KR101875974B1 - A wireless power transmission apparatus and method thereof - Google Patents

A wireless power transmission apparatus and method thereof Download PDF

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KR101875974B1
KR101875974B1 KR1020130096289A KR20130096289A KR101875974B1 KR 101875974 B1 KR101875974 B1 KR 101875974B1 KR 1020130096289 A KR1020130096289 A KR 1020130096289A KR 20130096289 A KR20130096289 A KR 20130096289A KR 101875974 B1 KR101875974 B1 KR 101875974B1
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wireless power
power receiving
receiving apparatus
frequency
current value
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KR20130098963A (en
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배수호
이기민
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엘지이노텍 주식회사
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Abstract

A wireless power transmission apparatus according to an embodiment of the present invention includes a plurality of coils, a power supply for generating AC power, a signal generator for applying a detection signal to the plurality of coils at a first frequency, A current measuring unit for measuring a current value according to a variable impedance based on a signal, comparing the measured current value with a threshold value, and determining a position of the wireless power receiving apparatus when the measured current value exceeds a threshold value And a control unit, wherein the impedance is varied by a wireless power receiving apparatus.

Description

[0001] A WIRELESS POWER TRANSMISSION APPARATUS AND METHOD THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission technology, and more particularly, to a wireless power transmission device and a method thereof that efficiently transmit energy using a self resonance phenomenon.

In the 1800s, electric motors and transformers using electromagnetic induction principles began to be used, and then radio waves (radio waves) A method of transmitting electrical energy by radiating an electromagnetic wave such as a wave or a laser has also been tried. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction. Until now, the wireless energy transmission method is magnetic induction, self resonance, and remote transmission technology using short wavelength radio frequency.

The application of the short-range wireless power transmission technology, which has recently become an issue, involves installing a wireless power transmission device in a building, and when a user uses a wireless power reception device in a mobile device such as a mobile phone or a notebook, Typically, charging is continued without connecting cables.

However, in the conventional wireless power transmission technology, since a constant power is always transmitted regardless of the presence or absence of a wireless power receiving apparatus receiving power, there is a problem that power is wasted and harmful to the human body.

A related patent document related thereto is Korean Patent Laid-Open Publication No. 10-2005-0077019.

The present invention provides a wireless power transmission apparatus and method for transmitting energy using a self-resonant phenomenon.

The present invention also provides a wireless power transmission apparatus and method for detecting the position of a wireless power receiving apparatus.

The present invention also provides a wireless power transmission apparatus and method for transmitting energy through a specific power transmission unit corresponding to a position of a wireless power reception apparatus.

According to the present invention, there is provided a method of driving a motor including a plurality of coils, a power supply for generating AC power, a signal generator for applying a detection signal to the plurality of coils at a first frequency, And a controller for comparing the measured current value with a threshold value and determining a position of the wireless power receiving apparatus when the measured current value exceeds a threshold value, A self-resonant wireless power transmission apparatus which is variable by a power receiving apparatus.

According to another aspect of the present invention, there is provided a method of controlling an impedance of a coil, the method comprising: applying a signal to a plurality of coils at a first frequency; measuring a current value based on an impedance variable in the plurality of coils; And determining a position of the wireless power receiving apparatus when the measured current value exceeds a threshold value, wherein the impedance is varied by the wireless power receiving apparatus, and the impedance is detected Wherein the plurality of coils provide power to the wireless power receiving device at a second frequency.

According to the embodiment of the present invention, the wireless power transmission apparatus can improve energy transfer efficiency to the wireless power reception apparatus by transmitting energy through the power transmission unit corresponding to the position of the wireless power reception apparatus.

In addition, the wireless power transmission apparatus can reduce energy waste and reduce the occurrence of a harmful magnetic field to the human body by concentrating the energy transmission through the specific power transmission unit.

Meanwhile, various other effects will be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is a diagram illustrating a wireless power transmission system according to an embodiment of the present invention;
2 is an equivalent circuit diagram of a transmission coil part according to an embodiment of the present invention;
3 is an equivalent circuit diagram of a power source and a transmission unit according to an embodiment of the present invention;
4 is an equivalent circuit diagram of a receiving resonance coil part, a receiving coil part, a rectifying circuit, and a load according to an embodiment of the present invention;
5 is a configuration diagram of a wireless power transmission apparatus according to an embodiment of the present invention;

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 shows a wireless power transmission system according to an embodiment of the present invention.

1, a wireless power transmission system includes a power source 10, a power transmitter 20, a power receiver 30, a rectifier circuit 40, and a load 50.

The power generated by the power source 10 is transmitted to the power transmitter 20 and is transmitted to the power receiver 30 that resonates with the power transmitter 20 by the self resonance phenomenon. The power transmitted to the power receiving unit 30 is transmitted to the load 50 via the rectifying circuit 40. At this time, the load 50 may be any device requiring a rechargeable battery or other electric power.

More specifically, the power source 10 is an alternating current power source providing alternating current power having a predetermined frequency.

The power transmitting section 20 is composed of a transmitting coil section 21 and a transmitting resonance coil section 22. The transmitting coil part 21 is connected to the power source 10, and alternating current flows. When an alternating current flows in the transmitting coil part 21, an alternating current is also induced in the transmitting resonating coil part 22 physically spaced by the electromagnetic induction. The power transmitted to the transmitting resonance coil section 22 is transmitted to the power receiving section 30, which forms a resonant circuit with the power transmitting section 20, by self resonance.

Power transmission by self-resonance is a phenomenon in which power is transmitted between two LC circuits whose impedances are matched. As a result, power can be transmitted at a higher efficiency than a power transmission by electromagnetic induction.

The power receiving unit 30 is composed of a receiving resonance coil unit 31 and a receiving coil unit 32. The power transmitted by the transmission resonance coil section 22 is received by the reception resonance coil section 31 and the AC current flows to the reception resonance coil section 31. [ The power transmitted to the reception resonance coil part 31 is transmitted to the reception coil part 32 by electromagnetic induction. The power delivered to the receiving coil part 32 is rectified through the rectifying circuit 40 and transferred to the load 50. [

2 is an equivalent circuit of the transmission coil section 21 according to an embodiment of the present invention. As shown in FIG. 2, the transmission coil section 21 may be constituted by an inductor L1 and a capacitor C1, thereby constituting a circuit having an appropriate inductance and capacitance value.

The capacitor C1 may be a fixed capacitor or a variable capacitor. When the capacitor C1 is a variable capacitor, the power transmitter 20 may adjust impedance of the variable capacitor to perform impedance matching. On the other hand, the equivalent circuit of the transmission resonance coil section 22, the reception resonance coil section 31, and the reception coil section 32 may be the same as that shown in FIG.

3 is an equivalent circuit of the power source 10 and the power transmitter 20 according to an embodiment of the present invention. 3, the transmission coil part 21 and the transmission resonance coil part 22 may be composed of inductors L1 and L2 and capacitors C1 and C2 having predetermined inductance and capacitance values, respectively .

In particular, the capacitor C2 of the transmission resonance coil part 22 may be a variable capacitor, and the power transmitter 20 may adjust the resonance frequency value for self-resonance by adjusting the variable capacitor.

4 is an equivalent circuit of the receiving resonance coil part 31, the receiving coil part 32, the rectifying circuit 40 and the load 50 according to the embodiment of the present invention. 4, the reception resonance coil section 31 and the reception coil section 32 may be composed of inductors L3 and L4 and capacitors C3 and C4 having predetermined inductance and capacitance values, respectively .

The rectifying circuit 40 may be composed of a diode D1 and a smoothing capacitor C5, and converts AC power into DC power and outputs it. The load 50 is indicated by a DC power supply of 1.3 V, but may be any rechargeable battery or device requiring DC power.

In the following, embodiments of the present invention will be described with reference to a wireless power transmission apparatus for transmitting energy through a power transmission unit corresponding to a position of a wireless power reception apparatus, and a method thereof.

5 shows a configuration of a wireless power transmission apparatus according to an embodiment of the present invention.

5, the wireless power transmission apparatus includes a power supply unit 11, a signal generation unit 12, a current measurement unit 13, a switch unit 14, a control unit 15, and a plurality of power transmission units 20 . Here, the plurality of power transmission units 20 are integrally formed to constitute a transmission pad 25.

In FIG. 5, the remaining components except for the power transmitter 20 may be included in the power source 10 of FIG.

The transmission pad 25 includes a plurality of power transmission units 20 arranged in a regular order. Here, the transmission pad 25 may have a rectangular shape, but is not limited thereto.

When the wireless power receiving apparatus 60 is positioned on the transmitting pad 25, the wireless power transmitting apparatus transmits energy to the wireless power receiving apparatus 60 through the specific power transmitting unit in the transmitting pad 25. [

The power supply unit 11 generates AC power of a specific frequency for energy transmission and provides it to the switch unit 14. [

The signal generating unit 12 generates a measurement signal for detecting the position of the wireless power receiving apparatus and provides it to the switch unit 14. At this time, the measurement signal may be a current signal having a self-resonant frequency.

The switch unit 14 switches the measurement signal provided from the signal generator 12 to sequentially provide the measurement signals to the plurality of power transmitters 20. That is, under the control of the control unit 15, the switch unit 14 sequentially switches signals from the first power transmission unit 20_1 to the twelfth power transmission unit 20_12 to detect the position of the wireless power reception device .

The switch unit 14 switches the power generated by the power supply unit 11 to provide power to the specific power transmission unit 20 among the plurality of power transmission units 20. That is, the switch unit 14 switches the power to be supplied to the power transmitting unit corresponding to the position of the wireless power receiving apparatus, and switches the power to the remaining power transmitting unit so that power is not supplied. Here, the power transmission unit corresponding to the position of the wireless power reception device means a power transmission unit disposed below the area of the transmission pad where the wireless power reception device is located.

The plurality of power transmission units 20 may be arranged in a lattice or matrix form within the transmission pad 25. That is, the plurality of power transmission units 20 may be formed to divide the area of the transmission pad 25 into a plurality of equal areas.

In addition, the plurality of power transmission units 20 may be configured to have the same size and shape, but are not limited thereto. Meanwhile, in the present embodiment, the plurality of power transmitters 20 illustrate a total of twelve power transmitters 20_1 to 20_12 arranged in a lattice pattern, but the present invention is not limited thereto.

Each of the plurality of power transmission sections 20 includes a transmission coil section 21 and a transmission resonance coil section 22, respectively.

The transmitting coil part 21 is connected to the switch part 14, and an alternating current flows therein to generate a magnetic field. Then, the transmission coil part 21 transmits a magnetic field to the transmission resonance coil part 22 physically spaced by electromagnetic induction.

When the transmission resonance coil section 22 receives a magnetic field from the transmission coil section 21, an alternating current is induced in the transmission coil section 21. Then, the transmission resonance coil section 22 provides the energy stored therein to the wireless power receiving apparatus 60 using the self-resonance phenomenon. At this time, the self-resonance frequency of the transmission resonance coil part 22 and the self-resonance frequency of the reception resonance coil part (not shown) must coincide with each other for wireless power transmission by self-resonance.

The transmission resonance coil part 22 includes a capacitor 22a, and the capacitor 22a may be a fixed capacitor or a variable capacitor.

When the capacitor 22a of the transmission resonance coil part 22 is a variable capacitor, the controller 15 can adjust the resonance frequency for self-resonance through the capacitor 22a of the transmission resonance coil part 22.

For example, assuming that the wireless power receiving apparatus has a fixed self-resonant frequency, the wireless power transmitting apparatus may be configured such that the variable capacitor 22a of the transmitting resonant coil section 22 is set to have the same resonant frequency as the resonant frequency of the wireless power receiving apparatus . At this time, the controller 18 needs to store information on the resonance frequency of the wireless power receiving apparatus in advance.

On the other hand, when the capacitor 22a of the transmission resonance coil part 22 is a fixed capacitor, the capacitor can be set in advance so that the resonance frequency of the transmission resonance coil part 22 is equal to the resonance frequency of the wireless power reception device .

The control unit 15 can control to operate only the specific power transmission unit corresponding to the position of the wireless power receiving device existing on the transmission pad 25. [

5, when the wireless power receiving apparatus 60 is connected to the fifth power transmitting unit 20_5, the sixth power transmitting unit 20_6, the ninth power transmitting unit 20_9 and the tenth power transmitting unit 20_10 The control unit 15 controls only the fifth power transmission unit 20_5, the sixth power transmission unit 20_6, the ninth power transmission unit 20_9 and the tenth power transmission unit 20_10 through the switch unit 14 .

The control unit 15 may control the switch unit 14 to operate only the sixth power transmission unit 20_6 that overlaps the wireless power reception device 60 the most.

Through this process, the wireless power transmission apparatus can concentrate the energy transmission to the wireless power reception apparatus through the power transmission unit 20 corresponding to the position of the wireless power reception apparatus.

The current measuring unit 13 measures the internal current of the wireless power transmitting apparatus and provides the measurement result to the control unit 15. [ Then, the control unit 15 detects the position of the wireless power receiving apparatus based on the current measurement value supplied from the current measuring unit 13.

At this time, the principle that the controller 15 detects the position of the wireless power receiving apparatus through the current measurement value is as follows.

Each power transmission section 20, that is, the transmission resonance coil section 22 has its own resonant frequency f 1 by the inductor and the capacitor component connected in parallel. Each of the power transmission units has the same self-resonant frequency f 1 .

When a measurement signal having such a self-resonant frequency is applied to a specific power transmission unit, the current value measured in the wireless power transmission apparatus is minimized. This is because the inductor and the capacitor of the power transmission unit are seen to be open at the resonance frequency f 1 , and the impedance is maximized.

However, when the wireless power receiving apparatus is brought close to the power transmitting unit, the inductor (L1) component of the power transmitting unit and the inductor (L2) component of the receiving apparatus are coupled to each other to generate mutual inductance components. In this case, the mutual inductance component is defined by Equation (1).

Figure 112013073654283-pat00001

Where k is the coupling coefficient, L 1 is the magnetic inductance of the power transmitter, and L 2 is the magnetic inductance of the receiver.

The mutual inductance component M generated between the power transmitting unit and the receiving device changes the self resonant frequency f 1 of the power transmitting unit or the receiving unit and the changed resonant frequency is referred to as mutual resonant frequency f 2 .

At this mutual resonance frequency f 2 , the inductors and capacitors of the power transmitter do not have a maximum impedance value. Therefore, when the receiving apparatus applies a measurement signal having its own resonance frequency (f 1 ) to a nearby power transmission unit, the current value measured in the wireless power transmission apparatus increases.

And, as the receiving apparatus gets closer to the power transmitting unit, the mutual resonance frequency f 2 or the current value measured in the radio power transmitting apparatus gradually increases. Through the change in the mutual resonance frequency f 2 or the current value, the controller 15 can determine whether the wireless power receiving apparatus is close to the specific power transmitting unit.

On the other hand, the control unit 15 may previously store the mutual resonance frequency values according to the current values in the form of a look-up table. Through the look-up table, the control unit 15 can grasp the mutual resonance frequency f 2 based on the current value detected by the current measuring unit 13.

The controller 15 sequentially monitors the plurality of power transmission units 20 and monitors information on the current value provided by the current measurement unit 13. [ The control unit 15 detects in which region on the transmission pad the wireless power receiving apparatus is located based on the information on the current value.

For example, the control unit 15 applies the measurement signal having the self-resonant frequency f1 to the first power transmission unit 20_1 through the control of the switch unit 14. [ Then, when receiving information on the current value from the current measuring unit 13, the controller 15 determines whether a wireless power receiving apparatus exists on a region of the transmitting pad where the first power transmitting unit 20_1 is located .

The controller 15 sequentially performs this process for the remaining power transmitters and recognizes whether or not the wireless power receiver is present on the area of the transmission pad where the corresponding power transmitter is located.

In addition, the control unit 15 needs to set a threshold value for determining in which area of the plurality of areas corresponding to the plurality of power transmitting units 20 the wireless power receiving apparatus is located. This is because, when the wireless power receiving apparatus 60 is placed over a plurality of regions, a change in the amount of current is detected in all of the plurality of power transmission sections that span the region.

Through the setting of the threshold value, the controller 15 can determine a transmission coil part located in the area which overlaps most with the wireless power reception device. Therefore, the control unit 15 can determine that the wireless power receiving apparatus is located on the power transmitting unit only when the current value received from the current measuring unit 13 exceeds a preset threshold value.

When the detection of the position of the wireless power receiving apparatus is completed, the controller 15 transmits energy through the power transmitting unit corresponding to the position of the wireless power receiving apparatus. That is, the control unit 15 provides the AC power generated by the power supply unit 11 to the corresponding power transmission unit through the control of the switch unit 14.

The wireless power transmission apparatus generates AC power having the mutual resonance frequency f 2 through the power supply unit 11 and transmits energy through the power transmission unit corresponding to the position of the wireless power reception apparatus. That is, the actual energy transmission is not the self resonant frequency f 1 but the mutual resonant frequency f 2 . At this time, the control unit 15 may control the power supply unit 11 to generate AC power having a mutual resonance frequency f 2 .

Meanwhile, in the present embodiment, the wireless power transmission apparatus exemplifies a method of detecting the position of the wireless power receiving apparatus through a change in the amount of current, but it is not limited thereto. That is, the wireless power transmission apparatus may use a detection method using a pressure sensor on a transmission pad instead of a detection method using a change in amount of current.

As described above, the wireless power transmission apparatus according to the embodiment of the present invention transmits energy through the specific power transmission unit corresponding to the position of the wireless power reception apparatus existing on the transmission pad, The transmission efficiency can be improved.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

10: Power source 11: Power supply
12: Signal generating part 13: Current measuring part
14: Switch part 15: Control part
20: power transmission unit 21:
22: transmitting resonance coil part 30: power receiving part
31: receiving resonance coil part 32: receiving coil part
40: rectifier circuit 50: load
60: Wireless power receiving device

Claims (16)

  1. A wireless power transmission apparatus for wirelessly transmitting power to a wireless power receiving apparatus,
    A plurality of coils;
    A variable capacitor connected in parallel to each of the plurality of coils;
    A signal generator for applying a wireless power receiver detection signal to the plurality of coils at a first frequency;
    A current measuring unit for measuring a current value of each coil according to a variable impedance based on a detection signal applied to the plurality of coils;
    Comparing the measured current value of each coil with a threshold current value, identifying at least one coil among the current values of the measured coils exceeding the threshold current value, and determining at least one coil corresponding to the identified at least one coil A controller for sensing a position of the wireless power receiving apparatus as a position of the wireless power receiving apparatus;
    And a power supply unit for applying power to a coil corresponding to a position of the wireless power receiving apparatus,
    The impedance is varied by the wireless power receiving device,
    Wherein the variable capacitor varies a frequency of a coil corresponding to a position of the wireless power receiving apparatus to a second frequency,
    A coil corresponding to a position of the wireless power receiving apparatus transmits power to the wireless power receiving apparatus at the variable second frequency,
    Wherein the threshold current value is a predetermined minimum current value for sensing the wireless power receiving apparatus.
  2. delete
  3. The method according to claim 1,
    Wherein the first frequency and the second frequency are different.
  4. delete
  5. delete
  6. delete
  7. delete
  8. The method according to claim 1,
    And a pad for placing a plurality of coils.
  9. 9. The method of claim 8,
    Wherein the plurality of coils are disposed below the pads.
  10. 10. The method of claim 9,
    Wherein the plurality of coils are arranged in a lattice or matrix form on the pad.
  11. A power transmission method of a wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus,
    Applying a wireless power receiver detection signal at a first frequency to a plurality of coils;
    Measuring a current value of each of the coils based on an impedance variable;
    Comparing the measured current value of each coil with a threshold current value;
    Detecting at least one coil having a critical current value among the measured current values of the coils as a result of the comparison;
    Determining a location of the wireless power receiving device at a location corresponding to the sensed at least one coil;
    Varying a frequency of at least one coil corresponding to a position of the wireless power receiving apparatus to a second frequency that is a wireless power receiving frequency of the wireless power receiving apparatus by using a variable capacitor;
    And supplying power to the wireless power receiving apparatus at the variable second frequency,
    Wherein the impedance is varied by the wireless power receiving apparatus,
    A detection signal is applied to the plurality of coils according to a switching operation of the switch, a power is supplied to a coil corresponding to a position of the wireless power receiving apparatus,
    Wherein the threshold current value is a preset minimum current value for sensing the wireless power receiving apparatus.
  12. 12. The method of claim 11,
    Wherein the first frequency and the second frequency are different.
  13. delete
  14. delete
  15. delete
  16. delete
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KR102032619B1 (en) * 2017-11-29 2019-10-15 연세대학교 산학협력단 Apparatus for Transmitting Wireless Power for multiple simultaneous charging and Appratus for Receiving Wireless Power

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