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1、1776IEEETRANSACTIONSONPOWERELECTRONICS,VOL.24,NO.7,JULY2009WidebandCurrentTransducerforMeasuringACSignalsWithLimitedDCOffsetMichaelHartmann,StudentMember,IEEE,JuergenBiela,Member,IEEE,HansErtl,Member,IEEE,andJohannW.Kolar,SeniorMember,IEEEAbstract—Inmanyapplications,acurrentmeasurementthatca
2、nmeasureaccurrentswithdcoffsetisrequired.Thisisnotpossibleusingconventionalcurrenttransformers(CTs)duetothecoresaturationbecauseofthedcoffset.Inthispaper,anewsen-sorconceptispresented,whichconsistsofawidebandCTandademagnetizingcircuit.Thesensorconceptiscapableofmeasuringaccurrentswithdcoffse
3、t,whichhaveperiodiczerocrossings,asgiveninpower-factor-corrected(PFC)circuits.Usingthedemag-netizationcircuit,thecoreisactivelyresetduringthezerocrossingintervals.Theoperationprincipleanddesignequationsaredis-cussedindetailinthispaper.Forvalidatingthepresentedconcept,Fig.1.AC/DCconverterwith
4、sinusoidallycontrolledinputcurrents.Inorderthreesensorshavebeenbuiltusingdifferentcorematerials,andtoguaranteedc-freeinputcurrents,acurrentsensorthatcanmeasuretheacandmeasurementsofthetransferfunctionsaswellasoperationinadccomponentsoftheinputcurrenthastobeused.PFCsystemarepresented.Abandwid
5、thfromdcupto20MHzhasbeenachieved.IndexTerms—Currentmeasurement,currenttransformer(CT),nanocrystallinematerial.I.INTRODUCTIONNINCREASINGnumberofpowerelectronicsystemsAconnectedtothepowergrid,suchasinputstagesoftele-compowersupplies[1],[2],front-endsystemsofdrives[3],orpowerelectronicsforrenew
6、ableenergysources[4],[5],areFig.2.Classificationofisolatedcurrentmeasurementprinciples.realizedwithactiverectifiercircuittopologies.Inordertomin-imizetheinfluenceonthemains,sinusoidalinputcurrentsandThegeneraltrendforhigherpowerdensitiesisdrivenbycostaunitypowerfactorarerequired.Acurrentcontrol
7、lerisusedtoreduction,anincreasedfunctionality,andlimitedweight/space,achievetheserequirements,forwhichtheinputcurrentsmustinsomeapplications(e.g.,automotiveandaircraft)[6].Thisbemeasured(cf.,Fig.1).Additionally,asuperimposedvolt-finallyresultsincons
