National Natural Science Foundation of China (No.51177140);Program supported by Research Fund of Chengdu University of Information Technology (No.KYTZ201126)
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.