Generalized Switch Current Stress Reduction Technique for Coupled-Inductor-Based Single-Switch High Step-Up Boost Converter

Coupled-inductor-based boost converters suffer from high switch current stress in steady state and transient due to less self-inductance value in their winding. In this article, a generalized switch current stress reduction technique is proposed by modifying circuit topology of coupled-inductor-based high step-up boost converter (CIHBC). This is achieved by a half-cycle resonating branch utilizing inductance of coupled inductor. Furthermore, applying the concept, a coupled inductor boost converter is proposed for achieving high step-up ratio with low switch current and voltage stress. The operation of the proposed converter using a resonating branch is discussed in both continuous and discontinuous conduction modes. The theoretical findings are verified through a simulation study in PSIM 9.1.1. A prototype converter of 100-W output power is designed to prove the concept and for performance analysis of the proposed converter.