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1、DesignTechniquesforEMC–Part1CircuitDesign,andChoiceofComponentsByEurIngKeithArmstrongCEngMIEEMIEEEPartner,CherryCloughConsultants,AssociateofEMC-UKThisisthefirstinaseriesofsixarticlesonbest-practiceEMCtechniquesinelectrical/electronic/mechanicalhardwaredesig
2、n,tobepublishedinthisjournaloverthefollowingyear.Theseriesisintendedforthedesignerofelectronicproducts,frombuildingblockunitssuchaspowersupplies,single-boardcomputers,and“industrialcomponents”suchasmotordrives,throughtostand-aloneornetworkedproductssuchcompu
3、ters,audio/video/TV,instruments,etc.ThesearticleswerefirstpublishedintheEMCJournalasaseriesduring1999.Thisversionincludesanumberofcorrections,modifications,andadditions,manyofwhichhavebeenmadeasaresultofcorrespondencewiththefollowing,towhomIamverygrateful:Fe
4、ngChen,KevinEllis,NeilHelsby,MikeLangrish,TomLiszka,AlanKeenan,TSato,andJohnWoodgate.IamalsoindebtedtoTomSatofortranslatingthesearticlesintoJapaneseandpostingthemonhiswebsite:http://member.nifty.ne.jp/tsato/,aswellassuggestinganumberofimprovements.Thetechniq
5、uescoveredinthesesixarticlesare:1)Circuitdesign(digital,analogue,switch-mode,communications),andchoosingcomponents2)Cablesandconnectors3)Filtersandtransientsuppressors4)Shielding5)PCBlayout(includingtransmissionlines)6)ESD,electromechanicaldevices,andpowerfa
6、ctorcorrectionAtextbookcouldbewrittenaboutanyoneoftheabovetopics(andmanyhave),sothismagazinearticleformatcandonomorethanintroducethevariousissuesandpointtothemostimportantofthebest-practicetechniques.Beforestartingontheabovelistoftopicsitisusefulseetheminthe
7、contextoftheidealEMClifecycleofanewproductdesignanddevelopmentproject.TheprojectEMClifecycleTheEMCissuesinanewprojectlifecyclearesummarisedbelow:?Establishmentofthetargetelectromagneticspecificationsforthenewproduct,including:{Theelectromagneticenvironmentit
8、mustwithstand(includingcontinuous,high-probability,andlow-probabilitydisturbanceevents)andthedegradationinperformancetobeallowedduringdisturbanceevents;{Itspossibleproximitytosensitiveapparatusa
