摘要
为提高交通灯控制系统的可靠性,设计出"总线模式"的控制系统,实现了对多个信号灯组和计数器的显示控制。利用电力线载波芯片LM1893实现主控制器通过电源线与各路口控制器通信、移位寄存器74HC595实现计数器显示信息的串行传送,最大限度减少连线。并设计了具有自动调光功能的开关电源驱动器,可延长LED使用寿命。实验结果表明,系统运行稳定,具有可靠性高、体积小、配置灵活的特点。
To improve the stability of traffic light control system, the paper designed a ＂bus model＂ control system, which can control a number of lights and counter display lights. Using power line carrier chip LM1893 to achieve communications between the main controller and the intersection controllers. Shift register 74HC595 counter showed the realization of the serial transmission of information to minimize the connection. We also designed switching power supply driver with automatic dimming functions to extend the service life of LED. The results show that the system was stable, high reliability, small size and flexible with configuration.
关键词
交通灯控制
总线模式
自动调光
可靠性高
traffic light control
bus model
automatic dimming
high reliability
