In recent years, as government agencies or other groups pay more and more attention to EMC (electromagnetic compatibility), engineers are also very careful about the radiation problem of products when designing products. It is particularly worth mentioning that the high switching frequency and peak pulse ramp of the DC converter are typical EMI (electromagnetic interference). Common mode inductor is an important anti-electromagnetic interference component, which can provide very high impedance under a wide frequency condition. Most EMI filters are mainly composed of common mode inductors. In this article, the design of common mode inductors and the selection of magnetic core materials are mainly introduced.
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