HID lighting control with transient voltage sensing and lamp...

Details HID lighting control with transient voltage sensing and lamp... HID lighting control with transient voltage sensing and lamp...

2011-07-05

2011-07-05

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

C315S307000, C315S360000, C315S362000

Reexamination Certificate

active

07973490

ABSTRACT:
A voltage control apparatus (10) for an HID lamp includes a voltage control transformer circuit (20), and is connected between supply mains (22) and a high intensity discharge (HID) lamp. The HID lamp is started at full line voltage, and after a sufficient operating interval ensuring that the lamp has achieved a sustaining temperature, the operating voltage applied to the lamp is reduced, effecting considerable savings in energy use, with little or only an acceptably small decrease in light output from the lamp. Further, the voltage control apparatus include a circuit portion responsive to voltage transients on the AC line, and which effects restarting of the HID lamp in the event a voltage transient occurs which is sufficiently long (i.e., about ½ cycle) as to extinguish the HID lamp.

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