Bidirectional isolated ZVS DC-DC converter with auxiliary active switch for high-power energy storage applications

This paper describes topology and control algorithm of a bidirectional isolated converter with controlled semiconductors at the voltage-fed and current-fed parts. A bidirectional switch connected in series with the transformer winding at the current-fed side features zero-current switching and allows achieving zero-voltage-switching of transistors at the voltage-fed side by utilising leakage inductance of the isolated transformer. The topology is proposed for high power battery or fuel cell systems. The proposed ideas are verified with simulations in MATLAB and evaluation prototype.