| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-emitting element lighting device which allows for stabilized lighting control without turning a triac off unexpectedly, even if noise overlaps on the power supply line of an AC power supply near the zero-cross of power supply voltage, and to provide a lighting fixture and an illumination system.SOLUTION: A light-emitting element lighting device includes an illumination load 11 having a light source 1g consisting of a light-emitting element, and a power conversion circuit 1c for supplying the lighting power to the light source 1g by using the power from a commercial power supply 10, a triac Q11 connected in series with a series circuit of the power conversion circuit 1c and the commercial power supply 10, and a lighting control section 3 performing phase control for making the conduction angle of AC voltage of the commercial power supply 10 variable, by controlling a bidirectional switching element Q11. The lighting control section 3 supplies a trigger signal for turning the triac on continuously, for a predetermined period of the period for conducting the triac Q11, and the power conversion circuit 1c has a power factor improvement function of the commercial power supply 10. |
