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1、270IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.61,NO.1,JANUARY2014DigitalControllerDesignforLowSourceCurrentRippleFifth-OrderBoostConverterMummadiVeerachary,SeniorMember,IEEEAbstractInthispaper,anew?fth-orderboostpointofloadnOrderofpolynomial.converte
2、risproposed,andthen,adigitalcontrollerisdesignedP(z)z-domainpolynomial.usingaTchebyshevpolynomialapproach.Theproposedconverterk1,k2,k3,k4Digitalcontrollercoef?cients.hasareducedsourceripplecurrenttogetherwithabetterboost-φState-transitionmatrix.ingcap
3、abilityatlowerdutyratios.Discrete-timemodelsoftheconverterareformulatedandthenusedintheidenti?cationofXSteady-statesolutionofstatemodel.thedirectdigitalcontrollerstabilizingregion.Thesediscrete-timex?[n]Small-signalperturbationinx[n]atnthtransferfunct
4、ionsaretransformedintoaTchebyshevrepresen-samplingtime.tation,consistingofconvertercontrol-to-outputandcontrollertransferfunctions,whicharethenusedtoascertaintheexistenceofastabilizingcontroller,andifstabilizationispossible,thentheI.INTRODUCTIONentire
5、setofgainsisconstructivelydetermined.Usingthismethod,thecontrollergainrangeisobtainedasasetofinequalitiesintwoHErequirementforhigh-frequencypowerconversionvariablesfora?xedthirdvariable.BysweepingthethirdvariableTthroughlow-powercompactelectroniccircu
6、itshasin-overitsentirerange,thecompletestabilizingsetsareobtained.creasedinrecentyears.AspowerconversionsystemsbecomeWithintheseranges,theoptimaldigitalcontrollerparametersincreasinglyminiaturized,increasingthepowerdensityintheareobtainedthroughaconst
7、rainedoptimizationproblemusingageneticalgorithm.Anintegraltimeabsoluteerrorperformancepointofloadconvertersisoneofthechallengingissuesfacingindexisusedintheoptimization.A30-W,12-to28-V,and100-kHzthepowersupplydesigners.Oneoptioninswitch-modecon-labora
8、toryprototypeclosed-loopconverterhasbeendevelopedversion[1][4]istoreducethesizeofthemagneticelements,andthentested,bothasasimulationandexperimentally,foritsifpossible,avoidingtheuseoftransformerswhereverisolationvoltageregulationcapabilityagai
