基于CPLD的线阵CCD动态驱动电路设计与应用

Design and Application of a CCD Dynamic Driving Circuit Based on CPLD

提出了一种基于CPLD的新型线阵CCD动态驱动电路的设计方法,系统微处理器根据光强变化,调节输出的空驱动数目,从而动态控制光积分时间。采用该驱动电路,系统可在高速工作主频下,获得较高的系统采样精度,并且解决了CCD输出信号受环境影响而产生的饱和失真和背景与物体无法分开的问题。目前,此驱动电路已应用于钢厂带钢纵切机组自动对中系统中,效果良好。

A new way of dynamic linear array CCD driving circuit design based on CPLD was presented. In the design, system microprocessor can adjust the number of empty driving pulses according to the intensity of surrounding lamp-house so as to control CCD optical-integral-time. With this driving circuit, system can work on high frequency with high system sample accuracy. Moreover, the problem of saturation distortion and the difficulty of separating object from background are resolved. A dynamic CCD driving system based on CPLD has been applied in an automatic centering system to cut strap shaped steels vertically and been proved to be highly effective.