Dual-Input High Step-Up Boost-SEPIC Converter With Common Ground

This paper proposes a dual-input single-output high step-up converter for use in renewable energy systems. In this converter, the boost and SEPIC structures are integrated. To achieve high voltage gain with a low component count and high power density, the SEPIC second inductor is coupled with the boost inductor. A passive clamp circuit absorbs the leakage inductance energy and recycles it to the load. Thus, the switch voltage stress at the turn-off moment is limited. The switch voltage stress decreases, and the converter benefits from a common ground between the input and output. Moreover, all the switch sources are connected to the ground. Hence, the converter control circuit is simple. In this converter, all diodes turn off at the ZCS condition, and the reverse recovery problem is eliminated. In this article, the proposed converter operating principles are investigated, and the converter is analyzed. To demonstrate the advantages of the converter, the proposed converter is compared with its counterparts. The experimental results for the 100 W prototype confirm the results of the theoretical analysis.