POWER RECEPTION CONTROL DEVICE, POWER RECEPTION DEVICE, NON-CONTACT POWER TRANSMISSION SYSTEM, CHARGE CONTROL DEVICE, BATTERY DEVICE, AND ELECTRONIC INSTRUMENT

• US 20090021219A1
• Filed: 07/16/2008
• Published: 01/22/2009
• Est. Priority Date: 07/17/2007
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: KAMIJO, Takahiro, YODA, Kentaro, KAMIYAMA, Masayuki, ONISHI, Kota, SHIOZAKI, Nobutaka
• Granted Patent: US 8,344,688 B2
• Time in Patent Office: Days
• US Class Current: 320/137
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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: 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

Abstract

A power reception control device provided in a power reception device of a non-contact power transmission system includes a power-reception-side control circuit that controls an operation of the power reception device, and a power supply control signal output terminal that supplies a power supply control signal to a charge control device, the power supply control signal controlling power supply to a battery. The power-reception-side control circuit controls a timing at which the power supply control signal (ICUTX) is output from the power supply control signal output terminal. The operation of the charge control device is compulsorily controlled using the power supply control signal (ICUTX).

Claims

1. A power reception control device provided in a power reception device, the power reception device being included in a non-contact power transmission system that performs non-contact power transmission from a power transmission device to the power reception device through a primary coil and a secondary coil that are electromagnetically coupled, the power reception device supplying power to a battery device, the power reception control device comprising:

a power-reception-side control circuit that controls an operation of the power reception device; and

a power supply control signal output terminal that supplies a power supply control signal to the battery device, the power supply control signal controlling power supplied to the battery device,

the power-reception-side control circuit controlling a timing at which the power supply control signal is output from the power supply control signal output terminal.

2. The power reception control device as defined in claim 1,

the battery device including a battery and a charge control device that controls charging of the battery;

and

the resistance of a current regulation resistor that adjusts a charging current supplied to the battery being controlled using the power supply control signal output from the power reception control device so that the charging current supplied to the battery is adjusted.

3. The power reception control device as defined in claim 2,

the current regulation resistor being an external resistor, and a control element that changes the resistance of the current regulation resistor as the external resistor being provided in the charge control device;

and

the power supply control signal controlling an operation of the control element to adjust the resistance of the current regulation resistor as the external resistor.

4. The power reception control device as defined in claim 1,

the battery device including a battery and a charge control device that controls charging of the battery;

the charge control device controlling a charging current or a charging voltage supplied to the battery to be set at a desired value using a negative feedback control circuit; and

the power supply control signal output from the power reception control device controlling an operation of the negative feedback control circuit included in the charge control device to adjust the charging current.

5. The power reception control device as defined in claim 1,

the battery device including a battery and a charge control device that controls charging of the battery;

the charge control device including a power supply regulation circuit provided in a power supply path connected to the battery; and

the power supply control signal output from the power reception control device controlling an operation of the power supply regulation circuit to adjust the charging current.

6. The power reception control device as defined in claim 1,

the power reception control device further including a load modulation section that modulates a load of the power reception device,

the power-reception-side control circuit causing the load modulation section to intermittently change the load of the power reception device when power is supplied to the battery device through the charge control device, and outputting the power supply control signal from the power supply control signal output terminal to reduce or stop power supplied to the battery device in a period in which the load of the power reception device is intermittently changed.

7. The power reception control device as defined in claim 6,

the power-reception-side control circuit creating a load reduction period in which power supplied to the battery device is reduced or stopped due to output of the power supply control signal, and causing the load modulation section to perform load modulation during the load reduction period.

8. A power reception device comprising:

a power reception section that converts an induced voltage in the secondary coil into a direct-current voltage;

the power reception control device as defined in claim 1; and

an output terminal that outputs a power supply control signal output from the power reception control device to a battery device.

9. An electronic instrument comprising:

the power reception device as defined in claim 8; and

a battery device that receives power from the power reception device.

10. A non-contact power transmission system comprising:

a power transmission device;

a primary coil;

a secondary coil;

a power reception device including the power reception control device as defined in claim 1; and

a battery device that receives power from the power reception device.

11. A charge control device included in a battery device as a power supply target of a non-contact power transmission system,

the charge control device receiving power supplied from a power reception device of a non-contact power transmission system, and controlling charging of a battery included in the battery device,

the operation of the charge control device that controls charging of the battery being controlled using a power supply control signal output from the power reception device.

12. The charge control device as defined in claim 11,

the resistance of a current regulation resistor that adjusts a charging current supplied to the battery being controlled using the power supply control signal.

13. The charge control device as defined in claim 12,

the current regulation resistor being an external resistor, and a control element that changes the resistance of the current regulation resistor as the external resistor being provided in the charge control device;

and

an operation of the control element being controlled using the power supply control signal so that the resistance of the current regulation resistor as the external resistor is adjusted.

14. The charge control device as defined in claim 11,

the charge control device including a negative feedback control circuit, the negative feedback control circuit controlling a current or a voltage supplied to the battery to be set at a desired value,

an operation of the negative feedback control circuit included in the charge control device being controlled using the power supply control signal.

15. The charge control device as defined in claim 11,

the charge control device including a power supply regulation circuit provided in a power supply path connected to the battery,

an operation of the power supply regulation circuit being controlled using the power supply control signal.

16. A battery device comprising:

the charge control device as defined in claim 11; and

a battery, charging of the battery being controlled by the charge control device.