volume | PIER Journals

Abstract

This article presents an improved power quality (IPQ) soft-switched diode-driven capacitor (DDC) cell converter for high-gain DC-DC conversion applications. The modified sixth-order DDC cell converter offers several advantages over conventional designs, including common ground configuration, reduced pulsating source current, non-inverted output voltage, and a high voltage gain of (1+D)/(1-D)). A single-capacitor auxiliary circuit is employed to facilitate soft-switching operation by reducing switching stress and minimizing switching losses. The proposed converter achieves zero-voltage switching (ZVS) and zero-current switching (ZCS) conditions without significantly increasing circuit complexity or auxiliary component count. Comprehensive steady-state and small-signal analyses are carried out and validated through MATLAB/Simulink simulations and a 600 W experimental prototype. Experimental results demonstrate improved efficiency, reduced voltage stress, and enhanced input-side power quality with input current THD limited to 3% under rated operating conditions. Owing to its simple structure, reduced switching losses, and high voltage gain capability, the proposed converter is suitable for high-performance DC-DC power conversion applications.

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Mr. Mirza Jawad Baig

Dr. Rishi Kumar Singh