基于多物理场耦合特性的集成式母线型EMI滤波器设计

The Design of Integrated Bus-bar EMI Filter Based on the Coupling Characteristics of Multi-physical Fields

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 an important approach to suppress conducting EM1 noise in power electronic systems. Different from traditional discrete EMI filters, integrated EMI filters usually have much smaller size and better high frequency performance, which have brought them a lot of attention. In this paper, a new type integrated EMI filter, bus-bar EMI filter, is presented. The bus-bar EMI filter is the combination of transmission line and EMI filter, which can use skin effect and proximity effect to achieve the separation of work current and EMI noise current, the separated noise current is attenuated by both reflection and dissipation afterwards. With the use of finite elements method （FEM） and taken the multi-physical fields characteristics of bus-bar EMI filter into consideration, this paper has presented the systematic process of designing a bus-bar EMI filter, including choosing materials, designing electrical and structure parameters, testing noise suppression effect and temperature rise. For some important parameters, such as the thickness of nickel and the max current density applying to the filter, this paper has also given the detailed calculation method and the suggesting value. The noise suppression test and the temperature rise test show that bus-bar EMI filter has a promising application value.