板级电路检测中的EMI热点分析技术及算法  

EMI hot spot analysis technology and algorithm in board⁃level circuit inspection

作　　者：何宇昊 刘晨[2] 张兆华[1] 张明辉 慕文博 HE Yuhao;LIU Chen;ZHANG Zhaohua;ZHANG Minghui;MU Wenbo(The 14th Research Institute of CETC,Nanjing 210039,China;Institute of Circuit CAD,Xidian University,Xi’an 710071,China)

机构地区：[1]中国电子科技集团公司第十四研究所,江苏南京210039 [2]西安电子科技大学电路CAD研究所,陕西西安710071

出　　处：《现代电子技术》2022年第9期132-136,共5页Modern Electronics Technique

基　　金：国家国防科技工业局科研基础项目(JCKY2018210A001)。

摘　　要：PCB板级电路的腐蚀失效往往会带来不可预知的电气故障,传统检测电路板腐蚀失效的方法(AOI、AXI)受人工限制和非上电操作的影响,电子设备检测定位一直是技术难题,往往带来调试周期延长和检测成本增加,给PCB板级电子单元的大规模检测实施带来了诸多不确定性。文中提出一种EMI热点分析技术,通过对电路EMI(电磁干扰)特性的检测,利用合理的故障算法分析扫描得到的电路板工作时的磁场图像和曲线,建立EMI热点分析诊断规则信息数据库,依据数据库规则信息对高速板级电路进行诊断,能较为准确地判断电气故障位置。The corrosion failure of PCB board⁃level circuits often leads to unpredictable electrical failures.The traditional detecting methods of circuit board corrosion failure,for example,AOI(automatic optical inspection),AXI(automatic X⁃ray inspection),are affected by manual limitations and non⁃power⁃on operations.The detection and positioning of electronic equipment have always been the technical difficulties,which often leads to prolonging of debugging cycles and increasing of inspection costs,and causes uncertainties to the implementation of large⁃scale inspections of PCB board⁃level electronic units.An EMI(electromagnetic interference)hot spot analysis technology is proposed in this paper.By the detection of EMI characteristics of the circuit,a reasonable fault algorithm is used to analyze the magnetic field images and curves obtained by scan during the circuit board operation,and the rule information database for EMI hot spot analysis and diagnosis is established.And then,the high⁃speed board⁃level circuits are diagnosed according to the database rule information.Therefore,it can more accurately determine the location of electrical faults.

关 键 词：EMI热点分析 PCB电路板 电路检测 异常区域识别 诊断规则数据库 技术验证 

分 类 号：TN407-34[电子电信—微电子学与固体电子学]