Topology and performance investigation of fuzzy controlled resonant converter for constant current source

Abstract

DC to DC converters play an important role in many industrial, medical and domestic appliances. Some of the commonly available forms of electrical power are the standard 230 V 50Hz utility, the DC voltage output of the battery, photovoltaic panels and fuel cell. Besides in the case of PMSG used with wind turbine there is a front end three phase rectifier followed by DC to DC converter. Thus the usage of the DC to DC power electronic converter is inevitable. The isolated DC to DC converters enjoy the benefit of being isolated in the sense that there is a galvanic isolation between the source side and the load side. This feature is necessary in certain applications especially in hand held or table top domestic applications. In the case of isolated DC to DC converters there is an AC link in between the source and the load sides and invariably a transformer is used. Using a transformer for the AC link increases the size and weight of the converter. In order that the size and weight of the converter be brought down a high frequency is used in the AC link. Using a high frequency AC link increases the power density and the size and weight of the converter is drastically reduced. Besides if the phenomenon of resonance is used then the additional advantages like the zero voltage switching and zero current switching can be utilized, which contribute for the increased power conversion efficiency by way of reducing the switching losses. newline