| 摘要 |
PROBLEM TO BE SOLVED: To reduce interference of radio noises with other electronic equipment or the like in an illumination control system in which a plurality of power supply circuits for controlling an alternate current power supply in a rectangular wave for lighting a plurality of light sources are installed. SOLUTION: The illumination control system is equipped with a plurality of the light sources 10, a plurality of power supply circuits 20 to supply lighting electric power against these respective light sources 10, and a system control part 30 for dimming and controlling the plurality of power supply circuits 20 via a communication passage 40. A superimposed output voltage V3 comprised by superimposing a sine wave operating voltage V1 and a rectangular wave control voltage V2 is made the lighting electric power, and a frequency of the control voltage V2 of the respective power supply circuits 20 are made mutually different between at least neighboring light sources 10. By this, there is no concentration of the radio noises in a specific frequency region in the neighboring power supply circuits, and interference of the radio noises with the other electronic equipment or the like can be reduced. COPYRIGHT: (C)2009,JPO&INPIT |
