Improved large-signal performance of paralleled DC-DC converters current sharing

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 which 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. The design methodology of the fuzzy compensator, simulation results, and a comparison with existing classical designs are shown.