100kW Soft Switching Three-Phase Inverter with Hybrid Switches

To improve the efficiency of the active-clamped soft-switching three-phase inverter, a hybrid switch solution is proposed. SiC MOSFET is used for the auxiliary switch while Si-IGBT is still used for the main switches. Both the six main switches and the one auxiliary switch can realize soft-switching. In addition, extra loss induced by the auxiliary circuit is reduced with the adoption of SiC devices. The inverter operation principles are introduced and its loss distribution is analyzed. Finally the inverter performance is experimentally verified on a 100kW prototype.