Low frequency square wave electronic ballast for gas discharge

Details Low frequency square wave electronic ballast for gas discharge Low frequency square wave electronic ballast for gas discharge

1993-07-12

1995-06-27

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315307, 315324, H05B 4116

Patent

active

054282683

ABSTRACT:
A low frequency square wave electronic ballast used for a gas discharge device includes a high power factor pre-regulator connected to a sinusoidal AC power supply and a power controlled DC current source connected to the pre-regulator. A low frequency square wave DC-to-AC inverter is connected to the DC current source and an ignitor circuit is connected to the inverter. A monitor circuit as well as a low power stabilized logic supply voltage source are also employed. The entire circuit is connected to a gas discharge device such that the instantaneous power of this device is constant and controlled providing an acoustic resonance free operation and an ideal ballast curve.

REFERENCES:
patent: 4396872 (1983-08-01), Nutter
patent: 4475065 (1984-10-01), Bhalla et al.
patent: 4999547 (1991-03-01), Ottenstein
patent: 5099176 (1992-03-01), Fellows et al.
patent: 5235255 (1993-08-01), Blom
"A New Electronic Ballast for HID Lamps"; H. Nishimura et al; Journal of the Illuminating Engineering Society; Summer 1988; pp. 70-76.
"Electronic Ballasts for Metal Halide Lamps"; Faehnrich et al; Journal of the Illuminating Engineering Society; Summer 1988; pp. 131-140.

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