DISCHARGE LAMP LIGHTING DEVICE AND LIGHT FIXTURE

摘要

In a discharge lamp lighting device that, at a time of starting a discharge lamp La, alternately repeats periods HF1 and HF2 while high frequency voltages are being outputted, in which a resonant circuit performs resonant operations, and periods FB1 and FB2 while square wave voltages are being outputted, and at a time of lighting the discharge lamp La, applies a low-frequency square wave voltage to the discharge lamp La through a starting circuit 4, there are provided: a starting detection circuit 5 that detects the starting of the discharge lamp La during the periods FB1 and FB2 while the square wave voltages are being outputted; and a control circuit 3C that stops the high frequency voltage or lowers a frequency of the high frequency voltage in the case where the starting of the discharge lamp La is detected. In the case where the starting of the discharge lamp La has been detected at least once, the control circuit 3C increases the number of repetitions of a period while the high frequency voltage and the square wave voltage are being outputted alternately. In such a way, in the discharge lamp lighting device that alternately generates the high frequency voltage and the square wave voltage at the time of the starting, sure startability is ensured. 32