Printed circuit card
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United States of America Patent
Stats
-
Oct 31, 2006
Grant Date -
Jan 12, 2006
app pub date -
Jul 11, 2005
filing date -
Jul 9, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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