An electric fuse and protective circuit

H - Electricity – 01 – H

Patent

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Details

H01H 85/04 (2006.01) H01H 85/048 (2006.01) H05K 1/00 (2006.01) H01H 85/046 (2006.01) H05K 1/16 (2006.01) H05K 3/28 (2006.01)

Patent

CA 2159188

The present invention relates to an electric protective circuit comprising an electric fuse, including a solder (3), and an electric resistance loop (10) connected in series with the fuse (1), the fuse and loop being mounted on a substrate (11). The solder (3) will melt at elevated temperatures caused by heating of the substrate (11), and is surrounded by a material (8) which protects the solder (3) against the oxidizing effect of the surrounding air, and is applied in a region (9) surrounding the solder (3) and delimited by barrier walls (7), therewith enabling the solder (3) to contract onto the connecting terminals (4a, 4b) when it melts, therewith breaking the current path. The material (8) is temperature-stable in a solid state at normal fuse operating temperatures. The resistance loop (10) includes current-conducting paths (12) mutually connected with bridging elements (13), whose electrical resistance is much lower than the electrical resistance of the current- conducting paths (12), and trimming elements (14) for adjusting the resistance of the loop.

L'invention concerne un circuit de protection électrique comprenant un coupe-circuit électrique à fusible présentant une brasure (3), et un circuit fermé à résistance électrique (10) connecté en série avec le fusible (1), le fusible et le circuit fermé étant montés sur un substrat (11). La brasure (3) fond à des températures élevées dues à la chauffe du substrat (11), et est entourée d'un matériau (8) prévu dans une région (9) délimitée par des barrières (7) et conçu pour la protéger de l'effet oxydant de l'air ambiant. Lorsqu'elle fond, ladite brasure (3) se rétracte sur les bornes de connexion (4a,4b) et interrompt la voie suivie par le courant. Le matériau (8) est thermostable à l'état solide, aux températures de fonctionnement normales du fusible. Le circuit fermé à résistance (10) comporte des voies électro-conductrices (12) interconnectées à des éléments de pontage (13) dont la résistance électrique est nettement inférieure à celle des voies électro-conductrices (12), ainsi que des éléments de compensation (14) pour régler la résistance du circuit fermé.

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