Fuzzy Logic Based Sliding Mode Controlled For Active Clamp SEPIC Converter

In this paper a modified design of a sliding mode controller based on fuzzy logic for a soft switching sepic converter is introduced. Here a proportional integral (PI)-type current mode control is employed and a sliding mode controller is designed utilizing fuzzy algorithm. Sliding mode controller ensures robustness against all variations and fuzzy logic helps to reduce chattering phenomenon introduced by sliding controller. Therefore error, voltage and current ripples decrease. One of the advantages of proposed controller is better performance in comparison with conventional sliding mode controller in soft switching sepic converter The proposed system is simulated by MATLAB / SIMULINK. The simulation results verify the good performance of proposed controller against variation of input and reference voltages.