Conducted Emission Analysis and Suppression Design of a DC/DC Semi-isolated Power Supply

被引：0
|
作者：
Zheng, Bo [1 ]
He, Junping [1 ]
机构：
[1] Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China
来源：
2017 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY & SIGNAL/POWER INTEGRITY (EMCSI) | 2017年
基金：
中国国家自然科学基金;
关键词：
Semi-isolated SMPS; conducted emission prediction; DM EMI path; EMI filter;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper studies the conducted electromagnetic interference (EMI) problems in a DC/DC switched-mode power supply (SMPS) with semi-isolated topology. A high frequency circuit simulation model is firstly established to predict the conducted emissions of this power supply. Then the common mode (CM) and the differential mode (DM) conducted emission mechanisms of this power supply are analyzed in detail according to its working principle and structure. The voltage of the rectifier diodes at the transformer's secondary is founded to be the main CM EMI sources. A DM noise coupling phenomenon from the voltage ripple of output port is discovered and its role on EMI emission is explained too. Based on conduced emission paths analysis, three kinds of EMI filters, including traditional input EMI filter, high frequency input and output port EMI filters and a new DM topology filter are proposed to restrain the conducted emissions respectively. Their effectiveness is verified with experiments and the merits and drawbacks of different designs are also introduced.
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页码：383 / 387
页数：5
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