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1、AVERAGECURRENTMODECONTROLINPOWERELECTRONICCONVERTERS–ANALOGVERSUSDIGITALK.D.Purton*andR.P.Lisner***DepartmentofElectricalandComputerSystemEngineering,MonashUniversity,Australia,andSwitchModePowerConversionP/L,Melbourne,Australia**DepartmentofElectricalandComputerSystemEngineer
2、ing,MonashUniversity,AustraliaAbstractThispaperpresentsAverageCurrentModeControl(ACMC)asageneralpurpose,high-performanceall-roundcontrolmethodforAC-DCconversion,DC-DCconversion,andDC-ACconversion(includinggrid-feedinverters).Adetailedexaminationofthetypicalanalogcircuitimpleme
3、ntationandwaveforms,basedonsimulationsandexperimentalresults,isusedtoexplainhowACMCachievessuperiorperformance.Severalreporteddigitalimplementationsarecriticallyexamined.Finallyahybridanalog-digitalcontrolimplementationofACMCisproposed.1.INTRODUCTION“PWMConductanceControl”appe
4、arstobethefirsttousetheoutputofan“integrator-zero”compensatedAverageCurrentModeControl(ACMC)istypicallyaCEAandalinearrampasinputstothePWMtwoloopcontrolmethod(innerloop,current;outercomparator.Thisapproachwasdevelopedloop,voltage)forpowerelectronicconverters.ManycommerciallybyU
5、nitrode[4].oftheseapplicationshavebeeninthehigherswitchingfrequency,lowerpowersegment(upto10kW,atTheusualimplementationofACMCreliesonanalog20kHzandabove),butthisischanging.A30kWthreeoperationalamplifiersaserroramplifiers,andmakesphaseinverterusinganalogACMChasbeenreporteduseof
6、wide-bandsensingoftheinductorcurrent,to[1].ThemaindistinguishingfeatureofACMC,asincludeboththeACandDCcomponents.Figure1comparedwithpeakcurrentmodecontrol,isthatshowsabasicbuckconverterwithsynchronousACMCusesahighgain,widebandwidthCurrentrectification.Thevoltagewaveformrepresen
7、tingtheErrorAmplifier(CEA)toforcetheaverageofoneinductorcurrentisconnectedtooneinputoftheCEAcurrentwithintheconverter,typicallytheinductorwithlargegainatDCandlowfrequenciestoforcethecurrent,tofollowthedemandedcurrentreferencewithaveragevalueoftheinductorcurrenttofollowtheverys
8、mallerror,asacontrolledcurrentsource.currentreference,whichis
