A power filter is a filtering circuit composed of capacitors, inductors, and resistors, also known as a "power EMI filter" or "EMI power filter". It is a passive bidirectional network with one end being the power supply and the other end being the load. A power filter is an electrical device that effectively filters out frequencies at or outside a specific frequency point in a power line. The function of a power filter is to obtain a specific frequency power signal or eliminate a specific frequency power signal by connecting a power filter to the power line. By utilizing this characteristic of the power filter, a square wave group or composite noise that passes through the power filter can be transformed into a specific frequency sine wave. Filters for high-power power sources such as Satons, UBS, frequency converters, etc. will generate a large amount of harmonic currents, and such filters require the use of active power filters (APFs). APF can filter out 2-50 harmonic currents. Manufacturers of this type of filter include Inex Electric, ABB, Siemens, and other manufacturers
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