电动汽车无线充电系统磁屏蔽结构对能量传输线圈耦合系数的影响

人类的生活当中充斥着越来越多的电子设备,随着电子设备的广泛使用,充电就变成了一个很重要的技术问题,现有的电的各种充电设备大多采用的是有线充电的方法,然而传统的有线充电存在着一系列的弊病,例如:灵活性差,容易产生接触火花,雨雪天气电源线绝缘皮容易破损造成危险,相对于这些问题,无线充电技术的优势就明显的体现出来了,无线充电指的是充电设备与电源之间没有直接的导线连接,2007在MIT提出的磁谐振耦合式无线能量传输方法之后。

基于有限元分析的无线充电线圈的铁氧体设计

电动汽车无线电能传输(WPT)线圈包括线圈本身、线圈托板和铁氧体三部分。放置在发射、接收线圈垂直方向外侧的铁氧体磁片对电动汽车无线充电系统有增大传输距离和传输效率的作用。为了实现铁氧体磁片的设计,以7.7 kW无线电能传输接收线圈为例,在有限元分析软件ANSYS建立其有限元模型,通过控制变量法对铁氧体磁片参数变化情况下线圈参数的变化进行仿真研究;分析了线圈各参数的特性和相互之间的约束关系;给出无线电能传输线圈铁氧体磁片的设计依据;最后根据分析结果搭建实物模型进行验证。实验结果表明:在线圈尺寸确定时,增加所设计的铁氧体磁片后系统的传输功率可达到7.7 kW,传输效率最高为93.5%。

磁耦合谐振式无线电能传输电动汽车充电系统研究

为研究电动汽车无线充电系统,解决电动汽车有线充电时的不安全、不便利问题,采用磁耦合谐振式无线电能传输技术,从改进传输线圈结构出发,在传输线圈外侧增加导磁体,将磁通尽可能束缚在两传输线圈之间,减小向外界的泄漏,缩短磁通在空气中的磁路长度,从而有效增强无线电能传输系统的耦合程度,大大增加传输功率,提高低频条件下的传输距离和效率。设计了具有频率自动跟踪控制的12 k W/70 k Hz高效磁耦合谐振式电动汽车无线充电系统,并进行实验研究,得到一系列传输线圈距离和负载阻抗、传输功率及传输效率之间关系的实验数据。特别地,实验结果表明在传输距离0.3 m、输入功率12.6 k W时,谐振频率为72.6 k Hz,传输效率达到94.33%。

电动汽车无线充电研究进展

电动汽车无线充电技术以其操作便捷、充电智能和运行安全等优点,引起人们的关注。本文首先介绍了电磁感应式无线充电、磁耦合谐振式无线充电两种电动汽车充电方式的基本原理,其次从传输线圈结构、谐振网络两个角度对电动汽车无线充电的关键技术进行了综述,最后讨论了该技术亟待解决的问题与未来的发展趋势。

Middle range wireless power transfer systems with multiple resonators

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.

磁谐振式线圈的优化设计

无线能量传输技术的应用领域非常广泛,磁谐振耦合无线能量传输方式的优点是:由于发射线圈和接受线圈之间是共振耦合,因此可在耦合系数很低的时候获得比传统磁感应技术高的传输效率,使有效传输距离大大增加,周边非谐振物体的存在也几乎不影响传输效率。同时接受线圈的摆放方位自由得多,且同一个发射线圈可以为多个接受线圈进行能量传输。本文主要阐述线圈电磁仿真及测试方法,线圈稀疏还是密绕的评测,并给出了频率选择及其原因。

宾州大学的永久性循环支持系统

本文描述了两种长期循环支持系统——左心室辅助装置(VAD)和全人工心脏(TAH)。其中,VAD适用于左心室损伤而右心室功能完好的病人。其植入部分包括血泵、导管、容积补偿腔、控制器、备用电池和能量传输线圈等,体外部分则由能量传输线圈、电池和电子线路单元组成。血泵和马达重约600克。通过丝杆将无刷马达的转动变成推板的直线运动。在泵舒张期,推板移开。

无线供电点亮未来

无线供电技术一直是人们关心的课题。早在上世纪初,Nicola Tesla就进行过远距离无线输电的实验研究,虽然该项计划因资金等原因中途夭折,然而。

Demonstration of topological wireless power transfer

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 applications.However,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 distance.WPT systems based on multi-relay resonators can overcome this problem,which,however,suffer from sensitivity to perturbations and fabrication imperfections.Here,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 insulator.Such a TWPT system can be modelled as a parity-time-symmetric Su-Schrieffer-Heeger(SSH)chain with complex boundary potentials.Besides,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 chain.By 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 disorder.The 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.