Fluorescent lamp brightness control

Details Fluorescent lamp brightness control Fluorescent lamp brightness control

H - Electricity

05

B

315/30

H05B 41/392 (2006.01)

Patent

CA 1291205

ABSTRACT OF THE DISCLOSURE A load side phase control circuit is used in conjunction with a conventional fluorescent light ballast (step-up autotransformer) and an isolation transformer to achieve fluorescent lamp brightness control. A resistor and capacitor connected in series shunt the phase control circuit to maintain low level illumination even when the phase control circuit is nonconducting and also provide a transient suppression when the phase control circuit switches to a conducting state. The circuit is especially suited to printed circuit board preassembly and subsequent connection to the lamp and ballast by a one step crimping operation. The resulting fluorescent lamp system - of the rapid start type - is well suited for use as a task light where the lamp is mounted relatively close to an underlying work area and receives power from a conventional outlet.

576577

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