简介:摘要:EMC电子产品产生危害的原因相当多,同样防止上述各种因素危害的手段和办法也相当多。比如,合理的PCB布线、良好的屏蔽以及合理的线路布置等。不过,由于受产品的成本及其自身因素的影响,这些方法并不一定会被全部地都应用到产品中。
简介:1.IntroductionTheEMCdesignforthePrintedCircuitBoardhasbeenapopulartopic.Guidelinesandtipsforhigh-speedPCBdesignscouldbefoundfromnumerousresources.WheninvestigatingEMIissuesassociatedwithcircuitboards,manydetailssuchasclockfrequencies,switchingrates,rise/falltimes,signalharmonics,datatransferrates,impedances,traceloading,andtypesandvaluesofthevariouscircuitcomponents,shouldbetakenintoconsiderations.ThephysicallayoutofthePCboardanditsassociatedmetalliccomponentsareimportantconsiderations.Specialattentionshouldbegiventotheplacementandcharacteristicsofsignalsourcecomponents,vias,
简介:摘要随着通信和电气技术的发展应用,电气与电子设备的干扰和抗干扰问题日益突出,电磁兼容的诊断测试越加显得重要。与传统的EMC测试系统相比,文中设计的测试系统分为2个部分,分别确认干扰源的频率范围和位置所在。能够更加快速、准确地得到干扰源的位置和频带参数,大大提高了解决问题的效率。
简介:MostofelectronicsengineershaveexperiencedEMIrelatedissues.IthasbeenunderstandableandacceptabletocomplainabouttheEMIwhenwehavetroubledebuggingourcircuitsorequipment.Peopleliketotreatitasablackboxforthisisagoodexcusetostopusfrominvestigatingwhat'sgoingonbehindthephenomenon.However,thefactisthatwiththeadvancesinmodemmicroelectronics,ithasbeengettingmorechallengingthaneverforelectronicsengineerstoeliminateorreducetheEMIcausedbyhigherfrequencyandhigher-degreeintegration.
简介:摘要:在了解与介绍EMC发射和辐射相关知识的前提下,文章充分考虑空调产品在EMC测试整改过程中的问题,根据其特有性提出空调产品在整改过程中的注意事项与特殊点,并结合实例提出整改方法。
简介:1.IntroductionAnyoneworkinginasystemselectromagneticcompat-ibilityenvironmentisusuallypainfullyawareofthefactthat,often,theweakestlinkinthesystemisthecabling.Whetherthisisthecableortheconnectorsthemselves,ormorelikelytheinterfacebetweenthecableandtheconnectorswheretheremaybeapoorconnectionofthecablescreen,theabilityofcablingtoleakorabsorbspurioussignalsisacauseofmuchEMCfrustration.ThissectionwilladdressthebasisofthecablingrelatedEMIphenomenonandthebestcablingpractice.