利用负反馈减少隔离变换器中的共模电磁干扰

L. Katzir, S. Singer
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引用次数: 2

摘要

在电力电子领域,提高开关电源的开关频率以减小体积和重量是一种趋势。这种趋势导致电磁干扰(EMI)排放水平的增加。众所周知,共模电磁干扰是由电源电路组成的晶体管、二极管和变压器的寄生电容开关引起的,这意味着电流流向电路的地(实际上是屏蔽)。本文提出了一种基于负反馈的共模电磁干扰抑制方法。更具体地说,在隔离型DC/DC变换器家族中,期望的EMI降低是通过补偿变压器绕组和电容器实现的。在特拉维夫大学的电力实验室中,构建了一个隔离反激变换器并进行了测试。利用频谱分析仪分析发现,开关晶体管的寄生电容产生的共模电磁干扰在变换器的低频谐波中降低了10 ~ 15 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduction of common-mode electromagnetic interference in isolated converters using Negative feedback
In the field of power electronics, there is a trend for pushing up switching frequencies of switched-mode power supplies to reduce volume and weight. This trend causes an increasing level of electromagnetic interference (EMI) emissions. It is well known that common-mode EMI is resulted in by the switching of a parasitic capacitance of transistors, diodes, and transformers the power circuit consists of, which implies current flow to ground (actually the shielding) of the circuit. In this paper a method of common-mode EMI reduction, based on a negative feedback which implies compensating current flow is presented. More specifically, desired EMI reduction in the family of isolated DC/DC converters is achieved by means of a compensating transformer winding and a capacitor. An isolated flyback converter was constructed and tested in the Power laboratory in Tel-Aviv University. Using a spectrum analyzer, it was found that the common-mode EMI created by the parasitic capacitance of the switching transistor decreased between 10 and 15 dB in the low frequency harmonics of the converter.
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