Battery charging apparatus and method
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United States of America Patent
Stats
-
Nov 19, 1985
Grant Date -
N/A
app pub date -
Mar 31, 1983
filing date -
Mar 31, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery charging apparatus and method is disclosed. The battery charger includes a programmable two level constant current source having an inhibit input. A clock signal is fed to counting stages which time out after a specified time, during which time the battery is charged with constant current. A temperature sensing circuit detects the temperature of the charging battery and will allow the battery to charge at a reduced rate for a longer time period if the temperature increases above a threshold level. Once the counting stages time out, the battery charger pulse charges the battery at the reduced current level, preferably at a 20% duty cycle, at relatively long intervals to keep the battery from self discharging.
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