An Improved Phase-Shifted Full-Bridge Converter with Extended ZVS Operation Range for EV Battery Charger Applications

In this paper, an improved phase-shifted full-bridge dc-dc converter with current doubler rectifier for electric vehicles is introduced. By use of coupled inductors as opposed to output filter inductors, the circulating current, RMS current, and voltage stress on output capacitor are reduced. Therefore, the zero voltage switching range is extended and higher efficiency from light load to full load is obtained. The two coupled inductors which have small secondary inductors are used in proposed converter. Thus, neither extra components nor auxiliary circuits are needed which leads to control simplicity and prevent extra costs and bulky size. As a result of this topology, the required energy for soft switching, voltage stress across secondary side, RMS current, and circulating current are decreased. Finally, the simulation results validate the major befits of the proposed EV battery charger.