Arc suppression circuit

摘要

An improved arc suppression circuit is disclosed for a switch having switch comprising a shunt circuit connected across the switch. A trigger circuit senses the voltage across the switch for actuating the shunt circuit when voltage across the switch contacts exceeds a predetermined level to reduce arcing current at the switch.

主权项

1. An arc suppression circuit for reducing arc at a contact, comprising:
an inductor; a first switch having switch contacts being movable between a first position and a second position; said first switch connected in series with said inductor; a second switch having switch contacts being movable between a first position and a second position; said second switch connected in parallel with said inductor; a shunt circuit connected across said second switch for shunting said switch contacts of said second switch; a trigger circuit for sensing voltage across said inductor for actuating said shunt circuit when voltage across said inductor exceeds a predetermined level to reduce arcing current at said switch; and a timing circuit comprising an integrator connected to a window comparator for delaying the closing of one of said first and second switches for a period after the opening of the other of said first and second switches.