Device for detecting residual capacity of battery
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United States of America Patent
Stats
-
Jul 18, 1989
Grant Date -
N/A
app pub date -
Mar 15, 1988
filing date -
Mar 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for detecting the residual capacity of a battery comprises a battery current measuring circuit for measuring battery current, a battery voltage measuring circuit for measuring battery voltage, a converting circuit for converting the measured current into a voltage value, based on the internal impedance of the battery, and a comparator circuit for comparing the conversion voltage value with the measured voltage. When the measured voltage is smaller than the conversion voltage value, the comparator circuit operates a battery residual-capacity detect signal indicating that the residual capacity of the battery is small.
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