Excitation supply for gas discharge tubes

Details Excitation supply for gas discharge tubes Excitation supply for gas discharge tubes

1988-04-05

1990-04-10

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315223, 315225, 315226, 315291, H05B 4136

Patent

active

049163620

ABSTRACT:
The present invention uses a variable frequency oscillator to drive a primary resonant converter output transformer circuit for exciting gas discharge tubes. The combination of the impedance of the resonant conversion circuit along with the impedance of the driven gas discharge tube taken in combination with the frequency of the variable oscillator will determine the output voltage of the circuit. By varying the frequency of the oscillator, the optimal output voltage and hence the optimal brightness of the gas discharge tube may be selected. At the optimal output voltage, the frequency of the switching supply may create an undesirable or desirable "bubble effect" in the gas discharge tube. An optional secondary frequency may be combined with the frequency of the variable frequency oscillator to create or eliminate the bubble effect according to the esthetic desires of the user.

REFERENCES:
patent: 2355477 (1944-08-01), Stahl
patent: 3703677 (1972-11-01), Farrow
patent: 4187450 (1980-02-01), Chen
patent: 4274136 (1981-06-01), Onodera et al.
patent: 4373146 (1983-02-01), Bonazoli et al.
patent: 4414491 (1983-11-01), Elliott
patent: 4523131 (1985-06-01), Zansky
patent: 4547705 (1985-10-01), Hirayama et al.
patent: 4667132 (1987-05-01), Leale
patent: 4719390 (1988-01-01), Sairanen
patent: 4754199 (1988-06-01), Parker
Letter from Advanced Neon Systems, (undated); "JB Transformer Instructions".
Data Sheet from National Semiconductor describing LM556 Dual Timer Circuit.

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