【摘要】 在分析反激变换器共模噪声传输机理分析基础上，推导了反激变压器共模端口有效电容的数学模型；建立了基于电磁场仿真软件的反激变压器共模特性评估模型，搭建了基于网络分析仪的反激变压器共模特性演示和评估平台以及基于信号发生器、示波器的简易实验测试方法。包含噪声传输机理分析、电磁场有限元仿真建模、实验测试验证的实际工程案例分析，培养学生解决复杂工程问题的能力，为电磁兼容原理与设计课程中电磁干扰噪声的分析、诊断与抑制提供了实验教学条件支撑。更多还原

【Abstract】 High frequency transformer is a key device that affects the EMC characteristics of switching power supply. It plays an important role in the transmission and suppression of electromagnetic interference noise. The analysis and design of electromagnetic compatibility characteristics of switching power supply involves high-frequency magnetic field and electric field. The transmission mechanism is complex. There are many pre courses required to master its mechanism and it is difficult to learn. Based on the analysis of common mode noise transmission mechanism of flyback converter, the mathematical model of effective capacitance at common mode port of flyback transformer is deduced in this paper; The common mode characteristic evaluation model of flyback transformer based on electromagnetic field simulation software is established, and the demonstration and evaluation platform of common mode characteristic of flyback transformer based on network analyzer and simple experimental evaluation method based on signal generator and oscilloscope are built. Through the analysis of noise transmission mechanism, finite element simulation modeling of electromagnetic field and the analysis and explanation of practical engineering cases of experimental testing verified, it helps to cultivate students’ ability to solve complex engineering problems, and provides effective teaching conditions for the analysis, diagnosis and suppression of electromagnetic interference noise in the course of electromagnetic compatibility principle and design.更多还原