RESONANT TYPE TRANSMISSION POWER SUPPLY DEVICE AND RESONANT TYPE TRANSMISSION POWER SUPPLY SYSTEM

摘要

A resonant type transmission power supply device includes a pulse input circuit that inputs a pulse voltage to a transmission antenna at set intervals, a variable resonance frequency circuit that causes the resonance frequency of the transmission antenna to be variable and performs sweep detection of the resonance frequency when a pulse voltage is inputted, a frequency characteristic detecting circuit that detects a frequency characteristic of the transmission antenna when the sweep detection is performed, a foreign object detecting circuit that detects the presence or absence of a foreign object in an electromagnetic field generated from the transmission antenna on the basis of a detection result acquired by the frequency characteristic detecting circuit, and a power control circuit that reduces or stops the supply of electric power to the transmission antenna when a foreign object is detected.

主权项

1. A resonant type transmission power supply device comprising:
a pulse input circuit to input a pulse voltage to a transmission antenna at set intervals; a variable resonance frequency circuit to cause a resonance frequency of said transmission antenna to be variable and perform sweep detection of the resonance frequency when a pulse voltage is inputted by said pulse input circuit; a frequency characteristic detecting circuit to detect a frequency characteristic of said transmission antenna when the sweep detection of the resonance frequency is performed by said variable resonance frequency circuit; a foreign object detecting circuit to detect presence or absence of a foreign object in an electromagnetic field generated from said transmission antenna on a basis of a detection result acquired by said frequency characteristic detecting circuit; and a power control circuit to reduce or stop supply of electric power to said transmission antenna when a foreign object is detected by said foreign object detecting circuit.