Power transmission control device, power transmission device, power receiving control device, power receiving device, and electronic apparatus

• US 8,369,905 B2
• Filed: 07/15/2009
• Issued: 02/05/2013
• Est. Priority Date: 07/16/2008
• Status: Active Grant

• Current Assignee: 138 East LCD Advancements Limited (Vector Capital Corporation)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Sogabe, Haruhiko, Kondo, Yoichiro, Onishi, Kota, Kamiyama, Masayuki, Shiozaki, Nobutaka, Kamijo, Takahiro
• Primary Examiner(s): Aminzay, Shaima Q
• Application Number:
  US12/503,475
• Publication Number:
  US 20100013322A1
• Time in Patent Office: 1,301 Days
• Field of Search: 455/573, 455/522, 455/69, 455/403, 455/24, 455/550.1, 455/556.1, 455/572, 455/574, 320/108, 320/109, 320/115, 323/355, 379/443, 370/104, 370/140, 370/150
• US Class Current: 455/573
• CPC Class Codes: H01F 2038/146 in combination with capacitive coupling
• 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

Abstract

A power transmission control device provided in a power transmission device included in a contactless power transmission system in which power is transmitted from the power transmission device to a power receiving device by electromagnetically coupling a primary coil and a secondary coil and the power is supplied to a load of the power receiving device includes a controller controlling the power transmission control device. The controller includes a communication condition setting section setting, by exchanging information with the power receiving device, a communication condition that is at least one of a communication method between the power transmission device and the power receiving device and a communication parameter, and a communication processing section performing a communication processing between the power transmission device and the power receiving device by using the set communication condition.

Claims

1. A power transmission control device provided in a power transmission device included in a contactless power transmission system in which power is transmitted from the power transmission device to a power receiving device by electromagnetically coupling a primary coil and a secondary coil and the power is supplied to a load of the power receiving device, the power transmission control device comprising:

a controller that controls the power transmission control device, the controller including;

a communication condition setting section that sets a communication condition by exchanging information with the power receiving device, the communication condition being at least one of a communication method between the power transmission device and the power receiving device and a communication parameter;

a communication processing section that communicates between the power transmission device and the power receiving device by using the set communication condition; and

a negotiation processing section that negotiates contactless power transmission, the negotiation section performing a collation processing on system information showing standard information, coil information, and a load state detection method with respect to the power receiving device.

2. The power transmission control device according to claim 1, the communication processing section performing, by using the communication condition, a communication processing after a start of normal power transmission between the power transmission device and the power receiving device.

3. The power transmission control device according to claim 2, the communication processing section performing the communication processing between the power transmission device and the power receiving device by using an initial communication condition before the start of the normal power transmission, and the communication condition setting section exchanging information with the power receiving device in a communication processing before the start of the normal power transmission using the initial communication condition so as to set the communication condition used in the communication processing after the start of the normal power transmission.

4. The power transmission control device according to claim 1, in a case where a communication from the power transmission device to the power receiving device is performed by a frequency modulation, the communication condition setting section setting a frequency in the frequency modulation as the communication parameter of the communication condition.

5. The power transmission control device according to claim 1, in a case where a communication from the power receiving device to the power transmission device is performed by a load modulation, the communication condition setting section setting a threshold in the load modulation as the communication parameter of the communication condition.

6. The power transmission control device according to claim 1, in a case where a periodic authentication is performed from the power receiving device to the power transmission device after the start of the normal power transmission, the communication condition setting section setting a threshold for the periodic authentication as the communication parameter of the communication condition.

7. The power transmission control device according to claim 1, the communication condition setting section receiving communication condition information from the power receiving device so as to set the communication condition.

8. The power transmission control device according to claim 7, the controller including:

a negotiation processing section that negotiates contactless power transmission; and

a setup processing section that setups the contactless power transmission based on a result of the negotiation processing, and the communication condition setting section receiving the communication condition information from the power receiving device by the setup processing.

9. A power transmission device, comprising:

the power transmission control device according to claim 1; and

a power transmission section generating an alternating-current voltage so as to supply the voltage to the primary coil.

10. An electronic apparatus, comprising the power transmission device according to claim 9.

11. The power transmission control device according to claim 1, the information exchanged includes (1) a first negotiation frame containing threshold information generated by and transmitted from the power receiving device in response to a power supply voltage supplied by the power transmission device to the power receiving device, (2) a second negotiation frame containing system information generated by and transmitted from the power transmission device in response to the first negotiation frame from the power receiving device, and (3) a setup frame containing communication condition generated by and transmitted from the power receiving device in response to the second negotiation frame from the power transmission device.

12. A power receiving control device provided in a power receiving device included in a contactless power transmission system in which power is transmitted from a power transmission device to the power receiving device by electromagnetically coupling a primary coil and a secondary coil and the power is supplied to a load of the power receiving device, the power transmission device including a negotiation processing section that negotiates contactless power transmission, the negotiation section performing a collation process on system information showing standard information, coil information, and a load state detection method with respect to the power receiving device, the power receiving control device comprising:

a controller that controls the power receiving control device, the controller including;

a communication condition setting section that sets a communication condition by exchanging information with the power transmission device, the communication condition being at least one of a communication method between the power transmission device and the power receiving device and a communication parameter; and

a communication processing section that communicates between the power transmission device and the power receiving device by using the set communication condition.

13. The power receiving control device according to claim 12, the communication processing section performing, by using the communication condition, a communication processing after a start of normal power transmission between the power transmission device and the power receiving device.

14. The power receiving control device according to claim 12, the communication processing section performing the communication processing between the power transmission device and the power receiving device by using an initial communication condition before the start of the normal power transmission, and the communication condition setting section exchanging information with the power transmission device in a communication processing before the start of the normal power transmission so as to set the communication condition used in the communication processing after the start of the normal power transmission.

15. The power receiving control device according to claim 12, the communication condition setting section transmitting communication condition information to the power transmission device so as to set the communication condition.

16. The power receiving control device according to claim 15, the controller including:

a negotiation processing section performing a negotiation processing of contactless power transmission; and

a setup processing section performing a setup processing of the contactless power transmission based on a result of the negotiation processing, and the communication condition setting section transmitting the communication condition information to the power transmission device by the setup processing.

17. A power receiving device, comprising:

the power receiving control device according to claim 12; and

a power receiving section converting an induced voltage of the secondary coil into a direct-current voltage.

18. An electronic apparatus, comprising:

the power receiving device according to claim 17; and

a load to which power is supplied by the power receiving device.

19. The power receiving control device according to claim 12, the information exchanged includes (1) a first negotiation frame containing threshold information generated by and transmitted from the power receiving device in response to a power supply voltage supplied by the power transmission device to the power receiving device, (2) a second negotiation frame containing system information generated by and transmitted from the power transmission device in response to the first negotiation frame from the power receiving device, and (3) a setup frame containing communication condition generated by and transmitted from the power receiving device in response to the second negotiation frame from the power transmission device.