HIGH VOLTAGE DISCHARGE LAMP LIGHTING APPARATUS AND ILLUMINATING EQUIPMENT

摘要

A high-pressure discharge lamp lighting device includes: a power converter circuit 3 which includes a plurality of switching elements Q2 to Q6 and an inductance element L2, converts an input from a DC power supply 2, and supplies a rectangular wave AC output to a high-pressure discharge lamp DL; and a control circuit 9 which controls the switching elements Q2 to Q6 of the power converter circuit 3. The control circuit 9 performs first lighting control in which the switching elements Q2 to Q6 of the power converter circuit 3 are controlled in order to supply a current to a peak value for each switching cycle, and performs second lighting control in which desired power is supplied during steadily lighting state of the high-pressure discharge lamp DL; and the first lighting control and the second lighting control are switched over in response to a lighting state of the high-pressure discharge lamp DL.