MULTI-OUTPUT HIGH-FREQUENCY STEP-UP TRANSFORMER FOR FLUORESCENT TUBE

摘要

PROBLEM TO BE SOLVED: To provide a multi-output high-frequency step-up transformer for fluorescent tube for turning on a plurality of parallel-arranged fluorescent tubes used as a back light of a liquid crystal display panel with high current precision.;SOLUTION: The multi-output high-frequency step-up transformer for fluorescent tube which has a plurality of secondary coils 22 wound into a main magnetic circuit loop and shunting magnetic bodies 26, 27 and 28 fitted to the respective secondary coils 22 is characterized in that a second primary coil 21b is wound around a magnetic body at an opposite side of the first primary coil 21a so as to suppress reduction of flux linkage with the distance between the primary coil 21 and the secondary coil 22. The second primary coil 21 is thus arranged and then even if magnetic flux leaks from the main magnetic circuit loop to the air to reflow, respective secondary coils 22 becomes equal in flux linkage, thereby greatly reducing variation in voltage among respective outputs with the simple constitution.;COPYRIGHT: (C)2009,JPO&INPIT