A Buck Converter-based Battery Charging Controller for Electric Vehicles using Modified PI Control System

A well functioned battery charger for electric vehicles can improve the life cycle of the battery. To control the overshoot, rise time and settling time with respect to the changing input voltage and load is the noticeable challenge in the field of battery charging. Usually, a PID controller has been used to overcome these challenges. However, PID controller is suitable for a specific configuration, and overshoot, oscillation happens when input voltage and load vary. In this paper, a buck converter-based battery charging controller is presented in which a modified proportional-integral (PI) controller is used. The modified PI controller is tuned for charging the battery with minimum overshoot and settling time. To verify the viability, the proposed system has been simulated in MATLAB. The simulation results show that the overshoot is reduced to 1.23% with the settling time of 0.01s for the 48V battery bank.