Anti-cycling device for high pressure sodium lamps

Details Anti-cycling device for high pressure sodium lamps Anti-cycling device for high pressure sodium lamps

1990-04-02

1992-04-07

Laroche, Eugene R.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315290, H05B 3700

Patent

active

051031370

ABSTRACT:
The invention disclosed here is an anti-cycling device for high-pressure sodium lamps. A current sensor continually monitors lamp current and outputs a low voltage signal to an amplifier. When lamp current increases, indicating a starting or recycling condition, the sensor's voltage output correspondingly increases, and the amplifier responds by amplifying such output and transmitting it to a second amplifier. The latter acts as a voltage comparator and compares the first amplifier's output with a threshold level. Each time the first amplifier's output exceeds the threshold, the second amplifier outputs a trigger signal. Such signal is counted over time, and if the number of counts reaches a certain number, the counter outputs a malfunction signal to a relay that cuts off power to the lamp. An easy-to-see LED simultaneously illuminates to indicate the cycling condition and the need for lamp maintenance.

REFERENCES:
patent: 3631441 (1971-12-01), Murphy
patent: 3995262 (1976-11-01), France
patent: 4207500 (1980-06-01), Duve et al.
patent: 4473779 (1984-09-01), Lindner et al.
patent: 4745339 (1988-05-01), Izawa
patent: 4810936 (1989-03-01), Nuckolls et al.
patent: 4853599 (1989-08-01), Singarayer
patent: 4949018 (1990-08-01), Siglock

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