Fluorescent lamp brightness control

Details Fluorescent lamp brightness control Fluorescent lamp brightness control

1986-07-31

1988-12-20

Moore, David K.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315209M, 315244, 315DIG4, 315308, 315219, 315194, H05B 41392

Patent

active

047927291

ABSTRACT:
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.

REFERENCES:
patent: 4352045 (1982-09-01), Widmayer
patent: 4371812 (1983-02-01), Widmayer
patent: 4388567 (1983-06-01), Yamazaki et al.
patent: 4447764 (1984-05-01), Kornrumpf et al.
patent: 4459515 (1984-07-01), Smith
patent: 4463286 (1984-07-01), Justice
patent: 4464610 (1984-08-01), Pitel
patent: 4568857 (1986-02-01), Head
patent: 4633141 (1986-12-01), Weber

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