Quasi-parallel resonant DC-link inverter with a reduced switch voltage stress

This paper presents a new soft switching inverter with DC-link switch and one auxiliary switch. The important feature of this topology is that the switches voltage stress is lower than that of other quasi-parallel resonant DC-link inverters. All diodes and switches are turned on and off under soft switching conditions. Auxiliary switch is turned on and off under zero current switching conditions, and the DC-link switch is turned on under zero voltage zero current switching condition and turned off under zero voltage switching condition. The proposed converter is analyzed and its operating modes are explained in details. The presented experimental results of a prototype converter confirm the theoretical analysis.