Design of Global Sliding Mode Control Buck Converter With Hysteresis Modulation

The relation between transient performance and global sliding coefficients of Buck converter was studied. The design of sliding-mode moving coefficients was analyzed and the implementation of global switching function was proposed. The output voltage ripple of Buck converter was analyzed and determination of transient operation status was given. The global sliding mode controller was realized in Matlab/Simulink. Simulation and experimental results verify the validity of the proposed methods for the determination of transient operation status,the evaluation of transient initial value and the design rule of global sliding coefficients. Compared with conventional sliding mode control,the proposed global sliding mode control has similar load transient performance and better Robustness