Simulation and Hardware Realization of Open-loop SPS Controlled SiC-based DAB Converter for Battery Charging

Abstract

The use of SiC MOSFETs enables faster switching, reduced conduction losses and higher breakdown voltage, making them ideal for high-frequency isolated power conversion. This paper presents the design and simulation of a silicon carbide (SiC) based dual active bridge (DAB) converter for electric vehicle (EV) battery charging applications. The converter operates at a switching frequency of 50 kHz, interfacing a 400 V DC source with a 60 V battery load. The power transfer is obtained by using single phase-shift (SPS) control strategy. A detailed analysis is developed to investigate the influence of leakage inductance and phase-shift angle on power transfer capability. Simulation results or a 5 kW, 400 V/60 V EV battery are presented to justify its compatibility in battery chargers. A hardware prototype of a DAB using SiC-based H-bridges interconnected via a highfrequency transformer and a leakage inductor is implemented for a resistive load. The SPS control is implemented using TMS320F28379D microcontroller to control the power transfer in the DAB converter. This work can be further extended in both simulation/hardware to charge EV battery in constant currentconstant Voltage (CC-CV) charging mode using an advanced closed-loop control technique, which is essential for optimizing battery charging performance.