| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorescent lamp lighting device not to be liable to burden a chopper circuit and an inverter circuit with a load. SOLUTION: The fluorescent lamp lighting device comprises a chopper circuit 4, an inverter circuit 6, fluorescent lamps 9, 10 to which the high frequency output of the inverter circuit 6 is supplied through respective resonance circuits 7, 8 composed of LC serial circuit, lamp power detecting circuits 11, 12 detecting the power of respective fluorescent lamps 9, 10, a total power detecting circuit 13 detecting total lamp power of the plurality of fluorescent lamps, and a frequency setting circuit 14 having a function of reducing the power value of the fluorescent lamps 9, 10 by making the oscillation frequency of the inverter circuit 6 change through the oscillation circuit 5 when respective detected power values of the lamp power detecting circuits 11, 12 and the total power detecting circuit 13 get to a prescribed value. The prescribed value of the total power detecting circuit 13 is set lower than the total power value obtained by summing up the prescribed value of respective lamp power detecting circuits 11, 12. COPYRIGHT: (C)2004,JPO |
