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Battery Backup Failure Detection Disclosure Number: IPCOM000047389D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07

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Desautels, JC Temple, JL [+details]


In any functional unit, normally mains powered but equipped with a battery for maintaining data integrity during power failure for at least key areas that are volatile, a mechanism can be provided that will provide an adequate test of the effectiveness of the battery operation during power down without the use of a conventional capacitor system. The mechanism comprises a dedicated data storage area, capable of being selectively read and written when power is up, forming part of the data storage areas protected by the battery and of the same nature. This dedicated area is loaded, when power is up, with predetermined data and is tested, after each power down, to determine whether or not it still holds the predetermined data. While not theoretically conclusive, the mechanism provides an adequate and practical test.