Static information storage and retrieval – Powering – Data preservation
Patent
1995-01-25
1997-02-18
Zarabian, A.
Static information storage and retrieval
Powering
Data preservation
365226, G11C 1140
Patent
active
056047088
ABSTRACT:
A fail-safe system for monitoring the voltage of a backup battery of a portable computer system to prevent excessive drainage of the backup battery. The backup battery is primarily provided to maintain voltage to the configuration memory of the portable computer during swapping of the main battery. A timing circuit allows the backup battery to provide power to other, low power system components for a limited time, such as two minutes, while the main battery is being replaced. In the fail-safe circuit, a comparator circuit monitors the voltage of the backup battery and asserts a signal in the event its voltage falls to a predetermined minimum level. A switch circuit correspondingly disconnects the backup battery from the other system components, thereby conserving the energy of the backup battery. Thus, if the timing circuit should fail or if the energy of the backup battery is too low, the fail-safe system prevents excessive drainage of the backup battery to maintain sufficient energy for the configuration memory.
REFERENCES:
patent: 4451742 (1984-05-01), Aswell
patent: 4712196 (1987-12-01), Uesugi
patent: 4884242 (1989-11-01), Lacy
patent: 4907183 (1990-03-01), Tanaka
patent: 5007027 (1991-04-01), Shimoi
Brown Alan E.
Helms Frank
Dell USA L.P.
Zarabian A.
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