A Common Grounded Nonisolated ASISC High Gain DC–DC Converter With Oscillation Mitigation Across Switches

Abstract

In a fuel cell vehicle (FCV), the dc–dc converter is an integral part. Active switched inductor/capacitor (ASISC)-based topology is an attractive solution for FCV because it has low switch voltage stress, current stress, and simple design and control. However, the voltage stress in the switches of an active switched inductor (ASI) network is very sensitive to the switch's capacitance and inductance values. The inductors and drain-source capacitors of the switch constitute a resonance circuit due to the parameters' inconsistency of the ASI network. This introduces voltage oscillation across switches and eventually, the switch voltage stress shoots up. The oscillating voltage increases the power loss in the converter. In this article, a new hybrid structure of an ASISC dc–dc converter is derived. The proposed converter provides a high voltage conversion ratio, mitigates voltage oscillation across switches, resulting in reduced voltage stress across switch, and provides common ground between source and load ends. This article gives the converter key waveform, operating principle, detailed steady-state analysis, and design equations. The voltage conversion ratio, voltage stress, and current stress are derived and compared with existing ASISC converters. Finally, the prototype is developed and the working is demonstrated with 300 W for voltage conversion from 35 to 300 V.