Charging circuit of portable device

Details Charging circuit of portable device Charging circuit of portable device

2011-01-11

2011-01-11

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Reexamination Certificate

active

07868593

ABSTRACT:
A charging circuit of a portable device includes a switch circuit having an input connected to a storage battery of the portable device for triggering the storage battery to supply power to an electronic device, a reference voltage circuit, a regulating circuit, a filter circuit filtering voltage signals from the storage battery, a collecting circuit, a comparator circuit, a rectangular generator, an integral circuit, and a driving circuit. The reference voltage circuit and the collecting circuit respectively output a reference voltage signal and a collecting voltage signal to the comparator circuit. The rectangular wave generator outputs a rectangular wave to the integral circuit. The integral circuit outputs a triangle wave signal to the driving circuit. The driving circuit outputs a pulse width modulation (PWM) signal to drive the regulating circuit to charge the electronic device.

REFERENCES:
patent: 4484256 (1984-11-01), Hartman
patent: 6144187 (2000-11-01), Bryson
patent: 6597221 (2003-07-01), Hall et al.
patent: 2002/0128690 (2002-09-01), Zarinetchi et al.

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