| 摘要 |
PROBLEM TO BE SOLVED: To take circuit protecting measures by reducing the maximum allowance of applied electric power value over the course of time so that excessive transient electric power application is not performed continuously in the occurrence of load abnormality or the like, in a device for lamp lighting discharge. SOLUTION: In the discharge lamp lighting device, in a transient period, since lighting of the discharge lamp is started from a cold state until it reaches a steady lighting state, the maximum initial power exceeding rated power is applied, and then the applied electric power to the discharge lamp is reduced over the course of time. A maximum power regulating circuit is disposed to regulate applied electric power in the transient period so that it does not exceed the upper limit power line M1 or M2 reduced over the course of time, after the application of the maximum initial power. This prevents the excessive transient electric power application from continuing for a period longer than necessary at the load abnormal times, suppresses the calorific value, and prevents the thermal destruction or the like. COPYRIGHT: (C)2006,JPO&NCIPI |
