Variable intensity control apparatus for operating a gas dischar

Details Variable intensity control apparatus for operating a gas dischar Variable intensity control apparatus for operating a gas dischar

1978-09-07

1980-10-28

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315283, 315287, 315290, H05B 4139

Patent

active

042309719

ABSTRACT:
A gas discharge lamp is connected in parallel with an inductor 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 bears a predetermined relationship to the rectified AC signal of said source. This results in a high frequency operation of the lamp wherein the lamp current level is controlled or modulated in accordance with the rectified AC supply voltage, providing a high power factor lamp circuit without the normal heavy lamp ballast. In addition, a circuit is disclosed which prohibits the lamp from exhibiting a high resistance when the AC voltage is at a zero crossing point, protecting the solid state switching device and stabilizing the high frequency.

REFERENCES:
patent: 3890537 (1975-06-01), Park et al.
patent: 3906302 (1975-09-01), Wisjboom
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4004187 (1977-01-01), Walker
patent: 4017785 (1977-04-01), Perper
patent: 4042856 (1977-08-01), Steigerwald

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