嵌入式系统抗电磁干扰体系研究与实践

Study and Practice on anti-EMI Architecture of Embedded System

摘要:

针对嵌入式工业过程产品面临的复杂电磁环境,通过分析研究电磁干扰源的信号特征,探讨了抗电磁干扰的应对措施,提出了嵌入式系统产品设计时应采取的层次化的防护体系结构；在抗电磁干扰体系中,CPU及周边电路为核心,所有外部端口信号都要隔离后接入,需采取吸收、泄放、过滤等措施预先进行干扰信号衰减,防止其损坏元件,突破防护体系；结合所提出抗干扰体系结构,通过具体案例详细说明了其实现的方法；经型式试验结果和现场应用表明,所提出抗电磁干扰体系的效果良好。

Abstract:

Aimed at the complex electromagnetic environment faced by embedded industrial process product, anti-EMI measures were explored by analyzing mechanism of electromagnetic interference signal, and a hierarchical architecture for anti-EMI was proposed. In this architecture, CPU and adjacent circuits are core component, all peripheral port signals must be linked to the core by isolated components. The measures such as absorption, bypass, filtering and so on are used to reduce the interference signal strength in advance to prevent them breaking through the protective architecture by injuring components. For the proposed anti-EMI architecture, its implementation methods were illustrated by a specific case. The type test results show that the protective architecture has good anti-EMI effects.