| 摘要 |
PURPOSE:To make the feeding voltage to individual power source devices in a low voltage and to reduce the scope of receiving the influence of a trouble and the like by providing individual power source devices dispersed to each group made by grouping one or plural lamps, and connecting the individual power source devices in parallel to a central power source. CONSTITUTION:Individual power source devices 2 are provided responding to lamps 1 at the ratio 1:1. Each power source device 2 is formed by including a current control circuit 3, a voltage/current detector 4 to detect the lamp current, and a lamp monitor control circuit 5. In this case, the lamp monitor control circuit 5 is preferably composed by using a microcomputer. The individual power source devices 2 are connected in parallel to the central power source 6 respectively through a wiring 7. By composing in such a way, the scope to receive the influence of a trouble and the like is remarkably reduced, and at the same time, the voltage of the lighting circuits can be made in a low voltage. |
