Swept frequency switching excitation supply for gas discharge tu

Details Swept frequency switching excitation supply for gas discharge tu Swept frequency switching excitation supply for gas discharge tu

1992-01-24

1995-01-31

Mis, David

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Periodic-type current and/or voltage regulator in the supply...

315219, 315223, 315226, 315291, 315220, 315225, H05B 4129, H05B 4136, H05B 4144

Patent

active

053861817

ABSTRACT:
The present invention describes a method and apparatus for a swept frequency switching gas discharge tube supply which produces a "crawling effect" in gas discharge tubes containing neon, argon or mercury gases or other gases and which has a means for eliminating the "bubble effect". To produce the "crawling effect", the driving frequency of the switching supply is swept from a higher frequency to a lower frequency thereby causing the excitation point to move from the electrodes on both ends of the dual electrode gas discharge tube to the center of the gas discharge tube. By varying the base switching frequency of the supply, the bubble effect which plagues some displays can be eliminated.

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