纳米晶高频变压器漏磁通磁芯涡流损耗分析  

Analysis of Core Eddy Current Loss Caused by Leakage Flux in Nanocrystalline High-frequency Transformer

作　　者：刘学 赵鲁[1] 马呈瑶 范恩泽 葛琼璇[1] LIU Xue;ZHAO Lu;MA Chengyao;FAN Enze;GE Qiongxuan(Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《电气传动》2025年第3期27-34,共8页Electric Drive

基　　金：中国科学院青年创新促进会项目(2020146);北京市自然科学基金-丰台轨道交通前沿研究联合基金(L201005)。

摘　　要：高频变压器是串联谐振型DC/DC变换器中至关重要的组成部分,其稳定运行对于电源系统的可靠性、效率和功率密度都具有决定性的影响。纳米晶磁芯因其高饱和磁通、高磁导率、低矫顽力以及高频损耗低等优点而被广泛应用。为了提高DC/DC变换器的功率密度,高频变压器漏感被普遍用作谐振电感,以实现开关器件的软开关特性。然而,纳米晶合金具有较高的电导率,当高频漏磁通垂直穿过其表面带材时,将会感应出较强的涡流,从而引起潜在的热问题,这将对变压器及系统的稳定安全运行造成一定的影响。提出一种改进的高频变压器有限元仿真方法,通过建立独立的磁芯边缘纳米晶带材的三维模型,在漏感较大时,用于确定高频漏磁通感应时附加涡流损耗的分布特性,并用温升实验验证了其正确性。High-frequency transformers are an essential component in series-resonant DC/DC converters,and their stable operation has a decisive impact on the reliability,efficiency,and power density of power supply systems.Nanocrystalline magnetic cores are widely used due to their advantages of high saturation magnetic flux,high magnetic permeability,low coercivity,and low high-frequency losses.In order to improve the power density of DC/DC converters,the leakage inductance of high-frequency transformers is commonly used as a resonant inductor to achieve the soft-switching characteristics of the switching devices.However,nanocrystalline alloys possess a high electrical conductivity,and when high-frequency leakage magnetic flux passes perpendicularly through the surface strip,it induces strong eddy currents,which could result in potential thermal issues,thereby compromising the stable and safe operation of the transformer and the system.An improved finite element simulation method for high-frequency transformers was proposed for determining the distribution characteristics of additional eddy current losses induced by high frequency leakage flux at large leakage inductance by building a three-dimensional model of nanocrystalline strips at the edge of the independent core,and its validity was verified by temperature rise experiments.

关 键 词：纳米晶磁芯 高频变压器 漏感 涡流损耗 

分 类 号：TM433[电气工程—电器]