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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.12,NO.2,MARCH1997369TimeQuantityOne-CycleControlforPower-FactorCorrectorsZherenLai,KeyueM.Smedley,Member,IEEE,andYunhongMaAbstractÐTimequantityone-cyclecontrolmethodisproposedItisalsopossibletomaketheinputcurrentproportionaltointhispaperforunitypower-facto
2、rac±dcconverters.Converterstheinputvoltagebyincludingacurrentloop.Thenonlinearcontrolledbythismethodoperateatconstantswitchingfre-carriercontrolforboostconverters[4]isagoodexample.quency,requirenocurrentsensing,haveasimplecontrolcircuit,Currentsensingisrequiredforthosecontrolmethods,sotheyandex
3、hibitresistiveinputimpedanceattheacside.Feedbackloopdesignmethodisprovidedtominimizethecurrentdistortionaremoresuitableforhigh-powerlevelapplicationsandCCMwhentheoutputvoltagerippleisnotnegligible.Experimentaloperation.resultsconfirmedthetheoreticalprediction.Thispaperproposesatimequantityone-cy
4、clecontrolIndexTermsÐSwitchingconverter,powerfactorcorrection,methodforpower-factorcorrectionrectifierswiththefollow-pulsewidthmodulation.ingfeatures:1)purelyresistiveattheinputportofarectifier;2)norequirementofhigh-voltageconversionratio;I.INTRODUCTION3)operatingatconstantswitchingfrequency;OSTR
5、ECTIFIERSarenonlinearloadstotheutility4)noneedofcurrentsensing;Mline,therefore,theyimposeareactivefundamental5)nocomplexcircuitssuchasthemultiplier;componentandsomehigherorderharmonicstotheline.6)easeofintegration.Thesecomponentsareundesirablebecausethey:1)produceAboostconverterisusedinthispape
6、rtoillustratetheprin-electromagneticinterferenceandlinevoltagedistortionand2)ciple.First,theprincipleofthecontrolmethodisintroduceddonotcontributetoloadpower,butincreasethermscurrentinSectionII.Then,theeffectoftheoutputvoltagerippleoninthetransmissionlinesand,thus,additionallosses.Ideally,thecu
7、rrentdistortionisdiscussedinSectionIII.ExperimentalthelinecurrenttotherectifiershouldbeproportionaltotheverificationisillustratedinSectionIV.Finally,conclusionslinevoltagesothatmaximumactivepowerisdeliveredtothearegiveninSectionV.lo
