Design and implementation of a zero voltage transition bidirectional DC‐DC converter for DC traction vehicles

摘要

This paper presents a new soft-switching non-isolated bidirectional converter (BDC) for the energy storage systems in DC traction. For this proposed converter, the soft commutation is achieved by turning on the main power switches with the help of auxiliary active switches, the inductor, the capacitor, and diodes. The basic operation of the converter is characterized as two operating types: boost and buck. The switching devices obtained zero voltage transition (ZVT) in both operating types, but the major advantage of this topology is achieved by reducing turn-on losses with improved efficiency and minimizing reverse recovery time of IGBTs' anti-parallel diodes. This paper mainly describes the principles of operation, design analysis, simulation, and implementation of DC-DC converter of laboratory prototype with 150 V/250 V system under 1-kW output power.