一种适用于全桥LLC变换器的共模噪声抑制方法  

Common-mode Noise Suppression Method for Full-bridge LLC Converter

作　　者：刘颜 张方华[1] LIU Yan;ZHANG Fanghua(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学自动化学院,南京211106

出　　处：《电源学报》2021年第2期193-197,共5页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51777094)。

摘　　要：全桥LLC变换器拓扑简单,易于实现所有开关管的软开关,被广泛应用于中大功率场合。针对全桥LLC变换器,建立了变换器的共模噪声模型,分析了共模噪声源和共模噪声耦合路径,提出了基于平衡电容的共模噪声抵消方法,并给出了变压器寄生电容参数的提取方法。最后通过实验验证了模型的准确性和方法的可行性。Full-bridge LLC converters have been widely applied in medium-to-high power applications because of their simple topologies and ease of achieving soft-switching for all power switches.In this paper,the common-mode noise model of a full-bridge LLC converter is established,and the common-mode noise source and common-mode noise coupling path are analyzed.Moreover,a common-mode noise cancellation method based on balance capacitor is proposed,and the extraction method for the transformer’s parasitic capacitance is given.Finally,the correctness of the established model and the feasibility of the proposed method were verified by experimental results.

关 键 词：LLC变换器 共模 电磁干扰 噪声模型 平衡电容 

分 类 号：TM46[电气工程—电器]