Bidirectional push–pull/H‐bridge converter for low‐voltage energy storage system

Abstract

Abstract A bidirectional push–pull/H‐bridge DC/DC converter for a low‐voltage energy storage system is proposed in this paper. It comprises the push–pull converter, the phase‐shifted H‐bridge converter, and the transformer. The push–pull converter is connected to the low‐voltage side, and it is controlled by 0.5 fixed duty ratio. The phase‐shifted H‐bridge converter is connected to the high‐voltage side, and it is controlled by an extended phase shift scheme with zero voltage switching (ZVS). Compared with the conventional dual active bridge (DAB) DC/DC converter, the proposed converter has a simple structure—there are only two power switches with a common ground and simple gate‐driving circuits in the low‐voltage side. The 600‐W laboratory prototype was developed to confirm the theoretical analysis and the validity of the proposed converter.

Keywords

• DC–DC power convertors
• energy storage
• bidirectional DC/DC converter
• push–pull DAB converter
• extended phase shift control