Ignition circuit for gas discharge lamp

Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...

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315241R, 315245, 315DIG5, H05B 3700

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active

051592444

ABSTRACT:
A starter circuit is supplied with 120 volt 60 Hz power, and is coupled to a gas discharge lamp having in an interior thereof a gas and two spaced electrodes. When the starter circuit applies to the electrodes a voltage in excess of a threshold voltage, the lamp transitions from a non-conductive state in which no visible light is emitted to a conductive state in which visible light is emitted. The starter circuit includes several voltage doubler circuits coupled in series with each other between the electrodes of the lamp to form a voltage multiplier circuit. When the lamp is in its non-conductive state, the voltage doubler circuits each output a substantially DC voltage which is twice the maximum potential of the 120 volt input signal so that the voltage multiplier as a whole applies to the electrodes a significant DC voltage in excess of the threshold voltage so that the lamp transitions from its non-conductive state to its conductive state. In response to the transition of the lamp to its conductive state, the starter circuit applies to the lamp an AC voltage substantially less than the threshold voltage.

REFERENCES:
patent: 4394603 (1983-07-01), Widmayer
patent: 4463285 (1984-07-01), Nilssen
Donald G. Fink, Standard Handbook for Electrical Engineers, McGraw-Hill Book Company, Tenth Edition, Title Page and pp. 19-22 and 19-23.
E. Molloy, The Electrical Engineer's Reference Book, George Newnes Limited, Eighth Edition, Title Page and pp. v, 12-10 to 12-20.
E. Norman Lurch, Fundamentals of Electronics, John Wiley & Sons, Inc., Second Edition, Title Page and pp. 174 to 179.

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