开关电源共模传导干扰模型的研究  

MODEL & ANALYSIS ON COMMON-MODE CONDUCTED EMI OF A SWITCHED MODE POWER SUPPLY

作　　者：和军平[1] 陈为 姜建国[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市海淀区100084 [2]台达能源技术(上海)有限公司,上海市浦东区201209

出　　处：《中国电机工程学报》2005年第8期50-55,共6页Proceedings of the CSEE

基　　金：福建省自然科学基金(A0210011)。

摘　　要：该文分析了一台单相小功率回扫式开关电源的传导干扰源和共模干扰传播通道,在细致分析回扫变压器绕组和屏蔽层作用的基础上,建立了开关电源的共模传导干扰电路模型。具体说明了各干扰源的作用。根据模型,提出了串联共模变压器和并联补偿绕组的方法,以改善电源输出端共模干扰的抑制效果,并进行了验证。文中对输出采用同步整流管对共模传导干扰模型的影响也进行了分析。A common-mode EMI model of a single phase flyback switched mode power supply is built after detailed analysis about EMI sources, winding voltage and shielding roles of a transformer. Its effect is validated by experiments. Based on the model, the relationships about EMI sources, coupling capacitors and common mode EMI emission are expatiated. In order to restrain EMI produced by high frequency diode at output stage of power supply, a common mode transformer method and a compensation winding method are proposed and their effects are validated of experiments. The influence on common mode EMI by a synchronous rectifier is analyzed too.

关 键 词：开关电源 干扰模型 共模干扰 回扫变压器 电路模型 传导干扰 补偿绕组 抑制效果 干扰源 小功率 屏蔽层 输出端 整流管 传播 并联 串联 

分 类 号：TN86[电子电信—信息与通信工程] TP391.9[自动化与计算机技术—计算机应用技术]