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    SYSTEM FOR DISTRIBUTED POWER MANAGEMENT IN PORTABLE COMPUTERS
    1.
    发明专利
    SYSTEM FOR DISTRIBUTED POWER MANAGEMENT IN PORTABLE COMPUTERS 未知

    公开(公告)号：CA2087767C

    公开(公告)日：1998-05-05

    申请号：CA2087767

    申请日：1993-01-21

    Applicant: IBM

    Inventor： LEE NATHAN J ,  NOVAK FRANK P ,  LEONTIADES KYRIAKOS ,  KANNAN KRISHNAMURTHI ,  SHARMA VIKRAM ,  JONES CHRISTOPHER D

    IPC: G06F1/26 ,  G06F1/28 ,  G06F1/30 ,  G06F1/32 ,  G06F9/30

    Abstract: The present invention provides a system and method for managing power in a portable, pen-based notebook computer. The system and method provides a means for minimizing power consumption by collecting and interpreting power related data at various processing elements while hiding many of the details from the end-user. The present invention is a system and method for monitoring, collecting and acting upon power-related data in portable computer to maximize the amount of time the portable computer can be used between battery re-charging with minimal user intervention. The present invention is comprised of a plurality of independently controllable power planes which are selectively powered so that the portable computer consumes the minimum power necessary to perform a particular function and a plurality of central processing units (CPUs) operating asynchronously with respect to each other. The present invention is further comprised of an on/off glue logic means for monitoring battery condition, user invoked functions, and system state and a power management means for controlling the operation of each of the CPUs as a function of the conditions sensed by the sensing means.

    BATTERY OPERATED COMPUTER HAVING IMPROVED BATTERY GAUGE AND SYSTEM FOR MEASURING BATTERY CHARGE
    3.
    发明专利
    BATTERY OPERATED COMPUTER HAVING IMPROVED BATTERY GAUGE AND SYSTEM FOR MEASURING BATTERY CHARGE 未知

    公开(公告)号：CA2090707A1

    公开(公告)日：1993-10-17

    申请号：CA2090707

    申请日：1993-02-23

    Applicant: IBM

    Inventor： GLADSTEIN LEO ALBERT ,  JONES CHRISTOPHER D ,  LEONTIADES KYRIAKOS ,  PATEL PARITOSH D ,  PETROSKEY PAUL W

    IPC: G06F1/26 ,  G01R31/36 ,  G06F1/28

    Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller. A battery supplies the primary power for operating the computer but the computer is also connectable to an external source of DC power to charge the battery and to operate the computer when it is not running on battery power. The service processor includes a battery gauge the contents of which indicate how much power is left in the battery and how much time remains at the current rate of power consumption before the power runs out. The amount of remaining power in the gauge is determined by keeping track of power consumed, power added, and power lost during off periods. The use of the second derivative of a voltage versus time discharge curve creates a point from which relative accurate estimates can be made of how much longer the computer can be operated.

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