Electromagnetic Compatibility

Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate compliantly in its electromagnetic environment without causing intolerable electromagnetic interference to any equipment in its environment. Therefore, EMC includes two requirements: on the one hand, it means that the electromagnetic interference generated by the equipment to the environment in the normal operation process cannot exceed a certain limit; degree of immunity, ie electromagnetic susceptibility.

In the International Electrotechnical Commission standard IEC, the definition of electromagnetic compatibility is: the system or equipment can work normally in the electromagnetic environment where it is located, and it will not cause interference to other systems and equipment.

EMC includes two parts: EMI (electromagnetic interference) and EMS (electromagnetic tolerance). The so-called EMI electromagnetic interference is the electromagnetic noise generated by the machine itself in the process of performing its due functions that is not conducive to other systems; and EMS refers to the machine. The ability to perform its intended function independently of the surrounding electromagnetic environment.

Electromagnetic compatibility (Electro Magnetic Compatibility) refers to the normal working ability of various electrical or electronic equipment to meet the design requirements with a specified safety factor in a common space with complex electromagnetic environment. Also called electromagnetic compatibility. Its meaning includes:

①The mutual consideration between electronic systems or equipment in the electromagnetic environment;

②The electronic system or equipment can work normally according to the design requirements in the natural electromagnetic environment. If it is extended to the impact of electromagnetic fields on the ecological environment, the subject content of electromagnetic compatibility can be called environmental electromagnetics.

The research of electromagnetic compatibility is with the gradual development of high frequency, high speed, high precision, high reliability, high sensitivity, high density (miniaturization, large-scale integration), high power, small signal application, and complexity with electronic technology. need to develop gradually. Especially after a large number of modern electronic technologies are used in artificial earth satellites, missiles, computers, communication equipment and submarines, the electromagnetic compatibility problem is more prominent.