Media Inductors in EMC - Part 3: Common-mode noise filtering
 
 

Inductors in EMC - Part 3: Common-mode noise filtering

2024-11-14 02:45:04| Spiritual Career Counseling

This article introduces magnetic components for common-mode noise filtering:Clamp ferrites (cable ferrites)Common-mode chokesBoth are widely used in the field of electromagnetic compatibility (EMC) to filter common-mode noise. This article presents common-mode noise filtering fundamentals, characteristics and some real applications.What is common-mode noise?Common-mode noise is one of the most common sources for radiated emission. The characteristics of common-mode noise can be seen in the picture below: a common-mode noise current flows through the signal forward AND through the return signal path in the SAME direction. There are different sources of common-mode noise, such as capacitive coupling (simultaneously to the forward and return current signal path) or a noisy reference point. There are two effects that might occur when common-mode noise is present:Radiated emissions caused by unintended antennas (e.g. long cables).Differential-mode noise caused by unbalanced lines (common-mo...


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