Isolated DC-DC zero voltage switching converter for battery charging applications

This paper discusses about a resonant topology of the Isolated DC-DC converter. The main aim is to obtain the zero voltage switching (ZVS) for the lower leg switches (M3 and M4) of the converter with the help of resonant circuit i.e. resonant inductor provided in the circuit minimizes the power losses In addition, the leakage inductance of transformer helps in achieving zero current switching (ZCS). Thus by achieving soft switching and eliminating the conventional RCD voltage clamping circuit for the proposed converter, the losses are minimized and the efficiency is improved accordingly. The converter has applications in on-board charger for plugin hybrid electric vehicles.