POWER FEEDING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a power feeding device that achieves miniaturization and low costs by improving a power factor.SOLUTION: A power feeding device comprises: a power receiving coil 120 for giving and receiving power by magnetic coupling to outside; a bridge circuit with a pair of alternating-current terminals connected to the power receiving coil 120; and a smooth capacitor C. Loads R are connected to both ends of the smooth capacitor C, and the bridge circuit is formed by parallely connecting plural serial circuits of inverted parallel connection circuits to a semiconductor switch and a diode. The power feeding device comprises: current detection means CT for detecting a current of the power receiving coil 120 as an input current; voltage detection means for detecting a voltage across direct-current terminals as an output voltage; and a control device 200 for controlling the semiconductor switch so that the voltage across the alternating-current terminals of the bridge circuit becomes zero only for a constant period before and after two zero-cross points in one cycle of the input current as a center, and becomes positive or negative with a peak value of the output voltage for other periods.