Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1978-12-11
1981-02-24
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315105, 315276, 315307, 315335, 315DIG7, H05B 4136
Patent
active
042530466
ABSTRACT:
A gas discharge lamp is connected across a step down auto transformer and in series with a solid state switching device and a resistor, and this combination is connected across a rectified AC voltage source. This switching device is controlled by a monostable multivibrator, the input of which is connected to the output of a comparator amplifier sensing the difference between the voltage drop across the above-mentioned resistor and a voltage which may be selected to vary light intensity. A starter aid conductor is placed adjacent the lamp and connected to the grounded side of the voltage source. This results in an efficient, high frequency operation of the lamp wherein the voltage gradient inside the lamp during starting ignition of the lamp is greatly increased to facilitate ignition despite the presence of the step down auto transformer, thereby permitting a decrease in the minimum fly back voltage necessary to start the lamp. As a result, reliability is increased.
REFERENCES:
patent: 3619713 (1971-11-01), Biega
patent: 3906302 (1975-09-01), Wijsboom
patent: 4168453 (1979-09-01), Gerhard et al.
Felper Gerald A.
Gerhard Francis H.
Datapower, Inc.
LaRoche Eugene R.
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