USB charger circuit

Details USB charger circuit USB charger circuit

2008-03-30

2011-12-06

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

C320S107000, C320S162000, C320S164000

Reexamination Certificate

active

08072186

ABSTRACT:
A USB charger circuit includes at least a converter, a control circuitry, a first resistor, a second resistor, an error amplifier, a sense resistor and a diode. The converter has a transistor. The control circuitry is coupled to the transistor. The control circuitry is used for producing a drive signal to the transistor. The first resistor is connected between the output node of the converter and a first node. The second resistor is connected between the first node and a second node. The error amplifier is coupled to receive a voltage divided by the first resistor and the second resistor to compare to a reference voltage. The sense resistor is connected between the second node and ground. The diode is connected between the output node of the converter and a first node.

REFERENCES:
patent: 6184652 (2001-02-01), Yang
patent: 2006/0002154 (2006-01-01), Amrani et al.

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