基于斜率故障模型的模擬電路軟故障字典法

提出了一種新的模擬電路故障字典法。與傳統(tǒng)方法不同，該方法利用兩個節(jié)點電壓之間的關(guān)系函數(shù)作為故障特征。對于線性模擬電路，節(jié)點電壓關(guān)系函數(shù)為一次函數(shù)，函數(shù)的斜率可以作為故障模型，同時可以診斷硬故障和參數(shù)（軟）故障。由于模擬電路存在容差，最小直線距離法可以用處理電路中的容差問題。
關(guān)鍵詞：節(jié)點電壓關(guān)系函數(shù)；線性模擬電路； 斜率故障模型；參數(shù)故障診斷；容差
A Soft Fault Dictionary Method for Analog Circuit Diagnosis Based on Slope Fault Model Wang Peng, Yang Shi-yuan (Dept. of Automation, Tsinghua University , Beijing 100084, China) 【Abstract】 A new dictionary approach for analog circuit diagnosis is reported in this article. Unlike other diagnosis methods, the reported approach uses the voltage relation function between two nodes as fault characters for predefined faults in the fault set. For linear analog circuits, the voltage relation function is a linear function and the slope can be the fault character to diagnose both catastrophic faults and parametric faults. Since tolerance exists in analog circuits, minimal distance approach is used to solve tolerance issue.
【Key words】 node-voltage relation function; linear analog circuit; slope fault model; parametric fault diagnosis;