Two-wire ballast for fluorescent tube dimming

Details Two-wire ballast for fluorescent tube dimming Two-wire ballast for fluorescent tube dimming

1978-02-06

1979-08-07

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315106, 315199, 315258, 315278, 315283, 315DIG4, H05B 4138, H05B 4120

Patent

active

041639251

ABSTRACT:
A two-wire ballast arrangement is disclosed for fluorescent tubes having first and second terminals for supplying variable power to dim the fluorescent tube, a choke coil connected between the first terminal and the fluorescent tube and a filament transformer having a primary connected between the second terminal and a tap on the choke coil, the tap being selected to supply substantially constant voltage to the primary winding, the transformer having secondary windings to supply filament voltage to the fluorescent tube.

REFERENCES:
patent: 2458277 (1949-01-01), Lark et al.
patent: 3167683 (1965-01-01), Harpley
patent: 3201645 (1965-08-01), Strecker
patent: 3222573 (1965-12-01), Lord
patent: 3249806 (1966-05-01), Genuit
patent: 3325682 (1967-06-01), Elliot, Jr.
patent: 3422309 (1969-01-01), Spira et al.

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