| 摘要 |
PURPOSE:To provide a discharge lamp lighting device wherein light can be dimmed in a wide range by transferring the discharge lamp, after it is lighted, stably to rated lighting while realizing miniaturization of the device by reducing energy of a high tension pulse for starting the discharge lamp. CONSTITUTION:Before lighting a discharge lamp 8, a transistor 27 is placed in an on-condition by an output signal from a lighting detecting circuit 29, to generated output voltage of the first DC power supply 20 in an output end of a voltage drop chopper circuit 2, and when the discharge lamp 8 is lighted, the transistor 27 is placed in an off-condition by the output signal from the lighting detecting circuit 29. Thus in the output end of the voltage drop chopper circuit 2, DC voltage almost equal to a lamp voltage value is generated. When the electric discharge lamp 8 is started thus in the above, the output voltage of the first DC power supply 20 for outputting voltage higher than the output voltage by the voltage drop chopper circuit 2 can be applied to the electric discharge lamp 8 through a bridge inverter circuit 13. |
