Electromagnetic compatibility analysis
Electromagnetic compatibility refers to the ability of a device, equipment or system to operate well in the electromagnetic environment where it is located, and not to produce any unbearable electromagnetic disturbances in the environment where it is located. Electromagnetic compatibility covers electromagnetic interference and electromagnetic susceptibility. In order to realize the non-interference and compatible operation of the equipment in the system, it is necessary to control the electromagnetic emission of the harassment source and improve the immunity of the harassed object.
Analysis of electromagnetic interference
Natural factors and human factors are two ways of electromagnetic interference. According to the source, we can also divide it into internal interference and external interference. Internal interference refers to the interference between electronic devices inside electronic equipment. For example, the interference caused by leakage, the interference caused by the mutual inductance between the wires, the interference of other components caused by the heating of the component, the interference caused by the magnetic field generated by the component, etc., the external interference is mainly interference factors other than the electronic product itself. Such as external electromagnetic field interference, external electromagnetic wave interference, external high voltage interference, external humidity, temperature, pH interference, interference caused by voltage instability, etc.
Electromagnetic compatibility design
There are three major factors of electromagnetic interference, which specifically refer to the susceptor, interference source (signal generator such as electrostatic gun, surge tester and other equipment) and coupling path. When these three factors all meet the conditions, electromagnetic interference will not occur.
Based on this, electronic products need to consider two aspects when designing. One is that the electronic product itself is not interfered by internal and external factors, and the other is that the electronic product itself should not interfere with other products. Based on these two considerations, three main factors are considered in the design.
