Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1998-06-22
1999-11-09
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
320164, H02J 700
Patent
active
059821485
ABSTRACT:
A battery charger monitors the terminal voltage of a secondary battery connected thereto with no appreciable depletion of the battery energy. Upon the completion of the charge cycle, the battery charger monitors the terminal voltage of the battery by first creating a high impedance node at the battery low side, and then regulating the battery high side voltage to a value below the maximum allowable terminal voltage for the battery. The battery low side voltage will decreases in response to a value below ground. The charger monitors the terminal voltage across the battery by measuring the battery low side voltage When the battery charger detects that the battery has discharged to a predetermined capacity level, the charger initiates a charge maintenance mode. The battery charger either refreshes the battery or maintains the battery at the predetermined capacity level.
REFERENCES:
patent: 5530336 (1996-06-01), Eguchi et al.
patent: 5631537 (1997-05-01), Armstong
Product information, "Benchmarq bq2054 Lithium Ion Fast Charger", Sep., 1996, 14 pages.
Cook Carmen C.
Kwok Edward C.
National Semiconductor Corporation
Shin K.
Wong Peter S.
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