The working principle of common mode inductors

The working principle of common mode inductors   Working Principle： 1. When common-mode current flows through, the magnetic flux in the magnetic ring is superimposed on each other, so that it has a considerable inductance, which suppresses the common-mode current. When the differential-mode current flows through the two coils, the magnetic flux in the magnetic ring cancels each other, and there is almost no inductance, so the differential-mode current can pass without attenuation. Therefore, the common-mode inductor can effectively suppress the common-mode interference signal in the balanced line, and has no effect on the differential-mode signal transmitted normally by the line. 2. The chip on the PC board is both an electromagnetic interference object and an electromagnetic interference source during operation. In general, we can divide these electromagnetic interferences into two categories: series-mode interference (differential-mode interference) and common-mode interfere…