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1、i236FEEDBACKCOMPENSATIONDESIGNFORSWITCHEDMODEPOWERSUPPLIESWITHARIGHT-HALF-PLANE(RHP)ZEROK.Kittipeerachon,C.BunlaksananusornFacultyofEngineering,KingMongkut'sInstituteofTechnologyLadkrabang,Bangkok10520,Thailand,Fax:662-326-4225,E-mail:kbchanin@kmitl.ac.thKeywords:Feedbackc
2、ompensationdesign,Right-Half-Planeadditional90"phaselagintroducedbytheRHPzeromakes(RHP)zero,SwitchedModePowerSupplies(SMPS)thefeedbackloopmoredifficulttostabilisethantheirbuckcountelparts.ThebandwidthoftheseconvertersisusuallyAbstractlimitedtobebelowthefrequencyatwhichtheR
3、HPzerooccurstoensurestableoperationoftheconverters.IntheAboostandflybackconvertersoperatinginContinuousrealmofcontrolengineering,asystemwithaRHPzeroisConductionMode(CCM)arenotoriousfortheirdifficultreferredtoasanon-minimumphasesystem[SI,whichiscontrolloopstabilisationandsl
4、uggishresponse.Thispaperknownforitsdelayedandsluggishresponse.Feedbackdescribesfeedback'compensationdesignoftheseconverters.compensationdesignin[3,6-81dealswiththedesignofbuck-Designofthetwoselectedcompensationcircuitsisillustratedtypeconverters.Inthispaper,feedbackcompens
5、ationofwithaCCMboostconverter,withexperimentalresultsgivenSMPSwithanon-minimumphasecharacteristicispresented.toverifyeffectivenessofeachcompensationcircuit.2Feedbackcompensationcircuitdesign1IntroductionAcontrolblockdiagramofSMPSisshowninfigure1SwitchedModePowerSupplies(SM
6、PS)havebecomeastandardpowersourceformodemelectronicequipmentduetotheircompactnessandhighefficiency.TheSMPSmaintainanoutputvoltagetobewithinaprescribedlimitthroughouttheiroperatingconditions,bymeansoffeedbackcontrol.UCompensationpowergageInvariably,theSMPSfeedbackcontrolisd
7、esignedwiththeTcircuit--objectivesthattheoutputvoltagemustbestableandwellregulated,andrespondssensiblyfasttodisturbancessuchasasuddenchangeinloadcurrent.ThesetargetscanbeachievedFig.1AcontrolblockdiagramofSMPSbyappropriatedesignofacompensationcircuitintheGp(s)andG,(s)repre
8、senttransferfunctionsofapowerstagefeedbackloop.(powercircuitandPWMmodulatorcombined)andaS
