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The image shown here is a simple illustration of the basic principle of operation of a common mode choke. Common mode currents i1 and i2, flowing in the same direction through each of the choke windings, creates equal and in-phase magnetic fields which add together. This results in the choke presenting a high impedance to the common mode signal, which passes through the choke heavily attenuated. The actual attenuation or common mode rejection depends on the relative magnitudes of the choke impedance.

PTM Published on: 2015-05-05