ELECTRIC DISCHARGE LAMP OPERATING DEVICE, LIGHTING EQUIPMENT AND LIGHTING SYSTEM

摘要

A discharge lamp lighting device includes: a direct current power supply circuit 1 that outputs direct current power; an inverter circuit 2 that converts the direct current power, which is outputted by the direct current power supply circuit 1, into alternating current power, and supplies the alternating current power to a discharge lamp DL; a control circuit 3 that controls a frequency of an output of the inverter circuit 2 (operation frequency); and a starting detection circuit 4 that detects beginning (starting) of a discharge in the discharge lamp DL. The control circuit 3 operates in a starting improvement mode, in which the operation frequency is lowered than an operation frequency in a lighting mode, during a predetermined time from when the starting of the discharge lamp DL is detected by the starting detection circuit 4 during a no-load mode. Thereafter, the control circuit 3 shifts to the lighting mode in which lighting of the discharge lamp DL is maintained. In such a way, the discharge lamp DL can be smoothly shifted to stable lighting.