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1、西安工程大学本科毕业设计（译文）LowVoltageFlybackDC-DCConverterForPowerSupplyApplicationsHangzhouLiu1,JohnElmes2,KejiuZhang1,ThomasX.Wu1,IssaBatarseh1DepartmentofElectricalEngineeringandComputerScience,UniversityofCentralFlorida,Orlando,FL32816,USAAdvancedPowerElectronicsCorporati
2、on,Orlando,FL32826,USAAbstract—Inthispaper,wedesignalowvoltageDC-DCconverterwithaflybacktransformer.TheconverterwillbeusedasabiasedpowersupplytodriveIGBTs.TheflybacktransformerusingplanarEI-coreisdesignedandsimulatedusingANSYSPExprtsoftware.Besides,anLT3574ICchipfr
3、omLinearTechnologyhasbeenchosenforconvertercontrol.Finally,theconvertermodelingandsimulationarepresentedandPCBlayoutisdesigned.Keywords：Flyback,anLT3574IC,PCBI.INTRODUCTIONThegoalofthisprojectistodevelopandbuildaprototypeofahigh-efficiency,high-temperatureisolatedD
4、C-DCconvertertobeusedasabiasedpowersupplyfordrivingacomplementaryIGBTpair.Itisimportantthattheconvertercandelivertherequiredpoweratanambienttemperatureofupto100℃;thereforeithastobeefficientsothatitscomponentsdonotexceedtheirmaximumtemperatureratings.Thefinalconvert
5、erwillbecompletelysealedandpottedinametalcase.Theinputvoltagerangeforthisconverterisfrom9Vto36V.Theoutputsideshavetwoterminals,oneis﹢16Vandtheotheroneis﹣6V.Inordertogetthedesiredperformance,anLT3574ICchipfromLinearTechnologyisused.Thekeytothisdesignistheflybacktran
6、sformer.ThetransformerusingplanarEI-coreisdesignedandsimulatedusingANSYSPExprtsoftware.Finally,thePCBlayoutoftheconverterwillbepresented.16西安工程大学本科毕业设计（译文）I.KEYDESIGNOUTLINEForthisflybacktopology,theoutputvoltagecanbedeterminedbyboththetransformerturnsratioandthefl
7、ybackloopresistorpairs.Therefore,attheinitialdesignstage,wecanchooseaconvenientturn’sratioforthetransformer,andmodifyitlateronifnecessarytomakesuretheoutputperformanceisdesirableandthetransformerwillnotsaturate[1].Therelationshipbetweentransformersturnsratioandduty
8、cyclecanbefoundasWherenisthetransformerturnsratio,Disthedutycycle,VO`isthesumoftheoutputvoltageplustherectifierdropvoltage,VINistheinputvoltageof
