Method and apparatus for starting high intensity discharge...

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

H - Electricity

05

B

315/63

H05B 41/30 (2006.01) H01J 61/54 (2006.01)

Patent

CA 1162594

METHOD AND APPARATUS FOR STARTING HIGH INTENSITY DISCHARGE LAMPS Abstract of the Disclosure A high pressure sodium lamp, which includes a dis- charge 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 micro- second. 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 conven- tional lamp ballast provides ac power during starting and normal operation. 22,473

374784

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