Common mode choke cores
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Common-mode inductor is also called common-mode choke coil, is essentially a two-way filter: on one hand, to filter electromagnetic interference in signal lines; on the other hand, to restrain itself from sending out electromagnetic interference and to avoid affecting the normal work of the other electronic equipment under the same electromagnetic environment. Common-mode inductor also plays a role as EMI filter to suppress electromagnetic waves outward radiation which produced by high speed signal lines.