Circuit and method for improved dimming of gas discharge lamps

Details Circuit and method for improved dimming of gas discharge lamps Circuit and method for improved dimming of gas discharge lamps

1990-07-13

1991-08-20

Mis, David

Electric lamp and discharge devices: systems

Plural power supplies

Diverse-type current supplies

315307, 315DIG4, H05B 4138

Patent

active

050417630

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 and a current feedback control system. The circuit is essentially an ac current source of unusually high impedance and provides substantially symmetrical high-frequency current to the lamp. This allows flicker-free dimming of compact fluorescent lamps over a wide range with good light output stability. A small amount of dc or low-frequency ac current may be simultaneously provided to the lamp. The resulting composite current waveform flowing through the lamp substantially eliminates visible striations over a dimming range from about 100% to 1% of full light output.

REFERENCES:
patent: 4562382 (1985-12-01), Elliot
patent: 4633161 (1986-12-01), Callahan et al.

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