A Comparison of 100 kW SiC DC-DC Converters for Electric Vehicles

This paper compares three different dc-dc topologies, i.e. boost converter, three-level flying capacitor multilevel converter (FCMC)and one-cell switching tank converter (STC)for a 100 kW electric vehicle power electronic system. This bidirectional dc-dc converter targets 300 V-600 V voltage conversion. Total semiconductor loss index (TSLI)has been proposed to evaluate topologies and device technologies. The boost converter and one-cell STC have been fairly compared by utilizing this index. The simulation results of a 100 kW one-cell STC working at zero current switching (ZCS)mode have been provided. A 100 kW hardware prototype using 1200 V 600 A SiC power module has been built. The estimated efficiency is about 99.2% at 30 kW, 99.13% at half load, and 98.64% at full load. The power density of the main circuits is about 42 kW/L.