Common-mode inductance

9 month ago

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10 month

Product details

The essence of common mode inductors

Common-mode inductance, also called common-mode choke, is a coil with the same number of turns and opposite winding directions on a closed magnetic ring. An ideal common-mode choke has a suppressive effect on the common-mode interference between L (or N) and E, but has no inductive suppressive effect on the differential-mode interference between L and N. However, the incomplete symmetry of the actual coil winding will lead to the generation of differential-mode leakage inductance.

When the signal current or power current flows through the two windings in opposite directions, the magnetic flux generated cancels each other out, and the choke presents low impedance. When the common-mode noise current (including the disturbance current caused by the ground loop, also called the longitudinal current) flows through the two windings in the same direction, the magnetic flux generated is added in the same direction, and the choke presents high impedance, thereby playing a role in suppressing common-mode noise.

Common-mode inductance is essentially a two-way filter: on the one hand, it is necessary to filter out the common-mode electromagnetic interference on the signal line, and on the other hand, it is necessary to suppress itself from emitting electromagnetic interference to the outside to avoid affecting the normal operation of other electronic equipment in the same electromagnetic environment.

Common-mode chokes can transmit differential-mode signals. They allow DC and very low-frequency differential-mode signals to pass through, but present a large impedance to high-frequency common-mode noise. Therefore, they can be used to suppress common-mode current disturbances.

Our main products are Electronic Transformer、I-type Inductor、Common Mode Inductor and so on.

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Xuzhou Jiuli Electronics Co., Ltd

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10 month

Main Product: Electronic Transformer, High-frequency Transformer, Switching Power Supply Transformer , Differential Mode Inductor, I-type Inductor, Common Mode Inductor

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