DISCHARGE LAMP LIGHTING DEVICE AND PROJECTOR

摘要

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device and a projector capable of restraining flicker by reducing fluctuation of discharge lamp current due to voltage fluctuation of a power source, in the case of one having a power source part rectifying and smoothing a commercial power source for use as a lamp lighting power source. SOLUTION: The discharge lamp lighting device using the power source part rectifying and smoothing the commercial power source as a lamp lighting power source detects voltage fluctuation of a power source supplied from the power source part, superposes the detected voltage on a detected voltage of a discharge lamp current detecting circuit or a reference voltage, and controls the discharge current constant. It may control so as to switch a superposing ratio of the detected voltage of the power source in accordance with a discharge lamp voltage or a discharge lamp power output. COPYRIGHT: (C)2006,JPO&NCIPI