Smart battery charging system, charging method therefor and power supply system for portable computer using the same
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United States of America Patent
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Feb 15, 2000
Grant Date -
N/A
app pub date -
Aug 24, 1998
filing date -
Aug 25, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a smart battery charging system, a charging method therefor and a power supply system for portable computer using the same that executes various charging operations securely corresponding to types of the smart batteries connected to the notebook computer. A smart battery charger 60 supplies charging voltage and charging current to the smart battery 70 selectively by controlling data input through an SM bus. The smart battery charger 60 and the smart battery 70 are connected to a keyboard controller 80 through the SM bus. The keyboard controller 80 determines the power on-off status of the notebook computer, based on second power voltage outputted from an SMPS 130, and identifies the types of the smart batteries, based on battery identifying signals outputted from the smart battery charger 60. The system controls the smart battery charger 60 appropriately based on the above detecting results and status data of the smart battery 70, thus charging the smart battery 70 stably and optimally. A constant voltage regulating circuit 150 supplies operational powers to the keyboard controller 80, regardless of the power on-off and external power source.
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