AC Line Filter

AC Line Filters, also known as coils or chokes, suppress electromagnetic interference (EMI) noise. ... These coils are available in a variety of form factors and heights, including split and non-split bobbin designs in common mode, as well as differential / normal mode, dual mode, and earth inductors. A line filter is the kind of electronic filter that is placed between electronic equipment and a line external to it, to attenuate conducted radio frequencies -- RFI, also known as electromagnetic interference (EMI) -- between the line and the equipment. The two primary functions of the power line filter are: Preventing high frequency signals generated within the device from reaching the input power line. Preventing high frequency signals on AC power distribution system (disturbance) from entering into equipment.