Excess-current protection circuit and power supply

Details Excess-current protection circuit and power supply Excess-current protection circuit and power supply

2010-03-17

2011-10-18

Patel, Dharti (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093900

Reexamination Certificate

active

08040650

ABSTRACT:
An excess-current protection circuit includes an outer input terminal, an outer output terminal, a driver transistor connected between the input terminal and the output terminal to control an excess current, an excess-current control circuit, and an excess-current detection circuit. The excess-current control circuit compares a predetermined first bias voltage with a voltage obtained by a current flowing through a first sense transistor multiplied by a resistance value of a sense resistor and controls the gate voltage of the driver transistor in accordance with a comparison result. The excess-current detection circuit compares voltage difference between the drain and source of the driver transistor with a predetermined second bias voltage and controls the gate voltage of the driver transistor in accordance with a comparison result.

REFERENCES:
patent: 7339775 (2008-03-01), Kimura
patent: 4-32543 (1992-03-01), None
patent: 3498736 (2003-12-01), None
patent: 2005-333691 (2005-12-01), None

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