Overcurrent protection circuit

Details Overcurrent protection circuit Overcurrent protection circuit

2007-05-15

2007-05-15

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093100, C361S093500, C361S093700, C361S096000, C361S097000

Reexamination Certificate

active

11181274

ABSTRACT:
The voltage generator circuit includes a regulator, a first sensor circuit, and a second sensor circuit. The first sensor circuit includes a first transistor, a first resistor, and an error amplifier. When V1>Vth, the error amplifier senses an overcurrent condition to provide feedback to the operational amplifier to limit an output current. The second sensor circuit includes a second transistor, a second resistor, and a sensing transistor. When the output current exceeds a sense threshold current, the sensing transistor is turned ON to provide feedback to the operational amplifier12to limit the output current. The second sensor circuit has a higher setting of sense threshold current than does the first sensor circuit, while having a higher setting of sensing speed than does the first sensor circuit.

REFERENCES:
patent: 4428015 (1984-01-01), Nesler
patent: 4476427 (1984-10-01), Kaneko et al.
patent: 4698712 (1987-10-01), Fritsch
patent: 5621601 (1997-04-01), Fujihira et al.
patent: 5739712 (1998-04-01), Fujii
patent: 5859757 (1999-01-01), Hanafusa et al.
patent: 5943204 (1999-08-01), Jones et al.
patent: 05-315852 (1993-11-01), None

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