Control loop for pulse charging lithium ion cells

Details Control loop for pulse charging lithium ion cells Control loop for pulse charging lithium ion cells

1997-08-19

1999-04-27

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

320137, H02J 700

Patent

active

058982949

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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