The sliding mode controller design for buck converter fed by AC-DC power systems

The proportional-integral (PI) controllers are widely used in many applications. However, the system performance is occasionally undesired. The slowly dynamic response, the signal oscillation, and the vulnerability to disturbances can occur when the PI controller is applied. Therefore, this article presents the sliding mode controller (SMC) design for buck converter fed by AC-DC power systems. The SMC is considered because of its merit including the rapid dynamic response and robustness. The design process is based on a trial and error method. The intensive time-domain simulation using SimPowerSystemTM on MATLAB and the experimental rig built in the laboratory are used for the controller performance comparison between the SMC and PI controllers. The results show that the SMC can provide the system responses better than the PI controller in terms of rise time, settling time, undershoot, and overshoot.