Abstract
The transient performance during power reversal in a bidirectional dual active bridge (DAB) dc-dc converter usually suffers from the issues of current deviation, hard switching, and other induced problems. In this article, a novel phase-shift method for fast power reversal in a DAB converter is proposed, which can achieve transient zero voltage switching (ZVS) without dc current bias, and therefore, shows advanced transient performance. The detailed algorithms and the effective phase-shift ranges based on different voltage conversion ratios are elaborated. An error analysis of the performance of dc bias elimination is provided to evaluate probable errors within allowed tolerances. Extensive and comparative experimental results are provided to support the validity of the proposed phase-shift method. It is shown that smooth, fast, and reliable power reversal can be effectively achieved with the novel method, and there is no need to add snubbers into the circuit by virtue of transient ZVS.
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