Arc interrupting lamp ballast

Details Arc interrupting lamp ballast Arc interrupting lamp ballast

1990-01-24

1991-09-24

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315219, 315DIG7, H05B 4136

Patent

active

050516671

ABSTRACT:
The lamp ballasting apparatus disclosed herein is of the high-frequency switching type which operates from a DC supply and effects pulse-width modulation to control the level of energization of the lamp. A common mode choke interposed between the lamp and the modulating means provides a series inductance opposing rapid common mode changes in the currents flowing through the lamp leads. A fast semiconductor switch is interposed in the lamp circuit. A current transformer inductively linked to the lamp leads generates a control signal having an amplitude which is a function of the difference of the current flowing in the leads and this control signal operates the switch when the current difference rises above a preselected level indicating an arcing condition.

REFERENCES:
patent: 3611102 (1971-10-01), Wallace
patent: 4700113 (1987-10-01), Stupp
patent: 4719390 (1988-01-01), Saivanen
patent: 4855860 (1989-08-01), Nilssen
patent: 4904903 (1990-02-01), Pacholok
patent: 4914356 (1990-04-01), Cockram
patent: 4952849 (1990-08-01), Fellows

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