基于耗损失效模型的金属化膜脉冲电容器可靠性评估
Reliability assessment of metallized film capacitors using degradation failure model
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摘要: 高储能密度金属化膜脉冲电容器是惯性约束聚变装置的关键元器件，由于其“自愈”特性，在短时间内很难得到它的失效数据。通过分析电容器的失效机理，给出了金属化膜脉冲电容器的一个耗损失效模型，推导了该模型的失效概率密度函数和分布函数，并利用电容器的性能衰退数据对其进行了可靠性分析。所选的某型金属化膜脉冲电容器未知参数估计值为0.000 119 4和0.006 7，将该值代入失效分布函数和概率密度函数中，从而确定电容器的失效模型，由此模型求得该型电容器充放电10 000次的可靠度为0.988 5，预计寿命为23 461次充放电。在工程实践中使用该模型对该型电容器进行可靠性分析可节约大量的试验成本。Abstract: The metallized film pulse capacitor is a key component of the inertial confinement laser fusion facility. For the high reliability capacitors, it is difficult to assess the reliability by using the traditional time-to-failure analysis method. By analyzing degradation mechanism of the metallized film capacitor, this paper presents a degradation failure model in which parameters can be estimated from the performance degradation measures of the capacitor. The estimation values of the unknown parameters in this model are 0.000 119 4 and 0.006 7, respectively. Both the failure probability density function (PDF) and the cumulative distribution function (CDF) can be presented by this degradation failure model. Based on these estimation values and the PDF/CDF, the reliability model of the metalliz
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