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Overcurrent Protection for Aluminum Electrolytic Capacitors

IP.com Disclosure Number: IPCOM000044908D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Butera, JJ: AUTHOR [+2]

Abstract

Excessive current through an aluminum electrolytic capacitor can cause the capacitor to explode, resulting in damage to equipment and a possible hazard to personal safety. This danger can be substantially eliminated by integrating a protective fuse into the capacitor.

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Overcurrent Protection for Aluminum Electrolytic Capacitors

Excessive current through an aluminum electrolytic capacitor can cause the capacitor to explode, resulting in damage to equipment and a possible hazard to personal safety. This danger can be substantially eliminated by integrating a protective fuse into the capacitor.

The figure shows a cross-sectional view of a typical aluminum electrolytic capacitor with a fuse as an integral part of the positive terminal. One implementation, A, of the fuse has a necked area which will melt when heated by a predetermined current below the level at which capacitor explosion is a substantial danger. Another implementation, B, could utilize one or more holes or slots in the fuse area. The key point is that the fuse area has a reduced cross- section or volume that will open when a predetermined overcurrent occurs. The fuse area may be encapsulated with silicone or other suitable material to contain possible arcing.

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