stract With global drivers such as better energy consumption, energy efficiency and reduction of greenhouse gases, CO 2 emission reduction has become key in every layer of the value chain. Power Electronics has definitely a role to play in these thrilling challenges. From converters down to compound semiconductors, innovation is leading to breakthrough technologies. Wide BandGap, Power Module Packaging, growth of Electric Vehicle market will game change the overall power electronic industry and supply chain. In this presentation we will review power electronics trends, from technologies to markets.
标签: Electronics Materials Power WBG for
上传时间: 2020-06-07
上传用户:shancjb
Forewords to books can play a variety of roles. One is to describe in more general terms what the book is about. That’s not really neces- sary, since Jim Sterne is a master at communicating complex topics in relatively simple terms.
标签: Intelligence Artificial Marketing for
上传时间: 2020-06-10
上传用户:shancjb
The large-scale deployment of the smart grid (SG) paradigm could play a strategic role in supporting the evolution of conventional electrical grids toward active, flexible and self- healing web energy networks composed of distributed and cooperative energy resources. From a conceptual point of view, the SG is the convergence of information and operational technologies applied to the electric grid, providing sustainable options to customers and improved security. Advances in research on SGs could increase the efficiency of modern electrical power systems by: (i) supporting the massive penetration of small-scale distributed and dispersed generators; (ii) facilitating the integration of pervasive synchronized metering systems; (iii) improving the interaction and cooperation between the network components; and (iv) allowing the wider deployment of self-healing and proactive control/protection paradigms.
标签: Computational Intelligence
上传时间: 2020-06-10
上传用户:shancjb
Artificial Intelligence (AI) has undoubtedly been one of the most important buz- zwords over the past years. The goal in AI is to design algorithms that transform com- puters into “intelligent” agents. By intelligence here we do not necessarily mean an extraordinary level of smartness shown by superhuman; it rather often involves very basic problems that humans solve very frequently in their day-to-day life. This can be as simple as recognizing faces in an image, driving a car, playing a board game, or reading (and understanding) an article in a newspaper. The intelligent behaviour ex- hibited by humans when “reading” is one of the main goals for a subfield of AI called Natural Language Processing (NLP). Natural language 1 is one of the most complex tools used by humans for a wide range of reasons, for instance to communicate with others, to express thoughts, feelings and ideas, to ask questions, or to give instruc- tions. Therefore, it is crucial for computers to possess the ability to use the same tool in order to effectively interact with humans.
标签: Embeddings Processing Language Natural in
上传时间: 2020-06-10
上传用户:shancjb
Wherever possible the overall technique used for this series will be "definition by example" withgeneric formulae included for use in other applications. To make stability analysis easy we will usemore than one tool from our toolbox with data sheet information, tricks, rules-of-thumb, SPICESimulation, and real-world testing all accelerating our design of stable operational amplifier (op amp)circuits. These tools are specifically targeted at voltage feedback op amps with unity-gain bandwidths<20 MHz, although many of the techniques are applicable to any voltage feedback op amp. 20 MHz ischosen because as we increase to higher bandwidth circuits there are other major factors in closing theloop: such as parasitic capacitances on PCBs, parasitic inductances in capacitors, parasitic inductancesand capacitances in resistors, etc. Most of the rules-of-thumb and techniques were developed not justfrom theory but from the actual building of real-world circuits with op amps <20 MHz.
标签: 运算放大器
上传时间: 2021-11-01
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在半导体制冷技术的工作性能及其优缺点研究的基础上,设计了以单片机为核心控制元件,以TEC1-12706为执行元件的半导体制冷温度控制系统。采用高精度分段式PID控制算法配合PWM输出控制的方法实现温度控制;选择数字传感器DS18B20为温度检测元件,还包含1602液晶显示模块、按键调整输入模块和H桥驱动模块等。实际测试表明,该系统结构简单易行,操作方便,工作性能优良,同时针对该系统专门设计的温控算法,使半导体制冷器能更好地适应不同工况而充分发挥其制冷制热工作特性。Based on the study of the performance and advantages and disadvantages of thermoelectric cooler(TEC)technology,a thermoelectric cooling temperature control system with single-chip microcomputer as the core control element and TEC1-12706 as the executive element was designed. High precision piecewise PID control algorithm combined with PWM output control method is adopted to realize temperature control. The digital sensor DS18B20 is selected as the temperature detection element. It also includes 1602 LCD module,key adjustment input module and H bridge drive module. The actual test shows that the system has simple structure,convenient operation and excellent performance. Meanwhile,the temperature control algorithm specially designed for the system can make the semiconductor cooler better adapt to different working conditions and give full play to its refrigeration and heating characteristics.
上传时间: 2022-03-27
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FPGA那些事儿--Modelsim仿真技巧REV6.0,经典Modelsim学习开发设计经验书籍-331页。前言笔者一直以来都在纠结,自己是否要为仿真编辑相关的教程呢?一般而言,Modelsim 等价仿真已经成为大众的常识,但是学习仿真是否学习Modelsim,笔者则是一直保持保留的态度。笔者认为,仿真是Modelsim,但是Modelsim 不是仿真,严格来讲Modelsim只是仿真所需的工具而已,又或者说Modelsim 只是学习仿真的一部小插曲而已。除此之外,笔者也认为仿真可以是验证语言,但是验证语言却不是仿真,因为验证语言只是仿真的一小部分而已,事实上仿真也不一定需要验证语言。常规告诉笔者,仿真一定要学习Modelsim 还有验证语言,亦即Modelsim 除了学习操作软件以外,我们还要熟悉TCL 命令(Tool Command Language)。此外,学习验证语言除了掌握部分关键字以外,还要记忆熟悉大量的系统函数,还有预处理。年轻的笔者,因为年少无知就这样上当了,最后笔者因为承受不了那巨大的学习负担,结果自爆了。经过惨痛的经历以后,笔者重新思考“仿真是什么?”,仿真难道是常规口中说过的东西吗?还是其它呢?苦思冥想后,笔者终于悟道“仿真既是虚拟建模”这一概念。虚拟建模还有实际建模除了概念(环境)的差别以外,两者其实是同样的东西。换句话说,一套用在实际建模的习惯,也能应用在仿真的身上。按照这条线索继续思考,笔者发现仿真其实是复合体,其中包括建模,时序等各种基础知识。换言之,仿真不仅需要一定程度的基础,仿真不能按照常规去理解,不然脑袋会短路。期间,笔者发现愈多细节,那压抑不了的求知欲也就愈烧愈旺盛,就这样日夜颠倒研究一段时间以后,笔者终于遇见仿真的关键,亦即个体仿真与整体仿真之间的差异。常规的参考书一般都是讨论个体仿真而已,然而它们不曾涉及整体仿真。一个过多模块其中的仿真对象好比一块大切糕,压倒性的仿真信息会让我们喘不过起来,为此笔者开始找寻解决方法。后来笔者又发现到,早期建模会严重影响仿真的表现,如果笔者不规则分化整体模块,仿真很容易会变得一团糟,而且模块也会失去连接性。笔者愈是深入研究仿真,愈是发现以往不曾遇见的细节问题,然而这些细节问题也未曾出现在任何一本参考书的身上。渐渐地,笔者开始认识,那些所谓的权威还有常规,从根本上只是外表好看的纸老虎而已,细节的涉及程度完全不行。笔者非常后悔,为什么自己会浪费那么多时间在它们的身上。可恶的常规!快把笔者的青春还回来! 所以说,常规什么的最讨厌了,最好统统都给我爆炸去吧!呜咕,过多怨气实在一言难尽,欲知详情,读者自己看书去吧...
上传时间: 2022-05-02
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摘要:建立了数字控制DC/DC开关电源闭环系统的s域小信号模型,采用数字重设计法针对给定的系统季数设计了数字补偿器。应用SISO Design Tool仿真平台,在伯德图分析和根轨连法的基础上设计了连续城的模拟补偿器,并进行了离散化处理。在建立系统s城模型时引入了模数转换器和数字脉宽调制发生器产生的延迟效应,使补偿器的设计考虑了采样速率对系统的影响,改善了传统离散设计的误盖。基于教字重设计法构建的数字补偿器实现了对脉宽调制信号的可编程精确控制,保证了变换器闭环工作良好的动态特性。仿真实验结果验证了所设计的数字补偿器的性能。关键词:数字控制系统;模数转换;数字重设计法;数字补偿器;数字脉宽调制1引言传统的开关电源采用模拟控制技术,使用比较器、误差放大器和模拟电源管理芯片等元器件来调整电源输出电压,存在着控制电路复杂、元器件数量多以及控制电路成型后很难修改等缺点,不利于开关电源的集成化和小型化。近年来随着微电子学的迅速发展,电源的控制也已经由模拟控制、模数混合控制,进入到数字控制阶段”,具有可编程性、设计可延续性、元件数量减少、先进的校正能力等优点。以往由于DSP等控制芯片的高成本,数字控制多用于大功率AC/DC变换器、PFC功率因数校正等场合”,而对于DC/DC高频开关电源只是实现了一些数字化的简单应用,如采用MCU提供保护、监控和通信功能。随着数字控制芯片成本的降低,数字控制也逐渐应用于DC/DC直流变换器,直接参与电源的反馈回路控制,实现了信号采样补偿和PWM调节的数字化。数字PID补偿器的设计非常关键,直接决定了电源的输出精度、动态响应等指标。近年来对DC/DC开关电源的数字补偿器的建模研究已有很多论述],主要基于数字重设计法和直接数字设计法。数字重设计是在传统模拟电源研究方法的基础上,首先将数字电源简化为一个连续的线性系统,忽略了采样保持器效应后设计模拟补偿器,然后采用双线性近似(Tustin)、匹配零极点(MPZ)等方法对其离散化得到数字补偿器。直接数字设计是直接建立零阶保持器和被控对象的离散模型,再构建包括离散补偿器的反馈系统。数字重设计和直接数字设计法在高采样速率下设计的数字补偿器性能差别不是很大,只是在低采样速率下直接数字设计更加精确。
上传时间: 2022-06-18
上传用户:zhanglei193
相信大家有移植经验的都知道,移植确实是一件非常墨迹的事情,怎么说呢,代码都是别人的,风格也是别人的,文件结构,定义之类都是别人的,看别人的东西是种进步,但是,也是一个痛苦的过程,因为有时候资料确实很少,而且有时候还是E文的,专业名词一大堆,我们根本没有办法想象工作量是多么的巨大.不过事情都是这样,你不懂他的时候他就像是巨山,但是一旦你理解他的时候,你才会感觉到原来他是那么的简单(从我的经验上来看,至少应该是这样的).好吧,闲话少说,我们就来开始我们的移植之旅把.首先,我们需要准备的东西有uCGUI3.90,这个版本是大家现在用的比较多的,效率也比较高,别人都是这么评论的,至于其他版本的,我没有接触很多,所以不能过多评论.UCGUI有三个文件夹,一个是tool,这个文件夹是用来使用一些uCgui的上位机程序,基本都是字体和模板查看之类的,在sample文件夹下面是已经别人都你写好了很多有用的东西,像跟操作系统有关的GUT×或者一些模板(后面我们会用到的自己定义的Demo),或者是gui配置.后面再 详细叙说这个文件央的功能.在Start文件夹里面,这是我们最主要的文件夹,里面就包含了uCGUI的源代码,uCGUI的作者把源代码放进vc里面进行编译了(当然,这是用标准C语言写的程序,所以我们可以放在任何C语言平台下编译而不会担心兼容性问题,这个uCGUI在这方面做的算是完美了),所以,我们可以在vc平台下写界面,然后再把代码拷进我们的下位机编译器进行编译,这样子效率就会非常高了.(像51那时候写界面就是疯狂的一次一次的烧,真是纠结.).
上传时间: 2022-06-19
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此资源是Ethercat 从站协议生成工具,可方便的生成从站协议代码,配合LAN9252的相关工具和资料,能方便的地实现Ethercat从机。
标签: Ethercat
上传时间: 2022-06-20
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