解决Qi标准中关于手机无线充电断充的方法

为了解决市面上普遍存在手机无线充电过程由于手机充电电流波动造成的无线充电充断问题,提高客户的用户体验和认可度,设计了基于Qi标准的无线充电充断解决方案。该方案设计遵循Qi标准,具备兼容性和通用性。经实验测试证明,该方案可以解决无线充电过程中由于手机充电电流波动造成的无线充电充断问题,实现5W(5V,1A)的能量传输,传输距离可以达到11mm,系统的最大效率可以达到75%。     

2012亚太电磁兼容学术会议——最佳获奖文章

Analysis of EMF Noise from the Receiving Coil Topologies for Wireless Power Transfer摘要:归纳了线圈系统中CSSR和CSPR拓扑结构的电磁噪声特性。通过等效电路模型分析和设计了监视器的无线功率传输系统。关键词:无线功率传输;线圈;等效电路模型视点:从EMF噪声的角度研究无线功率传输系统的优劣。随着无线功率传输(WPT)技术的应用,现在可使用无线充电的手机也越来越多。WPT系统一般可以分为三     

基于LCC补偿网络的无线电能传输装置的研究

无线充电性能的提高具有重要的研究意义，为了提高无线充电时的传输功率，在双边LCC补偿结构中引入中继线 圈，通过对电路模型的分析，证明加入中继线圈后系统的传输功率得到提高，同时为了减小充电过程中的损耗，采用移相和调频相结合的控制方法，实现在较宽电流调节范围内的软开关。首先通过仿真验证功率提高及软开关的实现，然后搭建谐振频率为85ｋＨｚ的无线充电实验平台，实验表明最大输出电流提高13.7％，充电电流在1Ａ~ 2.9Ａ范围内保持软开关，验证了上述改进的正确性。     

德州仪器新推无线充电方案提升便携设备移动充电体验

在WPC组织成员的努力下,无线充电技术经过三年多的开发已日趋成熟,或将成为手机等便携设备的新卖点。自2008年12月无线充电联盟(WPC)成立之日起,人们就开始对便携式设备无线充电充满了期待。如今语音与数据早已实现无线传输,而无线充电技术的成熟则将使手机等便携设备彻底摆脱线缆的困扰,未来的便携设备上面可能完全没有任何插孔。而用户也不再需要随身带着充电器,只要找到任何标准的无线充电板即可将设备放在上面完成充电。正因为此,半导体厂商们正在积极开发可以商业化的高效无线充电产品,这一功能或将成     

无线充电发射端的Qi协议控制器设计与实现

Qi协议是目前应用最广泛的无线充电功率传输标准,随着无线充电的普及,无线充电接收端的产品逐渐多样化,因此,对无线充电发射端的兼容性要求也越来越高.为了增强无线充电发射端的灵活性和普适性,文中重点研究Qi v1.2.4协议中无线充电发射端接收与发送的数据包格式,采用自顶向下的模块方法设计实现Qi协议控制器来控制数据通信,...     

无线手机充电器的制作

本文设计了一种简单实用的无线手机充电器。通过发射线圈将电能以无线方式传输出去,通过接收线圈及相关装置对手机进行无线充电,使用便捷、通用。实验证明该无线手机充电器能对多个不同型号的手机进行无线充电。     

基于电磁共振的无线充电器设计与验证

为解决手机无线充电的问题,文章提出利用电磁共振耦合原理实现电能高效传输的无线充电方式,经过调试验证,可以实现手机无线充电,并研究了距离对电磁共振方式下电能传输效率的影响。     

无线充电技术 2013年或迈入技术成熟期

未来超级本包含的技术,将允许用户在PC周围放置手机和其他设备即可实现充电。而磁共振感摩（Resonat magnetic induction）,或称磁耦合谐振（Resonant inductive coupling）就是这样一种无线传送功率的方式,其在两个线圈之间形成共振,从而实现电能的无线传输。     

业界推出首款15W Qi兼容的无线充电解决方案

<正>飞思卡尔半导体日前推出业界首款15 W Qi兼容的无线充电解决方案,进一步扩展了其无线充电产品组合,使用户距离无线物联网未来(Internet of Tomorrow)又近了一步。该解决方案为针对平板电脑、大屏幕智能手机和便携式工业及医疗设备等各种大型移动设备的超快速无线充电铺平了道路。飞思卡尔15 W无线充电解决方案的功率是普通5 W充电解决方案的3倍,能够为配有大容量电池的大     

基于PID算法的超级电容组无线恒功率充电控制分析

在对超级电容组进行直接充电时,存在功率损耗,随着时间增加,充电功率逐渐降低。采用无线恒功率充电,能恒定充电功率,拓宽应用范围。针对超级电容组进行恒功率无线充电的研究,设计了无线充电系统的硬件,并采用经典PID控制算法实现了恒功率充电。硬件设计中给出了无线电能传输环节的硬件设计、充电环节的硬件设计和超级电容组的硬件设计。软件设计中给出了PID控制算法的设计。对系统的硬件设计、无线电能传输原理、恒功率充电PID控制算法做了详细分析。实验中对硬件电路、PID控制算法进行了单独测试,得出了实际测试结果,对直接充电方式、恒压充电方式、恒流充电方式和恒功率充电方式进行了对比测试,得出实验结果曲线,并对结果做以分析,得出恒功率充电方式的优越性。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks