Study and implementation of an isolated bidirectional resonant converter with natural commutation

This paper presents the study and implementation of an isolated bidirectional resonant converter with natural commutation. It can be operated in natural commutation without additional control. The proposed isolated bidirectional resonant converter works like a DC transformer, which can be applied for DC micro-grid systems. Compared with the conventional phase-shifted full-bridge converter and current-fed full-bridge converter, the proposed resonant converter presents better performance in efficiency, control and cost. The operating principles and design considerations are discussed and analyzed in details. Finally, a laboratory prototype converter has been built and tested to verify the feasibility of the proposed scheme. High efficiency and simple control can be achieved.