POWER CONVERSION DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

摘要

A power conversion device includes a step-down-type transformer and a bridge circuit that rectifies output voltage of the transformer and supplies the rectified output voltage to a load. The bridge circuit is connected to a secondary winding of the transformer and includes MOS-FETs connected in series and diodes connected in series. A gate of the MOS-FET is connected to one end of a primary winding of the transformer with a capacitor interposed therebetween and a gate of the MOS-FET is connected to the other end of the primary winding of the transformer with a capacitor interposed therebetween. With this, a power conversion device and a wireless power transmission system that can achieve space saving and reduce loss in a rectifying element are provided.

主权项

1. A power conversion device comprising:
an alternating-current (AC) voltage input unit; a transformer that has a primary-side terminal pair and a secondary-side terminal pair and the primary-side terminal pair being connected to the AC voltage input unit; and one or a plurality of rectifying elements have first terminals and second terminals and cause electric current to flow to the second terminals from the first terminals, wherein the one or plurality of rectifying elements are provided at a secondary side of the transformer, rectify output voltage of the transformer, and supply the rectified output voltage to a load, at least one of the plurality of rectifying elements is a rectifying unit which includes a switch element having a control terminal and a diode and the switch element and the diode are connected in parallel such that an anode of the diode is at the first terminal side and a cathode of the diode is at the second terminal side, and the control terminal of the switch element is connected to one or the other of the primary-side terminal pair of the transformer.