【摘要】 研究电力电子装置电磁干扰传播通道的特性,对于分析电磁干扰形成机理、指导电磁兼容预测和调试具有重要意义。在对离线式PWM变换器电磁干扰源和电磁干扰传播通道分析的基础上,通过实测和理论分析相结合的方式,建立了电磁干扰传播通道的高频模型,并进行了验证。对干扰通道模型的宽频带仿真定性地说明了高频率点上的高峰值谐振现象。蒙特卡罗法仿真表明模型参数波动在传导频段上主要影响传播通道特性的幅值。得出了共模干扰传播通道的简化模型,该模型的传递函数特性主要由数值较大的杂散参数决定。更多还原

【Abstract】 Study of the characteristics of the EMI coupling paths in power electronic equipment is helpful to analyze the EMI mechanism and improve its EMC performance. Based on the analysis of the EMI sources and coupling paths of an off-line PWM converter, a high frequency model of EMI coupling paths is built and verified by measuring and theoretical calculation. The analysis about resonance phenomenon in high frequency band is introduced by simulation. By Monte Carlo simulation method, it is found that the parameter fluctuation mainly influenced the amplitude of coupling paths in conducted band. The simplified common mode model of coupling paths is also built and its characteristics are mainly influenced by those biggish stray parameters.更多还原