Interaction Between Magamp & transformer

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1、AnalysisandSolutionsoftheInteractionProblemsBetweenTransformerPrimarySnubbersandSaturableReactorsinaMagampSwitchingPowerSupplyCliffordJamersonXiaodongZhan*andDanChenConsultantCenterforPowerElectronicsSystems60NancyCourtTheBradleyDept.ofElectricalandComputerEngineering

2、Christiansburg,VA24073USAVirginiaPolytechnicInstitute&StateUniversityBlacksburg,VA24061USAAbstractWiththeuseofmagamppostregulatorsonallFig.1isablockdiagramfortypicalPFC5v/3.3v/12voutputsofamultiple-outputforwardconverterpowersupply,forwardconverterwiththreemagamppost

3、regulators.ThethereisaninteractionbetweentheprimarysnubbercircuitandPWMhasfeed-forwardcontrolbutthereisnovoltagetheresetofthesaturablereactors.ThisoftenleadstohigherfeedbackforPWMregulationfromanyofthreeoutputs.lossesinthetransformerandthesaturablereactorsthanIthasbee

4、ncommonknowledgeintheindustrythatonenecessaryandinsomecases,lossofoutputregulation.Thecannotputmagampsonalloutputsofahalf-bridge,fullnatureoftheinteractionandmethodsforsolvingtheinteractionproblemsarediscussedinthispaper.bridge,orpush-pullconverterunlessoneaddressesas

5、eriousproblem,namelyprovidingapathforthetransformer’sI.INTRODUCTIONmagnetizingcurrentbetweenpulses[1].Assumingthereisonenon-magampoutputthathascontinuouschokecurrentWiththedevelopmentofcomputer,networkandandahighenoughminimumload,thenthemagnetizingtelecommunicationdev

6、ices,oftenthepowersupplyiscurrentofthetransformerbetweenpulsesmigratestotherequiredtohavemultipleoutputswithanyorallofthesecondaryandunbalancesthecurrentsinthetwolegsoftheoutputshavingverysmallminimumloads.Twocommontransformerwindingforthatoutput.Themagnetizingcurrent

7、approachesare1)useofmultipleinvertersandtransformers,betweenpulsescannotgointoanyofthesecondarymagamponeforeachoutput,and2)usingadown-switchertodrivetheoutputs[1].IfthecurrentinthemainPWMoutputistoolowlowervoltageoutputsfromhighestvoltageoutput.Athirdtoacceptthemagnet

8、izingcurrent,thentoavoidhavingaapproachisusingasingleinverterandtransformerandputaportionofthemagnetizingcurrentjumpbackinto