Electricity: battery or capacitor charging or discharging – Battery or cell charging – With detection of current or voltage amplitude
Reexamination Certificate
2008-09-30
2010-02-16
Assouad, Patrick J (Department: 2858)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With detection of current or voltage amplitude
C320S159000, C320S160000
Reexamination Certificate
active
07663346
ABSTRACT:
A battery charger for charging a battery through controlling a charging regulation circuit is provided. The battery charger includes a current sensing unit and an operational amplifier. The current sensing unit monitors a charging current applied to the battery when the battery charger operates under a constant current mode, thereby generating a first regulation signal to the charging regulation circuit. The operational amplifier compares a battery voltage of the battery with a first reference voltage to generate a comparison result. When the battery charger operates under the constant current mode, the comparison result controls a charging mode transition from the constant current mode to a constant voltage mode. When the battery charger operates under the constant voltage mode, the comparison result acts as a second regulation signal to control the charging regulation circuit.
REFERENCES:
patent: 5175485 (1992-12-01), Joo
patent: 5637981 (1997-06-01), Nagai et al.
patent: 7061210 (2006-06-01), Potanin et al.
patent: 7102415 (2006-09-01), Potanin et al.
Chen Pi-Fen
Wang Ying-Chung
Assouad Patrick J
Hsu Winston
Mediatek Inc.
Muralidar Richard V
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