Patent ID: 6483678
Filing Date: 2002-11-19
Classification: H01J

Abstract:
An arc extinguishing circuit comprising:a switch element equipped with a control terminal and two input/output terminals, with conduction across said two input/output terminals being based on a voltage inputted to said control terminal; a sense circuit, being a circuit having a primary winding and a voltage sense capacitor connected in series, with one end thereof connected to one input/output terminal and a remaining end thereof connected to said remaining input/output terminal; a secondary winding being magnetically coupled with said primary winding and having one end connected to said control terminal and a remaining end connected to one of said input/output terminals, wherein a voltage at said secondary winding is capable of being induced to have said switch element short circuit said input/output terminals so as to extinguish arc discharge when said arc discharge occurs between said input/output terminals; and a d.c. voltage generating circuit and a voltage limiting circuit, said d.c. voltage generating circuit being connected to said one end of said sense circuit, and said voltage limiting circuit being connected to said remaining end of said sense circuit.