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

1985-07-29

1987-09-22

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315209CD, 315207, 315240, 315244, H05B 3700

Patent

active

046957715

ABSTRACT:
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 sensitive bidirectional switch (e.g., a sidac) and an impedance 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.

REFERENCES:
patent: 3466500 (1969-09-01), Peek
patent: 3522475 (1970-08-01), Hashimoto
patent: 3758818 (1973-09-01), Kaneda
patent: 4461982 (1984-07-01), Fahnrich
patent: 4480214 (1984-10-01), Sodini

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