A Common Grounded ASISC High Gain DC-DC Converter with No Oscillation Across Switches

The DC-DC converter is an essential and integral part of fuel cell vehicles (FCVs). Active switched inductor/capacitor (ASISC) based converter is a desirable option for fuel cell vehicles because of its low switching voltage stress, current stress, and straightforward design and control. Although the capacitance and inductance values of the switches of an active switched inductor (ASI) network have a significant impact on the voltage stress in the switches. Because the ASL network's parameters are inconsistent, the switch's inductors and drain-source capacitors form a resonant circuit. This leads to voltage fluctuation across switches, which ultimately results from a sharp increase in switching voltage stress. The converter experiences higher power losses as a result of the voltage oscillation across the switches. In this paper, a new hybrid structure of a DC-DC converter was developed that combines an active switched inductor and a switched capacitor (ASISC). The proposed converter offers a high voltage conversion ratio, reduces voltage stress by mitigating voltage oscillation across switches, and also establishes a common ground between the source and load ends. In this manuscript, the converter's key waveform, fundamental principle, comprehensive steady-state analysis, and design equations are provided. The voltage conversion ratio, current stress, and voltage stress have been calculated and compared with the existing ASISC converters. Finally, a prototype of a 300 W converter with 35V input and 300V output is developed and demonstrated.