一种自适应交通流量LED路灯的设计

A Design of LED Streetlight Adaptive to Traffic Flow

文章提出一种通过交通流量控制LED路灯输出功率的思路和实现方法。系统利用摄像的方法检测交通流量的大小,通过已有的单灯控制Zigbee网络向单片机STC89C51传递信号,由单片机控制输入到LED驱动控制芯片XLT604的PWM信号,通过改变PWM信号的占空比来控制LED路灯的输出功率,进而改变道路的照度水平。从而在保持LED驱动电源恒流输出的前提下实现了交通流量实时控制道路照度水平的设计,既节能又保证照明质量。

This paper proposes the idea and method that by detecting traffic flow to control the LED streetlight output power. The system uses the method of camera shooting to detect traffic flow, passing signals to STC89C51 MCU by zigbee network of single lamp control. The PWM signal that is inputted to the LED driver control chip XLT604 is controlled by the microcomputer. The system controls the output power of LED streetlight by changing duty cycle of the PWM signal, thereby changes illumination level of road. Under the premise of maintaining LED driver power supply constant current output, this paper realizes the design of the real-time traffic flow controlling illumination level of road, thus achieving the effects that saving energy as well as gurantee the quality of lighting.