RESONANT TRANSMITTING POWER-SUPPLY DEVICE AND RESONANT TRANSMITTING POWER-SUPPLY SYSTEM

摘要

This resonant transmitting power-supply device is provided with the following: a pulse input circuit (134) that inputs voltage pulses to a transmission antenna (2) at set intervals; a resonant-frequency-varying circuit (11) that, when a voltage pulse is inputted by the pulse input circuit (134), varies the resonant frequency of the transmission antenna (2) so as to perform resonant-frequency sweep detection; a frequency-characteristics detection circuit (12) that detects the frequency characteristics of the transmission antenna (2) when the resonant-frequency-varying circuit (11) performs the aforementioned resonant-frequency sweep detection; a foreign-object detection circuit (136) that uses detection results from the frequency-characteristics detection circuit (12) to detect the presence or absence of foreign objects in an electromagnetic field generated by the transmission antenna (2); and a power control circuit (137) that reduces or stops the supply of power to the transmission antenna (2) if a foreign object has been detected by the foreign-object detection circuit (136).