Charging control circuit and charging device including...

Details Charging control circuit and charging device including... Charging control circuit and charging device including...

2008-05-13

2008-05-13

Tso, Edward H (Department: 2838)

Electricity: battery or capacitor charging or discharging

Diverse charging or discharging rates for plural batteries

Reexamination Certificate

active

07372235

ABSTRACT:
A charging control circuit according to an embodiment of the present invention includes a detecting circuit and a charging transistor control unit for controlling a charging transistor supplying a first current, a current source for supplying a second current, and a current source control unit for controlling the current source. For example, if a secondary battery is charged using an adaptor endowed with a current-limiting function, during a constant-current charging period in which a charging voltage of the secondary battery reaches 3.2 V to 4.2 V, the secondary battery is charged with the first current I1, and during a constant-voltage charging period after the voltage reaches 4.2 V, the secondary battery is charged with the first charging current and the second charging current.

REFERENCES:
patent: 2005/0242777 (2005-11-01), Van Beek et al.
patent: 9-084276 (1997-03-01), None

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