Common mode Choke inductor’s necessary Factors

author: MagTop
Wound inductor, power inductor
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Loss of common mode inductor = Low EMI protection performance? Such a statement is obviously rather one-sided. Admittedly, due to the national EMI relatedspecifications are not sound, some manufacturers in order to save material on the drill this hole, in the overall EMI performance are greatly save material compression cost (including the omission of common mode inductance), the direct result of this is the motherboard EMI performance is extremely low; However, for those with excellent overall design and non-shrinkage motherboard,even if there is no common mode inductor, the overall anti-EMI performance can still meet the relevant requirements, such products are still qualified.

Therefore, simply on whether there is a common mode inductance this point to judge the advantages and disadvantages of the motherboard is not appropriate.