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About EMI Filter
Feb 19, 2019

Electromagnetic interference (EMI) is broadly defined as the electrical or magnetic interference that degrades or damages the integrity of a signal or the components and functionality of electronic equipment. Electromagnetic interference, which encompasses radio frequency interference, is normally broken into two broad areas. 

An EMI filter for a power supply normally consists of passive components, including capacitors and inductors, connected together to form LC circuits. The inductor(s) allow DC or low frequency currents to pass through, while blocking the harmful unwanted high frequency currents.  The capacitors provide a low impedance path to divert the high frequency noise away from the input of the filter, either back into the power supply, or into the ground connection.