How does Choke Core work?

How does Choke Core work?

The choke coil is a common mode interference suppression device with a ferrite core. It consists of two coils of the same size and the same number of turns wound symmetrically on the same ferrite toroidal core to form a four-terminal device.

Choke coils are made by using the resistance of inductance to current flow. It has a suppressing effect on the large inductance of the common mode signal, and has little effect on the small leakage inductance of the differential mode signal. The choke coil used in the balanced line can effectively suppress the common mode interference signal, but has no effect on the differential mode signal normally transmitted by the line.

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