| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized high-pressure discharge lamp, when it is used with 100 V, capable of securing satisfactory start behavior, maintaining the same conversion efficiency as that with 200 V, and suffering little circuit loss. SOLUTION: This device is equipped with a diode bridge 2 for rectifying alternating voltage, an active filter 3 for converting alternating voltage into direct-current voltage at a high power factor, a current limiting circuit 4 for controlling current flowing through a high-pressure discharge lamp 6, an inverter 5 for converting the direct-current voltage into low-frequency alternating voltage, a high-voltage pulse circuit 7 for generating high-voltage pulses for starting the high-pressure discharge lamp 6, and a control circuit 12 for controlling the active filter 3, the current limiting circuit 4, the inverter 5, a discharge-lamp voltage detecting circuit 11, a discharge-lamp current detecting circuit 12, and the high-voltage pulse circuit 7, respectively. |
