WO2019231168A1

WO2019231168A1 - Wireless charging coil

Info

Publication number: WO2019231168A1
Application number: PCT/KR2019/006173
Authority: WO
Inventors: 이기민; 김진복; 김형래; 임수찬
Original assignee: 엘지이노텍 주식회사
Priority date: 2018-05-30
Filing date: 2019-05-23
Publication date: 2019-12-05

Abstract

A wireless charging coil comprises: a first terminal; a winding part connected to the first terminal and including a first divided region; and a second terminal connected to the winding part. The first terminal does not overlap an imaginary straight line passing through the center of the winding part and the second terminal.

Description

Wireless charging coil

An embodiment relates to a wireless charging coil.

Portable terminals such as mobile phones and laptops include a battery that stores power and circuits for charging and discharging the battery. In order for the battery of the terminal to be charged, power must be supplied from an external charger.

In general, as an example of an electrical connection method between a charging device and a battery for charging power to a battery, the terminal is supplied with commercial power and converted into a voltage and a current corresponding to the battery to supply electrical energy to the battery through the terminal of the battery. Supply method. This terminal supply method is accompanied by the use of a physical cable (cable) or wire. Therefore, when handling a lot of terminal supply equipment, many cables occupy considerable working space, are difficult to organize, and are not good in appearance. In addition, the terminal supply method may cause problems such as instantaneous discharge phenomenon due to different potential difference between the terminals, burnout and fire caused by foreign substances, natural discharge, deterioration of battery life and performance.

Recently, in order to solve this problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly have been proposed. In addition, the wireless charging system was not basically installed in some portable terminals in the past, and the consumer had to separately purchase a wireless charging receiver accessory, so the demand for the wireless charging system was low, but wireless charging users are expected to increase rapidly. It is expected to be equipped with wireless charging function.

As the battery for wireless charging becomes larger, the quality factor becomes important. In general, in order to increase the wireless charging efficiency, the quality factor should also be high.

The quality factor Q is proportional to the inductance L and inversely proportional to the resistance R, as shown in equation (1).

To increase inductance, the length of the antenna, i.e. the total length of the coil, must be long.

However, since a large number of components have to be mounted in an electronic device such as, for example, a smartphone, there is a limitation in the size of the reception antenna. Therefore, there is a limit to increasing the inductance at the size set in this way.

In addition, if the length of the antenna is increased or the number of turns (the number of windings) of the coil is increased to increase the inductance, the resistance is also increased, so that it is difficult to increase the quality factor.

On the other hand, since the wireless charging receiving antenna actually operates when AC current flows, the AC resistance is not related to the DC resistance. The AC resistance at this time can be expressed as Equation 2.

R _ac represents the AC resistance, R _dc represents the DC resistance, Ys represents the resistance component due to the skin effect, and Yp represents the resistance component due to the proximity effect.

The skin effect refers to a phenomenon in which the AC current does not flow evenly in the cross section of the coil in which the AC current flows, and the AC current flows in the periphery area with little or no AC current flowing at all. This epidermal effect becomes more severe at higher frequencies. As shown in FIG. 1A, when an alternating current flows through the coil 1, the current density J is distributed at the periphery of the coil 1 and not at the center of the coil 1, so that the alternating current is applied to the coil 1. Does not flow to the center of the flow, but only flows to the periphery of the coil (1).

Proximity effect refers to a phenomenon in which the current density flowing in a coil is concentrated to one side when an AC current flows in adjacent coils. This proximity effect is exacerbated as the frequency increases and the spacing between adjacent coils narrows. As shown in FIG. 1B, when an alternating current flows through the

coils

3 and 5 adjacent to each other, the current density J of each

coil

3 and 5 is distributed in an area far from each other and is not distributed in an area adjacent to each other. do. As described above, when an alternating current flows in the

coils

3 and 5 adjacent to each other, the

coils

3 and 5 are affected by not only the skin effect but also the proximity effect.

When the spacing between coils is reduced to increase the inductance in the limited space, the AC resistance is increased due to the resistance component (Ys) due to the skin effect and the resistance component (Yp) due to the proximity effect.

In particular, when a shielding material is added for shielding the electromagnetic field of the antenna, this AC resistance is further increased.

Conventionally, in reducing the AC resistance of the wireless charging coil, the coil design was neglected while overlooking the effect of the skin effect and the proximity effect, and thus the cause of the increase of the AC resistance was not understood.

Therefore, the gap between the coils has not been reduced to increase the inductance, and even though the gap between the coils is reduced, the AC resistance is increased and the quality factor is rather low.

As described above, since the quality factor and the AC resistance are affected not only by the inductance but also various parameters such as the skin effect and the proximity effect which are directly related to the AC resistance, conventionally, the optimal wireless charging coil for improving the quality coefficient by reducing the AC resistance The design was difficult. In particular, there is a limit in improving the quality factor in consideration of the length or area of the coil in the conventional limited area.

The embodiment provides a wireless charging coil having a new structure.

The embodiment provides a wireless charging coil capable of suppressing an increase in AC resistance.

The embodiment provides a wireless charging coil that can increase the quality factor in a limited area.

The embodiment provides a wireless charging coil capable of minimizing the occupied area of the coil.

The embodiment provides a wireless charging coil capable of suppressing the generation of the phase difference.

The embodiment provides a wireless charging coil capable of an optimal design that can improve the quality factor.

The embodiment provides a wireless charging coil that can reduce the skin resistance to reduce the AC resistance.

The embodiment provides a wireless charging coil capable of reducing the AC resistance by reducing the proximity effect.

The embodiment provides a wireless charging coil that can reduce the AC resistance.

The embodiment provides a wireless charging coil that can improve the charging efficiency.

According to an aspect of the embodiment to achieve the above or another object, the wireless charging coil, the first terminal; A winding part connected to the first terminal and including a first division region; And a second terminal connected to the winding part. The first terminal does not overlap an imaginary straight line passing through the center of the winding portion and the second terminal.

The winding part may include a second divided region and a non-divided region between the first divided region and the second divided region.

At least one of the first terminal and the second terminal may not overlap an imaginary straight line passing through the center of the winding part and the non-divided area.

The first divided area may be divided into two conductive lines.

The second divided area may be divided into three conductive lines.

The two conductive wires of the first divided area are commonly connected to the first terminal, the two conductive wires of the first divided area are commonly connected to the non-divided area, and the three of the second divided area are connected. Two conductive lines may be commonly connected to the non-divided area, and the three conductive lines of the second divided area may be commonly connected to the second terminal.

The line width of one of the three conductive lines in the second divided region may be different from the line width of the other conductive line.

The line width of the conductive line of the first divided region may be greater than the line width of the conductive line of the second divided region.

The line spacing of the conductive lines of the first divided region may be the same as the line spacing of the conductive lines of the second divided region.

The non-divided region includes a first conductor region connected to the first divided region, a third conductor region connected to the second divided region, and a second conductor region disposed between the first conductor region and the third conductor region. It may include.

The effect of the wireless charging coil according to the embodiment is as follows.

According to at least one of the embodiments, the coil pattern includes at least two or more conductors separated or branched by the slit, and the width of the separated or branched conductor is specified, whereby the DC resistance becomes small, By reducing the difference between the DC resistance and the AC resistance and increasing the inductance, the quality factor can be significantly improved.

According to at least one of the embodiments, the coil pattern comprises at least two or more conductors separated or branched by slits, and by specifying the width of the separated or branched conductors, the spacing between the winding lines included in the coil pattern is reduced. It can be reduced, improving the quality factor and minimizing the occupied area occupied by the coil pattern, making the product compact. In addition, even if the distance between the winding line is reduced, there is an effect of reducing the difference between the DC resistance and the AC resistance during AC operation.

According to at least one of the embodiments, the coil pattern includes at least two or more conductors separated or branched by the slit, and by specifying the width of the separated or branched conductors, the spacing between the winding lines is reduced to inductance with respect to the same area. This increases the coefficient of quality compared to the same area in the end.

According to at least one of the embodiments, when the coil pattern is separated into a first lead and a second lead by a slit, the first lead and the second lead are connected by at least one or more connection lines, thereby reducing the phase difference of AC power. There is an advantage that the occurrence can be suppressed.

According to at least one of the embodiments, the coil may be divided into two to reduce the resistance component due to the skin effect and / or the resistance component due to the proximity effect. As the resistance component due to the resistance component and / or the proximity effect is reduced, the AC resistance is also reduced, and thus the quality factor is increased to increase the charging efficiency.

According to at least one of the embodiments, the line width of the coil that is wound along the direction from the center of the winding portion toward the outside of the winding portion increases, so that the cross-sectional area of the coil increases in proportion to the increase in the length of the coil so that There is an advantage that the quality factor can be increased because the AC resistance is not increased by suppressing the increase.

According to at least one of the embodiments, the second split of the second divided region than the number of conductors of the first split structure of the first divided region and the second divided region which are arranged before and after the non-divided region of the winding part. The larger the number of conductors in the structure, the line width of the conductors in the coil is less than or equal to 2δ in both the first and second divisions, thereby reducing the resistance component due to the skin effect and / or the resistance component due to the proximity effect. There is an advantage that the quality factor can be improved due to the reduction.

According to at least one of the embodiments, when the first terminal and the second terminal connected to both ends of the winding portion and the non-dividing region is disposed on the winding portion, the first terminal passes through the center and the second terminal of the winding portion; The first terminal, the non-divided area, and the second terminal by not overlapping with the second virtual straight line passing through the first virtual straight line or the center of the winding part and the non-dividing area or the second terminal do not overlap with the second virtual straight line. There is an advantage that the quality factor can be improved by reducing the AC current by removing the resistance component (Yp) due to the proximity effect generated in between.

Further scope of the applicability of the embodiments will become apparent from the detailed description below. However, various changes and modifications within the spirit and scope of the embodiments can be clearly understood by those skilled in the art, and therefore, specific embodiments, such as the detailed description and the preferred embodiments, are to be understood as given by way of example only.

1A is a diagram illustrating skin effect in a single coil.

FIG. 1B is a diagram illustrating a proximity effect in coils adjacent to each other. FIG.

2 is a block diagram illustrating a wireless charging system according to an embodiment.

3 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.

4 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 3.

5 is an exploded perspective view of a wireless power transmitter according to an embodiment.

6 shows a wireless power receiver according to an embodiment.

7A is a plan view illustrating the wireless charging coil module according to the first embodiment.

7B is a cross-sectional view illustrating the wireless charging coil module according to the first embodiment.

8A illustrates resistance and inductance according to a width of a coil in a structure in which a shield is attached to a coil pattern.

8B illustrates a resistance ratio and a quality factor according to a width of a coil in a structure in which a shield is attached to a coil pattern.

9A illustrates resistance and inductance according to a width of a coil in a structure in which a shield is attached to a coil pattern.

9B illustrates a resistance ratio and a quality factor according to a width of a coil in a structure in which a shield is attached to a coil pattern.

10A is a plan view illustrating a wireless charging coil module according to a third embodiment.

10B is a sectional view showing a wireless charging coil module according to a third embodiment.

FIG. 11A illustrates resistance and inductance according to the width of the coil in a structure in which a shield is attached to the coil pattern.

FIG. 11B illustrates the resistance ratio and the quality factor according to the width of the coil in the structure in which the shielding material is attached to the coil pattern.

12A is a plan view illustrating a wireless charging coil module according to a fourth embodiment.

12B is a sectional view showing a wireless charging coil module according to a fourth embodiment.

FIG. 13 is a plan view illustrating a wireless charging coil module according to a fifth embodiment.

14 to 19 are views for explaining a method of manufacturing a wireless charging coil according to the embodiment.

20 is a plan view illustrating a wireless charging coil module according to a sixth embodiment.

FIG. 21 is an enlarged view illustrating region A of FIG. 20.

FIG. 22 is an enlarged view illustrating region B of FIG. 20.

23 is a cross-sectional view taken along the line X-Y in the wireless charging coil module shown in FIG.

24 shows the positional relationship of the first terminal, the second terminal, and the non-divided area.

25 is an exploded perspective view of an electronic device according to an embodiment.

Hereinafter, an apparatus and various methods to which the embodiments are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the above description, all the elements (or layers) constituting the embodiments are described as being combined or operating in combination, but are not necessarily limited to the embodiments. In other words, all of the components may be selectively operated in combination with one or more within the scope of the embodiments. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art of the embodiments. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing the embodiments. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In the description of the embodiments, in the case of being described as being formed at "up (up) or down (down)", "before (front) or back (back)" of each component, "up (up) or down (Below) " and " before (front) or back (back) " include both formed by direct contact of two components or one or more other components disposed between two components.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art to which the embodiments belong, unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or overly formal sense unless explicitly defined in the examples.

In addition, in describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

In the following description of the embodiments, it will be apparent to those skilled in the art with respect to the related well-known technology that the detailed description thereof will be omitted.

In the description of the embodiment, the apparatus for transmitting wireless power on the wireless power charging system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, a wireless power transmitter for convenience of description. A wireless power transmitter, a wireless charging device, etc. will be used interchangeably. In addition, as a representation of a device for receiving wireless power from the wireless power transmitter, for convenience of description, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Terminals and the like may be used interchangeably.

The wireless power receiver according to the embodiment may be provided with at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power transmission method may include at least one of an electromagnetic induction method, an electromagnetic resonance method, and an RF wireless power transmission method. In general, the wireless power transmitter and the wireless power receiver constituting the wireless power system may exchange control signals or information through in-band communication or BLE (Bluetooth Low Energy) communication. Here, in-band communication and BLE communication may be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, or the like. For example, the wireless power receiver may transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching ON / OFF the current induced through the receiving coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various state information including received power strength information. The wireless power transmitter may calculate the charging efficiency or the power transmission efficiency based on the received power strength information.

Referring to FIG. 2, the wireless charging system includes a wireless power transmitter 10 that largely transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 30 that receives the received power. Can be configured.

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication for exchanging information using the same frequency band as the operating frequency used for wireless power transmission. In another example, the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication for exchanging information using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.

For example, the information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other. Here, the status information and control information exchanged between the transmitting and receiving end will be more clear through the description of the embodiments to be described later.

In-band communication and out-of-band communication may provide bidirectional communication, but are not limited thereto. In another embodiment, in-band communication and out-of-band communication may provide one-way communication or half-duplex communication.

For example, the unidirectional communication may be performed by the wireless power receiver 20 only transmitting information to the wireless power transmitter 10, but is not limited thereto. The wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.

In the half-duplex communication method, bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but at one time, only one device may transmit information.

The wireless power receiver 20 according to the embodiment may obtain various state information of the electronic device 30. For example, the state 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 the like. The information may be obtained from the electronic device 30 and may be utilized for wireless power control.

Referring to FIG. 3, the wireless power transmitter 200 may largely include a power converter 210, a power transmitter 220, a communicator 230, a controller 240, and a sensor 250. . It should be noted that the configuration of the wireless power transmitter 200 is not necessarily an essential configuration, and may include more or fewer components.

As shown in FIG. 3, when power is supplied from the power supply unit 260, the power converter 210 may perform a function of converting the power into power of a predetermined intensity.

To this end, the power converter 210 may convert the power supplied from the power supply unit 260 into power for wireless transmission.

The power transmitter 220 may include a multiplexer 221 (or a multiplexer) and a transmission coil 222. In addition, the power transmitter 220 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

As shown in FIG. 3, the power transmitter 220 may include a multiplexer 221 and a plurality of transmitter coils 222 to control transmission of output power of the power converter 210 to a transmitter coil. And first through n-th transmission coils.

When a plurality of wireless power receivers are connected, the control unit 240 according to the embodiment may transmit power through time division multiplexing for each transmission coil. For example, in the wireless power transmitter 200, three wireless power receivers, that is, the first to third wireless power receivers, are identified through three different transmitting coils, that is, the first to third transmitting coils, respectively. The controller 240 may control the multiplexer 221 to control power to be transmitted through a specific transmission coil in a specific time slot. The amount of power transmitted to the corresponding wireless power receiver may be controlled according to the length of the allocated time slot for each transmitting coil, but this is only one embodiment. Another example is an amplifier during an allocated time slot for each transmitting coil. The output power of each wireless power receiver may be controlled by controlling the amplification rate.

The control unit 240 may control the multiplexer 221 to sequentially transmit the detection signals through the first to nth transmission coils 222 during the first detection signal transmission procedure.

In addition, the control unit 240 supplies a predetermined transmission coil identifier and a corresponding transmission coil for identifying which transmission coil has received a signal strength indicator from the demodulator 232 during the first detection signal transmission procedure. Signal strength indicator received through the can be received. Subsequently, in the second detection signal transmission procedure, the control unit 240 controls the multiplexer 221 to transmit the detection signal only through the transmission coil (s) in which the signal strength indicator was received during the first detection signal transmission procedure. You may. As another example, when there are a plurality of transmitting coils receiving the signal strength indicator during the first sensing signal transmitting procedure, the controller 240 sends the second sensing signal to the transmitting coil in which the signal strength indicator having the largest value is received. In the procedure, the sensing signal may be determined as the transmitting coil to be transmitted first, and the multiplexer 221 may be controlled according to the determination result.

The modulator 231 may modulate the control signal generated by the controller 240 and transmit the modulated control signal to the multiplexer 221. Here, the modulation scheme for modulating the control signal is a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a PSK (Phase Shift Keying) modulation scheme, a pulse width modulation scheme, a differential 2 Differential bi-phase modulation schemes may be included, but is not limited thereto.

When the signal received through the transmitter coil is detected, the demodulator 232 may demodulate the detected signal and transmit the demodulated signal to the controller 240. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for controlling power during wireless power transmission, an end of charge (EOC) indicator, an overvoltage / overcurrent / overheat indicator, and the like. However, the present invention is not limited thereto, and may include various state information for identifying a state of the wireless power receiver.

In addition, the demodulator 232 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 240 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

For example, the wireless power transmitter 200 may obtain a signal strength indicator through in-band communication that communicates with the wireless power receiver using the same frequency used for wireless power transmission.

In addition, the wireless power transmitter 200 may transmit wireless power using the transmission coil 222, and may also exchange various information with the wireless power receiver through the transmission coil 222. As another example, the wireless power transmitter 200 further includes a separate coil corresponding to each of the transmission coils 222 (that is, the first to nth transmission coils), and wireless power using the separate coils provided. Note that in-band communication with the receiver may also be performed.

In the description of FIG. 3, the wireless power transmitter 200 and the wireless power receiver perform in-band communication by way of example. However, this is only one embodiment, and is a frequency band used for wireless power signal transmission. Short-range bidirectional communication may be performed through a frequency band different from that of FIG. For example, the short-range bidirectional communication may be any one of low power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

Referring to FIG. 4, the wireless power receiver 300 includes a receiving coil 310, a rectifier 320, a DC / DC converter 330, a load 340, a communication unit 360, and a main control unit ( 370 may be configured. Here, the communicator 360 may include at least one of a demodulator 361 and a modulator 362.

Although the wireless power receiver 300 illustrated in the example of FIG. 4 is illustrated as being capable of exchanging information with the wireless power transmitter through in-band communication, this is only one embodiment, and in another embodiment. The communication unit 360 may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

The AC power received through the receiving coil 310 may be transmitted to the rectifier 320. The rectifier 320 may convert AC power into DC power and transmit the DC power to the DC / DC converter 330. The DC / DC converter 330 may convert the strength of the rectifier output DC power into a specific intensity required by the load 340 and then transmit the converted power to the load 340. In addition, the receiving coil 310 may be configured to include a plurality of receiving coils (not shown), that is, the first to n-th receiving coil. Frequency of AC power delivered to each receiving coil (not shown) according to an embodiment may be different from each other, and another embodiment is a predetermined frequency controller with a function to adjust the LC resonance characteristics differently for each receiving coil It is also possible to set different resonant frequency for each receiving coil by using a.

The sensing unit 350 may measure the intensity of the rectifier 320 output DC power and provide the same to the main controller 370. Alternatively, the sensing unit 350 may measure the strength of the current applied to the receiving coil 310 according to the wireless power reception, and transmit the measurement result to the main control unit 370.

For example, the sensing unit 350 may measure the internal temperature of the wireless power receiver 300 and provide the measured temperature value to the main controller 370.

As an example, the main controller 370 may determine whether the overvoltage is generated by comparing the measured intensity of the rectifier output DC power with a predetermined reference value. As a result of the determination, when the overvoltage is generated, a predetermined packet indicating that the overvoltage has occurred may be generated and transmitted to the modulator 362. Here, the signal modulated by the modulator 362 may be transmitted to the wireless power transmitter through the receiving coil 310 or a separate coil (not shown). In addition, the main controller 370 may determine that the sensing signal is received when the intensity of the rectifier output DC power is greater than or equal to a predetermined reference value. When the sensing signal is received, a signal strength indicator corresponding to the sensing signal may be modulated by the modulator 362. Can be transmitted to the wireless power transmitter. As another example, the demodulator 361 demodulates an AC power signal or a rectifier 320 output DC power signal between the receiving coil 310 and the rectifier 320 to identify whether a detection signal is received, and then, the main subject of the identification result. The unit 370 may be provided. The main controller 370 may control a signal strength indicator corresponding to the sensing signal to be transmitted through the modulator 362.

The wireless power transmitter according to the embodiment may be the wireless power transmitter 10 shown in FIG. 2 or the wireless power transmitter 200 shown in FIG. 3.

Referring to FIG. 5, the wireless power transmitter according to the embodiment may include a first bracket 400, a first substrate 500, a second bracket 600, a shielding material 605, a transmission coil 610, and a second substrate ( 700). It should be noted that the above-described configuration of the wireless power transmitter is not necessarily an essential configuration, and may include more or fewer components.

The first and

second substrates

500 and 700 may be printed circuit boards (PCBs) or flexible printed circuit boards (FPCBs), but are not limited thereto.

The first bracket 400 may be fastened to the second bracket 600. That is, the first bracket 400 and the second bracket 600 may be fastened using bolts such as screws.

The first substrate 500 may be located on the first bracket 400. The first substrate 500 may be fastened to the first bracket 400 and / or the second bracket 600. For example, a screw may be fastened to the second bracket 600 by passing through the first bracket 400 and the first substrate 500.

Various circuit parts for driving or controlling the transmission coil 610 may be mounted on the bottom surface of the first substrate 500. For example, the circuit unit includes a multiplexer 221 shown in FIG. 3, a wireless charging communication unit 230, a timer 255, a sensing unit 250, a control unit 240, and a wireless charging communication unit shown in FIG. 4 ( 360, the main control unit 370, and the sensing unit 350 are not limited thereto.

The first substrate 500 may have a rigid rectangular shape, but is not limited thereto. Therefore, the first substrate 500 may support the shielding material 605, the transmission coil 610, and the like disposed on the upper surface. In addition, an area of the first substrate 500 may be larger than an area of the transmission coil 610 and an area of the shielding material 605. One side of the first substrate 500 may include a terminal unit 660. The circuit part of the first substrate 500 may be electrically connected to the circuit parts of the transmission coil 610 and the second substrate 700 by using the terminal part. The terminal portion may be formed of a plurality of pins or pads, but is not limited thereto.

The shield 605 may be disposed on the top surface of the first substrate 500.

In detail, the shielding material 605 may be disposed in the opening 601 of the second substrate 700 on the upper surface of the first substrate 500. As another example, the shielding material 605 may be disposed under the second substrate 700 and over the first substrate 500. In this case, the area of the shielding material 605 may be larger than the area of the opening 601 of the second substrate 700. Thus, the edge region of the shield 605 may overlap the frame 603 of the second substrate 700. As another example, the shielding material 605 may be disposed on the second substrate 700. In this case, the area of the shielding material 605 may be larger than the area of the opening 601 of the second substrate 700. Thus, the edge region of the shield 605 may overlap the frame 603 of the second substrate 700.

In order to sufficiently shield the magnetic field of the transmission coil 610, the area of the shielding material 605 may be larger than that of the transmission coil 610.

The transmission coil 610 may be disposed on the shield 605. The transmission coil 610 may include one or more transmission coils 620 to 640. The one or more transmission coils 620 to 640 may be one or more transmission coils of the wireless power transmitter or one or more reception coils of the wireless power receiver. In addition, when there are a plurality of transmission coils 610, each of the transmission coils 620 to 640 may be wound by the same number of turns. However, the present invention is not limited thereto and may be wound around different turns. In addition, the plurality of transmission coils 620 to 640 may have the same inductance. However, the present invention is not limited thereto and may have different inductances. In addition, the plurality of transmission coils 620 to 640 may be arranged in one or more layers. More specifically, the plurality of transmission coils 620 to 640 may include first to third transmission coils 620 to 640. The second transmission coil 630 and the third transmission coil 640 may be arranged parallel to each other on the same layer, that is, the first layer. In this case, the first transmission coil 620 may be disposed on a second layer different from the first layer. For example, some areas of the first transmission coil 620 may be disposed to overlap some areas of the second transmission coil 630 and other areas overlap with some areas of the third transmission coil 640. I never do that.

As such, the plurality of transmission coils 620 to 640 may be disposed on different layers to expand the charging region to efficiently transmit wireless power. In particular, the first transmission coil 620 may be disposed on the same layer as the substrate 400.

The transmission coil 610 may be coated with an insulating material or coated with an insulating layer on the outer surface.

The area of the shielding material 605 may be larger than the area occupied by the first to third transmission coils 620 to 640. The batch occupancy area may be a total area occupied by the first to third transmission coils 620 to 640. Therefore, the electromagnetic fields generated by the first to third transmission coils 620 to 640 may be shielded by the shielding material 605 so as not to affect the circuit part or the outside mounted on the first substrate 500.

The shield 605 may be disposed on the bottom surface of the transmission coil 610. The upper surface of the shielding material 605 may be in contact with the lower surface of the transmission coil 610, specifically, the lower surfaces of the second and third transmission coils 630 and 640, but is not limited thereto.

For example, an adhesive or an adhesive member (not shown) is disposed between the upper surface of the shield 605 and the lower surfaces of the second and third transmission coils 630 and 640 so that the second and third transmission coils 630 may be disposed on the shield 605. , 640 may be fixed. The shielding material 605 may guide the wireless power generated from the transmission coil 610 disposed above, in the charging direction, and may protect various circuit parts mounted below the first substrate 500 from electromagnetic fields.

The second substrate 700 may be disposed on the transmission coil 610 or the second bracket 600. The second substrate 700 may be fastened to the second bracket 600 by using bolts such as screws.

For example, when the transmission coil 610 is disposed on the first layer and the second and third transmission coils 630 and 640 and the first transmission coil 620 is disposed on the second layer above the first layer, The overall thickness of the layer and the second layer may be greater than the thickness of the second bracket 600. To this end, some regions of both ends of the second bracket 600 may have first and

second protrusions

602 and 604 protruding upward. Accordingly, the second substrate 700 is fastened to the first and second protrusions protruding from both ends of the second bracket 600, so that at least an upper surface of the first transmission coil 620 is lower than the lower surface of the second substrate 700. Since the first transmission coil 620 is not damaged due to contact with the lower surface of the second substrate 700, the first transmission coil 620 may be prevented from being contacted.

For example, a circuit unit such as the near field communication units 270 and 380 illustrated in FIG. 3 or 4 may be mounted on the upper surface of the second substrate 700. In addition, wireless communication coils 280 and 390 may be disposed in a pattern on the upper surface of the second substrate 700. The wireless communication coils 280 and 390 may have at least one turn. Although not shown, both ends of the wireless communication coils 280 and 390 may be electrically connected to circuit units such as the short range communication units 270 and 380 through via holes. In addition, the circuit portion of the second substrate 700 may be electrically connected to the controller (240 of FIG. 3) or the main controller (370 of FIG. 4) mounted on the first substrate 500 using, for example, a cable or a bus line. Can be.

6 shows a wireless power receiver according to an embodiment.

The wireless power receiver 800 according to the embodiment may be the wireless power receiver 20 illustrated in FIG. 2 or the wireless power receiver 300 illustrated in FIG. 4. The wireless power receiver shown in FIG. 6 may be referred to as a multi-mode antenna module.

Referring to FIG. 6, the wireless power receiver 800 according to the embodiment includes a printed circuit board 860, a first antenna 810, a second antenna 820, a first connection terminal 840, and a second connection terminal. 850 may be configured. The first antenna 810 may be a wireless charging coil of the embodiment. The operating frequency of the first antenna 810 may be about 110 KHz to about 205 KHz.

In detail, the wireless power receiver 800 according to the embodiment includes a printed circuit board 860, a first antenna 810 disposed in a patterned area in a central area of the printed circuit board 860, and a first local area for wireless charging. The second antenna 820 is pattern-printed and disposed on the outer side of the first antenna 810 for wireless communication, and the outer side of the second antenna 820 so as not to overlap the second antenna 820 for the second short range wireless communication. The third antenna 830 and the first connection terminal 840 and the second antenna 820 and the third antenna for connecting both ends of the first connection pattern corresponding to the first antenna 810 are pattern-printed on The second connection terminal 850 may be configured to connect both ends of the second to third connection patterns respectively corresponding to 830.

Here, the first connection terminal 840 and the second connection terminal 850 may be physically disposed on the printed circuit board 850. For example, the first connection terminal 840 and the second connection terminal 850 may be physically formed on the printed circuit board 860 so that the first connection pattern does not overlap the second antenna 820 and the third antenna 830. Can be arranged separately.

The connection pattern of each antenna may be formed by lead wires extending from both ends of the antenna, or branched at a specific position of the antenna. Here, the position where the connection pattern and the connection terminal of each antenna are arranged may be arranged to minimize the length of the connection pattern.

For example, the first short range wireless communication may be Magnetic Secure Transmission (MST), and the second short range wireless communication may be Near Field Communication (NFC). Here, the operating frequency in the MST is, for example, 3.24MHz, the operating frequency in the NFC may be, for example, 13.56MHz.

As another example, the first short range wireless communication may be NFC, and the second short range wireless communication may be MST.

As another example, the first short range wireless communication and the second short range wireless communication may correspond to any one of NFC, RFID communication, Bluetooth communication, Ultra Wideband (UWB) communication, MST communication, Apple Pay communication, and Google Pay communication, respectively. have.

The pattern of the antenna may be disposed on the printed circuit board 360 such that the separation distance between the second antenna 320 and the third antenna 330 is maintained at least 1 mm. The second antenna 320 and the third antenna 330 are the printed circuit board 360 so that the deviation of the separation distance between the second antenna 320 and the third antenna 330 is maintained below a predetermined first reference value. Can be placed in.

In addition, a pattern of the corresponding antenna may be disposed on the printed circuit board 360 so that the separation distance between the first antenna 310 and the second antenna 320 is maintained at least 0.5 mm. The first antenna 310 and the second antenna 320 are printed circuit board 360 so that the deviation of the separation distance between the first antenna 310 and the second antenna 320 is maintained below a predetermined second reference value. Can be placed in.

For example, the first antenna 310 may be pattern printed on both sides of the printed circuit board 360, and the patterns printed on both sides through the through holes (not shown) disposed on the printed circuit board 360 may mutually be printed. Can be conductive. Through this, the resistance component of the first antenna can be reduced, and thus the reception sensitivity of the antenna can be improved.

As another example, the second antenna 320 may be pattern printed on both sides of the printed circuit board 360, and the patterns printed on both sides through through holes (not shown) disposed in the printed circuit board 360 may be formed. May be conductive to each other. Through this, the resistance component of the second antenna can be reduced, and thus the reception sensitivity of the corresponding antenna can be improved.

As another example, the third antenna 330 may be pattern printed on both sides of the printed circuit board 360, and the patterns printed on both sides through through holes (not shown) disposed in the printed circuit board 360. This can be mutually conductive. Through this, the resistance component of the third antenna can be reduced, and thus the reception sensitivity of the corresponding antenna can be improved.

As another example, at least one of the first antenna 310, the second antenna 320, and the third antenna 330 may be pattern printed on both surfaces of the printed circuit board 360, respectively. Corresponding antenna patterns printed on both sides may be connected to each other through a through hole (not shown) disposed at 360. Through this, the resistance component of the antenna can be reduced, and thus the reception sensitivity of the antenna can be improved.

As shown in FIG. 6, the first antenna 310 may be printed on the printed circuit board 360 in a circular pattern having a predetermined inner diameter, and the first connection terminal may be disposed outside the inner diameter. It is only one embodiment.

The transmission coil 610 of FIG. 5 and / or the reception coil 810 of FIG. 6 of the wireless power transmitter described above may be referred to as a wireless charging coil described below.

Hereinafter, a wireless charging coil module for maintaining a predetermined level of DC resistance (R _dc ) so as not to increase the AC resistance (R _ac ) will be described.

To minimize the effects of skin and proximity effects, the radius of the coil should be less than or equal to the skin depth. The skin depth δ can be represented by Equation 3.

δ represents the skin depth, μ represents the permeability, σ represents the conductivity, and f may represent the operating frequency.

Therefore, when the diameter of the coil is 2δ or less, since the entire region inside the coil shown in FIGS. 1A and 1B has a uniform magnetic flux density, the resistance component (Ys) and the proximity effect due to the skin effect shown in Equation 2 are obtained. The resistive component Yp due to can be made substantially zero.

However, when the diameter of the coil is 2δ or less, since the cross-sectional area of the coil is small, there is a problem that the DC resistance is large. DC resistance (R _dc ) can be represented as shown in Equation 4.

ρ represents the resistivity, l represents the length of the coil, and S represents the cross-sectional area of the coil.

As the cross-sectional area S of the coil decreases from Equation 4, the DC resistance R _dc increases. As the length (l) of the coil increases from Equation 4, the DC resistance R _dc increases.

From Equation 4, even if the coil diameter is less than or equal to 2δ, even if the resistance component Ys due to the skin effect and the resistance component Yp due to the proximity effect are substantially zero, the DC resistance R _dc itself exceeds a certain level. Since it becomes large, the AC resistance R _ac becomes larger than the DC resistance Rdc.

Therefore, there is an urgent need for a coil design to maintain a constant level of DC resistance R _dc so as not to increase AC resistance R _ac .

The wireless charging coil module according to the first to fifth embodiments below can suppress the increase of the AC resistance (R _ac ) while maintaining the DC resistance (R _dc ) at a constant level.

7A is a plan view illustrating the wireless charging coil module according to the first embodiment, and FIG. 7B is a cross-sectional view illustrating the wireless charging coil module according to the first embodiment.

7A and 7B, the wireless charging coil module 900 according to the first embodiment may provide a film 901. The film 901 may serve as a substrate for forming the wireless charging coils 903 and 906. In addition, the wireless charging coils 903 and 906 can be protected and supported. The film 901 may be formed of a thin material and a flexible material. In detail, the film 901 may be polyimide (PI) or polyethylene terephthalate (PET).

The wireless charging coil module 900 according to the first embodiment may provide a shielding material 907. The shielding material 907 may shield the electromagnetic fields of the wireless charging coils 903 and 906. The shielding material 907 may include a metal material. The shielding material 907 may be made of, for example, a ferrite material, but is not limited thereto. The shield 907 may support the wireless charging coils 903 and 906. The area of the shielding material 907 may be larger than that of the wireless charging coils 903 and 906.

The shield 907 may be disposed under the film 901. The shield 907 may be attached to the film 901 using an adhesive (not shown). Since the adhesive is very thin, the shield 907 may be considered to be in contact with the bottom surface of the film 901. The adhesive may be made of a material having excellent heat dissipation performance and insulation properties.

The wireless charging coil module 900 according to the first embodiment may provide a heat dissipation material 909. The heat dissipation material 909 may be disposed under the shielding material 907. The heat dissipation material 909 may be attached to the shielding material 907 using an adhesive (not shown). The heat dissipation material 909 may be in contact with the bottom surface of the shielding material 907. The heat dissipation material 909 may be made of a metal material. For example, the heat dissipation material 909 may be made of copper (Cu), but is not limited thereto.

Although not shown, the heat dissipation material 909 may be disposed inside the shielding material 907. In this case, the heat dissipating material 909 may be particles or beads having a plate shape or excellent heat dissipation characteristics.

The heat dissipation material 909 may support the wireless charging coils 903 and 906 and the shielding material 907. The heat dissipation material 909 may discharge heat generated from the wireless charging coils 903 and 906 to the outside. The greater the thickness of the heat dissipating material 909, the better the heat dissipation performance. However, since the volume of the wireless charging coil module 900 increases in proportion to the thickness, optimization of the thickness of the heat dissipating material 909 is required. For example, the thickness of the heat dissipation material 909 may be 2 to 5 times thicker than the thickness of the shielding material 907.

The heat dissipation material 909 may be selectively adopted according to the heat generation state of the wireless charging coil module 900. For example, when heat generation of the wireless charging coil module 900 hardly occurs, the heat dissipation material 909 may be omitted.

The wireless charging coil module 900 according to the first embodiment may provide the wireless charging coils 903 and 906. The wireless charging coils 903 and 906 are members for receiving wireless power from the wireless power transmitter, and may be, for example, the first antenna 810 shown in FIG. 6.

In the first embodiment, the wireless charging coils 903 and 906 may include a coil portion 903. The coil unit 903 may be disposed on an upper surface of the film 901. Although not shown, the coil 903 may be disposed directly on the upper surface of the shield 907.

The coil unit 903 may include a coil pattern 904 wound in a spiral shape. The coil pattern 904 may include a plurality of winding lines 904_1 to 904_13. 7A and 7B illustrate first to thirteenth winding lines 904_1 to 904_13 having 13 turns with the coil pattern 904 for convenience of description. The coil unit 903 according to the first embodiment may include less than 13 winding lines or more than 13 winding lines.

In the coil unit 903 according to the first embodiment, the distance D1 between two adjacent winding lines may be 1δ or less. An interval D1 between two adjacent winding lines may be 200 μm or less. An interval D1 between two adjacent winding lines may be 150 μm or less.

However, if the distance between the two winding lines is reduced, the effect of the skin effect and / or proximity effect may be increased. In the past, limitations have been made in reducing the spacing between two winding lines in consideration of such skin and / or proximity effects. For example, although the process capability can reduce the distance between the two winding lines to 150 μm, the process limit, two winding lines above 350 μm due to the increase in the AC resistance due to the skin effect and / or the proximity effect. We are designing.

According to an embodiment, the winding lines 904_1 to 904_13 may be spaced apart from each other. The gap D1 between the winding lines 904_1 to 904_13 may have a minimum gap allowed in the process. For example, the distance D1 between the winding lines 904_1 to 904_13 may be approximately 150 μm due to a process limit due to the etching method of the rolled steel sheet. Due to the process error, the distance D1 between the winding lines 904_1 to 904_13 according to the embodiment may be 150 ± 50 μm. Due to the process error, the distance D1 between the winding lines 904_1 to 904_13 according to the embodiment may be 150 ± 5 μm. When the process capability is improved, the distance D1 between the winding lines 904_1 to 904_13 according to the embodiment may be 150 μm or less.

According to the first embodiment, each of the winding lines 904_1 to 904_13 may be separated into the first conductive line 904a and the second conductive line 904b by the slit 911. In this case, the thickness T of each of the first conductive wire 904a and the second conductive wire 904b may be 1 δ or less. The thickness T of each of the first conductive wire 904a and the second conductive wire 904b may be 150 μm or less. The thickness T of each of the first conductive wire 904a and the second conductive wire 904b may be 120 μm or less.

The coil pattern 904 according to the first embodiment may be formed by a process method by an etching method of a rolled steel sheet. This process method will be described later (see FIGS. 14 to 19). This process method makes it possible to form a much higher height than the conventional coil pattern of the FPCB type, it is possible to make a coil having a large cross-sectional area and a low resistance. The coil pattern of the conventional FPCB type has a high resistance due to the limited height of the coil. In the conventional FPCB type coil pattern, two layers of coils are formed on both sides in order to secure a predetermined level or more of resistance. If the coil is formed on both sides, there is a disadvantage that the process is complicated and the material cost increases.

The coil pattern 904 according to the first embodiment may be formed in, for example, a quadrangle having a thickness and a width, but is not limited thereto. Coils made of a rolled steel sheet method may have a relatively constant cross section compared to other types of coils.

The inner diameter of the coil pattern 904 according to the first embodiment, that is, the diameter of the hollow part 906 may be, for example, 20 mm or more. The outer diameter of the coil pattern 904 may be 50 mm or less. An outer diameter of the coil pattern 904 may be 48 mm to 50 mm or less.

Conventional coils have long coil lengths to ensure inductance of the coils. However, the outer diameter can only be limited to the size of the smartphone in which the coil pattern is disposed. Accordingly, the outer diameter is limited to a maximum of 50m. The diameter of the hollow part 906 was inevitably formed within 20 mm.

In the coil pattern 904 as described above, the DC resistance Rdc may be lowered and the difference between the DC resistance Rdc and the AC resistance Rac may be minimized during the AC operation.

As shown in Equation 2, although the DC resistance Rdc is constant, the AC resistance may increase as the skin resistance and proximity effect are more affected.

By the coil pattern 904 according to the first embodiment, the DC resistance Rdc is lowered, and the influence of the skin effect and the proximity effect can be reduced or minimized. This can be expressed as the ratio of AC resistance to DC resistance (Rac / Rdc). As the skin effect and proximity effect are minimized, the AC resistance (Rac) is closer to the DC resistance (Rdc), so that the ratio (AC / Rdc) of the AC resistance and the DC resistance can converge to almost one.

In the coil pattern 904 according to the first embodiment, a ratio (Rac / Rdc) of an AC resistance and a DC resistance may be 10% or less. The ratio of AC resistance to DC resistance (Rac / Rdc) of less than 10% may mean that the DC resistance (Rdc) is less than 10% of the AC resistance (Rac). When the ratio of AC resistance and DC resistance (Rac / Rdc) of the coil pattern 904 is 10% or more in the pure coil state, the ratio of AC resistance and DC resistance (Rac / Rdc) in the coil module state after installing the shielding material is A difference of 50% to 70% occurs. This is because the shielding material further amplifies the skin effect and / or the proximity effect in the coil pattern 904. Therefore, before mounting the shielding material, the ratio (AC / Rdc) of the AC resistance and the DC resistance of the coil pattern 904 should be reduced in the pure coil state. The ratio Rac / Rdc can be made small.

The coil pattern 904 according to the embodiment may have a ratio (Rac / Rdc) of an AC resistance and a DC resistance within 5%.

The coil pattern 904 according to the embodiment may have a ratio (Rac / Rdc) of an AC resistance and a DC resistance within 3%.

As described above, when the shielding material 907 is disposed on one side of the coil patterns 904 of the wireless charging coils 903 and 906, the ratio of the AC resistance and the DC resistance under the influence of the shielding material 907 (Rac / Rdc) This may be different from the case where only the coil pattern 904 is disposed. The structure in which only the coil pattern 904 is disposed may be referred to as a bare coil structure, and the structure formed by combining the coil pattern 904 and the shielding material 907 may be referred to as a structure in which a shielding material is attached to the coil pattern. .

For example, in the structure in which the shielding material is attached to the coil pattern, a ratio (Rac / Rdc) of AC resistance and DC resistance may be 50% or less. For example, in the structure in which the shielding material is attached to the coil pattern, the ratio (Rac / Rdc) of the AC resistance and the DC resistance may be 30% or less. For example, in the structure in which the shielding material is attached to the coil pattern, a ratio (Rac / Rdc) of AC resistance and DC resistance may be 20% or less.

In the coil pattern 904 according to the embodiment, the inductance of the bare coil structure may be greater than or equal to 6.3 μH.

In the coil pattern 904 according to the embodiment, the inductance of the bare coil structure may be 6.5 μH or more.

In the coil pattern 904 according to the embodiment, the inductance may be 10.5 μH or more in a structure in which a shielding material is attached to the coil pattern.

In the coil pattern 904 according to the embodiment, inductance may be 11 μH or more in a structure in which a shielding material is attached to the coil pattern.

In the coil pattern 904 according to the embodiment, the quality factor Q may be 16 or more in a bare coil structure.

In the coil pattern 904 according to the embodiment, the quality factor Q may be 16.5 or more in a bare coil structure.

In the bare coil structure, the conventional quality factor Q is 4 to 5, whereas in the bale coil structure according to the first embodiment, the quality factor Q may be increased by three times or more.

The coil pattern 904 according to the embodiment may have a quality factor Q of 21 or more in a structure in which a shielding material is attached to the coil pattern.

The coil pattern 904 according to the embodiment may have a quality factor Q of 22 or more in a structure in which a shielding material is attached to the coil pattern.

In the structure in which the shielding material is attached to the coil pattern, the quality factor Q is 7 to 8, whereas in the structure in which the shielding material is attached to the coil pattern according to the first embodiment, the quality factor Q is increased by three times or more. Can be.

In the first embodiment, the wireless charging coils 903 and 906 may include a hollow portion 906. The hollow part 906 may be formed inside the coil pattern 904. The hollow part 906 may be an empty area in which the coil pattern 904 is not disposed. The hollow part 906 may have a substantially circular shape or a rectangular shape, but is not limited thereto.

The plurality of winding lines 904_1 to 904_13 of the coil unit 903 may be spirally wound along the circumference of the hollow part 906. The first terminal 905a is disposed on one side of the coil pattern 904, that is, the hollow portion 906, adjacent to the inner side of the coil pattern 904, and the other side of the coil pattern 904 and the coil pattern 904. The second terminal 905b may be disposed in an area adjacent to the outside. For example, one side of the coil pattern 904 is a partial region of the innermost winding line (eg, the first winding line 904_1), and the other side of the coil pattern 904 is the outermost winding line (eg, the first winding line). 13 may be a partial region of the winding line 904_13. Therefore, the coil pattern 904 may be connected to the first terminal 905a and wound in a helical direction, and then connected to the second terminal 905b. The winding direction can be clockwise or counterclockwise. The coil pattern 904 and the first and

second terminals

905a and 905b may be integrally formed. Alternatively, the first and

second terminals

905a and 905b may be formed separately from the coil pattern 904 and then electrically connected to the coil pattern 904 by a bonding process. The width W of each of the first and

second terminals

905a and 905b may be equal to or greater than the distance D1 between the winding lines 904_1 to 904_13. The first and

second terminals

905a and 905b may be electrically connected to a circuit unit for supplying power. For example, when an AC voltage is applied to the first and

second terminals

905a and 905b, a current may flow in the coil pattern 904 in a clockwise or counterclockwise direction periodically based on the hollow part 906.

Although not shown, the wireless charging coils 903 and 906 are connected to the first terminal 905a adjacent to the hollow portion 906 to extend the connection member extending across the coil pattern 904 to the outside of the coil pattern 904. It may include. The connection member extending out of the coil pattern 904 may be connected to a connection terminal disposed adjacent to the second terminal 905b. An insulating layer may be disposed between the connecting member and the coil pattern 904 to prevent an electrical short between the connecting member and the coil pattern 904. The connection member may be formed of the same metal material as the coil pattern 904, but is not limited thereto.

Meanwhile, in the first embodiment, the coil unit 903 may include a first conductive line 904a, a second conductive line 904b, and a slit 911. The slit 911 is an area where the first conductive line 904a and the second conductive line 904b do not exist and may be referred to as an opening, a hole, a hole, or a recess. The first conductive line 904a and the second conductive line 904b may be separated or branched by the slit 911.

According to an embodiment, the thickness T of each of the first conductive line 904a and the second conductive line 904b may be 1δ or less.

The thickness T of each of the first conductive wire 904a and the second conductive wire 904b may be 150 μm or less.

The thickness T of each of the first conductive line 904a and the second conductive line 904b may be 120 μm or less.

According to the embodiment, the width D2 of the slit 911 may be 1δ or less.

The width D2 of the slit 911 according to the embodiment may be 200 μm or less.

The width D2 of the slit 911 according to the embodiment may be 150 μm or less.

The width D2 of the slit may be a gap between the winding lines 904_1 to 904_13.

The first conductive line 904a, the second conductive line 904b, and the slit 911 may be provided in the coil pattern 904, that is, the entire area of the plurality of winding lines 904_1 to 904_13. The slit 911 is formed along a length direction of the winding lines 904_1 to 904_13 from one region of the coil pattern 904 connected to the first terminal 905a, that is, one region of the first winding line 904_1. The other side of the coil pattern 904 connected to the second terminal 905b, that is, up to one region of the thirteenth winding line 904_13 may be formed. Accordingly, the first conductive line 904a and the second conductive line 904b separated or branched by the slit 911 formed as described above may also be a region of the thirteenth winding line 904_13 from one region of the first winding line 904_1. It can be formed up to.

The first conductive line 904a may have the same width W in each of the first winding line 904_1 to the thirteenth winding line 904_13, but the embodiment is not limited thereto. The second conductive line 904b may have the same width W in each of the first winding line 904_1 to the thirteenth winding line 904_13, but the embodiment is not limited thereto.

In the first embodiment, the coil unit 903 may include a first connector 913a and a second connector 913b. For example, the first connector 913a may be located in one region of the first winding line 904_1, and the second connector 913b may be located in one region of the thirteenth winding line 904_13. The first connecting portion 913a connects the first conductive line 904a and the second conductive line 904b in one region of the first winding line 904_1, and the second connecting portion 913b connects the thirteenth winding line 904_13. The first conductive line 904a and the second conductive line 904b may be connected in one region of the region.

The first winding line 904_1 may be integrally formed with the first connection part 913a, and the thirteenth winding line 904_13 may be integrally formed with the second connection part 913b.

Therefore, when a voltage is applied to the first terminal 905a, a current flows simultaneously through the first conductor 904a and the second conductor 904b via the first connection portion 913a connected to the first terminal 905a. Can be. Likewise, when a voltage is applied to the second terminal 905b, a current is simultaneously applied to the first conductive wire 904a and the second conductive wire 904b via the second connection portion 913b connected to the second terminal 905b. Can flow.

As another example, the first connector 913a is included in the first terminal 905a instead of the coil pattern 904, and the second connector 913b is included in the second terminal 905b instead of the coil pattern 904. Can be. The first connector 913a, the second connector 913b, and the first and

second terminals

905a and 905b may be integrally formed.

In exemplary embodiments, each of the first and second

conductive wires

904a and 904b may have a width of 2δ ± 50 μm (2δ-50 μm to 2δ + 50 μm).

In exemplary embodiments, each of the first and second

conductive wires

904a and 904b may have a width of 2δ ± 5 μm (2δ−5 μm to 2δ + 5 μm).

The skin depth δ or delta or delta may vary depending on the operating frequency used in the wireless charging coils 903 and 906, as shown in Equation 3. In this case, the magnetic permeability μ and the electrical conductivity σ can be represented as shown in Table 1 under the assumption that they have a constant.

동작주파수Operating frequency	표피깊이(δ)Skin depth (δ)
100kHz100 kHz	209㎛209 ㎛
128kHz128 kHz	185㎛185 ㎛
200kHz200 kHz	148㎛148㎛
6.78MHz6.78 MHz	25㎛25 μm

For example, when an operating frequency of 128 kHz is used, the width of each of the first conductive wire 904a and the second conductive wire 904b may be 370 μm, that is, 2δ or less. The coil pattern 904 standard used in each of the bare coil structure and the structure in which the shielding material is attached to the coil pattern may be shown in Table 2. The shield 907 may consist of four layers and have a shielding rate of 1400.

	비교예Comparative example	제1 실시예First embodiment
Line width(㎛)Line width (㎛)	800800	900900
Line space(㎛)Line space (㎛)	350350	150150
Line pitch(㎛)Line pitch (㎛)	11501150	10501050
Coil 외경(mm)Coil Outer Diameter (mm)	48.248.2	48.248.2
Coil 내경(mm)Coil Inner Diameter (mm)	1919	21.221.2
턴수Turns	1313	1313

The width of 900 μm, which is the width of the first embodiment, may be the sum of the width of the first conductive line 904a, the width of the second conductive line 904b, and the width of the slit 911, that is, the width of the winding lines 904_1 to 904_13. In this case, when an operating frequency of 128 kHz is used, the width of each of the first conductive wire 904a and the second conductive wire 904b may be 370 μm or less. The width of each of the first conductive line 904a and the second conductive line 904b may have a range of 320 to 420 μm in consideration of a process error. In the stabilized process, each of the first and second

conductive wires

904a and 904b may have a width of 365 to 375 μm. In the case of forming the coil pattern 904 by a leaf frame process, overetching Process errors should be considered. Accordingly, each of the first conductive wire 904a and the second conductive wire 904b may be 375 μm, and the width of the slit 911 may be 150 μm. Therefore, 900 µm which is the sum of the width of the first conductive wire 904a, the width of the second conductive wire 904b, and the width of the slit 911, that is, the interval between the first conductive wire 904a and the second conductive wire 904b. Can be calculated.

The measured values in the bare coil structure of the coil pattern 904 according to the embodiment may be shown in Table 3.

L(μH)L (μH)	6.686.68
Rac(Ω)Rac (Ω)	0.320.32
Rdc(Ω)Rdc (Ω)	0.320.32
QQ	16.5316.53
Rac/RdcRac / Rdc	1One

As shown in Table 3, the inductance L measured at the coil pattern 904 in the bare coil structure is 6.68, and the AC resistance Rac and the DC resistance Rdc have the same resistance value, that is, 0.32Ω, and the quality Coefficient (Q) is 16.53, and the ratio of AC resistance and DC resistance (Rac / Rdc) may be one. Therefore, the quality factor Q in the first embodiment may be 16 or more. By the measured value in this bare coil structure, the inductance L can be larger than in the related art. In particular, it can be seen that the quality factor Q is significantly increased compared with the conventional art. In addition, the ratio of AC resistance and DC resistance (Rac / Rdc) was measured to be equal to the maximum ratio (1). From this, when the coil pattern 904 is designed as shown in Table 2, it can be confirmed that there is no effect of the skin effect and the proximity effect.

FIG. 8A shows the resistance and inductance according to the width of the winding line in the structure with the shield attached to the coil pattern, and FIG. 8B shows the resistance ratio and the quality factor according to the width of the winding line in the structure with the shield attached to the coil pattern. do.

The data shown in FIGS. 8A and 8B show measured values obtained by experiments in a situation where a shielding material 907 as well as a coil pattern 904 is provided.

As shown in Fig. 8A, the inductance of the comparative example was 9.69 mu H, whereas the inductance of the first example was 11.6 mu H, which was 19.7% or more larger than the comparative example. The DC resistance of the comparative example is 0.491Ω, whereas the DC resistance of the first embodiment is smaller, 0.336Ω. Similarly, the AC resistance of the comparative example is 0.65Ω, while the AC resistance of the first embodiment is smaller, 0.418Ω. In addition, although the ratio of DC resistance Rdc and AC resistance Rac differs by 32% in the comparative example, the ratio of DC resistance Rdc and AC resistance Rac of the first embodiment is 24% to 30% or less. It can be seen that the decrease.

From this, it can be seen that in the wireless charging coil module 900 according to the first embodiment, the inductance is larger, the DC resistance and the AC resistance are smaller, and the difference between the DC resistance and the AC resistance is smaller than that of the comparative example.

As shown in FIG. 8B, the quality factor of the comparative example is 11.99, whereas the quality factor of the first example is 22.32, which is 86.2% higher than that of the comparative example. Accordingly, the maximum quality factor can be secured, and the power transmission efficiency can be significantly improved.

On the other hand, as shown in Table 3 and Figure 8b, the inductance (L) in the bare coil structure is 6.68μH, while the inductance (L) in the structure with the shielding material attached to the coil pattern is 11.6, than in the bare coil structure Increased even more. In addition, the quality factor Q in the bare coil structure is 16.53, whereas the quality factor Q in the structure in which the shielding material is attached to the coil pattern is 22.32, which is further increased than in the bare coil structure.

According to the wireless charging coil module 900 according to the first embodiment, each of the coil pattern 904 includes a first conductor 904a and a second conductor 904b separated or branched by a slit 911. By making the width of each of the first conductive wire 904a and the second conductive wire 904b less than or equal to 2δ, the DC resistance (or AC resistance) is reduced and the inductance is increased, so that the quality coefficient is remarkably improved. Can be.

According to the wireless charging coil module 900 according to the first embodiment, each of the coil pattern 904 includes a first conductor 904a and a second conductor 904b separated or branched by a slit 911. When the width of each of the first conductive wire 904a and the second conductive wire 904b is less than or equal to 2δ, the gap between the winding lines 904_1 to 904_13 is reduced compared to the comparative example to improve the quality coefficient and to improve the coil pattern 904. The occupied area can be minimized, making the product compact. As such, even if the distance between the winding lines 904_1 to 904_13 decreases, the AC resistance does not increase, thereby suppressing the AC resistance.

According to the wireless charging coil module 900 according to the first embodiment, each of the coil pattern 904 includes a first conductor 904a and a second conductor 904b separated or branched by a slit 911. Since the width of each of the first conductive wire 904a and the second conductive wire 904b is less than or equal to 2δ, the distance between the winding lines 904_1 to 904_13 is reduced compared to the comparative example, thereby increasing the inductance with respect to the same area, resulting in a comparison with the same area. Can improve the quality factor.

Second Embodiment

In the second embodiment, each of the winding lines 904_1 to 904_13 of the coil pattern 904 has a slit between the first lead 904a, the second lead 904b, and the first lead 904a and the second lead 904b. Inclusion of 911 is the same as the first embodiment, but differs from the first embodiment in that the widths of the winding lines 904_1 to 904_13 of the coil pattern 904 are different.

For example, in the winding lines 904_1 to 904_13 of the coil pattern 904, the width W of each of the first conductive line 904a and the second conductive line 904b of some of the winding lines is greater than or equal to 2δ and the other of the other winding lines. The width W of each of the first conductive line 904a and the second conductive line 904b may be 2δ or less.

As an example, the winding line having a width of 2δ or more may be disposed near the outer side of the coil pattern 904. For example, the width W of each of the first conductive line 904a and the second conductive line 904b of each of the remaining winding lines except for the first winding line 904_1, that is, the second to thirteenth winding lines 904_2 to 904_13 may be It may be 2δ or more.

As another example, a winding line having a width of 2δ or more may be disposed between the first winding line 904_1 and the thirteenth winding line 904_13, but is not limited thereto.

More specifically, the width W of each of the two to five winding lines among the winding lines 904_1 to 904_13 of the coil pattern 904 is greater than or equal to 2δ, and the width W of each of the remaining winding lines is less than or equal to 2δ. Can be. For example, the width W of each of the second winding line 904_2 to the fourth winding line 904_4 is greater than or equal to 2δ, and the width W of each of the first winding line 904_1 and the fifth to thirteenth winding lines 904_13 ( W) may be 2δ or less.

An example of the standard of the coil pattern 904 according to the second embodiment may be shown in Table 4.

제1 권선라인(904_1)First winding line 904_1	900㎛900 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제2 권선라인(904_2)Second winding line 904_2	1,000㎛1,000 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제3 권선라인(904_3)Third winding line 904_3	1,000㎛1,000 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제4 권선라인(904_4)Fourth winding line 904_4	1,000㎛1,000 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제5 권선라인(904_5)Fifth winding line 904_5	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제6 권선라인(904_6)Sixth winding line 904_6	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제7 권선라인(904_7)Seventh winding line 904_7	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제8 권선라인(904_8)Eighth winding line 904_8	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제9 권선라인(904_9)9th winding line 904_9	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제10 권선라인(904_10)Tenth winding line 904_10	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제11 권선라인(904_11)Eleventh winding line 904_11	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제12 권선라인(904_12)Twelfth Winding Line 904_12	950㎛950 ㎛
권선라인 사이 간격 Spacing between winding lines	150㎛150 μm
제13 권선라인(904_13)Thirteenth winding line 904_13	950㎛950 ㎛

The interval between the slits is 150 μm and the width of each of the first conductive line 904a and the second conductive line 904b of each of the winding lines 904_1 to 904_13 may be the same. In this case, each of the first and second

conductive wires

904a and 904b of the first winding line 904_1 may have a width of 375 μm. A width of each of the first conductive line 904a and the second conductive line 904b of each of the second to fourth winding lines 904_2 to 904_4 may be 425 μm. Each of the first and second

conductive lines

904a and 904b of the fifth to thirteenth winding lines 904_5 to 904_13 may have a width of 400 μm. Previously, when considering the process error due to the process by the etching method of the rolled steel sheet, 2δ has been set to 400㎛. From this, the width of each of the first and second

conductive wires

904a and 904b of the second to fourth winding lines 904_2 to 904_4 is greater than or equal to 2δ, whereas the first and fifth to thirteenth winding lines 904_1 Each of the first and second

conductive wires

904a and 904b 904_5 to 904_13 may have a width of 2δ or less.

The coil pattern 904 standard used in the experiment may be shown in Table 5. The shield 907 may consist of four layers and have a shielding rate of 1400.

	비교예Comparative example	제2 실시예Second embodiment
Line width(㎛)Line width (㎛)	800800	900~1000900-1000
Line space(㎛)Line space (㎛)	350350	150150
Line pitch(㎛)Line pitch (㎛)	11501150	11001100
Coil 외경(mm)Coil Outer Diameter (mm)	48.248.2	48.248.2
Coil 내경(mm)Coil Inner Diameter (mm)	1919	19.719.7
턴수Turns	1313	1313

In the coil pattern 904 specification of the second embodiment shown in Table 5, the specific specification of the width of each winding line 904_1 to 904_13 and the spacing between each winding line 904_1 to 904_13 is already shown in Table 4. There is a bar. The measured values in the bare coil structure of the coil pattern 904 according to the embodiment may be shown in Table 6.

L(μH)L (μH)	6.326.32
Rac(Ω)Rac (Ω)	0.30.3
Rdc(Ω)Rdc (Ω)	0.2950.295
QQ	16.9416.94
Rac/RdcRac / Rdc	1.021.02

As shown in Table 6, in the bare coil structure, the inductance L measured at the coil pattern 904 is 6.32, the AC resistance Rac is 0.3Ω, the DC resistance Rdc is 0.295Ω, and the quality factor (Q) is 16.94, and the ratio of AC resistance to DC resistance (Rac / Rdc) may be 1.02. By the measured value in this bare coil structure, the inductance L can be larger than in the related art. In particular, it can be seen that the quality factor Q is significantly increased compared with the conventional art. In addition, the ratio of AC resistance and DC resistance (Rac / Rdc) was measured at about 2%, and when the coil pattern 904 is designed as shown in Tables 4 and 5, the effects of the skin effect and the proximity effect were remarkable. It can be seen that the decrease. Figure 9a shows the resistance and inductance according to the width of the winding line in the structure with the shield attached to the coil pattern, Figure 9b shows the resistance ratio and quality factor according to the width of the winding line in the structure with the shield attached to the coil pattern. do. The data shown in FIGS. 9A and 9B show measured values obtained by experiments in a situation where a shielding material 907 as well as a coil pattern 904 is provided.

As shown in Fig. 9A, the inductance of the comparative example was 9.69 µH, while the inductance of the second example was 10.9 µH, which was 12.48% or more larger than that of the comparative example. The DC resistance of the comparative example is 0.491Ω, whereas the DC resistance of the second embodiment is smaller, 0.308Ω. Similarly, the AC resistance of the comparative example is 0.65Ω, while the AC resistance of the second embodiment is smaller, 0.414Ω.

From this, it can be seen that in the wireless charging coil module according to the second embodiment, the inductance is larger and the DC resistance and the AC resistance are smaller than those of the comparative example.

As shown in FIG. 9B, the quality factor of the comparative example is 11.99, whereas the quality factor of the second example is 21.27, which is 77.4% higher than that of the comparative example. Accordingly, the maximum quality factor can be secured, and the power transmission efficiency can be significantly improved.

According to the wireless charging coil module according to the second embodiment, the first conductive line 904a and the second in which some of the winding lines 904_1 to 904_13 of the coil pattern 904 are separated or branched by the slit 911. By including the conducting wire 904b and the width of each of the second conducting wire 904b and the second conducting wire 904b being less than or equal to 2δ, the DC resistance (or AC resistance) becomes small and the inductance becomes large, which is represented by Equation 1. As can be seen, the quality factor can be significantly improved.

According to the wireless charging coil module according to the second embodiment, the first conductive line 904a and the second in which some of the winding lines 904_1 to 904_13 of the coil pattern 904 are separated or branched by the slit 911. By including the conductive wire 904b and the width of each of the second conductive wire 904b and the second conductive wire 904b to be less than or equal to 2δ, the spacing between the winding lines 904_1 to 904_13 is reduced compared to the comparative example to improve the quality factor. It is possible to improve and to minimize the occupied area occupied by the coil pattern 904, which makes the product compact. As such, even if the distance between the winding lines 904_1 to 904_13 decreases, the AC resistance does not increase, thereby suppressing the AC resistance.

According to the wireless charging coil module according to the second embodiment, the first conductive line 904a and the second in which some of the winding lines 904_1 to 904_13 of the coil pattern 904 are separated or branched by the slit 911. By making the conductive wire 904b included and the width of each of the second conductive wire 904b and the second conductive wire 904b being less than or equal to 2δ, the spacing between the winding lines 904_1 to 904_13 is reduced compared to the comparative example to provide the same area. Inductance is increased, which in turn can improve the quality factor for the same area.

Third Embodiment

The third embodiment consists solely of the coil pattern 904, except that the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 is a specific multiple of the skin depth. Same as the example. In the third embodiment, the same components as those of the first and second embodiments are denoted by the same reference numerals and detailed description thereof will be omitted. The description omitted below can be easily understood from the description of the first and second embodiments.

10A is a plan view illustrating the wireless charging coil module according to the third embodiment, and FIG. 10B is a cross-sectional view illustrating the wireless charging coil module according to the third embodiment.

10A and 10B, the wireless charging coil module 920 according to the third embodiment may include a film 901,

wireless charging coils

903 and 906, a shielding material 907, and a heat dissipating material 909. Can be.

The wireless charging coils 903 and 906 may be disposed on the film 901, and the shielding material 907 and the heat dissipating material 909 may be sequentially disposed below the film 901.

The wireless charging coils 903 and 906 may include a coil part 903 including a hollow part 906 positioned at the center and a coil pattern 904 surrounding the hollow part 906.

In the third embodiment, the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 may be 4δ to 5δ. An interval between each winding line 904_1 to 904_13 may be 150 μm or less.

By the coil pattern 904 according to the third embodiment, the ratio (Rac / Rdc) of the AC resistance and the DC resistance may be within 15%.

By the coil pattern 904 according to the third embodiment, the ratio (Rac / Rdc) of the AC resistance and the DC resistance may be within 10%.

By the coil pattern 904 according to the third embodiment, the ratio (Rac / Rdc) of the AC resistance and the DC resistance may be within 5%.

On the other hand, when the shielding material 907 is disposed on one side of the coil patterns 904 of the wireless charging coils 903 and 906, the ratio of AC resistance and DC resistance (Rac / Rdc) is affected by the shielding material 907. Only 904 may be different than if disposed. The structure in which only the coil pattern 904 is disposed may be referred to as a bare coil structure, and the structure formed by combining the coil pattern 904 and the shielding material 907 may be referred to as a structure in which a shielding material is attached to the coil pattern. .

For example, in the structure in which the shielding material is attached to the coil pattern, the ratio (Rac / Rdc) of the AC resistance and the DC resistance may be 70% or less. For example, in the structure in which the shielding material is attached to the coil pattern, a ratio (Rac / Rdc) of AC resistance and DC resistance may be 50% or less.

In the structure in which the shielding material is attached to the coil pattern, the inductance L may be 10.5 μH or more. In the structure in which the shielding material is attached to the coil pattern, the inductance L may be 11 μH or more.

In the bare coil structure, the quality factor Q may be 16 or more. In the bare coil structure, the quality factor Q may be 18 or more.

Unlike this, in the structure in which the shielding material is attached to the coil pattern, the quality factor Q may be 20 or more. The quality factor Q may be increased more in the structure in which the shielding material is attached to the coil pattern than in the bare coil structure.

The coil pattern 904 standard used in the experiment may be shown in Table 7. The shield 907 may consist of four layers and have a shielding rate of 1400.

	비교예Comparative example	실험예1Experimental Example 1	실험예2Experimental Example 2	실험예3Experimental Example 3	실험예4 Experimental Example 4	실험예5Experimental Example 5	실험예6Experimental Example 6
Line width(㎛)Line width (㎛)	800800	185185	370370	555555	740740	800800	925925
Line space(㎛)Line space (㎛)	350350	965965	780780	595595	410410	350350	225225
Line pitch(㎛)Line pitch (㎛)	11501150	11501150	11501150	11501150	11501150	11501150	11501150
Coil 외경(mm)Coil Outer Diameter (mm)	48.248.2	48.248.2	48.248.2	48.248.2	48.248.2	48.248.2	48.248.2
Coil 내경(mm)Coil Inner Diameter (mm)	1919	1919	1919	1919	1919	1919	18.2218.22
턴수Turns	1313	1313	1313	1313	1313	1313	1313

Experimental Example 1 has a width of each of the winding lines 904_1 to 904_13 is 1δ, Experimental Example 2 has a width of 2 δ of each of the winding lines 904_1 to 904_13, and Experimental Example 3 shows a width of each of the winding lines 904_1 to 904_13. The width is 3 δ. Experimental Example 4 has a width of 4δ of each winding line 904_1 to 904_13, Experimental Example 5 has a width of 4.3δ of each winding line 904_1 to 904_13, and Experimental Example 6 shows a width of each of the winding lines 904_1 to 904_13. The width may be 5δ. The measured values in the bare coil structure of the coil pattern 904 according to the embodiment may be shown in Table 8.

	실험예1Experimental Example 1	실험예2Experimental Example 2	실험예3Experimental Example 3	실험예4 Experimental Example 4	실험예5Experimental Example 5	실험예6Experimental Example 6
L(μH)L (μH)	6.456.45	6.326.32	6.236.23	6.176.17	6.196.19	6.116.11
Rac(Ω)Rac (Ω)	1.1781.178	0.5560.556	0.3830.383	0.3040.304	0.2810.281	0.2610.261
Rdc(Ω)Rdc (Ω)	1.1881.188	0.5620.562	0.3810.381	0.2890.289	0.2590.259	0.2270.227
QQ	4.404.40	9.149.14	13.0813.08	16.3216.32	17.7217.72	18.8318.83
Rac/RdcRac / Rdc	0.990.99	0.990.99	1.011.01	1.051.05	1.081.08	1.151.15

As shown in Table 8, the quality factor was more than 16 in Experimental Examples 4 to 6 in the bare coil structure. From this, the quality factor of the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 was increased from 4δ to 5δ. 11A shows the resistance and inductance according to the width of the winding line in the structure with the shield attached to the coil pattern, and FIG. 11B shows the resistance ratio and the quality factor according to the width of the winding line in the structure with the shield attached to the coil pattern. do. The data shown in FIGS. 11A and 11B show measured values obtained by experiments in a situation where a shielding material 907 as well as a coil pattern 904 is provided.

As shown in FIG. 11A, it can be seen that the inductance of Experimental Examples 1 to 6 is larger than that of the comparative example. In Experimental Examples 3 to 6, it can be seen that the DC resistance is smaller than the DC resistance of the comparative example, and the AC resistance is also smaller than the AC resistance of the comparative example.

As shown in FIG. 11B, except for Experimental Example 1, all of the other Experimental Examples, that is, Experimental Examples 2 to 6, the quality coefficient of the comparative example was larger than that of the comparative example. The quality coefficients in Experimental Examples 4 to 6 were remarkably improved, and among them, the highest quality coefficient was obtained in Example 5 (the width of the winding line was 4.3δ). For example, the quality coefficient of Experimental Example 4 was improved by 68.9% compared to the Comparative Example. For example, the quality factor of Experimental Example 5 was improved by 76% compared to the comparative example. For example, the quality factor of Experimental Example 6 is improved by 70% compared to the comparative example. From this, in the third embodiment, when the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 is 4δ to 5δ, the maximum quality factor can be secured, so that the power transmission efficiency can be remarkably improved. Can be.

According to the wireless charging coil module 920 according to the third embodiment, by setting the width of each coil pattern 904 to 4δ to 5δ, the DC resistance (or AC resistance) is reduced and the inductance is increased to be represented by Equation (1). As can be seen, the quality factor can be significantly improved.

According to the wireless charging coil module 920 according to the third embodiment, the width of each coil pattern 904 to 4δ to 5δ, the interval between the winding lines 904_1 to 904_13 is reduced compared to the comparative example to improve the quality coefficient In this case, the area occupied by the coil pattern 904 can be minimized, thereby making the product compact. As such, even if the distance between the winding lines 904_1 to 904_13 decreases, the AC resistance does not increase, thereby suppressing the AC resistance.

According to the wireless charging coil module 920 according to the third embodiment, by the width of each coil pattern 904 to 4δ to 5δ, the spacing between the winding lines 904_1 to 904_13 is reduced compared to the comparative example, the inductance compared to the same area Can be increased to improve the quality factor for the same area.

Fourth Example

The fourth embodiment is the same as the second embodiment except that the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 increases toward the outside from the center of the coil unit 903. In the fourth embodiment, the same components as those of the first to third embodiments are denoted by the same reference numerals and detailed description thereof will be omitted. The description omitted below can be easily understood from the description of the first to third embodiments.

12A is a plan view illustrating a wireless charging coil module according to a fourth embodiment, and FIG. 12B is a cross-sectional view illustrating a wireless charging coil module according to a fourth embodiment.

12A and 12B, the wireless charging coil module 930 according to the fourth embodiment may include a film 901,

wireless charging coils

In the fourth exemplary embodiment, among the first to thirteenth winding lines 904_1 to 904_13 included in the coil pattern 904, the first conductive wire 904a and the second conductive wire separated by the slit 911 in some winding lines ( 904b) may be included.

The coil unit 903 may include a first connection part 915a and a second connection part 915b. The first connection part 915a connects the first conductive line 904a and the second conductive line 904b in one region of the seventh winding line 904_7 that meets the end of a specific winding line, for example, the sixth winding line 904_6. Can give The second connector 915b may connect the first conductive line 904a and the second conductive line 904b in one region of the thirteenth winding line 904_13 adjacent to the second terminal 905b.

In such a coil pattern structure, for example, the width of each of the first to sixth winding lines 904_1 to 904_6 not including the first conductive line 904a and the second conductive line 904b is 4δ to 5δ, and the seventh to seventh layers. A width of each of the first conductive line 904a and the second conductive line 904b included in each of the 13 winding lines 904_7 to 904_13 may be 2δ or less. The interval between the first conductive line 904a and the second conductive line 904b included in each of the seventh to thirteenth winding lines 904_7 to 904_13, that is, the width of the slit 911, is the first to sixth winding line 904_1. The distance between the adjacent coil patterns 904 and 904_6 may be equal to or smaller than the distance between the adjacent coil patterns 904. For example, when the distance between the coil patterns 904 adjacent to each other between the first to sixth winding lines 904_1 to 904_6 is 150 μm, the first conductive line included in each of the seventh to thirteenth winding lines 904_7 to 904_13 ( An interval between 904a and the second conductive wire 904b may be 150 μm or less.

In addition, the width thereof may increase from the first winding line to the sixth winding lines 904_1 to 904_6. As the seventh to thirteenth winding lines 904_7 to 904_13 extend, the width of each of the first and second

conductive lines

904a and 904b included in each of the seventh to thirteenth winding lines 904_7 to 904_13 increases. Can be. For example, the width of the first conductive line 904a of the eighth winding line 904_8 may be greater than the width of the first conductive line 904a of the seventh winding line 904_7. For example, the width of the first conductive line 904a of the tenth winding line 904_10 may be greater than the width of the first conductive line 904a of the ninth winding line 904_9. Similarly, the width of the second lead 904b of the eighth winding line 904_8 may be greater than the width of the second lead 904b of the seventh winding line 904_7. For example, the width of the second conductive line 904b of the tenth winding line 904_10 may be greater than the width of the second conductive line 904b of the ninth winding line 904_9.

The width of the first conductive line 904a and the width of the second conductive line 904b of each of the seventh to thirteenth winding lines 904_7 to 904_13 may be the same, but is not limited thereto.

According to the wireless charging coil module 930 according to the fourth embodiment, some of the winding lines 904_1 to 904_13 of the coil pattern 904 are connected to the first conductive wire 904a and the second conductive wire by the slit 911. 904b and the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 increases toward the outside from the center of the coil portion 903, so that the DC resistance (or AC resistance) becomes small. As the inductance increases, the coefficient of quality can be remarkably improved as shown in Equation (1).

According to the wireless charging coil module 930 according to the fourth embodiment, some of the winding lines 904_1 to 904_13 of the coil pattern 904 are connected to the first conductive wire 904a and the second conductive wire by the slit 911. 904b, and the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 increases toward the outside from the center of the coil unit 903, so that the gap between the winding lines 904_1 to 904_13 is increased. It can be reduced compared to the comparative example to improve the quality factor and to minimize the occupied area occupied by the coil pattern 904, which makes the product compact. As such, even if the distance between the winding lines 904_1 to 904_13 decreases, the AC resistance does not increase, thereby suppressing the AC resistance.

According to the wireless charging coil module 930 according to the fourth embodiment, some of the winding lines 904_1 to 904_13 of the coil pattern 904 are connected to the first conductive wire 904a and the second conductive wire by the slit 911. 904b, and the width of each of the winding lines 904_1 to 904_13 included in the coil pattern 904 increases toward the outside from the center of the coil unit 903, so that the gap between the winding lines 904_1 to 904_13 is increased. As compared with the comparative example, it is reduced, and thus the inductance to the same area is increased, thereby improving the quality factor compared to the same area.

Fifth Embodiment

The fifth embodiment is the same as the first embodiment except that at least one connection line 917 is provided which electrically connects the separated first and

second leads

904a and 904b. In the fifth embodiment, the same components as those in the first to fourth embodiments will be denoted by the same reference numerals and detailed description thereof will be omitted. The description omitted below can be easily understood from the description of the first to fourth embodiments.

Referring to FIG. 13, the wireless charging coil module 940 according to the fifth embodiment may include a film 901,

wireless charging coils

903 and 906, a shielding material 907, and a heat dissipating material 909.

Each of the coil patterns 904 may include a first conductive line 904a, a second conductive line 904b, and a slit 911. The first wire 904a and the second wire 904b may be separated by the slit 911.

The coil unit 903 may include first and

second connection parts

913a and 913b electrically connecting the first and second

conductive wires

904a and 904b on one side and the other side thereof. The first connector 913a may be located adjacent to the first terminal 905a, and the second connector 913b may be located adjacent to the second terminal 905b.

As another example, the first connector 913a may be included in the first terminal 905a, and the second connector 913b may be included in the second terminal 905b.

The coil unit 903 may include at least one connection line 917 for electrically connecting the first conductive line 904a and the second conductive line 904b. The connection line may be integrally formed with the first conductive line 904a and the second conductive line 904b. The connection line may be disposed across the slit 911. Connection lines may be arranged at regular intervals, but is not limited thereto. For example, as shown in FIG. 13, the first connection line connecting the first conductive line 904a and the second conductive line 904b of each coil pattern 904 along the 2 o'clock direction and the 5 o'clock direction as shown in FIG. Accordingly, a second connection line connecting the first conductive line 904a and the second conductive line 904b of each coil pattern 904, and the first conductive line 904a and the second conductive line of each coil pattern 904 along the 7 o'clock direction. A third connection line connecting the conductive line 904b and a fourth connection line connecting the first conductive line 904a and the second conductive line 904b of each coil pattern 904 along the 10 o'clock direction may be included.

The connection line may be referred to as a bridge.

The slits of each coil pattern 904 may be divided into at least one or more slits by at least one or more connection lines. For example, when the tenth winding line 904_10 includes three connection lines, four slits may be formed by the three connection lines.

When the first conductive wire 904a and the second conductive wire 904b are separated from each other by the slit 911 of each coil pattern 904, the radius of rotation of each of the first conductive wire 904a and the second conductive wire 904b is different. Therefore, the phase difference of AC power is generated. In particular, this phase difference becomes even larger in the high frequency region.

According to the fifth embodiment, when each coil pattern 904 is separated into the first conductive wire 904a and the second conductive wire 904b by the slit 911, the first conductive wire 904a is formed by at least one connection line. ) And the second conductive line 904b can be suppressed from generating a phase difference of AC power.

According to the wireless charging coil module 940 according to the fifth embodiment, the coil pattern 904 is separated into the first conductive wire 904a and the second conductive wire 904b by the slit 911 and connected to one or more connection lines. By connecting the first conductive wire 904a and the second conductive wire 904b, the DC resistance (or AC resistance) is reduced and the inductance is increased, so that the quality coefficient can be remarkably improved.

According to the wireless charging coil module 940 according to the fifth embodiment, the distance between the winding lines 904_1 to 904_13 is compared by connecting the first conductive wire 904a and the second conductive wire 904b by one or more connection lines. Compared with the example, the quality factor is improved and the occupied area occupied by the coil pattern 904 can be minimized, thereby making the product compact. As such, even if the distance between the winding lines 904_1 to 904_13 decreases, the AC resistance does not increase, thereby suppressing the AC resistance.

According to the wireless charging coil module 940 according to the fifth embodiment, the distance between the winding lines 904_1 to 904_13 is compared by connecting the first conductive wire 904a and the second conductive wire 904b by one or more connection lines. It can be reduced compared to the example, and the inductance to the same area is increased, thereby improving the quality factor for the same area.

As shown in FIG. 14, the conductor 1201, the adhesive layer 1700, and the film 1800 may be prepared.

In one embodiment, the conductor 1201 may be formed of copper or an alloy including copper. Copper may be used in the form of a rolled foil, an electrolytic foil. The conductor 1201 may have various thicknesses depending on the specifications of the required product. In an embodiment, the thickness of the conductor 1201 may be 150 μm or less, but this is only an example. According to an exemplary embodiment, the thickness of the conductor 1201 may be 120 μm.

The adhesive layer 1700 is used to reinforce the adhesive force between the conductor 1201 and the film 1800, and a thermosetting resin may be used, but is not limited thereto. The thickness of the adhesive layer 1700 may be 17 μm, but this is only an example.

The film 1800 serves to protect the conductor 1201 in a process in which the conductor 1201 forms a constant conductive pattern. Specifically, the film 1800 may protect the conductor 1201 to support the conductor 1201 to form a predetermined conductive pattern in an etching process to be described later.

In an embodiment, the film 1800 may be a polyimide (PI) film or a polyethylene terephthalate (PET) film, but is not limited thereto.

As shown in FIG. 15, the conductor 1201 and the film 1800 may be attached through the adhesive layer 1700. The attachment may be a laminating process. The laminating process is a process of bonding materials of different materials by applying predetermined heat and pressure.

As illustrated in FIG. 16, a photosensitive film 1900 may be attached to an upper surface of the conductor 1201. The photosensitive film 1900 is used to form a constant conductive pattern by etching the conductor 1201, and a film of UV exposure type or LDI exposure type may be used. In another embodiment, a photosensitive coating liquid may be applied to the upper surface of the conductor 1201 instead of the photosensitive film 1900.

As illustrated in FIG. 17, the photosensitive film 1900 may be exposed and developed to form a mask pattern 1910.

The mask pattern 1910 may be formed on an upper surface of a position where a predetermined conductive pattern is to be formed through the exposure and development processes.

Exposure means irradiating light to the photosensitive film 1900 by dividing a portion where a conductive pattern is to be formed from a portion where a conductive pattern is not to be formed. That is, exposure is a process of irradiating light to the part in which a conductive pattern is not formed. The development means a process of removing a portion irradiated with light by exposure.

The mask pattern 1910 may be formed at a portion where the coil part (see 903 of the first to fifth embodiments) is to be formed by the exposure and development processes. A portion of the conductor 1201 exposed by the mask pattern 1910 may be etched.

As illustrated in FIG. 18, the conductor 1201 corresponding to a portion where the mask pattern 1910 is not formed may be etched through an etching process. Etching is a process of etching and removing the conductor 1201 in a portion where the mask pattern 1910 is not formed by using a material that chemically reacts with the conductor 1201 in the portion where the mask pattern 1910 is not formed. it means. In one embodiment, the conductor 1201 may be patterned by wet or dry etching.

As shown in FIG. 19, the mask pattern 1910 is removed, whereby the coil portion 903 including the coil patterns (see 904 of the first to fifth embodiments) and the first and

second terminals

905a and 905b. This can be formed.

Hereinafter will be described a wireless charging coil module capable of optimal design that can improve the quality factor.

Sixth Example

20 is a plan view illustrating a wireless charging coil module according to a sixth embodiment, FIG. 21 is an enlarged view of region A of FIG. 20, and FIG. 22 is an enlarged view of region B of FIG. 20. In addition, Figure 23 is a cross-sectional view taken along the X-Y line in the wireless charging coil module shown in FIG.

20 to 23, the wireless charging coil module 2000 according to the sixth embodiment may include a film 2001. The film 2001 may serve as a substrate for forming the wireless charging coil 2002. In addition, the film 2001 may protect and support the wireless charging coil 2002. The film 2001 may be formed of a thin material and a flexible material. In detail, the film 2001 may be polyimide (PI) or polyethylene terephthalate (PET). The film 2001 may be formed above or below the wireless charging coil 2002. The film 2001 may be formed both above and below the wireless charging coil 2002.

The wireless charging coil module 2000 according to the sixth embodiment may include a shielding material 2007. The shielding material 2007 may shield the electromagnetic field of the wireless charging coil 2002. The shielding material 2007 may include, for example, a ferrite material or a ribbon material, but is not limited thereto. The shielding material 2007 may support the wireless charging coil 2002. The area of the shielding material 2007 may be equal to or larger than that of the wireless charging coil 2002.

The shielding material 2007 may be disposed under the film 2001. The shielding material 2007 may be attached to the film 2001 using an adhesive (not shown). Since the adhesive is very thin, the shield 2007 may be considered to be in contact with the bottom surface of the film 2001. The adhesive may be made of a material having excellent heat dissipation performance and insulation properties.

The wireless charging coil module 2000 according to the sixth embodiment may include a heat dissipation 2009. The heat dissipation member 2009 may be disposed under the shielding material 2007. The heat dissipation member 2009 may be attached to the shielding material 2007 using an adhesive (not shown). The heat dissipation member 2009 may be in contact with the bottom surface of the shielding member 2007. The heat radiator 2009 may be made of a metal material. For example, the heat dissipation member 2009 may include copper (Cu), but is not limited thereto.

Although not shown, one or more heat dissipators 2009 may be disposed inside the shield 2007. In this case, the heat dissipation member 2009 may be particles or beads having a plate shape or excellent heat dissipation characteristics.

Although not shown, one or more shields 2007 may be disposed inside the heat shield 2009.

The heat dissipation member 2009 may support the wireless charging coil 2002 and the shielding material 2007. The heat dissipation member 2009 may release heat generated from the wireless charging coil 2002 to the outside. The greater the thickness of the heat dissipation member 2009, the better the heat dissipation performance. However, since the volume of the wireless charging coil module 2000 increases in proportion to the thickness, optimization of the thickness of the heat dissipation member 2009 is required. For example, the thickness of the heat dissipation member 2009 may be 2 to 5 times thicker than the thickness of the shielding material 2007.

The heat dissipation member 2009 may be selectively adopted according to the heat generation state of the wireless charging coil module 2000. For example, when heat generation of the wireless charging coil module 2000 does not occur, the heat dissipation member 2009 may be omitted.

The wireless charging coil module 2000 according to the sixth embodiment may include a wireless charging coil 2002. The wireless charging coil 2002 is a member for receiving wireless power from the wireless power transmitter, and may be, for example, the first antenna 810 illustrated in FIG. 6, but is not limited thereto.

In a sixth embodiment, the wireless charging coil 2002 may include a winding portion (2003). In the sixth embodiment, the wireless charging coil 2002 may include a hollow portion 2006 surrounded by the winding portion 2003. The winding part 2003 may be disposed on an upper surface of the film 2001. Although not shown, the winding part 2003 may be directly disposed on the upper surface of the shielding material 2007.

The first terminal 2005a may be disposed on one side of the winding portion 2003, that is, the hollow portion 2006 adjacent to the inside of the winding portion 2003. The second terminal 2005b may be disposed on the other side of the winding part 2003, that is, an area adjacent to the outside of the winding part 2003.

Although not shown, the wireless charging coil 2002 may include a connection member connected to the first terminal 2005a adjacent to the hollow portion 2006 and extending outward of the coil pattern 2004 across the coil pattern 2004. Can be. The connection member extending outward of the coil pattern 2004 may be connected to a connection terminal disposed adjacent to the second terminal 2005b. An insulating layer may be disposed between the connecting member and the coil pattern 2004 to prevent an electrical short between the connecting member and the coil pattern 2004. The connection member may be formed of the same metal material as the coil pattern 2004, but is not limited thereto.

For example, one side of the winding unit 2003 may be connected to the first terminal 2005a, and the other side of the winding unit 2003 may be connected to the second terminal 2005b. The winding part 2003 may be wound a plurality of times. The winding direction of the winding part 2003 may be clockwise or counterclockwise. The winding part 2003, the first terminal 2005a, and the second terminal 2005b may be integrally formed. The winding part 2003, the first terminal 2005a, and the second terminal 2005b may be made of a metal material. Alternatively, after the first and

second terminals

2005a and 2005b are formed separately from the winding part 2003, the first and

second terminals

2005a and 2005b may be electrically connected to the winding part 2003 by a bonding process. The first and

second terminals

2005a and 2005b may be electrically connected to a circuit unit for supplying power. For example, when an AC voltage is applied to the first and

second terminals

2005a and 2005b, a current may flow in the coil pattern 2004 in a clockwise or counterclockwise direction periodically based on the hollow portion 2006.

In the sixth embodiment, the coil of the winding part 2003 may have a split structure. That is, the coil of the winding part 2003 may be divided (or separated) into the first-first conductive wire 2021a and the first-second conductive wire 2021b by the opening 2021c (opening). The opening 2021c may be referred to as a slit, crevice, hole, hole, or the like. The first-first conductive wire 2021a may be referred to as a first split, and the first-second conductive wire 2021b may be referred to as a second split.

When not having a split structure, the coil line width or diameter of the coil of the winding part 2003 may exceed 2δ. Here, δ may be the skin depth represented by Equation 3.

For example, when the wireless charging coil 2002 according to the embodiment is driven at an operating frequency f of 128 kHz, the skin depth δ may be 185 micrometers.

If the coil line width or diameter of the coil of the winding unit 2003 exceeds 2δ, the resistance component Ys due to the skin effect and / or the resistance component Yp due to the proximity effect are increased. That is, when the coil line width or diameter of the coil of the winding part 2003 exceeds 2δ, as shown in FIG. 1A, no current flows to the center region of the coil of the winding part 2003, which is a resistance component (Ys). ) Leads to an increase. In addition, when the coil of the winding part 2003 exceeds 2δ, as shown in FIG. 1B, current does not flow in close proximity to the surfaces facing each other in the coils adjacent to each other, which is caused by an increase in the resistance component Yp. Can lead to.

Therefore, in the sixth embodiment, the coil of the winding portion 2003 has a split structure so that the wire widths or diameters of the

conductive wires

2021a and 2021b of the coil are set to 2 δ or less, so that the resistance component Ys and / or due to the skin effect are obtained. The resistance component (Yp) due to the proximity effect can be reduced. As the resistance component (Ys) and / or the resistance component (Yp) due to the proximity effect is reduced, the AC resistance (Rac) is also reduced, thereby increasing the quality factor (Q), thereby improving charging efficiency.

On the other hand, even though the coil of the winding portion 2003 is divided into two

conductive wires

2021a and 2021b by one opening 2021c, even if the wire width or diameter of each of the

conductive wires

2021a and 2021b becomes 2δ or less, the winding portion 2003 A coil length of the winding part 2003, specifically, two

conductive wires

2021a and 2021b may increase along a direction from the inside of the winding part 2003 to the outside of the winding part 2003. When the coil length l of the winding part 2003 increases, as shown in Equation 4, the DC resistance R _dc increases.

From Equation 4, in order to suppress the increase in the DC resistance R _dc , the two

conductive wires

2021a and 2021b of the winding part 2003 are directed from the inside of the winding part 2003 to the outside of the winding part 2003. The cross-sectional area (S) of) must be increased.

Therefore, in the sixth embodiment, the line width or diameter of the coil of the winding part 2003 may increase in a direction from the inside of the winding part 2003 to the outside of the winding part 2003. That is, the line widths or diameters of the two

conductive wires

2021a and 2021b of the winding part 2003 may increase along a direction from the inside of the winding part 2003 to the outside of the winding part 2003.

When the line widths or diameters of the two

conductive wires

2021a and 2021b of the winding portion 2003 increase along the direction from the inside of the winding portion 2003 to the outside of the winding portion 2003, the inside of the winding portion 2003 is increased. From the specific point between the outer side of the winding portion 2003, the line width or diameter of the two

conductive wires

2021a, 2021b of the winding portion 2003 exceeds 2δ, and thus the resistance component Ys and / or the proximity due to the skin effect again. There arises a problem that the resistance component (Yp) is increased due to the effect. The specific point may be a point where the line width or diameter of the

conductive wires

2021a and 2021b of the winding part 2003 exceeds 2δ.

20 to 23, in order to solve this problem, the coil of the winding part 2003 between the outside of the winding part 2003 may have another split structure to solve this problem. That is, the coil of the winding part 2003 located between the inside of the winding part 2003 and the specific point has a first split structure, and the winding part 2003 located between the specific point and the outside of the winding part 2003 is provided. The coil of may have a second split structure. In the first split structure, the coil of the winding part 2003 may be divided into the first-first conductive wire 2021a and the first-second conductive wire 2021b by one opening 2021c. In the second split structure, the second split structure may be divided into the second-first conductive line 2022a, the second-two conductive line 2022b, and the second-three conductive line 2022c by the two

openings

2022d and 2022e.

The specific point is an area for connecting or connecting the first split structure and the second split structure, and may be a non-divided area 2023. The non-divided area 2023 may be referred to as an intermediate area, an intermediate area, a connection area, a joint area, or the like.

According to an embodiment, the coil of the winding portion 2003 between the inside of the winding portion 2003 and the specific point has a first split structure, and the coil of the winding portion 2003 between the specific point and the outside of the winding portion 2003 has a first split structure. Since the coil has a second split structure, the line width or diameter of the conducting wire of the coil of the winding part 2003 between the specific point and the outside of the winding part 2003 is also less than or equal to 2δ so that the resistance component Ys and The quality factor Q may be improved due to the reduction of the AC resistance _Rac by reducing the resistance component Yp due to the proximity effect.

The winding part 2003 may include a first winding part 2021 and a second winding part 2022 that are spirally wound. The second winding part 2022 may surround the first winding part 2021. The winding direction of the first winding unit 2021 and the winding direction of the second winding unit 2022 may be the same. For example, the winding direction of the first winding unit 2021 and the winding direction of the second winding unit 2022 may be counterclockwise.

For example, the first winding part 2021 may be wound m times. One side of the first winding part 2021 may be connected to the first terminal 2005a. For example, the second winding part 2022 may be wound n times. One side of the second winding unit 2022 may be connected to the other side of the first winding unit, and the other side of the second winding unit 2022 may be connected to the second terminal 2005b. For example, m may be greater than n. That is, the first winding part 2021 may be wound more than the second winding part 2022. For example, the windings 2003 may have 13 turns or less. For example, the first winding portion 2021 may have six turns, and the second winding portion 2022 may have six turns. For example, the first winding unit 2021 may have a 20th turn, and the second winding unit 2022 may have 4 turns.

The first winding part 2021 may be positioned in the first divided area 2030 between the first terminal 2005a and the non-divided area 2023 to have a first split structure. The second winding part 2022 may be positioned in the second divided area 2031 between the non-divided area 2023 and the second terminal 2005b to have a second split structure. The first winding part 2021, the non-dividing area 2023, and the second winding part 2022 may be integrally formed. The first terminal 2005a, the first winding part 2021, the non-dividing area 2023, the second winding part 2022, and the second terminal 2005b may be integrally formed.

The first winding part 2021 may include the first-first conductive wire 2021a and the first-second conductive wire 2021b divided by one opening 2021c. The first-first conductive wire 2021a and the first-second conductive wire 2021b may be commonly connected to the first terminal 2005a. The first-first conductive wire 2021a and the first-second conductive wire 2021b may be commonly connected to the non-divided area 2023.

The second winding part 2022 may include a 2-1 lead wire 2022a, a 2-2 lead wire 2022b, and a 2-3 lead wire 2022c divided by two

openings

2022d and 2022e. have. The first opening 2022d divides the second-conducting wire 2022a and the second-two conducting wire 2022b, and the second opening 2022e opens the second-two conducting wire 2022b and the second-3. It may be divided into the conductive wire 2022c. The 2-1 conductive wire 2022a, the 2-2 conductive wire 2022b, and the 2-3 conductive wire 2022c may be commonly connected to the non-divided area 2023. The 2-1th conductive wire 2022a, the 2-2nd conductive wire 2022b, and the 2-3rd conductive wire 2022c may be commonly connected to the second terminal 2005b.

As shown in FIG. 23, the first divided area 2030 is an area formed by the first split structure of the first winding part 2021 wound between the first terminal 2005a and the non-divided area 2023. Can be. The second divided area 2031 may be an area formed by the second split structure of the second winding part 2022 wound between the non-divided area 2023 and the second terminal 2005b. That is, in the first division area 2030, the coil of the first winding part 2021 has m times of the 1-1 lead wire 2021a and the 1-2 lead wire 2021b divided by one opening 2021c. Can be wound. One side of the first-first conductive wire 2021a and the first-second conductive wire 2021b may be commonly connected to the first terminal 2005a, and the other side may be commonly connected to the non-divided region 2023. In the second division area 2031, the coil of the second winding part 2022 may include the second-first conductive wire 2022a and the second-second conductive wire 2022a divided by the first opening 2022d and the second opening 2022e. 2022b) and the second and third conductive wires 2022c may be wound n times. The 2-1 conductive wire 2022a, the 2-2 conductive wire 2022b, and the 2-3 conductive wire 2022c may be commonly connected to the non-divided area 2023 and the other side may be commonly connected to the second terminal 2005b. .

The line width W1 of the coil of the first winding part 2021 includes the line width w11 of the first-first conductor 2021a, the line width w12 of the first-two conductor 2021b, and the first-first conductor 2021a. ) And the distance d1 between the first and second conductive lines 2021b. An interval d1 between the first-first conductive line 2021a and the first-second conductive line 2021b may be the width of the opening 2021c. The line width w11 of the first-first conductive wire 2021a and the line width w12 of the first-second conductive wire 2021b may be the same. The line width w11 of the first-first conducting wire 2021a and the line width w12 of the first-first conducting wire 2021b are the distance d1 between the first-first conducting wire 2021a and the first-second conducting wire 2021b. May be greater than).

The line width W2 of the coil of the second winding part 2022 includes the line width w21 of the 2-1 lead wire 2022a, the line width w22 of the 2-2 lead wire 2022b, and the second-3 lead wire 2022c. ), The line width w23, the interval d21 between the 2-1st conductor 2022a and the 2-2nd conductor 2022b, and between the 2-2nd conductor 2022b and the 2nd-3rd conductor 2022c It can be the sum of the intervals d22. The line width of one of the 2-1 lead wires 2022a, the 2-2 lead wires 2022b, and the 2-3 lead wires 2022c may be different from that of the other wire. For example, the line width w22 of the second-conductor wire 2022b may be smaller than the line width w21 of the second-conductor wire 2022a or the line width w23 of the second-conductor wire 2022b.

The line width W2 of the coil of the second winding unit 2022 may be larger than the line width W1 of the coil of the first winding unit 2021. Line widths w11 and w12 of the first-first conductive wire 2021a or the first-second conductive wire 2021b of the first winding part 2021 may correspond to the second-first conductive wire 2022a of the second winding part 2022, It may be larger than the line widths w21, w22, and w23 of the second-conductor wire 2022b or the second-conductor wire 2022c. For example, the line widths w11 and w12 of the first-first conductive wire 2021a or the first-second conductive wire 2021b of the first winding part 2021 may be 250 micrometers to 380 micrometers. For example, the line widths w21, w22, and w23 of the second-first conductive wire 2022a, the second-second conductive wire 2022b, or the second-three conductive wire 2022c of the second winding part 2022 may be 200 micrometers or more. It can be 250 micrometers. The distance d1 between the first-first conductor 2021a and the first-second conductor 2021b of the first winding unit 2021 may include the second-first conductor 2022a and the second-first conductor 2022a of the second winding unit 2022. The distance d21 between the 2-2 conductive lines 2022b or the distance d22 between the 2-2 conductive lines 2022b and the second-3 conductive lines 2022c may be the same. The distance d1 between the first-first conductor 2021a and the first-second conductor 2021b of the first winding unit 2021 and the second-first conductor 2022a of the second winding unit 2022 and the second wire The spacing d21 between the 2-2 conductive wires 2022b or the spacing d22 between the 2-2 conductive wires 2022b and the second-3 conductive wires 2022c may be 180 micrometers.

The non-divided area 2023 includes a first conductor region 2023a and a second winding portion 2022 connected to the first-first conductor 2021a and the first-second conductor 2021b of the first winding unit 2021. The third conductor region 2023c and the first conductor region 2023a and the third conductor region which are connected to the 2-1 lead wire 2022a, the 2-2 lead wire 2022b, and the 2-3 lead wire 2022c of the It may include a second conductor region 2023b disposed between the 2023c. The first conductor region 2023a, the second conductor region 2023b, and the third conductor region 2023c may be integrally formed.

The width of the first conductor region 2023a may be the same as the line width W1 of the coil of the first winding part 2021. The width of the third conductor region 2023c may be the same as the line width W2 of the coil of the second winding part 2022. The width of the second conductor region 2023b may vary along the length of the coil. That is, the width of the second conductor region 2023b may increase in the direction from the first conductor region 2023a toward the third conductor region 2023c.

The non-split area 2023 may include the first winding part 2021 and the second winding part to connect the first winding part 2021 having the first split structure and the second winding part 2022 having the second split structure. 2022 may be disposed between.

Since the width of the non-divided area 2023 is at least equal to or larger than the line width W1 of the coil of the first winding part 2021, the width of the non-divided area 2023 exceeds 2δ, as shown in Equation (2). Likewise, the resistance component Ys due to the skin effect and the resistance component Yp due to the proximity effect may be increased. In addition, when the length L of the non-divided area 2023 is also large, as shown in Equation 4, the DC resistance R _dc can be large. Therefore, when the width of the non-divided area 2023 exceeds 2δ and the length L of the non-divided area 2023 is increased, the AC resistance Rac is increased to reduce the quality coefficient.

In the sixth embodiment, the DC resistance Rdc may be reduced by reducing the length L of the non-divided area 2023. For example, the length L of the non-divided area 2023 may be 370 micrometers or less.

The non-divided area 2023 may be disposed between the first divided area 2030 and the second divided area 2031. The first terminal 2005a is disposed on one side of the first division region 2030, for example, inside the winding part 2003, and the second terminal 2005b is one side of the second division area 2031, for example, the winding part ( 2003).

The width of the non-divided area 2023, the first terminal 2005a, or the second terminal 2005b is the line width W1 of the coil of the first winding part 2021 or the line width of the coil of the second winding part 2022 ( Since it is larger than W2), it may exceed 2δ. A first virtual straight line 2035 passing through the center 2010 of the winding part 2003 and the second terminal 2005b and a second passing through the center 2010 and the non-dividing area 2023 of the winding part 2003. Two virtual straight lines 2037 may be defined. The first virtual straight line 2035 may pass through the center of the second terminal 2005b. The second virtual straight line 2037 may pass through the center of the non-divided area 2023, specifically, the center of the second conductor area 2023b. The first virtual straight line 2035 and the second virtual straight line 2037 may be virtually defined lines, not entities.

When the first terminal 2005a or the second terminal 2005b is located on the second virtual straight line 2037, the first terminal 2005a and the second terminal located on the first virtual straight line 2035. Since the current does not flow near the mutually opposite surfaces of 2005b, the resistance component Yp due to the proximity effect may increase. In addition, when the first terminal 2005a and / or the second terminal 2005b and the non-divided area 2023 are positioned on the second virtual straight line 2037, they are positioned on the second virtual straight line 2037. Since the current does not flow in close proximity to the mutually opposite surfaces of the first terminal 2005a and / or the second terminal 2005b and the non-divided area 2023, the resistance component Yp due to the proximity effect may increase. .

In the sixth embodiment, in order to solve this problem, the first terminal 2005a is not positioned on the first virtual straight line 2035 or the first terminal 2005a and / or the second terminal 2005b are disposed in the second embodiment. It may not be located on the imaginary straight line 2037. That is, the first terminal 2005a may not overlap the first virtual straight line 2035. The first terminal 2005a and / or the second terminal 2005b may not overlap the second virtual straight line 2037. For example, the first terminal 2005a may not overlap the first virtual straight line 2035. For example, the first terminal 2005a may not overlap the second virtual straight line 2037. For example, the first terminal 2005a may not overlap the first virtual straight line 2035 and the second virtual straight line 2037. For example, the second terminal 2005b may not overlap the second virtual straight line 2037. For example, the first terminal 2005a and the second terminal 2005b may not overlap the second virtual straight line 2037.

For example, the first terminal 2005a may be disposed on the left side of the first virtual straight line 2035, and the non-divided area 2023 may be disposed on the right side of the first virtual straight line 2035. For example, the first terminal 2005a and the second terminal 2005b may be disposed on the left side of the second virtual straight line 2037, and the first terminal 2005a may be disposed on the left side of the straight line.

The first terminal 2005a or the non-divided area 2023 may be located in an area excluding the first virtual straight line 2035, that is, an area not overlapping with each other. The first terminal 2005a or the second terminal 2005b may be located in an area excluding the second virtual straight line 2037, that is, a non-overlapping area. In addition, when a third virtual straight line (not shown) passing through the center 2010 of the winding part 2003 and the first terminal 2005a is defined, the second terminal 2005b or the non-divided area 2023 It may be located in an area excluding a third virtual straight line, that is, a non-overlapping area.

According to an embodiment, the first virtual straight line 2035 or the center 2010 of the winding portion 2003 through which the first terminal 2005a passes through the center 2010 of the winding portion 2003 and the second terminal 2005b. ) And the second terminal straight line 2037 passing through the non-dividing area 2023 or the second terminal 2005b do not overlap with the second virtual straight line 2037, thereby providing the first terminal 2005a. In addition, the resistance factor Yp due to the proximity effect generated between the non-divided area 2023 and the second terminal 2005b may be removed to reduce the AC current, thereby improving the quality coefficient.

In the above description, the first virtual straight line 2035 and the second virtual straight line 2037 have been described as passing through a specific point of the second terminal 2005b or a specific point of the non-divided area 2023. Alternatively, it is possible to invent an overlapping relationship between the first terminal 2005a and the second terminal 2005b or the non-divided area 2023 by using the size of the second terminal 2005b or the non-divided area 2023. This will be described below.

As illustrated in FIG. 24, a first sector region 2025 formed at both ends of the center 2010 of the winding unit 2003 and the first terminal 2005a and the center 2010 and the second of the winding unit 2003 are formed. A second sector region 2026 formed at both ends of the terminal 2005b and a third sector region 2027 formed at both ends of the center 2010 of the winding unit 2003 and the non-divided region 2023 may be defined.

The first fan-shaped region 2025 may refer to a collection area of a virtual line passing through the center 2010 of the winding unit 2003 and the first terminal 2005a.

The second fan-shaped region 2026 may refer to a collection area of a virtual line passing through the center 2010 of the winding portion 2003 and the second terminal 2005b.

The third fan-shaped region 2027 may refer to a region of virtual lines passing through the center 2010 of the winding unit 2003 and the non-divided region 2023.

At both ends of the first terminal 2005a, the first end is connected to the first-first conductor 2021a and the first-second conductor 2021b of the first winding part 2021 of the first division area 2030, and The second stage may be located opposite the first stage. At both ends of the second terminal 2005b, the first end includes the second-first conductive wire 2022a, the second-second conductive wire 2022b, and the second-second of the second winding portion 2022 of the second divided region 2031. The second end may be connected to the third conductive line 2022c and may be positioned opposite to the first end. At both ends of the non-divided region 2023, the first stage is one side of the first conductor region 2023a of the non-divided region 2023 and the first-first conductive line 2021a and the first-first of the first divided region 2030. Connected to the second conductive wire 2021b, the second end of which is the one side of the third conductor region 2023c of the non-divided area 2023, and the second-first conductive wire 2022a and the second second of the second divided area 2031. The second conductive wire 2022b and the second conductive wire 2022c may be connected to each other.

The first sector region 2025 includes an imaginary straight line passing through the center 2010 of the winding unit 2003 and the first end of the first terminal 2005a and the center 2010 and the first terminal of the winding unit 2003. It may be an area formed by another imaginary straight line passing through the second end of 2005a. The second sector region 2026 is a virtual straight line passing through the center 2010 of the winding portion 2003 and the first end of the second terminal 2005b and the center 2010 and the second terminal of the winding portion 2003. It may be an area formed by another imaginary straight line passing through the second end of 2005b. The third sector region 2027 is a virtual straight line passing through the center 2010 of the winding part 2003 and the first end of the non-dividing area 2023, and the center 2010 and the non-dividing area of the winding part 2003. It may be an area formed by another imaginary straight line passing through the second end of 2023.

The first sector region 2025 including the first terminal 2005a may not overlap the second sector region 2026 including the second terminal 2005b. Since the first sector 2025 and the second sector 2026 do not overlap, the first terminal 2005a and the second terminal 2005b also do not overlap, and thus the first terminal 2005a and the second terminal are not overlapped. It is possible to improve the quality factor (Q) by reducing the AC resistance (R _ac ) by eliminating or minimizing the resistance component (Yp) due to the proximity effect generated between (2005b).

The first sector region 2025 including the first terminal 2005a may not overlap the third sector region 2027 including the non-division region 2023. Since the first sector 2025 and the third sector 2027 do not overlap, the first terminal 2005a and the non-divided area 2023 also do not overlap, so that the first terminal 2005a and the non-divided area do not overlap. The quality factor Q may be improved by reducing or reducing the AC resistance R _ac by removing or minimizing the resistance component Yp due to the proximity effect generated between 2023.

The second sector region 2026 including the second terminal 2005b may not overlap the third sector region 2027 including the non-division region 2023. Since the second sector region 2026 and the third sector region 2027 do not overlap, the second terminal 2005b and the non-divided region 2023 also do not overlap, and thus the second terminal 2005b and the non-divided region are not overlapped. The quality factor Q may be improved by reducing or reducing the AC resistance R _ac by removing or minimizing the resistance component Yp due to the proximity effect generated between 2023.

The first sector region 2025 including the first terminal 2005a, the second sector region 2026 including the second terminal 2005b, and the third sector region 2027 including the non-partitioned region 2023. May not overlap. Since the first sector 2025, the second sector 2026, and the third sector 2027 do not overlap, the first terminal 2005a, the second terminal 2005b, and the non-partitioned region 2023 are also used. May not overlap. Accordingly, by removing or minimizing the resistance component (Yp) due to the proximity effect generated between the first terminal (2005a), the second terminal (2005b) and the non-segmented region 2023 to reduce the AC resistance (R _ac ) to reduce the quality The coefficient Q can be improved.

Meanwhile, the electronic device according to the embodiment is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, an MP3 player. , Electric toothbrushes, electronic tags, lighting devices, remote controls, small electronic devices such as bobbers, etc., but are not limited thereto, and may be equipped with a wireless power receiver according to the embodiment of the present invention. Device ", and the term" terminal "or" device "may be used interchangeably. The wireless power receiver according to another embodiment may be mounted in a vehicle, an unmanned aerial vehicle, an air drone, or the like.

Technical details omitted in the description of FIG. 25 below may be modified from the wireless power receiver (800 of FIG. 6), and thus may be easily understood from FIG. 6.

Referring to FIG. 25, the electronic device 1000 according to the embodiment includes a cover 1150, a wireless charging coil module 1105 disposed on one side of the cover, and a battery 1170 disposed on one side of the wireless charging coil module 1105. ) May be included.

Although not shown, another cover corresponding to the cover 1150 may be provided, and they may be fastened to each other. Although not shown, the electronic apparatus 1000 according to the embodiment may further include at least one or more circuits composed of at least one or more electronic components for performing a predetermined operation. At least one circuit may be mounted on a substrate. In this case, at least one circuit is mounted on the opposite side of the substrate facing the battery 1170, so that the at least one circuit is not affected by heat generation of the battery 1170. As the cover 1150 and another cover are fastened, the wireless charging coil module 1105, the battery 1170 and / or at least one or more circuits provided therein may be protected.

For example, the wireless charging coil module 1105 may wirelessly receive power from the wireless power transmitter and charge the battery 1170. In addition, at least one circuit may be driven by the power of the battery 1170 to perform various functions of the electronic device 1000.

The wireless charging coil module 1105 includes a substrate 1110, a first coil 1120, a second coil 1130, a shielding material 1140, and a heat dissipation material 1160. Electronic device 1000 according to the embodiment may be omitted some of the components described above or may be further added to the component having a different function.

For example, the first coil 1120 and the second coil 1130 may be disposed on the substrate 1110, and the shielding material 1140 may be disposed below the substrate 1110. The heat dissipation member 1160 may be disposed under the shielding member 1140. In addition, the battery 1160 may be disposed under the heat dissipation member 1160.

For example, when the heat dissipation of the wireless charging coil module 1105 is easy, the heat dissipation member 1160 may be omitted.

In detail, the substrate 1110 may support the first coil 1120 and the second coil 1130. The substrate 1110 may have a single layer structure or may have a multilayer structure. Here, the substrate 1110 may include a printed circuit board (PCB), a flexible PCB (FPCB), and a film.

The substrate 1110 may include at least one slit 1117 and at least one bridge 1115. Slits may be referred to as openings, gaps, holes or holes.

At least one slit 1117 may be divided into an inner region and an outer region of the substrate 1110. In this case, the first coil 1120 may be disposed in an inner region of the substrate 1110, and the second coil 1130 may be disposed in an outer region of the substrate 1110. At least one slit 1117 may be formed in the substrate 1110 along the circumference of the first coil 1120.

The bridge 1115 is part of the substrate 1110, and the bridge 1115 may be positioned between the slits 1117. Slit 1117 may have various shapes, such as oval or polygon.

The first coil 1120 may be, for example, the wireless charging coil patterns 2004 and 2003 described in the above-described embodiments (FIGS. 7 to 24). The second coil 1130 may be NFC or MST. As another example, the second coil 1130 is NFC and in addition another coil may be disposed on the substrate 1110. The second coil 1130 is disposed outside the first coil 1120. The second coil 1130 may surround the first coil 1120.

The shield 1140 may insulate the first coil 1120 and the second coil 1130. The shielding material 1140 may isolate the first coil 1120 and the second coil 1130 from other components of the wireless power receiver.

The shielding material 1140 may include a first shielding material 1141 and a second shielding material 1145.

The first shielding member 1141 is provided to shield the electromagnetic field of the second coil 1130 and may have an area larger than that of the second coil 1130. The second shielding material 1145 is provided to shield the electromagnetic field of the first coil 1120 and may have an area larger than the area of the first coil 1120. The second shielding material 1145 may be disposed between the substrate 1110 and the first shielding material 1141. The first shielding member 1141 may support the second shielding member 1145, the substrate 1110, the first coil 1120, and the second coil 1130. The second shielding material 1145 may support the first coil 1120 on the substrate 1110.

The second shield 1145 is stacked on the first shield 1114.

The first shielding member 1141 and the second shielding member 1145 may have different physical properties. Here, the first shielding member 1141 and the second shielding member 1145 may have different permeability (μ). Permeability of the first shielding material 1141 may be maintained in the resonant frequency band of the second coil 1130. As a result, the loss ratio of the first shielding member 1141 may be suppressed in the resonant frequency band of the second coil 1130. In addition, the permeability of the second shield 1145 may be maintained in the resonant frequency band of the first coil 1120. As a result, the loss rate of the second shielding material 1145 in the resonant frequency band of the first coil 1120 may be suppressed.

The shielding material 1140 may include a ferrite material. That is, the shielding material 1140 may include metal powders and a resin material. Here, the metal powders may include soft magnetic metal powders, aluminum (Al), metal silicon and iron oxide (FeO; Fe 3 O 4; Fe 2 O 3). In addition, the resin material may include a thermoplastic resin such as a polyolefin elastomer. The metal powders of the first shielding material 1141 and the metal powders of the second shielding material 1145 may be made of different kinds. Meanwhile, the metal powders of the first shielding material 1141 and the metal powders of the second shielding material 1145 may be of the same kind. However, the weight ratio of the metal powders in the first shielding material 1141 and the weight ratio of the metal powders in the second shielding material 1145 may be different. Alternatively, the mixing ratio of the metal powders in the first shielding material 1141 and the mixing ratio of the metal powders in the second shielding material 1145 may be different. In addition, the first shielding member 1141 and the second shielding member 1145 may have the same thickness and may have different thicknesses from each other.

If not shown, the first shielding material 1141 and the second shielding material 1145 may be integrally formed of the same material according to an embodiment.

Although not shown, the first shielding member 1141 may have a hole, and the second shielding member 1145 may be disposed in the hole of the first shielding member 1141 according to the exemplary embodiment.

The heat dissipation member 1160 may be disposed under the shielding member 1140. The heat dissipation member 1160 may be made of a metal material. For example, the heat dissipating member 1160 may be made of copper (Cu), but is not limited thereto.

At least one region of the heat dissipation member 1160 may be fastened to the cover 1150 for the heat dissipation passage, but is not limited thereto.

The above detailed description should not be construed as limiting in all respects but should be considered as illustrative. The scope of the embodiments should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the embodiments are included in the scope of the embodiments.

Embodiments may be used in the field of wireless power transmission and reception.

Claims

A first terminal;

A winding part connected to the first terminal and including a first division region; And

A second terminal connected with the winding part,

The first terminal is a wireless charging coil that does not overlap a virtual straight line passing through the center of the winding portion and the second terminal.
The method of claim 1,

The winding part includes a second divided region, and a non-divided region between the first divided region and the second divided region, the wireless charging coil.
The method of claim 2,

At least one of the first terminal or the second terminal does not overlap a virtual straight line passing through the center of the winding portion and the non-dividing area.
The method of claim 2,

The first divided area is a wireless charging coil divided into two conductive wires.
The method of claim 4, wherein

The second divided area is a wireless charging coil divided into three conductive wires.
The method of claim 5,

The two conductive lines of the first divided region are commonly connected to the first terminal,

The two conductive lines of the first divided region are commonly connected to the non-divided region,

The three conductive lines of the second divided region are commonly connected to the non-divided region,

The three conductive wires of the second divided region are commonly connected to the second terminal.
The method of claim 5,

And a line width of one of the three conductors of the second divided region is different from that of another conductor.
The method of claim 5,

The line width of the lead of the first divided region is greater than the line width of the lead of the second divided region.
The method of claim 5,

The line spacing of the conductive lines of the first divided region is the same as the line spacing of the conductive lines of the second divided region.
The method of claim 2,

The non-divided region includes a first conductor region connected to the first divided region, a third conductor region connected to the second divided region, and a second conductor region disposed between the first conductor region and the third conductor region. Wireless charging coil comprising a.