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

• US 20130088091A1
• Filed: 11/29/2012
• Published: 04/11/2013
• Est. Priority Date: 07/17/2007
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Yoda, Kentaro, Kamijo, Takahiro, Onishi, Kota, Kamiyama, Masayuki, Shiozaki, Nobutaka
• Granted Patent: US 8,836,273 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 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, the power reception device supplying power to a first load, the power reception device comprising:

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

a load modulation section that modulates a second load that is electrically connected to the power reception section; and

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

the load modulation section transmitting information from the power reception device to the power transmission device through the secondary coil to the primary coil utilizing load modulation of the second load,

the power-reception-side control circuit reducing or stopping the power supplied from the power reception section to the first load when the power-reception-side control circuit controls the load modulation section to transmit the information from the power reception device to the power transmission device.

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

the power-reception-side control circuit transmitting the information while reducing or stopping the charging power when the power-reception-side control circuit has determined that the power supplied to the first load is larger than a given value.

3. The power reception device as defined in claim 1,

the power-reception-side control circuit continuing supplying power to the charge control device even when the power-reception-side control circuit has stopped the charging power.

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

the power-reception-side control circuit transmitting a foreign object detection pattern that allows the power transmission device to detect a takeover state by causing the load modulation section to modulate the second load, the takeover state being a state in which the power transmission device:

(1) regards a foreign object placed between the primary coil and the secondary coil as the power reception device and (2) continues power transmission, and

the power transmission device detecting the foreign object by monitoring the foreign object detection pattern of a waveform of the primary coil.

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

the power-reception-side control circuit creating a load reduction period in which power supplied to the first load is reduced or stopped, and causing the load modulation section to perform load modulation during the load reduction period.

6. An electronic instrument comprising:

the power reception device as defined in claim 1; and

the secondary coil.

7. An electronic instrument as defined in claim 6,

the first load including a battery.

8. A non-contact power transmission system comprising:

the power reception device as defined in claim 1;

the power transmission device;

the primary coil; and

the secondary coil.

9. A power reception control method 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, the power reception device supplying power to a first load, the power reception method comprising:

operating a power reception section and converting an induced voltage in the secondary coil into a direct-current voltage;

supplying the direct-current to a first load;

modulating a second load electrically connected to the power reception section;

transmitting information from the power reception device to the power transmission device through the secondary coil to the primary coil utilizing a load modulation of the second load,

reducing or stopping the power supplied from the power reception section to the first load when the power-reception-side control circuit controls the load modulation section to transmit the information from the power reception device to the power transmission device.