Application of structural winding capacitance cancellation for integrated EMI filters by embedding conductive layers

Rengang Chen, J. D. V. Wyk, Shen Wang, W. Odendaal
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引用次数: 18

Abstract

Discrete EMI filters have been used for power electronics converters to attenuate switching noise and meet EMI standards for many years. Because of the unavoidable structural parasitic parameters of the discrete filter components, such as equivalent parallel capacitance (EPC) of inductors and equivalent series inductance (ESL) of capacitors, the effective frequency range of the discrete filter is normally limited. Aiming at improving high frequency performance and reducing size and profile, the integrated EMI filter structure has been proposed based on advanced integration and packaging technologies. Some improvements have been made but further progress is limited by EPCs of the filter inductors, which is restricted by dimension, size and physical structure. In this paper, a new structural winding capacitance cancellation method for inductors is proposed. Other than trying to reduce EPCs, a conductive ground layer is embedded in the planar inductor windings and the structural capacitance between the inductor winding and this embedded layer is utilized to cancel the parasitic winding capacitance. In order to obtain the best cancellation effect, the structural winding capacitance model of the planar spiral winding structure is given and the equivalent circuit is derived. The design methodology of the layout and area of the embedded ground layer is presented. Applying this method, an improved integrated EMI filter is designed and constructed. The experimental results show that the embedded conductive layer can effectively cancel the parasitic winding capacitance, hence ideal inductor characteristics can be obtained. With the help of this embedded conductive layer, the improved EMI filter has much smaller volume and profile and much better characteristics over a wide frequency range, compared to the former integrated EMI filter and the discrete EMI filter.
嵌入导电层的结构绕组电容抵消在集成EMI滤波器中的应用
多年来,分立EMI滤波器一直用于电力电子变换器,以衰减开关噪声并满足EMI标准。由于分立滤波器元件不可避免地存在电感等效并联电容(EPC)和电容等效串联电感(ESL)等结构寄生参数,分立滤波器的有效频率范围通常受到限制。为了提高高频性能,减小尺寸和外形,提出了基于先进集成和封装技术的集成EMI滤波器结构。虽然已经取得了一些改进,但进一步的进展受到滤波电感的EPCs的尺寸、尺寸和物理结构的限制。本文提出了一种新的电感绕组电容消除方法。除了试图减少EPCs外,在平面电感绕组中嵌入导电接地层,并且利用电感绕组与该嵌入层之间的结构电容来抵消寄生绕组电容。为了获得最佳对消效果,给出了平面螺旋绕组结构的结构绕组电容模型,并推导了等效电路。介绍了嵌入式接地层的布局和面积的设计方法。应用该方法,设计并构造了一种改进型集成EMI滤波器。实验结果表明,嵌入导电层可以有效地抵消线圈的寄生电容,从而获得理想的电感特性。在这种嵌入式导电层的帮助下,与以前的集成EMI滤波器和离散EMI滤波器相比,改进的EMI滤波器具有更小的体积和轮廓,并且在更宽的频率范围内具有更好的特性。
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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