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1、NovelCapacitor-IsolatedPowerConverterJingpengZhu，MingXu，JuluSun,ChuanyunWangFSP-PowerlandTechnologyInc.,Nanjing,P.R.China,210042jingpengzhu@fsp-powerland.comAbstract--ThispaperpresentedanovelpowerconversionTolimitTCandmeettheprimarytosecondaryclearancemethodofrealizingthegalvanicisolationbydual
2、safetyrequirements,isolationisneeded.Currently,mostofthecapacitors(Y-cap)insteadofconventionaltransformer.Withprimary-secondaryisolationisrealizedbyusingtransformerslimitedcapacitanceoftheYcapacitor,seriesresonantisasshowninFig.2.SincethestraycapacitanceCissmallandproposedtoachievethepowertrans
3、fer.Thebasicconceptistocontrolthepowerpathimpedance,whichblocksthedominanttheACmainsfrequencyislow,ICissmallenoughtomeetlow-frequencypartoftouchcurrentandletthehigh-frequencyTClimitation.However,theconventionalisolationpowerflowfreely.Conceptualanalysis,simulationanddesigntransformerisalwayslar
4、geinsizeandheight,andhaspoorconsiderationsarementionedinthispaper.An85WAC/AClightloadefficiency.Thishasbecomeabottleneckfortheprototypeisdesignedandverifiedtosubstitutetheisolationfurtherimprovementoftheisolatedconverters,suchasthetransformerofaCCFLLCDTVbacklightsystem.ComparedpowersuppliesforL
5、CDTVbacklight.Onealternativeisthewiththeconventionaltransformerisolation,thenewmethodispiezoelectrictransformer.However,itsapplicationisgreatlyprovedtomeetthefunctionandsafetyrequirementsofitsspecificationwhilehashigherefficiencyandsmallersize.limitedbythedrawbackslikecomplicatedincontrol,sensi
6、tivetotemperatureandsoon.IndexTerms--Touchcurrent,leakagecurrent,isolation,safetycapacitor,resonance.I.INTRODUCTIONTheTouchCurrent(TC)istheelectriccurrentthroughhumanbodywhileonetouchestheaccessibleconductivepartsofapieceofequipment[1].Toguaranteethesafety,IEC60990hasstandardizedthemeasuringmet
7、hodsofTC,Fig.2.Illustrativediagramofelectricalshock[4].oneofwhichisshowninFig.1a.Inthismethod,theuserisapproximatedbyameasuringnetwork(Fig.1bfore.g.).Ifthevoltage(U2,namelyVTC_test)detectedonthemeasuringnetworkexceedsthecorrespond
