Robust Sliding Mode Controller Design for Practical Buck Converter Using Initial Conditions Based Approach

The performance analysis of sliding mode controlled dc-dc converters with R-load has already been well studied and documented. A practical converter will have a load combination of resistance and inductance (RL). The presence of the inductor will result in large transients which, if not controlled may be detrimental to the integrated circuits. In this paper, the initial conditions based sliding mode controller (ICSMC) design is applied to a practical buck converter having RL combination as load. The proposed design is capable of controlling the relative damping ratio through appropriate choice of the sliding coefficients, whereby it is possible to control the transients. The results of simulation obtained for one set of initial conditions are reported in this paper. The results show that the load robustness property of ICSMC is preserved for the RL combination of load. The method also ensures line robustness.