连接不当引起电磁干扰的一个案例

AnEMICausedbyImproperGrounding200237(EMI)EMIEMI(EMI)AbstractAnEMIcausedbyimpropergroundingisdescribedinthispaper.Itsphenomenonisrecorded.Analyzingandcontrollingproceduresareilluminatedinstepbystep.FromthisEMIaccidentwehavehadalesson,andrealizetherelationshipbetweenEMIandgroundingloop,andpaymoreattenuationoncablingandgroundingdesigninordertocontrolthegroundingloopareaassmallaspossible.,KeywordsElectromagneticInterference(EMI),Grounding,GroundingrodGroundingloop(EMC)7678EMI(EMIEMIEMIEMI()380V50HzTN-C-S21ABCNNPEPEPEPEPE.QEMIEMI380V50HzTN-C-S11ABTN-C-STN-C-S50C1PETN-C-SPEPEPE1DPEPETN-C-SPE1PEPENPEPEPEPEN122EE=11ddtABdABA2B=22BIµR3333,E──Vf──HzL──mI──AR1──R2──f=100MHzL=50mI=10µAR1=0.02mR2=5mE=5.43VEMIL50mR12mmR25mI10µAI10µA10µA1001000EMIE300EMIEMI1QPEE=1.25610-7fLIR2/R133ELR1R2IIµ2πR300EMIEMIEMIEMI2EMIEMIEMCEMIEMCEMIEMCEMIEMIEMIEMIEMIEMIEMIEMIEMIEMIEMI19881993GJBZ25-91IEEEonEMCInternationalSymposiumRecording,JohnD.M.OsbornandDonaldR.J.White,GroundingARecommendationfortheFuture,pp.155-160,1987HenryW.OttControllingEMIbyProperPrintedWiringBoardLayout,EMCInternationalSymposiumRecording,pp.127-132,Zurich,1985