KR20160063004A - Apparatus for wireless power transmission - Google Patents

Abstract

Wireless power transmission and reception devices are provided. The wireless power transmission device which wirelessly transmits power to the wireless power reception device according to an embodiment of the present invention comprises: a converter which converts input voltage and outputs direct current voltage; an inverter which is connected to the converter and converts the direct current voltage output from the converter, into alternating current power; a transmission resonator which is connected to the inverter and transmits the alternating current power in a magnetic resonance manner; a transmission inducer which is connected to the transmission resonator and transmits the alternating current power in a magnetic induction manner; and a transmission control unit which controls the inverter to generate an active frequency, and activates one of the transmission resonator and the transmission inducer by the active frequency.

Description

[0001] Apparatus for wireless power transmission [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission and reception apparatus, and more particularly, to a wireless power transmission and reception apparatus that wirelessly transmits or receives power using magnetic induction and self-resonance.

[0002] Instead of a method of supplying electrical energy to a wireless power receiving apparatus by wire, a method of wirelessly supplying electric energy without contact has been used.

In the 1800s, electric motors and transformers using electromagnetic induction principles began to be used, and then radio waves and lasers were used to transmit the electric energy to the desired devices wirelessly. A method of transmitting electrical energy by radiating the same electromagnetic wave has also been attempted. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

1 and 2 are circuit diagrams schematically showing a configuration of a conventional wireless power transmission apparatus.

Referring to FIG. 1, a wireless power transmission apparatus 12 using magnetic induction includes a buck converter 120, an inverter 122, and a magnetic induction transmitter 124.

The buck converter 120 outputs a DC voltage lower than the input voltage and the inverter 122 is connected to the buck converter 120 to convert the output DC voltage into AC power. And transmits the power in a manner as described above.

Here, the magnetic induction method is a method of inducing a current from one coil to another by using a phenomenon that a voltage is induced and a current flows when a magnetic field is changed around a conductor.

On the other hand, the magnetic induction method has been rapidly commercialized mainly in small-sized devices, but it is very sensitive to the distance between the coils and the relative position thereof, so that the transmission efficiency drops rapidly even if the distance between the two coils is slightly reduced or not. And there is a problem that can cause a dangerous heat.

2, the wireless power transmission apparatus 11 using self-resonance includes a boost converter 110, an inverter 112, and a self-resonant transmitter 114. [

The boost converter 110 outputs a DC voltage higher than the input voltage, the inverter 112 is connected to the boost converter 110 to convert the DC voltage into AC power, and the self- And transmits the power in a manner as described above.

Here, the self-resonance method is based on the combination of attenuation waves in which electromagnetic waves travel from one medium to another medium through a near-field electromagnetic field when the two media resonate at the same frequency, It is how it is delivered.

On the other hand, the self-resonance method can transmit energy to a far distance as compared with the magnetic induction method, so that a high transmission efficiency can be obtained even at a distance of a few meters, but the volume of the transmitting or receiving induction unit is large and a lot of heat is generated.

Therefore, in order to solve the above problems, development of a technique for using a magnetic induction system and a magnetic resonance system in combination is required.

Korean Patent Publication No. 10-2011-0133813 (December 14, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a wireless power transmission and reception apparatus that wirelessly transmits or receives power by mixing a magnetic induction method and a magnetic resonance method.

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

According to an aspect of the present invention, there is provided a wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus, the wireless power transmission apparatus comprising: a converter for converting an input voltage to output a direct current voltage; An inverter connected to the converter for converting the DC voltage output from the converter into AC power; A transmission resonator connected to the inverter for transmitting the AC power in a self-resonant manner; A transmission inducer connected to the transmission resonator and configured to transmit the AC power in a magnetic induction manner; And a transmission control unit for controlling the inverter to generate an active frequency and activating one of the transmission resonator and the transmission induction unit by the active frequency.

The transmission resonator may include a transmission switch for conducting or non-conducting the transmission resonator.

In addition, the converter may include a buck-boost converter that outputs a first DC voltage higher than the input voltage or a second DC voltage lower than the input voltage.

The transmission control unit may control the buck-boost converter to output the first DC voltage when the wireless power receiving apparatus is a self resonance system, and when the wireless power receiving apparatus is a magnetic induction system, The buck-boost converter can be controlled to output the second DC voltage.

The transmission control unit may control the inverter to generate the first active frequency through the DC voltage output from the converter when the wireless power receiving apparatus is a self resonance system, And the wireless power receiving apparatus is a magnetic induction system. The inverter controls the inverter to generate the second active frequency through the DC voltage output from the converter, and turns off the transmission switch to activate the transmission inducing unit.

In addition, the first active frequency may be 6.78 MHz, and the second active frequency may be 110 kHz or more and 357 kHz or less.

The transmission resonator may include a first resonant capacitor and a first resonant coil connected in series with the first resonant capacitor.

The transmission inducing unit may include a first inductive capacitor connected in series to the transmission resonator and a second inductive coil connected in parallel to the transmission resonator.

Also, the transmission resonator may be impedance matched to the high frequency in comparison with the transmission induction unit.

According to an aspect of the present invention, there is provided a wireless power receiving apparatus for wirelessly receiving power from a wireless power transmission apparatus, the wireless power receiving apparatus comprising: a receiving induction unit for receiving power in a magnetic induction manner; A reception resonator connected to the reception inducing unit and receiving power in a self-resonant manner; And a reception controller for activating one of the reception inductor and the reception resonator according to an active frequency of the power transmission device.

The reception resonator may include a reception switch for conducting or non-conducting the reception resonator.

When the radio power transmission apparatus is of the self-resonance type, the reception control unit activates the reception resonator by turning on the reception switch. When the radio power transmission apparatus is of a magnetic induction type, the reception control unit turns off the switch, The reception inducing unit can be activated.

In addition, the reception resonator may include a second resonant capacitor and a second resonant coil connected in series with the second resonant capacitor.

The reception inducing unit may include a second induction capacitor connected in series with the reception resonator, and a second induction coil connected in parallel with the reception resonator.

In addition, the reception resonator may be impedance matched to the high frequency in comparison with the reception induction unit.

Other specific details of the invention are included in the detailed description and drawings.

The above-described wireless power transmitting and receiving apparatus of the present invention has one or more of the following effects.

According to the present invention, it is possible to transmit or receive power wirelessly by mixing a magnetic induction method and a self-resonance method.

1 and 2 are circuit diagrams schematically showing a configuration of a conventional wireless power transmission apparatus.
3 is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.
4 is a schematic diagram of a wireless power transmission apparatus according to an embodiment of the present invention.
5 is a circuit diagram schematically showing a configuration of a wireless power transmission apparatus according to an embodiment of the present invention.
FIG. 6 and FIG. 7 are graphs showing changes in impedance with respect to frequencies of a transmission resonator and a transmission inductor according to an embodiment of the present invention.
8 is a block diagram of a wireless power receiving apparatus according to an embodiment of the present invention.
9 is a circuit diagram schematically showing a configuration of a wireless power receiving apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Also, terms used herein are for the purpose of illustrating embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It should be understood that the terms comprising and / or comprising the terms used in the specification do not exclude the presence or addition of one or more other elements, steps and / or operations in addition to the stated elements, steps and / use. And "and / or" include each and any combination of one or more of the mentioned items.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 3 is a block diagram of a wireless power transmission apparatus according to an exemplary embodiment of the present invention. FIG. 4 is a schematic diagram of a wireless power transmission apparatus according to an exemplary embodiment of the present invention. Fig. 3 is a circuit diagram schematically showing a configuration of a wireless power transmission apparatus. Fig.

6 and 7 are graphs showing changes in impedance with respect to frequencies of a transmission resonator and a transmission inductor according to an embodiment of the present invention.

3 to 5, a wireless power transmission apparatus 20 according to an exemplary embodiment of the present invention includes a converter 210, an inverter 220, a transmission resonator 230, (250), but does not exclude additional configurations.

The wireless power transmission apparatus 20 can transmit the necessary power to the wireless power reception apparatus 30 wirelessly. At this time, the wireless power transmission apparatus 20 is a wireless charging apparatus that charges the wireless power reception apparatus 30 The present invention is not limited thereto and the wireless power transmission apparatus 20 may be embodied as various types of apparatuses that transmit power to the wireless power receiving apparatus 30 that requires power without being in contact with the wireless power receiving apparatus 30 .

The converter 210 converts the input voltage to output a DC voltage.

At this time, the converter 210 may include a buck-boost converter (210).

The buck-boost converter 210 may output a first DC voltage higher than the input voltage or a second DC voltage lower than the input voltage by stepping down or boosting the input DC power.

The inverter 220 is connected to the converter 210 to convert the DC voltage output from the converter into AC power.

At this time, the inverter 220 can convert the DC voltage output from the converter 210 into AC power having a first active frequency of a high frequency or a second active frequency of a low frequency.

When the converter 210 is a buck-boost converter, the inverter 220 converts the first DC voltage output from the buck-boost converter 210 to AC power having a first high frequency active frequency, The second DC voltage output from the boost converter 210 can be converted into AC power having a second active frequency that is a low frequency.

Here, the first active frequency may be 6.78 MHz and the second active frequency may be 110 kHz or more and 357 kHz or less. However, if the first active frequency is a higher frequency than the second active frequency, .

The transmission resonator 230 is connected to the inverter 220 and transmits the AC power converted by the inverter 220 to the wireless power receiving device in a self resonance manner.

), 제1 공진 코일(

) 및 송신 스위치(

)를 포함할 수 있다.Referring to FIG. 5, the transmission resonator 230 includes a first resonant capacitor

), A first resonance coil (

) And a transmission switch

).

) 및 제1 공진 코일(

)은 송신 공진기(230)가 제1 활성 주파수에 적합하도록 임피던스 매칭 설계될 수 있다.At this time, the first resonance capacitor (

And the first resonant coil (

May be designed to match the impedance of the transmitting resonator 230 to match the first active frequency.

) 및 제1 공진 코일(

)은 송신 공진기(230)가 6.78MHz 주파수에 적합하도록 임피던스를 매칭 설계될 수 있다. 즉, 송신 공진기(230)는 6.78MHz 주파수 부근에서 가장 낮은 임피던스를 가질 수 있다.For example, as shown in FIG. 6, the first resonant capacitor

And the first resonant coil (

May be designed to match the impedance so that the transmission resonator 230 is adapted to the 6.78 MHz frequency. That is, the transmission resonator 230 can have the lowest impedance near the 6.78 MHz frequency.

) 및 제1 공진 코일(

)은 본 발명의 기술분야에서 통상의 기술자가 적용 가능한 수치를 가지는 커패시터 및 코일을 포함한다.However, if the transmission resonator 230 can be impedance matched to the first active frequency, the first resonant capacitor 230

And the first resonant coil (

) Include capacitors and coils having numerical values applicable to those of ordinary skill in the art.

Here, the self resonance method means that the electromagnetic wave is moved from the transmission resonator 230 to the wireless power reception device through the near field by resonance of the transmission resonator 230 and the wireless power reception device at the same frequency.

)는 송신 공진기(230)를 도통 또는 비도통시킬 수 있다. 자세한 동작에 대하여는 후술한다.Transmission switch (

May turn on or off the transmission resonator 230. The detailed operation will be described later.

The transmission inducing unit 240 is connected to the transmission resonator 230 and transmits the AC power in a magnetic induction manner.

For example, referring to FIG. 4, the transmission inducer 240 may be located inside the transmission resonator 230 and the transmission inducer 240 and the transmission resonator 230 may be connected to improve space efficiency. However, It is to be understood that the invention is not limited to those precise embodiments.

) 및 송신 공진기(230)에 병렬 연결된 제1 유도 코일(

)을 포함한다.Referring to FIG. 5, the transmit inducer 240 includes a first inductive capacitor coupled in series to the transmit resonator 230

And a first induction coil connected in parallel to the transmission resonator 230

).

) 및 제1 유도 코일(

)은 송신 유도기(240)가 110kHz 이상 357kHz 이하 주파수에 적합하도록 임피던스 매칭 설계될 수 있다. 즉, 도 7에 도시된 바와 같이 송신 유도기(240)는 110kHz 주파수 부근에서 가장 낮은 임피던스를 가질 수 있으나, 이에 제한되지 않는다.For example, the first inductive capacitor (

) And the first induction coil (

May be designed to be impedance matching such that the transmission inducing unit 240 is suitable for a frequency of 110 kHz or more and 357 kHz or less. That is, as shown in FIG. 7, the transmission inducing unit 240 may have the lowest impedance in the vicinity of the 110 kHz frequency, but is not limited thereto.

) 및 제1 유도 코일(

) 본 발명의 기술분야에서 통상의 기술자가 적용 가능한 수치를 가지는 커패시터 및 코일을 포함한다.However, if the transmission inducing unit 240 can be impedance-matched to match the second active frequency, the first induction capacitor 240 provided in the transmission inducing unit 240

) And the first induction coil (

) ≪ / RTI > includes capacitors and coils having numerical values applicable to those of ordinary skill in the art.

)는 제1 유도 커패시터(

)보다 큰 임피던스를 갖도록 설계될 수 있다.At this time, the first resonance capacitor (

Is connected to the first inductive capacitor (

). ≪ / RTI >

Here, the magnetic induction method means that when a magnetic field around the transmission inducing unit 240 is changed, a voltage is induced in the wireless power receiving apparatus and a current flows.

The transmission controller 250 controls the inverter 220 to generate an active frequency and activates one of the transmission resonator 230 and the transmission inducer 240 according to the active frequency.

At this time, the transmission control unit 250 controls the distance between the wireless power transmission apparatus 20 and the wireless power reception apparatus 30 and / or the distance between the wireless power reception apparatus 30 and the wireless power reception apparatus 30 (for example, Resonance mode) and controls the inverter 220 and the transmission resonator 230 accordingly.

)를 ON시켜 송신 공진기(230)를 도통시킨다.For example, when the wireless power receiving apparatus 30 is a device that receives power using a self resonance method, the transmission control unit 250 generates a first active frequency through the DC voltage output from the converter 210 Controls the inverter (220), and the transmission switch

To turn on the transmission resonator 230. [

)이 오픈(open)되는 것과 동일한 현상이 일어나 제1 유도 코일(

)의 특성은 무시되고, 송신 유도기(240)의 제1 유도 커패시터(

)의 임피던스가 송신 공진기(230)의 제1 공진 커패시터(

)의 임피던스보다 작게 설계되어 제1 유도 커패시터(

)의 특성이 무시될 수 있으므로, 송신 공진기(230)만 활성화된다.In this case, since the transmission resonator 230 is impedance-matched to be suitable for a high frequency as compared with the transmission inducing device 240, the first induction coil of the transmission inducing device 240

) Is opened and the first induction coil (

) Is ignored and the first inductive capacitor (< RTI ID = 0.0 >

Is connected to the first resonant capacitor of the transmission resonator 230

) To be smaller than the impedance of the first inductive capacitor < RTI ID = 0.0 >

), The transmission resonator 230 is activated only.

)를 OFF시켜 송신 유도기(240)를 활성화 시킨다.Conversely, when the wireless power receiving apparatus 30 is a device that receives power using a magnetic induction method, the transmission control unit 250 controls the inverter 210 to generate a second active frequency through the DC voltage output from the converter 210 (220), and the transmission switch

) To turn off the transmission inducing unit 240.

At this time, the transmission controller 250 controls the ON / OFF speed of the switches M1 and M2 located in the inverter 220 to generate AC power having the first active frequency or the second active frequency in the inverter 220 The control method of the inverter 220 is not limited to this, provided that the transmission control unit 250 can control the inverter 220 to output the first active frequency or the second active frequency.

In addition, when converter 210 is a buck-boost converter, transmission controller 250 may control buck-boost converter 210.

That is, when the wireless power receiving apparatus 30 is a device that receives power using a self-resonant method, the transmission control unit 250 controls the buck-boost converter 210 to output the first DC voltage, When the receiving apparatus 30 is a device that receives power using a magnetic induction method, the transmission control unit 250 controls the buck-boost converter 210 to output the second DC voltage.

Accordingly, when power is transmitted by the self-resonance method, the peak value of the power output from the inverter 220 is increased through the first DC voltage higher than the input voltage so that power can be transmitted at a relatively long distance, The power efficiency can be improved through the second DC voltage lower than the input voltage.

The first DC voltage is a value of a DC voltage input to the inverter 220 to transmit power in a self resonant manner and the second DC voltage is input to the inverter 220 to transmit power in a self- The magnitudes of the first direct current voltage and the second direct current voltage are not limited as long as they match the values of the direct current voltage.

The transmission control unit 250 may control the transmission power of the wireless power transmission apparatus 20 or the wireless power transmission apparatus 20 by using a wireless power signal formed in the transmission resonator 230 and / ) And the wireless power receiving apparatus 30 and / or the wireless power receiving apparatus 30 can be determined.

However, if the distance between the wireless power transmission apparatus 20 and the wireless power reception apparatus 30 and / or the wireless power reception apparatus 30 can be determined, the configuration and operation of the transmission control unit 250 can be The present invention may include all configurations and operations that are well known to those skilled in the art, such as inputting the type of the wireless power receiving apparatus 30 directly to the transmission control unit 230 by the user.

Therefore, the wireless power transmission apparatus 20 according to an exemplary embodiment of the present invention can perform an inductive coupling based on an electromagnetic induction phenomenon and a resonance coupling based on an electromagnetic resonance phenomenon generated by a wireless power signal of a specific frequency Electromagnetic Resonance Coupling) scheme to transmit power to the wireless power receiving apparatus 30, space efficiency is improved, circuit parts are reduced, and manufacturing cost can be reduced.

FIG. 8 is a block diagram of a wireless power receiving apparatus according to an embodiment of the present invention, and FIG. 9 is a circuit diagram schematically illustrating a configuration of a wireless power receiving apparatus according to an embodiment of the present invention.

8 and 9, a wireless power receiving apparatus 30 according to an exemplary embodiment of the present invention includes a receiving inducer 310, a receiving resonator 320, and a receiving controller 330, Do not exclude.

The wireless power receiving apparatus 30 described in the embodiment of the present invention may be applied to any portable electronic device such as a keyboard, a mouse, an auxiliary output device such as a video or audio output device, a cellular phone, a cellular phone, but is not limited to, a smart phone, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a tablet, or a multimedia device.

The reception resonator 320 receives electric power from the wireless power transmission apparatus 20 in a self-resonant manner.

), 제2 공진 코일(

) 및 수신 스위치(

)를 포함할 수 있다.9, the reception resonator 320 includes a second resonant capacitor

), A second resonant coil (

) And a receiving switch

).

) 및 제2 공진 코일(

)은 수신 공진기(320)가 수신 유도기(310)에 비해 높은 주파수에 적합하도록 임피던스 매칭 설계될 수 있다.At this time, the second resonant capacitor (

And the second resonant coil (

May be designed so that the reception resonator 320 is adapted to a higher frequency than the reception inducing device 310.

) 및 제2 공진 코일(

)은 수신 공진기(320)가 6.78MHz의 주파수에 적합하도록 임피던스 매칭 설계될 수 있다.For example, the second resonant capacitor (

And the second resonant coil (

May be designed to be impedance matching so that the reception resonator 320 is adapted to a frequency of 6.78 MHz.

)는 수신 공진기(320)를 도통 또는 비도통 시킬 수 있으며, 이에 대한 자세한 동작에 대하여는 후술한다.Receive switch (

May turn on or off the reception resonator 320, and detailed operation thereof will be described later.

The receiving inducer 310 is connected to the receiving resonator 320 and receives power from the wireless power transmitting device 20 in a magnetically inductive manner.

) 및 수신 공진기(320)와 병렬 연결된 제2 유도 코일(

)을 포함할 수 있다.9, the receiving inducer 310 includes a second inductive capacitor 320 connected in series with the receiving resonator 320,

And a second induction coil connected in parallel with the reception resonator 320

).

) 및 제2 유도 코일(

)은 수신 유도기(310)가 110kHz 이상 357kHz 이하 주파수에 적합하도록 임피던스 매칭 설계될 수 있다.At this time, the second inductive capacitor (

) And the second induction coil (

May be designed so that the reception inducing unit 310 is adapted to the frequency of 110 kHz or more and 357 kHz or less.

)는 제2 유도 커패시터(

)에 비해 큰 임피던스를 갖도록 설계될 수 있다.Also, the second resonant capacitor (

Is connected to the second inductive capacitor (

The impedance can be designed to have a large impedance as compared with the case of FIG.

), 제1 공진 코일(

), 제2 유도 커패시터(

) 및 제2 유도 코일(

)은 본 발명의 기술분야에서 통상의 기술자가 적용 가능한 수치를 가지는 커패시터 및 코일을 포함한다.However, if the reception resonator 320 can be impedance-matched to be suitable for a high frequency as compared with the reception inducing device 310, the first resonant capacitor

), A first resonance coil (

), A second inductive capacitor (

) And the second induction coil (

) Include capacitors and coils having numerical values applicable to those of ordinary skill in the art.

In the wireless power receiving apparatus 30 according to the embodiment of the present invention, the receiving inducer 310 is positioned inside the receiving resonator 320 like the wireless power transmitting apparatus 20 according to the embodiment of the present invention. At the same time, the reception inducing unit 310 and the reception resonator 320 are connected to each other to improve the space efficiency. However, the present invention is not limited thereto.

The reception controller 330 activates one of the reception inductor 310 and the reception resonator 320 according to the active frequency of the power transmitter.

The reception control unit 330 may control the distance between the wireless power transmission apparatus 20 and the wireless power reception apparatus 30 and / or the distance between the wireless power transmission apparatus 30 and the wireless power transmission apparatus 30 (for example, Resonance mode) and controls the reception resonator 320 and the reception inducing device 310 accordingly.

)를 ON시켜 수신 공진기(320)를 도통시킨다.For example, when the wireless power transmission apparatus 20 is a device that transmits power using a self-resonance method, the reception control unit 330 controls the reception switch

Is turned on to turn on the reception resonator 320.

)이 오픈(open)되는 것과 동일한 현상이 일어나 제2 유도 코일(

)의 특성은 무시되고, 수신 유도기(310)의 제2 유도 커패시터(

)의 임피던스가 수신 공진기(320)의 제2 공진 커패시터(

)의 임피던스보다 작게 설계되어 제2 유도 커패시터(

)의 특성이 무시될 수 있으므로, 수신 공진기(320)만 활성화된다.In this case, since the reception resonator 320 is impedance-matched to be suitable for a high frequency as compared with the reception inducing device 310, the second induction coil of the reception inducing device 310

) Is opened and the second induction coil (

) Is ignored, and the second inductive capacitor of the receiving inducer 310

Is coupled to the second resonant capacitor of the receive resonator 320

) To be smaller than the impedance of the second inductive capacitor < RTI ID = 0.0 >

The characteristic of the reception resonator 320 can be neglected, so that only the reception resonator 320 is activated.

)를 OFF시켜 수신 공진기(320)를 비도통시키고 수신 유도기(310)만을 활성화시킬 수 있다.On the other hand, when the wireless power transmission apparatus 20 is a device that transmits power using the magnetic induction method, the reception control unit 330 controls the reception switch

Off to turn off the reception resonator 320 and activate only the reception inducing unit 310. [

Therefore, the wireless power receiving apparatus 30 according to an embodiment of the present invention can perform the inductive coupling based on the electromagnetic induction phenomenon and the resonant coupling based on the electromagnetic resonance phenomenon generated by the wireless power signal of a specific frequency Electromagnetic Resonance Coupling) scheme to transmit power to the wireless power receiving apparatus 30, space efficiency is improved, circuit parts are reduced, and manufacturing cost can be reduced.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

11, 12: Conventional wireless power transmission device
20: Wireless power transmitter
30: Wireless power receiving device
210: Buck-Boost Converter
220: Inverter
230: transmitting resonator
240:
250: Transmission control section
310:
320: receiving resonator
330:

Claims (9)

A wireless power transmission apparatus for wirelessly transmitting power to a wireless power receiving apparatus,
A converter for converting an input voltage to output a DC voltage;
An inverter connected to the converter for converting the DC voltage output from the converter into AC power;
A transmission resonator connected to the inverter for transmitting the AC power in a self-resonant manner;
A transmission inducer connected to the transmission resonator and configured to transmit the AC power in a magnetic induction manner; And
And a transmission control section for controlling the inverter to generate an active frequency and to activate one of the transmission resonator and the transmission inductor by the active frequency. The method according to claim 1,
The transmission resonator includes:
And a transmission switch for conducting or non-conducting the transmission resonator. 3. The method of claim 2,
The converter includes:
And a buck-boost converter outputting a first DC voltage higher than the input voltage or a second DC voltage lower than the input voltage. The method of claim 3,
The transmission control unit,
The buck-boost converter controlling the buck-boost converter to output the first DC voltage when the wireless power receiving apparatus is a self resonance system,
And controls the buck-boost converter to output the second DC voltage when the wireless power receiving apparatus is of a self-induction type. 3. The method of claim 2,
The transmission control unit,
Controlling the inverter to generate a first active frequency through a direct current voltage output from the converter when the wireless power receiving apparatus is a self resonant system, activating the transmission resonator by turning on the transmission switch,
And the wireless power receiving apparatus is a magnetic induction system. Controls the inverter to generate a second active frequency through a DC voltage output from the converter, and turns off the transmit switch to activate the transmit inducer. 6. The method of claim 5,
The first active frequency is 6.78 MHz,
And the second active frequency is between 110 kHz and 357 kHz. The method according to claim 1,
The transmission resonator includes:
And a first resonant coil connected in series with the first resonant capacitor and the first resonant capacitor. The method according to claim 1,
Wherein the transmission inducing unit comprises:
A first inductive capacitor coupled in series with the transmit resonator, and a second inductive coil in parallel with the transmit resonator. The method according to claim 1,
The transmission resonator includes:
And impedance matching is performed so as to be suitable for a high frequency as compared with the transmission inducing unit.

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