Battery charging unit

Details Battery charging unit Battery charging unit

1996-12-13

1999-03-30

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

320146, 320163, H02J 700

Patent

active

058893873

ABSTRACT:
A battery charging circuit, particularly useful in a laptop computer system, includes a voltage input terminal coupled to a dc voltage. A first switch couples the voltage input terminal to an output coupled to the battery through a current sense resistor. A first current sink which is on when the charger circuit is on draws current from the input side of the current sense resistor through a first resistor to develop a first voltage. This voltage and a voltage coupled through a second resistor from the battery side of the sense resistor are inputs to a comparator, the output of which controls the first switch. A second current sink, when on, draws current through the second resistor causing the first switch to be held off, turning the charging circuit off. An ON/OFF terminal, to which a variable duty cycle square wave is supplied, controls the turning on and off of the first and second current sinks, with the length of the duty cycle controlling the average current supplied to the battery.

REFERENCES:
patent: 4039920 (1977-08-01), Popp
patent: 4472672 (1984-09-01), Pacholok
patent: 4607208 (1986-08-01), Vreeland
patent: 5198743 (1993-03-01), McClure et al.
patent: 5698963 (1997-12-01), Seong et al.
patent: 5739667 (1998-04-01), Matsuda et al.

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