Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1994-12-28
1996-10-29
Pascal, Robert
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315292, 315308, H05B 3702
Patent
active
055699847
ABSTRACT:
A method for detecting arc instabilities in a gas discharge lamp by evaluating the deviations of an electrical parameter of the lamp. A method suitable for detecting frequencies at which acoustic resonance induced instabilities occur evaluates the deviations measured over a range of frequencies. Selection of an operating frequency to avoid acoustic resonance is based on an evaluation of the deviations, such as the frequency at which the lowest standard deviation occurs for the electrical parameter measured. Favorably, the electrical parameter used is the conductivity, which provides high insensitivity to noise, is independent of ballast topology, and enables detection of acoustic resonance at levels not visible to the human eye. A control scheme tracks acoustic resonance during run-up of the lamp and quickly selects a favorable operating frequency after the lamp reaches steady-state. Resonance detection is achieved both during run-up and the steady state substantially without inducing visible flicker. The method and ballast employ universal techniques suitable for operating HID lamps of different types, wattages and manufacturers despite the occurrence of acoustic resonance/arc instabilities among these lamps over a fairly broad frequency range.
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Pascal Robert
Philips Electronics North America Corporation
Shingleton Michael
Wieghaus Brian J.
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