Performance Evaluation of SiC-based Isolated Bidirectional DC/DC Converters for Electric Vehicle Charging

In this paper, six 10 kW DC/DC isolated and bidirectional dual active bridge topologies, supplied by +750/0/-750V three-wire DC bus, are evaluated based on efficiency, loss distribution, volt-ampere semiconductors ratings and normalized cost of SiC MOSFETs for electric vehicle charging applications. The selected topologies are evaluated under the same voltage and power conditions, through electrothermal simulations and experiments. The simulation results were verified through experiments conducted on 5 kW prototypes of four of the considered topologies. The advantages and disadvantages of the topologies are discussed and analyzed based on the chosen performance metrics. It has been shown that series-resonant input-series output-parallel full-bridge DAB topology exhibits the highest efficiency while the active neutral point clamped (ANPC) DAB topology can be designed with the lowest cost. However, considering a fair trade-off between all the performance metrics, series-resonant ANPC DAB topology is shown to be the best design choice for the considered evaluation conditions.