Failure analysis method for solid tantalum electrolytic capacitor with built-in fuse

Abstract

The invention provides a failure analysis method for a solid tantalum electrolytic capacitor with a built-in fuse. The method comprises steps of observing the appearance and internal structure of thecapacitor, and determining the position and a welding state of the fuse; testing electrical parameters of the capacitor, and preliminarily determining a failure mode of the capacitor and whether a fuse and welding are normal or not according to the electrical parameters; mechanically removing an encapsulating material around the fuse, testing first resistance between electrodes at two ends of thefuse, desoldering the fuse, testing second resistance at the two ends of the fuse, and verifying whether the fuse and welding are normal or not according to the first resistance and the second resistance; chemically unsealing the desoldered capacitor, and observing the morphology of an exposed tantalum core; and determining a capacitor failure reason according to the result of each step. The method is advantaged in that a fuse state and a welding state can be accurately determined, preliminary confirmation and verification are carried out before and after unsealing, and the capacitor failure reason can be efficiently and accurately analyzed.

Description

technical field [0001] The invention relates to the technical field of capacitor failure analysis, in particular to a failure analysis method for a solid tantalum electrolytic capacitor with a built-in fuse. Background technique [0002] Solid tantalum electrolytic capacitors are formed by pressing tantalum powder and sintering in a high-temperature furnace to form an anode body. The dielectric is to put the anode body into acid to form a porous amorphous Ta 2 o 5 Dielectric membrane, the working electrolyte can be MnO 2 Or high molecular polymer, and then connected to the cathode through the graphite layer; the failure of solid tantalum electrolytic capacitors is the same as that of other types of capacitors, and there are three types of failures: electrical parameter change failure, short circuit failure and open circuit failure. [0003] At present, with the continuous improvement of the overall performance of military electronic equipment with reliability requirements,...

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to propose a failure analysis method for solid tantalum electrolytic capacitors with built-in fuses, so as to solve the problem of unidentifiable fuses in existing analysis methods failure mode problem

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