Abstract A control scheme of achieving zero-voltage-switching (ZVS) for the non-isolated three-level Buck-Boost bidirectional converter is proposed is the paper. All switches can achieve ZVS in the whole load range without additional circuitry, thereby improving the power conversion efficiency. Furthermore, this scheme utilizes an out-phase control, which can double the inductor current frequency, decrease the inductor volume greatly and improve power density. Firstly, the operation principle of ZVS is analyzed. Secondly, the influence of the reverse current IR on soft-switching during the dead-time interval is explained. Then, the expressions of dead-time and switching frequency are derived. Finally, an experiment prototype is built and tested in both Buck mode and Boost mode to verify the correctness and effectiveness of the proposed scheme.
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2018, Vol. 33 
