| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary voltage-switchable high-voltage transformer and a discharge lamp driving device that enable a plurality of discharge lamps to be lit stably and continuously by a single transformer, improve the reliability of the transformer, and secure the safety of the dielectric strength within a secondary winding of the transformer and other safety assurances. SOLUTION: A full bridge circuit 60 comprises a first stage switching part A, a second stage switching part B and a third stage switching part C, each having two FETs. A primary coil (a-b), for initiating lighting of the discharge lamp, is energized by switching the first stage switching part A and the third stage switching part C; while a primary coil (a-c) for normal lighting of the discharge lamp is energized, by switching the first stage switching part A and the second stage switching part B. COPYRIGHT: (C)2005,JPO&NCIPI |
