Effects of stray capacitances between transformer windings on the noise characteristics in switching power converters

K. Harada, T. Ninomiya, Hisanobu Kakihara
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引用次数: 5

Abstract

In switching-mode power converters, transformers are frequently used for the dc isolation between input and output terminals. The transformer has parasitic effects such as leakage inductances and stray capacitances of windings. These parasitic effects cause the complexity of noise problems in power converters. Particularly in the transformer with nonunity turns ration of windings, the description of the noise characteristics becomes more complicated due to the stray capacitances between windings. This paper presents a high-frequency equivalent circuit of the two-winding transformer with nonunity turns ration, and describes the noise transmission characteristics of a dc-to-dc converter with a transformer. Furthermore the extension of this equivalent circuit to the three-winding transformer and the cross-noise characteristics are discussed. The above discussion are followed by the experimental results.
变压器绕组间杂散电容对开关电源变换器噪声特性的影响
在开关型电源变换器中,变压器经常用于输入和输出端之间的直流隔离。变压器具有漏电感和绕组杂散电容等寄生效应。这些寄生效应导致了电源变换器噪声问题的复杂性。特别是在绕组匝数不一致的变压器中,由于绕组间的杂散电容的存在,噪声特性的描述变得更加复杂。本文提出了一种非等匝比双绕组变压器的高频等效电路,描述了带变压器的dc- dc变换器的噪声传输特性。进一步讨论了该等效电路在三绕组变压器中的推广及交叉噪声特性。最后给出了实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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