Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1993-03-24
1994-12-13
Nelli, Raymond A.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315291, H05B 4116, G05F 100
Patent
active
053732170
ABSTRACT:
A method and circuit for providing stability during dimming of an electrodeless high intensity metal halide discharge lamp driven by a microwave source. Light from the lamp is rapidly dimmed to a low level in a stable manner while preventing the possibility of lamp extinction. Remote optical sensing of lamp light output is coupled with power control circuitry which modifies power delivered to the lamp based on the light response to well defined pulses of power in the output of the microwave source. Power delivered to the lamp is increased when the rate of light drop exceeds a predetermined rate and also, is controlled based on the overall light emission intensity. As a result, stable dimming is achieved regardless of the initial conditions of the discharge. The dimming method disclosed is more forgiving of light-source-system manufacturing tolerances than is presently available using absolute light intensity control alone when source output power is limited.
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Bessone Carlo S.
Nelli Raymond A.
Osram Sylvania Inc.
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