KR20160148239A - Apparatus for receiving wireless power and system for transmitting wireless power - Google Patents

Abstract

According to an embodiment of the present invention, a wireless power receiving apparatus comprises: a coil unit on a receiving side for receiving alternating current power from the wireless power receiving apparatus; an alternating current/direct current conversion unit on the receiving side for rectifying the received alternating current power into direct current power; and a direct current/direct current conversion unit on the receiving side for adjusting the direct current power. The direct current/direct current conversion unit can be arranged between the coil unit on the receiving side and the alternating current/direct current conversion unit on the receiving side. The wireless power receiving apparatus changes a configuration of the wireless power receiving apparatus to prevent a thermal runaway phenomenon.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless power receiving apparatus and a wireless power transmission system,

The present invention relates to a wireless power receiving apparatus and a wireless power transmission system.

Recently, as the information and communication technology rapidly develops, a ubiquitous society based on information and communication technology is being made. In order for information communication devices to be connected anytime and anywhere, sensors equipped with a computer chip having a communication function must be installed in all facilities of the society. Therefore, power supply problems of these devices and sensors are becoming a new challenge. In addition, mobile devices such as a Bluetooth headset and a music player are rapidly increasing in addition to mobile phones, and charging the battery requires time and effort. As a way to solve this problem, wireless power transmission technology has recently attracted attention.

The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer Thereafter, a method of transmitting electric energy by radiating an electromagnetic wave such as a radio wave or a laser was tried. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

Until now, energy transmission using radio has been largely divided into a magnetic induction system, a magnetic resonance system, and a power transmission system using a short wavelength radio frequency.

In the magnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. As a technology, . The magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.

The self-resonance method is characterized by using an electric field or a magnetic field instead of using electromagnetic waves or currents. The self-resonance method is advantageous in that it is safe to other electronic devices or human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.

Short wavelength wireless power transmission - simply, the RF method - takes advantage of the fact that energy can be transmitted and received directly in the form of RadioWaves. This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.

Wireless power transmission technology can be applied not only to mobile, but also to various industries such as IT, railroad, and household appliance industry.

In recent years, the development of a transmitter having a combination of a magnetic induction method and a magnetic resonance method has been actively developed. This is because power can be supplied to the receiving unit irrespective of the type of the power supply system of the receiving unit.

On the other hand, as the amount of power to be transmitted from the wireless power transmission apparatus increases, the heat source generated inside the wireless power reception apparatus becomes larger, which causes a rise in temperature and a thermal runaway phenomenon occurs.

An object of the present invention is to provide a wireless power receiving apparatus and a wireless power transmission system for preventing a thermal runaway phenomenon by changing the configuration of a wireless power receiving apparatus for transmitting power received from a wireless power transmitting apparatus to a load.

An object of the present invention is to provide a wireless power receiving apparatus and a wireless power transmission system for preventing thermal runaway and improving transmission efficiency by dispersing a configuration for generating a heat source among wireless power receiving apparatuses.

A wireless power receiving apparatus according to an embodiment of the present invention includes a receiving side coil part for receiving AC power from the wireless power transmission device, a receiving side AC / DC converting part for rectifying the received AC power to DC power, And a receiving side DC / DC converting unit for adjusting the DC power, and the DC / DC converting unit may be disposed between the receiving side coil unit and the receiving AC / DC converting unit.

A wireless power transmission system according to an embodiment may include the wireless power receiving apparatus and a wireless power transmitting apparatus for transmitting power to the wireless power receiving apparatus.

INDUSTRIAL APPLICABILITY The present invention has the effect of preventing the thermal runaway phenomenon by dispersing the configuration of the wireless power receiving apparatus and improving the transmission efficiency of the receiving apparatus.

Further, it is possible to control the AC / DC converting section and the DC / DC converting section of the receiving apparatus, thereby improving the transmission efficiency.

1 is a magnetic induction equivalent circuit.
2 is a self-resonant-type equivalent circuit.
3A and 3B are block diagrams showing a transmitter as one of sub-systems constituting a wireless power transmission system.
4 is a block diagram illustrating a receiving unit as one of the subsystems constituting the wireless power transmission system.
5 is a block diagram showing a conventional receiving unit.
FIG. 6 is a graph illustrating a power loss according to a current of a conventional receiving unit.
7 is an image obtained by photographing a part of a conventional receiving section with a thermal imaging camera.
8 is a block diagram illustrating a receiver according to an embodiment of the present invention.
9 is a block diagram illustrating a receiver according to another embodiment of the present invention.

Hereinafter, a wireless power transmission system including a transmitter having a function of transmitting power wirelessly and a receiver receiving power wirelessly according to an embodiment of the present invention will be described in detail with reference to the drawings. 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 may include a communication system that selectively uses various types of frequency bands from a low frequency (50 kHz) to a high frequency (15 MHz) for wireless power transmission and can exchange data and control signals for system control .

The embodiments can be applied to various 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, and a robot industry .

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

According to the embodiment, 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 smart phone or a notebook is used on the table, the battery is automatically charged and can be used for a long time . 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 examples are as follows.

Wireless Power Transfer System: A system that provides wireless power transmission within a magnetic field region

Wireless Power Transfer System-Charger: A device that provides wireless power transmission to a power receiver within a magnetic field area and manages the entire system.

Wireless Power Transfer System-Device: A device that is provided with a wireless power transmission from a power transmitter within a magnetic field area.

Charging Area: A region where actual wireless power transmission occurs within the magnetic field region, and may vary depending on the size, required power, and operating frequency of the application product.

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

Quality factor Q: 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.

The principles of wireless power transmission include magnetic induction and self-resonance.

The magnetic induction method is a noncontact energy transfer technique in which an electromotive force is generated in the load inductor Ll via a magnetic flux generated when the source inductor Ls and the load inductor Ll are brought close to each other and a current is supplied to one of the source inductors Ls. to be. 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 a magnetic induction equivalent circuit.

Referring to FIG. 1, in a magnetic 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 with a receiving unit, And a load coil Rl for an impedance matching and a load coil Ll for magnetic coupling with a transmitting unit. The load coil Rl may be implemented as a source coil Ls for impedance matching, And the degree of magnetic coupling between the source coil Ls and the load coil Ll can be expressed by mutual inductance Msl.

In FIG. 1, the ratio S21 of the input voltage to the output voltage is obtained from the magnetic induction equivalent circuit consisting only of the coil without the source capacitor Cs and the load capacitor Cl for impedance matching, The power transmission condition satisfies Equation (1) below.

[Equation 1]

Ls / Rs = L1 / R1

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 capable of compensating for reactance in a system in which there is 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 is transmitted, and the mutual inductance Msl, The power transfer efficiency can vary greatly depending on the value. Therefore, the source capacitor Cs can be added to the transmission section as the compensation capacitor for impedance matching, and the load capacitor Cl can be added to the reception section. The compensation capacitors Cs and Cl may be connected in series or in parallel to the receiving coil Ls and the load coil Ll, respectively. For 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 a self-resonant-type equivalent circuit.

2, in the self-resonant type equivalent circuit, a transmitter 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 transmission line L1 and the transmission-side resonance capacitor C1, and the reception unit is realized by a series connection of the load resistance Rl and the load inductor Ll, Side resonance coil constituting a closed circuit by a series connection of a load coil constituting a receiving side resonance inductor L2 and a receiving side resonance capacitor C2 and a receiving side resonance coil constituting a closed circuit constituted by a source inductor Ls and a transmitting side inductor L1 are magnetically coupled to each other by a coupling coefficient of K01 and the load inductor L1 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 L1 and the reception side resonance inductor L2, (L2) is the coupling coefficient of L12, . 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 two resonators have the same resonance frequency, most of the energy of the resonator of the transmitter is transmitted to the resonator of the receiver so that the power transfer efficiency can be improved, and the efficiency in the self resonance method satisfies Equation When it gets better.

&Quot; (2) "

k / Γ >> 1 (k is the coupling coefficient, Γ 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.

<Transmitter>

FIGS. 3A and 3B are block diagrams showing a transmitter as one of subsystems configuring a wireless power transmission system.

Referring to FIG. 3A, a wireless power transmission system according to an embodiment of the present invention may include a transmitter 1000 and a receiver 2000 that receives power wirelessly from the transmitter 1000. FIG. The transmission unit 1000 includes a power conversion unit 101 for converting an input AC signal into an AC signal and outputting the AC signal as an AC signal, a transmission unit 101 for generating a magnetic field based on the AC signal output from the power conversion unit 101, The power conversion unit 101 and the power conversion unit 101. The resonance circuit unit 102 and the power conversion unit 101 are connected to the power conversion unit 101 and the power conversion unit 101, And a control unit 103 for sensing impedance, voltage and current information from the power conversion unit 101 and the resonant circuit unit 102 and wirelessly communicating with the receiving unit 2000 can do. The power conversion unit 101 may include at least one of a power conversion unit that converts an AC signal to DC, a power conversion unit that outputs a DC by varying the level of the DC, and a power conversion unit that converts DC into AC . The resonance circuit unit 102 may include a coil and an impedance matching unit capable of resonating with the coil. The control unit 103 may include a sensing unit and a wireless communication unit for sensing impedance, voltage, and current information.

 3B, the transmitting unit 1000 includes a transmitting side AC / DC converting unit 1100, a transmitting side DC / AC converting unit 1200, a transmitting side impedance matching unit 1300, a transmitting coil unit 1400 And a transmission side communication and control unit 1500. [

The transmitting side AC / DC converting unit 1100 is a power converting unit for converting an AC signal provided from the outside under the control of the transmitting side communication and control unit 1500 to a DC signal. The transmitting side AC / DC converting unit 1100 includes: May include a rectifier 1110 and a transmission side DC / DC converter 1120 as a subsystem. 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 a hybrid rectifier capable of saving space and having a high degree of freedom in 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 adjusts the level of the DC signal provided from the rectifier 1110 under the control of the transmitting side communication and control unit 1500. As an example of implementing the DC signal, A buck converter, a boost converter that boosts the level of the input signal, a buck-boost converter or a Cuk converter that can raise or lower the level of the input signal. Also, the transmission side DC / DC converter 1120 includes a switch element that performs a power conversion control function, an inductor and a capacitor that perform a power conversion medium function or an output voltage smoothing function, a voltage gain control function or an electrical isolation function (insulation function) And may have a function of removing a ripple component or a 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 converting unit 1120 and the actual output value can be adjusted through the feedback method and can be performed by the transmitting side communication and control unit 1500 .

The transmission side DC / AC conversion unit 1200 converts the 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 outputs the converted AC signal frequency A half bridge inverter or a full bridge inverter is an example of implementing this system. 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 transmission side DC / AC conversion unit 1200 may include an oscillator for generating a frequency of an output signal and a power amplifier for amplifying an output signal.

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 unit 1000 and the receiving unit 2000 are spatially separated and the leakage of the magnetic field is large, the impedance difference between the two connecting ends of the transmitting unit 1000 and the receiving unit 2000 is corrected, . The impedance matching unit 1300 may include 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, The impedance value 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 may have an inductive coupling between the transmission unit 1000 and the reception unit 2000 The energy loss can be minimized by increasing the coefficient. 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 unit 1000 and the reception unit 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 characteristics of the coil due to the mutual influence by the device of the capacitor, A matching method, a method using a multi-loop, and the like.

The transmitting coil 1400 may be implemented as a plurality of coils or a plurality of coils. If a plurality of transmitting coils 1400 are provided, they may be spaced apart from each other, The overlapping area can be determined in consideration of the deviation of the magnetic flux density. Also, when the transmission coil 1400 is manufactured, it can be manufactured in consideration of the internal resistance and the 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 1510 and a transmission side communication unit 1520. The transmission-side controller 1510 may control the output voltage of the transmission-side AC / DC converter 1100 in consideration of the power demand of the receiver 2000, the current charge amount, and the wireless power scheme. The frequency and switching waveforms for driving the transmission side DC / AC conversion unit 1200 may be generated in consideration of the maximum power transmission efficiency to control power to be transmitted. Also, the overall operation of the receiver 2000 can be controlled by using an algorithm, a program, or an application required for the control read from the storage unit (not shown) of the receiver 2000. Meanwhile, the transmission-side controller 1510 may be referred to as a microprocessor, a microcontroller unit, or a microcomputer. The transmission-side communication unit 1520 can perform communication with the reception-side communication unit 2620, and can use a short-distance communication scheme such as Bluetooth, NFC, Zigbee, etc. as a communication scheme. The transmission side communication unit 1520 and the reception side communication unit 2620 can transmit and receive the charging status information and the charging control command to each other. The charging status information may include the number of the receiving unit 2000, the remaining battery level, the number of times of charging, the amount of usage, the battery capacity, the battery ratio, and the transmission power amount of the transmission unit 1000. Side communication unit 1520 can transmit a charging function control signal for controlling the charging function of the receiving unit 2000 and the charging function control signal controls the receiving unit 2000 to enable or disable the charging function And may be a control signal for disabling the control signal.

As described above, the transmitting-side communication unit 1520 may be communicated in an out-of-band format, which is a separate module, but the present invention is not limited thereto. And may perform communication in an in-band format using a feedback signal to be transmitted to a transmitter. For example, the receiver may modulate the feedback signal to transmit information such as start of charge, end of charge, battery condition, etc. to the transmitter through a feedback signal. The transmission side communication unit 1520 may be configured separately from the transmission side control unit 1510 and the reception side communication unit 2620 may be included in the control unit 2610 of the reception device or may be separately configured have.

In addition, the transmitter 1000 of the wireless power transmission system according to the embodiment may further include a detector 1600.

The detecting unit 1600 detects an input signal of the transmitting side AC / DC converting unit 1100, an output signal of the transmitting side AC / DC converting unit 1100, an input signal of the transmitting side DC / AC converting unit 1200, 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 transmission side coil 1400). &Lt; / RTI &gt; The detected signal is fed back to the communication and control unit 1500 and the communication and control unit 1500 controls the transmission side AC / DC conversion unit 1100, the transmission side DC / AC conversion unit 1200, the transmission side impedance matching The control unit 1300 can be controlled. Also, the communication and control unit 1500 can perform a foreign object detection (FOD) based on the detection result of the detection unit 1600. And the detected signal may be at least one of a voltage and a current. Meanwhile, the detection unit 1600 may be implemented by hardware different from the communication and control unit 1500, or may be implemented by one hardware.

<Receiver>

4 is a block diagram illustrating a receiving unit as one of the subsystems constituting the wireless power transmission system.

4, the wireless power transmission system may include a transmitting unit 1000 and a receiving unit 2000 receiving radio power from the transmitting unit 1000. The receiving unit 2000 includes a receiving coil unit 2100 A receiving side AC / DC converting portion 2300, a receiving side DC / DC converting portion 2400, a load 2500, and a receiving side communication and controlling portion 2600. The receiving side AC / DC converting portion 2300 includes a receiving side impedance matching portion 2200, have.

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. The receiving side coil part 2100 may be equipped with a near field communication (NFC) antenna. 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 be changed according to the electrical characteristics of the receiving part 2000. [

The receiving-side impedance matching unit 2200 performs impedance matching between the transmitting unit 1000 and the receiving unit 2000.

The receiving-side AC / DC converter 2300 rectifies the AC signal output from the receiving-side coil part 2100 to generate a DC signal.

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 may include a battery, a display, a voice output circuit, a main processor, and various sensors.

The receiving side communication and control unit 2600 can be activated by the wake-up power from the transmitting side communication and control unit 1500 and performs communication with the transmitting side communication and control unit 1500, The operation of the system can be controlled.

The receiving unit 2000 includes a single or a plurality of receiving units 2000, and can simultaneously receive energy from the transmitting unit 1000 wirelessly. That is, in the self-resonant wireless power transmission system, a plurality of target receivers 2000 can receive power from one transmitter 1000. At this time, the transmitter matching unit 1300 of the transmitter 1000 may adaptively perform impedance matching between the plurality of receivers 2000. 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.

When the receiving unit 2000 includes a plurality of units, the power receiving systems may be the same system or different types of systems. In this case, the transmitting unit 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 a wireless power transmission of a magnetic induction type, the transmission side AC / DC conversion unit 1100 in the transmission unit 1000 may transmit data of several tens or hundreds of V (for example, (For example, 10 V to 20 V) and can output a DC signal of several V to several tens V and several hundred V (for example, 10 V to 20 V) by receiving an AC signal of several tens or several hundred Hz Side DC / AC converting unit 1200 can receive an AC signal and output an AC signal of KHz band (for example, 125 KHz). The receiving AC / DC converting unit 2300 of the receiving unit 2000 receives AC signals of KHz band (for example, 125KHz) and receives DC signals 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 the DC signal 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 unit 1000 may transmit power of several tens or several hundreds Hz (for example, 110 V to 220 V) And the transmission side DC / AC conversion unit 1200 converts the DC signal into a DC signal of several V to several tens V and several hundred V (for example, 10V to 20V) And can output an AC signal of MHz band (for example, 6.78 MHz). The receiving AC / DC converting unit 2300 of the receiving unit 2000 receives AC signals of MHz (for example, 6.78 MHz) and receives AC signals of several V to several tens V, several hundred V (for example, 10 V to 20 V) DC converter 2400 can output a DC signal of, for example, 5V suitable for the load 2500 and transmit it to the load 2500. The DC /

5 is a block diagram showing a conventional receiving unit.

5, the receiving unit 2000 includes a receiving side coil part 2100 including a plurality of coils, a receiving side AC / DC converting part 2300, a receiving side DC / DC converting part 2400, a receiving side communication And a control unit 2600. The conventional receiving side AC / DC converting section 2300 is generally disposed between the receiving side coil section 2100 and the receiving side DC / DC converting section 2400.

However, as the amount of power transmitted from the wireless power transmission apparatus increases, the arrangement of the wireless power transmission apparatus increases the heat source generated in the receiving unit 2000, thereby causing thermal runaway. The phenomenon of thermal runaway refers to a phenomenon in which a rise in temperature causes an increase in current and an increase in current causes a temperature rise in a kind of chain reaction. In particular, referring to FIG. 6 and FIG. 7, it can be seen that a thermal runaway phenomenon occurs in the receiving-side AC / DC converting unit 2300 in the configuration of the receiving unit 2000.

FIG. 6 is a graph illustrating a power loss according to a current of a conventional receiving unit.

6A is a graph of the power loss of the entire receiver 2000. FIG. 6B is a graph illustrating power loss of the receiver AC / DC converter 2300 of the receiver 2000, / DC converting unit 2400 shown in FIG.

6B, the receiving-side AC / DC converter 2300 corresponds to the graph a, and the power loss continuously increases as the current increases. The receiving-side DC / DC converter 2400 converts b, and the power loss can be smaller than that of the receiving-side AC / DC converter 2300 without affecting the magnitude of the current.

That is, it can be experimentally confirmed that the receiving AC / DC converter 2300 increases the power loss as the current increases, thereby greatly influencing the thermal runaway phenomenon.

7 is an image obtained by photographing a part of a conventional receiving section with a thermal imaging camera.

Referring to FIG. 7, an image obtained by top-view photographing a receiving unit 2000 driven for 3 hours with a thermal imaging camera. The first region R1 is a circular shape having a radius of 8 mm or more and 12 mm or less and is the highest temperature (for example, the maximum temperature: 62 [deg.]) To the place where the receiving side coil part 2100 and the receiving side AC / DC converting part 2300 are disposed May also occur. The second region R2 is a circular shape having a radius of 18 mm or more and 22 mm or less and the third region R3 is a portion where the receiving side coil portion 2100 is disposed. The first region R1 and the second region R2 ) May occur.

That is, a thermal runaway phenomenon occurs in the first area R1 where the receiving side coil part 2100 and the receiving side AC / DC converting part 2300 overlap, and the receiving side AC / DC converting part 2300 (For example, 20 mm or more) outside the second region R2 and disposed in a region spaced apart from the receiving-side coil portion 2100, the thermal runaway phenomenon can be prevented.

8 is a block diagram illustrating a receiver according to an embodiment of the present invention.

8, the receiving unit 2000 includes a receiving side coil part 2100 including a plurality of receiving coils, a receiving side DC / DC converting part 2400, a receiving side AC / DC converting part 2300, a load 2500).

In the embodiment, the receiving side coil part 2100 is disposed on the upper side of the receiving part 2000, the receiving side AC / DC converting part 2300 is disposed apart from the receiving side coil part 2100, and the receiving side DC / DC conversion section 2400 may be disposed between the reception side coil section 2100 and the reception side AC / DC conversion section 2300.

The interval L4 between the receiving side coil part 2100 and the receiving side AC / DC converting part 2300 may be half or more of the longitudinal width L2 of the receiving side coil part. For example, the interval L4 between the receiving side coil part 2100 and the receiving side AC / DC converting part 2300 when the lateral width L1 of the receiving side coil part is 35 mm and the longitudinal width L2 is 45 mm, But the present invention is not limited thereto. The distance L3 between the receiving side coil part 2100 and the receiving side DC / DC converting part 2400 may be 10 mm or more, but the present invention is not limited thereto.

In addition, in the embodiment, the receiving unit 2000 may control the reception side AC / DC conversion unit 2300 and the reception side DC / DC conversion unit 2400 by the user by dispersing and arranging the respective components other than one- It can be possible.

9 is a block diagram illustrating a receiver according to another embodiment of the present invention.

9, the receiving unit 2000 includes a receiving side coil part 2100 including a plurality of receiving coils, a receiving side DC / DC converting part 2400, a receiving side AC / DC converting part 2300, a load 2500). The receiving-side AC / DC converting unit 2300 may include a receiving-side AC / DC converting unit for controlling the receiving-side AC / DC converter 2330 and the receiving-side AC / DC converter 2330.

In the embodiment, the receiving side coil part 2100 is disposed on the upper side of the receiving part 2000, and the receiving side AC / DC converting part 2300 can be disposed apart from the receiving side coil part 2100.

The receiving-side DC / DC converting section 2400 may be disposed between the receiving-side coil section 2100 and the receiving-side AC / DC converter 2330. The receiving-side AC / DC conversion control section 2310 may be disposed between the receiving-side coil section 2100 and the receiving-side AC / DC converter 2330.

The interval L3 between the receiving side coil part 2100 and the receiving side AC / DC converter 2330 may be half or more of the longitudinal width L2 of the receiving side coil part, and for example, The interval L3 between the reception side coil part 2100 and the reception side AC / DC conversion controller 2330 may be 20 mm or more when the length L1 is 35 mm and the length L2 is 45 mm, no. The distance between the receiving side coil part 2100 and the receiving side AC / DC conversion control part 2310 and the distance between the receiving side coil part 2100 and the receiving side DC / DC converting part 2400 may be 10 mm or more It is not limited thereto.

That is, in the wireless power receiving apparatus according to the embodiment of the present invention, the receiving side coil part and the receiving side AC / DC converting part of the receiving part 2000 are disposed in a distributed manner to prevent the internal temperature rise of the wireless power receiving device, And the transmission efficiency can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

101; A power conversion unit 102; The resonance circuit
103; A control unit 1100; The transmitting side AC / DC converting section
1110; Rectifier 1120; The transmitting side DC / DC converting section
1300; A transmission-side impedance matching unit 1400; Transmitting coil part
1500; Side communication and control unit 1510; The transmission-
1520; A transmission side communication unit 1600; The detection unit
2000; A receiving unit 2100; Receiving side coil part
2200; A receiving-side impedance matching unit 2300; The receiving-side AC / DC converting section
2400; A receiving side DC / DC converter 2500; Load portion
2600; Side communication and control unit 2610; The receiving-
2620; The receiving-

Claims (12)

A wireless power receiving apparatus for receiving power from a wireless power transmission apparatus and transmitting the power to a load,
A receiving side coil part for receiving AC power from the wireless power transmission device;
A receiving-side AC / DC converting unit for rectifying the received AC power to DC power; And
And a receiving side DC / DC converting unit for adjusting the DC power,
And the DC / DC converting unit is disposed between the receiving-side coil unit and the receiving-side AC / DC converting unit. The method according to claim 1,
Wherein the receiving-side coil portion includes a plurality of receiving coils,
Wherein the interval between the receiving-side coil part and the receiving-side AC / DC converting part is at least half the vertical width of the receiving-side coil part. The method according to claim 1,
And the interval between the receiving-side coil part and the receiving-side AC / DC converting part is 20 mm or more. The method according to claim 1,
And the distance between the receiving-side coil part and the receiving-side DC / DC converting part is 10 mm or more. The method according to claim 1,
Wherein the receiving-side AC / DC converting unit comprises:
A receiving-side AC / DC converter for receiving the AC power from the receiving-side coil part and rectifying it by DC power; And
And a receiving-side AC / DC conversion control unit for controlling the receiving-side AC / DC converter. 6. The method of claim 5,
Wherein the receiving-side AC / DC conversion control section is disposed between the receiving-side coil section and the receiving-side AC / DC converter. 6. The method of claim 5,
Wherein the receiving-side DC-DC converting unit is disposed between the receiving-side coil unit and the receiving-side AC / DC converter. 6. The method of claim 5,
Wherein the interval between the receiving-side coil part and the receiving-side AC / DC converter is at least half the vertical width of the receiving-side coil part. 6. The method of claim 5,
And the interval between the receiving-side coil part and the receiving-side AC / DC conversion controller is 20 mm or more. 6. The method of claim 5,
And the interval between the reception side coil part and the reception side AC / DC conversion control part is 10 mm or more. 6. The method of claim 5,
And the distance between the receiving-side coil part and the receiving-side DC / DC converting part is 10 mm or more. A wireless power receiving apparatus according to any one of claims 1 to 11; And
And a wireless power transmission device for transmitting power to the wireless power reception device.

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