| Summary: | According to the basic characteristics of inductive components and the mechanism of suppressing electromagnetic interference caused by the magnetic cores, the influence on the impedance of magnetic cores of the material type，core size and the number of turns is introduced in this paper. Meanwhile, an experiment which was based on the outdoor union of an inverter air-conditioner was designed to illustrate the relationship of impedance characteristics of a magnetic toroid and its ability to suppress electromagnetic interference. That is to say, the higher its impedance in the application is, the more it will suppress; furthermore, it needs to be evaluated according to the actual situation in the process of use because of the impedance characteristic difference between the test data and the data supplied by the manufacturer of a magnetic core, which can provide guidance for the rectification of Electromagnetic Compatibility test.
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