Printed circuit card

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location

Reexamination Certificate

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Details

C324S551000

Reexamination Certificate

active

07129710

ABSTRACT:
A printed circuit card made of plastic has a carbonization sensor for protection against smoldering electrical fires. The carbonization sensor contains a first and a second conductor track disposed on the printed circuit card and also a monitoring device. The two conductor tracks are electrically insulated from one another by the plastic, and the monitoring device monitors an insulating state of the two conductor tracks in relation to one another and produces a fault signal. Local overheating of the printed circuit card is detected at an early time by the carbonization sensor, before an avalanche effect caused by the carbonization, which makes the printed circuit card electrically conductive, leads to a smoldering electrical fire.

REFERENCES:
patent: 4504782 (1985-03-01), Zbinden
patent: 4567428 (1986-01-01), Zbinden
patent: 6040530 (2000-03-01), Wharton et al.
patent: 2005/0275552 (2005-12-01), Chamberlin et al.
patent: 199 10 407 (2000-09-01), None
patent: 299 23 733 (2001-03-01), None
patent: 0 926 930 (1999-06-01), None
patent: 2 314 699 (1998-01-01), None
patent: 7-321427 (1995-12-01), None

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