Understanding and managing common-mode disturbances in isolated DC/DC converters is crucial for passing EMC tests. This article sheds light on the myths surrounding the reduction of common-mode disturbances, which are often considered complex and based on trial and error. For minimization, a common-mode choke is almost exclusively recommended as the method of choice. However, this perspective neglects that common-mode disturbances can also be explained using basic electrical interactions or parasitic elements and Kirchhoff's law. The creation of the foundations for understanding the generation and propagation of common-mode disturbances, as well as an approach using a formula for designing a simple filter to minimize common-mode disturbances, is the subject of this article.
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