Abstract A fluorescent lamp lighting device comprises a d.c. power source, a transistor, a transformer and a fluorescent lamp. The d.c. power source is connected in series with the primary winding of the transformer between a first electrode and a second electrode of the transistor. The fluorescent lamp has one filament connected to one end of a first secondary winding of the transformer. A second secondary winding of the transformer is connected between the other end of the first secondary winding of the transformer and the junction of the d.c. power source and the primary winding of the transformer. The fluorescent lamp has the other filament connected between the junction of the first secondary winding of the transformer and the second secondary winding and a third electrode of the transistor.
Apparatus for energizing a fluorescent lamp having a pair of filaments, each having first and second ends, from a d.c. power source comprising a transistor having first, second and third electrodes, a transformer including a primary winding having one end connected to the first electrode of said transistor and the other coupled through said d.c. power source to the second electrode of said transistor, a first secondary winding having one end connected to the first and second ends of one of the filaments of said fluorescent lamp and the other end connected directly to the first end of the other filament of said fluorescent lamp, and a second secondary winding connected between the other ends of said primary and first secondary windings, and means coupling the second end of the other filament of said fluorescent lamp to the third electrode of said transistor.
Claim 2
Dependent Claim
143 words
Apparatus for energizing a fluorescent lamp having a pair of filaments, each having first and second ends, from a d.c. power source comprising a transistor having first, second and third electrodes, a transformer including a primary winding having one end connected to the first electrode of said transistor and the other coupled through said d.c. power source to the second electrode of said transistor, a first secondary winding having one end connected to the first and second ends of one of the filaments of said fluorescent lamp and the other end connected directly to the first end of the other filament of said fluorescent lamp, and a second secondary winding connected between the other ends of said primary and first secondary windings, and means coupling the second end of the other filament of said fluorescent lamp to the third electrode of said transistor.
Claim 3
Dependent Claim
37 words
A fluorescent lamp lighting device as set forth in claim 1 wherein the first electrode of said transistor is a collector electrode, the second electrode is an emitter electrode and the third electrode is a base electrode.