CONTACTLESS POWER TRANSMISSION DEVICE

摘要

A contactless power transmission device includes a power receiver (110), a power feeder (101) configured to contactlessly feed power to the power receiver (110), the power feeder (101) including a primary coil (122) configured to generate magnetic flux by an input alternating current voltage, and a cover (121) configured to cover the primary coil (122), and a capacitive sensor (106) configured to supply an alternating current voltage to an electrode (117) to measure a capacitance occurring between the electrode (117) and foreign matter (123) present around the cover (121) and thereby detect the foreign matter (123). The frequency of the alternating current voltage of the capacitive sensor (106) is set to be higher than the frequency of the magnetic flux generated by the primary coil (122).