Electric lamp and discharge devices: systems – Plural load device systems – Sequential starting
Patent
1976-01-06
1977-02-01
La Roche, Eugene
Electric lamp and discharge devices: systems
Plural load device systems
Sequential starting
315227R, 315250, 315254, 315324, 315DIG5, H05B 41232, H05B 41234
Patent
active
040063844
ABSTRACT:
Lead-lag, series-sequence starting and operating apparatus for three to six fluorescent lamps comprises two parallel circuit branches, one of which comprises a ballast capacitor and two lamps in series for a three or four lamp apparatus or three lamps in series for a five or six lamp apparatus. The other circuit branch comprises an inductor ballast and one or two lamps in series for a three or four lamp apparatus and two or three lamps in series for a five or six lamp apparatus. An additional ballast inductor connects in series with the two parallel-connected circuits and the AC power source. Starting capacitors parallel individual lamps and means are provided for preheating the lamp electrode coils upon energization of the apparatus. In operation, the lamp electrode coils are all preheated and the lamps which are ballasted by the capacitor, which constitutes the lead circuit, then sequentially start. The ballast capacitor and the additional ballast inductor constitute a circuit which is at least partially resonant at the line frequency and the resulting increased potential drop across the operating lead circuit sequentially initiates the discharge in the lamps which are in series with the first inductor, which constitutes the lag circuit. When all lamps are operating, the electrode coil heating potential is decreased to minimize power losses. For a four lamp circuit, the cost of the apparatus is considerably less than the cost of two two-lamp rapid start ballasts which are presently used for most installations, and the power losses in the present ballast are also considerably reduced.
REFERENCES:
patent: 3792310 (1974-02-01), Crawford
Elms Robert T.
Engel Joseph C.
La Roche Eugene
Palmer W. D.
Westinghouse Electric Corporation
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