Battery charger and method of detecting a fully charged condition of a secondary battery
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United States of America Patent
Stats
-
Jan 1, 2002
Grant Date -
Jun 28, 2001
app pub date -
Dec 4, 2000
filing date -
Dec 3, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A battery charger is capable of accurately determining that a battery has reached a fully charged condition regardless of the kind of the batteries to be charged, the condition of the battery, battery temperature at the time when charging starts, charge current, and ambient temperature. A battery temperature is sampled at every predetermined timing, and a change in battery temperature rise gradient is computed each time the battery temperature is sampled. It is determined that the battery has reached the fully charged condition based on a transition changing from increment to decrement of the change in battery temperature rise gradient.
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