1. Electromagnetic Compatibility

Electromagnetic Compatibility (EMC) refers to the ability of a device or system to operate in its electromagnetic environment without causing unacceptable electromagnetic interference to any device in its environment. Therefore, EMC includes two aspects: on the one hand, it means that the electromagnetic interference generated by the equipment in the normal operation of the equipment cannot exceed a certain limit; on the other hand, it means that the equipment has certain electromagnetic interference in the environment. Degree of immunity, ie, electromagnetic susceptibility.

The definition of electromagnetic compatibility in the International Electrotechnical Commission standard IEC is that the system or equipment can work normally in the electromagnetic environment in which it is located, and it will not cause interference to other systems and equipment. EMC includes EMI (Electromagnetic Interference) and EMS (Electromagnetic Tolerance). The so-called EMI electromagnetic interference is the electromagnetic noise generated by the machine itself in the course of performing its due function, and the EMS is the machine. The ability to perform functions that are not affected by the surrounding electromagnetic environment.

2. Electromagnetic Compatibility Test Standard

GB 4343.1/EN55014/CISPR 14-1 Electromagnetic compatibility requirements for household appliances, power tools and similar devices

GB 9254/EN 55022/CISPR 22 Radio disturbance limits and measurement methods for information technology equipment

GB 4824/EN 55011/CISPR 11 Electromagnetic disturbance characteristics of industrial, scientific and medical radio-frequency equipment Limits and methods of measurement

GB/T 17626.2/EN61000-4-2 ESD (Electrostatic discharge)/ESD test

GB/T 17626.3/EN61000-4-3 RS (Radiated Susceptibility)/radio frequency electromagnetic field immunity test

GB/T 17626.4/EN61000-4-4 EFT/Burst (Electrical fast transient)/Electrical Fast Transient Burst Immunity Test

GB/T 17626.5/EN61000-4-5 Surge/(Shock) Surge immunity test

GB/T 17626.6/EN61000-4-6 CS (Conducted Susceptibility) / Conducted disturbance susceptibility test induced by radio frequency field

GB/T 17626.8/EN61000-4-8 PFMF (Powerfrequency magneticfield)/power frequency magnetic field immunity test

GB/T 17626.11/EN61000-4-11 PQF (Voltagedips, interruption and variation)/voltage transient immunity test

GBT 18029.21-2012 Wheelchairs - Part 21: Electromagnetic compatibility requirements and test methods for electric wheelchairs, electric scooter and battery chargers

GBT 24338.5-2009 Rail traffic Electromagnetic compatibility Part 4: Emission and immunity of signal and communication equipment

YY 0505-2012 Medical Electrical Equipment Part 1-2 General Requirements for Safety and Collateral Standard Electromagnetic Compatibility Requirements and Tests

FCC PART 15/FCC PART 18 US Radio EMC Test Requirements

3. EMC terminology

(1) Equipment (equipment) Any electrical, electronic, or electromechanical device that operates as a single unit and performs a single function.

(2) "System" means "a number of equipment, sub-systems, full-time personnel, and technology combinations that can perform or guarantee work tasks."

(3) Electromagnetic environment The sum of all electromagnetic phenomena present in a given location.

"Given place" means "space" and "all electromagnetic phenomena" includes all "time" and all "spectrum."

EMC: (Electromagnetic compatibility) Electromagnetic Compatibility

EMI: (Electromagnetic interference) Electromagnetic Interference

EMS: (Electromagnetic Susceptibility) Electromagnetic sensitivity

RE: (Radiated emission) Radiation disturbance (commonly known as: electromagnetic radiation, radiation emission)

CE: (Conducted emission) conducted harassment (commonly known as: conducted emission)

CS: (Conducted Susceptibility) Conducted Harassment Immunity

RS: Radiated Susceptibility RF radiated immunity

ESD: (Electrostatic discharge) Electrostatic discharge

EFT/Burst: (Electrical fast transient burst) Electrical fast transient burst

RFI: (Radio Frequency Interfernce) Radio Frequency Interference

ISM: (Industrial Scientific Medical) RF Equipment for Industrial, Scientific, and Medical Applications

4. Electromagnetic Compatibility Applications

1) IT information technology field;

2) modern medical devices, medical devices related to the field of electrical and electronic;

3) The application of automotive electronics and automotive electronics technology is related to the automotive electromagnetic environment, which is mainly caused by the electromagnetic environment in which the vehicle is located. At the same time, the ability of the vehicle to resist electromagnetic harassment is also crucial.

4) Safety requirements related to electromagnetic EMC of mechanical equipment and electrical equipment systems;

5) Due to the development of technologies such as electronics, electrical, wireless communications, and radar detection, and their increasing application in the aerospace industry, issues related to electromagnetic compatibility (EMC) and electromagnetic interference (EMI) are also receiving increasing attention. Compatible disciplines have thus developed.

6) The lighting equipment products electromagnetic compatibility EMI specific safety requirements;

7) Due to the continuous deterioration of the electromagnetic environment, home appliance products have attracted more and more attention due to the electromagnetic compatibility issues. The electromagnetic compatibility standards for home appliances have also been continuously updated with actual needs. European Standard EN 55014-1:2006/+A1:2009.