反激式开关电源传导干扰的研究  

Analysis on conducted interference of flyback switching power supply

作　　者：陈姝[1] 刘景夏[1] 胡冰新[1] 林莹[1] 

机构地区：[1]中国人民解放军理工大学通信工程学院,江苏南京210007

出　　处：《电源技术》2014年第4期764-765,780,共3页Chinese Journal of Power Sources

摘　　要：建立了反激式开关电源高频等效模型,分析了传导干扰的产生机理,具体说明了开关频率谐波、Q1和D1两次振荡频率和幅值与各参数间的关系。根据各参数间关系,提出了增加驱动电阻,减小变压器漏感Le和增加Cds、Cj的方法,以改善由Q1和D1带来的干扰影响,并对改善前后传导干扰产生的噪声信号进行了频谱分析对比,取得了较为理想的实验结果,在不影响原电气性能的前提下提高了电源的EMC性能。The modeling of high-frequency equivalent circuit of flyback converter was focused on and its conductive electromagnetic interference （EMI） generation mechanism was analyzed. The impact of the harmonic components of switching frequency and the oscillating voltage across MOSFET and diode on EMI was discussed. Effective approaches were proposed which could improve EMI and the results were compared and analyzed. The experimental results verify the effectiveness of the analysis.

关 键 词：反激式开关电源 传导干扰 频谱分析 电力电子 

分 类 号：TM23[一般工业技术—材料科学与工程]