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本文主要介绍了故障注入与故障诊断在集成电路发计上的应用,以及故障注入及故障诊断对于集成电路容错性和测试性设计的意义,将集成电路的测试性设计方法聚边界扫描技术与故障注入和故障诊断的方法相结合,讲述了边界扫描、故障注入及故障诊断技术的电路原理。讨电路系统测试性辅助设计进行了归纳和总结。 相似文献
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模拟电路已广泛应用于航空电子系统,模拟电路的失效会影响系统的功能,引起系统故障,甚至引发灾难性的安全事故。为快速准确地实现模拟电路的故障诊断,该文引入概率神经网络方法,并针对传统概率神经网络方法中的诊断准确性、诊断效率问题,提出基于K-means与概率神经网络的模拟电路故障诊断方法,定义聚类有效性指标,采用K-means聚类分析与有效性指标分析相结合的方式,选取聚类中心作为模式层神经元训练概率神经网络模型,从而降低模型的复杂程度,大大减少故障诊断时间。最后,以有源滤波电路为对象,通过与传统概率神经网络方法以及随机概率神经网络方法的对比分析,验证该文方法在故障诊断准确性以及故障诊断效率上的优越性能。 相似文献
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提出一种基于PCA-神经网络的电力电子整流装置故障诊断方法.首先对故障信号用主元分析法(PCA)提取特征向量.然后用神经网络进行训练和测试.通过三相可控整流电路晶闸管断路故障诊断实验结果表明,该方法能够简化神经网络的结构,提高网络的训练速度,并获得了很好的诊断效果. 相似文献
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针对高精度谐振式露点测量系统中电路故障诊断问题,提出了一种基于改进的麻雀搜索算法(Improved Sparrow Search Algorithm, ISSA)优化智能分类器参数的电路故障诊断模型,采用测前仿真故障诊断方法中的智能诊断方法,选择适用于小样本、非线性问题的支持向量机(Support Vector Machine, SVM)作为智能分类器,针对麻雀搜索算法中收敛速度慢、易陷入局部最优等问题进行改进,并将改进后的优化算法用于SVM参数寻优,构建ISSA?SVM故障诊断模型用于谐振电路故障诊断。实验结果显示,ISSA?SVM模型在建立的电路上能够达到88.9%的故障诊断率,可靠性较强,能够作为高精度谐振式露点传感器电路的故障诊断方法。 相似文献
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本文以某型号兵器部分电路为例,应用模拟电路故障诊断理论与微机技术,研究模拟电路故障字典的建立方法,故障自动诊断系统硬件,软件构成与功能等几个问题,文中所述的故障诊断方法的优点是在线计算量小,所需测试点少,尤其对单,硬故障的诊断简单而有效。 相似文献
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In the field of energy conversion, the increasing attention on power electronic equipment is fault detection and diagnosis. A power electronic circuit is an essential part of a power electronic system. The state of its internal components affects the performance of the system. The stability and reliability of an energy system can be improved by studying the fault diagnosis of power electronic circuits. Therefore, an algorithm based on adaptive simulated annealing particle swarm optimization (ASAPSO) was used in the present study to optimize a backpropagation (BP) neural network employed for the online fault diagnosis of a power electronic circuit. We built a circuit simulation model in MATLAB to obtain its DC output voltage. Using Fourier analysis, we extracted fault features. These were normalized as training samples and input to an unoptimized BP neural network and BP neural networks optimized by particle swarm optimization (PSO) and the ASAPSO algorithm. The accuracy of fault diagnosis was compared for the three networks. The simulation results demonstrate that a BP neural network optimized with the ASAPSO algorithm has higher fault diagnosis accuracy, better reliability, and adaptability and can more effectively diagnose and locate faults in power electronic circuits. 相似文献
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分析了故障字典法在实际应用中存在的不足,提出将单位BP算法应用到电子线路的故障诊断中。对基于该方法的航空装备电子线路故障诊断进行了计算机仿真,并分析了网络参数的变化对训练结果的影响。仿真结果表明了该方法的合理性和有效性。 相似文献
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Protel DXP在电路板级仿真中的应用 总被引:4,自引:0,他引:4
板级仿真在今天的电路设计流程种扮演着越来越重要的角色,是检验电路设计的一种有效手段。本文主要介绍了使用Protel DXP进行电路板级仿真的特点和基本步骤。 相似文献
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A new adaptive analog test and diagnosis system 总被引:1,自引:0,他引:1
Cota E.F. Negreiros M. Carro L. Lubaszewski M. 《IEEE transactions on instrumentation and measurement》2000,49(2):223-227
This paper presents a low-cost analog test system with diagnosis capabilities. The tester is able to detect faults in any linear circuit by learning a reference circuit behavior in a first step, and comparing this behavior against the output of the circuit under test in a second step. For a faulty circuit, a third step takes place to locate the fault. The diagnosis method consists in injecting probable faults in a mathematical model of the circuit, and later comparing its output with the output of the real faulty circuit. This system has been successfully applied to a case study, a biquad filter. Soft, large, and hard deviations on components, as well as faults in operational amplifiers, were considered. Experimental results have proven the feasibility and efficiency of the proposed test and diagnosis system 相似文献
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Dienot J.-M. Batista E. Bernard M. 《IEEE transactions on instrumentation and measurement》2008,57(11):2405-2413
Some effects of physical parameters, such as temperature, on electromagnetic emission or susceptibility of electronic circuit boards are nonnegligible and can be enforced by new integrated complex electronic structures. This paper describes experimental improvements proposed on near-field and radiated-mode test setups, including the temperature parameter. New experimental investigations and methodology are driven to estimate the real external thermal impacts on electromagnetic behavior and compliance. With pertinent characterization results, a review of wideband frequency modifications of electromagnetic compatibility (EMC) responses on electronic configurations with active digital devices and a printed circuit board (PCB) wire network is presented and analyzed. 相似文献
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神经网络在电路诊断中的应用 总被引:6,自引:1,他引:5
目的:阐述了目前电路基于数据库技术和人工智能专家系统及神经网络原理的故障诊断系统。方法:将所记录的模糊症状输入到系统中,通过模糊运算后,运用神经网络学习算法来寻找故障类型。结果:介绍了人工神经网络技术在电路诊断中的应用,并给出系统故障诊断软件的设计,结论:所用专家系统和神经网络相结合的方法改进电子电路故障诊断是可行的。 相似文献
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研究了一种基于低功率铁心线圈的中频双级电子式电流互感器.通过对中频双级电子式电流互感器等效电路的分析,得到了电流误差和相位误差的表达式.为验证双级电子式电流互感器的中频传感性能,构建了基于差值法的中频双级电子式电流互感器校验系统,该系统采用32位DSP浮点芯片TMS320F28335进行数据采集控制和运算处理.实验结果表明,该双级电子式电流互感器在50~1 000Hz频率范围内的误差准确度可达0.05级. 相似文献
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Bellone S. Licciardo G.D. 《IEEE transactions on instrumentation and measurement》2008,57(6):1112-1117
An electronic circuit for making accurate open-circuit voltage decay measurements is presented. The circuit overcomes the main limitations that occur in the standard method when used for carrier lifetime characterization because it realizes the ldquoopen-circuit conditionsrdquo of the device under test with an impedance higher than 100 MOmega and reduces the noise that is inherent in the differential operation of the method. 相似文献