Patent ID: 8111041

Claim:
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.