微机控制系统的抗干扰技术研究
2015-08-14袁战军王瑾李小斌
袁战军+王瑾+李小斌


摘 要: 为了提高微机系统的测控精度及稳定性,提出微机控制系统的抗干扰设计方法。详细介绍了微机控制系统的软、硬件抗干扰设计措施,硬件抗干扰措施主要包括电源系统抗干扰、I/O接口抗干扰等几部分,软件抗干扰措施包括指令冗余、软件陷阱和软件滤波等。同时,将一些抗干扰措施应用于卷烟机烟支重量控制系统中,实验结果表明,这些措施是有效的,能够较好地消除和抑制进入烟支重量控制系统的干扰信号。
关键词: 微机控制系统; 抗干扰技术; 烟支重量控制; 测控精度
中图分类号: TN973.3?34; TP368 文献标识码: A 文章编号: 1004?373X(2015)15?0142?03
Research on anti?interference technology for microcomputer control system
YUAN Zhanjun1, WANG Jin2, LI Xiaobin3
(1. Department of Electronics, Shaanxi Institute of International Trade & Commerce, Xianyang 712046, China;
2. College of Information Engineering, Shaanxi Polytechnic Institute, Xianyang 712000, China;
3. Department of Electronics and Electrical Engineering, Baoji University of Arts and Sciences, Baoji 721016, China)
Abstract: To improve the precision and stability of measurement and control in microcomputer system, the anti?interfe?rence design method of microcomputer control system is presented. Software and hardware anti?interference measures of microcomputer system are introduced in detail. Hardware anti?interference measures include power system anti?interference, I/O interface anti?interference and other circuits. Software anti?interference measures include instruction redundancy, software trap and software filtering. Some anti?interference measures are applied in cigarette weight control system of cigarette making machine. The experimental results show that these measures are effective, and can eliminate and restrain interference signals entered into cigarette weight control system effectively.
Keywords: microcomputer control system; anti?interference technology; cigarette weight control; measurement and control precision
微机控制系统经常工作在环境恶劣的生产现场,会遭受各种干扰的影响。例如:卷烟机烟支重量控制系统周围存在着众多执行机构和控制设备,它们的启停和运行都会产生较大的电磁干扰;又如视频监控所用云台控制系统,也会受到电源波动、雷电放电等干扰的影响。由于干扰的存在,会影响被测信号的精度和程序的正常运行,严重时还会导致系统无法工作[1]。因此,在微机控制系统设计时,必须采取有效的抗干扰措施才能保证系统的可靠运行。
1 抗干扰原则
为保证微机控制系统的测控精度,必须把进入系统的干扰信号抑制到一定强度范围内,常用的抗干扰原则如下:
(1) 消除干扰源,有些干扰可通过采取一定措施予以消除,例如通过合理布线、改进焊接工艺可消除由线间感应、多点接地造成的电位差;……
