Fluorescent lamp power supply

Details Fluorescent lamp power supply Fluorescent lamp power supply

1988-04-11

1990-04-24

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315308, 315209R, 315291, 315DIG2, 315DIG7, H05B 3702

Patent

active

049203029

ABSTRACT:
A fluorescent lamp supply includes a self-resonant converter for developing high voltage AC for application to the fluorescent lamp. The on-time of the converter is controlled by a pulse width modulator circuit comprising dual comparators, with one comparator being operated as a low frequency oscillator and the other comparator being used to disable the converter by operating a gate transistor. A reference potential is applied to a potentiometer for controlling the output comparator conduction threshold and for varying the width of the pulses of the pulse width modulator. Variation of the reference potential changes the brightness of the fluorescent lamp. The pulse width modulator duty cycle is inversely proportional to changes in the DC source voltage for maintaining constant lamp brightness with changes in the DC source voltage.

REFERENCES:
patent: 4230970 (1980-10-01), Potter et al.
patent: 4326161 (1982-04-01), Kreinberg
patent: 4390812 (1983-06-01), Seidler
patent: 4499525 (1985-02-01), Mallory
patent: 4511195 (1985-04-01), Barter
patent: 4623824 (1986-11-01), Scolari et al.

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