Protection of an A.C. switch

Details Protection of an A.C. switch Protection of an A.C. switch

2005-12-13

2005-12-13

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C361S078000, C361S079000

Reexamination Certificate

active

06975122

ABSTRACT:
A circuit for detecting an overcurrent in an element in which an A.C. supply current flows, including a first comparator, assigned to the halfwaves of a first sign of the A.C. power supply, receiving on a reference input a first reference voltage setting a first one of the thresholds, a second comparator, assigned to the halfwaves of a second sign of the A.C. power supply, receiving on a reference input a second reference voltage setting a second one of the thresholds, and an input stage providing, to respective interconnected read inputs of the comparators, a voltage proportional to the voltage across the element, the stage including at least one first resistive element introducing a voltage drop between a first one of the terminals of the element and the read inputs.

REFERENCES:
patent: 4620258 (1986-10-01), Bloomer
patent: 4835652 (1989-05-01), Billings et al.
patent: 6256211 (2001-07-01), Milazzotto et al.
patent: 2001/0046143 (2001-11-01), Bruckmann et al.
patent: 196 22 679 (1996-12-01), None
patent: 0 009 649 (1980-04-01), None
French Search Report from French Patent Application No. 02/12428, filed Oct. 7, 2002.

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