Fluorescent lamp dimming circuit employing an improved...

Details Fluorescent lamp dimming circuit employing an improved... Fluorescent lamp dimming circuit employing an improved...

H - Electricity

05

B

315/44

H05B 41/38 (2006.01)

Patent

CA 1052440

ABSTRACT OF THE DISCLOSURE An adjustable dimming circuit is provided to control light output levels of a fluorescent lamp. The dimming circuit comprises an intensity selector circuit controlling an auxiliary circuit, and a ballast circuit which is con- trolled by the auxiliary circuit. The intensity selector circuit comprises a control switch and a power switch. The control switch is gated on by the intensity selector circuit and controls the operation of the power switch by providing gate current for the power switch after the control switch comes on until zero crossover current in the control switch. The ballast circuit is used to limit current to the fluor- escent lamp and to provide starting pulses for the lamp. The power switch in the auxiliary circuit controls the timing of the application of the starting pulses applied to the lamp, and also provides a current path during the operation of the lamp.

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