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

Disclosed is a resonant type transmission power supply device including a transmission power state detecting circuit to detect a transmission power state of a transmission antenna a foreign object detecting circuit to detect 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 transmission power state detecting circuit , and a power control circuit to reduce lit or stop the supply of electric power to the transmission antenna when foreign object is detected by the foreign object detecting circuit