In this article, topology optimization was used to design a magnetic core structure on a π-type filter circuit. The newly designed magnetic core canceled the noise generated by conducted and induced currents, and as a result, showed dramatically improved electromagnetic interference (EMI) filter performance. Topology optimization was executed using three-dimensional electromagnetic field analysis to capture the magnetic coupling effect. The designed magnetic core was fabricated by machined milling and its performance was evaluated by measuring the noise reduction effect of a simple EMI filter equipped with the core. The EMI filter equipped with our optimized magnetic core showed about 30 dB higher performance than a filter with conventional ring-shaped cores.These results show that the performance of an EMI filter can be improved by optimizing the structure of its magnetic core.

中文翻译：

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采用拓扑优化设计的磁耦合 EMI 滤波器的制作和评估


本文采用拓扑优化的方法设计了π型滤波器电路上的磁芯结构。新设计的磁芯消除了传导电流和感应电流产生的噪声，从而显着提高了电磁干扰 (EMI) 滤波器性能。使用三维电磁场分析来执行拓扑优化以捕捉磁耦合效应。设计的磁芯通过机加工铣削加工而成，并通过测量配备该磁芯的简单 EMI 滤波器的降噪效果来评估其性能。配备我们优化磁芯的 EMI 滤波器的性能比采用传统环形磁芯的滤波器高出约 30 dB。这些结果表明，通过优化磁芯结构可以提高 EMI 滤波器的性能。