A++--离线式PWM开关电源传导电磁干扰的分析研究.pdf

第23 卷 第6 期 中 国 电 机 工 程 学 报 Vol.23 No.6 Jun. 2003 2003 年6 月 Proceedings of the CSEE ©2003 Chin.Soc.for Elec.Eng. 文章编号：0258-8013 （2003 ）06-0091-05 中图分类号：TN03 文献标识码：A 学科分类号：470·4031 离线式PWM 开关电源传导电磁干扰的分析研究 和军平，姜建国 （清华大学电机工程与应用电子技术系，北京100084） RESEARCH ON CONDUCTED EMI OF AN OFF-LINE PWM SWITCHED MODE POWER SUPPLY HE Jun-ping, JIANG Jian-guo （Department of Electrical Engineering and Applied Electronic Technology, Tsinghua University, Beijing 100084, China ） ABSTRACT: In this paper, the conducted EMI characteristic 1 引言 of an off-line PWM power supply is analyzed in detail. Considering the high frequency switches as main EMI sources, 由于高速功率开关器件的普遍使用和电力电 a group of simple equations can be deduced, which describe the 子装置数量的增多，电力电子变换器产生的电磁干 typical relationship among EMI emissions, the noise sources 扰日趋强烈，已经成为电力电子技术继续进步的一 and the coupling paths. Based on the equations, a novel [1] 个重要约束 。研究电力电子装置电磁干扰源、电 measurement is proposed to characterize the conducted EMI 磁干扰耦合通道的特性及其描述方法有助于电力电 coupling paths. According to the equations and the characteristics of the coupling paths, the different roles of dv/dt 子设计人员认清电磁干扰的产生和传播机理，从而 and di/dt in high frequency switches on conducted EMI 选择有效的方法改善装置的电磁兼容性能。 emissions can be analyzed concretely. An equivalent common 通过建立包括功率半导体器件、无源元件以及 mode conducted EMI model is built according to the basic 电路连线在内的高频电路模型进行电磁干扰的仿真 coupling paths and the main stray parameters of the converte