电源变换器中电解电容老化及寿命参数变化研究

P. Suskis, J. Zakis, A. Suzdalenko, H. Van Khang, Raimondas Pomarnacki
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引用次数: 0

摘要

电解电容器是现代电力电子中非常常用的元件。除了单位容量的高容量和单位容量的低价格等无可置疑的优点外,它们的可靠性相对较低,使用寿命有限。介绍了电解电容器的老化机理、参数随时间的变化以及人工老化的过程。这些元件的加速老化有助于发现与初始值相比ESR增长和电容退化的边界,以及老化后阻抗波德图的变化情况。所获得的数据对于开发电源变换器的诊断算法、高可靠性设计的设计考虑以及更好地理解电子设备的寿命估计是有用的。本文以小值电解电容器为例,给出了实际试验的数据。电容器加速老化使用过温和过压,该过程与参数测试交替进行,以充分说明未来设计中预期的过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study on Electrolytic Capacitor Aging in Power Converters and Parameter Change Over the Lifespan
Electrolytic capacitor is a very common element used in modern power electronics. Besides the undoubtable advantages as high capacity per volume and low price per capacity unit, they are relatively low reliability and limited lifetime. This paper describes the aging mechanisms, change of parameters over time and process of artificial ageing of electrolytic capacitors. The accelerated aging of these elements helps to discover the boundaries of ESR growth and degradation of capacitance in comparison to initial values, how changes the bode diagram of impedance over aging. The obtained data is useful for development of diagnostic algorithms for power converters, design considerations for high reliability designs and better understanding of lifetime estimation of electronic devices. The paper contains the data obtained from real tests made with electrolytic capacitors of small values as an example. Capacitor accelerated ageing is made using overtemperature and overvoltage, the process is alternated with tests of parameters to fully illustrate the processes expected in future designs.
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