Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
2004-12-30
2009-06-16
Ullah, Akm E (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S128000
Reexamination Certificate
active
07548041
ABSTRACT:
A power management system including a battery-powered application, in which an input current is supplied by a source of current that may be a current-constrained source, such as a USB port, to a battery for charging the battery and to an application load. Battery charging current is supplied to the battery for a period of time based on magnitude of battery charging current, so that charging current of lesser magnitude is applied to the battery for a greater period of time. In accord with one implementation, battery charging current is determined by monitoring the difference between a programmed charging current, dependent on battery type, and magnitude of current used by the load. Change of battery charging current due to voltage mode charging, when charge current begins to drop as the battery approaches full charge, is detected, and in response, the charging period is set to a fixed charging period based on the battery.
REFERENCES:
patent: 4668901 (1987-05-01), Furukawa
patent: 4755733 (1988-07-01), Laliberte
patent: 4755735 (1988-07-01), Inakagata
patent: 4779035 (1988-10-01), Engelmann
patent: 5363312 (1994-11-01), Ninomiya
patent: 5576608 (1996-11-01), Nagai et al.
patent: 5606240 (1997-02-01), Kokuga et al.
patent: 5818202 (1998-10-01), Miyamoto et al.
patent: 6300744 (2001-10-01), Shum
patent: 6459239 (2002-10-01), Price
patent: 6617826 (2003-09-01), Liao et al.
patent: 7221977 (2007-05-01), Weaver et al.
patent: 2002/0130638 (2002-09-01), Sherman
Garmin International, Inc. Non-Disclosure Agreement, Sep. 29, 2004.
Research in Motion Limited (RIM) Non-Disclosure Agreement, Jun. 1, 2002.
Apple Non-Disclosure Agreement, May 10, 2005.
Bell David B.
Zemke Roger A.
Linear Technology Corporation
McDermott Will & Emery LLP
Tran Nguyen
Ullah Akm E
LandOfFree
Power management circuit and methodology for battery-powered... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power management circuit and methodology for battery-powered..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power management circuit and methodology for battery-powered... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4074222