·【英文題名】 Research of Speed Regulate System of Three Phase BLDCM Based on DSP 【作者中文名】 劉桂芬; 【導(dǎo)師】 孟慶春; 【學(xué)位授予單位】 遼寧工程技術(shù)大學(xué); 【學(xué)科專業(yè)名稱】 控制理論與控制工程 【學(xué)位年度】 2007 【論文級(jí)別】 碩士 【網(wǎng)絡(luò)出版投稿人】 遼寧工程技術(shù)大學(xué) 【網(wǎng)絡(luò)出版投稿時(shí)間】 2006-01-02 【
標(biāo)簽： DSP 三相 無(wú)刷直流電機(jī) 調(diào)速系統(tǒng)
上傳時(shí)間： 2013-06-19
上傳用戶：leileiq
摘要：本文主要介紹以CPLD 芯片進(jìn)行十字路口的交通燈的設(shè)計(jì)，用CPLD 作為交通燈控制器的主控芯片，采用VHDL\r\n語(yǔ)言編寫(xiě)控制程序，利用CPLD的可重復(fù)編程和在動(dòng)態(tài)系統(tǒng)重構(gòu)的特性，大大地提高了數(shù)字系統(tǒng)設(shè)計(jì)的靈活性和通用性。\r\n關(guān)鍵詞：CPLD；VHDL；交通燈控制器\r\n中圖分類號(hào)：TP39\r\nAbstract ：This paper introduces the electronic-traffic lamp, which is based on the VHDL and is com
上傳時(shí)間： 2013-08-11
上傳用戶：aesuser
用fpga實(shí)現(xiàn)的DA轉(zhuǎn)換器，有說(shuō)明和源碼，VDHL文件。\\r\\nA PLD Based Delta-Sigma DAC\\r\\nDelta-Sigma modulation is the simple, yet powerful,\\r\\ntechnique responsible for the extraordinary\\r\\nperformance and low cost of today s audio CD\\r\\nplayers. The simplest Delta-Sigm
標(biāo)簽： fpga DA轉(zhuǎn)換器
上傳時(shí)間： 2013-08-22
上傳用戶：dudu1210004
This document was developed under the Standard Hardware and Reliability Program (SHARP) TechnologyIndependent Representation of Electronic Products (TIREP) project. It is intended for use by VHSIC HardwareDescription Language (VHDL) design engineers and is offered as guidance for the development of VHDL modelswhich are compliant with the VHDL Data Item Description (DID DI-EGDS-80811) and which can be providedto manufacturing engineering personnel for the development of production data and the subsequent productionof hardware. Most VHDL modeling performed to date has been concentrated at either the component level orat the conceptual system level. The assembly and sub-assembly levels have been largely disregarded. Under theSHARP TIREP project, an attempt has been made to help close this gap. The TIREP models are based upon lowcomplexity Standard Electronic Modules (SEM) of the format A configuration. Although these modules are quitesimple, it is felt that the lessons learned offer guidance which can readily be applied to a wide range of assemblytypes and complexities.
標(biāo)簽： Modelling Guide Navy VHDL
上傳時(shí)間： 2014-12-23
上傳用戶：xinhaoshan2016
虛擬機(jī)自省（Virtual Machine Introspection，VMI）技術(shù)充分利用虛擬機(jī)管理器的較高權(quán)限，可以實(shí)現(xiàn)在單獨(dú)的虛擬機(jī)中部署安全工具對(duì)目標(biāo)虛擬機(jī)進(jìn)行監(jiān)測(cè)，為進(jìn)行各種安全研究工作提供了很好的解決途徑，從而隨著虛擬化技術(shù)的發(fā)展成為一種應(yīng)用趨勢(shì)。基于為更深入的理解和更好的應(yīng)用VMI技術(shù)提供參考作用的目的，本文對(duì)VMI技術(shù)進(jìn)行了分析研究。采用分析總結(jié)的方法，提出了VMI的概念，分析其實(shí)現(xiàn)原理和實(shí)現(xiàn)方式；詳細(xì)地分析總結(jié)了VMI技術(shù)在不同領(lǐng)域的研究進(jìn)展，通過(guò)對(duì)不同研究成果根據(jù)實(shí)現(xiàn)方式進(jìn)行交叉分析比較，得出不同研究成果對(duì)應(yīng)的4種實(shí)現(xiàn)方式；分析了VMI技術(shù)面臨的語(yǔ)義鴻溝問(wèn)題；最后對(duì)VMI技術(shù)研究進(jìn)行總結(jié)和展望。
上傳時(shí)間： 2014-08-21
上傳用戶：jkhjkh1982
微弱信號(hào)檢測(cè)裝置 四川理工學(xué)院 劉鵬飛、梁天德、曾學(xué)明 摘要： 本設(shè)計(jì)以TI的Launch Pad為核心板，采用鎖相放大技術(shù)設(shè)計(jì)并制作了一套微弱信號(hào)檢測(cè)裝置，用以檢測(cè)在強(qiáng)噪聲背景下已知頻率微弱正弦波信號(hào)的幅度值，并在液晶屏上數(shù)字顯示出所測(cè)信號(hào)相應(yīng)的幅度值。實(shí)驗(yàn)結(jié)果顯示其抗干擾能力強(qiáng)，測(cè)量精度高。 關(guān)鍵詞：強(qiáng)噪聲；微弱信號(hào)；鎖相放大；Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detection device, to measure the known frequency sine wave signal amplitude values of the weak in the high noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detection; lock-in-amplifier; Launch Pad 1、引言 隨著現(xiàn)代科學(xué)技術(shù)的發(fā)展，在科研與生產(chǎn)過(guò)程中人們?cè)絹?lái)越需要從復(fù)雜高強(qiáng)度的噪聲中檢測(cè)出有用的微弱信號(hào)，因此對(duì)微弱信號(hào)的檢測(cè)成為當(dāng)前科研的熱點(diǎn)。微弱信號(hào)并不意味著信號(hào)幅度小，而是指被噪聲淹沒(méi)的信號(hào)，“微弱”也僅是相對(duì)于噪聲而言的。只有在有效抑制噪聲的條件下有選擇的放大微弱信號(hào)的幅度，才能提取出有用信號(hào)。微弱信號(hào)檢測(cè)技術(shù)的應(yīng)用相當(dāng)廣泛，在生物醫(yī)學(xué)、光學(xué)、電學(xué)、材料科學(xué)等相關(guān)領(lǐng)域顯得愈發(fā)重要。 2、方案論證 針對(duì)微弱信號(hào)的檢測(cè)的方法有很多，比如濾波法、取樣積分器、鎖相放大器等。下面就針對(duì)這幾種方法做一簡(jiǎn)要說(shuō)明。 方案一：濾波法。 在大部分的檢測(cè)儀器中都要用到濾波方法對(duì)模擬信號(hào)進(jìn)行一定的處理，例如隔離直流分量，改善信號(hào)波形，防止離散化時(shí)的波形混疊，克服噪聲的不利影響，提高信噪比等。常用的噪聲濾波器有：帶通、帶阻、高通、低通等。但是濾波方法檢測(cè)信號(hào)不能用于信號(hào)頻譜與噪聲頻譜重疊的情況，有其局限性。雖然可以對(duì)濾波器的通頻帶進(jìn)行調(diào)節(jié)，但其噪聲抑制能力有限，同時(shí)其準(zhǔn)確性與穩(wěn)定性將大打折扣。
標(biāo)簽： 2012 TI 電子設(shè)計(jì)大賽 微弱信號(hào)
上傳時(shí)間： 2013-11-04
上傳用戶：lty6899826
Abstract: Many industrial/scientific/medical (ISM) band radio frequency (RF) products use crystal oscillators to generate areference for the phase-locked loop (PLL)-based local oscillator (LO). This tutorial provides a basic description of theISM-RF Crystal Calculator, which can be used to calculate various impacts on crystal frequency accuracy and startupmargin for such an LO.
上傳時(shí)間： 2013-11-15
上傳用戶：JasonC
Recently a new technology for high voltage Power MOSFETshas been introduced – the CoolMOS™ . Based on thenew device concept of charge compensation the RDS(on) areaproduct for e.g. 600V transistors has been reduced by afactor of 5. The devices show no bipolar current contributionlike the well known tail current observed during the turn-offphase of IGBTs. CoolMOS™ virtually combines the lowswitching losses of a MOSFET with the on-state losses of anIGBT.
標(biāo)簽： COOLMOS
上傳時(shí)間： 2013-11-14
上傳用戶：zhyiroy
This paper presents a space vector modulation(SVM)-based switching strategy for a three-level neutral point clamped (NPC) converter that is adapted as a STATCOM.
標(biāo)簽： STATCOM 三電平 變換器 空間矢量
上傳時(shí)間： 2013-10-20
上傳用戶：zyt
Who has never experienced oscillations issues when using an operational amplifier? Opampsare often used in a simple voltage follower configuration. However, this is not the bestconfiguration in terms of capacitive loading and potential risk of oscillations.Capacitive loads have a big impact on the stability of operational amplifier-basedapplications. Several compensation methods exist to stabilize a standard op-amp. Thisapplication note describes the most common ones, which can be used in most cases.The general theory of each compensation method is explained, and based on this, specific
標(biāo)簽： 半導(dǎo)體 運(yùn)放 穩(wěn)定性
上傳時(shí)間： 2013-10-28
上傳用戶：chenbhdt
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