What is the EMC of the power adapter?

In order to enter the market and sell the power products produced by power supply manufacturers, it is necessary to pass various certifications at home and abroad. In 1990, the Federal Communications Commission of the United States and in 1992, the European Union The rules and regulations for commercial digital products are put forward, which require companies to ensure that their products meet strict magnetization coefficient and emission criteria. Products complying with these Regulations are referred to as having electromagnetic compatibility. In recent years, more and more attention has been paid to the EMC performance of power supply. Today, Shenzhen power supply manufacturer will take you to understand what EMC is.

The electromagnetic compatibility (EMC) of switching power supply refers to that under the specified electromagnetic environment level, the switching power supply, power adapter or power transformer will not reduce its performance index due to electromagnetic interference, and the electromagnetic radiation generated by them will not be greater than the specified limit level, will not affect the normal operation of other electronic equipment or systems, and achieve the switching power supply and equipment, switching power supply and system For the purpose of mutual non-interference and reliable operation, the definition of electromagnetic compatibility in the national standard "electromagnetic compatibility terms" is: "equipment or system can work normally in its electromagnetic environment and does not constitute unbearable electromagnetic interference capability for anything in the environment.

The technical field or service object of EMC research includes almost all electrical equipment. At present, more and more countries have taken the EMC standard as the evaluation basis for the performance of switching power adapter, charger, power transformer or electronic products. With the high-speed and digitalization of electrical and electronic equipment, especially since the European Union began to enforce the EMC standard in January 1996 according to 89 / 336eec directive, it has set off a worldwide trend for switching power supply and charging The upsurge of EMC Research on electrical appliances, transformers and electrical electronic products.

EMC requires that the system of switching power adapter, charger, power transformer or electronic equipment shall be able to resist certain electromagnetic interference. That is to say, it shall not be interfered by other electronic equipment or electronic system in the same electromagnetic environment, resulting in the disallowed performance degradation.