3534

3340

كارشناسي ارشد

الكترونيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1385

هشت، 132، [II]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

حسين فرزانه فرد

حميدرضا كارشناس

20/3/86

مهندسي برق و كامپيوتر

ID3340

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Abstract Due to ever increasing demand for processing in smaller space high frequency powerconversion is needed At high frequency semiconductor devices are subjected to highswitching loss and increased electromagnetic interference EMI Soft switching techniquesare proper solutions to decrease switching losses and EMI The simplest method to obtain softswitching is to employ lossy snubbers However they fail to increase the total efficiency Resonant and quasi resonant converters are another method but in these converters the switchvoltage and current stresses increase and also the control system is complex Since 1994 ZVT ZCT and ZCZVT converters are suggested In these converters the switch voltage and currentstresses do not increase and also the control system is simple In this thesis variousconventional ZVT ZCT and ZCZVT converters are discussed and new family of ZVT andZCT converters are proposed In addition by combining ZVT and ZCT converters a newfamily of ZCZVT converters is introduced Finally a new method to create a family ofisolated ZVT converters is proposed In each section one of the proposed converters isanalyzed and theoretical analysis is justified with experimental results At the end conclusionsand suggestions are presented

حسين فرزانه فرد

حميدرضا كارشناس