A Three-Phase Totem-Pole AC-DC Converter Based Off-Board Charger for Electric Vehicles

This paper presents the design, implementation, and performance evaluation of a three-phase bridgeless totem-pole off-board charger specifically developed for electric vehicles (EVs). The charger is characterized by a modular architecture that allows for scalability, consisting of three single-phase parallel bridgeless totem-pole AC-DC converters, each capable of supplying one-third of the total rated power. The control system of the charger employs three cascaded control loops to ensure stable operation and facilitate a seamless transition from current control mode to voltage control mode throughout the battery charging process, accommodating a wide range of EV battery configurations. Furthermore, the charger is engineered to support and improve grid power quality, ensuring a sinusoidal grid current waveform and unity power factor, thereby enhancing efficient power transfer while minimizing grid disturbances. The performance of this level ‘3’ charger was assessed and validated through MATLAB/Simulink simulations, with testing conducted on battery bank voltages of 400V, 800V, and lOOOV for three electric vehicles.