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

• US 8,359,073 B2
• Filed: 07/09/2009
• Issued: 01/22/2013
• 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: Kamiyama, Masayuki, Onishi, Kota, Shiozaki, Nobutaka, Yoda, Kentaro, Kamijo, Takahiro
• Primary Examiner(s): Aminzay, Shaima Q
• Application Number:
  US12/500,075
• Publication Number:
  US 20100013319A1
• Time in Patent Office: 1,293 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 2038/143 for signals
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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

Abstract

There is provided a power transmission control device included in a power transmission device in a contactless power transmission system that transmits power from the power transmission device to a power receiving device by electromagnetically coupling a primary coil to a secondary coil to supply the power to a load of the power receiving device. The power transmission control device includes a controller controlling the power transmission control device, a host interface communicating with a power transmission-side host, and a register section accessible from the power transmission-side host via the host interface. The controller shifts into a communication mode that executes communication between the power transmission-side host and a power receiving-side host, when the power transmission-side host writes, via the host interface, a communication request command that requests the communication between the hosts in the register section. Then, the controller transmits the communication request command to the power receiving device.

Claims

1. A power transmission control device included in a power transmission device in a contactless power transmission system that transmits power from the power transmission device to a power receiving device by electromagnetically coupling a primary coil to a secondary coil to supply the power to a load of the power receiving device, the power transmission control device comprising:

a controller controlling the power transmission control device;

a host interface communicating with a power transmission-side host; and

a register section accessible from the power transmission-side host via the host interface, the controller shifting into a communication mode that executes communication between the power transmission-side host and a power receiving-side host, when the power transmission-side host writes, via the host interface, a communication request command that requests the communication between the hosts to the register section, as well as the controller transmitting the communication request command to the power receiving device, and wherein the register section including a command register in which a command issued by the power transmission-side host is written and a data register that buffers data; and

the controller transmitting, to the power receiving device, an OUT transmission command that requests data transmission from the power transmission-side host to the power receiving-side host when the OUT transmission command is written in the command register; and

then, the controller transmitting a data transmission command that directs the data transmission and data to the power receiving device when the data transmission command is written in the command register and the data is written in the data register.

2. The power transmission control device according to claim 1, the controller receiving a communication request by the communication request command after completion of an authentication processing between the power transmission device and the power receiving device and a start of normal power transmission.

3. The power transmission control device according to claim 1, the register section including a command register in which a command issued by the power transmission-side host is written and a data register that buffers data;

and the controller transmitting, to the power receiving device, an OUT transmission command that requests data transmission from the power transmission-side host to the power receiving-side host when the OUT transmission command is written in the command register; and

then, the controller transmitting a data transmission command that directs the data transmission and data to the power receiving device when the data transmission command is written in the command register and the data is written in the data register.

4. The power transmission control device according to claim 1, the controller setting at least one of a transmission condition for contactless power transmission and a communication condition between the power transmission device and the power receiving device to a condition for the communication mode that is different from a condition for normal power transmission, when the controller shifts into the communication mode.

5. The power transmission control device according to claim 4, the controller switching a driving frequency or a driving voltage of the primary coil to a driving frequency or a driving voltage of the coil for the communication mode, when shifting into the communication mode.

6. The power transmission control device according to claim 1, the register section including a status register having a bit that allows the power transmission-side host to confirm a power transmission state of contactless power transmission.

7. The power transmission control device according to claim 6, the load including a battery, and the status register having a bit that allows the power transmission-side host to confirm a charge state of the battery.

8. The power transmission control device according to claim 1, the register section including an interruption register having a bit that notifies reception of a command issued by the power receiving-side host to the power transmission-side host upon reception of the command.

9. The power transmission control device according to claim 8, the load including a battery, and the interruption register having a bit that notifies a start of charging of the battery to the power transmission-side host.

10. The power transmission control device according to claim 1, the controller shifting into the communication mode upon reception of an interruption command for a communication request issued by the power receiving-side host.

11. A power transmission device including the power transmission control device of claim 1 and a power transmission section that generates an alternating-current voltage to supply to the primary coil.

12. An electronic apparatus including the power transmission device of claim 11.

13. The power transmission control device according to claim 1, the controller issuing a normal power transmission start command after completion of the communication mode.

14. A power transmission control device included in a power transmission device in a contactless power transmission system that transmits power from the power transmission device to a power receiving device by electromagnetically coupling a primary coil to a secondary coil to supply the power to a load of the power receiving device, the power transmission control device comprising:

a controller controlling the power transmission control device;

a host interface communicating with a power transmission-side host; and

a register section accessible from the power transmission-side host via the host interface, the controller setting at least one of a transmission condition for contactless power transmission and a communication condition between the power transmission device and the power receiving device to a condition for a communication mode that is different from a condition for normal power transmission, when shifting into the communication mode that executes communication between the power transmission-side host and the power receiving-side host, and wherein the register section including a command register in which a command issued by the power transmission-side host is written and a data register that buffers data; and

the controller transmitting, to the power receiving device, an OUT transmission command that requests data transmission from the power transmission-side host to the power receiving-side host when the OUT transmission command is written in the command register; and

then, the controller transmitting a data transmission command that directs the data transmission and data to the power receiving device when the data transmission command is written in the command register and the data is written in the data register.

15. The power transmission control device according to claim 14, the controller issuing a normal power transmission start command after completion of the communication mode.

16. A power receiving control device included in a power receiving device in a contactless power transmission system that transmits power from a power transmission device to the power receiving device by electromagnetically coupling a primary coil to a secondary coil to supply the power to a load of the power receiving device, the power receiving control device comprising:

a controller controlling the power receiving control device;

a host interface communicating with a power receiving-side host; and

a register section accessible from the power receiving-side host via the host interface, the controller shifting into a communication mode that executes communication between a power transmission-side host and the power receiving-side host, when receiving a communication request command that requests the communication between the hosts from the power transmission device, and wherein the register section including a command register in which a command issued by the power receiving-side host is written, and the controller shifting into the communication mode when the power receiving-side host writes an interruption command for a communication request to the power transmission-side host in the command register.

17. The power receiving control device according to claim 16, the controller receiving a communication request by the communication request command after completion of an authentication processing between the power transmission device and the power receiving device and a start of normal power transmission.

18. The power receiving control device according to claim 16, the load including a battery, and the register section including a status register having a bit that allows the power receiving-side host to confirm a charge state of the battery.

19. The power receiving control device according to claim 16, the register section including an interruption register having a bit that notifies reception of a command issued by the power transmission-side host to the power receiving-side host upon reception of the command.

20. A power receiving device including the power receiving control device of claim 16 and a power receiving section that converts an induced voltage of the secondary coil to a direct-current voltage.

21. An electronic apparatus including the power receiving device of claim 20 and a load that receives power from the power receiving device.

22. The power receiving control device according to claim 16, the controller supplying the power to the load when receiving a normal power transmission start command after completion of the communication mode.