Do you know how to design electromagnetic compatibility?

Last Update Time: 2019-08-23 15:57:39

For the R&D design process of a new project, the EMC design needs to run through the whole process. In the design, considering the design of electromagnetic compatibility, it will not be reworked, avoiding repeated research and development, which can shorten the time-to-market of the whole product and improve the efficiency of the enterprise.


From the research and development to the market, a project needs to undergo several stages such as demand analysis, project establishment, project summary design, project detailed design, sample trial production, functional testing, electromagnetic compatibility testing, project commissioning, and investment in the market.


In the demand analysis stage, product market analysis, on-site investigation, mining of useful information for the project, integration of project development prospects, detailed work environment of the project product, site inspection of installation location, whether there is limited space for installation, and whether the working environment is special, Is there corrosion, humidity, high temperature, etc., the working condition of the surrounding equipment, whether there is a bad electromagnetic environment, whether it is limited with other equipment, whether the successful development of the product can greatly improve the production efficiency, or whether it can give people a living or working environment. It brings great convenience, and the operation and use method can be easily accepted by people. This requires the project product to meet the needs of the field function, easy to operate, etc. Finally, the detailed demand analysis report should be compiled for the needs review.


After reviewing the relevant internal responsible persons, the requirements analysis report is completed, and then the project is established. The project project needs to set up a project team, and arrange software, hardware, structure, test and other personnel into the project team to assign their respective responsibilities. The next stage of project development is the project outline design, which breaks down the project into multiple functional modules, uses the WBS decomposition structure to decompose the project, and arranges the time according to the workload to arrange specific personnel. Organize the project summary design report, evaluate the project as a whole, determine the power type, power distribution, power isolation filter, system grounding, product shielding, product structure using shield design, shielded chassis, analysis signal type, Thunder, static electricity, group pulse and other interferences take protective measures.


After the product summary design report comes out, it must be reviewed by relevant personnel, whether the implementation method is reasonable, and whether the implementation plan is feasible. The review report is given by the reviewer. The project team and the review report modify the summary design and enter the detailed design stage of the product. The content of the stage includes schematic design, PCB design, PCB procurement and soldering, software writing, function debugging and other processes. The schematic design should take into account the influence of electromagnetic compatibility, increase the filter capacitance to the board-level power supply, and increase the interface part of the signal. The filter circuit selects a suitable filter circuit according to the signal type. If the signal is a low frequency model, the low pass filter circuit should be selected to calculate the appropriate cutoff frequency and select the corresponding resistor and capacitor. In addition, a large current bleeder circuit is designed for the interface part, and a lightning protection device is provided to achieve the third level of lightning protection.


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