POWER TRANSMISSION DEVICE AND NON-CONTACT POWER TRANSMISSION APPARATUS

This power transfer device is provided with an alternating current power supply, primary-side coil, control unit, control power supply, and switch. The alternating current power supply has a first converter that converts external power into first direct current power and a second converter that outputs power by converting direct current power into alternating current power at a predetermined frequency. The second converter outputs, as alternating current power, first alternating current power in the cases where the first direct current power is inputted from the first converter, and outputs, as alternating current power, a second alternating current power having a power value smaller than that of the first alternating current power in the cases where second direct current power is inputted from the control power supply.