Abstract
DC-DC converter with high gain and low input current ripples is an essential requirement of DC power system such as photovoltaic and energy storage systems. This paper proposed a dual coupled-inductor based bidirectional two stage DC-DC converter. The main structure of converter adopts input parallel output serial (IPOS), which can not only reduce input current ripple, but also increase voltage gain. Introduction of double coupled-inductor and voltage multiplying unit can further increase the voltage gain, and decrease power switch voltage stress as well as widen suitable applications of power switches. During step-down mode, the power switches are fully controlled, which can obtain greater step-down voltage ratio to avoid extreme duty cycle. The simulation results prove the correctness and feasibility of the proposed topology.
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