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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
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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2.发明专利
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
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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Patent Agency Ranking
公开(公告)号：DE69331204D1
公开(公告)日：2002-01-10
申请号：DE69331204
申请日：1993-03-23
Applicant: IBM
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公开(公告)号：DE69331204T2
公开(公告)日：2002-08-08
申请号：DE69331204
申请日：1993-03-23
Applicant: IBM
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公开(公告)号：DE69009285D1
公开(公告)日：1994-07-07
申请号：DE69009285
申请日：1990-03-07
Applicant: IBM
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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
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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公开(公告)号：DE69009285T2
公开(公告)日：1994-12-08
申请号：DE69009285
申请日：1990-03-07
Applicant: IBM
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