| 摘要 |
A switching circuit includes a plurality of transistors connected to a primary winding of the transformer and alternately applies an input voltage and a ground voltage to the primary winding according to turning-on and turning-off of each of the transistors. A plurality of capacitors are provided to the respective fluorescent lamps. One ends of the capacitors are commonly connected to a secondary winding of the transformer, and the other ends thereof are connected to the respective fluorescent lamps. A control circuit monitors a current flowing through a predetermined current path among current paths of the entire circuits including an inverter and the fluorescent lamps and performs feedback control of the turning-on and turning-off states of a plurality of the transistors of the switching circuit to adjust supply of switching power to the primary winding of the transformer so that the monitored current can be maintained in a predetermined condition.
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