单片机系统抗干扰常用方法

中文字数: 5299,中文页数: 8  英文字数:  4107,字符数:21274,页数:12

 单片机系统抗干扰常用方法
影响单片机系统可靠安全运行的主要因素主要来自系统内部和外部的各种电气干扰，并受系统结构设计、元器件选择、安装、制造工艺影响。这些都构成单片机系统的干扰因素，常会导致单片机系统运行失常，轻则影响产品质量和产量，重则会导致事故，造成重大经济损失。    形成干扰的基本要素有三个：     1）干扰源。指产生干扰的元件、设备或信号， 用数学语言描述如下：du/dt， di/dt大的地方就是干扰源。如：雷电、继电器、可控硅、电机、高频时钟等都可能成为干扰源。    2）传播路径。指干扰从干扰源传播到敏感器件的通路或媒介。典型的干扰传播路径是通过导线的传导和空间的辐射。     3）敏感器件。指容易被干扰的对象。如：A/D、 D/A变换器，单片机，数字IC，弱信号放大器等。 1 干扰的分类 1.1 干扰的分类

 Single in common use method in interference in anti- in system in a machine
 The main factor that single a machine system in influence dependable safety circulate comes from the system inner part primarily with exterior and every kind of electricity interference, and suffer the system construction the design, a machine piece choice, install, manufacturing craft influence.These constitute the interference factor of the single a machine system, will often cause single a machine system circulated to disorder, light an influence product quantity with yield, the heavy will cause trouble, result in the important economy loss.
An essential element that become the interference has three:
   1) interference source.Point a piece, equipments or signals that produce the interference, describe with the mathematics language as follows:Du/ dt, the big place in di/ dt is an interference source.Such as:Thunder and lightning, after the electric appliances, can control  , electrical engineering, high  clock etc. may become the interference source.
   2) spread path.Point the interference to spreads from the interference source thoroughfare or mediums of the sensitive machine piece.The typical interference spreads the path is to passes to lead the linear conduction with the spatial radiation.
 3) sensitive machine piece.Point easy drive the object of the interference.Such as:A/ D, D/ A transformation machine, single a machine, arithmetic figure IC, weak signal enlarger etc..
1 The classification of the interference
1.1 The classification of the interference
The classification of the interference contain

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