Open H-Bridge Topology-based Edge-Resonant Zero Current Soft-Switching PWM-Controlled Bidirectional DC-DC Converter

Abstract

A novel zero current soft-switching (ZCS) pulse width modulation (PWM)-controlled bidirectional DC-DC converter (BDC) with non-inverting polarity for the multi-mode voltage regulations is proposed in this paper. The multi-mode voltage regulations, i.e. 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 experimentaly with a 500W-50kHz prototype.