Control loop for pulse charging lithium ion cells
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United States of America Patent
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Apr 27, 1999
Grant Date -
N/A
app pub date -
Aug 19, 1997
filing date -
Aug 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Control circuitry is described for regulating charging current from a current source to a battery. The control circuitry includes a switch for transmitting the charging current from the current source to the positive terminal of the battery. A charge pump drives the gate terminal of the switch above the positive terminal voltage. A comparator stage with hysteresis gates the charge pump. A filtering stage senses the battery voltage and drives the comparator stage. The control circuitry controls the average value of the battery voltage by pulse width modulating the charging current.
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