Application of state space averaging method to sliding mode control of PWM DC/DC converters

A novel approach for the analysis and design of sliding mode controllers for PWM DC/DC power converters is presented. The main advantage of this nonlinear controller is that there is no restriction on the size of the signal variations around the operating point. Small as well as large signal variations around the operating point are considered. Sliding mode controllers for buck, boost, buck-boost, and Cuk power converters have been designed and discussed. These controllers have been simulated on a digital computer and their dynamic performances have been shown to be satisfactory. Finally, Lyapunov's second theorem has been used to verify the stability of the designed sliding mode controller for the Cuk power converter.