Starting and operating apparatus for high-pressure sodium lamps

Details Starting and operating apparatus for high-pressure sodium lamps Starting and operating apparatus for high-pressure sodium lamps

1980-08-14

1982-06-29

Dixon, Harold A.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315DIG7, 315209SC, H05B 3700

Patent

active

043374174

ABSTRACT:
A lighting apparatus which provides for high-voltage pulses for starting a high-pressure sodium discharge lamp and thereafter provides operating ballasting. The apparatus uses two capacitors and associated blocking diodes and a charging resistor. One of the capacitors charges toward the peak of the line voltage in the negative half cycle, and thereafter, when the line voltage goes positive, the voltage on the one capacitor is added to the line voltage for charging the other capacitor. When the voltage on the other capacitor reaches a predetermined voltage exceeding the Zener voltage of a paralleling Zener diode which Zener voltage may be about twice the peak voltage of the line, the other capacitor discharges through a ballast inductor which is connected in autotransformer relationship therewith to provide a high voltage pulse of sufficient magnitude to start the lamp.

REFERENCES:
patent: 3917976 (1975-11-01), Nucholls
patent: 3963958 (1976-06-01), Nucholls
patent: 4072878 (1978-02-01), Engel et al.
patent: 4143304 (1979-03-01), Hitchcock
patent: 4210850 (1980-07-01), Britton

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