Dynamic sliding mode control-based rapid voltage regulation method for step-down direct-current converter

The invention provides a step-down DC converter rapid voltage regulation method based on dynamic sliding mode control. The method comprises the following steps: step 1, constructing a DC-DC step-down converter model with parameter perturbation; 2, establishing a tracking error system, and introducing an auxiliary variable to obtain new to-be-designed control input; 3, constructing a dynamic equation of the interference observer according to the tracking error system; and step 4, designing a sliding mode surface, a dynamic sliding mode controller and an adaptive law of estimation parameters based on a tracking error system, and realizing rapid voltage regulation. According to the invention, a new linear sliding mode surface is designed, and rapid convergence of voltage and current errors of a DC-DC buck converter system is realized. According to the structure of an observer and a sliding mode surface, a novel adaptive dynamic sliding mode controller is designed by using an exponent plus power reaching law, the