Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1998-03-30
1999-08-31
Philogene, Haissa
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315291, 315224, 315127, 315DIG5, 315DIG7, G05F 100
Patent
active
059457880
ABSTRACT:
An electronic ballast (300) for powering at least one gas discharge lamp (10) includes an inverter (400), an output circuit (700), a lamp fault detection circuit (800), and an inverter control circuit (500). Ballast (300) operates according to an inverter control method (100) that includes repeating a filament preheating step and a frequency shifting step up to a predetermined number of times in order to facilitate lamp ignition under low-temperature conditions and to verify the legitimacy of a lamp fault. Inverter control circuit (500) is well-suited for implementation as a custom integrated circuit. Ballast (300) optionally includes an overcurrent detection circuit (820') with an adjustable lamp fault detection threshold that provides decreased sensitivity during lamp starting and enhanced protection after lamp ignition.
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Li Edward
Liu Guang
Stephens Dennis L.
Upadhyay Anand K.
Labudda Kenneth D.
Motorola Inc.
Philogene Haissa
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