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1、Analysis,Design,andPerformanceEvaluationofFlying-CapacitorPassiveLosslessSnubberAppliedtoPFCBoostConverterBrianT.IrvingandMilanM.JovanovićDeltaProductsCorporationPowerElectronicsLaboratoryP.O.Box12173,5101DavisDriveResearchTrianglePark,N.C.27709,U.S.A.Abstract-Ab
2、oostconverterwhichemploysaflying-capacitor(ideally)losslessiftheenergyisrecycledorrecirculatedtopassivelosslesssnubbertoreducethelossescausedbytheeithertheinputoroutputoftheconverter.reverse-recoverycharacteristicoftheboostrectifierisApassiveresetnetworkconsistso
3、fcombinationsofdescribed.Thepassivesnubberconsistsofasnubberinductor,diodes,capacitors,resistors,andinductorswithouttheuseoftwosnubberrectifiers,andasnubbercapacitor.Thelossesareanadditionalswitch.Generally,softswitchingoftheboostreducedbyinsertingasnubberinducto
4、rintheseriespathoftherectifierinapassivePFCcircuitcanbeachievedwithalowerboostswitchandtherectifiertocontrolthedi/dtrateoftherectifierduringit’sturn-off.ThesnubberisanalyzedanddesigncomponentcountthaninanactivePFCcircuit,whichmakesguidelinesareofferedtoachieveopt
5、imumperformance.Theitattractiveathigherswitchingfrequencies.However,zero-proposedsnubberisappliedtoa500-Wpowerfactorcorrectedvoltageturn-onofthemainswitchisnotpossiblesincethe(PFC)boostconverterwhichisdesignedtooperateinthemomentofturn-onisnotanticipatedbythepass
6、ivesnubberuniversallinerange(90-264VRMS).Performanceevaluationsofcomponents.Therefore,themainswitchoperatesunderhard-theproposedsnubberaremadeandcomparedtotheswitchingconditions.Generally,thisdegradestheconventionalboostconverterwithrespecttoefficiencyandperforma
7、nceoftheconverterandmakesitlessattractivedevicetemperature.fromaperformancepointofview.Nevertheless,passivesnubberapproachesarewidelyusedsincetheyaregenerallyI.INTRODUCTIONsimplertodesignandrequirefewercomponents,makingthempotentiallymorecost-effectivethananactiv
8、esolution.Inmid-to-highpoweroff-linepowersupplies,theInthispaper,adesignorientedanalysisisperformedofacontinuous-conduction-mode(CCM)boostconverteristheflying-
