Circuit Modeling of a Wireless Power Transfer System Containing Ferrite Shields Using an Extended Impedance Expansion Method
Circuit Modeling of a Wireless Power Transfer System Containing Ferrite Shields Using an Extended Impedance Expansion Method
复制标题
使用扩展阻抗扩展方法对包含铁氧体屏蔽的无线功率传输系统进行电路建模
DOI：
10.1109/tmtt.2022.3149830
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发表时间：
2022
影响因子：
4.3
通讯作者：
Konno Keisuke
中科院分区：
文献类型：
--
作者：
Haga Nozomi;Chakarothai Jerdvisanop;Konno Keisuke
阻抗展开法（IEM）是一种基于矩量法的电路建模技术。该研究将传统的IEM扩展到包含电介质/磁性（DM）体（如铁氧体）的无线电力传输（WPT）系统。扩展IEM的优点是它可以考虑任意形状的DM体、自谐振线圈和辐射损耗，并且在得到的电路模型中，DM体上的等效电磁电流不被视为未知数。数值实验表明，扩展后的IEM适用于DM体尺寸约为介质内电磁波波长0.3倍的频率。利用扩展IEM建立了含铁氧体屏蔽的WPT系统等效电路模型，并利用全波MoM和时域有限差分（FDTD）方法进行了验证。
The impedance expansion method (IEM) is a circuit modeling technique based on the method of moments (MoM). This study extended the conventional IEM to be applied to wireless power transfer (WPT) systems containing dielectric/magnetic (DM) bodies such as ferrites. The advantages of the extended IEM are that it can consider arbitrarily shaped DM bodies, self-resonant coils, and radiation loss, and that the equivalent electromagnetic currents on DM bodies are not treated as unknowns in the resulting circuit model. Numerical experiments revealed that the extended IEM is applicable up to the frequency at which the dimensions of the DM bodies are approximately 0.3 times the wavelength of electromagnetic waves inside the medium. An equivalent circuit model of a WPT system containing ferrite shields was obtained using the extended IEM and validated using the full-wave MoM and the finite-difference time-domain (FDTD) method.