基于TMS320F2812控制器的自动调光系统设计

为满足面阵CCD航空相机获得清晰图像的需要，设计一种以数字处理芯片TMS320F2812为核心调光控制器，结合可编程逻辑器件EPM7128完成逻辑运算与电平转换，集成光敏二极管芯片OPT301M为检光元件，模数转换器AD7865将模拟量转换为数字量，直流电机控制单帘幕快门帘缝速度，光电编码器反馈速度信号，程序代码实现调光算法与控制的自动调光控制系统。实验表明，在180r/min的阶跃输入信号下，得到调节时间为0.095s， 最大超调量为7.2%，速度误差为1.08r/min，其特性参数满足性能指标的要求。

Design of automatic light-adjusting system based on TMS320F2812 controller

In order to satisfy the need of acquiring clear image in area CCD aerial camera, an automatic light adjustment control system based on digital signal processer TMS320F2812 as the core light adjustment controller was designed. The control system consisted of programmable logic device EPM7128 worked as logic operation and electric level conversion, integrated photodiode and amplifier OPT301M worked as detective light device, A/D converter AD7865 which converted analog signal to digital signal, direct circuit motor which controlled curtain type shutter speed, photoelectric encode which fed back speed signal, program code which realized automatic light adjustment arithmetic and control. The experiment results show：with the input step signal of 180r/min, the adjustable time is 0.095s, speed error 1.08r/min, which meets the need of system.