H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/24 (2006.01) H01J 61/56 (2006.01) H01J 65/04 (2006.01) H05B 41/28 (2006.01) H05B 41/288 (2006.01) H05B 41/38 (2006.01) H05B 41/392 (2006.01)
Patent
CA 2119718
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 wall 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.
Osram Sylvania Inc.
R. William Wray & Associates
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