Patent ID: 8344688
Filing Date: 2013-01-01
Classification: H02J

Abstract:
1. A power reception 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 that are electromagnetically coupled, the power reception device supplying a charging power to a battery device that includes a battery and a charge control device that controls charging of the battery, the power reception device comprising: a power reception section that converts an induced voltage in the secondary coil into a direct-current voltage; a power-reception-side control circuit that controls an operation of the power reception device; a load modulation section that modulates a load of the power reception device; and a power supply control signal output terminal that supplies to the charge control device a power supply control signal configured to control power supplied to the battery device, the load modulation section transmitting information from the power reception device to the power transmission device through the primary coil and the secondary coil utilizing load modulation of the load, and the power-reception-side control circuit controlling the power supply control signal to reduce or stop the charging power supplied to the battery through the charge control device 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.