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1、Steady-StateAnalysisoftheLLCSeriesResonantConverterJamesF.LazarRobertMartinelliBraxtonEngineering,Inc.ArtesynTechnologies28VistaMarDrive5252BolsaAvenueLagunaNiguel,CA92677HuntingtonBeach,CA92649-1019E-mail:jimlazar@ftel.netE-mail:rob.martinelli@artesyn.c
2、om(949)249-2197(714)899-6800ext.201Abstract-TheoperatingmodesoftheLLCseriesresonantconverterareD1analyzedtodeterminethesteady-stateoperatingpointandmodeQ1C/2Ln:1:1boundaries.Thethree-elementLLCseriesresonantconverteris+Vorealizedbyaddinganinductortotheba
3、sictwo-elementseriesresonant_convertertopology.Unlikethetwo-elementseriesresonantconverter,VgLMwhichislimitedstrictlytostep-downoperation,theLLCconverteriscapableofbothstep-upandstep-down.AwiderangeofoutputpowerisQ2C/2controlledwithonlyanarrowvariationin
4、operatingfrequency.Inaddition,zero-voltageswitchingcanbeachievedovertheentireD2operatingrange.AllofthesedesirablepropertiesareobtainedFigure1:Half-BridgerealizationoftheLLCseriesresonantconverter.essentiallyforfree,astheadditionalresonantinductorcanberea
5、lizedInthispaper,adetailedanalysisisgivencoveringabroadsimplybyintroducinganairgaptothemainpowertransformer.operatingrange.ItisfoundthatthebuckandboostmodesI.INTRODUCTIONpossessdifferentsetsofsteady-stateoperatingmodes,andthesecasesarelookedatseparately.
6、AboveandbelowWhiletheadvantagesofresonantpowerconvertersresonanceoperationisdiscussedforeachcase.Normalizedincludehighefficiencyandlownoise,theseriesresonantpowercurvesarecalculated,andtheseprovideforasimpleconvertersuffersfromseveraldrawbacksthatlimitit
7、sdesignprocedure.Theresultisalowcost,highefficiencyusefulnessinmanyapplications.First,theconverteristopology.Experimentalresultsverifytheseclaims.theoreticallyincapableofregulatingwhenunloaded.Second,awidevariationoffrequencyisnecessarytoprovideII.ANALYS
8、ISregulationoverevenamoderateloadrange.Third,atlightOperationoftheLLC-SRCismuchlikethatofthebasicloads,theresonantcurrentisreducedtoapointwherezero-two-elementSRC.Switchesarecontrolledincomplementaryvoltageswitching(ZVS)is
