Apparatus for operating a discharge lamp.

摘要

driven from the d.c. power source so as to be oscillated at a predetermined frequency or a duty ratio, a discharge lamp (5) connected to the inverter (2), a lamp voltage detecting means (6) for detecting a voltage applied to the discharge lamp, a lamp start control means (8) for regulating the inverter during a period of time from the initiation of discharge up to the stable lighting by changing the oscillating frequency or the duty ratio, thereby allowing a large current to flow through the discharge lamp when a voltage applied to the discharge lamp is low, and allowing a small current to flow therethrough when the lamp voltage is high.