Device for determining the charge condition of a battery
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United States of America Patent
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Sep 1, 1992
Issued Date -
N/A
app pub date -
Nov 13, 1990
filing date -
Oct 25, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for determining the charge condition of a battery (10) comprises a current-frequency converter (50) which generates pulses of a frequency is dependent on the battery charge or discharge current. These pulses are counted and are used for computing the battery charge condition. In order to indicate a correct relative charge condition, especially in the case of a battery capacity which has changed due to, for example, ageing, the device comprises detection means (53) which detects an actual battery charge condition and correction means (52) for correcting the charge condition computed by a computing means (51). In one embodiment the correction means are integrated with the current-frequency converter and the frequency of the generated pulses is adapted to the present capacity of the battery.
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