Nonlinear Resonant Circuits for Coupling-Insensitive Wireless Power Transfer Circuits
Nonlinear Resonant Circuits for Coupling-Insensitive Wireless Power Transfer Circuits
复制标题
用于耦合不敏感无线功率传输电路的非线性谐振电路
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Mortazawi
中科院分区：
文献类型：
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作者：
Omar Abdelatty;Xiaoyu Wang;A. Mortazawi
无线电力传输（WPT）技术预计将对从电动汽车充电到移动的设备等许多应用产生重大影响。当前WPT技术的主要限制是其功率传输效率（PTE）依赖于发射器（TX）和接收器（RX）之间的相对位置。在本文中，一类特殊的非线性谐振电路的耦合不敏感的WPT电路的设计。这种电路保持恒定的PTE，而耦合因子（k）以固定的工作频率变化。利用无源非线性器件设计了一种自适应非线性WPT电路，无需调谐工作频率或采用任何有源反馈和控制电路。所提出的WPT电路原型能够在2.25 MHz下传输60 W，同时在5 cm至25 cm范围内保持85%的恒定PTE。与传统的WPT电路相比，传输范围显著扩展了至少200%，而最短传输距离处的PTE提高了约400%。
Wireless power transfer (WPT) technology is expected to significantly impact many applications ranging from charging of electric vehicles to mobile devices. A major limitation of current WPT technology is its power transfer efficiency (PTE) dependence on the relative position between the transmitter (TX) and receiver (RX). In this paper, a specific class of nonlinear resonant circuits is introduced for the design of coupling-insensitive WPT circuits. Such circuits maintain constant PTE while the coupling factor (k) varies at a fixed operating frequency. A self-adaptive nonlinear WPT circuit is designed using passive nonlinear devices without tuning the operating frequency or employing any active feedback and control circuitry. The presented WPT circuit prototype is capable of transferring 60 W at 2.25 MHz while maintaining a constant PTE of 85% from 5 cm to 25 cm. Compared to conventional WPT circuits, the transmission range is significantly extended by at least 200 % while PTE at the shortest transmission distance is improved by approximately 400%.