A robust second order sliding mode controller for Buck converter

A robust second order sliding mode control is used for Buck converter. After building the model of Buck circuit, the Twisting Algorithm is designed, which is based on relative degree of sliding mode control. The second order sliding mode not only reserves advantages of traditional sliding mode: robustness, but also eliminates the chattering problem. By comparing PID control with second order sliding mode control, simulation results indicate that second order sliding mode control have stronger robustness despite load disturbance.