This article first investigates the equivalent parallel capacitance (EPC) and equivalent parallel resistance (EPR) due to the electromagnetic field inside the Mn-Zn ferrite toroidal cores of the inductors with a single-layer winding based on electromagnetic theory. From the investigation, the effects of core's cross-sectional shape and number of winding turns on the EPC and EPR are explored. A stacked core structure was studied to increase the inductor's high-frequency (HF) impedance for electromagnetic interference suppression. The article further investigated the EPC due to the electric field energy in the space between winding turns, and between the winding turns and the core. The effect of the number of winding turns on total EPC was also explored. The technique to achieve high HF impedance was proposed with an optimal number of winding turns. Both simulations and experiments were conducted to validate the developed theory and techniques.

中文翻译：

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用电磁分析建模和提高单层Mn-Zn铁氧体环形电感的高频阻抗

本文首先基于电磁理论研究了单层绕组电感的Mn-Zn铁氧体环形磁芯内部的电磁场引起的等效并联电容（EPC）和等效并联电阻（EPR）。通过调查，研究了铁心的横截面形状和绕组匝数对EPC和EPR的影响。为了抑制电磁干扰，研究了堆叠铁芯结构以增加电感器的高频（HF）阻抗。由于绕组匝之间以及绕组匝与铁心之间的空间中的电场能量，本文进一步研究了EPC。还探讨了绕组匝数对总EPC的影响。提出了具有最佳绕组匝数的实现高HF阻抗的技术。进行仿真和实验以验证所开发的理论和技术。