Abstract: The application note addresses how G3-PLC, a powerline communications protocol approvedby the International Telecommunications Union (ITU), enables mesh networking in advanced metering
Abstract: The number of uses for microelectromechanical systems (MEMS) is growing—they allow us todo jobs once considered impossible. This tutorial explains the applications for MEMS and the increasingneed to provide precision control and drivers for these devices. Design and manufacturing considerationsare also discussed.
Abstract: The process of designing a radio system can be complex and often involves many project tradeoffs. Witha little insight, balancing these various characteristics can make the job of designing a radio system easier. Thistutorial explores these tradeoffs and provides details to consider for various radio applications. With a focus on theindustrial, scientific, medical (ISM) bands, the subjects of frequency selection, one-way versus two-way systems,modulation techniques, cost, antenna options, power-supply influences, effects on range, and protocol selectionare explored.
Abstract: The reality of modern, small form-factor ceramic capacitors is a good reminder to always readthe data sheet. This tutorial explains how ceramic capacitor type designations, such as X7R and Y5V,imply nothing about voltage coefficients. Engineers must check the data to know, really know, how aspecific capacitor will perform under voltage.
(1 . Higher Educati on Admissi on Committee Office of L ianyungang,L ianyungang 222006, China
2 . Modern Educati on Technique Center, Huaihai I nstitute of Technol ogy, L ianyungang 222005, China)
Abstract: The outbreak ofARP cheating virus interferes with the nor mal functi oning of LAN. On the basis of thoroughly und
standing of the p rinci p les, this paper analyzes the p rinci p les, pattern and classificati ons ofARP in details . And it also discu
the tactics t o take strict p recauti ons ofARP fr om t wo sides— — —the administrati on ofLAN and Client Host . The pur pose of the
cussi on is t o guarantee the normal running of LAN users .
Key words: virus p rinci p les LAN client host
ABSTRACTThe flyback power stage is a popular choice for single and multiple output dc-to-dc converters at powerlevels of 150 Watts or less. Without the output inductor required in buck derived topologies, such as theforward or push-pull converter, the component count and cost are reduced. This application note will reviewthe design procedure for the power stage and control electronics of a flyback converter. In these isolatedconverters, the error signal from the secondary still needs to cross the isolation boundary to achieveregulation. By using the UC3965 Precision Reference with Low Offset Error Amplifier on the secondaryside to drive an optocoupler and the UCC3809 Economy Primary Side Controller on the primary side, asimple and low cost 50 Watt isolated power supply is realized.
基于DSP28335的永磁同步電機(jī)調(diào)速系統(tǒng)設(shè)計(jì)摘要（中英文） 本控制系統(tǒng)的設(shè)計(jì)是為了實(shí)現(xiàn)基于TMS320F28335的永磁同步電動(dòng)機(jī)的調(diào)速系統(tǒng)，并把它引用到全電動(dòng)注塑機(jī)當(dāng)中。本系統(tǒng)使用SVPWM的控制方法，通過采樣電機(jī)電流和旋轉(zhuǎn)變壓器的位置信息，實(shí)現(xiàn)速度、電流雙閉環(huán)控制。通過TMS320F28335的硬件浮點(diǎn)處理核心，實(shí)現(xiàn)應(yīng)用于永磁同步電機(jī)的浮點(diǎn)算法，去取代過去的定點(diǎn)算法，提高代碼效率。 Abstract: The control system is designed to realize TMS320F28335 based on the permanent magnet synchronous motor speed control system, and put it to quoting all electric of injection molding machine. The ystem of the control method used SVPWM, through the sampling motor current and rotating transformer 1. 引言1.1 設(shè)計(jì)背景及目的 本永磁同步電機(jī)調(diào)速系統(tǒng)是全電動(dòng)注塑機(jī)的其中一個(gè)應(yīng)用部分。全電動(dòng)注塑機(jī)憑借著其節(jié)約能源、清潔、噪聲少、速度控制效果好、精度高、可重復(fù)性高、成本低等眾多優(yōu)點(diǎn)，成為了當(dāng)下高端注塑機(jī)發(fā)展的一個(gè)方向。 全電動(dòng)注塑機(jī)的所有運(yùn)動(dòng)機(jī)構(gòu)都采用交流伺服電動(dòng)機(jī)驅(qū)動(dòng)，一個(gè)穩(wěn)定高效的永磁同步電動(dòng)機(jī)驅(qū)動(dòng)方案成為了全電動(dòng)注塑機(jī)性能的一個(gè)總要部分。本次設(shè)計(jì)以適用于全電動(dòng)注塑機(jī)的永磁同步電動(dòng)機(jī)控制系統(tǒng)為目標(biāo)進(jìn)行設(shè)計(jì)，采用TI公司的TMS320F28335作為控制核心。憑借TMS320F28335高速的運(yùn)算能力，適用于電動(dòng)機(jī)控制的各種外設(shè)，以及TMS320F283XX特有的硬件浮點(diǎn)運(yùn)算能力，進(jìn)行永磁同步電動(dòng)機(jī)的調(diào)速控制系統(tǒng)的設(shè)計(jì)。
At the heart of Java technology lies the Java virtual machine--the abstract computer on which all Java programs run. Although the name "Java" is generally used to refer to the Java programming language, there is more to Java than the language. The Java virtual machine, Java API, and Java class file work together with the language to make Java programs run.
The core of Java(TM) technology, the Java virtual machine is an abstract computing machine that enables the Java(TM) platform to host applications on any computer or operating system without rewriting or recompiling. Anyone interested in designing a language or writing a compiler for the Java virtual machine must have an in-depth understanding of its binary class format and instruction set. If you are programming with the Java programming language, knowledge of the Java virtual machine will give you valuable insight into the Java platform s security capabilities and cross-platform portability. It will increase your understanding of the Java programming language, enabling you to improve the security and performance of your programs.
