資源描述:
《Algorithms to overcome time delay in digital peak current control.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
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