Patent ID: 8060011

Claim:
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 drive clock signal generation circuit that generates a drive clock signal that specifies a drive frequency of the primary coil; a driver control circuit that generates a driver control signal based on the drive clock signal, and outputs the driver control signal to a transmission driver that drives the primary coil; a waveform adjusting circuit that adjusts a waveform of an induced voltage signal of the primary coil and outputs a waveform adjusting signal; a pulse width detection circuit that receives the waveform adjusting signal and the drive clock signal and detects pulse width information relating to the waveform adjusting signal; and a control circuit that detects a change of secondary-side load based on the pulse width information that has been detected.