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.

公开(公告)号：DE69325411D1

公开(公告)日：1999-07-29

申请号：DE69325411

申请日：1993-03-25

Applicant: IBM

Inventor： GLADSTEIN LEO ALBERT ,  JONES CHRISTOPHER DANE ,  LEONTIADES KYRIAKOS ,  PATEL PARITOSH DINUBHAI ,  PETROSKEY PAUL WILLIAM

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.

公开(公告)号：CA2090707C

公开(公告)日：1998-04-28

申请号：CA2090707

申请日：1993-02-23

Applicant: IBM

Inventor： GLADSTEIN LEO ALBERT ,  JONES CHRISTOPHER DANE ,  PATEL PARITOSH DINUBHAI ,  PETROSKEY PAUL WILLIAM ,  LEONTIADES KYRIAKOS

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.

公开(公告)号：DE69325411T2

公开(公告)日：2000-01-20

申请号：DE69325411

申请日：1993-03-25

Applicant: IBM

Inventor： GLADSTEIN LEO ALBERT ,  JONES CHRISTOPHER DANE ,  LEONTIADES KYRIAKOS ,  PATEL PARITOSH DINUBHAI ,  PETROSKEY PAUL WILLIAM

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.

公开(公告)号：DE2842690A1

公开(公告)日：1979-05-10

申请号：DE2842690

申请日：1978-09-30

Applicant: IBM

Inventor： GLADSTEIN LEO ALBERT

IPC: G11C17/00 ,  G11C17/12 ,  G11C5/02 ,  H01L25/02

Abstract: The problem of a race condition in the precharged drain type FET read only storage circuits is avoided in the invention disclosed herein, by applying the bit decode signal to the source of the array device, so that the drain cannot be discharged through the FET array device unless both the bit line connected to the source and word line connected to the gate have on-signals. Thus, the memory circuit can be operated in a faster cycle because the word and bit signals may be made coincident.