Position-Insensitive Wireless Power Transfer Based on Nonlinear Resonant Circuits
Position-Insensitive Wireless Power Transfer Based on Nonlinear Resonant Circuits
复制标题
DOI：
10.1109/tmtt.2019.2904233
复制
发表时间：
2019-09-01
影响因子：
4.3
通讯作者：
Mortazawi, Amir
中科院分区：
文献类型：
--
作者：
Abdelatty, Omar;Wang, Xiaoyu;Mortazawi, Amir
基于近场谐振的无线电力传输（WPT）技术对从生物医学植入物的充电到电动汽车（EV）的许多应用都有重大影响。强大的WPT系统的设计由于其位置依赖性功率传递效率（PTE）而具有挑战性。在本文中，提出了一种新方法，以解决WPT对发射线圈和接收线圈之间耦合因子变化的强烈敏感性。引入的技术依赖于利用特定类别的非线性共振电路的独特性能来设计对位置不敏感的WPT系统，这些系统在较大的传输距离和未对准的情况下保持较高的PTE，而无需调整源的操作频率或使用可调的匹配网络，以及任何主动反馈/控制电路。设计和制造的基于非线性振动的WPT电路，能够以2.25 MHz传输60W。该电路在20 cm的传输距离变化上保持高度为86％。此外，发射功率和PTE在较大的横向错位上保持，高达+/- 50％的线圈直径和角度未对准，最高为+/- 75度。新的设计方法通过显着扩展了维持负载功率和高PTE的耦合因子的范围，从而增强了WPT系统的性能。
Near-field resonant-based wireless power transfer (WPT) technology has a significant impact in many applications ranging from charging of biomedical implants to electric vehicles (EVs). The design of robust WPT systems is challenging due to its position-dependent power transfer efficiency (PTE). In this paper, a new approach is presented to address WPT's strong sensitivity to the coupling factor variation between the transmit and receive coils. The introduced technique relies on harnessing the unique properties of a specific class of nonlinear resonant circuits to design position-insensitive WPT systems that maintain a high PTE over large transmission distances and misalignments without tuning the source's operating frequency or employing tunable matching networks, as well as any active feedback/control circuitry. A nonlinear-resonant-based WPT circuit capable of transmitting 60 W at 2.25 MHz is designed and fabricated. The circuit maintains a high PTE of 86% over a transmission distance variation of 20 cm. Furthermore, transmit power and PTE are maintained over a large lateral misalignment up to +/- 50% of the coil diameter and angular misalignment up to +/- 75 degrees. The new design approach enhances the performance of WPT systems by significantly extending the range of coupling factors over which both load power and high PTE are maintained.