容差模拟电路的模糊软故障字典法诊断  

A Fuzzy Soft Fault Dictionary Method for Diagnosis of Analog Circuits with Tolerance

作　　者：彭敏放[1] 何怡刚[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2005年第1期25-28,共4页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50277010);湖南省自然科学基金资助项目(04JJ6034);高等院校博士学科点专项科研基金资助项目(20020532016);湖南省科技计划项目(04FJ2003;03GKY3115);湖南大学撷英计划资助项目

摘　　要：提出了一种可以准确定位容差模拟电路软硬两类故障的模糊软故障字典法.该方法依据支路屏蔽的概念,求取电路的支路集屏蔽电流,并由元件参数分布规律计算容差对端口特性的影响,以此建立故障字典并构造故障阈值函数,从而实现容差电路的故障检测.在此基础上,应用网络分析与模糊数学,提出了一种故障隶属函数,据此进行容差电路的故障定位.该法有效地避免了故障因素与容差因素的相互交叠,大大降低了故障与容差间的模糊性.仿真试验表明,此法故障定位准确性高.A fuzzy soft fault dictionary method able of locating not only hard faults but also soft faults in analog circuits with tolerance was proposed. Based on the principle of branch screening, branch set screening currents were obtained, and the tolerance effort to terminal performance was analyzed and calculated according to element parameter deviation. Thus, a fault dictionary and a fault threshold function were established, by which fault detection in a tolerance circuit was performed. Furthermore, by using fuzzy mathematics and network analysis, a fault attaching function was put forward and applied to fault detection in the tolerance circuit. This method avoided the superposition effect of tolerance and fault, and so the fuzziness between fault and tolerance effort was greatly reduced. The high accuracy of the method was proved by means of simulation tests.

关 键 词：故障定位 模糊系统 字典法 屏蔽 容差电路 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]