| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-voltage discharge lamp lighting device capable of easily, inexpensively and accurately detecting and correcting a drop of a starting voltage due to extension of a wiring part 82 to a high-voltage discharge lamp 8. SOLUTION: A starting pulse generating circuit 7 includes: a transformer primary winding circuit formed of serial connection of a capacitor C1, a primary winding N1 of a transformer T1, and a switching element Q7; a transformer secondary winding circuit for boosting the voltage generated in the primary winding N1 of the transformer T1 to impress a high voltage pulse to the high voltage discharge lamp 8; and a transformer winding N3 for detecting the voltage level of the high voltage pulse generated in the transformer T1. A pulse width detection circuit 16 for detecting a pulse width correlated with the peak value of the starting pulse generated by the starting pulse generating circuit 7 is connected to the transformer winding N3, the peak value of the starting pulse voltage is indirectly detected by the pulse width detection circuit 16, and the starting pulse generating circuit 7 is controlled by use of a control circuit 9 to adjust the starting pulse voltage to a desired value. COPYRIGHT: (C)2010,JPO&INPIT |
