Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1997-10-02
1999-01-12
Wong, Don
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315308, 315292, 315291, 315DIG7, G05F 100
Patent
active
058595058
ABSTRACT:
A variable duration method for controlling a high pressure gas discharge lamp to avoid arc instabilities caused, for example, by acoustic resonance. The method controls the lamp at different operating frequencies so that it stays longer at frequencies which are stable while only staying for very short times at frequencies where the arc is unstable. The method and apparatus operate the lamp at a plurality of operating frequencies and determine a stability factor for each frequency by recurrently sampling an electrical lamp parameter during operation at each frequency. The stability factor corresponds inversely to a deviation in the sensed electrical parameter, so that frequencies with little arc instability have a high stability factor and are selected more frequently for operating the lamp than are frequencies having arc instabilities, which will have low stability factors.
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Bergman Anthonie H.
Huynh Phuong T.
Philips Electronics North America Corporation
Philogene Haissa
Wieghaus Brian J.
Wong Don
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