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Commonly used in computer switching power supply filter common mode EMI signal. In the board design, the common mode inductance is also the role of the EMI filter, used to inhibit the production of high-speed signal lines of electromagnetic radiation emitted outward

Common mode inductor filter circuit, La and Lb is the common mode inductor coil. The two coils are wound on the same core, with the same number of turns and the same phase. So, when the normal current in the circuit through common mode inductance, current winding inductance coil system in the same phase generated in the reverse magnetic field and offset each other, influenced by the normal signal current is mainly controlled by the coil resistance (and a small amount of leakage caused due to damping; when there is common mode)
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