Analysis and design of high step-up DC-DC converter with coupled-inductor technique

In this paper, a novel high step-up converter with coupled inductor boost converter is proposed. The circuit topology of the proposed converter is derived from conventional boost converter with coupled inductor connection such that high step-up voltage gain with proper duty ratio is achieved. Besides, the coupled-inductor technique concept also can be adopted to construct other step-up converters. The operating principle, steady-state analysis, and efficiency analysis are presented. Finally, an experimental prototype with 24 V input and 200 V/ 2.5 A output is implemented to verify the theoretical analysis.