Dual Duty Triple Mode Active Switched Inductors DC-DC Converter with Reduced Switch Voltage Stress

This paper presents a new dual-duty triple switch (DDTM) high-voltage gain DC-DC converter topology for DC microgrids. The proposed DC-DC converter integrates a modified active switched inductors (mASL) cell with a symmetrical switched capacitors (SSC) cell to achieve very high voltage gain and very low voltage stress. The mASL cell incorporates a unidirectional switch across the inductors of the conventional ASL cell, enabling dual-duty triple-mode operation. This feature adds flexibility in achieving the desired output voltage using different combinations of duty cycles. The SSC cell of the proposed converter not only enhances the voltage gain but also suppresses voltage oscillations in the ASL cell, resulting in reduced voltage stress across the switches. The operating principles, steady-state analysis, and comparative evaluation are provided. Finally, the performance of the proposed converter is validated using a laboratory prototype (24V/318V).