POWER FEEDING DEVICE AND CONTACTLESS POWER FEEDING SYSTEM PROVIDED WITH POWER FEEDING DEVICE

• US 20120161537A1
• Filed: 12/12/2011
• Published: 06/28/2012
• Est. Priority Date: 12/24/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KAMATA, Koichiro
• Granted Patent: US 8,981,599 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 27/006 with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A power feeding device utilizing an electromagnetic resonance coupling method and a contactless power feeding system can be provided. A coupling coefficient of electromagnetic induction coupling in the power feeding device and/or the inside of a power receiving device is optimized to improve electric power transmission efficiency of a resonance frequency regardless of positions of the power feeding device and the power receiving device. Provided is a power feeding device or a contactless power feeding system in which an S11 parameter which is a reflection component of electric power output from a high-frequency power source of the power feeding device is monitored, and one or both of positions of a transmission coil and a first resonant coil in the power feeding device and positions of a reception coil and a second resonant coil in a power receiving device are changed to adjust a coupling coefficient of electromagnetic induction coupling.

Claims

1. A power feeding device comprising:

a high-frequency power source;

a transmission coil electrically connected to the high-frequency power source;

a resonant circuit comprising a resonant coil;

a detector;

a control circuit electrically connected to the detector; and

a moving unit electrically connected to the control circuit,

wherein the high-frequency power source is configured to output an electric power through the transmission coil,

wherein the resonant coil is configured to perform electromagnetic induction coupling with the transmission coil,

wherein the detector is configured to detect a reflection component of the electric power reflected at the transmission coil,

wherein the control circuit is configured to output a signal in accordance with the reflection component of the electric power, and

wherein the moving unit is configured to control a distance between the transmission coil and the resonant circuit in accordance with the signal.

2. A power feeding device according to claim 1,

wherein the moving unit comprises an electric motor.

3. A power feeding device according to claim 1,

wherein the moving unit is configured to control a position of the transmission coil in accordance with the signal.

4. A power feeding device according to claim 3,

wherein the detector is configured to detect an S11 parameter of the transmission coil, and

wherein the control circuit is configured to output the signal in accordance with the S11 parameter.

5. A power feeding device according to claim 1,

wherein the moving unit is configured to control a position of the resonant circuit in accordance with the signal.

6. A power feeding device according to claim 5,

wherein the detector is configured to detect an S11 parameter of the transmission coil, and

wherein the control circuit is configured to output the signal in accordance with the S11 parameter.

7. A contactless power feeding system comprising the power feeding device according to claim 1.

8. A contactless power feeding system comprising:

a power feeding device; and

a power receiving device,

wherein the power feeding device comprises;

a high-frequency power source;

a transmission coil electrically connected to the high-frequency power source;

a first resonant circuit comprising a first resonant coil;

a detector;

a first control circuit electrically connected to the detector; and

a first transmission/reception circuit electrically connected to the first control circuit,

wherein the power receiving device comprises;

a load;

a reception coil electrically connected to the load;

a second resonant circuit comprising a second resonant coil;

a second transmission/reception circuit;

a second control circuit electrically connected to the second transmission/reception circuit; and

a second moving unit electrically connected to the second control circuit,

wherein the power feeding device is configured to perform electromagnetic resonance coupling with the power receiving device,

wherein the high-frequency power source is configured to output an electric power through the transmission coil,

wherein the first resonant coil is configured to perform electromagnetic induction coupling with the transmission coil,

wherein the detector is configured to detect a reflection component the electric power reflected at the transmission coil,

wherein the first control circuit is configured to output a signal in accordance with the reflection component of the electric power to the first transmission/reception circuit,

wherein the first transmission/reception circuit is configured to transmit the Signal,

wherein the second resonant coil is configured to perform electromagnetic induction coupling with the reception coil,

wherein the second transmission/reception circuit is configured to receive the signal and output the signal to the second control circuit,

wherein the second control circuit is configured to output the signal to the second moving unit,

wherein the second moving unit is configured to control a distance between the reception coil and the second resonant circuit in accordance with the signal, and

wherein the second moving unit is configured to control a position of the second resonant circuit in accordance with the signal.

9. A contactless power feeding system according to claim 8,

wherein the second moving unit comprises an electric motor.

10. A contactless power feeding system according to claim 8,

wherein the power feeding device comprises a first moving unit electrically connected to the first control circuit,

wherein the first moving unit is configured to receive the signal from the first control circuit and control a position of the first resonant circuit in accordance with the signal.

11. A contactless power feeding system according to claim 10,

wherein the first moving unit comprises an electric motor.

12. A contactless power feeding system according to claim 8,

wherein the power feeding device comprises a first moving unit electrically connected to the first control circuit,

wherein the first moving unit is configured to receive the signal from the first control circuit and control a position of the transmission coil in accordance with the signal.

13. A contactless power feeding system according to claim 12,

wherein the first moving unit comprises an electric motor.

14. A contactless power feeding system comprising:

a power feeding device; and

a power receiving device,

wherein the power feeding device comprises;

a high-frequency power source;

a transmission coil electrically connected to the high-frequency power source;

a first resonant circuit comprising a first resonant coil;

a detector;

a first control circuit electrically connected to the detector; and

a first transmission/reception circuit electrically connected to the first control circuit,

wherein the power receiving device comprises;

a load;

a reception coil electrically connected to the load;

a second resonant circuit comprising a second resonant coil;

a second transmission/reception circuit;

a second control circuit electrically connected to the second transmission/reception circuit; and

a second moving unit electrically connected to the second control circuit,

wherein the power feeding device is configured, to perform electromagnetic resonance coupling with the power receiving device,

wherein the high-frequency power source is configured to output an electric power through the transmission coil,

wherein the first resonant coil is configured to perform electromagnetic induction coupling with the transmission coil,

wherein the detector is configured to detect a reflection component of the electric power reflected at the transmission coil,

wherein the first control circuit is configured to output a signal in accordance with the reflection component of the electric power to the first transmission/reception circuit,

wherein the first transmission/reception circuit is configured to transmit the signal,

wherein the second resonant coil is configured to perform electromagnetic induction coupling with the reception coil,

wherein the second transmission/reception circuit is configured to receive the signal and output the signal to the second control circuit,

wherein the second control circuit is configured to output the signal to the second moving unit,

wherein the second moving unit is configured to control a distance between the reception coil and the second resonant circuit in accordance with the signal, and

wherein the second moving unit is configured to control a position of the reception coil in accordance with the signal.

15. A contactless power feeding system according to claim 14,

wherein the second moving unit comprises an electric motor.

16. A contactless power feeding system according to claim 14,

wherein the power feeding device comprises a first moving unit electrically connected to the first control circuit,

wherein the first moving unit is configured to receive the signal from the first control circuit and control a position of the first resonant circuit in accordance with the signal.

17. A contactless power feeding system according to claim 16,

wherein the first moving unit comprises an electric motor.

18. A contactless power feeding system according to claim 14,

wherein the power feeding device comprises a first moving unit electrically connected to the first control circuit,

wherein the first moving unit is configured to receive the signal from the first control circuit and control a position of the transmission coil in accordance with the signal.

19. A contactless power feeding system according to claim 18,

wherein the first moving unit comprises an electric motor.