Amorphous common-mode inductors are common-mode inductors wound using magnetic rings of new amorphous nanocrystalline materials. It is a new type of common-mode inductor that is indispensable for switching power supplies, UPS power supplies and various EMI EMC power supplies. Advantages of amorphous magnetic ring common mode inductors: small size, high efficiency, wide applicable frequency. Working principle: When the operating current flows through two sets of coils wound in opposite directions, two magnetic fields that cancel each other out are generated. When electromagnetic interference or electromagnetic radiation signals flow through the coil, the high impedance of the coil produces a strong damping effect. So as to eliminate or attenuate electromagnetic interference, electromagnetic radiation, and achieve the effect of green power supply.