Circuit for dimming compact fluorescent lamps

Details Circuit for dimming compact fluorescent lamps Circuit for dimming compact fluorescent lamps

1996-06-27

1998-11-24

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315291, 315224, 315278, 315244, 315DIG4, G05F 100

Patent

active

058412395

ABSTRACT:
A dimming control circuit provides power from an ac source to a compact fluorescent lamp. The circuit generally includes a resonant half-bridge inverter driven by a pulse-duration-modulated voltage, for providing a high-frequency ac voltage between the lamp electrodes. A combination inductive and capacitive snubber circuit reduces switching losses in the inverter and increases the efficiency of the dimming circuit. A low-voltage transformer connected across the resonant portion of the inverter provides voltage to heat the lamp filaments. The filament voltage is substantially constant over a range of pulse-durations providing a dimming range from about 100% to 1% of full light output. A power supply circuit having a power factor of about 0.95 provides both high-voltage and low-voltage dc power to the dimming circuit with minimal losses. A shutdown circuit is provided to shut off power to the lamp if the dimming circuit is miswired or a ground fault occurs.

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May & Christe GmbH Transformatorenwerke brochure.
Lutron Electronics Co., Inc. Hi-Lume.RTM. Fluorescent Dimming Control brochure.
Luciano Di Fraia, "A method to achieve continuous dimming of low pressure sodium and other gas discharge lamps," Journal of IES, Jul. 1981, pp. 245-252.
Welding Power Handbook by Union Carbide.
Cherry/Gas Plasma Displays brochure.

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