Method and apparatus for end of discharge indication based on critical energy requirement
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United States of America Patent
Stats
-
Jan 13, 2004
Issued Date -
N/A
app pub date -
Dec 19, 2001
filing date -
Oct 19, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A battery monitoring system and method in accordance with the principles of the present invention, a capacity of interest is determined. This capacity of interest is the useful battery capacity required for an operation of interest; that is, the battery capacity at the discharge rate required for the operation of interest. The operation of interest may be a save-to-disk operation during a battery operated computer shutdown or a shutdown procedure for a personal digital assistant, for example. Given the capacity of interest, alarm settings are determined for a variety of voltage, discharge, and, optionally, temperature conditions. The trip points map, or index, voltage and discharge rate information for one or more discharge rates to one or more capacities of interest. When an indexed battery-voltage/discharge-rate combination that corresponds to the capacity of interest is encountered, an alarm may be set to indicate that, although the present voltage and discharge rates may indicate that there is more or less capacity than required for the critical operation, the capacity of interest (useful energy left at the discharge rate of interest) has been encountered.
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