| 摘要 |
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 means 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 may operate down to minus 40 DEG C.
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