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36JMagnMaterDevicesVol37No112111.6100542.29610034(ContinuousCurrentMode,CCM)(DiscontinuousCurrentMode,DCM)AwAeTM433B1001-3830(2006)01-0036-03DesignofSingle-endedFlybackTransformerinHigh-frequencySwitchingPowerSupplyLVLi-ming1,XIAOJian-ping2,ZHONGZhi-yong1,SHIYu11.SchoolofMicro-ElectronicsandSolid-stateElectronics,UniversityofElectronicsScienceandTechnologyofChina,Chengdu610054China;2.29thInstitute,ChinaElectronicTechnologyGroupCorporation,Chengdu610034,ChinaAbstract:Inthispaper,weintroducetheoperatingprincipleofsingle-endedflybacktransformerundercontinuouscurrentmode(CCM)anddiscontinuouscurrentmode(DCM)anddesignmethodofareaproductforsingle-endedflybacktransformerforlowpowerswitchingpowersupply.Keywords:single-endedflybacktransformer;continuouscurrentmode;discontinuouscurrentmode;design1100AC/DCDC/DC0~300WAC/DC(750~1500W)AC/DCDC/DC30%,DC/DCDC/DCAC/DCDC/DC2005-08-112005-10-24E-mail:lv-lemon@163.com15%AC/DCDC/DC()[1]21Q1PulseWidthModulation,PWMTD12006237Q1D1[2]1DCMton(toff)2CCMtofftonDCMCCM2UinILDCM/CCMDCM/CCMPWMDCMCCMCCM=Uinton/Np=Vstoff/Ns12DCMCCMDCMtonLpIp(windinglose)CCMtonCCMLpDCM[3]DCMCCM(CCMIp=ImaxImin)1(a)(a)(b)(b)(A)DCM(B)CCM2DCMCCM38JMagnMaterDevicesVol37No133[4]33.1UinUoutPouthfs(T)Umos3.2Uf(50V)Uf=UmosUinDCmax50V2Np/Ns=Uf/Uout3UinDCminDmax=Uf(1Dmax)4Ip1Ip2Ip101/2(Ip1+Ip2)DmaxUinDCmin=Pout/h5Ip2=3Ip1Lp=DmaxUinDCmin/fsIp6Ip=Ip2Ip1=2Ip1Ip=Ip2AwAeAwAe=(LpIp22104/BwK0Kj)1.147Awcm2Aecm2LpHIp2ABwTK00.2~0.4Kj395A/cm2AwAeNp=LpIp2104/BwAe8lg=0.4pNp2Ae108/Lp9lgcmNpAecm2LpH[1].[J].,2000,31(4):26-31.[2],,.[J].,2004,15(2):50-54.[3],.[M].:,1999.[4]LloydHDixon.MagneticsDesignforSwitchingPowerSupplies[R].2001.1977200120018~2003920039