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1、OptimalDesignMethodologyforLLCResonantConverterBingLu,WenduoLiu,YanLiang,FredC.Lee,JacobusD.vanWykCenterforPowerElectronicsSystemsVirginiaPolytechnicInstituteandStateUniversity674WhittemoreHallBlacksburg,VA24061USAAbstract:AlthoughLLCresonantconvertercanachievewideconverterbecomesthemostattrac
2、tivetopologyduetoitshighoperationrangewithhighefficiency,lackofdesignmethodologyefficiencyandwideoperationrange.makesitdifficulttobeimplemented.Inthispaper,basedonthetheoreticalanalysisontheoperationprinciplesduringnormalconditionandholduptime,therelationshipbetweenconverterefficiencyandoperat
3、ionrangewithdifferentcircuitparametersCrLrn:1:1Vohasberevealed.AnoptimaldesignmethodologyhasbeenVindevelopedbasedontherevealedrelationship.A1MHz,1kWLmLLCconverterisdesignedtoverifytheproposedmethod.RLI.INTRODUCTIONWiththedevelopmentofpowerconversiontechnology,powerdensitybecomesthemajorchallen
4、geforfront-endFigure2.LLCResonantConverter.AC/DCconverters[1][2][3].Althoughincreasingswitchingfrequencycandramaticallyreducethepassivecomponent2size,itseffectivenessislimitedbytheconverterefficiencyandQ=0.3thermalmanagementdesign.Meanwhile,tomeettheholduptimerequirement,bulkycapacitorshavetob
5、eusedtoprovideZCStheenergyduringholduptime,whichisonlyaffectedby1.5nVo/(Vin/2)DC/DCstageoperationinputvoltagerange[1].TheZVSrelationshipbetweenholduptimecapacitorrequirementandminimumDC/DCstageinputvoltagefordifferentfront-end1converterpowerlevelsisshowninFigure1.Apparently,wideQ=1operationran
6、geDC/DCstagecanreducetheholduptimecapacitorrequirementandimprovethesystempowerdensity.However,whentheminimumvoltageislessthan200V,very0.5limitedeffectscanbeobserved.0.20.40.60.811.21.4f/f0Figure3.GainCharacteristicofLLCConverter.TheLLCresonantconvertertopologyisshowninFigure2.Byutilizingthetra
7、nsformermagnetizinginductance,LLCconvertermodifiesthegaincharacteristicofseriesresonantconverter(SRC).ItsvoltagegaincharacteristicsfordifferentloadsareshowninFigure3,duetothehalfbridgestructure,theoutputvoltageisnormalizedwithhalfofthei
