Electric lamp and discharge devices: systems – Pulsating or a.c. supply
Patent
1977-12-27
1979-10-09
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
315326, 315DIG7, H05B 4116, H05B 4124
Patent
active
041707460
ABSTRACT:
Miniature high pressure metal vapor lamps containing mercury in a discharge volume of one cubic centimeter or less when operated at low frequencies have extremely high reignition voltages; the problem is compounded in metal halide lamps, particularly during warm-up. Ballast designs capable of coping with these conditions at 60 Hz have disadvantages. The discovery of the existence of resonance-free regions in the frequency range between 20 and 50 KHz has made stable and efficient lamp performance possible through the use of compact, practical and economical high frequency ballasts.
REFERENCES:
patent: 4052636 (1977-10-01), Strok
Witting, "Acoustic Resonances in Cylindrical Hi-Pressure Arc Discharges," Journal of Applied Physics, Apr. 1978.
General Electric Company
Kempton Lawrence R.
La Roche Eugene R.
Legree Ernest W.
Neuhauser Frank L.
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