Application of a robust fuzzy logic controller with smaller rule base to a DC-DC buck converter

Abstract

Fuzzy logic based controller is usually employed to control the complex and ambigious plants. In this paper we propose the design and construction of a fuzzy logic controller (FLC) having reduced number of rules to control DC-DC buck converter operating in continuous conduction mode (CCM). A Proportional-Derivative (PD) controller on the basis of fuzzy logic is constucted using the MATLAB/Simulink environement. It is then compared performance wise to the modified and improved version of classical PD controller, i.e. , Proportional-Derivative with Derivative-on-Output (PD-DOO) controller. The PD-DOO controller even further improves the output voltage performance characteristics like percent overshoot, settling time, etc. offered by the PD controller. The MATLAB/Simulink simulation results reveal that the proposed FLC with smaller rule base not only exhibits improved load and line regulations but also shows better set-point tracking.