Circuit for starting and ballasting arc discharge lamps

Details Circuit for starting and ballasting arc discharge lamps Circuit for starting and ballasting arc discharge lamps

H - Electricity

05

B

355/47, 315/59

H05B 31/30 (2006.01)

Patent

CA 1147476

LD-7927 CIRCUIT FOR STARTING AND BALLASTING ARC DISCHARGE LAMPS ABSTRACT OF THE DISCLOSURE A circuit for starting and ballasting a compact high-intensity arc discharge lamp. A filament connected in series with the arc lamp provides illumination during arc start-up and functions as a ballast during normal arc operation. An oscillatory starting circuit includes a transformer and a frequency-controlling ringing circuit, and applies starting voltage to the arc lamp until an operating arc is established. The circuit includes capacitor means for isolating the starting transformer from the operating path of the arc lamp, and further includes a voltage-doubling starting circuit and also a "keep-alive" feature which prevents the arc from extinguishing during power fluctuations.

353452

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