Leveraging Common-Mode Choke Leakage for Better EMI Filtering

In an ideal inductance model, magnetic flux is fully confined within the core. However, real-world inductors rarely achieve perfect coupling. Incomplete winding or loose coil structures allow part of the magnetic flux to escape, forming leakage inductance.

Common-mode inductors inherently exhibit this effect due to the spacing between their two windings. The resulting leakage flux generates differential-mode inductance, giving common-mode chokes a natural ability to suppress differential-mode noise.

This characteristic is widely applied in EMI filter design. In many conventional filters, only a common-mode inductor is used, with its leakage inductance serving as the differential-mode suppression element. In more demanding applications, designers may deliberately increase leakage inductance to strengthen differential-mode attenuation and achieve improved EMI filtering results.



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