WIRELESS POWER TRANSMISSION APPARATUS AND WIRELESS POWER SUPPLY SYSTEM

A wireless power transmission apparatus includes a power transmission resonance mechanism including a wireless power transmission coil and a power transmission resonance capacitor; a power transmission circuit that performs switching of the power transmission resonance mechanism at a predetermined switching frequency; a voltage conversion circuit that performs voltage conversion on an input power supply voltage; an intermediate capacitor between the voltage conversion circuit and the power transmission circuit and shared between the voltage conversion circuit and the power transmission circuit; an intermediate input current detection circuit that detects an intermediate input current input to the power transmission circuit from the voltage conversion circuit; and an electric power management circuit that, by setting an upper limit value for the intermediate input current and controlling an output voltage of the voltage conversion circuit, adjusts the amplitude of a DC voltage or current intermittently provided to the power transmission resonance mechanism.