| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device which provides both reduction in size of a circuit board and high output, a straight tube type LED lamp, and a lighting fixture.SOLUTION: A lighting device 100 includes a rectification circuit 3 which converts a commercial AC power source 1 to DC, a converter circuit which includes a first transformer 5 and a second transformer 6 which supply electric power to a semiconductor light emitting element (LED) connected to an output, and a control circuit 11 which controls a switching element 7 of the converter circuit. The converter circuit is a so-called flyback converter, and is provided on a printed board 20 and connected to the rectification circuit 3. The first transformer 5 and the second transformer 6 have cores forming magnetic paths respectively, and are arranged at positions adjacent to each other on the printed board 20, in which the directions of magnetic fluxes generated inside the cores facing the adjacent positions are same. |
