High Step-Up Cascade Boost DC-DC Converter Using Coupled Inductor with Ripple-Free Input Current

摘要

This paper proposes a high step-up cascade boost DC-DC converter using a coupled inductor with ripple-free input current. The proposed converter is based on a conventional cascade boost converter for high step-up. In the proposed converter, the first boost cell cancels the input current ripple with a small auxiliary circuit, as well as increases the voltage gain. Therefore, the input current ripple is significantly removed by the ripple-free circuit. In the second boost cell, the turn ratio of a coupled inductor is utilized to further increase the voltage gain in comparison with the conventional cascade boost converter. The theoretical analysis and performance are proved by experimental results from an output 200-[V], 200-[W] prototype of the proposed converter.