Comparison of Soft Switching Methods of DC-AC Full Bridge High-Frequency Link Converter

Abstract

This paper presents a comparative analysis of soft switching methods with modulation on the current-fed (grid) side of a high frequency link converter. The focus is on methods that provide clamping and soft switching without auxiliary circuits. Firstly, the case study converter topology used for the generation of the AC line voltage from the low DC voltage, such as a battery, is presented in brief. Secondly, the time Interval requirements for soft switching conditions are described, and the peculiarities of the studied algorithms are summarized. Finally, the algorithms are verified with a simulation model of a 1 kW converter incorporating thermal models of semiconductor switches. The converter performance in terms of regulation capability, current stresses and semiconductor losses with different modulation methods are analyzed and compared.