Sliding Mode Control Based on Super Twisting Algorithm for Single-Stage On-Board Charger

This paper presents a super-twisting algorithm-based sliding mode control (STA-SMC) method for a single-stage on-board charger (OBC). Constant current (CC) and constant voltage (CV) charging modes are determined by a simple algorithm that works depending on the battery’s state of charge (SOC) level. Based on the mode detection algorithm, a proportional-integral (PI) controller is used to generate the amplitude of the inductor current reference that is identical to the grid current’s amplitude. The inductor current is controlled by the proposed STA-SMC method. Simulation studies are carried out through the MATLAB/Simulink environment. The results reveal that the proposed control method successfully regulates battery voltage or current and grid current under dynamic and steady-state conditions. Furthermore, the proposed method exhibits a smooth transition from CC to CV modes and vice versa. Also, the spectrums of grid current show that the total harmonic distortion in grid current is under the recognized limits by the standards.