Optimal Design of Sliding Mode Control Buck Converter with Bounded Input

In order to simplify the selection of sliding coefficient of conventional sliding mode control switch converter,the relations among the sliding region,the sliding coefficient and the circuit parameters of Buck converter are analyzed and discussed.when inductor current is zero,according to the relationship between the systems trajectory and sliding region,an optimal design method for the sliding coefficient was proposed to ensure that under load variation,the switch converter enter the sliding region without the output voltage oscillation phenomena.Based on load variation scope,the optimal sliding coefficient is calculated directly.The simulation and experimental results verify the validity and feasibility of the optimal design method proposed.