Method and apparatus for starting high intensity discharge lamps

Details Method and apparatus for starting high intensity discharge lamps Method and apparatus for starting high intensity discharge lamps

1980-04-11

1982-05-04

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Filament, electric heater, or resistance in shunt with the...

315 60, 315 72, 315 73, 315DIG7, 315 74, 315106, 315125, H01J 744, H01J 1734, H01J 1978, H01J 2996

Patent

active

043284469

ABSTRACT:
A high pressure sodium lamp, which includes a discharge tube enclosing xenon at pressures in excess of 300 torr, is reliably started by the combination of an igniter, a conductor wrapped around the discharge tube, and a switching circuit. The igniter provides periodic pulses of 2500 to 4000 volts with a duration of at least one microsecond. The switching circuit provides a high voltage pulse having an amplitude about equal to the amplitude of the periodic pulses and a duration much greater than the duration of the periodic pulses. The conductor intensifies the electric field within the discharge tube. A conventional lamp ballast provides ac power during starting and normal operation.

REFERENCES:
patent: 4001634 (1977-01-01), Corbley et al.
patent: 4064416 (1977-12-01), Krense et al.
patent: 4135114 (1979-01-01), Narikiyo
patent: 4137483 (1979-01-01), Ochi et al.
patent: 4179640 (1979-12-01), Larson et al.
patent: 4258288 (1981-03-01), Michael et al.
patent: 4277725 (1981-07-01), Sneijers

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