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Capacitance is a critical performance characteristic of high-voltage-pulse capacitor which is used to store and discharge electrical energy rapidly. The capacitors usually are stored for a long period of time before put into use. Experimental result and engineering experience indicate that the capacitance increases with storage time and will eventually exceed the failure threshold, which means that the capacitor may fail during storage. This is a typical mode of degradation failure for long storage products. Further, the capacitance degradation path can be extrapolated in several stages based on the shifting characteristics. That is, the capacitance increases slowly or fluctuates in the initial storage stage that lasts about three months. Then it increases sharply in the middle stage which lasts about four months. After the two stages, the capacitor enters into the third stage in which capacitance increases constantly. This degradation phenomenon motivates us to study the storage life prediction method based on multi-phase degradation path model. The storage performance degradation mechanism of high-voltage-pulse capacitor was investigated, which provides the physical basis for multi-phase Wiener degradation model. Identification procedure for the transition points in the degradation path was proposed using maximum likelihood principle (MLP). The result of Kruskal-Wallis test which is the method to test whether two populations are consistent or not in statistics showed that the transition points are statistically effective. Other parameters in the multi-phase degradation model are estimated with maximum likelihood estimation (MLE) after the transition points have been specified. The multi-phase Inverse Gaussian (IG) distribution for storage life was deduced for the capacitor, and the point and interval estimation procedure for reliable storage life are constructed with bootstrap method. The efficiency and effectiveness of the proposed multi-phase degradation model is compared with storage life prediction under single-phase condition. 相似文献
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白伟 《吉林工程技术师范学院学报》2013,(7):89-92
设计了一种具有记忆功能的电子分控器,分控器在分步控制过程中彻底断电时,能可靠实时保存当前数据,而且不受断电时间限制。采用法拉电容作为MCU数据保存备用电源,解决了核心器件对锂电池的依赖,从根本解决了由于锂电池使用寿命短带来的弊端。通过实测检验、应用,分控器数据保存可靠实现了记忆功能。 相似文献
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通过对铁合金厂家实地调查,发现其所进行的无功补偿没有真正起到对整个系统的补偿,针对此情况进行了无功补偿方案的探讨,并且对并联电容器无功补偿中设备的选取和参数的选择进行了详细的分析,对铁合金厂家在进行无功补偿时,具有一定的参考价值。 相似文献
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李国敬 《长沙理工大学学报(社会科学版)》1988,(1)
状态变量法是近代对网络的过渡过程进行分析计算的一种重要方法,随着计算机的发展,日益获得重视。本文应用状态方程推导出TSC投入过程中电流、电容电压的变化规律。 相似文献
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陈璐 《湛江师范学院学报》2015,(3):43-47
通过自洽方法讨论了介观器件间的量子相干性对串联平行板介观电容器中电子含时输运性质的影响.结果表明量子相干性强烈依赖电容器极板间距和外部电压的频率.当极板间距较小或者高频段时,量子相干性对输运特性的影响尤为明显,说明在此类条件下,电流特性不遵循基尔霍夫定律. 相似文献
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陈天麒 《电子科技大学学报(社会科学版)》1989,(1)
本文详细地讨论了利用网络的关联矩阵和回路矩阵计算简并网络初始条件的系统算法,并给出了计算实例。本文所提出的算法简便易行,且便于用计算机进行计算。 相似文献
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康祝圣 《电子科技大学学报(社会科学版)》1988,(Z2)
本文提出了网络拓扑描述的一种新思想;阐述了新的拓扑矩阵之间的内在联系;首次建立了既适合开关电容网络,也适合开关变换器电路时域分析的统一方法——紧凑型改进节点法,该方法的特点在于网络方程的变量少,一般情况下方程系数矩阵中无主对角零元,本文还介绍了基于紧凑型改进节点法开发的周期性开关网络时域分析程序 PAPSN,它为模拟开关变换器路和电开关电容网络的瞬态特性提供了极为有用的工具. 相似文献
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运算放大器的动态频率补偿技术 ,是在带开关电容的运算放大器忽略了偏置电压的影响的情况下提出的 ,在这种情况下 ,有效地改善了低频小信号和高频大信号相对于传统的静态频率补偿技术的输出特性 相似文献