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ID:33403515
大小:5.20 MB
页数:64页
时间:2019-02-25
《开关电源中的混沌现象的分析与反激式电源的研制-(5832)》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、AbstractAbs仃actChaosisamotionstatethatisdeterminedbutunpredictableinsystem.Thiskindof‘unpredictable’phenomenonismainlyproducedinnon-linearsystems.ByresearchingDC.DCconverterinswitchingpowersupply,wefounddiscoveredthatcorrespondingtothecircuitconfigurationisalso
2、differentduetothestateoftheswitchtube,alargenumberofbifurcationandchaosphenomenonareproducedinthechangingprocess,suchassystemcollapsecausedbysuddendisorder,outputinstabilityinsystemscausedbytheintermittentoscillationandtheemergenceofmuchofelectromagneticinterfe
3、rence.Therefore,byresearchofchaosphenomenainDC-DCconverters,wecanlearnmoreaboutthisnonlinearbehavior,inthisway,wecanchoosereasonableparametersinthedesignofswitchingpowerSupplycircuit,inordertoavoidchaosphenomenon,SOthattheoutputcanbemorestable.Thisthesisdescrib
4、estheknowledgeofchaostheory,afewbasicfeaturesofchaosphenomenon,technicalindicationsusedtodetermineachaossystem,aswellasseveraltypicalcircuitsthatleadtochaosinDC—DCconverters.ThenbyathoroughstudyofthechaosdynamicsmodelingmethodsinDC—DCconverters,andultimatelydis
5、crete.timenonlineariterationmappingofthesystemstatevariablesisselectedtoanalyzetheBuck-Boost,FlybackconverterChaosandbifurcations,Buck-BoostConverterflyback+converterastheobjectofstudy,byabriefanalysisoftheirbasicworkingprinciples,theirdiscrete-timeiterativenon
6、linearmappingmodelisestablished,thesimulationisalsodidinMatlab,inputvoltageandinductorpowerareselectedassensitiveparameterofthesystem,weobtainthebifurcationdiagramofaconverterwhentheychange,inthisway,wecanresearchtherelationshipbetweenchaosphenomenaaswellasbifu
7、rcationphenomenaandsensitiveparametersinsystems.FinallysystemsimulationcircuitofBuck-BoostConverterisestablishedinSaber,Inputvoltageasasensitiveparameterofthesystem,toobservethetime。domainwaveformofthevoltageacrossthecapacitorandinductorcurrentchangesineachcycl
8、e,andfurtherverifythecorrectnessofdiscretemathematicalmodelandChaosaswellasbifurcationphenomenoninconverters.Anirreplaceablepositioninthepowermarket,applicationflybackconver
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