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2210Vol.22No.10Oct2002200210ProceedingsoftheCSEE©2002Chin.Soc.forElec.Eng.0258-8013(2002)10-0022-06310027ANOVELTHREE-LEVELPOWERFACTORCORVECTCIRCUITWITHPASSIVESOFTSWITCHINGWUHong-yang,HEXiang-ning(PowerElectronicsInstituteofZhejiangUniversity,Hangzhou310027,China)ABSTRACT:Thepaperpvesntsanovelsinglephasethere-levelPFCcircuitwithpassivesoftswitching.Thethree-levelBuckandBoosttopologiesarederivedfromthetraditionaldiodeclampedthree-levelinverters'bridgelegfirstly.Then,asinglephasethree-levelPFCcircuitisdiscussedbasedonthethree-levelBOOSTtopology.Twopassivesoftswitchingsnubbercellsareaddedtothree-levelPFCcircuittosoftentheswitchingprocessesoftheswitchesandfreewheelingdiodes.It'soperatingprincipleanddesignconsiderationsarediscribledindetail.Atlast,a2kWprototypeofthesinglephasethree-levelPFCwiththepassivesoftswitchingisbuiltandtested.Thesimulatedandexperimentalresultsshowthatthecircuitcanrealizethethree-levelPFCfunctionandincreasesystemefficiencyaswellashavenoover-voltagestressonmainpowerswitches.KEYWORDS:multilevelconverter;PFC;softswitching3PFCBuckBoostBoostPFC12kWPFC59947006ProjectSupportedbyNationalNaturalScienceFoundationofChina(59947006).PFCTM464A1[1]PFCEMI3PFCBuckBoostBoostPFCPFC1023PFCBuckBoost1(a)[2]1(b)1(c)BuckBoostS1S2S3S4D4D3D2D1LI••••••••••••••••C1C2+++C1C2C2C1LLD1D2D1D2S1S2S1S2++___++_•••••••••••••••••••••(a)(b)Buck(c)Buck+__IIBuckBoostFig.1Practicalthree-levelBuck,Boosttopologyfromthree-levelconvertersPFCBoostPFCBoost220V400VBoost400VPFCBoostBoostPFC[3,4]ViVo/2PFCPFCPFCL1=1ViVO/2orL1=0ViVO/2(1)L2=1V1V2orL2=0V1V2(2)L1L2L1L2PFCL0PFC[4]L0(2)L03854L1L2S1S2ABACD1D2C1C2V1V2ViV0G1G2LogicCirruitL0L1L2AGNDAGNDV0V-SENSORO+UC3854•••••••••••••••••••••I_I++__+_••ViPFCFig.2Controlblockofthree-levelPFCcircuitL03PFCPFC2422[2](3)[2,5~8]1Lr1(2)1Cr1(2)1Cs1(2)3D1(2)1,D1(2)2,D1(2)3Lr1(2)Cr1(2)Cs1(2)Cs1(2)S1S2D1D2D21D22D23Cr2Cs2Lr2C2C1V1V2Lr1D11D12D13Cr1Cs1LOADLViACOBAV0Fig.3Three-levelPFCwiththepassivesoftswitching312LLr1(2)3S1D184(a)~(h)(5)t0tt1,4(at0S1S2D1S2D1t0S1Lr1D1IiS1S1Lr1(3)10101/)()()(rilrLttVtItI--=(3)t1tt2,4(b)t1D1D1VCS1VCr10D12Lr1Cs1Cr1D1D1Lr1Cs1Cr1V(t)))(cos())(sin()(1111111ttIttZVtIrrlr----=ww(4)1111111))(cos()(sin()(VttVttZItVrr+---=ww(5))()(00111tIttLVIirrr--=(6)111111)(rsrsrCCCCLZ+=(7)111111rsrrsCCLCC+=w(8)S1IiVCs1+VCr1=V1121211)(ZZIVIrrplr+=(9)t2Vcr1(t2)V1D1312121212)/()()(1ZCCVVZItIbrrrlr-+=(10)t2tt3,4(c)t2Cr1V1D13Vcr1Lr1,Cs1D12D132Ilr1Vcs1))(cos())(sin()(2212221111ttIttZCVCtIrrsrlr---=ww(11)))(cos())(sin(221112221)(1ttVCCttZIVSrrrtCS-+-=ww(12)))(cos())(sin(122121111ttIttZVIrrrr-+-=ww(13)112/1srCL=w(14)112/srCLZ=(15)t3Ilr1(t3)2Lr1Cs11025Cs1Vcs1pD1V1Vcs1p121121311)(srrrrCSpCSCVCILtVV+==(16)t3tt4,4dt3Ilr1D12D13Cr1Cs1S1S2t4tt5,4(e)t4S1D13Cr1S1V1-Vcr1)()(4141)(1ttCtIVVritcr--=(17)(19)S1t5tt6,4(f)t5Cr1D11D12Lr1Vcs1Cs1Lr12Ilr1Vcs1(18)(19)))(sin()(52221)(1ttZtVIcstlr-=w(18)))(cos()(5221)(1tttVVcstcs-=w(19)t6tt7,4(g)t6ilr1IiD12D13IiD11Cs1Vcs1D1Vcs122)()()()(616611ttCtItVtVsicscs--=(20)t7tt8,4(h)t7Cs1D11D1Cs1D11t01S1di/dtD1Lr126D12D13Cs1D11D12D13S11/2Lr1Irr2+1/2Cr1V121/2Lr1Ii2(21)Cr1Irr3(9)(18)Cr1S1D1Lr1Cr1(18))/(111srCCVCs1Cr125,0.2V14S1D1PFC12kWPFC2mHIRFP460()HFA25TB60C1=C2=1410μF220V(a)1(b)2•D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL••D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL•(c)3(d)4•D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL••D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL•Cr2Cr2++++_+_+Cr2Cr2++++D1D1D1D1(e)1(f)2•D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL••D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL•Cr2Cr2++++D1D12622(g)3(h)4•D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL••D11D12D13Cr1Vcr1Cs1Vcs1ILr1Lr1Lr2AOBS1S2D2D21D22D23Cs2C2V2C1V1IiL•Cr2Cr2++++D1D1Fig.4Operatingstagesofthree-levelPFCwithsoftswitchingVg1Vs1Is1Ir1Vcr1Vcs1VD1ID1ID11ID12ID13t0t1t2t3t4t5t6t7t0t1t3PFCFig.5Correspondingwaveformsofthree-levelPFCwithsoftswitchingu/V20836430405060t/ms-25PFCFig.6Simulationwaveformofthree-levelPFC5ms/div100V/divPFCFig.7Experimentalwaveformofthree-levelPFC400V40kHzLr1(2)18μHCr1(2)43nFCs1(2)1μFD1(2)1,D1(2)2,D1(2)3MUR8100(6)Pspice8.0(7)100MW/div2μs/div(a)S1(b)D15μs/div100V/divUIFig.8Voltageandcurrentwaveformonpowerdevicesunderhardswitching89Cr1(2)9182PFCPF0.9710PFC7(aPFCPF0.991027100V/div2μs/div(a)S1(b)D15μs/div100V/divFig.9VoltageandcurrentwaveformonMOSFETwithproposedpassivelosslesssnubberPF11PFC100V/div5ms/divPFCFig.10Inputvoltageandcurrentwaveformsofthree-levelPFCwithproposedsoftswitchingPFCEMI400800120016002000P/Wh/%929394PFCFig.11Efficiencycurveofthree-levelPFCwithhardswitching/softswitching33PFCPFC[1]LaiJihsheng,PengFangzheng.Multilevelconverter-anewbreedofpowerconverters[J].IEEETrans.onIndustrialApplications.1996,32(3)509-517.[2](WuHongyang).[D].(HangzhouZhejiangUniversity)2001.[3]MichaelT.Zhangetal,Singlephasethree-levelboostpowerfactorcorrectorconverter[C].Proc.IEEEAPEC'95434-439[4]LinBorren,LuHsinhung.Single-phasethree-levelPWMrectifier