Analysis, Design and Simulation of Bidirectional DC- DC Converter

Abstract

Abstact-A bidirectional DC-DC Converter by using proportional integral controller is designed and simulated in this paper. The proposed converter employs a coupled inductor with same winding turns in primary and secondary sides. In step-up mode, to achieve high step-up voltage gain, the primary and secondary windings of the coupled inductor are charged in parallel and discharged in series. In step-down mode, to achieve high step-down voltage gain, the primary and secondary windings of the coupled inductor are charged in series and discharged in parallel. The structure of the proposed converter is very simple. Thus, the proposed converter has higher step-up and step-down voltage gains than the conventional bidirectional boost/buck converter. The operating principle and efficiency analysis are discussed in detail. Finally, a 14/42-V circuit in closed loop mode is designed and simulated to verify the performance for the automobile battery system.