An Expandable Buck-Boost Converter for Wide Range Input Voltage Variations

This paper introduces an innovative transformerless buck-boost DC-DC converter utilizing switched capacitor (SC) and switched inductor (SL) cells, with a positively controlled output voltage. The proposed converter’s elaborate design enables the attainment of significant voltage gain. Moreover, because of its reliance on a continuous input current, it is appropriate for applications based on renewable energy. The fundamental operations of buck and boost modes, steady-state analysis, voltage gain, and design methodology are examined comprehensively. The proposed converter is ultimately simulated in PSIM software and realized in a prototype to validate the theoretical analyses. The findings of the simulation and experiments are presented for both buck and boost modes. The input voltage ranges from 12 V to 36 V, while the output voltage stabilizes at 24 V. The converter’s maximum output power is 100 W.