Analysis and Evaluation of Air-core Two-coil Wireless Power Transfer System Configurations

2021 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2021-06-14 DOI:10.1109/APEC42165.2021.9487154

Yuankun Zhao, J. A. Abu Qahouq

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引用次数: 2

Abstract

This paper presents the analysis and evaluation results of different air-core two-coil wireless power transfer (WPT) configurations to achieve maximum power transfer efficiency for the frequency range below 1 MHz. Simplified two-port network circuit model based on experimentally measured parameters is used to evaluate the different two-coil configurations for short range power transmission. The configuration design of the wireless coils impacts the energy transfer efficiency of the WPT system. Three different WPT coils configurations for air-core WPT systems are compared based on the scattering parameters. Different two-coil configurations are obtained from several combinations of flat spiral coils and helical coils. The results show that the flat spiral coil pair configuration achieves a power transfer efficiency of ~68% without ferrite when the coil pairs are well aligned. However, its efficiency decreases rapidly when the misalignment increased. On the other hand, the presented configuration of one helical coil inside another larger helical coil achieves higher power transmission efficiency of ~72% without ferrite. It is also easier to be aligned and maintain alignment compared with the flat spiral coil pair.

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空芯双圈无线电力传输系统配置分析与评价

本文给出了在1mhz以下频率范围内实现最大功率传输效率的不同空芯双圈无线功率传输(WPT)配置的分析和评估结果。采用基于实验测量参数的简化双口网络电路模型，对不同的双线圈配置进行了短距离电力传输的评估。无线线圈的组态设计直接影响到WPT系统的能量传输效率。从散射参数的角度比较了空芯WPT系统中三种不同的WPT线圈结构。平面螺旋线圈和螺旋线圈的几种组合可以得到不同的双线圈构型。结果表明，在线圈对排列良好的情况下，扁平螺旋线圈对的功率传输效率可达68%。然而，当误差增大时，其效率迅速下降。另一方面，在没有铁氧体的情况下，一个螺旋线圈在另一个更大的螺旋线圈内的结构可以达到高达72%的功率传输效率。与扁平螺旋线圈对相比，它也更容易对齐和保持对齐。

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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2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

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