Excitation supply for gas discharge tubes

H - Electricity – 05 – B

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H05B 41/36 (2006.01) H05B 41/285 (2006.01)

Patent

CA 1316210

EXCITATION SUPPLY FOR GAS DISCHARGE TUBES Abstract of the Disclosure The present invention uses a variable fre- quency oscillator to drive a primary resonant converter output transformer circuit for exciting gas discharge tubes. The combination of the impedance of the reso- nant 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 fre- quency of the oscillator, the optimal ouput 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 unde- sirable 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.

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