Variable frequency current control device for discharge lamps

Details Variable frequency current control device for discharge lamps Variable frequency current control device for discharge lamps

1985-10-11

1987-10-06

Moore, David K.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315205, G05F 100

Patent

active

046985549

ABSTRACT:
A variable frequency current control circuit for one or more discharge lamps comprises a push-pull oscillator inverter having an inductance in the DC supply, a non-resonant coupling circuit for coupling the output of the oscillator inverter to the lamp (or lamps) and cycle-by-cycle frequency control of the oscillator in response to a lamp current sensor thereby to automatically control the impedance of the lamp ballast in a sense to regulate the lamp current.

REFERENCES:
patent: 3611021 (1971-10-01), Wallace
patent: 4060752 (1977-11-01), Walker
patent: 4221994 (1980-09-01), Friedman et al.
patent: 4346332 (1982-08-01), Walden
patent: 4415839 (1983-11-01), Lesea
patent: 4471269 (1984-09-01), Ganser et al.
patent: 4498031 (1985-02-01), Stupp et al.

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