Ignitor turn-off switch for HID ballasts
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United States of America Patent
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-
Nov 11, 2008
Grant Date -
Feb 1, 2007
app pub date -
Jul 26, 2006
filing date -
Jul 26, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
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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