Improved large signal performance of paralleled DC-DC converters current sharing using fuzzy logic control

Abstract

This paper introduces fuzzy logic control as a technique for significantly improving the large signal performance of paralleled DC-DC power converters with master-slave current sharing control. The control design for such systems is challenged by its high modeling complexity and present approaches come only from a small signal perspective, unable to give a good response for wide load and line transients. The fuzzy logic approach, by dealing naturally with nonlinearities, offers a good and parameter insensitive transient response for the current sharing loop. Design methodology of the fuzzy compensator, simulation results and a comparison with existing classical designs is shown.