Power receiving device and power feeding system

• US 9,641,223 B2
• Filed: 03/14/2013
• Issued: 05/02/2017
• Est. Priority Date: 03/26/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Miwa, Misako, Kamata, Koichiro, Maeda, Shuhei
• Primary Examiner(s): BARNIE, REXFORD N
• Assistant Examiner(s): Tran, Thai
• Application Number:
  US13/804,883
• Publication Number:
  US 20130249309A1
• Time in Patent Office: 1,510 Days
• Field of Search: 307104, 320108
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• 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: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• 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 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A power receiving device and a power feeding system which are capable of performing communication and power feeding at the same time are provided. Further, a power receiving device and a power feeding system which are capable of stably performing communication during power feeding are provided. One embodiment of the present invention relates to a power receiving device which includes an antenna for communication and power feeding that receives AC power, a rectifier circuit that rectifies the received AC power including the modulation signal into DC power, a smoothing circuit that smoothes the resulting DC power, a power storage device that stores the smoothed DC power, a communication control unit that analyzes the modulation signal included in the AC power, and a transformer that is positioned between the antenna and the rectifier circuit and changes a reference potential of the AC power, and a power feeding device.

Claims

1. A power receiving device comprising:

an antenna configured to receive a first AC power and a modulation signal;

a rectifier circuit configured to rectify the first AC power into DC power;

a power storage device configured to store the DC power;

a communication control unit to which a second AC power including the modulation signal is input; and

a transformer between the antenna and the rectifier circuit,

wherein a first terminal of the rectifier circuit and a third terminal of the transformer are electrically connected to a first node,

wherein a second terminal of the rectifier circuit and a fourth terminal of the transformer are electrically connected to a second node,

wherein a third terminal of the rectifier circuit and one electrode of the power storage device are electrically connected to a third node,

wherein a maximum potential of the first AC power is a potential of the first node,

wherein a minimum potential of the first AC power is a potential of the second node,

wherein a potential of the DC power stored in the power storage device is a potential of the third node,

wherein a voltage amplitude of the first AC power is the same as a voltage amplitude of the second AC power, and

wherein an intermediate potential of the first AC power is different from an intermediate potential of the second AC power.

2. The power receiving device according to claim 1,

wherein the communication control unit comprises:

a control circuit configured to analyze the modulation signal;

an interface portion configured to convert the modulation signal into a signal which can be analyzed by the control circuit; and

a voltage generator configured to generate a reference potential of the control circuit and a reference potential of the interface portion, from the potential of the DC power and a ground potential.

3. The power receiving device according to claim 1,

wherein the rectifier circuit comprises:

a first diode;

a second diode;

a third diode; and

a fourth diode,

wherein one terminal of the first diode is electrically connected to one terminal of the second diode,

wherein the other terminal of the second diode is electrically connected to one terminal of the third diode,

wherein the other terminal of the third diode is electrically connected to one terminal of the fourth diode, and

wherein the other terminal of the fourth diode is electrically connected to the other terminal of the first diode.

4. The power receiving device according to claim 1,

wherein the antenna comprises:

a first coil;

a second coil; and

a capacitor,

wherein one terminal of the first coil is electrically connected to one terminal of the capacitor, and

wherein the other terminal of the first coil is electrically connected to the other terminal of the capacitor.

5. The power receiving device according to claim 1,

wherein one terminal of the antenna and a first terminal of the transformer are electrically connected to a fourth node,

wherein the other terminal of the antenna and a second terminal of the transformer are electrically connected to a fifth node,

wherein a maximum potential of the second AC power is a potential of the fourth node, and

wherein a minimum potential of the second AC power is a potential of the fifth node.

6. An electronic appliance comprising the power receiving device according to claim 1.

7. The power receiving device according to claim 1,

wherein the communication control unit is configured to analyze the modulation signal and is driven using a potential of the DC power and a ground potential, and

wherein the transformer is configured to change a reference potential of the second AC power.

8. The power receiving device according to claim 1, further comprising a smoothing circuit configured to smooth the DC power,

wherein a first terminal of the smoothing circuit is electrically connected to the third node, and

wherein a second terminal of the smoothing circuit is grounded.

9. The power receiving device according to claim 1, wherein a fourth terminal of the rectifier circuit and the other electrode of the power storage device are grounded.

10. A power feeding system comprising:

a power transmitting device comprising;

a first control circuit configured to generate a modulation signal;

a modulation circuit configured to convert the modulation signal into a signal which can be wirelessly communicated; and

a first antenna configured to send a first AC power and the modulation signal; and

a power receiving device comprising;

a second antenna configured to receive the first AC power and the modulation signal;

a rectifier circuit configured to rectify the first AC power into DC power;

a power storage device configured to store the DC power;

a communication control unit to which a second AC power including the modulation signal is input; and

a transformer between the second antenna and the rectifier circuit,

wherein a first terminal of the rectifier circuit and a third terminal of the transformer are electrically connected to a first node,

wherein a second terminal of the rectifier circuit and a fourth terminal of the transformer are electrically connected to a second node,

wherein a third terminal of the rectifier circuit and one electrode of the power storage device are electrically connected to a third node,

wherein a maximum potential of the first AC power is a potential of the first node,

wherein a minimum potential of the first AC power is a potential of the second node,

wherein a potential of the DC power stored in the power storage device is a potential of the third node,

wherein a voltage amplitude of the first AC power is the same as a voltage amplitude of the second AC power, and

wherein an intermediate potential of the first AC power is different from an intermediate potential of the second AC power.

11. The power feeding system according to claim 10,

wherein the communication control unit comprises:

a second control circuit configured to analyze the modulation signal;

an interface portion configured to convert the modulation signal into a signal which can be analyzed by the second control circuit; and

a voltage generator configured to generate a reference potential of the second control circuit and a reference potential of the interface portion, from the potential of the DC power and a ground potential.

12. The power feeding system according to claim 10,

wherein the rectifier circuit comprises:

a first diode;

a second diode;

a third diode; and

a fourth diode,

wherein one terminal of the first diode is electrically connected to one terminal of the second diode,

wherein the other terminal of the second diode is electrically connected to one terminal of the third diode,

wherein the other terminal of the third diode is electrically connected to one terminal of the fourth diode, and

wherein the other terminal of the fourth diode is electrically connected to the other terminal of the first diode.

13. The power feeding system according to claim 10,

wherein the second antenna comprises:

a first coil;

a second coil; and

a capacitor,

wherein one terminal of the first coil is electrically connected to one terminal of the capacitor, and

wherein the other terminal of the first coil is electrically connected to the other terminal of the capacitor.

14. The power feeding system according to claim 10,

wherein one terminal of the second antenna and a first terminal of the transformer are electrically connected to a fourth node,

wherein the other terminal of the second antenna and a second terminal of the transformer are electrically connected to a fifth node,

wherein a maximum potential of the second AC power is a potential of the fourth node, and

wherein a minimum potential of the second AC power is a potential of the fifth node.

15. The power feeding system according to claim 10,

wherein the power transmitting device further comprises:

a demodulation circuit; and

a coupler being electrically connected to the demodulation circuit.

16. An electronic appliance comprising the power receiving device according to claim 10.

17. The power feeding system according to claim 10,

wherein the communication control unit is configured to analyze the modulation signal and is driven using a potential of the DC power and a ground potential, and

wherein the transformer is configured to change a reference potential of the second AC power.

18. The power feeding system according to claim 10, further comprising a smoothing circuit configured to smooth the DC power,

wherein a first terminal of the smoothing circuit is electrically connected to the third node, and

wherein a second terminal of the smoothing circuit is grounded.

19. The power feeding system according to claim 10, wherein a fourth terminal of the rectifier circuit and the other electrode of the power storage device are grounded.