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电磁干扰(electro magnetic interference,EMI)滤波器是一种抑制电力电子系统中传导电磁干扰的重要手段,其中集成式EMI滤波器由于体积小、高频性能好等优点得到广泛关注。该文介绍了一种新型集成式母线型EMI滤波器,这种滤波器将传输线与滤波器相结合,通过金属导体的“集肤”与“邻近”效应对低频工作电流与高频噪声电流进行分离,并对噪声电流实现“反射”与“耗散”双重衰减。论文采用有限元法,综合考虑了母线型EMI滤波器“磁-热-流体”多物理耦合场特性,从材料选择、电气及结构参数设计、滤波性能分析、温升特性分析等方面对滤波器进行了系统性的设计,对滤波器镀层结构及厚度、滤波器最大工作电流密度等具有工程应用价值的参数进行了详细计算,并给出了参考数值。母线型EMI滤波器滤波测试效果及温升实验表明滤波器具有较好的滤波性能和较强的载流能力,具有进一步开发并实际应用的前景。
Electromagnetic interference (EMI) filter is one of the important means to suppress conducted electromagnetic interference in power electronic system. Among them, integrated EMI filter attracts much attention due to small size and high frequency performance. This paper presents a new integrated bus-type EMI filter that combines a transmission line with a filter to control the low-frequency operating current and high through the metal conductor’s “skin” and “adjacent” effects Frequency noise current separation, and the noise current to achieve “reflection ” and “dissipation ” double attenuation. In this paper, finite element method is used to consider the characteristics of multi-physics coupling field of bus-type EMI filter “magnetic-heat-fluid ”. From the material selection, electrical and structural parameter design, filtering performance analysis and temperature rise characteristic analysis The filter has been systematically designed, and the parameters of engineering application such as the structure and thickness of the filter coating, the maximum operating current density of the filter are calculated in detail, and the reference values are given. Bus-type EMI filter filter test results and temperature rise experiments show that the filter has good filtering performance and strong current-carrying capacity, with further development and practical application prospects.