Design and analysis of fuzzy controllers for DC-DC converters

A successful implementation of fuzzy controllers for DC-DC converters is presented in this paper. Two different fuzzy logic control topologies are developed and implemented using different types of DC-DC converters such as the buck, the boost, the buck-boost, and the sepic converters. Issues of sudden changes in the load or parametric uncertainties control and communication interface, among many other issues, are discussed and presented. The fundamentals governing the design, control and performance of the DC-DC converters are also illustrated. Properties of the proposed controllers are: 1) robustness around the operating point, 2) good performance of transient responses under varying loading conditions and/or input voltage, and 3) invariant dynamic performance in the presence of varying operating conditions. Simulation results have been obtained using appropriate scaling factors associated with the input variables of the fuzzy controller.