System and method including self oscillating feedback for...

Details System and method including self oscillating feedback for... System and method including self oscillating feedback for...

H - Electricity

05

B

H05B 41/36 (2006.01) H01J 61/38 (2006.01)

Patent

CA 2720902

A system and method including self oscillating feedback for acoustic operation of a discharge lamp. The system includes a ballast configured to receive a modulation input and modulate a lamp power signal in accordance with the modulation input. A photodetector senses the optical output of the lamp to provide an electrical feedback to a feedback circuit. The feedback circuit filters the feedback to couple a portion thereof corresponding to a selected acoustic resonance mode of the lamp to the ballast as the modulation input thereby causing self--oscillation at the selected acoustic resonance mode.

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