Open H‐Bridge Topology‐Based Edge‐Resonant Zero Current Soft‐Switching PWM‐Controlled Bidirectional DC‐DC Converter

Abstract

SUMMARY A novel zero current soft‐switching (ZCS) pulse width modulation (PWM)‐controlled bidirectional DC‐DC converter (BDC) with noninverting polarity for the multi‐mode voltage regulations is proposed in this paper. The multimode voltage regulations, that is, buck, boost and buck‐boost can be attained in the bidirectional power flows, thus energy utilization of DC voltage sources such as a battery can be improved significantly in renewable and sustainable electric power supplies. In addition, all the power devices can commutate by ZCS with the aid of single‐auxiliary switch‐based edge‐resonant cells, thereby the switching power losses can be minimized. The effectiveness of the proposed BDC and its steady‐state characteristics including the voltage conversion ratio and actual efficiency are verified experimentally with a 500 W‐50 kHz prototype.