Common mode interference
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Common mode interference
Common mode interference refers to the same amplitude of interference voltage on the signal line and its return line (generally referred to as the signal ground wire). The voltage here takes any nearby object (earth, metal case, reference ground wire board, etc.) as the reference potential, and the interference current circuit flows in the circuit composed of the wire and the reference object.
Summary
The definition of "common mode" interference in the practical manual of electromagnetic compatibility edited by Chen Weihua refers to the potential difference between the power line and the earth, or between the center line and the earth. For three-phase circuits, common mode interference exists between any phase and the earth. Common mode interference is sometimes called longitudinal mode interference, asymmetric interference or ground interference, which is the potential difference between the current carrying conductor and the earth. The difference between it and differential mode is that the differential mode interference exists between the phase line and the neutral line of the power supply.
Common mode interference usually refers to the common signal interference which is loaded on each input signal interface segment at the same time. Common mode interference is transmitted between signal line and ground, which belongs to asymmetric interference.
Common mode interference is like two people pushing you forward or backward at the same time. The opposite difference mode interference is pulling you one before and one after.