POWER FEED DEVICE AND METHOD FOR ACQUISITION OF FREQUENCY CHARACTERISTICS

Inverter (203) supplies an alternating current (AC) power of a constant voltage or a constant current to power supply coil (104a) while varying a drive frequency. Frequency characteristic acquisition unit (105) acquires frequency characteristics of a current value associated with a current flowing through power supply coil (104a) that receives the supplied AC power, or a voltage value associated with a voltage applied to power supply coil (104a).