Starter and discharge lamp starting circuit

Details Starter and discharge lamp starting circuit Starter and discharge lamp starting circuit

H - Electricity

01

J

315/50

H01J 7/44 (2006.01) H01J 61/54 (2006.01) H05B 41/08 (2006.01)

Patent

CA 1178649

D-22,706 - 16 - STARTER AND DISCHARGE LAMP STARTING CIRCUIT ABSTRACT OF THE DISCLOSURE A glow bottle starter having three lead-in wires and containing two bimetals connected together at one end and a rigid tungsten rod. The bimetals make normally closed contact with the tungsten rod in the quiescent state of the starter, and upon electrical current flow through one or both of the bimetals to cause elevation to a predetermined temperature, the bimetals are operative to separate from the tungsten rod. In a circuit including the glow- bottle starter for starting a discharge lamp, one of the bimetals and the rigid tungsten rod are connected across the output of a ballast circuit, and the tungsten rod and other bimetal are con- nected across the lamp. Upon initial energization of the ballast, short circuit current through the bimetal connected thereto is operative to separate the bimetals from the tungsten rod to provide an open starter circuit and a switching transient across the lamp; upon starting of the lamp, the resulting current flow through both bimetals maintains the bimetals separated from the rod.

391536

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