Common mode inductance, also known as common mode choke, commonly used in switching power supply filter common mode electromagnetic interference signal. In the board design, the common mode inductance is also the role of EMI filtering, used to suppress high-speed signal lines generated by electromagnetic radiation. In a word, common mode inductors are mainly used to isolate high-frequency crosstalk (EMI) between the inside and outside of the appliance.
Why is the common mode inductance resistant to EMI? To figure out this, we need to start from the structure of the common mode choke coil .
Common mode inductor filter circuit, La and Lb is the common mode inductor coil. The two coils are wound on the same core, the number of turns and the phase are the same (winding reverse). In this way, when the normal current in the circuit flows through the common mode inductance, the current in the same phase wound inductance coil to produce reverse magnetic field and cancel each other, this time the normal signal current is mainly affected by the coil resistance (and a small amount due to leakage Sense of the damping); when there is a common mode current flowing through the coil, due to the co-current of the common mode current, the coil will produce the same magnetic field and increase the coil inductance by choke coils manufacturers , the coil showed high impedance, Strong damping effect, in order to attenuate the common mode current, to achieve the purpose of filtering.
In fact, the filter circuit is terminated at one end and the other is terminated, and La and C1, Lb and C2 constitute two sets of low-pass filters (the low-pass filter allows the signal below the cut- But higher than the cut-off frequency of the signal can not pass the electronic filter device), can make the line on the common mode EMI signal is controlled at a very low level. The circuit can not only inhibit the external EMI signal transmission, but also can reduce the line itself when the work of the EMI signal, can effectively reduce the EMI interference intensity.
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