Diagnostics of Pre-Fault Conditions Using The Impact of Electrolytic Capacitor Aging on Power Supply Dynamics

P. Suskis, J. Zakis, A. Suzdalenko, H. Van Khang, Raimondas Pomarnacki
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Abstract

The modern power electronics is indistinctive to questions on a reliability. The electrolytic capacitors despites their excessive properties in terms of affordability, power density to volume and weight, remains an element that can cause device fail. The paper is dedicated to a solution to diagnostics, monitoring and prediction of remain lifetime of electrolytic capacitors. The main idea is that ESR (Equivalent Series Resistance) of capacitor grows while capacitor is getting to the end of the lifespan. ESR in combination with the capacitance is forming a Left Half-Plane zero and thus change in listed parameters is affecting overall transfer function. This paper uses buck converter as an example. The data for capacitors models is obtained from real accelerated aging experimental results. Modelling at different lifespan periods shows change in response to disturbance. The paper proposes to use band-pass filter to get signal that is easy to process further. The paper also has a little discussion on potential uses of the signal and their advantages and disadvantages.
利用电解电容老化对电源动力学的影响诊断故障前状态
现代电力电子技术在可靠性问题上是没有区别的。尽管电解电容器在可负担性、体积和重量的功率密度方面具有过高的性能,但仍然是可能导致设备故障的因素。本文致力于电解电容器剩余寿命诊断、监测和预测的解决方案。主要思想是电容器的ESR(等效串联电阻)随着电容器寿命的结束而增加。ESR与电容结合形成左半平面零,因此所列参数的变化影响整体传递函数。本文以buck变换器为例。电容器模型数据来源于实际加速老化实验结果。不同寿命期的模型显示了对干扰的响应变化。本文提出采用带通滤波器来获得易于进一步处理的信号。本文还讨论了该信号的潜在用途及其优缺点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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