Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1985-08-27
1988-08-23
Moore, David K.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315239, 315275, 315279, H05B 3700
Patent
active
047663529
ABSTRACT:
A low cost circuit addition in the form of a capacitor of suitable value provides effective starting and operation of rapid start, preheat, and instant start fluorescent type gas discharge lamps along with their standard A.C. operated ballast transformer auxiliary devices at reduced power levels to achieve energy conservation with a concomitant reduction in light output and can usefully employed in illuminated areas where a reduction in lighting level would not effect the utility of that particular area. The capacitor is connected in series with the ballast primary winding and is of such value as to cause ferro-resonance to occur in the ballast transformer primary circuit, thereby providing a voltage magnification effect to aid the lamp starting, or ignition, process i.e., during the time interval between circuit energization and production of a stable arc, and to thereafter operation of the lamp with reduced arc current.
REFERENCES:
patent: 3418527 (1968-12-01), Miller
patent: 3500128 (1970-03-01), Liepins
patent: 4082981 (1978-04-01), Morton et al.
patent: 4185233 (1980-01-01), Riesland et al.
patent: 4388564 (1983-06-01), Hammer
patent: 4399391 (1983-08-01), Hammer et al.
patent: 4523795 (1985-06-01), Johnson et al.
patent: 4553071 (1985-11-01), Boyd
Kelly, George "The Ferroresonant Circuit" 7/30/58 26-31, 1958 AIEE Fall Meeting, Pittsburgh, Pa.
Salihi, Jalal "Theory of Ferroresonance" Jan. 1960, AIEE and Air Transportation Conference, Seattle, Wash. 6/21/59.
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