基于微机控制的LED光源控制系统设计

On the design of control system for LED light source based on microcomputer control

为了增强机器视觉中捕捉图像的清晰度以及提高图像的分辨率,获得优质稳定的图像,需要设计一款基于微机PWM信号控制的LED光源控制器.该控制器以STC12C5608AD为系统控制核心,采用单片机自身的PCA/PWM寄存器产生PWM信号控制IRFR220N场效应管的开关状态而对光源的亮暗程度进行控制.PWM调光技术属于数字化调节,不仅可以避免常规模拟调光过程中发生光线偏移现象,并且可以精确控制调光的程度,改善机器视觉过程中提取图像的质量.

In order to enhance the capacity of machine vision for acquiring more sharp higher resolution and more stable images, it is need to design a LED light controller based on the microcomputer PWM signal. The constant current source, which uses STC12C5608AD as the system control core, control the switch state of IRFR220N field-effect tube, which can adjust the bright degree of the light source, by using PCA/PWM register PWM signal. PWM dimming technology is digital regulation, can not only avoid dimming offset phenomena of the conventional analog dimming process, but also improve function of adjusting light, and improve the quality of the image.