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

National Science Review 2024年第1期11卷 215-224页

作者： Zhiwei Guo Fengqing Yang Haiyan Zhang Xian Wu Qiong Wu Kejia Zhu Jun Jiang Haitao Jiang Yaping Yang Yunhui Li Hong Chen MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Sciences and Engineering Tongji University Department of Electrical Engineering Tongji University School of Automotive Studies Tongji University

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 ***, 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 *** 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 d

关键词： non-Hermitian system wireless power transfer anti-PT-symmetric circuits synthetic dimension metamaterials

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A universal non-Hermitian platform for bound state in the continuum enhanced wireless power transfer

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Frontiers of physics 2024年第4期19卷 37-46页

作者： Haiyan Zhang Zhiwei Guo Yunhui Li Yaping Yang Yuguang Chen Hong Chen School of Physics Science and Engineering Tongji UniversityShanghai 200092China Department of Electrical Engineering Tongji UniversityShanghai 201804China

Non-Hermitian systems with parity–time(PT)-symmetry have been extensively studied and rapidly developed in resonance wireless power transfer(WPT).The WPT system that satisfies PT-symmetry always has real eigenvalues,which promote efficient energy ***,meeting the condition of PT-symmetry is one of the most puzzling *** power transfer under different transmission conditions is also a great *** state in the continuum(BIC)supporting extreme quality-factor mode provides an opportunity for efficient ***,we propose theoretically and demonstrate experimentally that BIC widely exists in resonance-coupled systems without PT-symmetry,and it can even realize more stable and efficient power transfer than PT-symmetric ***,BIC for efficient WPT is universal and suitable in standard second-order and even high-order WPT *** results not only extend non-Hermitian physics beyond PT-symmetry,but also bridge the gap between BIC and practical application engineering,such as highperformance WPT,wireless sensing and communications.

关键词： non-Hermitian physics parity-time asymmetry bound state in the continuum wireless power transfer

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Efficient and stable wireless power transfer based on the non-Hermitian physics

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Chinese Physics B 2022年第1期31卷 37-44页

作者： Chao Zeng Zhiwei Guo Kejia Zhu Caifu Fan Guo Li Jun Jiang Yunhui Li Haitao Jiang Yaping Yang Yong Sun Hong Chen MOE Key Laboratory of Advanced Micro-structured Materials School of Physics Sciences and EngineeringTongji UniversityShanghai 200092China Department of Electrical Engineering Tongji UniversityShanghai 201804China School of Automotive Studies Tongji UniversityShanghai 210804China

As one of the most attractive non-radiative power transfer mechanisms without cables,efficient magnetic resonance wireless power transfer(WPT)in the near field has been extensively developed in recent years,and promoted a variety of practical applications,such as mobile phones,medical implant devices and electric ***,the physical mechanism behind some key limitations of the resonance WPT,such as frequency splitting and size-dependent efficiency,is not very clear under the widely used circuit ***,we review the recently developed efficient and stable resonance WPT based on non-Hermitian physics,which starts from a completely different avenue(utilizing loss and gain)to introduce novel functionalities to the resonance *** the perspective of non-Hermitian photonics,the coherent and incoherent effects compete and coexist in the WPT system,and the weak stable of energy transfer mainly comes from the broken phase associated with the phase transition of parity-time *** on this basic physical framework,some optimization schemes are proposed,including using nonlinear effect,using bound states in the continuum,or resorting to the system with high-order parity-time ***,the combination of non-Hermitian physics and topological photonics in multi-coil system also provides a versatile platform for long-range robust WPT with topological ***,the non-Hermitian physics can not only exactly predict the main results of current WPT systems,but also provide new ways to solve the difficulties of previous designs.

关键词： wireless power transfer non-Hermitian physics topological edge states

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Monte-Carlo based random passive energy beamforming for reconfigurable intelligent surface assisted wireless power transfer

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Digital Communications and Networks 2023年第3期9卷 667-676页

作者： Ziyang Lu Yubin Zhao Xiaofan Li School of Microelectronics Science and Technology Sun Yat-Sen UniversityZhuhai519082China School of Intelligent System Science and Engineering Jinan UniversityZhuhai519070China

Reconfigurable intelligent surface(RIS)employs passive beamforming to control the wireless propagation channel,which benefits the wireless communication capacity and the received energy efficiency of wireless power transfer(WPT)*** beamforming schemes are classified as discrete and non-convex integer program-ming *** this paper,we propose a Monte-Carlo(MC)based random energy passive beamforming of RIS to achieve the maximum received power of electromagnetic(EM)WPT ***,the Gibbs sampling and re-sampling methods are employed to generate phase shift vector *** the sample with the maximum received power is considered the optimal *** order to adapt to the application scenarios,we develop two types of passive beamforming algorithms based on such MC sampling *** first passive beamforming uses an approximation of the integer programming as the initial sample,which is calculated based on the channel *** the second one is a purely randomized algorithm with the only total received power *** proposed methods present several advantages for RIS control,e.g.,fast convergence,easy implementation,robustness to the channel noise,and limited feedback requirement,and they are applicable even if the channel information is *** to the simulation results,our proposed methods outperform other approxi-mation and genetic *** our methods,the WPT system even significantly improves the power effi-ciency in the nonline-of-sight(NLOS)environment.

关键词： Reconfigurable intelligence surface wireless power transfer Monte-carlo algorithm Passive beamforming Gibbs sampling

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NOMA Empowered Energy Efficient Data Collection and wireless power transfer in Space-Air-Ground Integrated Networks

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China Communications 2023年第8期20卷 17-31页

作者： Cong Zhou Shuo Shi Chenyu Wu Zhenyu Xu School of Electronic and Information Engineering Harbin Institute of TechnologyHarbin 150001China Peng Cheng Laboratory Shenzhen 518055China Department of Intelligent Engineering Huizhou Engineering Vocational CollegeHuizhou 516023China

As the sixth generation network(6G)emerges,the Internet of remote things(IoRT)has become a critical ***,conventional terrestrial networks cannot meet the delay-sensitive data collection needs of IoRT networks,and the Space-Air-Ground integrated network(SAGIN)holds *** propose a novel setup that integrates non-orthogonal multiple access(NOMA)and wireless power transfer(WPT)to collect latency-sensitive data from IoRT *** extend the lifetime of devices,we aim to minimize the maximum energy consumption among all IoRT *** to the coupling between variables,the resulting problem is *** first decouple the variables and split the original problem into four ***,we propose an iterative algorithm to solve the corresponding subproblems based on successive convex approximation(SCA)techniques and slack ***,simulation results show that the NOMA strategy has a tremendous advantage over the OMA scheme in terms of network lifetime and energy efficiency,providing valuable insights.

关键词： NOMA Space-Air-Ground Integrated Networks data collection wireless power transfer resource allocation trajectory optimization

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Coupler Loss Analysis of Magnetically Coupled Resonant wireless power transfer System

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CES Transactions on Electrical Machines and Systems 2023年第1期7卷 63-72页

作者： Da Li XuSheng Wu Wei Gao Di Luo Jianxin Gao Naval University of Engineering Wuhan430000China

The demand for electric vehicles has increased over the past few *** power transfer for electric vehicles provides more flexibility than traditional plug-in charging *** couplers are critical components in wireless power transfer *** thermal effect produced by the magnetic coupler in work will cause the temperature of the device to rise rapidly,affecting the work efficiency,transfer power,operation reliability,and service *** paper modeled and analyzed each component's temperature distribution characteristics and thermal ***,the magnetic coupler's mutual inductance and magnetic circuit model are established,and the thermal model of the magnetic coupler analyzes the heat generation *** thermal models of the coupler under three different magnetic core distributions are established,and the temperature rise of each component is *** temperature rise of different parts of the coupler is verified by the temperature rise test structure of the experiment.

关键词： wireless power transfer Magnetic coupler Thermal circuit model Temperature distribution

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Achieving maximum power transfer of inductively coupled wireless power transfer system based on dynamic tuning control

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Science China(Technological Sciences) 2012年第7期55卷 1886-1893页

作者： QIANG Hao HUANG XueLiang TAN LinLin JI QingJing ZHAO JiaMing School of Electrical Engineering Southeast UniversityNanjing 210096China School of Information Science and Engineering Changzhou UniversityChangzhou 213164China

As an emerging research field,inductively coupled wireless power transfer(ICWPT) technology has attracted wide spread attention *** this paper,the maximum power transfer performances of four basic topologies labeled as SS,SP,PS and PP are *** modeling the equivalent circuits of these topologies in high frequency(HF),the primary resonance compensation capacitances for maximum power transfer capability are *** is found that these capacitances fluctuate with load resistance change,which is disadvantageous to SP,PS and PP topologies and an obstacle to their practical applications as *** solve this problem,a phase controlled inductor circuit is *** adjusting the triggering angle,the real-time dynamic tuning control can be achieved to guarantee maximum power ***,simulations and experiments show that the proposed method is of great effectiveness and reliability to solve the issue of resonance compensation capacitance fluctuation with load change and to guarantee the flexible applications of all topologies.

关键词： dynamic tuning inductively coupled topology wireless power transfer

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Circuit model based design and analysis for a four-structure-switchable wireless power transfer system

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Science China(Technological Sciences) 2015年第3期58卷 534-544页

作者： FANG XueLin LIU Hao LI GuiYang SHAO Qi LI HongYi State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences

The four-coil wireless power transfer(WPT)technology can effectively improve the transfer *** high efficiency,however,cannot be obtained along the whole transfer distance due to the phenomenon of frequency splitting in the over coupled *** at this limitation,this paper presents a switchable WPT system to improve the overall efficiency by changing the number of working *** switching conditions for the designed system are determined based on the analysis of the transfer efficiencies of four structures,which is deduced through modeling the equivalent *** simulation results well comply with the experimental results and both of them indicate that the switchable system can greatly improve the overall transfer efficiency along the whole transfer *** overall efficiency of the experimental system can reach above 70%at9.97 MHz without additional complexity,which is higher than any single structure system.

关键词： magnetic resonance coupling efficiency analysis structures switched wireless power transfer

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Middle range wireless power transfer systems with multiple resonators

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Journal of Central South University 2015年第6期22卷 2127-2136页

作者：陈新张桂香 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body (Hunan University) Department of Energy and Electrical Engineering Hunan University of Humanities Science and Technology

The equivalent two-port network model of a middle range wireless power transfer(WPT) system was presented based on strongly coupled multiple resonators. The key parameters of the WPT system include self-inductance, resistance, parasitic capacitance, mutual inductance and S-parameters of coils & resonators were analyzed. The impedance matching method was used to optimize load power and transmission efficiency of the multi-resonator WPT system, and the impedance matching method was realized through adjusting the distances between the coils and resonators. Experiments show that the impedance matching method can effectively improve load power and transmission efficiency for middle range wireless power transfer systems with multiple resonators, at distances up to 3 times the coil radius with efficiency more than 70% and load power also close to 3.5 W.

关键词： wireless power transfer middle range multiple resonators S-parameters two-port network impedance matching

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Demonstration of topological wireless power transfer

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Science Bulletin 2021年第10期66卷 974-980,M0003页

作者： Li Zhang Yihao Yang Zhao Jiang Qiaolu Chen Qinghui Yan Zhouyi Wu Baile Zhang Jiangtao Huangu Hongsheng Chen Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationCollege of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Science and Technology Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangZhejiang UniversityHangzhou 310027China International Joint Innovation Center ZJU-UIUC InstituteZhejiang UniversityHaining 314400China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological UniversitySingapore 639798Singapore Laboratory of Applied Research on Electromagnetics(ARE) Zhejiang UniversityHangzhou 310027China

Recent advances in non-radiative wireless power transfer(WPT)technique essentially relying on magnetic resonance and near-field coupling have successfully enabled a wide range of ***,WPT systems based on double resonators are severely limited to short-or mid-range distance,due to the deteriorating efficiency and power with long transfer *** systems based on multi-relay resonators can overcome this problem,which,however,suffer from sensitivity to perturbations and fabrication ***,we experimentally demonstrate a concept of topological wireless power transfer(TWPT),where energy is transferred efficiently via the near-field coupling between two topological edge states localized at the ends of a one-dimensional radiowave topological *** a TWPT system can be modelled as a parity-time-symmetric Su-Schrieffer-Heeger(SSH)chain with complex boundary ***,the coil configurations are judiciously designed,which significantly suppress the unwanted cross-couplings between nonadjacent coils that could break the chiral symmetry of the SSH *** tuning the inter-and intra-cell coupling strengths,we theoretically and experimentally demonstrate high energy transfer efficiency near the exceptional point of the topological edge states,even in the presence of *** combination of topological metamaterials,non-Hermitian physics,and WPT techniques could promise a variety of robust,efficient WPT applications over long distances in electronics,transportation,and industry.

关键词： wireless power transfer Topological metamaterials Exceptional point Su-Schrieffer-Heeger model

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