电磁兼容接地分析与设计袁胜军,阳川,李博识,贺伟,廖啟龙(重庆赛宝工业技术研究院有限公司,重庆401332)摘要:电磁兼容性(EMC)是电子产品的重要指标,是其可靠运行的重要保证。“地”的设计对产品EMC的影响很大,是EMC的难点。传统意义上“接地”仅从直流性能的观点出发考虑,认为接地阻抗是其直流或低频电阻,忽略了EMC关注的频率范围内接地导体的寄生电感与集肤效应是导致EMC问题的关键。良好的接地设计可避免干扰电流流过产品内部的等效天线,通过接地方式引导电流流向,能够更好地防护电磁干扰,抑制电磁发射,并且无需任何额外的单位成本。通过分析不良接地方式的等效天线模型,给出电磁兼容接地设计思路及分析方法。关键词:电磁兼容性;电子设备;接地技术中图分类号:TN03文献标志码:A文章编号:1672-5468(2022)01-0072-04doi:10.3969/j.issn.1672-5468.2022.01.015EMCGroundingAnalysisandDesignYUANShengjun,YANGChuan,LIBoshi,HEWei,LIAOQilong(ChongqingCEPREIIndustrialTechnologyResearchInstituteCo.,Ltd.,Chongqing401332,China)Abstract:Electromagneticcompatibility(EMC)isanimportantindexofelectronicproductsandanimportantguaranteeoftheirreliableoperation.Thedesignof“ground”hasgreatinfluenceontheEMCofproducts,whichisthedifficultyofEMCdesign.Inthetraditionalsense,“grounding”isonlyconsideredfromthepointofviewofDCperformance,andthegroundingimpedanceisconsideredastheDCorlow-frequencyresistance,whichignoresthattheparasiticinductanceandskilleffectofthegroundingconductorinthefrequencyrangeofelectromagneticcompatibility.Goodgroundingdesigncanpreventinterferencecurrentfromflowingthroughtheequivalentantennainsidetheproduct.Byguidingthecurrentflowthroughthegroundingmethod,electromagneticinterferencecanbebetterprotected,electromagneticemissioncanbesuppressedandnoadditionalunitcostisrequired.Byanalyzingtheequivalentantennamodelofthebadgroundingmethod,thedesignideasandanalysismethodsofelectromagneticcompatibilitygroundingaregiven.Keywords:EMC;electronicequipment;groundingtechnology收稿日期:2021-05-20修回日期:2021-06-22作者简介:袁胜军(1984—),男,四川南充人,重庆赛宝工业技术研究院有限公司工程中心主任...