卫星用电容器的性能、特点和应用可靠性

PERFORMANCES FEATURES AND APPLIED RELIABILITY OF SATELLITE-USED CAPACITORS

介绍星用电容器选用要点、失效实例，以及如何提高固但、液但、陶瓷电容器的应用可靠性。还谈及四个问题：①固钽不能用在电源滤波器中；②因钽的可靠性与使用线路阻抗有关，如果线路阻抗越小则可靠性越差；③液钽易发生振动失效，有些在振动激励下可能成为瞬息电势源（间歇短路）；④多层陶瓷电容器的低压失效。分析了这些特殊失效现象及失效机理，提出可能采用的筛选方法。

This paper presents the selection rules of satellite-used capacitors failure examples and the methods of raising applied reliability of tantalum capacitors.Four viewpoints are put forward:①Solid state tantalum capacitors should not he used in power supply filters;②The reliability of solid state tantalum capacitors is related to the serial resistance in a circuit;③Liquid state tantalum capacitors are susceptible to vibration, and it is possible to produce transient electric potential;④ There is low voltage failure in multi-lager ceramic capacitors.Finally by analysing the special failure phenomenon and mechanism of capacitors, some available screening methods are proposed.