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pulse-width

  • 如何設(shè)計一個高效率的DC-DC轉(zhuǎn)換器

    Abstract: The DS1875 features a pulse-width modulation (PWM) controller that can be used to control aDC-DC converter. The DC-DC converter can then be used to generate the high bias voltages necessaryfor avalanche photodiodes (APDs). This application note describes the operation of a boost converterthat uses the DS1875. Discussion covers the selection of the inductor and switching frequency, and theselection of components that improve the efficiency of the converter. Test data are presented.

    標(biāo)簽: DC-DC 如何設(shè)計 高效率 轉(zhuǎn)換器

    上傳時間: 2013-10-26

    上傳用戶:lyson

  • 基于8098單片機的SPWM變頻調(diào)速系統(tǒng)

      數(shù)字控制的交流調(diào)速系統(tǒng)所選用的微處理器、功率器件及產(chǎn)生PWM波的方法是影響交流調(diào)速系統(tǒng)性能好壞的直接因素。在介紹了正弦脈寬調(diào)制(SPWM)技術(shù)的基礎(chǔ)上,設(shè)計了一種以8098單片機作為控制器,以智能功率模塊IPM為開關(guān)器件的變頻調(diào)速系統(tǒng)。通過軟件編程,產(chǎn)生正弦脈沖寬度調(diào)制波形來控制絕緣柵雙極晶體管的導(dǎo)通和關(guān)斷,從而達到控制異步電動機轉(zhuǎn)速的目的。實驗結(jié)果表明,該系統(tǒng)可調(diào)頻率調(diào)電壓,穩(wěn)定度高,調(diào)速范圍寬,具有較強的實用價值   Abstract:   AC variable speed with digital control systems used microprocessors, power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology,this paper designed variable speed system which used 8098 as a controller, intelligent power module IPM as switching device. Through software programming, resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off, so as to achieve the purpose of speed control of induction motors. Experimental results show that the system can adjust frequency modulation voltage, high stability, wide speed range, has a strong practical value.  

    標(biāo)簽: 8098 SPWM 單片機 變頻調(diào)速系統(tǒng)

    上傳時間: 2013-11-14

    上傳用戶:ynwbosss

  • A digital fi‘equeney meter designed with FPGA development software Q-~us 11 is introduced.The 1 Hz—l

    A digital fi‘equeney meter designed with FPGA development software Q-~us 11 is introduced.The 1 Hz—l MHz input measured pulse signals of the digital ii‘equency meter can be used for measuring frequency,period,pulse width and duty ratio,etc.The test results stably display O71 3 seven—segment numeric tubes,and the measuring ranges may be switched over automatically.The measuring error is equal to or less than 0.1%.

    標(biāo)簽: development introduced designed software

    上傳時間: 2016-04-09

    上傳用戶:stewart·

  • The PWM_1 project is a simple program for the STM32F103RBT6 using Keil MCBSTM32 Evaluation Board a

    The PWM_1 project is a simple program for the STM32F103RBT6 using Keil MCBSTM32 Evaluation Board and demonstrating the use of PWM (Pulse Width Modulation) with Timer TIM4.

    標(biāo)簽: Evaluation project program MCBSTM

    上傳時間: 2013-12-25

    上傳用戶:familiarsmile

  • s3c2410提供了5個16位的Timer(Timer0~Timer4)

    s3c2410提供了5個16位的Timer(Timer0~Timer4),其中Timer0~Timer3支持Pulse Width Modulation—— PWM(脈寬調(diào)制 )。Timer4是一個內(nèi)部定時器(internal timer),

    標(biāo)簽: Timer s3c2410

    上傳時間: 2013-12-16

    上傳用戶:569342831

  • svpwm matlab

    空間矢量脈寬調(diào)制(Space Vector Pulse Width Modulation)    SVPWM的主要思想是:以三相對稱正弦波電壓供電時三相對稱電動機定子理想磁鏈圓為參考標(biāo)準(zhǔn),以三相逆變器不同開關(guān)模式作適當(dāng)?shù)那袚Q,從而形成PWM波,以所形成的實際磁鏈?zhǔn)噶縼碜粉櫰錅?zhǔn)確磁鏈圓。傳統(tǒng)的SPWM方法從電源的角度出發(fā),以生成一個可調(diào)頻調(diào)壓的正弦波電源,而SVPWM方法將逆變系統(tǒng)和異步電機看作一個整體來考慮,模型比較簡單,也便于微處理器的實時控制。    普通的三相全橋是由六個開關(guān)器件構(gòu)成的三個半橋。這六個開關(guān)器件組合起來(同一個橋臂的上下半橋的信號相反)共有8種安全的開關(guān)狀態(tài). 其中000、111(這里是表示三個上橋臂的開關(guān)狀態(tài))這兩種開關(guān)狀態(tài)在電機驅(qū)動中都不會產(chǎn)生有效的電流。因此稱其為零矢量。另外6種開關(guān)狀態(tài)分別是六個有效矢量。它們將360度的電壓空間分為60度一個扇區(qū),共六個扇區(qū),利用這六個基本有效矢量和兩個零量,可以合成360度內(nèi)的任何矢量。    當(dāng)要合成某一矢量時先將這一矢量分解到離它最近的兩個基本矢量,而后用這兩個基本矢量矢量去表示,而每個基本矢量的作用大小就利用作用時間長短去代表。    在變頻電機驅(qū)動時,矢量方向是連續(xù)變化的,因此我們需要不斷的計算矢量作用時間。為了計算機處理的方便,在合成時一般是定時去計算(如每0.1ms計算一次)。這樣我們只要算出在0.1ms內(nèi)兩個基本矢量作用的時間就可以了。由于計算出的兩個時間的總合可能并不是0.1ms(比這小),而那剩下的時間就按情況插入合適零矢量。 由于在這樣的處量時,合成的驅(qū)動波形和PWM很類似。因此我們還叫它PWM,又因這種PWM是基于電壓空間矢量去合成的,所以就叫它SVPWM了。 

    標(biāo)簽: matlab svpwm

    上傳時間: 2016-04-25

    上傳用戶:bijiaohao22

  • 基于TMS320F28035芯片為控制核心的空間矢量異步電機變頻器

    基于TMS320F28035芯片為控制核心的空間矢量異步電機變頻器  我們設(shè)計的異步電機變頻調(diào)速器以TMS320F28035芯片為控制核心,通過輸出三相PWM波控制智能功率模塊IPM驅(qū)動三相異步電機。我們使用空間矢量SVPWM算法,并對其進行了優(yōu)化。采用檢測反電勢的方法省去了昂貴的光電編碼器,大大節(jié)省了成本。同時開創(chuàng)性的研發(fā)了自動根據(jù)運行環(huán)境調(diào)節(jié)的自適應(yīng)變頻算法,使我們的變頻調(diào)速器可以在電網(wǎng)條件惡劣的鄉(xiāng)村山區(qū)工作,由此該變頻器已被一家民用水泵生產(chǎn)企業(yè)預(yù)訂。關(guān)鍵字 變頻器 TMS320f28035 IPM SVPWM In our design, the asynchronous machine inverter based on the chip of TMS320F28035 drives the three-Phase asynchronous machine by sending three-phase PWM waves to the IPM, which is short for the Intelligent-Power-Module. The SVPWM (space vector pulse width modulation) strategy is applied to our control algorithm and we optimize it mainly in two aspects. Firstly the inverter detects the speed by measuring the Back EMF instead of installing an expensive photoelectric encoder for costs reduction. 

    標(biāo)簽: tms320f28035 芯片

    上傳時間: 2022-05-08

    上傳用戶:zhanglei193

  • This demo shows the use of the PWM block in generating the pulse waveform whose duty cycle is changi

    This demo shows the use of the PWM block in generating the pulse waveform whose duty cycle is changing regularly. The PWM waveform period is variable, while the width of the pulse remains constant.

    標(biāo)簽: the generating waveform changi

    上傳時間: 2014-01-15

    上傳用戶:kr770906

  • This simple simulation of a pulse traveling down a parallel-plate guide makes a handy test code for

    This simple simulation of a pulse traveling down a parallel-plate guide makes a handy test code for initial experiments with boundary conditions. ToyFDTD3 adds some simple features to ToyFDTD1: A PMC boundary condition, a sinusoidal pulse source, and output tracking a single point in the mesh. Released 15 June 1999.

    標(biāo)簽: parallel-plate simulation traveling simple

    上傳時間: 2015-04-06

    上傳用戶:stella2015

  • Setting and Changing Column Widths By default, all columns in a table start out with equal width,

    Setting and Changing Column Widths By default, all columns in a table start out with equal width, and the columns automatically fill the entire width of the table. When the table becomes wider or narrower (which might happen when the user resizes the window containing the table), all the column widths change appropriately.

    標(biāo)簽: Changing Setting default columns

    上傳時間: 2015-05-04

    上傳用戶:璇珠官人

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