Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1990-11-19
1991-11-26
Mis, David
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315171, 315175, 315315, 315316, H05B 4136, H05B 4144
Patent
active
050685775
ABSTRACT:
Novel systems, circuits, and methods for initiating ionization, maintaining constant illumination current, and extinguishing illumination in a gas discharge tube and in gas discharge tube arrays. Input controls for current regulating circuits for gas discharge tubes comprise directly connected semiconductor logic circuits. In the currently preferred embodiment, each gas discharge tube is maintained in consistently bright illumination by a constant current or extinguished by inhibition of the constant current, as controlled by a surprisingly simple circuit comprising a single PNP transistor and three resistors. A parallel coupled input which provides an impedance connection for a gas discharge tube ionizing high voltage pulse comprises a single resistor and a serially interposed isolating diode which protects the transistor from the high voltage ionizing pulse and imposes the ionizing pulse primarily upon the gas discharge tube. The constant illumination maintaining current provides a controlled illumination brilliance from each emitting gas discharge tube which is particularly useful in large display arrays such as programmable signs, scoreboards and the like.
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Foster Lynn G.
Integrated Systems Engineering Inc.
Mis David
LandOfFree
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