High-Performance Multi-MHz Capacitive Wireless Power Transfer System for EV Charging Utilizing Interleaved-Foil Coupled Inductors
High-Performance Multi-MHz Capacitive Wireless Power Transfer System for EV Charging Utilizing Interleaved-Foil Coupled Inductors
复制标题
利用交错箔耦合电感器进行电动汽车充电的高性能多 MHz 电容式无线功率传输系统
DOI：
10.1109/jestpe.2020.3030757
复制
发表时间：
2020
影响因子：
5.5
通讯作者：
K. Afridi
中科院分区：
文献类型：
--
作者：
Brandon Regensburger;Sreyam Sinha;Ashish Kumar;Sounak Maji;K. Afridi
本文介绍了一种用于电动汽车 (EV) 充电的千瓦级大气隙电容式无线功率传输 (WPT) 系统，可实现高功率传输密度和高效率。高功率传输密度是通过在多 MHz 频率 (13.56 MHz) 下运行并利用创新设计的匹配网络来实现的，该匹配网络通过提供增益和无功补偿来实现有效的功率传输，同时吸收电动汽车充电环境中存在的寄生效应。通过在匹配网络中使用新型交错箔空芯耦合电感器，实现了高效率。与传统螺线管电感器相比，交错箔电感器在品质因数、尺寸和自谐振频率之间提供了更好的权衡，使其适合在多 MHz 频率下紧凑且高效地处理千瓦级功率。提出了交错箔概念的两种变体：半环形交错箔（STIF）电感器和环形交错箔（TIF）电感器。交错箔电感器的卓越性能通过分析公式得到证明，并通过有限元分析和测量进行验证。与最高品质因数的螺线管电感器相比，STIF 电感器的盒子体积缩小了 32%，而测量的品质因数仅降低了 3%，而 TIF 电感器则实现了更好的平衡，盒子体积缩小了 27%，测量的品质因数提高了 30%。设计、构建并测试了一个 13.56 MHz、12 cm 气隙原型电容式 WPT 系统，该系统在其匹配网络中采用品质因数为 2055 的 TIF 电感器。该系统实现了电容式电动汽车充电系统的破纪录性能，使用直径 22 厘米的耦合板传输 3.75 kW 的功率时效率高达 94.7%，相当于 49.4 kW/m2 的功率传输密度。事实证明，这种基于 TIF 电感器的原型的性能优于使用 STIF 电感器的第二种高性能原型。
This article introduces a kilowatt-scale large air-gap capacitive wireless power transfer (WPT) system for electric vehicle (EV) charging that achieves high-power transfer density and high efficiency. High-power transfer density is achieved by operating at a multi-MHz frequency (13.56 MHz), and by utilizing innovatively designed matching networks that enable effective power transfer by providing gain and reactive compensation while absorbing the parasitics present in the EV charging environment. High efficiency is achieved through the use of new interleaved-foil air-core coupled inductors in the matching networks. Interleaved-foil inductors provide a better tradeoff between quality factor, size, and self-resonant frequency compared to conventional solenoidal inductors, making them suitable for compactly and efficiently processing kilowatt-scale power at multi-MHz frequencies. Two variants of the interleaved-foil concept are presented: a semi-toroidal interleaved foil (STIF) inductor and a toroidal interleaved-foil (TIF) inductor. The superior performance of interleaved-foil inductors is demonstrated using analytical formulations, which are validated through finite-element analysis and measurements. Compared to the highest-quality-factor solenoidal inductor, the STIF inductor is shown to achieve 32% smaller box volume while having only 3% lower measured quality factor, while the TIF inductor is shown to achieve an even better tradeoff with 27% smaller box volume and 30% higher measured quality factor. A 13.56-MHz, 12-cm air-gap prototype capacitive WPT system utilizing TIF inductors with a quality factor of 2055 in its matching networks is designed, built, and tested. This system achieves record-breaking performance for a capacitive EV charging system, with an efficiency of 94.7% while transferring 3.75 kW using 22-cm-diameter coupling plates, corresponding to a power transfer density of 49.4 kW/m2. This TIF-inductor-based prototype is also shown to outperform a second high-performance prototype utilizing STIF inductors.