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The formation and solution of common mode interference

2013-09-22
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Common-mode interference is often the main reason for electronic and electrical products to malfunction or exceed the radiation emission test standard. It can be mainly divided into two types: one is the common-mode interference that invades the equipment, and the other is the common-mode interference radiated from the inside of the equipment. The common-mode interference that invades the equipment is mainly caused by the ground loop, so using a balanced circuit or trying to cut off the ground loop in the design can improve the anti-interference performance of the equipment. The common-mode interference in the equipment radiates outward through the connecting wire, which is equivalent to an asymmetric oscillator antenna. Common-mode filters or shielded cables can be used. But the most fundamental thing should be to work hard on the design of printed circuit boards, the arrangement of components and the arrangement of connecting wires to suppress the generation of common-mode interference sources. This article combines theory with examples to systematically introduce the causes, manifestations and suppression measures of these two common-mode interferences.

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