Power transmission control device, power reception control device, non-contact power transmission system, power transmission device, power reception device, and electronic instrument

• US 8,111,041 B2
• Filed: 02/15/2008
• Issued: 02/07/2012
• Est. Priority Date: 02/16/2007
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group), Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Original Assignee: Seiko Epson Corporation (Seiko Group), Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Inventors: Onishi, Kota, Yoda, Kentaro, Sogabe, Haruhiko, Kamijo, Takahiro, Suzuki, Kuniharu, Kato, Hiroshi, Suzuki, Katsuya, Yamazaki, Manabu
• Primary Examiner(s): Fantu, Yalkew
• Application Number:
  US12/071,141
• Publication Number:
  US 20080197802A1
• Time in Patent Office: 1,453 Days
• Field of Search: 320/106, 320/108
• US Class Current: 320/108
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• 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 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A power reception device transmits authentication information (e.g., start code, manufacturer ID, product ID, rated power information, and resonance characteristic information) to a power transmission device before starting normal power transmission by a non-contact power transmission system. The power transmission device performs instrument authentication based on the received authentication information, and regulates the maximum transmission power is regulated to conform to a power-reception-device side rated power. The power transmission device then performs normal power transmission.

Claims

1. A non-contact power transmission system comprising a power transmission device and a power reception device, the non-contact power transmission system transmitting power from the power transmission device to the power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device,

the power reception control device including:

a load modulation section that is used to transmit a signal to the power transmission device; and

a power-reception-side control circuit that controls the power reception device;

the power-reception-side control circuit performing control of transmitting authentication information to the power transmission device by load modulation by controlling an operation of the load modulation section during authentication before normal power transmission is started, the authentication information including information that allows the power reception device to control transmission power during the normal power transmission;

a power-transmission-side control circuit of the power transmission device performing an authentication process based the authentication information that is transmitted from the power reception device to determine whether or not power transmission can be performed before the normal power transmission is started, the power-transmission-side control circuit performing control of the normal power transmission when the power-transmission-side control circuit has determined that power transmission can be performed, and controlling maximum transmission power during the normal power transmission to conform to a rated power of a power-reception-device-side based on the information that is included in the authentication information and allows the power transmission device to control transmission power during the normal power transmission.

2. The non-contact power transmission system as defined in claim 1, the power-reception-side control circuit monitoring a state of the load during the normal power transmission, and performing control of transmitting a signal that requests power-saving power transmission when the load does not require the power transmission during the normal power transmission, at the power-saving transmission, the power transmission device transmitting the power smaller than the power at the normal power transmission;

and the power-transmission-side control circuit performing control of changing resonance characteristics of the resonant circuit when receiving the signal that requests the power-saving power transmission from the power reception device, and performing control of the power-saving power transmission at the same frequency as a frequency during power transmission.

3. The non-contact power transmission system as defined in claim 1,

the power transmission device including a resonant circuit that includes the primary coil, and a capacitor that is connected to the primary coil;

and

the power-transmission-side control circuit controlling maximum transmission power during the normal power transmission by changing resonance characteristics of the resonant circuit.

4. A power transmission control device provided in a power transmission device of a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmission device to a power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device, the power transmission control device comprising:

a power-transmission-side control circuit that controls the power transmission device including a resonant circuit that includes the primary coil, and a capacitor that is connected to the primary coil,

the power-transmission-side control circuit performing an authentication process based on authentication information that is transmitted from the power reception device to determine whether or not power transmission can be performed before normal power transmission is started, the power-transmission-side control circuit performing control of the normal power transmission when the power-transmission-side control circuit has determined that power transmission can be performed, and controlling maximum transmission power during the normal power transmission to conform to a rated power of power-reception-device-side by changing resonance characteristics of the resonant circuit based on at least part of the authentication information.

5. The non-contact power transmission system as defined in claim 4,

capacitance of the capacitor being variable;

and

the power-transmission-side control circuit adjusting the capacitance of the capacitor to control the maximum transmission power during the normal power transmission by using a capacitance adjustment signal.

6. The non-contact power transmission system as defined in claim 4,

the primary coil being a coil that has a variable inductance;

and

the power-transmission-side control circuit changing resonance characteristics of the resonant circuit by adjusting the inductance of the primary coil using an inductance adjustment signal to control the maximum transmission power during the normal power transmission.

7. The non-contact power transmission system as defined in claim 4,

the power-transmission-side control circuit changing the resonance characteristics of the resonant circuit when receiving a signal that requests power-saving power transmission from the power reception device, at the power-saving power transmission, the power transmission device transmitting the power smaller than the power at the normal power transmission, and the power-transmission-side control circuit performing control of the power-saving power transmission at the same frequency as a frequency during the normal power transmission.

8. The transmission control device as defined in claim 4,

the authentication information including rated power information of power-reception-device-side, and the power-transmission-side control circuit controlling the maximum transmission power during the normal power transmission based on the rated power information of power-reception-device-side.

9. The power transmission control device as defined in claim 4,

the authentication information including information relating to resonance characteristics of the resonant circuit.

10. The power transmission control device as defined in claim 4,

the authentication information including information that specifies a power-reception-device-side instrument.

11. A power transmission device comprising:

the power transmission control device as defined in claim 4;

a power transmission driver that drives the primary coil;

a drive clock signal generation circuit that generates a drive clock signal; and

a driver control circuit that controls the power transmission driver based on the drive clock signal.

12. An electronic instrument comprising the power transmission device as defined in claim 11.