基于TOP247Y多路隔离输出开关电源的设计

介绍了一种采用TOP247Y芯片设计的多路隔离输出开关电源。在阐述其工作原理的基础上给出了利用PI Transformer Designer软件设计变压器的方法,完成了多路隔离输出开关电源的设计,并完成了样机制作,其结构简单,操作方便。实验结果表明：该电源动态性能良好,稳定性高,可用作IPM模块的专用驱动电源以及其他外围电路工作电源。文中提供了一种高效、快捷、灵活的电源设计方案。     

基于TOP243Y的单片反激开关电源设计

介绍了一种具有多路输出的单端反激式开关电源的设计方法,给出了利用单片开关电源集成芯片TOP243Y的电源设计实例,对外围输入EMI滤波电路、钳位电路、高频变压器、输出整流滤波电路等部分的设计过程进行了详细的分析和说明,并对设计样机进行组装和调试。     

CO2激光器电源的数字化控制

传统的模拟控制方式的PFC在电路调试时需要修改电路元器件的参数,显得非常麻烦,而且抗干扰能力很差.文章介绍了一种由TMs320LF2407A DSP作为控制芯片的激光器电源,用高运算速度的控制芯片代替了传统的UC系列作为PFC的控制单元,具有调试方便,抗干扰能力强的特点.同时,用其PWM输出管脚的脉宽调制波经过驱动电路放大后作为IGBT的驱动信号.这种电路实现了PFC及脉宽调制的数字化.     

一种具有二次接线拔插功能的电源变压器的研究与应用

目前10kV电力线路上,实现馈线自动化功能(FA)的馈线终端(FTU)所需的220V电源通过10kV线路上电源变压器将10kV电压转化为220V所得,此种10kV电源变压器是一种输出的220V电压并提供装置电源及电压时间型开关的控制电源.该类型电源变压器广泛应用在10kV智能配网上.但是在电源变压器安装、调试过程中,发现电源变压器二次接线不易接线、易接错等诸多问题,为了解决以上问题,提出了一种具有二次接线拔插功能的电源变压器进行相关研究及应用.     

模块电源中平面变压器的设计与应用

本文基于开关电源中变压器的工作原理和平面变压器自身特点,对模块型开关电源中的平面变压器的设计、加工、工艺和应用进行了全面研究.明确指出平面变压器在各种常见电路拓扑中的适用性问题,给出了平面变压器设计的参数计算过程,并进行了具体实例的参数计算.介绍了电路板绕组设计、平面变压器装配和电源整机工艺设计,给出了平面变压器和电源整机实际设计与应用案例,并对整机进行性能测试,验证了设计的可行性及合理性.     

基于2SD315AI的静电除尘用高频高压电源研制

研制了一种新型的用于除尘系统的大功率高频高压供电电源.给出了电源主电路和控制电路的设计过程,着重研究了基于2SD315AI模块的驱动电路设计.电源的主电路由整流电路、逆变电路、高频变压器和高压整流电路组成;控制电路由主控芯片、升压调理电路、驱动电路和故障反馈电路组成.实验结果表明文中设计的控制电路及驱动电路工作稳定,性能较好能够满足大功率高频高压除尘电源的需求.     

四旋翼飞行器系统设计

四旋翼是一种具有四个螺旋桨的飞行器。文章分为两个部分介绍四旋翼的设计,第一部分介绍了四旋翼飞行控制器的硬件电路设计,主要包括STM32F103最小系统、数据采集模块、通信模块、电源管理模块和辅以调试的遥控系统的电路设计;第二部分介绍了四旋翼飞行器系统软件的设计,主要包括电源监测、姿态解算、PID控制及无线调试平台的实现。经过多次的测试与分析,该系统达到了可靠控制、飞行稳定的要求。     

基于FPGA的4路HD-SDI光纤传输系统

介绍了一种基于FPGA和高速串行复/分接芯片实现多路高清视频信号无损传输的设计方案.详细描述了4路高清视频信号通过一根光纤实现远距离、无损传输的设计原理——发送端、接收端和硬件设计,以及FPGA模块的调试方法.     

一种高稳定度速调管聚焦磁场电源的研制

介绍了一种高稳定度速调管聚焦磁场电源的具体性能指标和实现方案,着重讨论了主回路、驱动电路、保护电路的原理,实际调试中所需要注意的问题,以及关键元器件的设计和选择方法。     

现代通信系统电源设计

通信设备使用的电源器件有很多种，从前端的功率因数校正(PFC)AC／DC电源到后端的高效DC／DC模块和负载点(POL)转换器，不一而足。从需要很高效率的中间总线转换器(IBC)，到那些日趋细小轻巧的VoIP数字电话，以及要求多路紧密调节电压(7～13路输出)的数字用户线(xDSL)电源等，DC／DC电源在现代通信中获得了广泛应用。     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.