Ignitor disabler

Details Ignitor disabler Ignitor disabler

H - Electricity

05

B

315/59

H05B 41/14 (2006.01) H05B 37/03 (2006.01) H05B 41/04 (2006.01) H05B 41/18 (2006.01)

Patent

CA 1286353

ABSTRACT An ignitor disabler for the starter circuit of a High Intensity Discharge (HID) lamp includes means for disabling the ignitor, and means for triggering the disabling mens of the ignitor after passage of a predetermined amount of time. The triggering means has a timing component that begins time measuring operation only under certain, predetermined conditions. The disabler includes means for resetting the timing component of the triggering means upon lamp ignition. In its preferred embodiment, the starter circuit specifically includes AC threshold voltage establishing means and a field effect transistor for ensuring that a timing capacitor in the disabler triggering circuit is effectively discharged to zero volts. The disabler trigger circuit is enabled to operate at least down to minus 40°c and below with a characteristic move closely matched to lamp requirements at such low temperatures.

557223

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