High-Power Isolated Bidirectional Three-port DC-DC Converter for Level-1 and Level-2 Charging

This paper proposes a Gallium Nitride high-electron mobility transistor (GaN HEMT) based three-port DC-DC converter for Level-1 and Level-2 electric vehicle charging. The three-port converter (TPC) is based on an isolated bidirectional Dual Active Bridge (IBDC-DAB) configuration for battery charging applications. The proposed DAB based TPC uses fewer components as compared to separate charger systems. The phase-shift control method is implemented to control the output power of the IBDC-DAB based converter with two charging output ports. The highest efficiency of 98.86% is achieved with the proposed converter at a phase-shift of 0.3889. The output ports 2 and 3 are designed for Level-1 and Level-2 EVB charging. Maximum power of approximately 2 kW for Level-1 and 12 kW for Level-2 is achieved for output Port 2 and 3 at an overall efficiency of 97%. The performance metrics of the IBDCDAB-based TPC have been analyzed and simulation is performed using LTspice XVII software. The results are presented for validation.