A quadratic high-gain DC–DC converter integrating a two-winding coupled inductor with low voltage stress on both switches for renewable energy applications

This paper introduces a quadratic, high-gain DC–DC converter tailored for renewable-energy interfaces. The architecture marries a quadratic step-up stage with a two-winding coupled inductor (CI) to deliver a large voltage boost. Voltage gain is tunable via two independent knobs the switches’ duty cycle and the CI turns ratio giving the designer extra freedom. Hallmark features include very high gain, low voltage stress on the switches, continuous input current, a shared ground at input and output, high efficiency, and synchronized gate drive. We detail the operating modes, steady-state characteristics, design rules, and efficiency metrics, and we provide dynamic modeling with control analysis. To showcase its benefits, the proposed converter is benchmarked against related topologies. Its practicality is validated on a 400-W prototype operating at 50 kHz, stepping 25 V up to 400 V.