Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1982-04-12
1984-04-03
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315220, 315223, 315224, 315DIG2, 315282, 315DIG4, H05B 3702
Patent
active
044410549
ABSTRACT:
A stabilized dimming circuit for an electronic ballast system. The dimming circuit includes a transformer having a variable inductance primary included as a part of a feedback loop comprising a push-pull inverter and an output transformer for supplying a drive signal to a lamp filament. As the inductance of the primary is varied (decreased), the amount of feedback applied to the inverter is varied (increased) and the lamp brightness dimmed accordingly. The secondary of the dimming transformer is included in a loop that is completed by a secondary winding of the output transformer and a lamp filament. Because the voltage induced in the secondary of the dimming transformer is held relatively constant, the voltage applied to the filament is stabilized in spite of varations in the amount of power supplied to the lamp.
REFERENCES:
patent: 2830232 (1958-04-01), Carpenter et al.
patent: 4127795 (1978-11-01), Knoll
patent: 4353009 (1982-10-01), Knoll
Dixon Harold
GTE Products Corporation
Odozynski John A.
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