Boost-flyback converter with interleaved input current and output voltage series connection

This study proposed a high-gain dc-dc converter with an interleaved current at the input stage and voltage series connection at the output stage. This converter was designed based on the boost-flyback topology, which has as main characteristic high voltage gain. Normally, the boost-flyback is designed with the low input voltage, and therefore, the current at this stage reaches high current values, limiting the converter design. Therefore, paralleling the input connection allows the current division between the semiconductors, reducing the switching stress. As part of the converter analysis, in this study, the static and the dynamic converter model are obtained to further design the converter controllers. Furthermore, simulations and experimental results for the proposed converter, operating in closed-looping control, were designed for a peak power of 1.2kW, reaching a maximum efficiency of 97.5%.