Coupled Inductor Based Soft-Switched Ultra High-Gain Converter with Voltage Quadrupler cell

Abstract

This research introduces a coupled inductor-based high gain non-isolated DC-DC converter for DC microgrid systems. A coupled inductor and a voltage multiplier circuit are used to provide high gain at a low duty ratio. The main side interleaving lowers the source current ripple. An active clamp auxiliary resonant circuit was included in the converter's primary switches for soft switching. To reduce switching losses, Zero Voltage Switching (ZVS) turn-ON and Zero Current Switching (ZCS) turn-OFF are achieved. The voltage quadrupler circuit for the proposed converter has ZCS turn-OFF on all of the diodes. The voltage stress on all MOSFETs and diodes has been significantly reduced, further reducing loss during switch conduction and increasing the converter's efficiency. This proposed theoretical concept is validated through simulation at 200kHz, which converts 24 $V$ to 400 $V$.