考虑直流偏磁和非正弦激励影响的高频变压器磁芯损耗修正模型

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图分类号：TM401 文献标志码：A 文章编号：1007-449X（2025）07-0085-11

Core loss correction model of high-frequency transformer considering influence of DC bias and non-sinusoidal excitation

ZHANG Xian1，2， CHEN Fangyu1，²， SONG Wenle³， WANG Lei³， LIU Chengyu4， DAI Zhongyu1，2

（1.State Key Laboratoryof Reliabilityand Intellgence of Electrical Equipment，Hebei Universityof Technology， Tianjin 300401，China；2.Hebei KeyLaboratoryofFlexible DC Transmision Equipmentand Technology，Hebei University of Technology，Tianjin 300401，China；3.State Grid Cangzhou Electric Supply Company，Cangzhou O61001，China; 4. China Electric Power Research Institute Co.，Ltd.，Beijing 1O2209，China）

Abstract：The precise calculation of core loss of high-frequency transformer is of great significance to the optimal design of power electronic devices. To solve the problem that the classical loss separation equation is less accurate in calculating core loss under non-sinusoidal voltage excitation，the trapezoidal wave and square wave were selected as non-sinusoidal excitation，and the piecewise magnetic flux density curve with waveform factor was obtained by Faraday’s electromagnetic induction law. Secondly，considering that there may be acertain degree of DC bias in the actual working state of the high-frequency transformer，the nonlinear coupling relationship between DC bias component and flux density on hysteresis loss was explored.Based on the DC bias component，the analytical formula of hysteresis losswas modified，and the improved loss separation model of the high-frequency transformer core was derived，which comprehensively considers DC bias and non-sinusoidal excitation. Finall，a magnetic core loss measurement platform was built，and the fiting parameters of the modified model were obtained through the experimental data.Eror analysis was made between the classical model and the modified model with the measured values respectively，which verified effectiveness and accuracy of the magnetic core loss correction model.

Keywords：high-frequency transformer; non-sinusoidal excitation; waveform factor; core loss;loss separation formula;DC bias

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