| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-wire DC power distribution system that supplies power-supply power to electric appliances by a DC current while using two-wire wiring, which allows a reduction in laying costs, so as to control operation of the electric appliance such as dimming of LED lighting, and a two-wire dimmer. <P>SOLUTION: A DC power distribution system 10 is configured such that two-wire wiring is connected with a DC power distribution board 12, an LED lighting fixture 14, and a control device 16 (a dimmer) of the LED lighting fixture 14. When a MOSFET Q1 is in an off-state, a current flowing in a power generator 20 is smoothed by an integrating circuit of the power generator 20 and supplied to a PWM oscillation part 22 so as to be an operation power-supply of a dimming control circuit. The dimming control circuit is provided in the PWM oscillation part 22 in order to control illuminance of the LED lighting fixture 14. By this, only two wires are wired to the dimmer in the DC power distribution system 10, thereby reducing the laying costs and providing an efficient wiring system. <P>COPYRIGHT: (C)2011,JPO&INPIT |
