Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1986-12-19
1987-08-11
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315220, 315226, 315DIG4, 315DIG7, H05B 3702
Patent
active
046864270
ABSTRACT:
An electronic ballast system for operating fluorescent lamps at full and partial brightness is disclosed having a series reactance selectively switched into or out of the system by a reactance switch. The electronic ballast has an input filtering section, a voltage-clamped current source, and an oscillator whose frequency is determined in part by load reactance. Series filament capacitors provide lamp filament power control during starting and running at full and partial brightness.
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"The Verdict is in--" by Haver, EDN, Nov. 5, 1976, pp. 65-69.
Dixon Harold
Haurykiewicz John M.
MagneTek, Inc.
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