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What is The Application of Common Mode Cores

Date: Dec 8th, 2022
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Common mode inductor (common mode choke coil)
Common mode choke, also known as common mode choke coil, is commonly used in switching power supplies of computers to filter common mode electromagnetic interference signals. In the board design, the common mode inductor also plays the role of EMI filter, which is used to suppress the electromagnetic wave generated by the high-speed signal line from radiating outward.
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The common mode choke coil is essentially a two-way filter: on the one hand, it needs to filter out the common mode electromagnetic interference on the signal line; normal work.

Common mode choke applications
The frequency range of common-mode noise generated by switching power supplies is from 10kHz to 50MHz or even higher. In order to effectively attenuate these noises, it is required that the common-mode inductor can provide sufficiently high inductance within this frequency range.

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