Battery charger and charging method

Details Battery charger and charging method Battery charger and charging method

2005-10-11

2005-10-11

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

Reexamination Certificate

active

06954051

ABSTRACT:
The charging method includes the steps of charging a battery pack, sensing voltage of the battery pack, calculating voltage change rate, detecting a first inflection point based on the voltage change rate so long as a voltage step is not detected, detecting a second inflection point based on the voltage change rate so long as a voltage step is not detected, and reducing current sent to the battery pack when both first and second inflection points have been detected.

REFERENCES:
patent: 5633574 (1997-05-01), Sage
patent: 5998968 (1999-12-01), Pittman et al.
patent: 6130522 (2000-10-01), Makar
patent: 6154011 (2000-11-01), Lam et al.
patent: 6242889 (2001-06-01), Belyo
patent: 6791300 (2004-09-01), Trinh et al.

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