欢迎来到天天文库
浏览记录
ID:41051879
大小:484.27 KB
页数:31页
时间:2019-08-15
《开关电源闭环控制电路的设计分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、DesigningStableControlLoopsByDanMitchellandBobMammanoABSTRACTTheobjectiveofthistopicistoprovidethedesignerwithapracticalreviewofloopcompensationtechniquesappliedtoswitchingpowersupplyfeedbackcontrol.Atop-downsystemapproachistakenstartingwithbasicfeedbackcontr
2、olconceptsandleadingtostep-by-stepdesignprocedures,initiallyappliedtoasimplebuckregulatorandthenexpandedtoothertopologiesandcontrolalgorithms.SampledesignsaredemonstratedwithMathcadsimulationstoillustrategainandphasemarginsandtheirimpactonperformanceanalysis.
3、I.INTRODUCTIONStabletInsuringstabilityofaproposedpowersupplyPerturbationSystemsolutionisoftenoneofthemorechallengingResponseaspectsofthedesignprocess.NothingismoredisconcertingthantohaveyourlovinglycraftedbreadboardbreakintowildoscillationsjustasitUnstabletis
4、beingdemonstratedtothebossorcustomer,SystemPerturbationbutinsuringagainstthisunfortunateeventtakesResponsesomeanalysiswhichmanydesignersviewasformidable.PathstakenbydesignengineersoftenFig.1.Definitionofstability.emphasizeeithercut-and-tryempiricaltestinginAn
5、otherwayofvisualizingstabilityisshownthelaboratoryorcomputersimulationslookinginFig.2.Whilethisgraphicallyillustratesthefornumericalsolutionsbasedoncomplexconceptofsystemstability,italsopointsoutthatmathematicalmodels.Whilebothofthesewemustmakeafurtherdistinc
6、tionbetweenapproacheshaveaplaceincircuitdesign,abasiclarge-signalandsmall-signalstability.Whileunderstandingoffeedbacktheorywillusuallysmall-signalstabilityisanimportantandallowthedefinitionofanacceptablenecessarycriterion,asystemcouldsatisfythiscompensationn
7、etworkwithaminimumofrequirementandyetstillbecomeunstablewithacomputationaleffort.large-signalperturbation.ItisimportantthatdesignersrememberthatallthegainandphaseII.STABILITYDEFINEDcalculationswemightperformareonlytoinsureFig.1givesaquickillustrationofatleast
8、onesmall-signalstability.Thesecalculationsaredefinitionofstability.Initssimplestterms,abasedupon–andonlyapplicableto-linearsystemisstableif,whensubjectedtoasystems,andaswitchingregulatori
此文档下载收益归作者所有