Design and Implementation of Intelligent Control of a Fly back Quasi Resonant Converter

Power supply voltages in digital systems have beenreduced considerably in recent years and often digital componentsrequiring different voltages are present in the same board. Thishas increased the demand for multiple output power distributionsystems with tight load regulation. In this paper, a detailedanalysis and design of a multi-output flyback zero voltageswitching (ZVS) quasi resonant converter(QRC) has been carriedout. The effect of cross regulation due to load resistances andleakage inductances are studied and obtained. To reduce theeffect of cross-regulation, conventional PI controllers aredesigned and simulated. In order to improve the performances ofthe converter due to nonlinearity, intelligent controller like fuzzylogic controller is proposed and simulated. The output results forload regulations are presented and the performances of both thecontrollers are compared. The result reveals that fuzzy logiccontroller gives satisfactory performances.