反激变流器共模干扰的建模与预测  

Modeling and predicting for common mode noise disturbance in Flyback converter

作　　者：孟培培[1] 张军明[1] 陈恒林[1] 钱照明[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2012年第9期1702-1707,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50807047;50907061);浙江省自然科学基金资助项目(Y1110120)

摘　　要：以反激变流器为对象,分析共模干扰的产生与耦合机理,建立共模干扰耦合通路模型.该模型包含共模通路中无源元件的高频阻抗特性、有源元件在不同工作模态下的等效阻抗,以及变压器的分布参数模型.与变压器集中参数模型相比,分布参数模型能够准确地描述变压器中的高频寄生参数,具有更好的高频特性.在Matlab Simu-link仿真软件中建立了共模干扰耦合通路仿真模型,并提取该反激变流器共模干扰耦合通路的等效阻抗.利用该共模干扰耦合通路模型可在整个传导频率范围(0.150～30MHz)内准确地预测反激变流器所产生的共模干扰,与接收机实测频谱的比较验证了该共模模型的准确性.After investigation into the common-mode （CM） noise generation and coupling mechanism in Flyback converter, a CM noise coupling path model of Flyback converter was proposed. This model in- cludes the high frequency impedance of passive components in CM noise coupling path, the effective imped- ance of active components in different working stages, and the distributed parameters model of transform- er. Compared with the transformer lumped circuit model, this distributed parameters model can describe the high frequency parasitical parameters in the transformer precisely, and thus obtain better high frequen- cy characteristics. The CM noise coupling path model was built up by Matlab Simulink software, and the effective impedance of the CM noise coupling path in the Flyback converter was also extracted. With the proposed CM noise model proposed in this paper, the CM noise caused by the converter can be predicted precisely in the whole conduction range （0. 150 -30 MHz）. Comparison between the testing spectrum with EMI receiver and the predicting spectrum verified the proposed CM model.

关 键 词：电磁兼容 共模干扰 反激变流器 高频模型 

分 类 号：TM46[电气工程—电器]