Dimming circuit for a fluorescent lamp

Details Dimming circuit for a fluorescent lamp Dimming circuit for a fluorescent lamp

1992-04-23

1993-08-17

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315DIG4, 315307, 315224, H05B 4129

Patent

active

052372430

ABSTRACT:
A dimming circuit having a magnetic forced oscillating means incorporating a transformer having three windings, the second winding being connected across a DC power supply and the third winding being coupled to a fluorescent lamp. The second winding is also coupled to an oscillator circuit incorporating a first resistor, a transistor and the first winding. The circuit also includes a variable resistor serially connected to the first resistor, the variable resistor including a movable arm coupled to the first winding for controlling the frequency of operation and thus the brightness of the lamp.

REFERENCES:
patent: 4172981 (1979-10-01), Smith
patent: 4572990 (1986-02-01), Leale et al.
patent: 5049788 (1991-09-01), Lee
patent: 5051661 (1991-09-01), Lee

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