Charging circuit

Details Charging circuit Charging circuit

2007-05-09

2010-10-26

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S152000, C320S157000, C361S018000, C361S100000, C361S091100

Reexamination Certificate

active

07821233

ABSTRACT:
In a charging circuit charging a battery based on a power supply voltage from an external power supply, a charging transistor is provided on a path from the external power supply to the battery. A charging control circuit is integrated on a semiconductor substrate, and adjusts an ON state of the charging transistor to control a charging current supplied to the battery. The voltage adjusting circuit provided on an electric power supply path from the external power supply to a power supply terminal of the charging control circuit generates a necessary voltage drop. The current adjusting circuit adjusts the ON state of the charging transistor such that a voltage of the battery is brought close to a predetermined voltage value. The clamp circuit clamps a voltage at the power supply terminal of the charging control circuit below a predetermined clamp voltage.

REFERENCES:
patent: 5847544 (1998-12-01), Eguchi
patent: 2004/0164711 (2004-08-01), Hayashi
patent: 2005/0036246 (2005-02-01), Nagata et al.
patent: 2005/0168264 (2005-08-01), Fukami
patent: 8-149702 (1996-07-01), None
patent: 9-219935 (1997-08-01), None
Notification of Reason(s) for Refusal for Patent Application No. 2006-130453 with English translation mailed Apr. 13, 2010.

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