A New Non-isolated ZCS Bidirectional Buck–Boost DC–DC Converter for Energy Storage Applications in Electric Vehicles

This paper proposes a new ZCS non-isolated 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 of the topology, simulation evaluation, and its validation by the experimental results on 50 V–120 V–300 W system, which proved the soft-switching capability of this converter and its performance.