In order for the power supply products produced by power supply manufacturers to be sold in the market, whether at home or abroad, they need to pass various certifications. The US Federal Communications Commission in 1990 and the European Union in 1992 proposed relevant regulations for commercial digital products. These regulations Regulations require companies to ensure that their products meet strict susceptibility and emission guidelines. Products that comply with these regulations are said to have electromagnetic compatibility. The electromagnetic compatibility performance of power supplies has received more and more attention in recent years.
Radiated electromagnetic interference
The electromagnetic compatibility (EMC) of the switching power supply means that the performance indicators of the switching power supply, power adapter or power transformer will not be reduced due to electromagnetic interference under the specified electromagnetic environment level, and at the same time, the electromagnetic radiation they generate will not exceed the specified limit voltage. It is flat, does not affect the normal operation of other electronic equipment or systems, and achieves the purpose of non-interference between switching power supply and equipment, switching power supply and system, and working together reliably. The definition of electromagnetic compatibility in the national standard "Electromagnetic Compatibility Terminology" is : “The equipment or system can operate normally in its electromagnetic environment and does not cause unacceptable electromagnetic interference to anything in the environment.
The technical fields or service objects involved in electromagnetic compatibility research include almost all electrical equipment. At present, more and more countries have used electromagnetic compatibility standards as the basis for evaluating the performance of switching power adapters, chargers, power transformers or electronic products. With the high-speed and digitalization of electrical and electronic equipment, especially the European Union according to the 89/336EEC directive Since the mandatory implementation of electromagnetic compatibility standards in January 1996, there has been an upsurge in EMC research on switching power supplies, chargers, transformers and electrical and electronic products around the world.
Electromagnetic compatibility requires that switching power adapters, chargers, power transformers or electronic equipment systems should have the ability to resist certain electromagnetic interference. That is, it should not be interfered by emissions from other electronic equipment or electronic systems in the same electromagnetic environment, resulting in impermissible degradation of working performance.
