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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,USAAdvancedPowerElectronicsCorporation,Orlando,FL32826,USAAbs
2、tract—Inthispaper,wedesignalowvoltageDC-DCconverterwithaflybacktransformer.TheconverterwillbeusedasabiasedpowersupplytodriveIGBTs.TheflybacktransformerusingplanarEI-coreisdesignedandsimulatedusingANSYSPExprtsoftware.Besides,anLT3574ICchipfromLinearTechnologyhasbeenchosenforconvertercontrol
3、.Finally,theconvertermodelingandsimulationarepresentedandPCBlayoutisdesigned.Keywords：Flyback,anLT3574IC,PCBI.INTRODUCTIONThegoalofthisprojectistodevelopandbuildaprototypeofahigh-efficiency,high-temperatureisolatedDC-DCconvertertobeusedasabiasedpowersupplyfordrivingacomplementaryIGBTpair.I
4、tisimportantthattheconvertercandelivertherequiredpoweratanambienttemperatureofupto100℃;thereforeithastobeefficientsothatitscomponentsdonotexceedtheirmaximumtemperatureratings.Thefinalconverterwillbecompletelysealedandpottedinametalcase.Theinputvoltagerangeforthisconverterisfrom9Vto36V.Theo
5、utputsideshavetwoterminals,oneis﹢16Vandtheotheroneis﹣6V.Inordertogetthedesiredperformance,anLT3574ICchipfromLinearTechnologyisused.Thekeytothisdesignistheflybacktransformer.ThetransformerusingplanarEI-coreisdesignedandsimulatedusingANSYSPExprtsoftware.Finally,thePCBlayoutoftheconverterwill
6、bepresented.16西安工程大学本科毕业设计（译文）I.KEYDESIGNOUTLINEForthisflybacktopology,theoutputvoltagecanbedeterminedbyboththetransformerturnsratioandtheflybackloopresistorpairs.Therefore,attheinitialdesignstage,wecanchooseaconvenientturn’sratioforthetransformer,andmodifyitlateronifnecessarytomakesurethe
7、outputperformanceisdesirableandthetransformerwillnotsaturate[1].TherelationshipbetweentransformersturnsratioanddutycyclecanbefoundasWherenisthetransformerturnsratio,Disthedutycycle,VO`isthesumoftheoutputvoltageplustherectifierdropvoltage,VINistheinputvoltageof
