Analysis of improved gain switched inductor super lift cell-based modified SEPIC converter for DC microgrid

An improved voltage gain-based single-ended primary inductor converter (SEPIC) with a charge drive concept is proposed in this paper. Clean energy applications such as photovoltaic (PV) and fuel cells have low-voltage profiles at their output terminals. As a result, a DC–DC converter with enhanced voltage gain is essential. A charge drive topology comprises a switched inductor with a super lift cell (SISL). The modified SEPIC topology is analyzed by integrating the symmetrical (SSISL) structure of the SISL cell. When correlated to the other analogous converters, the foremost advantages of the proposed SISL SEPIC converter are decreased voltage stress and improved voltage gain at less duty cycle. This paper examines the operating principle, theoretical analysis, design procedure and comparison of the proposed converters with other converters from the literature that employs related operating principles. The small signal modeling of the proposed converter is performed and pole-zero positions are examined. Eventually, experimental results for the laboratory prototype with a power rating of 100 W and 50 kHz switching frequency are provided to assure the performance of the converter and also to validate the theoretical study.