Adaptive, stable fuzzy logic control for paralleled DC-DC converters current sharing

This paper introduces a unified, theoretical, approach for the analysis and design of stable, fuzzy logic controllers for Master-Slave (MS) paralleled DC/DC converters current sharing. Because of high system complexity, the present small signal designs are unable to give a good response for large load changes and line transients. Fuzzy logic, by dealing naturally with nonlinearities, offers a good, parameter insensitive large signal controller type. Current sharing control is formulated as a tracking problem and stability is ensured through adaptation or supervisory control on a Lyapunov trajectory. Simulated results are shown in a comparative study with a classical linear, Op-Amp, controller and respectively with a PID controller.