Dual battery pack charging in a computer system

Details Dual battery pack charging in a computer system Dual battery pack charging in a computer system

1997-07-29

1999-09-21

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

320160, H02N 700

Patent

active

059558679

ABSTRACT:
A system for charging dual battery packs. The system includes a charger for supplying current to charge a first battery pack when the first battery pack is electrically coupled to the computer system. The charger supplies current to charge a second battery pack when the second battery pack is electrically coupled to the computer system. The system also includes a charge controller, such as a keyboard controller executing a program stored in a memory, for controlling the charging of the first battery pack and the second battery pack such that the charger charges the first battery pack to a first level, the charger charges the second battery pack to a second level, and the charger simultaneously charges the first battery pack and the second battery pack when the first battery pack is charged above the first level and below a third level and the second battery pack is charged above the second level and below a fourth level. Each battery pack includes a processor, an associated memory, back to back FETs, and lithium ion cells.

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U.S. Patent Application entitled "Dual Smart Battery Detection System for Portable Computers", filed May 6, 1997, John Cummings, Jim Leftwich, Serial No. 08/851,781.

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