KR20170139319A - A wireless power transmitter and a wireless power receiver - Google Patents

Abstract

A wireless power transmitter according to an embodiment of the present invention includes: an AC-DC rectifier for rectifying an alternating current received from a power source; a DC-DC converter for converting a rectified direct current; a DC-AC converter for converting the converted direct current into the alternating current; a transmission coil for transmitting the alternating current converted from the DC-AC converter; and a main body including the AC-DC rectifier, the DC-DC converter, and the DC-AC converter, wherein the transmission coil is arranged to surround the lateral side of the main body. Accordingly, the present invention can solve a heating problem of the transmission coil.

Description

[0001] A WIRELESS POWER TRANSMITTER AND A WIRELESS POWER RECEIVER [0002]

The present invention relates to a wireless power transmitter and a wireless power receiver.

2. Description of the Related Art Generally, various electronic apparatuses are equipped with a battery and are driven by using electric power charged in the battery. At this time, in the electronic device, the battery can be replaced and recharged again. To this end, the electronic device has a contact terminal for contact with an external charging device. That is, the electronic device is electrically connected to the charging device through the contact terminal. However, as the contact terminal is exposed to the outside in the electronic device, it may be contaminated by foreign substances or short-circuited by moisture. In this case, there is a problem that a contact failure occurs between the contact terminal and the charging device, and the battery is not charged by the electronic device.

In order to solve the above problems, a wireless power transfer (WPT) for charging an electronic device wirelessly has been proposed. The wireless power transmission system is a technology that transfers power without a line through space and maximizes the convenience of power supply to mobile devices and digital home appliances. The wireless power transmission system has advantages such as saving energy through real-time power usage control, overcoming space limit of power supply, and reducing waste battery discharge by battery recharging.

As a method of implementing a wireless power transmission system, there are typically a magnetic induction type and a self resonance type. The magnetic induction method is a noncontact energy transmission technique in which two coils are brought close to each other, a current is supplied to one coil, and an electromotive force is generated in the other coil via the magnetic flux generated thereby. The self-resonance method is a magnetic resonance technique that uses only electric fields or magnetic fields without using electromagnetic waves or currents, and the distance capable of power transmission is several meters or more, and a band of several MHz can be used.

The wireless power transmission system includes a transmitting device that transmits power wirelessly and a receiving device that receives power to charge a load such as a battery. At this time, a charging method of a receiving apparatus, that is, a charging method of either a magnetic induction method or a self-resonance method can be adopted, and a transmitting apparatus capable of transmitting power wirelessly corresponding to a charging method of a receiving apparatus has been developed.

A wireless power transmitter according to an embodiment of the present invention includes a transmitting coil disposed to surround a side surface of the body of the wireless power transmitter.

In a wireless power transmitter according to an embodiment of the present invention, the side surface of the body of the wireless power transmitter is composed of a transmitting coil.

A wireless power receiver according to an embodiment of the present invention includes a receive coil disposed to surround a side of a body of the wireless power receiver.

In the wireless power receiver according to the embodiment of the present invention, the side of the body of the wireless power receiver is constituted by the receiving coil.

A wireless power transmitter according to an embodiment of the present invention includes an AC-DC rectifier for rectifying an AC current received from a power source; A DC-DC converter for converting the rectified DC current; A DC-AC converter that converts the converted DC current into an AC current; A transmission coil for transmitting the AC current converted from the DC-AC converter; And a main body including the AC-DC rectifier, the DC-DC converter, and the DC-AC converter, wherein the transmission coil is disposed so as to surround the side surface of the main body.

A wireless power receiver according to an embodiment of the present invention includes: a receiving coil for wirelessly receiving AC power from a wireless power transmitter; An AC-DC rectifier for rectifying the received AC current; A DC-DC converter for converting the rectified DC current; A load to be charged with the converted direct current; And a main body including the AC-DC rectifier, the DC-DC converter, and the load, and the receiving coil is disposed so as to surround the side surface of the main body.

The wireless power transmitter according to the embodiment of the present invention can solve the heat generation problem of the transmission coil by including the transmission coil disposed so as to surround the side surface of the body of the wireless power transmitter. In addition, the wireless power transmitter may reduce the internal space for the transmit coil.

In the wireless power transmitter according to the embodiment of the present invention, the side surface of the body of the wireless power transmitter is constituted by a transmission coil, thereby solving the heat generation problem of the transmission coil. In addition, the wireless power transmitter may reduce the internal space for the transmit coil.

The wireless power receiver according to the embodiment of the present invention can solve the heating problem of the receiving coil by including the receiving coil disposed to surround the side surface of the body of the wireless power receiver. In addition, the wireless power receiver may reduce the internal space for the receive coil.

In the wireless power receiver according to the embodiment of the present invention, the side surface of the main body of the wireless power receiver is constituted by the receiving coil, thereby solving the heating problem of the receiving coil. In addition, the wireless power receiver may reduce the internal space for the receive coil.

1 is a magnetic induction equivalent circuit.
2 is a self-resonant-type equivalent circuit.
3A and 3B are block diagrams showing a transmitting apparatus as one of the subsystems constituting a wireless power transmission system.
4A and 4B are block diagrams showing a receiver as one of the subsystems constituting the wireless power transmission system.
5 is a flowchart illustrating an operation of the wireless power transmission system, and is a flowchart illustrating the operation of the wireless power transmission apparatus.
6 illustrates a wireless power transmitter or a wireless power receiver according to an embodiment of the present invention.
7 is a cross-sectional view of a wireless power transmitter or a wireless power receiver in accordance with another embodiment of the present invention.
8 is a cross-sectional view of a wireless power transmitter or wireless power receiver in accordance with another embodiment of the present invention.
9 is a cross-sectional view of a wireless power transmitter and a wireless power receiver in accordance with another embodiment of the present invention.
10 is a cross-sectional view of a wireless power transmitter or wireless power receiver in accordance with another embodiment of the present invention.

Hereinafter, a coil device, a method of manufacturing a coil device, a wireless power transmission device including a coil device, and a wireless power receiving device according to an embodiment of the present invention will be described in detail. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Embodiments of the present invention include a communication system that selectively uses various kinds of frequency bands from low frequency (50 kHz) to high frequency (15 MHz) for wireless power transmission and exchanges data and control signals for system control You may.

Embodiments of the present invention are applicable to a variety of industrial fields such as a mobile terminal industry using a battery or an electronic device required, a smart clock industry, a computer and notebook industry, a household appliance industry, an electric car industry, a medical device industry, Can be applied.

Embodiments of the present invention may consider a system capable of power transmission to one or more multiple devices using one or more transmission coils.

According to the embodiment of the present invention, it is possible to solve the battery shortage problem in a mobile device such as a smart phone and a notebook. For example, when a wireless charging pad is placed on a table and a smartphone or a notebook is used on the table, the battery is automatically charged, . In addition, by installing wireless charging pads in public places such as cafes, airports, taxis, offices, restaurants, etc., mobile devices manufacturers can charge various mobile devices regardless of charging terminals. In addition, when wireless power transmission technology is applied to household electrical appliances such as cleaners, electric fans, etc., there is no need to look for power cables and complex wires can be eliminated in the home, which can reduce wiring in buildings and increase the space utilization. In addition, it takes a lot of time to charge the electric car with the current household power, but if the high power is transmitted through the wireless power transmission technology, the charging time can be reduced. If the wireless charging facility is installed at the bottom of the parking lot, It is possible to solve the inconvenience of having to prepare.

The terms and abbreviations used in the embodiments of the present invention are as follows.

Wireless power transfer system: means a system that provides wireless power transmission within a magnetic field region.

Wireless power transfer unit (PTU): a device that wirelessly transmits power to a wireless power receiving device within a magnetic field area and that manages the entire system, referred to as a wireless power transmitter or transmitter .

Wireless power receiver unit (PRU): An apparatus that receives power wirelessly from a wireless power transmission device within a magnetic field region, and may be referred to as a wireless power receiver or receiver.

Charging area: The area in which the wireless power transmission takes place in the magnetic field area, and may vary depending on the size, required power, and operating frequency of the application product.

S-parameter: The S-parameter is the ratio of the input voltage to the output voltage on the frequency distribution, the transmission of the input port to the output port (S21), or the self reflection value of each input / output port, Reflection (S11, S22) of the reflected output.

Quality factor: The value of Q in resonance means the quality of frequency selection. The higher the Q value, the better the resonance characteristics. The Q value is expressed as the ratio of the energy stored in the resonator to the energy lost.

Typically, there are a magnetic induction type and a magnetic resonance type in a wireless transmission manner.

The magnetic induction method is a non-contact energy transfer technique in which an electromotive force is generated in the load inductor Ll via a magnetic flux generated when the source inductors Ls are brought close to each other and current is supplied to one of the source inductors Ls. The self-resonance method combines two resonators to generate self-resonance by the natural frequency between the two resonators. By resonating at the same frequency and using the resonance technique to form an electric field and a magnetic field in the same wavelength range, Technology.

1 is an equivalent circuit of a magnetic induction type.

Referring to FIG. 1, in a self-induction equivalent circuit, a transmitter includes a source voltage Vs, a source resistance Rs, a source capacitor Cs for impedance matching, and a magnetic coupling And a load coil Rl for impedance matching, a load capacitor Cl for impedance matching, and a load coil Ll for magnetic coupling with a transmitting device. And the degree of magnetic coupling between the source coil Ls and the load coil Ll can be represented by mutual inductance Msl.

In FIG. 1, the ratio S21 of the input voltage to the output voltage is obtained from a magnetic induction equivalent circuit consisting only of a coil, which does not have the source capacitor Cs and the load capacitor Cℓ for impedance matching, The power transmission condition satisfies Equation (1) below.

The maximum power transmission is possible when the ratio of the inductance of the transmission coil Ls to the source resistance Rs and the ratio of the inductance of the load coil Ll to the load resistance Rl are equal to each other. Since there is no capacitor that can compensate for reactance in a system with only an inductance, the value of the self reflection value S11 of the input / output port can not be zero at the point where the maximum power transfer occurs, and the mutual inductance Msl), the power transmission efficiency may vary greatly. Thus, a source capacitor Cs may be added to the transmission device as a compensation capacitor for impedance matching, and a load capacitor C l may be added to the reception part. The compensation capacitors Cs and C l may be connected in series or in parallel to the receiving coil Ls and the load coil L l, respectively. Further, for the impedance matching, a passive element such as an additional capacitor and an inductor may be added to each of the transmitter and the receiver as well as the compensation capacitor.

2 is an equivalent circuit of a self-resonant system.

2, in a self-resonant-type equivalent circuit, a transmitting device includes a source coil constituting a closed circuit by a series connection of a source voltage Vs, a source resistor Rs and a source inductor Ls, Side resonant coil constituting a closed circuit by a series connection of the inductor L1 and the transmission-side resonance capacitor C1 and the receiving portion is formed by a series connection of the load resistor Rl and the load inductor Ll, Side resonance coil constituting a closed circuit by a series connection of a load coil constituting the input side resonance inductor L2 and a resonance inductor L2 on the reception side and a resonance capacitor C2 on the reception side, (L1) is magnetically coupled to the coupling coefficient of K01, the load inductor (L) and the load side resonance inductor (L2) are magnetically coupled to each other by a coupling coefficient of K23, and the transmission side resonance inductor Inductor (L2) is the coupling coefficient of K12, It is coupled to. In the equivalent circuit of another embodiment, the source coil and / or the load coil may be omitted and only the transmission-side resonance coil and the reception-side resonance coil may be formed.

When the resonance frequencies of the two resonators are the same, most of the energy of the resonator of the transmitting device is transmitted to the resonator of the receiving part to improve the power transmission efficiency. The efficiency in the self resonance method satisfies Equation 2 below When it does, it gets better.

(Where k is the coupling coefficient and? Is the attenuation factor)

In order to increase the efficiency in the self-resonant mode, an element for impedance matching can be added, and the impedance matching element can be a passive element such as an inductor and a capacitor.

Based on such a wireless power transmission principle, a wireless power transmission system for transmitting power by a magnetic induction method or a self resonance method will be described.

FIGS. 3A and 3B are block diagrams illustrating a wireless power transmission apparatus as one of the sub-systems constituting the wireless power transmission system.

In accordance with an embodiment of the present invention, the wireless power transmission apparatus 1000 may be referred to as a wireless power transmitter, a transmitter, and a transmission apparatus.

Referring to FIG. 3A, a wireless power transmission system according to an embodiment of the present invention may include a transmitting apparatus 1000 and a receiving apparatus 2000 receiving power wirelessly from a transmitting apparatus 1000. The wireless power transmission apparatus 1000 generates a magnetic field based on the AC signal output from the transmission-side power conversion unit 101 and the transmission-side power conversion unit 101 that converts the input AC signal into an AC signal and outputs it as an AC signal, Controls the power conversion of the transmission side resonance circuit unit 102 and the transmission side power conversion unit 101 that supply electric power to the device 2000 and adjusts the amplitude and frequency of the output signal of the transmission side power conversion unit 101 and controls the impedance of the transmission side resonance circuit unit 102 And a transmission side control unit 103 that performs impedance matching, senses impedance, voltage, and current information from the transmission side power conversion unit 101 and the transmission side resonance circuit unit 102, and wirelessly communicates with the reception device 2000. The transmission-side power conversion unit 101 may include at least one of a power conversion unit for converting an AC signal to a DC, a power conversion unit for varying a level of a DC to output a DC, and a power conversion unit for converting a DC to an AC. The transmission side resonance circuit unit 102 may include a coil and an impedance matching unit capable of resonating with the coil. The transmission-side control unit 103 may include a sensing unit and a wireless communication unit for sensing impedance, voltage, and current information.

3B, the transmission apparatus 1000 includes a transmission side AC / DC conversion unit 1100, a transmission side DC / AC conversion unit 1200, a transmission side impedance matching unit 1300, a transmission coil unit 1400, a transmission side communication and control unit 1500, a geomagnetic sensor 1600 may be included. According to another embodiment of the present invention, the transmitting apparatus 1000 may not include the transmitting-side impedance matching unit 1300.

The transmitting side AC / DC converting unit 1100 is a subsystem for converting the AC signal provided from the outside into a DC signal under the control of the transmitting side communication and control unit 1500. The transmitting side AC / DC converting unit 1100 includes a rectifier 1110, And a transmission side DC / DC converter 1120. [ The rectifier 1110 converts a supplied AC signal into a DC signal. The rectifier 1110 may be a diode rectifier having a relatively high efficiency in high-frequency operation, a synchronous rectifier capable of one-chip operation, And can be a hybrid rectifier having a high degree of freedom of dead time. However, the present invention is not limited to this, and can be applied to a system that converts AC to DC. The transmitting side DC / DC converting unit 1120 controls the level of the DC signal supplied from the rectifier 1110 under the control of the transmitting side communication and control unit 1500. As an example of implementing this, a buck converter for lowering the level of the input signal, A boost converter that boosts the level of the signal, a buck boost converter or a cuk converter that can raise or lower the level of the input signal. The transmitting side DC / DC converting unit 1120 includes a switching element having a power conversion control function, an inductor and a capacitor for performing a power conversion mediation role or an output voltage smoothing function, a transformer for controlling a voltage gain or electrically separating And can remove the ripple component or the ripple component (AC component included in the DC signal) included in the input DC signal. The error between the command value of the output signal of the transmitting side DC / DC converter 1120 and the actual output value can be adjusted through the feedback method, and this can be done by the transmitting side communication and control unit 1500.

The transmission side DC / AC conversion unit 1200 converts a DC signal output from the transmission side AC / DC conversion unit 1100 into an AC signal under the control of the transmission side communication and control unit 1500, and adjusts the frequency of the converted AC signal An example of this is a half bridge inverter or a full bridge inverter. In the wireless power transmission system, various amplifiers for converting direct current to alternating current can be applied. For example, class A, class B, class AB, class C, class E class F amplifier. The transmitting side DC / AC converting unit 1200 may include an oscillator for generating a frequency of an output signal and a power amplifier for amplifying an output signal.

The configuration of the AC / DC converter 1100 and the transmission side DC / AC converter 1200 may be replaced with an AC power supply, and may be omitted or replaced with another configuration.

The transmission-side impedance matching unit 1300 minimizes the reflected waves at points having different impedances to improve the signal flow. Since the two coils of the transmitting apparatus 1000 and the receiving apparatus 2000 are spatially separated and leakage of the magnetic field is large, the impedance difference between the two connecting ends of the transmitting apparatus 1000 and the receiving apparatus 2000 is corrected to improve the power transmission efficiency. The impedance matching unit 1300 may include at least one of an inductor, a capacitor, and a resistor. Under the control of the communication and control unit 1500, the inductance of the inductor, the capacitance of the capacitor, Can be adjusted. When the wireless power transmission system transmits power in a self-induction manner, the transmission-side impedance matching unit 1300 may have a series resonance structure or a parallel resonance structure, and increase the inductance coupling coefficient between the transmission apparatus 1000 and the reception apparatus 2000 Energy loss can be minimized. When the wireless power transmission system transmits power in a self-resonant manner, the transmission-side impedance matching unit 1300 may change the separation distance between the transmission device 1000 and the reception device 2000, or may change a foreign object (FO) It is possible to perform real-time correction of the impedance matching according to the change of the matching impedance on the energy transmission line due to the change of the characteristic of the coil due to mutual influences and the like. As the correction method, there can be used a multi-matching method using capacitors, A loop-based method, or the like.

The transmission coil 1400 may be implemented as a plurality of coils or a plurality of coils. If a plurality of transmission coils 1400 are provided, the transmission coils 1400 may be spaced apart from each other or may be overlapped with each other. The area can be determined in consideration of the deviation of the magnetic flux density. Further, when the transmission coil 1400 is manufactured, it can be manufactured in consideration of the internal resistance and radiation resistance. If the resistance component is small, the quality factor can be increased and the transmission efficiency can be increased.

The communication and control unit 1500 may include a transmission-side control unit 103 and a transmission-side communication unit 105. Side controlling unit 103 controls the transmitting side AC / DC converter in consideration of at least one of the power demand of the wireless power receiving apparatus 2000, the present charging amount, the voltage Vrect of the rectifier output terminal of the receiving apparatus 2000, DC converter 1100 or the current (Itx_coil) flowing in the transmission coil of the transmission side DC / AC converter 1200. Considering the maximum power transmission efficiency, the frequency and switching waveforms for driving the transmission side DC / AC converter 1200 It is possible to control the overall operation of the receiving apparatus 2000 by using an algorithm, a program, or an application required for the control read from the storage unit (not shown) of the receiving apparatus 2000. Meanwhile, The transmitting-side control unit 103 may be a microprocessor, a microcontroller unit (MCU), or a micom The transmission side communication unit 105 can communicate with the reception side communication unit 205 and can use a short distance communication system such as Bluetooth, NFC, Zigbee, for example. The remaining capacity of the wireless power receiving apparatus 2000, the remaining capacity of the battery, the number of times of charging, the amount of usage, the battery capacity, the battery ratio, and the charging status information of the transmission apparatus 1000 The transmission side communication unit 105 may transmit a charging function control signal for controlling the charging function of the receiving apparatus 2000, and the charging function control signal may control the wireless power receiving apparatus 2000 to charge the charging function Which may be enabled or disabled.

As described above, the transmission-side communication unit 105 may be communicated in an out-of-band format including a separate module, but the present invention is not limited thereto, Band in which the transmitting apparatus 1000 transmits a signal to the receiving apparatus 2000 by using a feedback signal transmitted to the transmitting apparatus 1000 by using a frequency shift of the power signal transmitted from the transmitting apparatus 1000, -band) format. For example, the receiving apparatus 2000 may transmit a feedback signal to the wireless power transmission apparatus 1000 via a feedback signal by modulating a feedback signal to inform information such as charging start, charging end, and battery state. The transmitting-side communication unit 105 may be configured separately from the transmitting-side control unit 103, and the receiving-side communication unit 205 may be included in the control unit 203 of the receiving apparatus 2000 or separately.

The wireless power transmission apparatus 1000 of the wireless power transmission system according to the embodiment of the present invention may further include a detection unit 1600. The detection unit 1600 includes an input signal of the transmission side AC / DC conversion unit 1100, an output signal of the transmission side AC / DC conversion unit 1100, an input signal of the transmission side DC / AC conversion unit 1200, an output signal of the transmission side DC / , The input signal of the transmission side impedance matching unit 1300, the output signal of the transmission side impedance matching unit 1300, the input signal of the transmission side coil 1400, or the signal on the transmission side coil 1400. For example, the signal may include at least one of information on a current, information on a voltage, or information on an impedance. The detected signal is fed back to the communication and control unit 1500, and the communication and control unit 1500 can control the transmitting side AC / DC converting unit 1100, the transmitting side DC / AC converting unit 1200, and the transmitting side impedance matching unit 1300. Also, the communication and control unit 1500 can perform FOD (foreign object detection) based on the detection result of the detection unit 107. [ And the detected signal may be at least one of a voltage and a current. Meanwhile, the detection unit 1600 may be configured by hardware different from the communication and control unit 1500, or may be implemented by one hardware.

4A and 4B are block diagrams illustrating a wireless power receiving apparatus as one of subsystems constituting a wireless power transmission system.

According to an embodiment of the present invention, the wireless power receiving apparatus 2000 may be referred to as a wireless power receiver or receiver or receiver.

Referring to FIG. 4A, a wireless power transmission system according to an embodiment of the present invention may include a transmitting apparatus 1000 and a receiving apparatus 2000 receiving power wirelessly from a transmitting apparatus 1000. The receiving apparatus 2000 includes a receiving-side resonant circuit section 201 for receiving the AC signal transmitted from the transmitting apparatus 1000, a receiving-side power converting section 202 for converting the AC power from the receiving-side resonant circuit section 201 into a DC signal, Side resonance circuit portion 201, impedance matching of the resonance circuit portion 201 of the reception side, or power conversion of the reception-side power conversion portion 202 is performed Controls the level of the output signal of the reception-side power conversion unit 202, or senses the input or output voltage or current of the reception-side power conversion unit 202 or determines whether or not the output signal of the reception-side power conversion unit 202 is supplied to the load 2500 And a receiving-side control unit 203 that can communicate with the transmitting apparatus 1000 or the like. The reception-side power conversion unit 202 may include a power conversion unit that converts an AC signal to DC, a power conversion unit that varies a level of DC to output a DC, and a power conversion unit that converts DC into AC.

4B, the wireless power transmission system according to the embodiment of the present invention may include a transmitting apparatus 1000 and a receiving apparatus 2000 receiving power wirelessly from the transmitting apparatus 1000. [ Receiving apparatus 2000 includes a receiving-side resonant circuit unit 201, a receiving-side AC / DC converting unit 2300, a DC / DC converting unit 2400, a load 2500, and a receiving-side communication and control unit 2600, And may include a geomagnetic sensor 2600. The receiving-side AC / DC converter 2300 can be referred to as a rectifier for rectifying the AC signal into a DC signal. The receiving apparatus 2000 may not include the receiving-side impedance matching unit 2200 according to another embodiment of the present invention.

The receiving side coil part 2100 can receive power through a magnetic induction method or a self resonance method. As described above, at least one of the induction coil and the resonance coil may be included according to the power reception scheme.

In one embodiment, the receiving side coil part 2100 may be disposed in a portable terminal together with an antenna for Near Field Communication (NFC). The receiving side coil part 2100 may be the same as the transmitting side coil part 1400, and the dimensions of the receiving antenna may vary depending on the electrical characteristics of the receiving device 2000.

The reception-side impedance matching unit 2200 performs impedance matching between the transmission apparatus 1000 and the reception apparatus 2000.

The receiving-side AC / DC converter 2300 rectifies the AC signal output from the receiving-side coil 2100 to generate a DC signal. The output-side voltage of the receiving-side AC / DC converter 2300 may be referred to as a rectified voltage Vrect. The receiving-side communication and control unit 2600 may detect or change the output voltage of the receiving-side AC / DC converter 2300, (Referred to as a minimum rectified voltage Vrect_min (or a minimum output voltage Vrect_min) which is the minimum value of the output voltage of the AC-DC converter 2300, a maximum rectified voltage Vrect_max ), And information on an optimum rectified voltage Vrect_set (referred to as an optimum output voltage Vrect_set) having any one of a voltage value between a minimum value and a maximum value, to the transmitting apparatus 1000 .

The receiving-side DC / DC converting section 2400 can adjust the level of the DC signal output from the receiving-side AC / DC converting section 2300 to the capacity of the load 2500.

The load 2500 can include a battery, a display, a voice output circuit, a main processor, a battery management unit, and various sensors. The load 2500 may include at least a battery 2510 and a battery management unit 2520 as shown in FIG. 4A. The battery management unit 2520 can sense the charged state of the battery 2510 and adjust the voltage and current applied to the battery 2510.

The receiving communication and control unit 2600 can be activated by the wake-up power from the transmitting communication and control unit 1500 and can communicate with the transmitting communication and control unit 1500 and control the operation of the receiving device 2000 subsystem .

The receiving apparatus 2000 may be constituted by a single or a plurality of receiving apparatuses and may be capable of wirelessly receiving energy from the transmitting apparatus 1000 at the same time. That is, in the wireless power transmission system of the self resonance type, a plurality of receiving apparatuses can receive power from one transmitting apparatus 1000. At this time, the transmission-side impedance matching unit 1300 of the transmission apparatus 1000 may adaptively perform impedance matching between a plurality of reception apparatuses. This can be equally applied to a case where a plurality of reception side coil portions independent from each other in the magnetic induction system are provided.

Also, when the receiving apparatus 2000 is composed of a plurality of receiving apparatuses, the power receiving systems may be the same system or different types of systems. In this case, the transmitting apparatus 1000 may be a system for transmitting power by a magnetic induction system or a self-resonance system, or a system for mixing both systems.

Meanwhile, in the case of the radio power transmission of the magnetic induction type, in the transmitting apparatus 1000, the transmitting side AC / DC converting unit 1100 converts the size and the frequency of the signal of the wireless power transmission system into several tens or hundreds of V (for example, 110V to 220V (For example, 60 Hz), and can convert and output a DC signal of several V to several tens V and several hundred V (for example, 10 V to 20 V) The AC converting unit 1200 may receive an AC signal and output an AC signal of KHz band (e.g., 125 KHz). The receiving AC / DC converter 2300 of the receiving apparatus 2000 receives the AC signal of KHz band (for example, 125KHz) and converts it into a DC signal of several V to several tens V, several hundred V (for example, 10V to 20V) And the receiving side DC / DC converting section 2400 can output a DC signal of, for example, 5V suitable for the load 2500 and transmit it to the load 2500. In the case of the wireless power transmission of the self-resonance type, the transmitting side AC / DC converting unit 1100 in the transmitting apparatus 1000 may transmit data of several tens or several hundreds Hz (for example, 60 Hz) AC converting unit 1200 can receive a DC signal and convert it into a DC signal of several V to several tens V and several hundred V (for example, 10 V to 20 V) 6.78MHz) can be output. The receiving AC / DC converter 2300 of the receiving apparatus 2000 receives the AC signal of MHz (for example, 6.78 MHz) and receives the receiving DC signal of several V to several tens V, several hundred V (for example, 10 V to 20 V) And the DC / DC converter 2400 can output a DC signal of, for example, 5V suitable for the load 2500 and transmit it to the load 2500.

5 is a flowchart illustrating an operation of the wireless power transmission system, and is a flowchart illustrating the operation of the wireless power transmission apparatus.

5, a transmitter 1000 according to an embodiment of the present invention may have at least 1) a standby state, 2) a digital ping state, 3) an authentication state, 4) a power delivery state, and 5) a charge end state.

[Standby]

(1) When power is externally applied to the transmitting unit 1000 to start the transmitting unit 1000, the transmitting unit 1000 may be in a standby state. The transmitting unit 1000 in the standby state can detect the presence of an object (for example, the receiving unit 2000 or metallic foreign matter (FO)) disposed in the charging area.

(2) As a method of detecting the existence of an object in the charging area, the transmission unit 1000 can detect the object by monitoring the change of the magnetic flux, the change in capacitance or inductance between the object and the transmission unit 1000, or the shift in resonance frequency. But is not limited thereto.

(3) If the transmitter 1000 detects an object of the receiver 2000 in the charging area, it can proceed to the next digital ping state.

[Digital ping]

(1) In the digital ping state, the transmission unit 1000 is connected to the chargeable reception unit 2000, and confirms that it is an effective reception unit 2000 that can be charged with radio power provided from the transmission unit 1000. The transmission unit 1000 can generate and output a digital ping having a predetermined frequency and timing to be connected to the chargeable reception unit 2000.

(2) If sufficient power signals for the digital ping are delivered to the receiver 2000, the receiver 2000 may respond to the digital ping by modulating the power signal according to a communication protocol. If the transmitting unit 1000 receives a valid signal from the receiving unit 2000, the receiving unit 2000 can proceed to the authentication state without removing the power signal. If an end-of-charge (EOC) request is received from the receiver 2000, the transmitter 1000 may proceed to a charge-terminated state.

(3) When the effective receiving unit 2000 is not detected or the response time of the object for the digital ping exceeds a preset time, the transmitting unit 1000 can return to the standby state by removing the power signal.

[Identification]

(1) When the response of the receiving unit 2000 according to the digital ping of the transmitting unit 1000 is completed, the transmitting unit 1000 can transmit the authentication information of the transmitting unit 1000 to the receiving unit 2000 so that compatibility between the transmitting unit 1000 and the receiving unit 2000 can be confirmed. If compatibility is confirmed, the receiving unit 2000 can transmit the authentication information to the transmitting unit 1000. The transmitting unit 1000 can confirm the authentication information of the receiving unit 2000.

(2) When the mutual authentication is completed, the transmitter 1000 proceeds to the power transmission state. If the authentication fails, or the authentication time exceeds the predetermined authentication time, the transmitter 1000 can return to the standby state.

[Power Transfer State]

(1) The communication and control unit 1500 of the transmission unit 1000 can provide charging power to the reception unit 2000 by controlling the transmission unit 1000 based on the control data provided from the reception unit 2000. [

(2) Further, the transmitter 1000 can verify that the proper operating range is not exceeded or that the stability according to the FOD is not problematic.

(3) When the transmitter 1000 receives the charge completion signal from the receiver 2000 or exceeds the preset limit temperature, the transmitter 1000 can stop the power transmission and proceed to the charge completion state.

(4) In the case of a situation where the power is not suitable for transmission, the power signal can be removed and returned to the standby state. If the receiving unit 2000 enters the charging area again after the receiving unit 2000 is removed, the above-described cycle can be performed again.

(5) It is also possible to return to the authentication state in the charging state of the load 2500 of the receiving unit 2000, and to supply the adjusted charging power to the receiving unit 2000 based on the state information of the load 2500. [

[End of Charge (EOC))

(1) The transmitting unit 1000 may receive information indicating that the charging is completed from the receiving unit 2000, or may go to the charging ending state when receiving information that the receiving unit 2000 has risen above a predetermined temperature.

(2) When the transmitting unit 1000 receives the charging completion information from the receiving unit 2000, the transmitting unit 1000 can stop the power transmission and wait for a predetermined time. After a predetermined time has elapsed, the transmitting unit 1000 may enter the digital ping state to be connected to the receiving unit 2000 disposed in the charging area.

(3) If the transmitter 1000 receives information indicating that the preset temperature has been exceeded from the receiver 2000, it can wait for a certain period of time. After a lapse of a predetermined time, the transmitting unit 1000 may enter the digital ping state to be connected to the receiving unit 2000 disposed in the charging area.

(4) The transmitter 1000 can monitor whether the receiver 2000 is removed from the charging area for a predetermined time, and can return to the standby state when the receiver 2000 is removed from the charging area.

6 illustrates a wireless power transmitter or a wireless power receiver according to an embodiment of the present invention.

A wireless power transmitter 1000 or a wireless power receiver 2000 according to an embodiment of the present invention may include a metal body. When the body is formed of metal, durability is strong and aesthetically satisfactory to the user, and the wireless power transmitter 1000 or the wireless power receiver 2000 is required to be adopted. However, the metal material causes interference of the wireless charging signal, and its adoption in the wireless power transmitter 1000 or the wireless power receiver 2000 is limited.

6 (a), the wireless power transmitter 1000 may include a transmit coil 1400 that surrounds the side of the body of the wireless power transmitter 1000. Or the wireless power receiver 2000 may include a receive coil 2100 surrounding the side of the body of the wireless power receiver 2000. [

6 (b) is a cross-sectional view of a wireless power transmitter 1000 or a wireless power receiver 2000. As shown in FIG. FIG. 6C is a side view of the wireless power transmitter 1000 or the wireless power receiver 2000. FIG.

The main body of the wireless power transmitter 1000 according to the embodiment of the present invention includes an AC-DC rectifier 1110 for rectifying an AC current received from a power source, a DC-DC converter 1120 for converting a rectified DC current, Current converter 1200 that varies with current. Transmit coil 1400 may transmit the converted AC current from the DC-to-AC converter to wireless power receiver 2000. The AC-DC rectifier 1110, the DC-DC converter 1120, and the DC-AC converter 1200 may be arranged so as to surround the inside of the side surface of the main body. The transmission coil 1400 may be arranged to surround the outside of the side surface of the main body.

The main body of the wireless power receiver according to the embodiment of the present invention includes an AC-DC rectifier for rectifying an AC current received from the wireless power transmitter 1000, a DC-DC converter for converting the rectified DC current, Lt; / RTI > load. The AC-DC rectifier, the DC-DC converter, and the load may be disposed so as to surround the inside of the side surface of the main body. And the receiving coil 2100 may be disposed so as to surround the outside of the side surface of the main body.

In accordance with an embodiment of the present invention, the transmit coil 1400 may be disposed to surround the body of the wireless power transmitter 1000 such that the transmit coil 1400 is spaced a predetermined distance between the transmit coils 1400. Furthermore, the receiving coil 2100 may be arranged to surround the body of the wireless power receiver 2000 so as to be spaced apart from the receiving coils 2100 by a predetermined interval.

In a wireless power transmitter or a wireless power receiver according to an embodiment, the transmission coil 1400 and the reception coil 2100 may be coated with an insulating material or a shielding material so as not to be short-circuited with the metal body.

The wireless power transmitter or the wireless power receiver according to the embodiment has the effect of realizing the wireless charging function even when the metal body is used.

The wireless power transmitter or the wireless power receiver according to the embodiments can arrange various circuits on the inner side of the main body, thereby maximizing direct application and space utilization. Further, it is possible to maximize the heat radiating effect by being directly disposed on the body of the metal material exposed to the outside.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment realizes a wireless power function even when a main body of a metal material is formed, and at the same time, the charging area is wider than when the transmitting coil or the receiving coil is formed inside the main body Can be. Particularly, in the case of a mobile device having a wireless charging and receiving function, the above-mentioned effect can be maximized in accordance with the tendency of a recent screen becoming larger.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment realizes a wireless power function even when the body of a metal material is formed, and at the same time, the length of the coil So that the charging efficiency can be improved. Particularly, in the case of a mobile device having a wireless charging and receiving function, the above-mentioned effect can be maximized in accordance with the tendency of a recent screen becoming larger.

7 is a cross-sectional view of a wireless power transmitter or a wireless power receiver in accordance with another embodiment of the present invention.

7A, the wireless power transmitter 1000 may include a transmit coil 1400 that surrounds the side of the body of the wireless power transmitter 1000. The transmission coil 1400 can be arranged so as to surround the side surface of the body of the wireless power transmitter 1000 without a gap between the coils.

The wireless power receiver 2000 may also include a receive coil 2100 surrounding the side of the body of the wireless power receiver 2000. The receiving coil 2100 can be arranged so as to surround the side surface of the body of the wireless power receiver 2000 without spaces between the coils.

Referring to FIG. 7 (b), the transmission coil 1400 may be disposed so as to surround the side of the main body of the wireless power transmitter 1000 so as to be spaced apart from each other by predetermined intervals. The wireless power transmitter 1000 according to the embodiment can adjust the coil interval to optimize the wireless power transmission conditions. At this time, an insulator or a shielding material may be disposed at a spaced distance of the transmission coil 1400. The wireless power transmitter 1000 according to the embodiment may have a shielding material or an insulator disposed between the side transmission coils 1400 so as to minimize the electromagnetic interference effect and improve the durability.

In addition, the receiving coil 2100 may be arranged to surround the side surface of the body of the wireless power receiver 2100 so as to be spaced apart from each other by a predetermined interval. The wireless power transmitter 1000 according to the embodiment can adjust the coil interval to optimize the wireless power transmission conditions. At this time, an insulator or a shielding material may be disposed at a spaced distance between the receiving coils 2100. The wireless power receiver 2000 according to the embodiment may have a shielding material or an insulator disposed between the side receiving coils 2100 so as to minimize the electromagnetic interference effect and improve the durability.

Referring to FIG. 7C, the transmission coil 1400 may be arranged to surround the side surface of the body of the wireless power transmitter 1000 so as to be spaced apart from each other by a predetermined distance. At this time, the sides of the main body of the wireless power transmitter 1000 may include spaced apart portions 701 of the spaced-apart spaces. According to another embodiment of the present invention, the side of the body of the wireless power transmitter 1000 may be comprised of a transmit coil 1400. At this time, the wireless power transmitter 1000 can circulate air to the inside of the main body of the wireless power transmitter 1000 through the spacing portion 701. The wireless power transmitter 1000 can dissipate heat inside the body through the air.

Further, the receiving coil 2100 may be arranged to surround the side surface of the body of the wireless power receiver 2000 so as to be spaced apart from each other by a predetermined interval. At this time, the sides of the main body of the wireless power receiver 2000 may include the empty spaces 701 at the spaced intervals. According to another embodiment of the present invention, the side of the body of the wireless power receiver 2000 may comprise a receive coil 2100. At this time, the wireless power receiver 2000 can circulate air into the body of the wireless power receiver 2000 through the empty space 701. The wireless power receiver 2000 may radiate heat inside the body through the air.

Referring to FIG. 7 (d), the side of the body of the wireless power transmitter 1000 may be composed of a transmitting coil 1400. That is, the main body of the wireless power transmitter 1000 can form the side surface of the main body with the transmission coil 1400 without a separate side cover.

In addition, the side of the body of the wireless power receiver 2000 may comprise a receive coil 2100. That is, the body of the wireless power receiver 2000 can form the side of the body with the receiving coil 2100 without a separate side cover.

8 is a cross-sectional view of a wireless power transmitter or wireless power receiver in accordance with another embodiment of the present invention.

Referring to Figure 8 (a), the transmit coil 1400 of the wireless power transmitter 1000 may include an inductive coil and a resonant coil. At this time, the induction coil may be arranged to surround the outside or inside of the body side of the wireless power transmitter 1000. The resonant coil may be disposed to surround the inside or the outside of the side surface of the body of the wireless power transmitter 1000. According to another embodiment of the present invention, the side surface of the body of the wireless power transmitter 1000 may be constituted by the induction coil and the resonance coil without a separate cover. According to another embodiment of the present invention, the side surface of the main body of the wireless power transmitter 1000 may be made of a material other than metal.

The receiving coil 2100 of the wireless power receiver 2000 may also include an inductive coil and a resonant coil. At this time, the induction coil may be arranged to surround the outside or the inside of the body side of the wireless power receiver 2000. The resonant coil may be arranged to surround the inside or the outside of the side of the body of the wireless power receiver 2000. According to another embodiment of the present invention, the side surface of the body of the wireless power receiver 2000 may be composed of the induction coil and the resonance coil without a separate cover. According to another embodiment of the present invention, the side surface of the main body of the wireless power transmitter 1000 may be made of a material other than metal.

8 (b), the induction coil may be disposed so as to surround the inside or the outside of the side surface of the body of the wireless power transmitter 1000 by a predetermined distance between the coils. In addition, the resonance coil may be disposed so as to surround the inside or the outside of the side surface of the body of the wireless power transmitter 1000 by a predetermined distance between the coils. According to another embodiment of the present invention, the side surface of the main body of the wireless power transmitter 1000 may be made of a material other than metal.

The induction coil may be disposed so as to surround the inside or outside of the side surface of the body of the wireless power receiver 2000 so as to be spaced apart from each other by a predetermined distance between the coils. In addition, the resonance coil may be arranged to surround the inside or the outside of the side surface of the body of the wireless power receiver 2000 by a predetermined distance between the coils. According to another embodiment of the present invention, a shielding material or an insulator may be disposed at the spaced apart intervals. According to another embodiment of the present invention, the side surface of the main body of the wireless power transmitter 1000 may be made of a material other than metal.

8C, the induction coil may be disposed so as to surround the inside or the outside of the side surface of the main body of the wireless power transmitter 1000 by a predetermined distance between the coils. In addition, the resonance coil may be disposed so as to surround the inside or the outside of the side surface of the body of the wireless power transmitter 1000 by a predetermined distance between the coils. At this time, the wireless power transmitter 1000 may include a spacing portion 801 which is an empty space of the interval between the induction coil and the resonance coil. The wireless power transmitter 1000 can introduce air through the spacing portion 801. [ The wireless power transmitter 1000 may emit heat inside the wireless power transmitter 1000 through the air. According to another embodiment of the present invention, the side surface of the main body of the wireless power transmitter 1000 may be made of a material other than metal.

The induction coil may be disposed so as to surround the inside or the outside of the side surface of the body of the wireless power receiver 2000 by a predetermined distance between the coils. In addition, the resonance coil may be arranged to surround the inside or the outside of the side surface of the body of the wireless power receiver 2000 by a predetermined distance between the coils. At this time, the wireless power receiver 2000 may include a spaced apart portion 801 of the spaced distance between the induction coil and the resonance coil. The wireless power receiver 2000 may introduce air through the spacing 801. [ The wireless power receiver 2000 may emit heat inside the wireless power receiver 2000 through the air. According to another embodiment of the present invention, the side surface of the main body of the wireless power receiver 2000 may be made of a material other than metal.

9 is a cross-sectional view of a wireless power transmitter and a wireless power receiver in accordance with another embodiment of the present invention.

9 (a), the transmit coil 1400 of the wireless power transmitter 1000 may include an inductive coil and a resonant coil. The induction coil and the resonance coil may be arranged to surround the side surface of the body of the wireless power transmitter 1000 so as not to overlap with each other. For example, the induction coil may be disposed so as to surround the side surface of the body of the wireless power transmitter 1000 at a predetermined distance between the induction coils. At this time, the resonance coil may be disposed so as to surround a part spaced apart from the induction coil.

The receiving coil 2100 of the wireless power receiver 2000 may also include an inductive coil and a resonant coil. The induction coil and the resonance coil may be arranged to surround the side surface of the body of the wireless power receiver 2000 so as not to overlap with each other. For example, the induction coil may be arranged to surround the side surface of the body of the wireless power receiver 2000 at a predetermined distance between the induction coils. At this time, the resonance coil may be disposed so as to surround a part spaced apart from the induction coil.

Referring to FIG. 9 (b), the induction coil may be arranged to surround a part of the side surface of the body of the wireless power transmitter 1000. At this time, the resonance coil may be arranged to surround another part of the side surface of the main body.

In addition, the induction coil may be arranged to surround a part of the side surface of the main body of the wireless power receiver 2000. At this time, the resonance coil may be arranged to surround another part of the side surface of the main body.

10 is a cross-sectional view of a wireless power transmitter or wireless power receiver in accordance with another embodiment of the present invention.

10, the wireless power transmitter 1000 may include a transmit coil 1400 surrounding a side of the wireless power transmitter 1000 outside the body. The wireless power transmitter 1000 may include a shielding layer surrounding the sides of the body. The wireless power transmitter 1000 may include circuitry within the shielding layer. The circuit unit may include an AC-DC rectifier 1110, a DC-DC converter 1120, and a DC-AC converter 1200.

The wireless power receiver 2000 may also include a receive coil 2100 that surrounds the outside of the body of the wireless power receiver 2000. The wireless power receiver 2000 may include a shielding layer surrounding the sides of the body. The wireless power receiver 2000 may include circuitry within the shielding layer. The circuit unit may include an AC-DC converter 2300, a DC-DC converter 2400, and a load 2500.

A wireless power transmitter or a wireless power receiver according to an exemplary embodiment may implement a wireless power function even when a body of a metal material is formed.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment can realize the wireless power function even when the main body of the metal material is formed, and at the same time, the durability can be improved.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment can realize a wireless power function even when the body of a metal material is formed, and at the same time, the heat dissipation characteristic can be improved.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment can realize both the wireless power function and the charging method of the induction method and the resonance method at the same time, even when the main body of the metal material is formed.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment can realize the wireless power function even when the main body of the metal material is formed, and minimize the interference between the charging antenna and the coil.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment can realize the wireless power function even when the main body of the metal material is formed, and at the same time, Can be expanded.

In addition, the wireless power transmitter or the wireless power receiver according to the embodiment can realize a wireless power function even when the body of a metal material is formed, and at the same time, the length of the coil Can be designed to be long, and the charging efficiency can be increased.

Claims (24)

An AC-DC rectifier for rectifying an AC current received from a power source;
A DC-DC converter for converting the rectified DC current;
A DC-AC converter that converts the converted DC current into an AC current;
A transmission coil for transmitting the AC current converted from the DC-AC converter;
And a main body including the AC-DC rectifier, the DC-DC converter, and the DC-AC converter,
Wherein the transmit coil surrounds a side of the body. The method according to claim 1,
And a side surface of the body is constituted by the transmission coil. The method according to claim 1,
A circuit section including the AC-DC rectifier, the DC-DC converter, and the DC-AC converter;
Further comprising a shielding layer disposed between the transmitting coil and the circuit portion,
Wherein the transmission coil is spaced apart from the main body by a predetermined distance,
And air is circulated through the predetermined interval to the circuitry. The method according to claim 1,
Wherein the transmission coil is spaced apart from the main body by a predetermined distance,
And a shielding agent disposed at the predetermined interval. The method according to claim 1,
Wherein the transmit coil comprises an inductive coil and a resonant coil. The method of claim 5,
And a side surface of the body is constituted by the induction coil and the resonance coil. The method of claim 5,
Wherein the induction coil and the resonance coil surround the body so as not to overlap with each other. The method of claim 7,
Wherein the induction coil surrounds a part of a side surface of the main body,
The resonant coil surrounding another portion of the side of the body. The method of claim 7,
Wherein the induction coil surrounds the side surface of the main body so as to be spaced apart by a predetermined distance between the induction coils,
Wherein the resonant coil surrounds a portion spaced between the induction coils. The method of claim 5,
Wherein the induction coil surrounds the outside or inside of the side surface of the main body,
Wherein the resonant coil surrounds the interior or exterior of a side of the body. The method of claim 10,
Wherein the induction coil surrounds the outside or inside of the side surface of the main body so as to be spaced apart by a predetermined distance between the induction coils,
Wherein the resonant coil surrounds a portion of the side surface of the body that is spaced apart from the induction coil. The method of claim 10,
A circuit section including the AC-DC rectifier, the DC-DC converter, and the DC-AC converter;
Further comprising a shielding layer disposed between the transmitting coil and the circuit portion,
Wherein the induction coil surrounds the outside or inside of the side surface of the main body so as to be spaced apart by a predetermined distance between the induction coils,
The resonance coil surrounds the outside or inside of the side surface of the main body so as to be spaced apart from each other by a predetermined gap between the induction coils,
And air is circulated through the predetermined interval to the circuitry. A receiving coil for wirelessly receiving AC power from a wireless power transmitter;
An AC-DC rectifier for rectifying the received AC current;
A DC-DC converter for converting the rectified DC current;
A load to be charged with the converted direct current;
And a main body including the AC-DC rectifier, the DC-DC converter, and the load,
The receiving coil surrounding a side of the body. 14. The method of claim 13,
And a side surface of the body is constituted by the receiving coil. 14. The method of claim 13,
The AC-DC rectifier, the DC-DC converter, the circuit portion including the load;
Further comprising a shielding layer disposed between the receiving coil and the circuit portion,
The receiving coil is spaced apart by a predetermined distance to surround the main body,
And air is circulated through the predetermined interval to the circuitry. 14. The method of claim 13,
Wherein the transmission coil is spaced apart from the main body by a predetermined distance,
And a shielding agent disposed at the predetermined interval. 14. The method of claim 13,
Wherein the receive coil comprises an inductive coil and a resonant coil. 18. The method of claim 16,
And a side surface of the body is constituted by the induction coil and the resonance coil. 18. The method of claim 16,
Wherein the induction coil and the resonant coil surround the body such that they do not overlap each other. The method of claim 19,
Wherein the induction coil surrounds a part of a side surface of the main body,
The resonant coil surrounding another portion of the side of the body. The method of claim 19,
Wherein the induction coil surrounds the side surface of the main body so as to be spaced apart by a predetermined distance between the induction coils,
Wherein the resonant coil surrounds a portion spaced apart from the induction coil. 18. The method of claim 17,
Wherein the induction coil surrounds the outside or inside of the side surface of the main body,
Wherein the resonant coil surrounds the interior or exterior of a side of the body. 23. The method of claim 22,
Wherein the induction coil surrounds the outside or inside of the side surface of the main body so as to be spaced apart by a predetermined distance between the induction coils,
Wherein the resonant coil surrounds a portion of the side surface of the body that is spaced apart from the induction coil. 23. The method of claim 22,
The AC-DC rectifier, the DC-DC converter, the circuit portion including the load;
Further comprising a shielding layer disposed between the receiving coil and the circuit portion,
Wherein the induction coil surrounds the outside or inside of the side surface of the main body so as to be spaced apart by a predetermined distance between the induction coils,
The resonance coil surrounds the outside or inside of the side surface of the main body so as to be spaced apart from each other by a predetermined gap between the induction coils,
And air is circulated through the predetermined interval to the circuitry.

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