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This article will explain in detail how to analyze the knowledge related to EMC electromagnetic compatibility technology. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Electromagnetic compatibility EMC (Electro Magnetic Compatibility) refers to the ability that the equipment or system meets the requirements in its electromagnetic environment and does not cause unbearable electromagnetic interference to any equipment in its environment.

EMC includes two aspects: on the one hand, it refers to the electromagnetic interference caused by the equipment to the environment during normal operation, which can not exceed a certain limit-- on the other hand, EMI; means that the apparatus has a certain degree of immunity to the electromagnetic interference in the environment, that is, electromagnetic sensitivity-EMS.

1. Interpretation of terms related to EMC electromagnetic compatibility:

EMC = EMI + EMS

EMC (Electro Magnetic Compatibility) electromagnetic compatibility

EMI (Electro Magnetic Interference) electromagnetic interference (external radiation)

EMS (Electro Magnetic Susceptibility) electromagnetic sensitivity (anti-interference)

II. Three elements of EMC

Interference source → coupling path → sensitive receiver

III. EMC Standards and Certification

1) the International Electrotechnical Commission (IEC) first established the International Special Committee on Radio interference (CISPR) to regulate electromagnetic radiation interference.

2) IEC/TC77, TC65 subcommittee

3) American FCC certification

4) EU EMC Directive

5) military standard, such as national military standard GJB, American standard MIL

6) International standard CISPR series, IEC61000-4 series

7) domestic standards CB/T 17626 series, GB17625, etc.

Fourth, the coupling way of the three elements of EMC.

Coupling path: that is, the channel or medium that transmits electromagnetic disturbance.

1) conduction coupling

Conduction is one of the main disturbance coupling ways between the disturbance source and the sensitive device. Conducted disturbance can be coupled through power lines, signal lines, interconnection lines, grounding conductors and so on. The solution to the conduction coupling is to remove the noise from the wire by filtering before the disturbance enters the sensitive circuit.

2) Inductive coupling

Inductive coupling is between conductors and certain components (such as transformers, relays, inductors, etc.). It can be divided into inductive coupling and magnetic induction coupling.

a. Inductive (capacitive) coupling

The voltage on the source circuit can produce a power line, which interacts with the sensitive circuit, resulting in inductive (capacitive) coupling. The induced voltage is a function of the source voltage, frequency, conductor geometry and circuit impedance.

b. Magnetic induction (inductive) coupling

When the changing current produces a magnetic flux, the source circuit is linked to another circuit (sensitive circuit), resulting in magnetic induction (inductive) coupling. The induced current is a function of the original current, frequency, conductor geometry and circuit impedance.

3) radiation coupling

The disturbance on one electric network is coupled to another through space. It belongs to the part with higher frequency (higher than 30MHz).

About how to carry on the EMC electromagnetic compatibility technology related knowledge analysis to share here, hoped that the above content can have the certain help to everybody, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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