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This article introduces you how to achieve a comprehensive analysis of EMC electromagnetic compatibility, the content is very detailed, interested friends can refer to, hope to be helpful to you.

EMC (Electro MagneTIc CompaTIbility)-electromagnetic compatibility refers to the ability of electronic and electrical equipment or systems to work normally according to design requirements in the expected electromagnetic environment, and it is also an important technical performance of electronic and electrical equipment or systems. As far as the world is concerned, the problem of electromagnetic compatibility has formed a new discipline, and it is also a marginal science based on the theory of electromagnetic field, including information, electrical engineering, electronics, communications, materials, structure and so on. at the same time, it is also a practical discipline, which requires product engineers to have rich practical knowledge. The central topic of electromagnetic compatibility is to study how to control and eliminate electromagnetic interference, so that when electronic equipment or system works with other devices, it will not lead to the deterioration or degradation of the working performance of any part of the equipment or system. An ideally designed electronic device or system should not emit any unwanted energy, nor should it be affected by any unwanted energy. Of course, before the electronic equipment or system leaves the factory, the main basis to measure its EMC J performance is the FMC test results. These tests simulate some harassment and interference of the product in the actual working environment, as shown in the figure. At present, the EMC capability of a product can be measured mainly from the following two aspects.

Some harassment and interference of products in the actual working environment

(1) EMI (Electro MagneTIc Interference)-electromagnetic interference performance. That is, when the equipment or system in a certain environment is running normally, it should not produce more electromagnetic energy than is required by the corresponding standards. Such electromagnetic interference is as follows:

Electromagnetic disturbance caused by ● from the power cord

Disturbance transmitted by ● from signal line and control line

Disturbance radiated by ● from the product shell (including all cables in the product)

Harmonic current (Harmonic) of ● from the power port

Voltage fluctuation and flicker (FluctuaTIon and Flicker) generated by the ● power port.

(2) EMS (Electro MagneTIc Susceptibility)-electromagnetic disturbance rejection performance. That is, when the equipment or system is in a certain environment, it can withstand various types of electromagnetic energy interference. This kind of electromagnetic energy interference mainly includes:

● electrostatic discharge

Electrical Fast transient burst of ● Power Port

Electrical Fast transient burst Group of ● signal Line and Control Line Port

Surge and Lightning strike of ● Power Port

Surge and Lightning strike of ● signal Line and Control Line Port

Electromagnetic radiation transmitted by ● from space to product shell

Conducted interference coming from ● power port

Voltage drop and interruption of ● power port.

EMC design is in the process of product design, the use of certain design skills and additional technical means to improve the EMC performance of the product (including the anti-interference ability and anti-disturbance level of the product), and can run normally according to the design expectation of the product in a certain environment. In order to measure the EMC performance of the product before reaching the actual application environment, EMC testing is needed. Corresponding to the FMC indicators of the above products, EMC testing usually has the following two aspects.

(1) EMI electromagnetic interference test

● Power Cord conducted disturbance (CE) Test

● signal and control line conducted disturbance (CE) test

● radiation disturbance (RE) test

● harmonic current (Harmonic) test

● voltage fluctuation and flicker (Fluctuation and Flicker) test.

(2) electromagnetic immunity test of EMS

Immunity Test of ● Electrostatic discharge (ESD)

Electrical Fast transient burst (EFT/B) immunity Test of ● Power Port

Immunity Test of Electrical Fast transient burst (EFT/B) for ● signal Line and Control Line

Surge (SURGE) and Lightning Test of ● Power Port

Surge (SURGE) and Lightning Test of ● signal Line and Control Line

Radiation immunity (RS) of ● shell

Conducted immunity (CS) Test of ● Power Port

Conducted immunity (CS) Test of ● signal Line and Control Line

● power port voltage drop and interruption test (DIP).

For automobile and vehicle electronic equipment, because of its special electromagnetic environment and power supply environment, its EMC test is also relatively special, but it can also be divided into two categories: EMI test and EMS test. It highlights the importance of ISO, CISPR and SAEJ standards, and there are two specific FMC test projects.

(1) EMI test

● radiation disturbance test conforms to CISPR25 (corresponding national standard is GB18655), CISPR12 (corresponding national standard is GB14023), and SAEJ551/5 (corresponding national standard is GB18387).

● conforms to the conduction coupling / transient emission disturbance test of CISPR25 (corresponding to the national standard GB18655).

(2) EMS test

Power cord conduction coupling / transient immunity test of ● conforming to 1507637-1 stroke 2 standard

● Conductive Coupling / transient immunity Test of Sensor Cable and Control Cable in accordance with 1507637-3 Standard

Radio frequency conduction immunity test of ● conforming to 150114527 (corresponding national standard is GB17619)

● conforms to the radiation field immunity test specified in 15011452-2 (corresponding to the national standard GB17619).

Test of radiation field immunity of transverse electromagnetic wave (TEM) chamber in ● in accordance with 15011452-3 (corresponding to national standard GB17619)

● complies with the high current injection (BCI) immunity test specified in 15011452-4 (corresponding to the national standard GB17619).

● conforms to the strip line immunity test specified in 15011452-5 (corresponding to the national standard GB17619).

● conforms to the three-plate immunity test specified in 15011452-6 (corresponding fontanel marked as GB17619).

● meets the ESD immunity test of 15010605 standard.

EMC design can not exist alone like hardware circuit design, structure design, software design and other design activities, it is attached to other design activities of the product. If it is necessary to classify EMC design activities, they mainly include:

(1) EMC standard and requirement analysis of products.

(2) FMC design of the mechanical structure of the product, including the design of the cable part of the product.

(3) FMC design of circuit schematic diagram

(4) EMC design of PCB

(5) the improvement of problems in the process of EMC testing.

The comprehensive analysis of how to achieve EMC electromagnetic compatibility is shared here. I hope the above content can be of some help to you and can learn more knowledge. If you think the article is good, you can share it for more people to see.

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