基于SiC MOSFET同步BuckDC-DC变换器的宽频混合EMI滤波器设计  

Design of Broadband Hybrid EMI Filter in Synchronous Buck DC-DC Converter with SiC MOSFETs

作　　者：徐浩东 罗嗣勇 毕闯 孙渭薇 赵海英 刘娇健 Xu Haodong;Luo Siyong;Bi Chuang;Sun Weiwei;Zhao Haiying;Liu Jiaojian(State Grid Shaanxi Electric Power Research Institute,Xi’an 710100 China;School of Aeronautics and Astronautics/Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province University of Electronic and Technology of China,Chengdu 611731 China;State Grid Shaanxi Electric Power Marketing Service Center,Xi’an 710100 China;State Grid Xi’an South Power Supply Company,Xi’an 710061 China)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,西安710100 [2]电子科技大学航空航天学院/飞行器集群智能感知与协同控制四川省重点实验室,成都611731 [3]国网陕西省电力有限公司营销服务中心,西安710100 [4]国网西安市南供电公司,西安710061

出　　处：《电工技术学报》2024年第10期3060-3069,共10页Transactions of China Electrotechnical Society

基　　金：国网陕西省电力有限公司科技资助项目(5226KY23000H)。

摘　　要：由于SiC MOSFET在高速开关电源中的广泛应用,导致严重的电磁干扰(EMI)问题,因此EMI滤波器的设计成为研究热点。为了满足电磁兼容(EMC)标准,无源EMI滤波器可以有效地降低DC-DC变换器产生的电磁干扰,但是无源磁性器件的体积较大,不利于提高DC-DC变换器的功率密度。该文分析DC-DC变换器的电磁干扰源和噪声源阻抗特性,建立无源和有源EMI滤波器的理论模型,提出宽频混合EMI滤波器的设计方法。最后,通过实验验证宽频混合EMI滤波器对DC-DC变换器EMI的抑制效果。The high dv/dt and di/dt are generated by power electronic devices,such as SiC MOSFETs and GaN MOSFETs,during power converter switching,causing serious electromagnetic interference(EMI)problems.Therefore,EMI filter design has become a hot spot in EMI research.The traditional passive EMI filter(PEF)can effectively reduce EMI generated by DC-DC converters.Because of safety restrictions on the Y capacitor,a large-volume common-mode(CM)choke is usually used to suppress low-frequency EMI.Then,active EMI filters(AEF)are efficacious in improving the power density of power converters due to their excellent low-frequency EMI attenuation characteristics.According to the high-frequency EMI attenuation characteristics of PEF and low-frequency EMI attenuation characteristics of AEF,hybrid EMI filters(HEF)have become the mainstream for EMI suppression.Because of the demand for high power density,the size and weight of the electronic components of HEF must be considered by standardizing HEF design.Firstly,an EMI model of the synchronous Buck DC-DC converter is proposed.Common-mode(CM)and differential-mode(DM)noise source impedance models are analyzed,and CM and DM impedances are determined.Then,the CM/DM noise source of the synchronous Buck DC-DC converter is measured using a line impedance stabilization network(LISN).Secondly,according to the insertion loss(IL)requirements,a hybrid EMI filter design method is proposed.Based on the EMI model of the synchronous Buck DC-DC converter,an HEF topology is selected,and the parameters of HEF components are quantitatively designed to achieve the required IL.Finally,the topologies of PEF and AEF are analyzed,and their IL is obtained theoretically.The topology and IL of HEF are studied for the filter design.The results show that CM noise dominates in the synchronous Buck DC-DC converter,and CL structure andπ-type PEF structure effectively suppress CM and DM noises,respectively.The current-sensing current-compensating(CSCC)AEF is selected to further suppress CM noise based on noise source

关 键 词：SIC MOSFET 电磁干扰(EMI) 噪声源阻抗 混合 EMI 滤波器 

分 类 号：TM133[电气工程—电工理论与新技术]