8967

8312

كارشناسي ارشد

قدرت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1392

[شش]، 101ص: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمد مدني، محمد ابراهيمي

12/3/93

حميدرضا كارشناس، احسان اديب

مهندسي برق و كامپيوتر

ID8312

New Power Factor correction PFC Converter Hadi aran H aran@ec iut ac ir Date of Submission 2012 02 29 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Seyed Mohammad Madani madani104@yahoomail com Mohammad EbrahimiAbstractDue to ever increasing demand for dc dc converters using rectifiers is unavoidable Conventional rectifiersencounter excessive peak input current and total harmonic distortion THD which reduces power factor PF to about 0 5 0 7 In order to increase PF PF correction PFC converters are employed to decreasethese harmonics A conventional form of a PFC converter which is usually controlled by averagecurrentpulsewidth modulation PWM method is a full bridge rectifier followed by a boost converter It is desiredto reduce the volume and weight of a converter by increasing the switching frequency Increasing theswitching frequency would result in higher switching losses which make employing soft switchingtechniques unavoidable Consequently dc dc power supplies with higher power density and improvedefficiency can be obtained Many ac dc topologies are introduced to improve the efficiency and PFsimultaneously In order to improve efficiency switching losses and conduction losses should be reduced To reduce conduction losses the rectifier circuit and the PFC are combined to create bridgeless PFC This

محمد مدني، محمد ابراهيمي

حميدرضا كارشناس، احسان اديب