Toroidal Common Mode Choke（Ring common mode choke），Also known as ring type common mode inductance, it is a symmetrical winding of the same direction and number of turns on a closed magnetic ring.It is often used to filter common mode electromagnetic interference, suppress the electromagnetic wave emitted from high frequency signal and improve the EMC of the system.
effect
The common-mode choke coil is essentially a bidirectional filter: on the one hand, it should filter out the common-mode electromagnetic interference on the signal line, and on the other hand, it should restrain itself from sending out electromagnetic interference to avoid affecting the normal work of other electronic equipment in the same electromagnetic environment.Common mode choke can transmit differential mode signals. Both dc and low frequency common mode signals can pass through, but for high frequency common mode noise, it presents a large impedance, which can be used to suppress common mode current interference.
The common mode choke is made of ferrite core, which can be wound with double wires or two windings independently.It has the capability of high frequency common mode noise suppression and low frequency differential mode noise signal suppression, small size, good balance, easy to use, high quality factors and other advantages.And the working frequency impedance is small, interference frequency impedance is large, inductance value is stable, thermal stability is good, there are a variety of structural forms and impedance characteristics to choose from.
1. Switching power supply noise suppression filter.
2. Power line and signal line static noise filter.
3. Converter, ultrasonic equipment and other radiation interference suppressors.
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