Design and implementation of modified SEPIC DC–DC converter

A high-gain converter based on a modified single-ended primary inductor converter (SEPIC) is proposed in this paper. Unlike traditional designs, significant voltage gain is obtained by incorporating an active switched capacitor cell and switched inductor cell in the SEPIC topology. These cells effectively reduce voltage stress on the switch, enhancing overall efficiency. Comparative analysis with existing SEPIC topologies considers parameters such as component count, voltage gain, voltage stress, and efficiency. The converter's performance undergoes analysis utilizing the MATLAB Simulink tool, assessing a voltage range of 20–200 V and delivering a power output of 100 W. The proposed converter provides a voltage gain of 10 when operated with a duty ratio of 54.8%, whereas a voltage gain of 53 is obtained with an 80% duty ratio. Simulation results indicate an efficiency of 96% under rated conditions. Furthermore, the steady-state analysis of the converter, along with the voltage and current on its power semiconductor components, is examined in detail. Loss distribution and efficiency analyses are conducted. An experimental hardware prototype model is developed to validate both the simulated and theoretical analyses. Its ability to handle continuous input currents renders it ideal for applications in renewable energy system and fuel cell.