Family of modular, extendable and high gain dc-dc converter with switched inductor and switched capacitor cells

Abstract

This study presents a family of novel high gain non-isolated hybrid dc-dc converter for dc micro grid application. The proposed family of the converter is developed by employing both inductor-capacitor-inductor (LCL) based switched inductor (SI) and switched capacitor (SC) technique to achieve high voltage gain. Appropriate increase in the number of LCL-based SI cells in the power circuits in order to achieve ultra-high voltage gain allows formulating a generalised structure of the circuit. Incorporation of SI & SC techniques and the structure of the circuit with one stage power transfer ensure high voltage gain at low voltage stress across the switches and diodes. The study includes the principle of operation, steady-state analysis and performance analysis in detail for the converters. Experimental results from the developed hardware prototype of 380 V/250 W validate the adopted concept, design and exemplify that the proposed family of converter operates at a full load efficiency of 94%.