DSP控制的IPM正弦逆变电源系统硬件电路设计

在介绍正弦逆变电源系统主流硬件电路和控制方案的基础上,结合具体设计要求,给出逆变电源系统中整流电路和逆变电路中功率模块的选取原则,滤波电容容值的计算和应用方法,输出滤波电路中电感和电容的计算方法.设计了IPM模块的外部驱动电路和缓冲电路,并介绍了基于DSP控制的硬件保护电路和电流、电压采样处理电路.最后给出了以该电路完成的逆变电源系统的实验波形和结论,验证了该电路设计的正确性和可靠性.     

基于DSP和IPM的变频调速系统的硬件设计

介绍一种基于DSP和IPM的变频调速系统的硬件设计。该系统采用“自举”电路，采用DSP直接驱动IPM，结构紧凑。该系统已投入批量生产，并经过数年连续运行。     

DSP技术在压电被动振动控制中的应用初探

采用DSP构建合成阻抗电路替代传统的压电分流阻尼电路进行振动控制。详细分析了DSP减振电路的工作原理和实现方法。以根部粘贴有压电陶瓷片的悬臂梁系统为例,给出了DSP减振电路的单模态被动减振的实验结果,并提出了利用DSP减振电路进行多模态被动振动控制的发展方向。     

DSP与数字功放芯片DPPC2006的接口设计

介绍了专业数字音频功放芯片DPPC2006和DSP TMS320VC5409芯片的主要特点.数字音频处理系统使用了TI公司的通用DSP 作为声场处理器,根据系统和IIS数字音频格式的要求,设计了DSP与DPPC2006的数字音频接口电路,并给出了DSP的McBSP串口软件设置程序.该设计实现了DSP在数字音频系统中的应用,增强了系统的灵活性,并经实验验证了该接口电路的可靠性.     

基于DSP的PSK信号调制设计与实现

研究了数字通信系统中基DSP器件的BPSK和QtSK的信号调制电路的实现方法,并给出了基于DSP进行数字调制的实验结果,从而证明了其设计的合理性.     

一种电机FOC算法DSP系统设计及实现

本文设计了一种适用于电机矢量控制算法的数字信号处理系统的微架构定义,包括其指令集定义、存储器模型以及与主CPU的交互模式.该设计具有通过固定部分多操作数有效缩减指令编码长度提高代码密度以及后台执行多周期指令提高ALU并行效率的显著优点.文中给出了典型的FOC控制算法在DSP （Digital Signal Processor）指令集上实现的指令周期数,也给出了对应架构的电路实现情况,最终以ARM CORTEX-M0及几款主流DSP作为比较基线,通过实测实验数据证明了体系结构的高能效比,以较为有限的电路面积代价,极大提高了集成DSP的嵌入式系统的运行效率.     

全电动注塑机交流伺服驱动器的设计

结合全电动注塑机的特点,介绍了一种基于DSP的全电动注塑机交流伺服驱动器的控制原理、硬件组成和软件设计。控制电路采用DSP+FPGA,功率电路采用智能功率模块(IPM)+开关电源的设计方案,同时采用独立的主电源模块,实现多个功率电路共用母线电压,具有紧凑的系统结构。实验结果表明该伺服驱动器设计的有效性和可靠性,能够较好地满足对全电动注塑机控制精度和稳定性的要求。     

基于DSP的三相并联直流谐振开关逆变器研究

阐述了一种三相并联直流谐振开关逆变拓扑电路的工作原理,针对该系统控制电路的特点,应用DSP实现了数字化实时控制。并搭建了硬件实验平台,给出了软件设计流程。实验结果证明了该系统具有良好的性能。     

基于IPM的三相无刷直流电机控制系统的设计

以DSP为核心设计了一种基于智能功率模块（IPM）的无刷直流电机控制系统。阐述了IPM的控制策略、光耦隔离驱动、相关保护和作用,同时介绍了系统组成和断路器动作的策略,并给出了软硬件设计。实验结果表明,该控制系统可减少开关操作的涌流、过电压等暂态过程,与现有的模拟控制电路相比,其结构简单。     

基于DSP的单相光伏并网逆变电源的设计

基于光伏电池的输出特性设计了一套户用型新型单相两级式光伏并网发电逆变电源系统。该系统采用TMS320F2812 DSP作为核心处理器,前级采用改进的变步长扰动观察法控制策略的Boost DC/DC电路,后级采用智能功率模块IPM(Intelligent Power Module)作为逆变主电路。该全桥逆变电路采用倍频单极性正弦脉宽调制方式,使用过零点检测电路配合电压电流双闭环反馈PI控制策略对DSP编程实现对电网频率和相位的跟踪调节。文中详细介绍了该逆变电源的硬件设计方法及其软件控制策略,研制了试验样机。实验结果证明该光伏并网逆变电源技术方案可行。     

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.