低成本的共模及差模檢知電路及電源濾波器設計的軟體化

LowCostCommon-andDifferential-ModeNoiseDiagnosticCircuitandComputer-AidedDesignofPowerLineFilterLowCostCommon-andDifferential-ModeNoiseDiagnosticCircuitandComputer-AidedDesignofPowerLineFilterByHsin-LungSuAdvisor:Dr.Ken-HuangLinDepartmentofElectricalEngineeringNationalsunYat-SenUniversityKaohsiung,TaiwanJune,2000i-LINUXLINUX-------2000,6,19ii882()()LowCostCommon-andDifferential-ModeNoiseDiagnosticCircuitandComputer-AidedDesignofPowerLineFilterchi873163641()()()Su()Hsin-Lung()()Ken-HuangLin()()()()Separator()Filter()ConductedEMIiiiEMIEMIEMIEMIEMIEMIivAbstractNowadays,electronicshasreallyflourishedwiththerapidprogressinscienceandtechnology.Besidesbeinglightandefficientoftheproducts,digitalizationandfasterspeedarealsorequiredwhichmaketheproblemofEMI,electromagneticinterference,becomemoreserious.Newerpowersuppliesusingswitchingtechnologybecomesmallerandsmaller.However,theyalsoproduceEMIproblemsthatneedtobeconsidered.Inthisthesis,weonlyaddresstheconductedEMI.Generally,thenoiseissuppressedbyaddingafilteratthepower-lineend.Hence,theEMIfilterplaysanimportantroletothesolutionofconductedemission.Theparticularfilterisrelatedtothetypeoftheconductedemission,includingcommon-modeanddifferential-mode.Asaresult,itisagreathelpforanengineertobeabletoseparatethenoise.Thereareseveralnoiseseparatorsinthepresentdays.Weproposenewseparators,whicharecapableofdetectcommon-modeanddifferential-modeseparately.Ourseparatorsarelow-cost,easilymanufacturedandareabletogiveexactnoisereadingswithoutadjustment.Incorporatingtheknownmethodsoffilterdesignandcombingprogrammingmeasurementthefilterdesigncanbemadeautomatic.Oneapproachmakesuseofthespectrumanalyzer,whichisconsideredtobearelativelyexpensiveinstrument.Wealsoproposeanotherapproachusingoscilloscope.Thetime-domainmeasurementisperformedandtransformedintofrequencydomainusingFFT.Arealisticdesignexampleisshowntogivesatisfactoryresults.v...................................................................................................i.........................................................................................iii.........................................................................................iv..................................................................................................v.........................................................................................vi.....................................................................................11-1..............................................................................................11-2..............................................................................................1EMI.............................................................22-1EMI............................................................................22-2EMI...................................................................52-3LISN........................................................................................62-4EMI......................................8....................................................................123-1....................................................................................123-2........................................................................................143-3(adeviceforaddingandsubtractingphaseandneutral)..................16.........................................................174-1....................................................................................174-2....................................................................................20.................................................235-1.................................................................235-2--------.................................27vi5-3--------............................................30...................................................................................336-1..................................................................336-2...........................................................................36................................................................397-1.....................................................................................................397-2............................................................................................40........................................................................................41viiFCC....................................................2FCC..................................................3VDE........................................................3VDE................................................3CISPR22................................................4CISPR22.........................................4.............................................................5LISN..................................................................6LISN..................................................................6aLISN...........................................................7bLISN..................