Comparative Analysis of Performance of the SEPIC Converter Using PID and Fuzzy Logic Controllers for LED Lighting Applications

34 Abstract— This paper presents an analysis of the dynamic performance on DC-DC SEPIC (Single Ended Primary Inductor Converter) converter which is operating in continuous conduction mode (CCM) with PID and fuzzy logic controller implementation. The operational analysis and design is done for 20W load. SEPIC converter is a suitable converter when the input voltage has got wide variations around the rated voltage. One of the applications in which source side variations are wide is LED lighting fed by battery which is charged from PV systems present in street lighting in rural areas. Similarly, the other application is LED lamps fed by AC source considering universal input range. Therefore, importance is given to source side disturbance of SEPIC converter. Hence in this paper, a PID controller and fuzzy logic controller have been implemented to improve the dynamic and steady state performance of the SEPIC converter when source voltage is subjected to wide variations keeping the output voltage at a constant value at steady state. Simulation results have been obtained using MATLAB/SIMULINK. The percentage overshoot, rise time and settling time have been compared and analyzed.