Usually composed of inductive components, capacitive components and radio frequency absorption components. The inductive element filters out the high-frequency interference current from the power line, the capacitive element filters out the low-frequency industrial current from the power line, and the RF absorbing element is used to absorb electromagnetic waves.
This makes the interference current in the power line lower, which improves the quality of the power supply and protects sensitive electronic equipment from interference.
High-frequency interference currents mainly come from electromagnetic radiation, such as radio interference, electromagnetic interference and so on. These interference currents will have an impact on sensitive electronic equipment, making the work of the equipment unstable or even failure. The low-frequency industrial frequency current, on the other hand, mainly comes from industrial frequency voltage fluctuations and sub-wave interference in the power supply network.
The filter protects sensitive electronic equipment by filtering out high-frequency interference currents and low-frequency industrial currents. This makes the working environment of electronic equipment cleaner and improves the reliability and lifetime of electronic equipment.
In addition, filters can be used to reduce electromagnetic radiation and prevent interference with the surrounding environment. Therefore, power filters have a wide range of applications in electronic equipment, communication equipment, power equipment and other fields.
There are also many types of filters and applications
High-pass filter: It filters out low-frequency signals from the output through high-pass filter components (mainly inductors). Commonly used in communications, audio, broadcasting and other fields.
Low-pass filter: It filters out high-frequency signals from the output through low-pass filter components (mainly capacitors). Commonly used in industrial control, medical, test instruments and other fields.
Band Stop Filter: It filters out specific frequency band signals from the output through band stop filter components, commonly used in image processing, audio and video codecs, industrial control and other fields.
Synthesized filter: It is a filter composed of multiple filter elements combined according to the demand, commonly used in special applications
Filter design also needs to consider the input and output impedance matching, the specific filtering effect and so on. Different types of filter components and combinations of different applications to solve the problem of electromagnetic interference.