KR20190065744A - Coil For Wireless Charging - Google Patents

Abstract

The coil assembly includes a substrate and a coil disposed on one surface of the substrate, wherein the substrate includes a shielding plate having a diameter of 90 mm with an error range of +/- 1.2 mm and a thickness of 3.0 mm or less with an error range of +/- 0.15 mm or less, 0.7 mm wire is wound in three layers and the inner side has a diameter of 60 mm with an error range of ± 0.5 mm and an outer side with a diameter of 77 mm with an error range of ± 2 mm or less and a diameter of 2.1 mm with an error range of ± 0.15 mm or less And the coil is wound with a total of 40 turns when the coil is wound with 13 or more turns for each layer of 3 layers and the coil is operated within the frequency range of 130 to 150 kHz and the error range is ± 10% With an inductance of 330 uH, it is possible to transmit radio power signals in the range of 20W to 100W.

Description

{Coil For Wireless Charging}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless charging technique, and in detail, to provide a wireless charging coil and a wireless power transmitter or receiver equipped with the same.

The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer And thereafter, a method of radiating electromagnetic waves such as radio waves, lasers, high frequencies, and microwaves to transfer electrical energy has also been attempted. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

Up to the present, 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.

In 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. As a technology, . 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.

Short wavelength wireless power transmission - simply, 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 used in various fields such as automobile, IT, railroad, home appliance industry as well as mobile.

Wireless charging can increase the temperature of the charged surface during transmission of power to the primary coil, which is the transmit coil, and the secondary coil, which is the receive coil, during power transfer. At this time, when a temperature higher than a reference value is detected, the wireless power transmission apparatus should stop the power transmission until the temperature becomes normal. Recently, there is a demand for a method of reducing the heat generated in the primary coil and the secondary coil as the power transmitted between the primary coil and the secondary coil increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and it is an object of the present invention to provide a durable coil And a wireless power transmitter or receiver equipped with the same.

Further, the present invention can simplify the structure of a coil disposed in a power transmitter or a receiver, thereby improving productivity and mass productivity.

In addition, the present invention can increase the chargeable distance between the power transmitter and the power receiver to increase the degrees of freedom of charging, reduce the heat generation, protect the portable device, and prevent the danger that may occur during the charging process.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The present invention can provide a wireless charging coil assembly and a wireless power transmission device and a wireless power reception device equipped with the wireless charging coil assembly.

A coil assembly mounted on a wireless power transmission apparatus according to an embodiment of the present invention includes: a substrate; And a coil disposed on one surface of the substrate, wherein the substrate includes a shield plate having a diameter of 90 mm and an error range of +/- 0.1 mm or less and a thickness of 3.0 mm, the coil having a diameter of 0.7 mm Of the wire is wound in three layers and the inner side has a diameter of 60 mm with an error range of +/- 0.5 mm and an outer side with a diameter of 77 mm with an error range of +/- 2 mm or less and a circular ring having a thickness of 2.1 mm with an error range of +/- 0.15 mm or less And the coil is wound with a total of 40 turns by winding the wire 13 times or more in each layer of the three layers in the coil. When the coil operates in the frequency range of 130 to 150 kHz, the error range is ± 10 With an inductance of 330 uH of%, it is possible to transmit a radio power signal in the range of 20W to 100W.

Further, the substrate may be a 0.05 mm thick PET film and a 0.1 mm thick adhesive layer disposed between the coil and the shielding plate; And the substrate may further include an adhesive layer having a thickness of 0.05 mm on the opposite side of the surface on which the coil is disposed in the shielding plate.

In addition, the coil includes a tape surrounding a portion of the annular bezel, and the tape may have a width of 5 mm with an error range of +/- 1 mm or less.

In addition, the coil assembly may transmit a radio power signal at a level of 60W.

Further, the shield plate may have a planar shape without protruding regions.

According to another aspect of the present invention, there is provided a coil assembly comprising: a substrate; And a coil disposed on one surface of the substrate, wherein the substrate includes a shield plate having a diameter of 90 mm and a tolerance of ± 0.15 mm or less and a thickness of 3.0 mm, the tolerance being within ± 1.2 mm, A wire of 1.3 mm or less of ± 0.15 mm or less is wound in a single layer and the inner side is wound on a circular shape having a diameter of 61.5 mm with an error range of ± 0.5 mm or less and an outer side with a diameter of 75.5 mm with an error range of ± 2 mm or less wherein the coil is wound six times with the inductor having an inductance of 8.6 uH with an error range of +/- 10% when operated in the frequency range of 130 to 150 kHz and an inductance in the range of 20 W to 100 W And may receive a wireless power signal.

Further, the substrate may be a 0.05 mm thick PET film and a 0.1 mm thick adhesive layer disposed between the coil and the shielding plate; And the substrate may further include an adhesive layer having a thickness of 0.05 mm on the opposite side of the surface on which the coil is disposed in the shielding plate.

In addition, the coil includes a tape surrounding a portion of the annular bezel, and the tape may have a width of 5 mm with an error range of +/- 1 mm or less.

In addition, the coil assembly may receive a radio power signal at a level of 60W.

Further, the shield plate may have a planar shape without protruding regions.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

Effects of the method and apparatus according to the present invention will be described as follows.

The present invention can improve the productivity by simplifying the structure of the coil and the structure of the shielding agent included in the coil assembly.

Further, the present invention is advantageous in that a maximum charging distance between a coil and a coil can be increased, and a wireless charging device capable of charging a plurality of devices through a plurality of coils can be provided.

Further, the present invention has the advantage of reducing the heat generated in the coils during the wireless charging process, increasing the durability of the charging device and the device to be charged, and reducing the risk of heat generation.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.
3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.
4 is a diagram illustrating a coil assembly for wireless power transmission according to an embodiment of the present invention.
5 is a view for explaining a coil assembly for wireless power reception according to an embodiment of the present invention.
6 is a view for explaining the effect of a coil assembly for wireless power transmission and reception according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiment, in the case where it is described as being formed "above" or "below" each element, the upper or lower (lower) And that at least one further component is formed and arranged between the two components. Also, in the case of "upper (upper) or lower (lower)", it may include not only the upward direction but also the downward direction based on one component.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmission device, a wireless power transmitter, and the like are used in combination. Also, 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 receiving apparatus, Etc. may be used in combination.

The transmitter according to the present invention may be configured as a pad, a cradle, an access point (AP), a small base station, a stand, a ceiling, a floor, And may transmit wireless power to the power receiving device. To this end, the transmitter may comprise at least one radio power transmission means. Here, the radio power transmission 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. As an example, the wireless power transmission means may include an electromagnetic induction wireless charging technique as defined in a wireless charging technology standard framework such as Wireless Power Consortium (WPC), AirFuel Alliance (AFA), and the like.

Also, a receiver according to an embodiment of the present invention may include at least one wireless power receiving means and may receive wireless power from two or more transmitters at the same time. Here, the wireless power receiving means may include, but is not limited to, an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC), AirFuel Alliance (AFA), and the like.

A wireless power receiver according to the present invention may be mounted on one side of a transportation device, but is not limited thereto, and may be a device equipped with wireless power receiving means according to the present invention to charge a battery.

1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.

Referring to FIG. 1, the wireless charging system includes a wireless power transmitter 10 for transmitting power wirelessly, a wireless power receiver 20 for receiving the transmitted power, and an electronic device 30 Lt; / RTI >

For example, 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. In another example, 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 .

For example, 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. Here, 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.

 For example, 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 >

In the half duplex communication mode, 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 according to an embodiment of the present invention may acquire various status information of the electronic device 30. [ For example, 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.

In particular, the wireless power transmitting terminal 10 according to an embodiment of the present invention 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.

Also, 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. In this case, 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.

2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.

For example, as shown in 200a, the wireless power receiving terminal 20 may include a plurality of wireless power receiving devices, and a plurality of wireless power receiving devices may be connected to one wireless power transmitting terminal 10, Charging may also be performed. At this time, the wireless power transmitting terminal 10 may transmit power to a plurality of wireless power receiving apparatuses in a time division manner, but is not limited thereto. In another example, the wireless power transmission terminal 10 can distribute and transmit power to a plurality of wireless power receiving apparatuses using different frequency bands allocated to the wireless power receiving apparatuses.

At this time, the number of wireless power receiving apparatuses connectable to one wireless power transmitting apparatus 10 is set to at least one of the required power amount for each wireless power receiving apparatus, the battery charging state, the power consumption amount of the electronic apparatus, Can be determined adaptively based on

As another example, as shown in 200b, the wireless power transmitting terminal 10 may be composed of a plurality of wireless power transmitting apparatuses. In this case, the wireless power receiving terminal 20 may be connected to a plurality of wireless power transmission apparatuses at the same time, and may simultaneously receive power from connected wireless power transmission apparatuses to perform charging. At this time, the number of wireless power transmission apparatuses connected to the wireless power receiving terminal 20 is adaptively set based on the required power amount of the wireless power receiving terminal 20, the battery charging status, the power consumption amount of the electronic apparatus, Can be determined.

3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.

As an example, the wireless power transmitter may be equipped with three transmit coils 111, 112, 113. Each of the transmission coils may be disposed such that a portion of the transmission coils overlaps with the other transmission coils. However, this is merely an example, and the transmission coils may be disposed without overlapping one another or with one transmission coil.

The wireless power transmitter sequentially transmits predetermined sensing signals 117, 127 (e.g., digital ping) for sensing the presence of a wireless power receiver through each of the transmit coils in a predefined order.

3, the wireless power transmitter sequentially transmits a sense signal 117 when the primary sense signal transmission procedure shown at reference numeral 110 is started, and transmits a predetermined response signal - For example, a signal strength indicator 116 or a signal strength packet may be referred to as a signal strength indicator for convenience of explanation. The received transmission coils 111 and 112 can be identified. Subsequently, the wireless power transmitter sequentially transmits the sense signal 127 when the secondary sense signal transmission procedure shown at 120 is started, and when the signal strength indicator 126 indicates that the power of the transmit coils 111 and 112 It is possible to control the transmission efficiency (or charging efficiency) - that is, the alignment state between the transmission coil and the reception coil - to identify a good transmission coil and to allow power to be transmitted through the identified transmission coil, have.

As shown in FIG. 3, the reason why the wireless power transmitter performs 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.

If 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 aforementioned numerals 110 and 120 of FIG. 3, 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 .

Hereinafter, the structure of the coil assembly included in the wireless power transmitter and the wireless power receiver will be described with reference to FIGS. 4 and 5. FIG. Current wireless power transceivers are transmitting and receiving 5W of power wirelessly. However, in order to shorten the charging time, efforts are being made to wirelessly transmit and receive a power of 5W to 15W level. In addition, it is necessary to prepare for wireless transmission and reception of 20W ~ 100W power in the future. For example, in order to transmit / receive a power of 60W level, there is a problem of charging efficiency, heat generation and safety because it is difficult to apply the power of 5W ~ 15W level. Therefore, it is necessary to propose a new type of transceiver . Accordingly, the wireless power transmitter and the wireless power receiver according to the embodiment propose a structure capable of transmitting and receiving a power of 20W to 100W level, for example, a power level of 60W. For convenience of explanation, FIGS. 4 and 5 illustrate a coil assembly including one coil as an example. As illustrated in FIG. 3, the wireless power transmitter and the wireless power receiver may include a coil assembly comprised of a plurality of coils.

4 is a diagram illustrating a coil assembly for wireless power transmission according to an embodiment of the present invention.

As shown, the coil assembly may include a substrate 320 and a coil 302 disposed on one side of the substrate 320, which may be mounted on a wireless power transmission device. Here, the substrate 320 may mean a structure for arranging the coils. More specifically, the substrate 320 may include a shield plate 308 having a diameter (TC) of 90 mm and an error range of ± 0.1 mm or less and a 3.0 mm thickness (TH) of an error range of about 1.2 mm or less.

The coil 302 in the coil assembly is formed by winding a wire having a thickness of about 0.7 mm in three layers and having an inner diameter of 60 mm (TA) with an error range of ± 0.5 mm or less and an outer diameter of And a toroidal having a 77 mm diameter (TB) with an error range of ± 2 mm or less and a 2.1 mm thickness (TL) with an error range of ± 0.15 mm or less. Here, the ring-shaped body may include a ring or donut-shaped cube. Here, the wire is composed of a conductor of 16 strands having a thickness of 0.12 mm.

In the coil 302, the wire is wound 13 times (turns) or more for each layer of the three layers. In addition, the coil 302 can transmit a radio power signal having a frequency range of 130 to 150 kHz. For example, for each layer of the three layers of the coil 302, the number of turn turns of the wire can be 13.3 turns (13.3 turns).

The substrate 320 may further include a 0.05 mm thick (TI) PET film 306 and a 0.1 mm thick (TJ) adhesive layer 304 disposed between the coil 302 and the shielding plate 308.

The substrate 320 may further include an adhesive layer 310 having a thickness of 0.05 mm on the opposite side of the surface on which the coil 302 is disposed with respect to the shielding plate 308.

4 illustrates a structure in which the PET film 306 is disposed on one side of the shielding plate 308 and the adhesive layer 310 is disposed on the opposite side of the shielding plate 308. However, . Here, both the PET film 306 and the adhesive layer 310 can be disposed inside the edge of the shielding plate 308 without deviating from the area of the shielding plate 308.

Here, the PET film 306 may include polyethylene terephthalate (PET), and a saturated polyester obtained by polycondensing terephtal with ethylene glycol. Here, PET has a structure in which the length of the molecular ring is shorter than that of polybutylene terephthalate and does not bend well, so that it is not only resistant to electric arc but also can prevent cracks.

The coil 302 may include a tape 312 surrounding a portion of the annular bezel. Here, the tape 312 may have a 5 mm width (TD) with an error range of +/- 1 mm or less. Also, the tape 312 may be yellow.

On the other hand, in the coil 302, 13.3 turns (13.3 turns) of wire are wound for each layer, and the wires are wound 40 times in total over 3 layers. The coil 302 may have an inrush of 330 uH with an error range of +/- 10% when transmitting in a frequency band of 130 to 150 KHz (e.g., 145 KHz).

Further, the shielding plate 308 may have a planar shape without protruding regions. Further, the shielding plate 308 may have a single plane and may have a structural shape that is not divided into several parts.

According to the embodiment, two lead wires 314 and 316 may protrude from the coil 302. The distance TE between the positions at which the two lead wires 314 and 316 protrude may be 8 mm with an error range of +/- 1.5 mm or less. Further, the length TF of the two lead wires 314 and 316 may be 80 mm, which is an error range of ± 2 mm or less. Although not shown, a 5 mm soldering area having an error range of +/- 1 mm or less may be included at the ends of the two lead lines 314 and 316.

According to an embodiment, the combined thickness of the coils 302 to 320 may be less than or equal to 5.6 mm.

5 is a view for explaining a coil assembly for wireless power reception according to an embodiment of the present invention.

As shown, the coil assembly may include a substrate 420 and a coil 402 disposed on one side of the substrate 420, which may be mounted on a wireless power transmission device. Here, the substrate 420 may mean a structure for arranging the coils. More specifically, the substrate 420 may include a shield plate 408 having a diameter (TC) of 90 mm and an error range of +/- 0.1 mm or less and a 3.0 mm thickness (RH) of an error range of about 1.2 mm or less.

The coil 402 in the coil assembly is formed by winding a wire having a thickness of about 0.7 mm into a single layer and having an inner diameter of 60 mm (RA) with an error range of 0.5 mm or less, May be composed of a toroidal having a 77 mm diameter (RB) with an error range of +/- 2 mm or less and a 2.1 mm thickness (RL) with an error range of +/- 0.15 mm or less. Here, the ring-shaped body may include a ring or donut-shaped cube. Here, the wire is composed of 30 strands of wires having a thickness of 0.16 mm.

In the coil 402, the wire may be wound 6 times (turn, turn) on the single layer. In addition, the coil 402 may receive a wireless power signal having a frequency range of 130 to 150 kHz.

The substrate 420 may further include a 0.05 mm thick RI PET film 406 and a 0.1 mm thick RJ adhesive layer 404 disposed between the coil 402 and the shielding plate 408.

The substrate 420 may further include an adhesive layer 410 having a thickness of 0.05 mm on the opposite side of the surface on which the coil 402 is disposed with respect to the shielding plate 408.

4 illustrates the structure in which the PET film 406 is disposed on one side of the shielding plate 408 and the adhesive layer 410 is disposed on the opposite side of the shielding plate 408. However, . Here, both the PET film 406 and the adhesive layer 410 can not have a size deviating from the area of the shielding plate 408 and can be disposed inside the edge of the shielding plate 408.

Here, the PET film 406 may include a polyethylene terephthalate (PET), and a saturated polyester obtained by polycondensing terephtal with ethylene glycol. Here, PET has a structure in which the length of the molecular ring is shorter than that of polybutylene terephthalate and does not bend well, so that it is not only resistant to electric arc but also can prevent cracks.

The coil 402 may include a tape 412 surrounding a portion of the annular bezel. Here, the tape 412 may have a 5 mm width (TD) with an error range of +/- 1 mm or less. Also, the tape 412 may be yellow.

Meanwhile, the coil 402 may have an inductance of 8.6 uH having an error range of 10% when transmitting in a frequency band of 130 to 150 KHz (for example, 145 KHz).

Further, the shielding plate 408 may have a planar shape without protruding regions. Further, the shielding plate 408 may have a single plane and may have a structural shape that is not divided into several parts.

According to the embodiment, two lead wires 414 and 416 can be protruded from the coil 402. The distance RE between the positions at which the two lead wires 414 and 416 protrude may be 8 mm with an error range of +/- 1.5 mm or less. In addition, the length (RF) of the two lead wires 414 and 416 may be 80 mm, which is an error range of +/- 2 mm or less. Although not shown, the ends of the two lead wires 414 and 416 may include a soldering area of 5 mm in an error range of +/- 1 mm or less.

According to an embodiment, the combined thickness of the coils 402 to the substrate 420 may be 4.8 mm or less.

6 is a view for explaining the effect of a coil assembly for wireless power transmission and reception according to an embodiment of the present invention. Specifically, the equivalent circuit of the wireless charging transmitter and the wireless charging receiver to which the coil assembly described with reference to FIGS. 4 and 5 is applied has been described, and the electromagnetic characteristics that vary according to the distance (Coil to Coil Gap) Respectively.

As shown, there is a mutual inductance M even if the distance (Coil to Coil Gap) between the wireless charging transmitter and the wireless charging receiver changes, which means that wireless charging is efficiently performed between the wireless charging transmitter and the wireless charging receiver It can mean that it is possible. Although the value of the mutual inductance (M) is lowered as the distance (Coil to Coil Gap) between the wireless charging transmitter and the wireless charging receiver is getting smaller, there is no problem that the wireless charging is progressed to the interval of 14 mm.

Through the above-described embodiments, it is possible to use a planar shielding plate, thereby enhancing the productivity of the coil assembly included in the wireless charging transmitter and the wireless charging receiver.

Further, even if the distance (Coil to Coil Gap) between the wireless charging transmitter and the wireless charging receiver is increased to 14 mm, there is no problem in performing charging, so that the degree of freedom of charging can be increased. In particular, wireless charging can be performed even if the coil assemblies of the wireless charging transmitter and the wireless charging receiver are not aligned and spaced 5 mm to 10 mm from the center.

Meanwhile, since the coil assembly included in the wireless charging transmitter and the wireless charging receiver does not include a complicated structure having a special shape such as a curved surface or a step, mass production of the coil assembly can be enhanced.

In addition, when wireless charging is performed through the wireless charging transmitter and the wireless charging receiver to which the coil assembly described with reference to FIGS. 4 and 5 is applied, the heat generation can be reduced compared to the conventional 15 Watt wireless charging coil. In the conventional 15 Watt class wireless charging coil, a temperature of about 60 to 70 degrees is formed, while a 30 to 40 degree temperature can be formed in a 60 Watt wireless charging process using the coil assembly described with reference to FIG. 4 and FIG.

Meanwhile, in the wireless charging transmitter to which the coil assembly described with reference to FIGS. 4 and 5 is applied, an AC power source of 220 V rather than a DC power source of 12 V to 19 V can be used, so that the power efficiency of wireless charging can be increased.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (10)

Board; And
And a coil disposed on one surface of the substrate,
The substrate includes a shielding plate having a diameter of 90 mm with an error range of +/- 1.2 mm and a thickness of 3.0 mm or less with an error range of +/- 0.15 mm or less,
The coil has a diameter of 60 mm with a tolerance of ± 0.5 mm on the inner side and a diameter of 77 mm on the outer side with an error range of ± 2 mm and a thickness of 2.1 mm with an error range of ± 0.15 mm or less (Toroidal) having a substantially rectangular shape,
Wherein the wire is wound on the coil at least thirteen times for each layer of the three layers,
The coil has an inductance of 330 uH with an error range of +/- 10% when operating in the frequency range of 130 to 150 kHz,
And transmits a wireless power signal in the range of 20W to 100W. The method according to claim 1,
The substrate
A 0.05 mm thick PET film and a 0.1 mm thick adhesive layer disposed between the coil and the shielding plate; And
Wherein the substrate further comprises an adhesive layer having a thickness of 0.05 mm on the opposite side of the side on which the coil is disposed in the shielding plate. The method according to claim 1,
Wherein the coil includes a tape surrounding a portion of the annular bezel,
Wherein the tape has a width of 5 mm with an error range of +/- 1 mm or less. The method according to claim 1,
Wherein the coil assembly is wound with a coil that transmits a radio power signal of 60W. The method according to claim 1,
Wherein the shield plate has a planar shape without protruding regions. Board; And
And a coil disposed on one surface of the substrate,
The substrate includes a shielding plate having a diameter of 90 mm with an error range of +/- 1.2 mm and a thickness of 3.0 mm or less with an error range of +/- 0.15 mm or less,
The coil is wound in a single layer of a wire of 1.3 mm in an error range of ± 0.15 mm or less to form a flat surface, and the inner side has a diameter of 61.5 mm with an error range of ± 0.5 mm or less and an outer side with a diameter of 75.5 mm Ring-shaped (toroidal)
The wire is wound six times on the coil,
The coil has an inductance of 8.6 uH with an error range of +/- 10% when operating in the frequency range of 130 to 150 kHz,
Wherein the coil assembly receives a wireless power signal in the range of 20W to 100W. The method according to claim 6,
The substrate
A 0.05 mm thick PET film and a 0.1 mm thick adhesive layer disposed between the coil and the shielding plate; And
Wherein the substrate further comprises an adhesive layer having a thickness of 0.05 mm on the opposite side of the side on which the coil is disposed in the shielding plate. The method according to claim 6,
Wherein the coil includes a tape surrounding a portion of the annular bezel,
Wherein the tape has a width of 5 mm with an error range of +/- 1 mm or less. The method according to claim 1,
Wherein the coil assembly receives a radio power signal of 60W. The method according to claim 6,
Wherein the shield plate has a planar shape without protruding regions.

Images