EV Battery Charging using DAB DC-DC Converter with EPS and DPS modulations

A Dual active bridge (DAB) DC-DC converter comprises two active H-bridges interfaced by a high-frequency transformer (HFT). There are several points of interest in a DAB DC-DC converter as far as the charging application is concerned, such as bidirectional power transfer capabilities, galvanic isolation between the input and output ports, and inherent zero voltage switching (ZVS) features. The DAB DC-DC converter is extensively studied to be designed and suited for various applications, especially EV charging applications. In this work, the DAB DC-DC converter is analysed to operate in the constant current (CC) and constant voltage (CV) operating modes for EV battery charging application. The CC mode of charging is achieved using extended phase shift (EPS) modulation, and the CV mode of operation is implemented using dual phase shift (DPS) modulation techniques. The CV charging mode with DPS modulation technique is achieved using Model Predictive Control (MPC). The simulation of the DAB EV charging system is carried out in MATLAB/Simulink environment, and the observed results are discussed in detail.