Patent ID: 8604666

Claim:
A power generating device comprising: a piezoelectric member that is formed from a piezoelectric material; one pair of electrodes that are installed to the piezoelectric member; a transformation unit that repeatedly transforms the piezoelectric member; an inductor that is installed between the one pair of electrodes and configures a resonance circuit together with a capacitive component of the piezoelectric member; a switch that is connected to the inductor in series; and a switch control unit that connects the switch when a transformation direction of the piezoelectric member is switched, and cuts off the switch when a time corresponding to a half period of a resonance period of the resonance circuit elapses; a rectifier circuit that is connected to the one pair of electrodes and rectifies an AC current generated by the piezoelectric member; a current detecting unit that detects presence of a current flowing through the rectifier circuit from the piezoelectric member, wherein the switch control unit is a unit that connects the switch when no current has flowed through the rectifier circuit from the piezoelectric member.