Ignitor turn-off switch for HID ballasts

Details Ignitor turn-off switch for HID ballasts Ignitor turn-off switch for HID ballasts

2006-07-26

2008-11-11

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S307000, C315S360000

Reexamination Certificate

active

07449840

ABSTRACT:
The instant invention relates to an ignitor turn-off switch for ballasts for high intensity discharge (HID) lamps to prevent damage to ballasts by disconnecting the ignitor if a lamp has failed or is missing. The ignitor turn-off switch circuit comprises an AC power source, a full-wave bridge rectifier circuit, a voltage regulator circuit, a first solid state integrated circuit as a timer circuit, and a second solid state integrated circuit as a switch circuit. The second solid state integrated circuit comprises an optically-coupled triac and light emitting diode wherein the optically-coupled triac is driven by a beam generated by the light emitting diode.

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