Magnetic-electronic dual-frequency ballast

Details Magnetic-electronic dual-frequency ballast Magnetic-electronic dual-frequency ballast

1990-05-18

1993-12-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural power supplies

Diverse-type current supplies

315200R, H05B 3700

Patent

active

052706184

ABSTRACT:
A magnetic-electronic fluorescent lamp ballast is so arranged that the fluorescent lamp is powered simultaneously by two different currents; which two currents are supplied to the lamp by two separate parallel-connected current sources. One current is of 60 Hz frequency and is supplied directly from an ordinary 120 Volt/60 Hz power line by way of an ordinary magnetic reactor. The other current is of 30 kHz frequency and is derived from the power line by way of a frequency converter and is then supplied to the fluorescent lamp by way of a 30 kHz resonant circuit and a high-pass filter. The frequency converter is powered from the power line by way of a capacitive reactor, with the net result being that the power factor of the total power drawn from the power line is very high. The overall ballast is simple and provides for a relatively high efficacy.

REFERENCES:
patent: 4187448 (1980-02-01), Kuroi et al.
patent: 4362971 (1982-12-01), Sloan, Jr.
patent: 4388561 (1983-06-01), Koshimura et al.
patent: 4392086 (1983-07-01), Ide et al.
patent: 4484107 (1984-11-01), Kaneda
patent: 4604552 (1986-08-01), Alley et al.
patent: 4612478 (1986-09-01), Payne

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