Circuit for dimming gas discharge lamps without introducing stri

Details Circuit for dimming gas discharge lamps without introducing stri Circuit for dimming gas discharge lamps without introducing stri

1989-12-22

1991-03-19

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315166, 315171, 315307, 315DIG4, H05B 4129, H05B 41392

Patent

active

050013866

ABSTRACT:
A dimming circuit provides power from an ac source to a compact fluorescent lamp. The circuit generally includes a resonant circuit driven by a high-frequency switching inverter. The resonant circuit is essentially an ac current source and provides sinusoidal current to the lamp, which loads the resonant circuit in parallel. A small amount of dc current is simutaneously provided to the lamp. The resultant asymmetric current waveform flowing through the lamp substantially eliminates striation over a dimming range from about 100% to 1% of full light output.

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May & Chrsite GMBH Transformaternwerke brochure.
Welding Power handbook, Union Carbide, Manz, A.F., pp. 100-109, 9-1981.
Cherry/Gas Plasma Displays brochure, No. CE-023.
Luciano DiFraia, "A Method to Achieve Continuous Dimming of Low Pressure Sodium and Other Gas Discharge Lamps", Journal of IES (Jul. 1981), pp. 245-252.

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