Novel soft switched three-phase voltage source converters with reduced auxiliary switch stresses

Abstract

This paper proposes new three-phase ZVT topologies. With a split DC link, the auxiliary switch voltage rating is reduced to half DC-link voltage, so the conduction loss and switching loss in the auxiliary circuit are significantly reduced compared to previous ZVT circuit. With the ZVT circuit reducing main switch turn-on loss, the converter can be operated at high switching frequencies efficiently and reliably, achieving higher power density and better control performance. Simulation and experimental results are presented to verify the analysis.