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1、CommonModeEMIReductionTechniqueforInterleavedMHzCriticalModePFCConverterwithCoupledInductorYuchenYang,MingkaiMu,ZhengyangLiu,FredC.LeeandQiangLiCenterforPowerElectronicsSystemsTheBradleyDepartmentofElectricalandComputerEngineeringVirginiaTech,Blacksburg
2、,VA24061USAycyang@vt.eduAbstract—CoupledinductorhasbeenwidelyadoptedinVRapplicationsformanyyearsbecauseofitsbenefitssuchasreducingcurrentrippleandimprovingtransientperformance.Inthispresentation,coupledinductorconceptisappliedtointerleavedMHztotem-poleC
3、RMPFCconverterwithGaNdevices.ThecoupledinductorinCRMPFCconvertercanreduceswitchingfrequencyvariation,helpachievingZVSandreducecirculatingenergy.ThereforethecoupledinductorcanimprovetheefficiencyofPFCconverter.Inaddition,balancetechniqueisappliedtohelpmi
4、nimizeCMnoise.ThispaperwillFig.1Switchingfrequencyvariationduringhalflineintroducehowtoachievebalancewithcoupledinductor.ThecyclenovelPCBwindinginductordesignwillbeprovided.ThePCBwindingcoupledinductorwillhavesimilarlosswithlitzwirerecoveryisnotaproblem
5、anymore.Hence,totem-polePFCinductorbutmuchlesslaborinmanufacture.converterisbecomingmoreandmorepopular.I.INTRODUCTIONHowever,theCRMtotem-polePFCconverterhasitsownlimitations.Thefirstoneislargevariationofswitchingfrequency.TheoperationprincipleofCRMPFCco
6、nverterisPowerfactorcorrection(PFC)converterisaveryessentialwellknown.Whentheinductorcurrenttoucheszero,thecomponentofpowersupply.Incommercialproducts,theswitchturnson.Afterafixedon-time,theswitchturnsoff.switchingfrequencyofPFCconverterisusuallylowerth
7、anhundredsofkHz.PFCconverterconsumesapproximatelyoneHence,thepeakcurrentofinductorfollowstheequationthirdvolumeofpowersupply.Increasingtheswitchingbelow.frequencycanreducethevolumeofPFCconverter.݅=ܶ(1)Furthermore,increasingtheswitchingfrequencyt
8、oMHzcanAslongasTonisfixed,thepeakcurrentofinductorfollowsgreatlyraisingthecornerfrequencyofEMIfilterandreduceVin.Theoretically,thewaveformofinductorcurrentisathefiltersize.Thus,thepowerdensityofpowersupplycanbeseriesoftrianglewav
