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基于Saber的200W双管反激变换器设计与仿真.docx

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基于Saber的200W双管反激变换器设计与仿真 Introduction Switchingpowersuppliesarewidelyusedinvariouselectronicdevicesastheyhaveseveraladvantagesoverlinearpowersuppliessuchashigherefficiencyandsmallersize.TheSabersimulationtoolallowsdesignerstocreateaccuratecircuitmodelsandsimulatethebehaviorofthecircuitunderdifferentconditionsbeforecreatingtheactualhardware.Inthispaper,wewilldiscussthedesignandsimulationofa200WflybackconverterusingSaber. Designconsiderations Thefirststepinthedesignprocessistodeterminethespecificationsofthepowersupply.Inthiscase,wearedesigninga200Wflybackconverterwitha48Vinputvoltageand12Voutputvoltage.Theswitchingfrequencyischosentobe100kHz.Theconvertertopologyisselectedbasedontherequiredspecifications. Thenextstepistoselectthecomponentsforthecircuit.Theflybackconverterconsistsofatransformer,twoMOSFETs,adiode,andacapacitor.Thetransformerisselectedtomeettherequiredvoltageandpowerspecifications.TheMOSFETsareselectedbasedontherequiredvoltagerating,currentrating,andon-stateresistance.Thediodeisselectedbasedonthereversevoltageratingandforwardcurrentrating.Thecapacitorisselectedbasedonitsvoltageratingandcapacitancevalue. Circuitsimulation Afterselectingthecomponents,thecircuitisdesignedinSaber.Thecircuitistestedandanalyzedforitssteady-stateperformance.Thestartupbehavioristestedbyapplyingtheinputvoltagewaveformatt=0. Thefirstsimulationisdonewithidealcomponentstoobtainthebasicbehaviorofthecircuit.Thesimulationsarerunfordifferentloadconditionstoensurethatthecircuitoperationremainsstablethroughoutthedesiredrangeofloadconditions. Oncethebasicbehaviorofthecircuitisverified,parasiticcomponentssuchasstrayinductanceandresistanceareaddedtothecircuitmodel.Thecircuitisagainsimulatedtoobtainamorerealisticbehaviorofthecircuitunderdifferentloadconditions. Results Thesimulationresultsofthedesignedflybackconverterdemonstratethatthecircuitoperatesefficientlyandstablyunderdifferentloadconditions.Theoutputvoltageisregulatedto12Vwithlessthan2%ripplevariation.Theefficiencyoftheconverterisgreate