2005 Graphical Analysis of the Spectra of EMI Sources in Power Electronics

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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.20,NO.6,NOVEMBER20051491GraphicalAnalysisoftheSpectraofEMISourcesinPowerElectronicsFrançoisCosta,Member,IEEE,andDidierMagnon,Member,IEEEAbstract—Anewmethodofanalysisisproposedtographicallypredictthespectrumenvelopeofelectromagneticinterference(EMI)e

2、mittedbypowerelectronicsequipment.Relationshipsbetweenthetime-domain(waveforms)andthefrequency-domain(spectrum)ofsometypicalEMIsignalsobservedinpowercon-vertersarepointedout.SpecialattentionispaidtotheanalysisofthetransientfunctionsofEMIsignals.Itisshowntheybehaveasfilteringor“smoothing”f

3、unctionsinthehigh-frequencypartofthespectrum.IndexTerms—Electromagneticinterference(EMI)analysis,EMIfrequency-domainanalysis,spectrumgraphicalconstruc-Fig.1.Typicalinputstageofapowerconverter.tion.I.INTRODUCTIONODAY,powerelectronicsarewidelyusedinthetrans-Tportationfield(automotive,aerosp

4、ace,railways),inin-dustrialapplications(variablespeeddrive,inductionheating),inhouseholdequipment(lighting,cooking),orincommunica-tionsystems(mobilephones,computers).Unfortunately,powerelectronicsareintrinsicsourcesofhigh-levelelectromagneticinterference(EMI)duetothehigh-levelandgenerate

5、dbytheswitchingofsemiconductors.TheseEMIFig.2.Idealvoltageandcurrentwaveformsinachopper.andare,sourcesareeasilycoupledoutsidetheconvertersbymanyrespectively,theswitchingtimesofvoltageVandcurrentI.parasiticcouplingssuchastheleakagefluxoftransformers[1],[2],theparasiticcapacitancesofprint

6、edcircuitboards(PCB)s,beconsideredinthesecondsection.Inthelastpart,thehigh-fre-cables,ormotors[3][5],ortheradiationofconductors.Con-quency(HF)asymptoticalenvelopeofthespectrumofanEMIsequently,powerelectronicequipmentincludecostlyreductionsignalwillbediscussedinrelationtothesignalderivati

7、onorder.deviceslikeshieldingorEMIfilters.IthasbeenshowninPracticalconsiderationstoimprovetheswitchingwaveforms[6],thatconductedandradiatedperturbationshavecommonfeatureswillbegiventhroughoutthepaperwiththeaimofre-sourcesinpowerelectronics,constitutedbythevoltageandducingth