反激变压器传导共模EMI特性分析  

Analysis of conducted common-mode EMI characteristics of flyback transformer

作　　者：林苏斌[1] 周云 陈为[1] 张滨[2] 陈长青[2] LIN Su-bin;ZHOU Yun;CHEN wei;ZHANG Bin;CHEN Chang-qing(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;Zhongxing Telecommunication Equipment Corporation,Shenzhen 518057,China)

机构地区：[1]福州大学电气工程与自动化学院,福州350108 [2]中兴通讯股份有限公司,广东深圳518057

出　　处：《电机与控制学报》2021年第3期97-103,共7页Electric Machines and Control

基　　金：国家自然科学基金(51777036);国防科工局重点项目(B0202);福建省自然科学基金(2017J01479);福州市科技计划项目(2018-G-69)。

摘　　要：为了研究反激变压器传导共模EMI特性的问题,在分析反激电源传导共模噪声传输机理基础上,提出了变压器可视为共模滤波器的新观点。通过理论分析变压器的容性效应,明确了影响变压器共模噪声抑制能力的关键因素,优化设计变压器绕组结构,改变原副边绕组间的容性分布参数,可改善变压器的传导共模EMI特性。最后,通过一台反激电源样机进行了实验验证,实验结果表明优化变压器绕制方式或连接方式,可有效抑制电路的共模噪声。In order to study the characteristics of conducted common mode EMI of flyback transformer,based on the analysis of the transmission mechanism of conducted common-mode noise in flyback power supply,a new viewpoint that transformer can be regarded as common-mode filter was proposed.Through the theoretical analysis of the capacitive effect of transformer,the key factors affecting the common-mode noise suppression ability of transformer were defined.By optimizing the structure of the transformer winding and changing the capacitance distribution parameters between the primary and secondary windings,the common-mode EMI characteristics of the transformer were improved.Finally,a prototype of flyback power supply was tested.The experimental results show that the common-mode noise of the circuit can be effectively suppressed by optimizing the winding mode or connection mode of the transformer.

关 键 词：反激变压器 容性效应 共模噪声 分布参数 传导EMI特性 

分 类 号：TM46[电气工程—电器]