A High Step-Up DC–DC Converter

A high step-up dc-dc converter (HSUC) is proposed, which uses a coupled inductor and a boost unit to improve boost capability. The proposed converter has the characteristics of large voltage gain and low voltage stress of semiconductors. Thus, MOSFETs with low rated voltage can be used to reduce conduction loss. Besides, since a boost inductor is placed in the input source, the input current is continuous, which is beneficial for battery and the renewable energy resources. The working principle is illustrated in detail. Comparison among different HSUCs is discussed in detail. Finally, a simulation model is built in PSIM. Simulation results confirm the theoretical analysis.