Nonisolated high gain hybrid switched-inductor DC-DC converter with common switch grounding

Abstract

This paper presents a methodology that integrates the hybrid switched inductor (HSL) and split duty ratio techniques to synthesize a high gain converter with common switch grounding (HSL-CSG). The DC-DC converter's high gain feature is required for microsource power processing in low voltage renewable energy systems. The amplification in voltage gain of the proposed converter is achieved without using transformer, common core coupled inductors, voltage multipliers, intermediate capacitors, and voltage lifting methods so that the topology is simple in construction and operation. Moreover, with a split duty ratio the proposed converter switches are less prone to current stress due to reduction in extreme conducting duty intervals. The topological derivation, operating principle, analysis of both continuous conduction mode (CCM), and discontinuous conduction mode (DCM) are presented. The theoretical analysis is validated with the aid of a laboratory prototype.