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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,Orlan
2、do,FL32826,USAAbstract—Inthispaper,wedesignalowvoltageDC-DCconverterwithaflybacktransformer.TheconverterwillbeusedasabiasedpowersupplytodriveIGBTs.TheflybacktransformerusingplanarEI-coreisdesignedandsimulatedusingANSYSPExprtsoftware.Besides,anLT3574ICchipfromLinearTechnolo
3、gyhasbeenchosenforconvertercontrol.Finally,theconvertermodelingandsimulationarepresentedandPCBlayoutisdesigned.Keywords：Flyback,anLT3574IC,PCBI.INTRODUCTIONThegoalofthisprojectistodevelopandbuildaprototypeofahigh-efficiency,high-temperatureisolatedDC-DCconvertertobeusedasa
4、biasedpowersupplyfordrivingacomplementaryIGBTpair.Itisimportantthattheconvertercandelivertherequiredpoweratanambienttemperatureofupto100℃;thereforeithastobeefficientsothatitscomponentsdonotexceedtheirmaximumtemperatureratings.Thefinalconverterwillbecompletelysealedandpotte
5、dinametalcase.Theinputvoltagerangeforthisconverterisfrom9Vto36V.Theoutputsideshavetwoterminals,oneis﹢16Vandtheotheroneis﹣6V.Inordertogetthedesiredperformance,anLT3574ICchipfromLinearTechnologyisused.Thekeytothisdesignistheflybacktransformer.ThetransformerusingplanarEI-core
6、isdesignedandsimulatedusingANSYSPExprtsoftware.Finally,thePCBlayoutoftheconverterwillbepresented.16西安工程大学本科毕业设计（译文）I.KEYDESIGNOUTLINEForthisflybacktopology,theoutputvoltagecanbedeterminedbyboththetransformerturnsratioandtheflybackloopresistorpairs.Therefore,attheinitialdes
7、ignstage,wecanchooseaconvenientturn’sratioforthetransformer,andmodifyitlateronifnecessarytomakesuretheoutputperformanceisdesirableandthetransformerwillnotsaturate[1].TherelationshipbetweentransformersturnsratioanddutycyclecanbefoundasWherenisthetransformerturnsratio,Disthe
8、dutycycle,VO`isthesumoftheoutputvoltageplustherectifierdropvoltage,VINistheinputvoltageof
