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1、AlgorithmstoOvercomeTimeDelayinDigitalPeakCurrentControlGuohuaZhou,JianpingXu,MingzhiHe,NiChenSchoolofElectricalEngineering,SouthwestJiaotongUniversityChengdu,Sichuan,610031,ChinaAbstract—Constant-frequencyandvariable-frequencydigitalII.CONTROLALGORITHMpeakcurrentcontroltechniquesareintroducedinthi
2、spaper.ToovercometimedelayproblemofpreviousdigitalpeakcurrentFig.1showsthedigitalpeakcurrentcontrolbuckconverter,(DPC)controlinconstantswitchfrequency,twonewalgorithmswiththedigitalcontrollerconsistedofanalogtodigitalareproposedandstudied.Oneisanimproveddigitalpeakconverter(ADC),errorcompensator(EC
3、)anddigitalpulsecurrent(IDPC)controlalgorithminconstantswitchfrequencywidthmodulator(DPWM).InFig.1,Vdref,vgandvaretheandtheotherisavariable-frequencydigitalpeakcurrent(VF-referencevoltage,inputvoltageandoutputvoltagerespectively,DPC)controlalgorithm.Thecontrollawsoftheproposeddigitalalgorithmsaredi
4、scussedandcompared.Small-signalanalysisisvinandvsarethesampledinputvoltageandsampledoutputalsoperformedtostudytheeffectofthetimedelay.Transientvoltageintheouterlooprespectively,isisthesampledripplesimulationresultsaregiventofurtherverifytheanalysisresults.currentflowingthroughinductorLintheinnerloo
5、p,vcistheI.INTRODUCTIONcontrolsignal,whichisgeneratedbycompensatingtheerrorMuchattentionhasbeenpaidonthedigitalcontrolofsignalbetweenVdrefandvsinECblock,Reistheequivalentswitchingdc-dcconvertersduetoitsbenefitsoflowpowerseriesresistorofoutputfiltercapacitorC,andRistheloadconsumption,immunitytocompo
6、nentsvariations,abilitytoresistor.interfaceeasilywithdigitalsystems,flexibilitytoimplementA.DigitalPeakCurrent(DPC)Controlsophisticatedcontrolschemesandfasterdesignprocess[1,2].However,timedelaycausedbysamplingandalgorithmFig.2showstheinductorcurrentwaveformofDPCcontrolcalculationofdigitalcontrollo
7、ophasgreateffectonthebuckconverterwithleading-edgemodulation[4],wherethetransientperformanceofswitchingdc-dcconverters.Usually,solidlinecorrespondstothesteadystateoperation,whilethethetimedelayofdigitalcont
