Level pinning of anti-PT-symmetric circuits for efficient wireless power transfer  

作　　者：Zhiwei Guo Fengqing Yang Haiyan Zhang Xian Wu Qiong Wu Kejia Zhu Jun Jiang Haitao Jiang Yaping Yang Yunhui Li Hong Chen 

机构地区：[1]MOE Key Laboratory of Advanced Micro-Structured Materials,School of Physics Sciences and Engineering,Tongji University,Shanghai 200092,China [2]Department of Electrical Engineering,Tongji University,Shanghai 201804,China [3]School of Automotive Studies,Tongji University,Shanghai 210804,China

出　　处：《National Science Review》2024年第1期210-219,共10页国家科学评论（英文版）

基　　金：supported by the National Key Research and Development Program of China (2021YFA1400602);the National Natural Science Foundation of China (NSFC;12004284and 61621001);the Fundamental Research Funds for the Central Universities (22120210579);the Shanghai Chenguang Plan(21CGA22)。

摘　　要：Wireless power transfer(WPT) technology based on magnetic resonance(a basic physical phenomenon)can directly transfer energy from the source to the load without wires and other physical contacts, and has been successfully applied to implantable medical devices, electric vehicles, robotic arms and other fields.However, due to the frequency splitting of near-field coupling, the resonant WPT system has some unique limitations, such as poor transmission stability and low efficiency. Here, we propose anti-resonance with level pinning for high-performance WPT. By introducing the anti-resonance mode into the basic WPT platform, we uncover the competition between dissipative coupling and coherent coupling to achieve novel level pinning, and construct an effective anti-parity-time(anti-PT)-symmetric non-Hermitian system that is superior to previous PT-symmetric WPT schemes. On the one hand, the eigenvalue of the anti-PT-symmetric system at resonance frequency is always pure real in both strong and weak coupling regions, and can be used to overcome the transmission efficiency decrease caused by weak coupling, as brought about by, for example, a large size ratio of the transmitter to receiver, or a long transmission distance.On the other hand, due to the level pinning effect of the two kinds of coupling mechanisms, the working frequency of the system is guaranteed to be locked, so frequency tracking is not required when the position and size of the receiver change. Even if the system deviates from the matching condition, an efficient WPT can be realized, thereby demonstrating the robustness of the level pinning. The experimental results show that when the size ratio of the transmitter coil to the receiver coil is 4.29(which is in the weak coupling region), the transfer efficiency of the anti-PT-symmetric system is nearly 4.3(3.2) times higher than that of the PT-symmetric system when the matching conditions are satisfied(deviated). With the miniaturization and integration of devices in mind, a synthetic anti-PT-symmetric sy

关 键 词：non-Hermitian system wireless power transfer anti-PT-symmetric circuits synthetic dimension METAMATERIALS 

分 类 号：TM724[电气工程—电力系统及自动化]