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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.29,NO.4,APRIL20142027I2AverageCurrentModeControlforSwitchingConvertersYingyiYan,StudentMember,IEEE,FredC.Lee,PaoloMattavelli,SeniorMember,IEEE,andPei-HsinLiu,StudentMember,IEEEAbstractConstantfrequencyaveragecurrentmode(ACM)controlisaw
2、idelyusedcontrolschemeforconvertersrequiringprecisecurrentcontrol.However,itstransientresponseisrelativelyslow,whiletheswitchinglossanddrivinglosssignificantlydimin-ishthelightloadefficiency.Tosolvetheseissues,theI2controlACMisproposed.Bycombiningthefastdirectcurrentfeedbacka
3、ndintegralfeedback,theI2controlachievesbothwideband-widthandaccuratecurrentcontrol.Asaparticularembodimentofthisconcept,byadoptingconstanton-timemodulation,constanton-timeI2controlneedsnoartificialramp,andhasafastdynamicresponse.Moreover,duetothedecreaseoftheswitchingfrequen
4、cy,constanton-timeI2controlimprovestheefficiencyindiscontinu-Fig.1.PCM-controlledbuckconverter.ousconductionmode.TheconceptofI2controlcanbeextendedtoothermodulations.Asmall-signalmodelusingthedescribing-Toachieveanaccuratecurrentcontrol,averagecurrentmodefunction-basedequiva
5、lentcircuitmodelisproposed.Themodelisaccurateupto1/2switchingfrequency.Basedonthemodel,the(ACM)controliswidelyusedinpowerconverters.Manycom-designguidelinesarediscussed.TheproposedcontrolisverifiedmercialICadoptACMcontrolfordifferentapplications,includ-withsimulationandhardw
6、aremeasurementresults.ingthemultiphasevoltageregulator(VR)[3],[4],point-of-loadIndexTermsAveragecurrentmodecontrol,designguideline,converter[5],[6],LEDdriver[7],batterycharger[8],powerequivalentcircuit,modeling,transientresponse.factorcorrection(PFC)[9],andotherapplications
7、[10].ACMcontrolimprovesthecurrentaccuracy,butithastwomajorlimitations.First,thetransientresponseofACMcontrolI.INTRODUCTIONisusuallyslowerthanthatofothercurrentmodecontrols,e.g.,ENERALLY,currentmodecontrolssimplifythefeed-PCMcontrol.Duringthestepchangeofvc,inductorcurrentiLG
8、backdesignandimprovedynamicperformance[1],[2].needsseveralswitchingcyclestotrackth
