According to the characteristics of the interference source, frequency range, voltage and impedance parameters, as well as the requirements of the load characteristics, filters should be selected appropriately, generally considering:

With the rapid development of modern science and technology, the application of electronics, power electronics, and electrical equipment is becoming increasingly widespread. They generate high-density, wideband electromagnetic signals during operation Number fills the entire space, creating a complex electromagnetic environment. The complex electromagnetic environment requires electronic devices and power supplies to have higher electromagnetic compatibility. So the technology of suppressing electromagnetic interference is also receiving increasing attention. Grounding, shielding, and filtering are the three major measures to suppress electromagnetic interference. The following mainly introduces the EMI filters used in power supplies, their basic principles, and correct application methods.

The latest analysis report from Frost&Sullivan shows that the global HarmonicFilter market had a revenue of $416.7 million in 2005, and it is estimated that the market size will reach $889.1 million by 2012.

With the growth of the PC and wireless communication industries, the performance of chip size filters that can reduce electromagnetic interference (EMI) and radio frequency interference (RFI) is constantly improving and becoming increasingly popular.

Introduction to Basic Knowledge of Power Filter