Method and apparatus for charging batteries
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United States of America Patent
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Oct 21, 1997
Grant Date -
N/A
app pub date -
Mar 26, 1996
filing date -
Mar 26, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A charger for charging a rechargeable battery. The charger comprising a circuit for producing a charging current having a variable level and a control circuit for controlling the charging current. During a first charging period the current is maintained at a level to rapidly charge the battery at a rate in amperes which is greater than the capacity of the battery in ampere-hours. The controller includes means for interrupting the charging current for a predetermined interruption interval. During the interruption interval, the charging current is maintained at a non-zero value. The controller also includes means for determining a resistance free voltage for the battery. During a subsequent charging period, the charging current is controlled in response to the value of the resistance free voltage.
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