This article proposes a new non-isolated ZCS bidirectional buck-boost dc-dc converter for energy storage applications. The conventional bidirectional converter derived with auxiliary edge resonant cell to obtain ZCS turn-on/turn-off condition of the main switches. The proposed converter is operated in boost and buck modes with soft-switching operations in order to have minimized current stresses and reduced switching losses since the resonating current for the zero current switching does not flow through the main switches. The proposed converter improves the overall efficiency over hard-switching converter for high power energy storage applications. This paper mainly describes the operation principles, design analysis, simulation evaluation and its validation by the experimental results which were proved the soft-switching capability of this converter.

Keywords: Dc-dc, Soft-switching, Zero current switching (ZCS), Bidirectional converter