Battery Charger and method for simultaneously charging multiple

Details Battery Charger and method for simultaneously charging multiple Battery Charger and method for simultaneously charging multiple

1995-09-29

1998-05-26

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Time control

H01M 1046

Patent

active

057571635

ABSTRACT:
A battery charger for simultaneously charging a plurality of batteries from a single power source includes a microcontroller-based circuit that is programmed to multiplex full charging current sequentially to each battery in the charger. Charge termination in the preferred embodiment is determined by monitoring total charge time and by detecting a predetermined drop in battery voltage--i.e., "minus .DELTA.V". The microcontroller is programmed to individually track the actual charge time of each battery in the charger and to adjust the clock rate of each battery accordingly when multiple batteries are charged at the same time. In addition, the minus .DELTA.V charge termination criteria is temporarily disabled for any battery in the charging process when one or more batteries are inserted into the charger to prevent erroneous detection of a full charge condition.

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