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1、2010年2月电工技术学报Vol.25No.2第25卷第2期TRANSACTIONSOFCHINAELECTROTECHNICALSOCIETYFeb.2010ThePassiveSnubberCircuitSuitableforaThree-PhaseSingle-StageFull-BridgePFCConverterMengTaoBenHongqiWangDaqing(HarbinInstituteofTechnologyHarbin150001China)AbstractAnovelthre
2、e-phasesingle-stagefullbridgepowerfactorcorrection(PFC)converterispresented,whichcanrealizethefunctionssuchaspowerfactorcorrection、electricalisolationbetweeninputandoutputsidesandoutputvoltageregulation.Themechanismandsuppressionmethodofoscillatoryvolt
3、ageacrosstheprimarysideoftransformerisanalyzedindetailwhenthebridgediagonal-legswitchesturnon,andapassivesnubbercircuitisproposedtosuppressthisoscillatoryvoltage.Thesnubbercircuitiscomposedofcapacitor,inductorsanddiodes・Thecapacitorisconnectedinparalle
4、lwiththeprimarysideoftransformertosuppresstheoscillatoryvoltage・Theenergyofcapacitorcanbetransferredtotheloadduringoneswitchingcyclebytheresonanceoftheinductorandcapacitor.Theoscillatoryvoltageacrosstheprimarysideoftransformerandtheswitchesissuppressed
5、efficientlythroughthepassivesnubbercircuit,whichhasbeenverifiedbytheexperimentalresults・Keywords:Snubber.passive,powerfactorcorrection(PFC),three-phase,single-stage,full-bridge1IntroductionPowerqualityproblems,suchasnonsinusoidalcurrentwaveformswithlar
6、geharmoniccontentinjectedintheelectricnetwork,causeanumberofproblemsinthepowerdistributionnetworkandotherelectricalsystems11'31.Powerfactorcorrection(PFC)isoneofthemosteffectivemethodstoreduceharmoniccurrentandincreasepowerfactor.TherearetwokindsofPFCa
7、ccordingtodifferentinputvoltage,oneissingle-phase,theotheristhree-phase・Single-phasePFCiscomparativelydeveloped,whileduetothecomplicatedcircuitstructureandcontrolling,three-phasePFCisunderdeveloping^431.Duetothedifferentstructure,three-phasePFChastwoki
8、nds:twostagetypeandsinglestagetype16''1.TwostagetypePFChasgoodperformance,ofwhichthefirststageisPFCcircuitandthesecondstageisThispaperanditsrelatedresearcharcsupportedbygrantsfromthePowerElectronicsScienceandEducationDevelopmentProgramo
