Current controlled contact arc suppressor

Details Current controlled contact arc suppressor Current controlled contact arc suppressor

H - Electricity

02

H

H02H 3/00 (2006.01) H01H 9/54 (2006.01)

Patent

CA 2499568

The arc suppression system for electrical contacts includes a transistor, such as an IGBT, which is connected across the contacts. A control circuit controls the operation of the transistor such that the turning on of the transistor results in a current path around the contacts, thereby tending to prevent arcing across the contacts. A current sensor, such as a flyback transformer, is positioned in series with the contacts, wherein when the contacts open, current is interrupted through the contacts and the transformer, a secondary voltage results which is applied to the transistor, which tends to maintain the transistor on for a time which is sufficient to allow the contacts to either open or close without an arc.

Ce système d'extinction d'arcs pour contacts électriques comprend un transistor, un IGBT par exemple, qui est connecté entre les contacts. Un circuit de commande gère le fonctionnement du transistor de telle sorte que l'activation dudit transistor se traduit par un chemin de courant autour des contacts, ce qui a tendance à empêcher la formation d'arcs entre ces contacts. Un détecteur de courant tel qu'un transformateur de balayage horizontal est monté en série avec les contacts. Lorsque les contacts s'ouvrent, le passage du courant est interrompu dans ces contacts et dans le transformateur, une seconde tension se crée qui est appliquée au transistor et tend à le maintenir enclenché pendant un laps de temps suffisant pour permettre aux contacts soit de s'ouvrir, soit de se fermer, en l'absence d'arc.

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