POWER RECEIVING DEVICE, POWER TRANSMISSION DEVICE, AND POWER FEEDING SYSTEM

• US 20130119776A1
• Filed: 11/05/2012
• Published: 05/16/2013
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KAMATA, Koichiro
• Granted Patent: US 9,502,920 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H02J 50/12 of the resonant type
• 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
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A novel power receiving device and a novel power transmission device are provided. Power feeding and communication are performed using a magnetic resonance method. Specifically, in one embodiment of the present invention, power feeding is performed by generating a second high-frequency voltage based on a first high-frequency voltage induced in a resonant coil and communication is performed by modulating amplitude of the first high-frequency voltage induced in the resonant coil. Thus, it is possible to perform communication and power feeding based on data obtained by the communication in pseudo-parallel.

Claims

1. A power receiving device comprising:

a resonant coil in which a first high-frequency voltage be induced by magnetic resonance, the first high-frequency voltage being amplitude-modulated;

a first unit configured to generate a second high-frequency voltage based on the first high-frequency voltage induced in the resonant coil;

a load configured to be supplied with electric power using the second high-frequency voltage generated by the first unit;

a demodulation circuit configured to demodulate a signal from the second high-frequency voltage; and

a second unit configured to modulate amplitude of the first high-frequency voltage induced in the resonant coil,

wherein the power receiving device is configured to respond to the signal using the second unit.

2. The power receiving device according to claim 1,

wherein the first unit comprises a first coil in which the second high-frequency voltage is induced by electromagnetic induction with the resonant coil, and

wherein the second unit comprises a second coil in which a resistance value between its first terminal and its second terminal is changeable.

3. The power receiving device according to claim 1,

wherein the first unit comprises a common coil in which the second high-frequency voltage is induced by electromagnetic induction with the resonant coil, and

wherein the second unit comprises the common coil in which a resistance value between its first terminal and its second terminal is changeable.

4. The power receiving device according to claim 1, further comprising a capacitance electrically connected to the resonant coil.

5. The power receiving device according to claim 1, wherein the load includes at least one of an AC-DC converter, a DC-DC converter, a battery, and a matching circuit.

6. A power feeding system comprising:

the power receiving device according to claim 1; and

a power transmission device.

7. A power receiving device comprising:

a resonant coil in which a first high-frequency voltage be induced by magnetic resonance, the first high-frequency voltage being amplitude-modulated;

a power receiving coil and a communication coil in each of which a second high-frequency voltage is induced by electromagnetic induction with the resonant coil;

a load including a first terminal electrically connected to a first terminal of the power receiving coil and a second terminal electrically connected to a second terminal of the power receiving coil;

a variable resistance unit including a first terminal electrically connected to a first terminal of the communication coil and a second terminal electrically connected to a second terminal of the communication coil;

a demodulation circuit configured to demodulate a demodulated signal from the second high-frequency voltage induced in one of the power receiving coil and the communication coil; and

a power-receiving controller configured to generate a response signal in response to the demodulated signal,

wherein the variable resistance unit is configured to change a resistance value between the first terminal and the second terminal of the communication coil by changing a resistance value of the variable resistance unit based on the response signal.

8. The power receiving device according to claim 7, further comprising a capacitance electrically connected to the resonant coil.

9. The power receiving device according to claim 7, wherein the load includes at least one of an AC-DC converter, a DC-DC converter, a battery, and a matching circuit.

10. A power feeding system comprising:

the power receiving device according to claim 7; and

a power transmission device.

11. A power receiving device comprising:

a resonant coil in which a first high-frequency voltage is induced by magnetic resonance, the first high-frequency voltage being amplitude-modulated;

a power-receiving/communication coil in which a second high-frequency voltage is induced by electromagnetic induction with the resonant coil;

a load including a first terminal being capable of electrically connecting to a first terminal of the power-receiving/communication coil and a second terminal being capable of electrically connecting to a second terminal of the power-receiving/communication coil;

a variable resistance unit including a first terminal being capable of electrically connecting to the first terminal of the power-receiving/communication coil and a second terminal being capable of electrically connecting to the second terminal of the power-receiving/communication coil;

a demodulation circuit configured to demodulate a demodulated signal from the second high-frequency voltage induced in the power-receiving/communication coil;

a controller configured to generate a switching signal for selecting to receive power or to respond and a response signal in response to the demodulated signal; and

a switching unit configured to select whether the power-receiving/communication coil is electrically connected to the load or to the variable resistance unit based on the switching signal,

wherein in a state where the power-receiving/communication coil is electrically connected to the variable resistance unit, a resistance value between the first terminal and the second terminal of the power-receiving/communication coil is changed by the variable resistance unit based on the response signal.

12. The power receiving device according to claim 11, further comprising a capacitance electrically connected to the resonant coil.

13. The power receiving device according to claim 11, wherein the load includes at least one of an AC-DC converter, a DC-DC converter, a battery, and a matching circuit.

14. A power feeding system comprising:

the power receiving device according to claim 11; and

a power transmission device.

15. A power transmission device comprising:

a resonant coil;

a power transmission coil, the power transmission coil configured to induce a first high-frequency voltage in the resonant coil by electromagnetic induction;

a high-frequency power source configured to apply a second high-frequency voltage to the power transmission coil;

a communication coil in which a third high-frequency voltage is induced by electromagnetic induction with the resonant coil;

a variable resistance unit including a first terminal electrically connected to a first terminal of the communication coil and a second terminal electrically connected to a second terminal of the communication coil;

a demodulation circuit electrically connected to one of the power transmission coil and the communication coil; and

a controller configured to control operations of the high-frequency power source and the variable resistance unit.

16. The power transmission device according to claim 15, further comprising a capacitance electrically connected to the resonant coil.

17. A power feeding system comprising:

a power receiving device; and

the power transmission device according to claim 15.

18. A power transmission device comprising:

a resonant coil;

a first unit configured to induce a high-frequency voltage in the resonant coil;

a second unit configured to change amplitude of the high-frequency voltage induced in the resonant coil; and

a third unit configured to detect a reflected wave component from the high-frequency voltage induced in the resonant coil.

19. The power transmission device according to claim 18, further comprising a capacitance electrically connected to the resonant coil.

20. A power feeding system comprising:

a power receiving device; and

the power transmission device according to claim 18.