A New Topology of Bidirectional Buck-Boost dc/dc Converter with Capability of Soft Switching and input Current Ripple Cancellation

In this paper, a new bidirectional buck-boost dc-dc converter with capability of soft switching and zero input current ripple is proposed. In the proposed topology to eliminate the input current ripple, a coupled inductor is used in input part of the converter. In the proposed converter, ZVS and ZCS can be obtained for main and auxiliary switches, respectively. In this paper, the proposed topology is analyzed in all operating modes and all equations of voltage and current of all components are extracted. Moreover, the required conditions for operating in soft switching and also achieving zero input current ripple are calculated. Finally, the acuracy performance of the proposed converter is reconfirmed through simulation results in EMTDC/PSCAD software program.