Current controlled contact arc suppressor

Details Current controlled contact arc suppressor Current controlled contact arc suppressor

2005-10-18

2005-10-18

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

Reexamination Certificate

active

06956725

ABSTRACT:
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.

REFERENCES:
patent: 4420784 (1983-12-01), Chen et al.
patent: 4618906 (1986-10-01), Paice et al.
patent: 4652962 (1987-03-01), Howell
patent: 4704652 (1987-11-01), Billings
patent: 5652688 (1997-07-01), Lee

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