电动汽车无线充电系统通用要求重难点分析

本文分析了无线充电系统国家标准系列中存在的重难点,主要包括标准的适用范围以及互操作性要求,并且重点分析了互操作性要求的必要性和要求,对于后续国家标准的制修订具有一定的指导意义.     

美国WiTricity公司无线充电领域专利分析

为了了解一直致力于研发无线充电技术的美国重要创新型公司——WiTricity公司的核心技术的研发情况,通过专利计量的方法对该公司的专利申请情况进行详细分析。利用美国USPTO的数据,根据专利申请数量、专利申请类型、技术领域分布、技术合作、专利发明人等指标研究了WiTricity公司的专利布局和申请策略。总体来看,目前WiTricity公司仍然处在技术研发的快速增长阶段,公司的整体研发实力较强。     

英国公司推出电动汽车无线充电技术

据国外媒体报道，英国HaloIPT公司近日在伦敦利用其最新研发的感应式电能传输技术成功实现为电动汽车无线充电。在展示过程中，该公司将电能接收垫安装于雪铁龙电动汽车车身下侧，这样电池就可以通过无线充电系统进行无线充电。     

无线充电领域专利竞争态势分析

通过对无线充电领域技术专利的统计分析,包括对专利地区分布、专利权人、专利分类号及高被引专利的分析,研究了全球无线充电领域的专利竞争态势,客观地揭示了全球无线充电技术的研究状态以及我国在该领域中的研究现状和地位。并通过构建专利权人-分类号隶属网络进一步分析了企业之间的竞争关系和核心技术领域。研究结果显示,无线充电领域专利多集中在美国、韩国、日本等国家,中国的专利数量多集中在台湾地区。丰田、索尼、三星等企业在专有技术因子上的负载值很高,专利技术与无线充电领域更为密切,在核心技术创新方面具有较强竞争优势。庞巴迪运输公司、沃达丰公司、罗克韦尔国际公司在通用技术因子上的负载值很高,专利技术的通用性强、适用范围广泛,在技术应用领域竞争优势明显。     

水平偏移量对电动汽车无线充电传输效率影响分析

随着环境和能源问题日益突出,电动汽车的普及率也越来越高,无线充电由于其便利性,受到了越来越多的关注。本文介绍了无线充电的分类、原理及充电传输效率的影响因素。在线圈距离不变、不同水平偏移量条件下,对无线充电传输效率的变化情况进行研究,实验证明,随着水平偏移量的增大,其影响敏感性逐渐减弱。     

无线充电技术展望

<正>据有关数据显示,全球的无线充电装置从2009年～2019年间年增长率将超过90%。最新消息显示,诺基亚选择正在设计融合NFC技术的新机型,甚至还考虑设计可无线充电的超级手机。届时,不仅数据连接无需用连线,连充电器、电源线都可以一并取消。而依靠"i"系列产品疯狂掘金的苹果,也     

无线输电技术可为手机、电动汽车甚至是心脏起搏器充电

本文摘编自CNN（美国有线电视新闻网）科技创新频道。文章介绍TWiTricigy公司致力于实现无线输电技术的商业应用。阐述了无线输电技术的原理，目前的应用情况并展望了此技术的美好应用前景。     

基于51单片机的无线充电智能控制设计

设计无线充电电路系统,控制部分以单片机AT89S51为核心,设计蓝牙单片机接口,以手机／PC的蓝牙调试助手为人机交互界面．对无线充电开始或结束进行控制,并设计语音提示、液晶屏显示功能。该设计系统具有可控制,无线充电,能量传输效果好,无需布线等优势,有着广泛的应用前景。     

基于RFID技术与QI标准的无线充电系统

设计了基于RFD技术与QI标准的无线充电系统,旨在QI无线充电标准的基础规范下,通过无线充电技术与RFID射频识别技术的有机结合,进一步研究无线充电技术。在现有的无线充电技术基础上,拟利用电磁感应的电能传输方式,以便携式电子产品为主对象,通过RFD技术实现无线充电器对有效充电设备的ID认证后,自动根据其信息选择相应的充电情况,实现多目标无线充电,提高了无线充电技术的实用性。     

摩托Moto360曝光 防尘防水无线充电

外媒Mister Gadget带来了有关摩托罗拉智能手表Moto360更多的消息。相信看完之后，你对这款智能手表的“购买欲”，会进一步提升。价格如果合适的话。     

半桥逆变型磁共振式无线充电系统建模与控制

针对半桥谐振逆变型磁共振式无线充电(MCR-WCT)系统工作状态模糊、高阶非线性、控制理论不成熟等问题,在建立半桥谐振逆变电路等效模型的基础上,采用广义状态空间平均法(GSSA)对MCR-WCT系统进行大信号和小信号建模,在GSSA模型的基础上设计电流单闭环控制器,制定基于BP神经网络的自整定PID控制策略。最后,通过Matlab编程对GSSA大信号模型进行暂态和稳态分析,对比Simulink模型仿真结果验证GSSA模型的可行性;通过Matlab仿真对比经典PID控制和BP神经网络自整定PID控制策略,在电流设定值为1 A的阶跃响应中,BP神经网络自整定PID控制在0.25 ms内达到稳态,稳态误差在2%内,最大超调量只有5%,相比经典PID控制具有更好的动静态性能。     

国外膜工业发展概况

主要介绍了近年来国外膜工业的发展概况,特别是美国、日本、西欧以及中东等国家和地区的膜技术产业的发展现状,主要生产厂家,膜器件和产品性能以及主要膜过程,微滤(ＭＦ)、超滤(ＵＦ)、纳滤(ＮＦ)、反渗透(ＲＯ)、电渗析(ＥＤ)和气体分离(ＧＳ)的市场状况和年增长速率．     

活塞式制冷压缩机技术现状及发展趋势

活塞式制冷压缩机在制冷空调行业有着广泛的应用,本文介绍现有活塞式制冷压缩机产品的应用及技术现状,对特殊型式的活塞式制冷压缩机产品性能等进行阐述,指出活塞式制冷压缩机技术发展趋势。     

Current status and technology development tendency of research reactors in China

The current status and development history of domestic and abroad Research Reactors (RRs) are mentioned. The representative RRs and their respective technology characteristics are introduced. The utilizations of China’s RRs, mainly included as nuclear engineering technology, basic research applications of nuclear technology, teaching and personnel training, are explained.     

Analysis of triboelectric charging of particles due to aerodynamic dispersion by a pulse of pressurised air jet

Triboelectric charging of powders causes nuisance and electrostatic discharge hazards. It is highly desirable to develop a simple method for assessing the triboelectric charging tendency of powders using a very small quantity. We explore the use of aerodynamic dispersion by a pulse of pressurised air using the disperser of Morphologi G3 as a novel application. In this device particles are dispersed by injection of a pulse of pressurised air, the dispersed particles are then analysed for size and shape analysis. The high transient air velocity inside the disperser causes collisions of sample particles with the walls, resulting in dispersion, but at the same time it could cause triboelectric charging of the particles. In this study, we analyse this process by evaluating the influence of the transient turbulent pulsed-air flow on particle impact on the walls and the resulting charge transfer. Computational Fluid Dynamics is used to calculate particle trajectory and impact velocity as a function of the inlet air pressure and particle size. Particle tracking is done using the Lagrangian approach and transient conditions. The charge transfer to particles is predicted as a function of impact velocity and number of collisions based on a charge transfer model established previously for several model particle materials. Particles experience around ten collisions at different velocities as they are dispersed and thereby acquire charges, the value of which approaches the equilibrium charge level. The number of collisions is found to be rather insensitive to particle size and pressure pulse, except for fine particles, smaller than about 30 µm. As the particle size is increased, the impact velocity decreases, but the average charge transfer per particle increases, both very rapidly. Aerodynamic dispersion by a gas pressure pulse provides an easy and quick assessment of triboelectric charging tendency of powders.     

Aspects of electrostatic charging effects in high-temperature superconductors

Recent results of electrostatic charging effects on high-T _c . superconductors are reviewed. The experiments covered include field effects on superconducting thin films, field effects on weak links, and field-induced superconductivity. The emphasis is on the physical processes involved in these experiments and the prospects of using these effects to build superconducting three-terminal devices.     

Experimental study of triboelectric charging of polyethylene powders: Effect of humidity,impact velocity and temperature

The manufacturing and handling of polyethylene (PE) powders is associated with undesired charging, resulting in agglomeration of charged particles, wall sheeting and eventually leading to plugging of reactors/conveyors. In this work, we measured the triboelectric charging of PE powders using both sliding and shaking apparatuses in dependence on humidity, impact velocity of colliding particles and temperature of the colliding particles or of the wall. As expected, saturation charge of PE particles is reduced with increasing air humidity. However, in a more detailed study we observed that whenever we change the humidity, the saturation charge rapidly reaches the equilibrium value and no hysteresis in charging that might be caused, for example, by adsorption/desorption thermodynamics is observed. Saturation charge is believed to be independent of impact velocity; however, we show that the saturation charge is proportional to impact velocity in the system of PE particles of non-spherical shape. The charging is more pronounced as the temperature of PE particles increases, however, it is unchanged if only the metal wall in contact with the particles is heated. That is a different trend than observed for spherical metal particles (Greason, 2000).     

深海极端环境服役材料的研究现状与研发趋势

本文阐述了国内外深海装备与材料蚀损过程与蚀损机理的研究及深海材料研发的现状;预测了深海领域特别是深海石油钻采领域装备与材料的研发趋势;指出了深海极端环境材料研发过程中的主要科学问题.