DISCHARGE LAMP LIGHTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide good circuit efficiency and a wide dimming range in a dimming discharge lamp-lighting apparatus. SOLUTION: This lighting apparatus is a current feedback discharge lamp- lighting apparatus composed of a chopper circuit 2 and a discharge lamp-lighting circuit 3 containing a DC/AC converter part. Lighting is dimmed by a dimming system to control a lamp current from 40% to 100% by a dimming signal switching apparatus 11 and lighting is dimmed by repeating lighting and extinguishing operations of a discharge lamp 5 by a chopping dimming signals from 5% to 40%. Consequently, without lowering the circuit efficiency so much, the dimming can be carried out to 5%.