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工业现场的恶劣电磁环境对硬件电路系统提出了越来越高的电磁兼容性要求。为了避免电磁干扰可能导致的误跳闸或误报警等事故,探讨了工业现场硬件系统的电磁兼容性设计策略。讨论了电磁环境对硬件系统的影响与抗电磁干扰设计理念,剖析了可能的电磁干扰源与抗电磁干扰机理,针对数字电路在电磁干扰下的行为,研究了电磁兼容性设计问题。实验效果验证了电路的合理布局与布线以及良好接地是必须采取的抗电磁干扰措施。工程实践表明:上述提出的电磁兼容性设计策略是行之有效的。
The harsh electromagnetic environment in the industrial field has put forward higher and higher electromagnetic compatibility requirements for the hardware circuit system. In order to avoid accidents such as false tripping or false alarm caused by electromagnetic interference, the electromagnetic compatibility design strategy of industrial hardware system is discussed. The influence of the electromagnetic environment on the hardware system and the design concept of anti-electromagnetic interference are discussed. The possible electromagnetic interference sources and the anti-electromagnetic interference mechanism are analyzed. According to the digital circuit’s behavior under electromagnetic interference, the electromagnetic compatibility design problem is studied. The experimental results verify that the reasonable layout and wiring of the circuit and the good grounding are the measures against electromagnetic interference. Engineering practice shows that the proposed EMC design strategy is effective.