Analysis and design of current-fed two inductor bi-directional DC-DC converter using resonance for high efficiency and high step-up application

This paper proposes current-fed two-inductor bi-directional DC-DC converter using resonance(CF_TIBCR) for high efficiency and high step-up applications. Conventional dual half bridge(DHB) converter have problems of high voltage spikes and unavailable charge/discharge resulting from uni-directional converter. Hence, operating frequency and the efficiency are also limited. To solve these problems and achieve high efficiency, in this paper, the diode of the high voltage side is replaced by metal oxide semiconductor FET(MOSFET). All active switches undergo zero voltage switching(ZVS) condition. Especially, switches of the low voltage side are satisfied with zero current switching(ZCS) condition and ZVS condition. The steady state analysis and operation principle of CF_TIBCR is introduced. The DC voltage conversion ratio is derived based on steady state analysis. Simulation using PSIM is implemented to verify CF_TIBCR.