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1、PreparedBy:JimmyLiu（刘学超）DirectedBy:Prof.ZhangBO（张波教授）SCUT-ASTECMASTERPROGRAMAZero-Voltage-SwitchingPWMThree-LevelDC/DCConverterUsingOutputSaturableInductors带输出饱和电感的零电压开关三电平直流变换器INTRODUCTIONTHENOVELZVS-TLDC/DCCONVERTERCONTROLMETHODOFTLDC/DCCONVERTERDESIGNMETHOD&EX
2、PERIMENTALRESULTSCONTENTINTRODUCTIONWhatisThree-LevelDC/DCConverter?Three-Level,PowerFactorCorrectionandSoftSwitchingarethehotspotsonpowerelectronics.Ontheonehand,thePowerFactorCorrection(PFC)stageisanimportantstageforthefuturegenerationofthree-phasedistributedpo
3、wersystemsformediumpowerapplicationsbecauseoftheIEC61000-3-2ClassAstandard.TheThree-Phasesingle-switchBOOSTrectifierisaninterestingoptionforthisAPFCstage,becauseitcomplywiththeaforementionedstandardwithsimplicity,efficiency,reliability,andlowcost.However,inordert
4、oreducetheharmonicsdistortioninthisconverter,itsinputtooutputcharacteristichastobeincreased.Therefore,inatwo-stageAC/DCconverter,thisincrementalsoincreasesthevoltagestressintheDC/DCstep-downconverter.Insomeconditionsthevoltagestresscanbeevenupto1000v.In1992,J.R.P
5、inheiroandIvoBarbiproposedtheseriesswitchesThree-LevelDC/DCconverters(TLDC/DCconverter)sothatitcanreducethevoltagestresstohalfofinputvoltage.Ontheotherhand,inordertoreducetheconvertervolume,powersupplyshouldachievehighfrequency.Withtheimprovementofoperatingfreque
6、ncy,softswitchingshouldbeintroducedinordertoreducetheswitchingloss,improveefficiencyanddecreaseEMI.INTRODUCTIONThree-LevelSoftSwitchingDC/DCConverterINTRODUCTIONFig1-1istheconventionalTLDC/DCconverter,whichwasproposedbyJ.R.PinheiroandIvoBarbi.Fig1-1ThebasicTLDC/D
7、CconverterAsmentionedabove,softswitchingisessentialintheimprovementofoperatingfrequency.SoftswitchingTLconvertercanbedividedintotwogroups:Zero-Voltage-SwitchingandZero-VoltageZero-Current-Switching.Thefollowingwillsummarizetheircharacters.INTRODUCTION(1)Thetopolo
8、gyiseasytoachieve;(2) LeadingswitchesVT1andVT4canrealizeZVSinwideloadrange,laggingswitchesVT2andVT3canachieveZVSinfullload;(3) Thevoltagestressofswitchesi
