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Description: 该双恒压供水控制系统是以PLC控制为核心，变频调速技术为基础，并结合压力传感器、变频器、水泵、继电器、接触器等组成。在此系统中，PLC将压力设定值与测量值的偏差经PID运算后得到的控制量作用到变频器，从而通过变频器控制水泵的转速调节管网的压力，实现恒压供水的目的-constant pressure of the water-control system based on PLC control at the core, VVVF technology as the foundation, and the combination of pressure sensors, inverter, pumps, relays, contactors and other components. In this system, PLC will set value and pressure measurement errors by the PID analyzing the role of the volume control inverter thereby inverter control pump speed control network pressure, constant pressure to achieve the purpose of water supply
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Size: 111874 |
Author: jake |
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Description: 卫星数字电视接收系统一般由接收天线（包括馈源）、低噪声下变频器（高频头LNB）和卫星数字电视接收机三部分组成，其中天线、高频头称室外单元，卫星数字电视接收机称室内单元，或称为数字卫星电视机顶盒（Set-Top-Box），在有些场合也称为综合解码接收机（即IRD）等，是当代计算机技术、数字通信技术和微电子技术融合的结晶
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Author: cookie114 |
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Description: MATLAB程序的仿真比较。随后，针对QPsK，详细讨论了其基本原理和具体的实现算法，并进行了仿真验证，然后选用HSP502巧数字上变频芯片和HSP50214B数字下变频芯片，设计了数字调制、解调器的实现方案。最后，作为对整个数字视频图像传输系统的宏观认识，利用M户JLAB中的实时建模仿真Simullnk库对典型的视频图像传输系统一数字视频广播系统(D vB)，进行了建模、仿真和初步的分析，结果表明:在高斯白噪声的传输环境下，系统采取的一系列抗干扰措施，包括内、外码级联的信道纠错编码和先进的调制技术(o FDM)等，保证了信源信息传输的有效进行。-MATLAB simulation comparison. Then, against QPsK to discuss in detail the basic principles and specific algorithm, a simulation test, and then choose the cleverest HSP502 figures HSP50214B frequency chips and digital down conversion chips, the design of digital modulation, demodulation for the realization of the program.MJLABSimullnk(D vB):Andean white noise transmission environment, the system adopted a series of anti-jamming measures, including internal and external codes Cascade Channel advanced error correction coding and modulation techniques (o FDM), ensuring a source of information for the effective transmission.
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Author: lzy |
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Description: 该双恒压供水控制系统是以PLC控制为核心，变频调速技术为基础，并结合压力传感器、变频器、水泵、继电器、接触器等组成。在此系统中，PLC将压力设定值与测量值的偏差经PID运算后得到的控制量作用到变频器，从而通过变频器控制水泵的转速调节管网的压力，实现恒压供水的目的-constant pressure of the water-control system based on PLC control at the core, VVVF technology as the foundation, and the combination of pressure sensors, inverter, pumps, relays, contactors and other components. In this system, PLC will set value and pressure measurement errors by the PID analyzing the role of the volume control inverter thereby inverter control pump speed control network pressure, constant pressure to achieve the purpose of water supply
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Size: 111616 |
Author: jake |
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Description: :数字下变频技术是软件无线电的关键技术之一. 数字下变频技术是将宽带高速数据流信号变成窄带低速
数据流信号,这个过程就是信号的抽取. 实现抽取的关键问题是如何实现抽取前的数字滤波,特别是多级抽取时滤
波器的设计与实现. 对于一个具体信号进行多级抽取时滤波器的设计给出了一个可行的方案-: Digital down-conversion software radio technology is one of the key technologies. Digital down-conversion technology is a broadband high-speed data streams to signal low-speed data stream into a narrow-band signal, this process is the signal extraction. The realization of extraction, the key question is how to achieve pre-extraction digital filtering, especially when Multistage Decimation Filter Design and Implementation. For a specific signal when Multistage Decimation filter design are given a feasible solution
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Author: 赵平 |
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Description: 卫星数字电视接收系统一般由接收天线（包括馈源）、低噪声下变频器（高频头LNB）和卫星数字电视接收机三部分组成，其中天线、高频头称室外单元，卫星数字电视接收机称室内单元，或称为数字卫星电视机顶盒（Set-Top-Box），在有些场合也称为综合解码接收机（即IRD）等，是当代计算机技术、数字通信技术和微电子技术融合的结晶-? ? ? ??犓? ? ?? ? ???? ? ? ? ?????????? ? ? ??????? ?? ? LNB??? ?? ?? ? ? ??? Medaka?? ? ? ? ???? ?? ?? ? ? ? ??? ? ? ? ??犓? ? ?? ě?? ???? ??? ? ? ? ??犓???? Set-Top-Box???? ? ?Щ?? ? Υ?? ?? ?? ? ?? ? ?? IRD??? ?? ? ???????? ? ? ? ??? ?? ???痓?? ? ?? ε??
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Author: cookie114 |
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Description: 该书详细介绍了变频器技术的一些应用，通俗易懂，适合初级入门者学习-The book details some of the application of inverter technology, user-friendly, suitable for beginners to learn the primary
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Author: 陈琳 |
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Description: USS 网络通讯协议 西门子变频器技术应用-Siemens USS protocol converter network communication technology
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Author: wxd |
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Description: 随着数模转换器硬件的快速发展和DSP处理能力及处理速度的逐步提高，软件无线电技术在商用和军用无线电通信领域也越来越显示出其强大的吸引力。本文研究的高速中频采样和数字下变频技术是目前蓬勃发展的软件无线电领域的两项关键技术。-As advances in technology provide increasingly faster and less expensive digital hardware, more of the traditionally analog functions of a radio receiver will be replaced with software or digital hardware. The software radio has show its fascinating functions in both commercial and military wireless communication. The high speed and high resolution analog-to-digital converter and digital down-converter which are researched in this thesis are two of the key technologies in the field of software radio that is vigorously developing recently.
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Author: zc |
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Description: 文中应用软件无线电思想对数字下变频器中的几个关键技术进行了研究,对下变频各个模块所涉及到的CIC、HB、FIR等关键算法进行了讨论、提炼与总结,应用matlab软件设计了下变频器中的CIC、HB、FIR滤波器等核心模块,并将各模块融为一体从软件实现的角度完成了对系统的搭建和功能仿真.仿真结果表明,系统实现了对中频信号的下变频处理且无失真现象,大大减少了软件无线电系统数宁信号处理的运算量和数据的存储量,极大地提高了系统的实时性.-The paper application software radio digital down converter in the thinking of several key technologies have been studied for the next conversion involved in each module to the CIC, HB, FIR and other key algorithms were discussed, refined and summarized the application of matlab software design downconverter in the CIC, HB, FIR filters and other core modules, and integration of various modules from the software point of complete structures and functions of the system simulation. The simulation results show that the system achieved the right under the IF signal Frequency processing and without distortion, thus greatly reducing the number of software-defined radio system, rather the amount of signal processing operations and data storage capacity, greatly improve the system in real time.
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Author: 王楚宏 |
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Description: 电机参数自整定，根据电机参数进行PID运算，来自实际变频器真实源码，先进的C++平台，绝对的核心技术。-Motor Autotune,for Dc motor field current loop which is based on the time constant.
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Author: 小宁 |
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Description: 变频器技术讲座，这对初学者来说，是一个很好的学习和了解变频器的教程-this is a converter technology lecture,it is a good lecture to be familair with the field
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Size: 4905984 |
Author: drawsalt |
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Description: 基于正交混频的数字下变频技术研究 变频器-Based on quadrature mixing technique DDC
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Author: fei2080 |
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Description: 在过去的20余年，我国变频器行业发展十分迅速，到目前正开始趋于成熟，主要表现在国产品牌的整体技术水平迅速提高，与外资品牌的竞争正从低层次的价格竞争开始向技术竞争、品牌竞争过渡。进入21世纪以来，我国中低压变频器市场的增长速度高达20 左右，远远超过同期的GDP增速，到2008年我国中低压变频器市场容量已达111.8亿元。受金融风暴影响，2009年的市场增长速度将会大幅度下滑，但全年整个行业仍将略有增长，而且此后增长速度将很快回升。
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Author: wanglei |
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Description: 高压大功率变频器技术原理与应用.pdf，本书将的较全面，是本不错的书-Principle and application of high-pressure high-power inverter technology pdf book more comprehensive and a good book
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Author: laowang |
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Description: 三电平逆变器介绍，做大功率太阳能，风能逆变器，变频器技术-The three-level inverter, do high-power solar, wind inverter, inverter technology
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Author: gerald |
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Description: 变频器电路维修与故障实例分析以富士、松下、东元、英威腾、康沃等几种具有代表性的国内外机型电路为主线，从电路的整机构成、单元电路的故障机理、故障判断上的辨证施治、检修思路上的缜密奇妙、修理方法的新颖独到等几个方面，道出了变频器维修的方法和意义。对实际检修具有积极的释疑、指导和启发作用。本书适合作为广大电工及从事电气自动化工程、电力电子、电气传动专业的技术工程人员和设计人员的工具书和参考书。
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Author: tiandidu |
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Description: 汇川变频器资料，讲解变频器控制的，培训内容
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Author: shanshuixiliu |
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Description: 引风机是火力发电厂重要的辅助设备，传统的引风机系统采用通过调节挡板开度的方式调节风量，这种调节方式耗电量较大，以高压变频器为核心的变频调速系统以其效率高、应用范围广和节能效果显著的特点在节能改造方面得到了广泛的应用。(With the deepening of the power system, power generation companies competition
is increasingly fierce, and effectively reduce the cost of power generation, to improve the safe operation of the coefficient of the generating units and to improve economic efficiency has become the main objectives pursued by the power generation companies.)
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Author: DLJCC
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Description: 该模型是对50kW、380V、50Hz三相三电平逆变器的两个相同电路进行建模。IGBT逆变器采用SPWM技术，(8kHz载频)将直流电源从a +/-200Vdc源转换为220V AC, 50Hz。逆变器通过75kVA 220/380V变压器输入50kW电阻负载。变频器输出采用L-C滤波器滤除主要产生于8kHz开关频率倍数(Fh=n*8000 +/-k*50Hz)附近的谐波频率Fh。逆变器所需的12个逆变脉冲由PWM发生器块产生。该系统以恒定的调制指标在开环中工作。
电路1使用三电平桥块对逆变器进行建模。电路2使用独立的IGBTs和二极管块。用开/关延时块模拟死区，仅在电路1上应用。(It is easy for us)
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Author: cheng0123 |
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