英飞凌推出新的应用开发套件

英飞凌科技股份公司进一步扩展了其领先的8位和16位微控制器的应用开发套件系列。此次推出的灵活的电机驱动参考设计,简化了高能效电机驱动的硬件和软件解决方案的评估和实施,缩短了客户的开发周期。该开发套件面向8位XC800和16位XE166产品系列产品,可支持先进的电机控制技术,例如磁场定向控制（FOC）和功率因数矫正（PFC）等。     

英飞凌推出新的应用开发套件

最新推出的三个应用开发套件扩大了英飞凌面向电机驱动应用的参考设计的适用范围：基于XC878和XE166的双电机驱动套件,包括从8至16位的可扩展解决方案和最高可驱动8A电流（电压为110～230V时）的功率板,支持FOC和PFC技术,从而提高电机能效。     

如何将交流感应电机转变为直流电机

在电机控制应用中,同步直流电机占据主导地位.但是在稳定可靠的定速解决方案中,交流感应电机的优势就显现出来.本文利用FOC技术实现了对电机电压矢量幅度,频率以及相位等的控制.     

使用DSC简化功率因数校正

本文描述了运用平均电流模式控制技术来设计和实现全数字功率因数校正（PFC）电路的方法。所述设计中数字信号控制器（DSc）的输入信号与通过升压电感的电流、升压转换器输出电容两端的直流母线电压,以及经整流的交流输入电压成正比,由DSC提供脉宽调制信号来控制PFC开关的导通时间。此技术旨在简化PFC,因而可整合于数字电源转换和电机控制应用中。     

交流电机控制技术的发展

近年来,交流电机控制技术不断发展,因此有必要对交流电机控制技术进行系统的总结归纳。通常来讲,交流电机的控制一般可分为两大类,即基于交流电机稳态模型的控制和基于矢量技术的控制。本文总结了交流电机控制技术的发展概况,分析了交流电机控制方法的原理,并对其优缺点进行比较,对各种控制方法的适用范围进行了归类。研究得出,要实现对电机的有效控制,需针对控制对象和应用场合,采取合适的控制方法。通过对各种控制技术性能的对比,可有效避免不同控制方法存在的缺陷,这对于改善系统性能具有重要意义。     

采用FPGA平台提升工业电机效率

最大化用以控制机械设备的电机效率的方法众多,其中之一就是采用效率更高、更先进的磁场定向控制技术来优化用电效率。为了实现上述目的,美国国家仪器公司(NI)的设计团队采用赛灵思FPGA作为其通用硬件架构——可重构I/O(RIO)的基础,以推出具有高计算性能的高灵活性嵌入式控制器。机械制造商客户以RIO为平台,在此基础上采用磁场定向控制(FOC)技术来提高电机效率。     

8位MCU具备磁场定位控制功能

磁场定向控制(FOC)技术正越来越多地应用于各种电器设备,它能够确保电机以最佳的扭矩运行:出色的动态响应可以实现精准的速度变化控制(对冼涤程序周期的各个阶段进行控制);低扭矩波动可使电机在运行、启动和停止操作时,保持平稳运转.     

产品推介

嵌入式系统英飞凌电机控制装置开发套件英飞凌推出成本较低的三相电机控制装置开发套件,该套件结合采用了具有磁场定向控制(FOC)功能的英飞凌8位XC886和XC888系列微控     

德州仪器最新评估平台加速三相无刷电机启动

日前．德州仪器（TI）宣布推出一款可启动无刷直流（BLDC）与永磁同步（PMSM）电机的完整电机控制评估套件。该DRV8312-C2-KIT是一款高性能．低功耗、低成本的无传感器磁场定向控制（FOC）及梯形通信平台,其可帮助电机实现创新,     

业界要闻

英飞凌推出高性价比的工业和消费用电机控制装置开发套件英飞凌科技股份公司最近宣布推出成本极低的三相电机控制装置开发套件,该套件结合采用了具有磁场定向控制(FOC)功能的英飞凌8位XC886     

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.     

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.     

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.     

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.     

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.     

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.     

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