| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless power supply device, power reception device, and power transmission system capable of detecting an event disturbing a resonance state such as mixing of foreign matters and power theft.SOLUTION: A wireless power supply device 2f transmits a power signal including any of an electric field, magnetic field, and electromagnetic field to a wireless power reception device. A transmission antenna 20 includes a transmission coil L. An automatic tuning auxiliary circuit 30f is coupled to the transmission antenna 20 in series. A power supply 10 applies AC drive voltage between both ends of the transmission antenna 20 and automatic tuning auxiliary circuit 30f. A first control unit 40 switches each of a plurality of switches SW1 and SW2 in synchronization with the drive voltage. A voltage monitoring unit 36 monitors voltage Vgenerated at an auxiliary capacitor C. |
