VSS approach to a full bridge buck converter used for AC sine voltage generation

The authors present an application of variable structure systems (VSS) theory, and the associated sliding mode, to a full bridge buck converter used to produce an AC sine voltage. To design a sliding mode controller, the pole assignment method is used. The equivalent control method makes it possible to determine the existence of the sliding regime in the state space. A pulse-width-modulated (PWM) control technique method makes possible AC sine voltage generation. Under high-frequency control switchings, there is an ideal equivalence among sliding mode control and PWM. Experimental results for both of these methods show that under a fixed high switching frequency, the equivalent control corresponding to a sliding motion coincides with the duty ratio of the PWM technique