventing operation S170 may be at least one of an operation to operate the cooler 580, an operation to lower the delivery power, and / or an operation to stop the power transmission for a certain period of time, as in Fig. Each operation can be performed sequentially or selectively.
  • the operation of operating the cooler 580 means that the cooler 580 is operated according to the operation speed and time determined by the control of the control unit 590 of the wireless power transmitter 500.
  • the operation of lowering the transmission power may be an operation in which the wireless power transmitter 1000 that senses the overheating state records the guaranteed power value field of the power transmitter capability packet transmitted in step S1730 at a low level.
  • the operation of lowering the transmission power may be an operation in which the wireless power receiver 1050 recognizing the overheated state records the requested power in the request parameter field of the special request packet lower than a predetermined value.
  • the operation of lowering the transmit power may be an operation in which the wireless power receiver 1050 transmits a control error packet for lowering the transmit power in the power transmit step.
  • the operation of lowering the transmission power may be any of the above three embodiments, or may be two or more of the three embodiments.
  • the operation of interrupting the power transmission for a certain period of time may be an operation of interrupting the power transmission while the communication connection between the wireless power transmitter 1000 and the wireless power receiver 1050 is maintained.
  • the predetermined time may be determined by the ratio of the transmitter surface temperature and the transmitter surface limit temperature.
  • the operation of interrupting the power transmission for a certain period of time terminates the communication connection between the wireless power transmitter 1000 and the wireless power receiver 1050, transitions to the selection step 310, ), And then enters the pinging step 320.
  • FIG. This is to prevent the wireless power receiver 1050 and the wireless power transmitter 1000 from sufficiently radiating to the outside by not entering the pinging stage 320 immediately.
  • the steps S160 through S170 may be performed simultaneously with the transmission of the signal or in parallel with the transmission of the signal between the transmission time of the signal described in FIG.
  • the wireless power transmitter 1000 may again enter the normal power transmission state and transmit the wireless power to the wireless power receiver 1050 (S180).
  • FIG. 19 is a flowchart illustrating a wireless power transmission method according to another embodiment of the present invention.
  • FIG. 19 shows the operation of the wireless power transmitter 1000 and the wireless power receiver 1050 when the transmitter limit is less than the receiver limit.
  • the normal power transmission state (S210) refers to a state in which wireless power transmission from the wireless power transmitter 1000 to the wireless power receiver 1050 is normally performed (power transmission step 360 in FIG. 3)
  • the temperature of the battery, the transmission coil, and the reception coil rises as the temperature (S210) continues.
  • the wireless power transmitter 1000 can detect the transmitter's overtemperature condition before the receiver surface temperature (or battery temperature) reaches the receiver surface limit temperature (or battery limit temperature) (S220).
  • the transmitter's overtemperature may refer to a condition where the transmitter surface temperature reaches the transmitter surface temperature limit.
  • the transmitter's overtemperature condition may refer to a condition where the transmitter surface temperature reaches a certain percentage (e.g., 80%) of the transmitter surface temperature limit. This allows the wireless power transmitter 1000 itself to adjust the limit temperature of the transmitter before the transmitter surface temperature reaches the transmitter surface temperature limit so that the charging of the battery is not interrupted prior to the interruption of the wireless power transmission by the wireless power transmitter 1000 It is for this reason.
  • the wireless power transmitter 1000 that senses the transmitter's overheating condition determines whether it has received temperature threshold information of the receiver for a predetermined time (e.g., 1 second, 5 seconds, 10 seconds, etc.) from the wireless power receiver 1050 (S230). At least one of the steps S230 to S250 described below may be performed in the negotiation step 540 or the renegotiation step 570. [
  • the wireless power receiver 1050 may determine that there is some room for the current battery temperature (or receiver surface temperature) to reach the battery limit temperature (or the receiver surface critical temperature).
  • the wireless power transmitter 1000 may reset the transmitter surface temperature limit to a predetermined temperature (e.g., current transmitter surface temperature limit + 5 degrees) (S240).
  • a predetermined temperature e.g., current transmitter surface temperature limit + 5 degrees
  • resetting the transmitter surface temperature limit to a predetermined temperature is intended to bring the receiver limit closer to the transmitter limit. Therefore, by raising the transmitter surface limit temperature by a specific criterion, the battery can not receive power even though it has a battery temperature capable of normal power reception, thereby preventing the charging efficiency from being lowered.
  • the wireless power transmitter 1000 and / or the wireless power receiver 1050 may perform an overheat protection operation (S250) to lower the temperature of the wireless power transmitter 1000 and / or the wireless power receiver 1050.
  • S250 overheat protection operation
  • the overheat preventing operation S250 may be at least one of the operation for operating the cooler 580, the operation for lowering the delivery power, and / or the operation for stopping the power transmission for a certain period of time, as in Fig. Each operation can be performed sequentially or selectively.
  • the operation of operating the cooler 580 means that the cooler 580 is operated according to the operation speed and time determined by the control of the control unit 590 of the wireless power transmitter 500.
  • the operation of lowering the transmission power may be an operation in which the wireless power transmitter 1000 which senses the overheating state records the guaranteed power value field of the power transmitter capability packet low.
  • the operation of lowering the transmission power may be an operation in which the wireless power receiver 1050 recognizing the overheated state records the requested power in the request parameter field of the special request packet lower than a predetermined value.
  • the wireless power transmitter 1000 transmits a NAK (Not-Acknowledge) packet in response to the received power packet in the power transmission step, .
  • the NAK packet may be a signal requesting the wireless power receiver 1050 to transmit the renegotiated packet to enter the renegotiation phase.
  • the operation of lowering the transmit power may be an operation in which the wireless power receiver 1050 transmits a control error packet for lowering the transmit power in the power transmit step.
  • the operation of lowering the transmission power may be any of the above three embodiments, or may be two or more of the three embodiments.
  • the operation of interrupting the power transmission for a certain period of time may be an operation of interrupting the power transmission while the communication connection between the wireless power transmitter 1000 and the wireless power receiver 1050 is maintained.
  • the predetermined time may be determined by the ratio of the transmitter surface temperature and the transmitter surface limit temperature.
  • the operation of interrupting the power transmission for a certain period of time terminates the communication connection between the wireless power transmitter 1000 and the wireless power receiver 1050, transitions to the selection step 310, ), And then enters the pinging step 320.
  • FIG. This is to prevent the wireless power receiver 1050 and the wireless power transmitter 1000 from sufficiently radiating to the outside by not entering the pinging stage 320 immediately.
  • the wireless power transmitter 1000 may enter the normal power transmission state again and transmit the wireless power to the wireless power receiver 1050 (S260).
  • steps S210 through S260 may be repeated wherein the wireless power transmitter 1000 gradually resets the transmitter surface marginal temperature to a predetermined temperature , But may be set such that the transmitter surface temperature limit does not exceed a predetermined maximum temperature (e.g., 60 degrees). This is because it protects the wireless power transmitter 110 and may be a wireless power receiver in which the wireless power receiver 1050 basically does not transmit temperature limit information of the receiver.
  • a predetermined maximum temperature e.g. 60 degrees
  • the operation of the wireless power transmitter 1000 described with reference to FIGS. 10 to 19 (resetting the limit temperature of the transmitter, performing the overheat prevention operation, determining the overheating, detecting the overheating state of the transmitter, generating the temperature warning information of the transmitter,
  • the operation of the wireless power receiver 1050 (sensing the overtemperature state of the receiver, generating the temperature threshold information of the receiver, determining the overtemperature ratio of the receiver, etc.) may be performed by the controller of the power transmitter 1000, Or the PMIC, but the scope of the present invention is not limited thereto.
  • the methods according to the above-described embodiments may be implemented as a program for execution in a computer and stored in a computer-readable recording medium.
  • Examples of the computer-readable recording medium include ROM, RAM, CD- , A floppy disk, an optical data storage device, and the like.
  • the computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.
  • the present invention can be applied to a wireless charging field, and in particular, to a wireless power transmitter and a wireless power receiver equipped with an overheat prevention function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Un procédé pour empêcher la surchauffe d'un émetteur destiné à transmettre une puissance sans fil à un récepteur selon un mode de réalisation de la présente invention peut comprendre les étapes consistant à : mesurer la température de l'émetteur ; recevoir, en provenance du récepteur, un paquet de renégociation qui demande l'entrée dans une phase de renégociation ; recevoir, en provenance du récepteur, un paquet de demande générale qui demande un paquet de capacité d'émetteur d'énergie ; commander une valeur de puissance garantie sur la base de la température mesurée et d'une température critique ; transmettre, au récepteur, le paquet de capacité d'émetteur d'énergie comprenant la valeur de puissance garantie ; recevoir, en provenance du récepteur, un paquet de demande spéciale pour une puissance requise déterminée sur la base de la valeur de puissance garantie ; et transmettre, au récepteur, un signal de réponse au paquet de demande spéciale, le paquet de renégociation comprenant un bit indicateur, et la température critique ayant une valeur modifiée lorsque le bit indicateur indique un état de surchauffe du récepteur.
PCT/KR2018/007893 2017-07-25 2018-07-12 Procédé pour empêcher la surchauffe d'un récepteur d'énergie sans fil et d'un émetteur d'énergie sans fil Ceased WO2019022413A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020170094420A KR20190011638A (ko) 2017-07-25 2017-07-25 무선 전력 수신기 및 무선 전력 송신기의 과열방지 방법
KR10-2017-0094420 2017-07-25

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WO2019022413A1 true WO2019022413A1 (fr) 2019-01-31

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CN111864842A (zh) * 2020-07-24 2020-10-30 宝能(广州)汽车研究院有限公司 预充电阻的过热保护方法、装置、系统及存储介质
US20220140642A1 (en) * 2020-11-02 2022-05-05 Aira, Inc. Thermal Regulation For Wireless Charging Pad
US11444485B2 (en) * 2019-02-05 2022-09-13 Mojo Mobility, Inc. Inductive charging system with charging electronics physically separated from charging coil
CN118074361A (zh) * 2024-02-21 2024-05-24 湖南炬神电子有限公司 一种利用无线充检测异物发热的装置及其方法
EP4191829A4 (fr) * 2020-07-30 2025-02-19 LG Electronics, Inc. Dispositif de réception d'énergie sans fil et dispositif de transmission d'énergie sans fil

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CN112825432B (zh) * 2019-11-20 2024-10-11 华为技术有限公司 一种无线充电系统和无线充电方法

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US11444485B2 (en) * 2019-02-05 2022-09-13 Mojo Mobility, Inc. Inductive charging system with charging electronics physically separated from charging coil
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CN118074361A (zh) * 2024-02-21 2024-05-24 湖南炬神电子有限公司 一种利用无线充检测异物发热的装置及其方法

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