Abstract
This paper proposes a Sliding Mode Controller to improve the dynamic performance of buck converter. Proposed controller comprises of a linear part and a nonlinear part. Linear and non-linear parts of the controller consist of PID and hysteresis control respectively. PID controller is applied to the output voltage loop of buck converter and hysteresis control is implemented through inductor current ripple, which is used to select ON and OFF points of the hysteresis control. Proposed controller for buck converter is simulated using MATLAB®/SIMULINK® software. Simulation analysis shows improved response with proposed SMC. Little and no overshoot in output voltage and inductor current is observed respectively for initial transient, however settling time is drastically improved and there is negligible overshoot in output voltage during line and load variation. Keywords: Buck Converter, Line and Load Variation, Sliding Mode Controller, Transient Response
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