Ignitor disabler

Details Ignitor disabler Ignitor disabler

1988-02-19

1990-10-09

Mis, David

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315DIG7, H05B 4114

Patent

active

049623362

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 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.degree. C.

REFERENCES:
patent: Re29204 (1977-05-01), Snyder
patent: 4179641 (1979-12-01), Britton
patent: 4307353 (1981-12-01), Nilssen
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4513364 (1985-04-01), Nilssen
patent: 4544863 (1985-10-01), Hashimoto
patent: 4677345 (1987-06-01), Nilssen
patent: 4763044 (1988-08-01), Nuckolls et al.
patent: 4810936 (1989-03-01), Nuckolls et al.
patent: 4896077 (1990-01-01), Dodd et al.

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