A modular DC-DC converter with zero voltage switching capability

A bidirectional DC-DC converter with high power density is proposed in this paper. The presented converter provides power transfer in both directions only with adjusting phase-shift angle. Zero voltage switching (ZVS) in both turn on and turn off moments of all switches is the major capability of the converter that makes it suitable for high-power applications. ZVS of the converter is provided without any auxiliary devices. High-frequency transformers are employed in the converter structure to match the converter two sides voltage. Moreover, the transformer leakage inductance along with external auxiliary inductance acts as energy storage in power transfer from one side of the converter to the other side. Steady-state operation of the converter is analysed. ZVS criteria for the proposed converter are studied and finally, experimental measurement results of laboratory-scale prototype are presented. Copyright © 2020 Inderscience Enterprises Ltd.