[go: up one dir, main page]

WO2025097301A1 - Détection de récepteur dans un transfert d'énergie sans fil - Google Patents

Détection de récepteur dans un transfert d'énergie sans fil Download PDF

Info

Publication number
WO2025097301A1
WO2025097301A1 PCT/CN2023/130193 CN2023130193W WO2025097301A1 WO 2025097301 A1 WO2025097301 A1 WO 2025097301A1 CN 2023130193 W CN2023130193 W CN 2023130193W WO 2025097301 A1 WO2025097301 A1 WO 2025097301A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless power
response
detection
frequency sweep
controller
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.)
Pending
Application number
PCT/CN2023/130193
Other languages
English (en)
Inventor
Sheng YUAN
Shangfeng JIANG
Hulong Zeng
Bo Tang
Eric Tong Lin Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renesas Electronics America Inc
Original Assignee
Renesas Electronics America Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renesas Electronics America Inc filed Critical Renesas Electronics America Inc
Priority to PCT/CN2023/130193 priority Critical patent/WO2025097301A1/fr
Publication of WO2025097301A1 publication Critical patent/WO2025097301A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • 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

Definitions

  • the present disclosure relates in general to apparatuses and methods for receiver detection in wireless power transfer.
  • a wireless power system can include a transmitter having a transmission coil and a receiver having a receiver coil.
  • the transmission coil and the receiver coil can be brought close to one another to form a transformer that can facilitate inductive transmission of alternating current (AC) power.
  • the receiver can include a rectifier circuit that can convert the AC power into direct current (DC) power for various loads or components that require DC power to operate.
  • a controller can be configured to perform a frequency sweep on a transmitter coil of a wireless power transmitter at a plurality of frequencies.
  • the plurality of frequencies can include a resonant frequency of a detection capacitor parallel to a receiver coil in a wireless power receiver.
  • the controller can be further configured to determine whether the wireless power receiver is present or absent on a charging region connected to the wireless power transmitter based on a phase response of the frequency sweep.
  • an apparatus for wireless power transfer can include a transmitter and a controller.
  • the transmitter can include a transmitter coil and a primary capacitor connected in series with the transmitter coil.
  • the transmitter coil and the primary capacitor can form a LC tank.
  • the controller can be configured to perform a frequency sweep on the LC tank at a plurality of frequencies.
  • the plurality of frequencies can include a resonant frequency of a detection capacitor parallel to a receiver coil in a wireless power receiver.
  • the controller can be configured to determine whether the wireless power receiver is present or absent on a charging region connected to the transmitter based on a phase response of the frequency sweep.
  • a method for wireless power transfer can include performing a frequency sweep on a transmitter coil of a wireless power transmitter at a plurality of frequencies.
  • the plurality of frequencies can include a resonant frequency of a detection capacitor parallel to a receiver coil in a wireless power receiver.
  • the method can further include determining whether the wireless power receiver is present or absent on a charging region of the wireless power transmitter based on a phase response of the frequency sweep.
  • Fig. 1 is a diagram showing an example system that can implement receiver detection in wireless power transfer in one embodiment.
  • Fig. 2A is a diagram showing an example implementation of receiver detection in wireless power transfer in one embodiment.
  • Fig. 2B is a diagram showing an example phase response from an implementation of receiver detection in wireless power transfer in one embodiment.
  • Fig. 2C is a diagram showing another example phase response from an implementation of receiver detection in wireless power transfer in one embodiment.
  • Fig. 3 is a diagram showing an adaptive implementation of receiver detection in wireless power transfer in one embodiment.
  • Fig. 4 is a diagram showing a combination of a high power technique with receiver detection in wireless power transfer in one embodiment.
  • Fig. 5 is a flow diagram illustrating a process of implementing receiver detection in wireless power transfer in one embodiment.
  • Fig. 1 is a diagram showing an example system 100 that can implement receiver detection in wireless power transfer in one embodiment.
  • System 100 can include a transmitter 110 and a receiver 120 that are configured to wirelessly transfer power and data therebetween via inductive coupling. While described herein as transmitter 110 and receiver 120, each of transmitter 110 and receiver 120 can be configured to both transmit and receive power or data therebetween via inductive coupling.
  • Transmitter 110 is configured to receive power from one or more power supplies and to transmit AC power 130 to receiver 120 wirelessly.
  • transmitter 110 may be configured for connection to a power supply 116 such as, e.g., an AC power supply or a DC power supply.
  • Transmitter 110 can include a controller 112 and an analog front end (AFE) 118.
  • AFE 118 can include various analog circuitry and integrated circuits (ICs) , such as a driver circuit, or driver 114, configured drive a coil TX of transmitter 110.
  • ICs integrated circuits
  • Controller 112 can be configured to control and operate AFE 118.
  • Controller 112 can include, for example, at least one processor (e.g., a processor 154) , central processing unit (CPU) , field-programmable gate array (FPGA) or any other circuitry that is configured to control and operate power driver 114.
  • Controller 112 can further include at least one memory devices such as read only memory (ROM) , random access memory (RAM) , electrically-erasable programmable read only memory (EEPROM) , or other types of memory devices.
  • Controller 112 may include any other circuitry that is configured to control and operate various components of operations of transmitter 110.
  • controller 112 can be configured to control power driver 114 to drive coil TX of to produce a magnetic field.
  • Power driver 114 can be configured to drive coil TX at a range of frequencies and configurations defined by wireless power standards, such as, e.g., the Wireless Power Consortium (Qi) standard, the Power Matters Alliance (PMA) standard, the Alliance for Wireless Power (Afor WP, or Rezence) standard or any other wireless power standards.
  • wireless power standards such as, e.g., the Wireless Power Consortium (Qi) standard, the Power Matters Alliance (PMA) standard, the Alliance for Wireless Power (Afor WP, or Rezence) standard or any other wireless power standards.
  • Receiver 120 can be configured to receive AC power 130 transmitted from transmitter 110 and to supply the power to one or more loads 126 or other components of a destination device 140.
  • Load 126 may include, for example, a battery charger that is configured to charge a battery of the destination device 140, a DC-DC converter that is configured to supply power to a processor, a display, or other electronic components of the destination device 140, or any other load of the destination device 140.
  • Destination device 140 may comprise, for example, a computing device, mobile device, mobile telephone, smart device, tablet, wearable device or any other electronic device that is configured to receive power wirelessly.
  • destination device 140 can include receiver 120.
  • receiver 120 may be separated from destination device 140 and connected to destination device 140 via a wire or other component that is configured to provide power to destination device 140.
  • Receiver 120 can include a controller 122 and a power rectifier 124 ( “rectifier 124” ) .
  • Controller 122 can include, for example, at least one processor, a CPU, an FPGA or any other circuitry that may be configured to control and operate power rectifier 124.
  • Controller 122 can further include at least one memory devices such as ROMs, RAMs, EEPROMs, or other types of memory devices.
  • Power rectifier 124 includes a coil RX and is configured to rectify power received via coil RX into a power type as needed for load 126.
  • Power rectifier 124 is configured to rectify AC power received from coil RX into DC power 132 which may then be supplied to load 126.
  • power rectifier 124 can be a part of an AFE of receiver 120. Power rectifier 124 can facilitate driving coil RX to transmit signals encoding messages to coil TX of transmitter 110.
  • the magnetic field produced by coil TX of power driver 114 induces a current in coil RX of power rectifier 124.
  • the induced current causes AC power 130 to be inductively transmitted from power driver 114 to power rectifier 124.
  • Power rectifier 124 receives AC power 130 and converts AC power 130 into DC power 132.
  • DC power 132 is then provided by power rectifier 124 to load 126.
  • Transmitter 110 and receiver 120 are also configured to exchange information or data, e.g., messages, via the inductive coupling of power driver 114 and power rectifier 124.
  • a power contract may be agreed upon and created between receiver 120 and transmitter 110.
  • receiver 120 may send communication packets 136 or other data to transmitter 110 that indicate power transfer information such as, e.g., an amount of power to be transferred to receiver 120, commands to increase, decrease, or maintain a power level of AC power 130, commands to stop a power transfer, or other power transfer information.
  • receiver 120 in response to receiver 120 being brought in proximity to transmitter 110, e.g., close enough such that a transformer may be formed by coil TX and coil RX to facilitate power transfer, receiver 120 may be configured to initiate communication by sending a signal to transmitter 110 that requests a power transfer. In such a case, transmitter 110 may respond to the request by receiver 120 by establishing the power contract or beginning power transfer to receiver 120. For example, if the power contract is already in place. Transmitter 110 and receiver 120 may transmit and receive communication packets, data or other information via the inductive coupling of coil TX and coil RX.
  • coil TX and a primary capacitor Cp in transmitter 110 can form a primary LC tank.
  • Coil RX and a secondary capacitor Cs in receiver 120 can form a secondary LC tank.
  • the primary LC tank in transmitter 110 and the secondary LC tank in receiver 120 can resonate at the same resonant frequency.
  • Receiver 120 can include a detection LC tank formed by coil RX and a detection capacitor Cd.
  • the resonant LC tank formed by coil RX and Cd can resonate at a resonant frequency different from resonant frequency of the primary and secondary LC tanks.
  • the primary and secondary LC tanks can resonate at 100 kilohertz (kHz) and the detection LC tank can resonate at 1 megahertz (MHz) .
  • Secondary LC tank in receiver 120 can receive the AC power 130 being provided by transmitter 110 (via the primary LC tank) .
  • the detection LC tank in receiver 120 can be used for detection and communication purposes.
  • the secondary LC tank and the detection LC tank in receiver 120 has different resonant frequencies.
  • the bandwidth of the detection LC tank is greater than the bandwidth of the secondary LC tank in order to produce effective data communication packets.
  • Transmitter 110 can be connected to a charger dock surface 150.
  • Charger dock surface 150 can include a charging region 152.
  • Coil TX can be in proximity to charging region 152 such that a receiver (e.g., receiver 120) being placed on charging region 152 can receive AC power 130 from transmitter 110.
  • Transmitter 110 can be configured to monitor charging region 152 of charger dock surface 150 to detect if objects are being placed in charging region 152 or removed from charging region 152.
  • Transmitter 110 can also be configured to determine whether objects being placed on charging region 152 is a foreign object or a wireless power receiver.
  • a wireless power transmitter when an object is placed on a charging region, can determine whether the object is a foreign object or a wireless power receiver. Some techniques for this determination can include low power techniques such as Q factor detection. Q factor can be a parameter that indicates losses in metallic structures at resonant frequency. Q factor detection can include having the wireless power transmitter send a low power signal to the object and using envelope detection techniques on a response from the object to determine a Q factor of the object. However, various metal objects and coils, such as receiver coils of wireless power receiver, can have similar Q factor values. Therefore, if the object is a metal object, the wireless power transmitter can mistakenly determine that a wireless power receiver is placed on charging region. Further, the low power signal being used in Q factor detection may not be sufficient to wake up a wireless power receiver.
  • Q factor detection can include low power techniques such as Q factor detection.
  • Q factor detection can include having the wireless power transmitter send a low power signal to the object and using envelope detection techniques on a response from the object to determine a Q factor of the object.
  • Another technique for determining whether the object is a foreign object or a wireless power receiver can include a digital ping technique.
  • Digital ping can include sending a high power signal to the object, where the high power signal is sufficient to wake up a wireless power receiver. If the object is a foreign object, then the object will not respond to the high power signal. If the object is a wireless power receiver, then the wireless power receiver will wake up and send a response or packet to the wireless power transmitter. The wireless power transmitter can receive this response and determine that the object is a wireless power receiver.
  • the high power signal of digital ping can drain the transmitter battery quickly. Further, the specific amount of energy in the high power signal can sometimes overheat other metal in wireless power receivers.
  • the Hall effect sensor is a magnetic sensor that can be used for detecting the strength and direction of a magnetic field produced from a permanent magnet or an electromagnet with its output varying in proportion to the strength of the magnetic field being detected.
  • a Hall effect sensor can be attached or integrated to the wireless power transmitter in order for the wireless power transmitter to a presence of a wireless power receiver.
  • a transmitter of the wireless power transmitter needs to be disabled when using the Hall effect sensor in order to preserve power.
  • the Hall sensor can occupy circuit board space and incur extra cost.
  • transmitter 110 can be configured to determine whether objects being placed on charging region 152 is a foreign object or a wireless power receiver by detecting a presence of detection capacitor Cd in receiver 120.
  • Transmitter 110 can be configured to perform a frequency sweep for a range of frequencies that include the resonant frequency of detection capacitor Cd.
  • Transmitter 110 can analyze a phase response resulting from the frequency sweep to determine whether detection capacitor Cd is present or absent in charging region 152.
  • the frequency sweep can be performed periodically and continuously to monitor changes to charging region 152 and to detect whether a wireless power receiver is on charging region 152 or not.
  • transmitter 110 can differentiate foreign object from a wireless power receiver by detecting a presence of Cd. Further, transmitter 110 can perform the frequency sweep any time without a need to shut off transmitter 110. Furthermore, transmitter 110 can perform the frequency sweep with one or more conventional techniques to provide a multi-stage verification and detection of wireless power receiver.
  • Fig. 2A is a diagram showing an example implementation of receiver detection in wireless power transfer in one embodiment. Descriptions of Fig. 2A may reference components shown in Fig. 1.
  • controller 112 of transmitter 110 can generate control signals (e.g., pulse width modulation (PWM) signals) to control driver 114 to drive or stimulate the primary LC tank formed by coil TX and Cp.
  • Driver 114 can stimulate the primary LC tank by applying a sweep voltage V sweep using different frequencies ranging from frequency f 1 to frequency f 2 .
  • a resonant frequency f Cd can be greater than f 1 and less than f 2 . Note that the frequency range ⁇ f 1 : f 2 ⁇ does not include the resonant frequency of primary LC tank in transmitter 110 and secondary LC tank formed by coil RX and Cs in receiver 120.
  • Stimulating the primary LC tank can cause current (e.g., coil current I ac ) to flow through the primary LC tank, from a node AC1 to a node AC 2 via coil TX and Cp. If a foreign object is present on charging region 152, or if no object is present on charging region 152, a phase difference between a phase of I ac and a phase of a voltage difference V ac between nodes AC1, AC2 can be approximately minus 90 degree for the target range of frequency.
  • current e.g., coil current I ac
  • the coil current I ac of coil TX can experience phase change at the resonant frequency f Cd because the detection of capacitor Cd, being present on charging region 152, will react and resonate with the current I ac flowing through the primary LC tank at f Cd .
  • phase response 202 of the frequency sweep performed for frequency range ⁇ f 1 : f 2 ⁇ for both scenarios 1) coil being absent and 2) coil RX being present are shown.
  • Phase response 202 can show a relationship, such as a phase difference ⁇ between a phase of I ac ⁇ (I ac ) and a phase of V ac ⁇ (V ac ) for both scenarios.
  • Phase response 202 can show phase difference across the different frequencies in frequency range ⁇ f 1 : f 2 ⁇ .
  • phase difference between I ac and V ac , or ⁇ can be -90 or close to -90.
  • the phase difference between phases of I ac and V ac , or ⁇ can drop.
  • the phase drop at the resonant frequency f Cd of detection capacitor Cd can cause ⁇ (when RX present) to generate a peak 204.
  • the phase difference or ⁇ when RX is present, can change from approximately -90 degrees to approximately -36 degrees (e.g., change towards zero indicates a phase drop at AC2) .
  • Controller 112 can analyze phase response 202 and determine whether there is a peak in the current at node AC2 in phase response 202.
  • An absence of a peak in the phase difference or ⁇ can indicate that there is no object resonating at f Cd .
  • a presence of a peak in the phase difference or ⁇ at a specific frequency can indicate that an object is in charging region 152 and the object resonates at the specific frequency.
  • peak 204 can occur on or around f Cd in phase response 202.
  • controller 112 can determine that an object on charging region 152 resonates at f Cd , where the object can be detection capacitor Cp of receiver 120. Therefore, by analyzing a phase response from a frequency sweep, transmitter 110 can detect a presence or absence of a detection capacitor of a wireless power receiver, or the wireless power receiver itself, on charging region 152.
  • controller 112 can detect whether the peak detected in the phase difference or ⁇ exceeds a phase drop threshold or not. If the peak does not exceed the phase drop threshold, controller 112 can determine that detector capacitor Cd is absent from charging region 152. If the peak exceeds the phase drop threshold, controller 112 can determine that detector capacitor Cd is present on charging region 152.
  • the phase drop threshold can be arbitrary and programmable in controller 112 in order to tune a sensitivity of the detection of Cd.
  • the voltage V sweep can be at a voltage level that is insufficient to wake up receiver 120, or insufficient to turn on rectifier 124. Therefore, the voltage V sweep can be chosen or programmable based on a load equivalent resistance Rleq of rectifier 124 that is parallel to Cd and across the nodes AC1’ and AC2’.
  • load equivalent resistance Rleq can exists even when rectifier 124 remains unawake (e.g., rectifier 124 can be fully turned off in ideal situations but not practically) .
  • a smaller V sweep can minimize Rleq but may increase the difficulty on resolution.
  • Rleq can function as a damping resistor.
  • a peak 220 in Fig. 2B can be smaller than peak 204, and a peak 222 in Fig. 2C can be smaller than peak 220. Therefore, the peak that may appear in a phase response around f Cd can be larger or more obvious as Rleq increases.
  • the values of f Cd and Rleq can be known to controller 112. Controller 112 can use the known values of f Cd and Rleq to determine V sweep .
  • Fig. 3 is a diagram showing an adaptive implementation of receiver detection in wireless power transfer in one embodiment. Descriptions of Fig. 3 may reference components shown in Fig. 1 to Fig. 2C.
  • controller 112 can adaptively perform different techniques, in addition to the frequency sweep, to detect wireless power receivers on charging region 152 based on a success rate and/or a power consumption. Controller 112 can monitor the success rate of detecting wireless power receivers and based on the success rate, determine which technique to use for detecting a presence of a wireless power receiver.
  • controller 112 can continuously monitor charging region 152 to determine whether a wireless power receiver is on charging region 152 or not. Controller 112 can log a success rate, such as logging instances where a wireless power receiver is detected correctly. Controller 112 can also log instances where an object is wrongly detected as a wireless power receiver. The success rate can be a ratio of instances where a wireless power receiver is detected correctly to instances where an object is wrongly detected as a wireless power receiver. If the success rate is below a predefined threshold, then controller 112 can perform one or more additional techniques in addition to the frequency sweep to detect wireless power receivers on charging region 152. In one embodiment, if the success rate is below a predefined threshold, then controller 112 can use a lower power technique such as Q factor detection, or schedule lower power techniques in between different instances of frequency sweeps.
  • a success rate such as logging instances where a wireless power receiver is detected correctly. Controller 112 can also log instances where an object is wrongly detected as a wireless power receiver. The success rate can be a ratio of instances where a wireless power
  • Controller 112 can also monitor a power consumption of transmitter 110. If the power consumption exceeds a predefined threshold, controller 112 can perform a low power technique such as Q factor detection in addition to frequency sweep to detect wireless power receivers on charging region 152. If the power consumption is less than the predefined threshold, controller 112 can perform a high power technique such as digital ping in addition to frequency sweep to detect wireless power receivers on charging region 152.
  • a low power technique such as Q factor detection in addition to frequency sweep to detect wireless power receivers on charging region 152. If the power consumption is less than the predefined threshold, controller 112 can perform a high power technique such as digital ping in addition to frequency sweep to detect wireless power receivers on charging region 152.
  • Controller 112 can be configured to perform process 300 to determine which techniques can be combined with the frequency sweep technique to detect Cd based on power consumption of transmitter 110 and/or success rate of wireless power receiver detection. Controller 112 can perform process 300 iteratively, and periodically (e.g., perform an N-th iteration at times T N ) .
  • Process 300 can begin at block 302.
  • Process 300 can proceed from block 302 to block 304.
  • controller 112 can perform a frequency sweep by providing V sweep to primary LC tank formed by coil TX and primary capacitor Cp. Controller 112 can analyze a phase response of the frequency sweep to determine whether a detection capacitor of a wireless receiver, such as Cd of receiver 120, is present on or absent from charging region 152.
  • the Cd detection performed in block 304 is described above in accordance with Fig. 2.
  • Process 300 can proceed from block 304 to block 306.
  • controller 112 can determine whether Cd was detected at block 304 or not. If Cd was not detected in block 304, process 300 can proceed to block 308.
  • controller 112 can log the failure to detect Cd in, for example, a memory device or a register of transmitter 110. If Cd was detected in block 304, process 300 can proceed to block 310.
  • controller 112 can log the successful detection of Cd in, for example, a memory device or a register of transmitter 110.
  • Process 300 can proceed from block 308 and/or block 310 to block 312.
  • controller 112 can determine and/or update a success rate.
  • the success rate being updated at block 312 can be a success rate of detecting Cd on charging region 152.
  • the success rate can be a ratio of the number of successful detections logged at block 310 to the number of failed detections logged at block 308.
  • the success rate can be a percentage determined by dividing the number of successful detections logged in block 310 by N.
  • Process 300 can proceed from block 312 to block 314.
  • controller 112 can compare the success rate updated at block 312 with a predefined success rate threshold S TH .
  • the predefined success rate threshold S TH can be arbitrary and programmable. If the success rate is greater than or equal to S TH , process 300 can proceed to block 316. If the success rate is less than S TH , process 300 can proceed to block 318.
  • controller 112 can increment the iteration index N by one.
  • Process 300 can proceed from block 316 to block 304, and blocks 304, 306, 3088 or 310, 312 and 314 can be repeated until process 300 proceeds from block 314 to block 318, or until the success rate is less than S TH .
  • controller 112 can compare a power consumption of transmitter 110 with a predefined power consumption threshold P TH . If the power consumption is greater than or equal to P TH , process 300 can proceed to block 320. If the success rate is less than P TH , process 300 can proceed to block 316. At block 320, controller 112 can combine a low power technique with the frequency sweep Cd detection at block 304. The combination at block 320 will be described in more detail on accordance with Fig. 4.
  • process 300 can perform block 322 where controller can perform a high power technique, such as digital ping described above, as an alternative to Cd detection. Also optionally, if Cd is detected at block 306, process 300 can proceed to block 318 to check power consumption of transmitter 110. If Cd is detected at block 306 and power consumption is less than P TH , controller 112 can perform block 322 to use a high power technique, such as digital ping, to further verify the result of the Cd detection (e.g., to verify that a presence of a wireless power receiver) .
  • a high power technique such as digital ping described above
  • the process 300 can allow controller 112 to adaptively determine whether additional techniques shall be used and/or combined with the Cd detection at block 304. If a success rate of Cd detection is relatively low and transmitter is consuming relatively large amount of power, controller 112 can use a low power technique to preserve power since using Cd detection alone with a low success rate may cause transmitter 110 to consume unnecessary power. On the other hand, if a success rate of Cd detection is relatively low and transmitter is consuming relatively less power, controller 112 can continue to use the frequency sweep to detect Cd.
  • Fig. 4 is a diagram showing a combination of a high power technique with receiver detection in wireless power transfer in one embodiment. Descriptions of Fig. 4 may reference components shown in Fig. 1 to Fig. 3.
  • controller 112 can be configured to perform a low power technique, such as Q factor detection, before performing Cd detection.
  • controller 112 can be configured to perform the Q factor detection to detect whether there is an object with a Q factor on charging region 152. If controller 112 determines that no object with Q factor is present on charging region 152, controller 112 can continue to monitor charging region 152 without performing frequency sweep.
  • controller 112 can perform frequency sweep to verify whether the object includes Cd or not. If Cd is not detected, then controller 112 can determine that the object with the Q factor is a foreign object. If Cd is detected, then controller 112 can determine that the object with the Q factor is a wireless power receiver. In response to Cd being detected, controller 112 can further verify whether a wireless power receiver is present or absent on charging region by performing a high power technique such as digital ping. In one embodiment, controller 112 can be configured to perform a combination of Cd detection and digital ping without Q factor detection.
  • the order of performing Q factor detection, Cd detection, then digital ping can preserve power consumption for transmitter 110.
  • Digital ping may not need to be performed if no Cd is detected, thus preserving power consumption.
  • the insertion of Cd detection can minimize a number of times of digital ping being performed by controller 112.
  • controller 112. By way of example, if Cd detection is not performed before digital ping, then transmitter 110 can perform digital ping N times regardless of how many times a wireless power receiver is detected by digital ping out of the N times. However, if Cd detection is performed before digital ping, then transmitter 110 can perform Cd detection N times, and if Cd is detected X out of N times, then transmitter 110 can perform digital ping X times instead of N times, thus preserving power.
  • Process 400 can be an example of a combination of low power technique, such as Q factor detection, and high power technique, such as digital ping, with Cd detection using frequency sweep.
  • Process 400 can proceed from block 402 to block 404.
  • controller 112 can perform a low power technique, such as Q factor detection described above.
  • Low power technique performed in block 404 can be a technique that consumes less power than the frequency sweep Cd detection described herein.
  • Process 400 can proceed from block 404 to block 406.
  • controller 112 can determine whether an object is present or absent on charging region 152. If a result of the Q factor detection indicates no Q factor is detected, then process 400 can proceed to block 410. No Q factor being detected can indicate that there is no object on charging region 152, or an object on charging region 152 does not include metal, hence no wireless power receiver is on charging region 152. If a result of the Q factor detection indicates a Q factor is detected, then process 400 can proceed to block 408.
  • controller 112 can perform a frequency sweep by providing V sweep to primary LC tank formed by coil TX and primary capacitor Cp. Controller 112 can analyze a phase response of the frequency sweep to determine whether a detection capacitor of a wireless receiver, such as Cd of receiver 120, is present on or absent from charging region 152.
  • the Cd detection performed in block 408 is described above in accordance with Fig. 2.
  • Process 400 can proceed from block 408 to block 412.
  • controller 112 can determine whether Cd was detected at block 408 or not. If Cd was not detected in block 408, process 400 can proceed to block 414.
  • controller 112 can log the failure to detect Cd in, for example, a memory device or a register of transmitter 110.
  • Process 400 can proceed from block 414 to block 410. If Cd was detected in block 408, process 400 can proceed to block 416.
  • controller 112 can perform a high power technique such as digital ping to verify a wireless power receiver is present on charging region 152.
  • Process 400 can proceed from block 416 to block 418.
  • controller 112 can determine whether the high power technique performed in block 416 successfully detected or communicated with a wireless power receiver or not. If controller 112 fails to detect or communicate with a wireless power receiver at block 416, process 400 can proceed to block 410. If controller 112 successfully detected or communicated with a wireless power receiver at block 416, process 400 can proceed to block 420. At block 420, in response to the success in detecting or communicating with a wireless power receiver at block 416, transmitter 110 can perform wireless power transfer with the detected wireless power receiver.
  • the usage of the frequency sweep for detecting Cd can provide various benefits.
  • the Cd detection can consume less power when compared with digital ping, but can also provide a higher success rate than Q factor detection.
  • the frequency sweep for Cd detection does not require additional components.
  • the frequency sweep for Cd detection can be performed without a need to shut off transmitter 110.
  • Fig. 5 is a flow diagram illustrating a process of implementing receiver detection in wireless power transfer in one embodiment.
  • the process 500 may include one or more operations, actions, or functions as illustrated by one or more of blocks 502 and/or 504. Although illustrated as discrete blocks, various blocks can be divided into additional blocks, combined into fewer blocks, eliminated, or performed in parallel, and/or performed in different order, depending on the desired implementation.
  • Process 500 can be performed by a wireless power transmitter in a wireless power transfer system (e.g., transmitter 110 in Fig. 1) .
  • Process 500 can begin at block 502 .
  • a controller of the wireless power transmitter can perform a frequency sweep on a transmitter coil of a wireless power transmitter at a plurality of frequencies.
  • the plurality of frequencies can include a resonant frequency of a detection capacitor parallel to a receiver coil in a wireless power receiver.
  • the controller can perform the frequency sweep by providing a voltage to the transmitter coil.
  • the voltage can be based on a load equivalent resistance of a rectifier of the wireless power receiver.
  • Process 500 can proceed from block 502 to block 504.
  • the controller can determine whether the wireless power receiver is present or absent on a charging region of the wireless power transmitter based on a phase response of the frequency sweep.
  • the controller can detect an absence of phase drop at the resonant frequency of the detection capacitor in the phase response. In response to detecting the absence of phase drop, the controller can determine that the wireless power receiver is absent on the charging region. The controller can detect a presence of a phase drop at the resonant frequency of the detection capacitor in the phase response. In response to detecting the presence of the phase drop, the controller can determine that the wireless power receiver is present on the charging region;
  • the controller can detect a presence of a Q factor of an object on the charging region.
  • the controller can perform the frequency sweep in response to detecting the presence of the Q factor.
  • the controller can perform the frequency sweep periodically.
  • the controller can determine a success rate of detecting the wireless power receiver on the charging region based on the phase response of the frequency sweep. In response to the success rate being greater than a predefined threshold, the controller can continue performing the frequency sweep periodically. In response to the success rate being less than a predefined threshold, the controller can perform a Q factor detection to detect a presence or absence of an object on the charging region. In response to detection of the presence of the object on the charging region, the controller can perform the frequency sweep.
  • each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function (s) .
  • the functions noted in the blocks may occur out of the order noted in the Figures.
  • two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Des systèmes et des procédés pour des systèmes de transfert d'énergie sans fil sont décrits. Un émetteur d'énergie sans fil peut être configuré pour effectuer un balayage de fréquence sur une bobine émettrice de l'émetteur d'énergie sans fil à une pluralité de fréquences. La pluralité de fréquences peut comprendre une fréquence de résonance d'un condensateur de détection parallèle à une bobine de récepteur dans un récepteur d'énergie sans fil. L'émetteur d'énergie sans fil peut être configuré pour déterminer si le récepteur d'énergie sans fil est présent ou absent sur une région de charge connectée à l'émetteur d'énergie sans fil sur la base d'une réponse de phase du balayage de fréquence.
PCT/CN2023/130193 2023-11-07 2023-11-07 Détection de récepteur dans un transfert d'énergie sans fil Pending WO2025097301A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2023/130193 WO2025097301A1 (fr) 2023-11-07 2023-11-07 Détection de récepteur dans un transfert d'énergie sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2023/130193 WO2025097301A1 (fr) 2023-11-07 2023-11-07 Détection de récepteur dans un transfert d'énergie sans fil

Publications (1)

Publication Number Publication Date
WO2025097301A1 true WO2025097301A1 (fr) 2025-05-15

Family

ID=95694787

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/130193 Pending WO2025097301A1 (fr) 2023-11-07 2023-11-07 Détection de récepteur dans un transfert d'énergie sans fil

Country Status (1)

Country Link
WO (1) WO2025097301A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016076733A1 (fr) * 2014-11-11 2016-05-19 Powerbyproxi Limited Émetteur de puissance inductive
WO2019074946A1 (fr) * 2017-10-09 2019-04-18 Integrated Device Technology, Inc. Mesure de facteur q
CN114448109A (zh) * 2022-01-27 2022-05-06 广东美芝制冷设备有限公司 无线充电器及其异物检测方法、装置及存储介质

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016076733A1 (fr) * 2014-11-11 2016-05-19 Powerbyproxi Limited Émetteur de puissance inductive
WO2019074946A1 (fr) * 2017-10-09 2019-04-18 Integrated Device Technology, Inc. Mesure de facteur q
CN114448109A (zh) * 2022-01-27 2022-05-06 广东美芝制冷设备有限公司 无线充电器及其异物检测方法、装置及存储介质

Similar Documents

Publication Publication Date Title
US10305327B2 (en) Power transmitting device and wireless power transmission system
US9787364B2 (en) Multi-use wireless power and data system
EP3185262B1 (fr) Procédé, appareil et système de transfert de puissance sans fil
US10299095B2 (en) Wireless load modulation
US10686334B2 (en) Wireless power transmission apparatus and control method for the same
US10170942B2 (en) Power receiving device and wireless power transmission system
US20180069441A1 (en) Wireless power transmission apparatus and wireless power transmission system
EP3364521A1 (fr) Système de transfert d'énergie sans fil et son procédé d'excitation
JP2017070074A (ja) ワイヤレス送電装置、その制御回路、充電器、およびパワーロスメソッドによる異物検出のキャリブレーション方法
EP3343732A1 (fr) Système de transmission d'énergie sans fil et son procédé d'entraînement
US20160226311A1 (en) Power transmission device, power transmission and receiving device, method for detecting power receiving device, power receiving device detection program, and semiconductor device
US20130020879A1 (en) Power transmission device and waveform monitor circuit for use in power transmission device
JP2018078699A (ja) ワイヤレス受電装置およびその制御方法、受電制御回路、電子機器
CN104242377A (zh) 非接触充电系统和非接触充电方法
WO2025097301A1 (fr) Détection de récepteur dans un transfert d'énergie sans fil
US9641010B2 (en) Charger and electronic apparatus stably supplying operating voltage
US11936200B2 (en) Wireless power supply system
US10608474B2 (en) Wireless power system with power management
KR101996966B1 (ko) 무전전력전송 시스템 및 이의 구동 방법.
US10705130B2 (en) Adaptive transmitter present detection
EP3876389A1 (fr) Résonance dynamique pour systèmes d'alimentation sans fil
US12388374B2 (en) Real-time misfire detection
KR20160080499A (ko) 무선 전력 송신 장치 및 이를 포함하는 무선충전 시스템
US12206253B2 (en) Voltage doubler in wireless power application
US20240429754A1 (en) Foreign object detection based on transmitter input parameter

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23957912

Country of ref document: EP

Kind code of ref document: A1