A Bidirectional DC–DC Converter With Direct Power Transfer

Abstract

This paper presents a novel bidirectional DC–DC converter for several applications such as energy storage systems. The proposed power circuit topology not only has inherent soft switching but also offers reduced conduction losses. The reduction in conduction losses is achieved through a direct power transfer (DPT) path, which can effectively bypass the transformer as well as power semiconductors at the primary side, and transfer power directly to the secondary side. In addition, The power circuit offers flexibility to shape the input current waveform to have lower peak values, resulting in further reduction in conduction losses. Thus, the proposed circuit can potentially provide high efficiency by reducing both the conduction losses and switching losses simultaneously. Theoretical analysis, simulation results, and experimental results demonstrate the feasibility of the proposed circuit and its superior performance.

Keywords

• Bidirectional converters
• coupled inductors
• DC–DC converters
• direct power transfer (DPT)
• dual active bridge (DAB)
• soft switching