Electric lamp and discharge devices: systems – Automatic substitution of the power supply
Patent
1977-10-14
1979-06-19
Smith, Alfred E.
Electric lamp and discharge devices: systems
Automatic substitution of the power supply
315 96, 315 99, 315DIG2, 315DIG5, 315DIG7, H05B 3700, H05B 4129
Patent
active
041587928
ABSTRACT:
A light control device for a high frequency lighted fluorescent lamp includes a high frequency variable voltage power source. A first impedance element (a capacitor and inductor in series) is provided between the terminals of the lamp on the side opposite to the power source. A second impedance element (an inductor) is connected between the power source and the terminals of the lamp, and a third impedance element (a capacitor) is connected across the lamp on the power source side. A constant power source circuit supplies, upon starting of the lamp, constant power to the first impedance element to thereby apply substantially constant cathode pre-heating current and starting voltage and applies, during the lighting of the lamp, substantially constant cathode heating current. The control circuit is capable of pre-set light control. The light control device suppresses beat interference and fluorescent lamp noises due to the electric field radiated from the lamp. Rapid and instant starting is enabled. The solid state ballast is suitable for fluorescent lamp appliances for domestic use and permits use as an emergency lamp.
REFERENCES:
W. Elenbass, High Pressure Mercury Vapour Lamps & Their Applications, Philips Technical Library, 1965, pp. 98-100.
W. Elenbass & T. Hehenkamp, "A New Fluorescent Lamp in a Starterless Circuit", Philips Technical Review, vol. 17, No. 10, Apr. 1956, pp. 288-293.
P. D. Parker, "A Review of the Developments of Ballasts & Circuits for Operating Discharge Lamps", Lighting Research and Technology, vol. 1, No. 4, 1969, pp. 199-234.
IES Lighting Handbook, 5th edition, Illuminating Engineering Society, 1972, pp. 8-32 & 8-120.
Hatada Masamichi
Kuroi Hisashi
Morita Kumio
Tanaka Eiji
Kuroi Kosan Kabushiki Kaisha
Roberts Charles F.
Semmes Raphael
Smith Alfred E.
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