End-of-life lamp starter disabling circuit

Details End-of-life lamp starter disabling circuit End-of-life lamp starter disabling circuit

1989-09-15

1991-05-28

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315119, 315225, 315DIG7, H05B 4114

Patent

active

050197517

ABSTRACT:
A disabling circuit for deactivating a high pressure sodium lamp starting and operating circuit when the lamp exhibits end-of-life cycling includes a normally closed thermal switch connected to the starting and operating circuit is inoperative, the switch having contacts which open in response to an elevated temperature. A heating element is connected in parallel with the lamp so that the voltage across the lamp is applied to the heating element. The heating element is supported in a selected heat conducting relationship with the thermal switch so that a predetermined elevated temperature is reached and the contacts are opened only after the dissipation of an amount of energy resulting from repeatedly high lamp open-circuit voltage accompanying end-of-life cycling.

REFERENCES:
patent: 3699385 (1972-10-01), Paget
patent: 4179641 (1979-12-01), Britton
patent: 4207500 (1980-06-01), Duve et al.
patent: 4433272 (1984-02-01), Ogawa
patent: 4461980 (1984-07-01), Nilssen
patent: 4763044 (1988-08-01), Nuckolls et al.

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