Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1996-03-15
1997-07-29
Pascal, Robert
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315307, 315290, 315289, 315106, 315159, G05F 100
Patent
active
056524811
ABSTRACT:
A control module and method controls the operation of a fluorescent lamp in a circuit in which the lamp is connected to a ballast and energized by alternating half-cycles of power supplied from an AC power source. The fluorescent lamp has cathodes and a medium which emits light energy when energized into a plasma. A controllable switch conducts half-cycles of AC current through the cathodes and commutates into a non-conductive condition. A sensor supplies sensing signals related to an electrical condition at the cathodes. A state transition controller controls the switch. The state transition controller establishes a power-up, warm-up, ignition and fire operational states and transitions between the states in response to the electrical condition sensed and the time duration of those conditions. The lamp lights more reliably, premature failure of the ballast and cathodes is prevented due to overheating, and the lamp is controlled effectively by input signals in the form of short power interruptions.
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Startlight TN22 Preliminary Data Sheet, SGS-Thompson Microelectronics, Nov., 1991, pp. 1/5 - 5/5.
Johnson Samuel A.
Miller Gerald G.
Rothenbuhler Dan E.
Beacon Light Products, Inc.
Ley John R.
Pascal Robert
Philogene Haissa
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