Design and analysis of fuzzy logic based robust PID controller for PWM-based switching converter

This paper presents the design and construction of a fuzzy logic based PID controller for the control of a PWM-based dc-dc buck converter working in Continuous Conduction Mode (CCM). The converter operates at a switching frequency of 500 KHz. Fuzzy Logic Toolbox from MATLAB/SIMULINK is used to fuzzify the inputs and their membership functions, express the inference rules linking the input and output variables and defuzzify the output parameter. Generally this approach expresses the advantage of simplicity as no linearized model of the buck converter is required. The simulation results from MATLAB/SIMULINK show that the fuzzy logic based PID control technique provides robust control for non-linear power electronics variable switching structure like the dc-dc buck converter and validates the design.