Ignition circuit for high pressure arc discharge lamps

Details Ignition circuit for high pressure arc discharge lamps Ignition circuit for high pressure arc discharge lamps

H - Electricity

05

B

315/58

H05B 41/18 (2006.01) H05B 41/04 (2006.01)

Patent

CA 1300216

PHA 21.275 -22- 20-2-1986 ABSTRACT OF THE DISCLOSURE. Ignition circuit for high pressure arc discharge lamps. Apparatus for igniting and operating a high pressure arc discharge lamp includes a pulse generating circuit for generating high voltage pulses for starting the lamp. The pulse generating circuit is comprised of a step-up transformer, a start capacitor, a voltage sen- sitive bidirectional switch (e.g. a sidac) and an impe- dance which forms a charge circuit for the capacitor. The capacitor discharges via the switch and a part of the transformer to generate a high voltage pulse which is coupled to the lamp electrodes. An auxiliary capacitor and a serially connected inductor are coupled in parallel with the pulse generating circuit so as to clamp the open circuit voltage at a high level upon generation of the ignition pulse thereby to maintain a level of lamp current sufficient to sustain the discharge arc. This makes the lamp ignition more reliable and extends the lamp life.

514632

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