Electric lamp and discharge devices: systems – Load device in the primary and secondary circuit of the...
Patent
1984-10-19
1987-09-15
Moore, David K.
Electric lamp and discharge devices: systems
Load device in the primary and secondary circuit of the...
315178, 315179, 315219, 315DIG7, 331113A, 331 62, H05B 3702
Patent
active
046942246
ABSTRACT:
A lighting apparatus for an electric discharge lamp includes a lighting ballast capacitor connected in series to an electric dicharge lamp for stabilizing a lighting current to the lamp; a preheating ballast capacitor connected in parallel to the lamp for supplying a preheating electric power to the lamp; electric power supply including an output transformer for supplying an electric power to the lighting ballast capacitor; a control electric power supply circuit for obtaining a control electric power through the lighting ballast capacitor and discharge lamp or the preheating ballast capacitor without adding a stepdown transformer or a resistive element for voltage drop; and an oscillator which receives the control electric power from the control power supply circuit and controls the electric power supply. With this lighting apparatus, the electric power loss is made small and the miniaturization of the apparatus can be realized.
REFERENCES:
patent: 2300429 (1942-11-01), Meacham
patent: 3566199 (1971-02-01), Kolster
patent: 3863125 (1975-01-01), Tollrian et al.
patent: 4005335 (1977-01-01), Perper
patent: 4045711 (1977-08-01), Pitel
patent: 4051445 (1977-09-01), Boschert
patent: 4189685 (1980-02-01), Doss
Akatsuka Mitsuo
Koyama Atsuo
Kuwahara Hideo
Nakagawa Hisato
Hitachi Lighting, Ltd.
Moore David K.
Razavi Michael
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