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1、120IEEETRANSACTIONSONPOWERELECTRONICS,VOL.31,NO.1,JANUARY2016CoupledInductorsinInterleavedMultiphaseThree-LevelDCDCConverterforHigh-PowerApplicationsSizhaoLu,StudentMember,IEEE,MingkaiMu,YangJiao,StudentMember,IEEE,FredC.Lee,LifeFellow,IEEE,andZhengmingZhao,SeniorMember,IEEEAbstra
2、ctThispaperinvestigatesandevaluatescoupledinduc-Inhigh-powerdcdcapplications,passivecomponentswilltors(CIs)intheinterleavedmultiphasethree-leveldcdccon-becomeoneofthemajorfactorsaffectingthesystemcost,vol-verter.Ifnon-CIsareusedinthemultiphasethree-leveldcdcume,andweight.Thethree-
3、leveldcdcconverterhasbeenpro-converter,interleavingoperationoftheconverterwillincreasein-ductorcurrentripple,althoughtheoveralloutputcurrentrippleposedforhighdcvoltageapplicationsbecauseoflowswitchandcommon-mode(CM)voltagewillbecomesmaller.Toreducevoltagestressandsmallpassivecompo
4、nentssize[4][6].Theinductorcurrentripple,inverse-CIsareemployed.Thecurrentthree-leveldcdcconverterhasthesameinputcurrentrip-rippleintheCIisanalyzedindetail.Thebenefitsofthethree-levelpleasthatofthetwo-interleavedtwo-levelconverter[4]butdcdcconverterwithCIsunderinterleavingoperation
5、areeval-hassmallerinductorcurrentripplecomparedwiththetwo-uated.ByaddingCIsandworkingunderinterleavingoperation,smallerinductorcurrentripple,smalleroveralloutputcurrentinterleavedtwo-levelconverter[6].Forhigh-currentapplica-ripple,andsmallerCMvoltagecanbeachievedsimultaneouslytion
6、s,convertersparallelingisasolutiontodealwithhighcomparedwiththenoninterleavingcase.Theanalysisresultsarecurrent.Whenconvertersareparalleled,interleavingoperationverifiedbysimulationsand10kWscale-downexperiments.couldbeappliedtoreduceinputandoutputpassivecomponentsIndexTermsCoupledi
7、nductor,dcdcconverter,highpower,sizeduetotheripplecancellationeffectoftheinterleaving.multiphasethreelevel.Thebenefitsofinterleavingforthetwo-levelconverterhavebeenanalyzedinmanypapers[7][12].Toreducetheinductorcurrentripple,coupledinductors(CIs)areintroducedtothein-I.INTRODUCTIONt
8、erleavedconverters[11][20],includ