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phase-Shifted

  • DRM023_3-Phase AC Designer Reference Manual

    This reference design describes the design of a 3-phase AC induction vector control drive with position encoder coupled to the motor shaft. It is based on Motorola’s DSP56F805 dedicated motor control device. AC induction motors, which contain a cage, are very popular in variable speed drives. They are simple, rugged, inexpensive and available at all power ratings. Progress in the field of power electronics and microelectronics enables the application of induction motors for high-performance drives, where traditionally only DC motors were applied. Thanks to sophisticated control methods, AC induction drives offer the same control capabilities as high performance four-quadrant DC drives.

    標(biāo)簽: Reference Designer Manual Phase DRM 023 AC

    上傳時(shí)間: 2020-06-10

    上傳用戶:shancjb

  • 基于FPGA的OQPSK調(diào)制解調(diào)器設(shè)計(jì)與實(shí)現(xiàn).rar

    偏移正交相移鍵控(OQPSK:Offset Quadrature Phase Shift Keying)調(diào)制技術(shù)是一種恒包絡(luò)調(diào)制技術(shù),具有頻譜利用率高、頻譜特性好等特點(diǎn),廣泛應(yīng)用于衛(wèi)星通信和移動(dòng)通信領(lǐng)域。 論文以某型偵收設(shè)備中OQPSK解調(diào)器的全數(shù)字化為研究背景,設(shè)計(jì)并實(shí)現(xiàn)了基于FPGA的全數(shù)字OQPSK調(diào)制解調(diào)器,其中調(diào)制器主要用于仿真未知信號(hào),作為測(cè)試信號(hào)源。論文研究了全數(shù)字OQPSK調(diào)制解調(diào)的基本算法,包括成形濾波器、NCO模型、載波恢復(fù)、定時(shí)恢復(fù)等;完成了整個(gè)調(diào)制解調(diào)算法的MATLAB仿真。在此基礎(chǔ)上,采用VHDL硬件描述語(yǔ)言在Xilinx公司ISE7.1開(kāi)發(fā)環(huán)境下設(shè)計(jì)并實(shí)現(xiàn)了各個(gè)算法模塊,并在硬件平臺(tái)上加以實(shí)現(xiàn)。通過(guò)實(shí)際現(xiàn)場(chǎng)測(cè)試,實(shí)現(xiàn)了對(duì)所偵收信號(hào)的正確解調(diào)。論文還實(shí)現(xiàn)了解調(diào)器的百兆以太網(wǎng)接口,使得系統(tǒng)可以方便地將解調(diào)數(shù)據(jù)發(fā)送給計(jì)算機(jī)進(jìn)行后續(xù)處理。

    標(biāo)簽: OQPSK FPGA 調(diào)制

    上傳時(shí)間: 2013-06-30

    上傳用戶:Miyuki

  • MC145170在基本HF和VHF振蕩器中的應(yīng)用電路

    Phase–locked loop (PLL) frequency synthesizers are commonlyfound in communication gear today. Th

    標(biāo)簽: 145170 VHF MC 振蕩器

    上傳時(shí)間: 2013-04-24

    上傳用戶:yxgi5

  • 基于FPGA的OQPSK調(diào)制解調(diào)器

    偏移正交相移鍵控(OQPSK:Offset Quadrature Phase Shift Keying)調(diào)制技術(shù)是一種恒包絡(luò)調(diào)制技術(shù),具有頻譜利用率高、頻譜特性好等特點(diǎn),廣泛應(yīng)用于衛(wèi)星通信和移動(dòng)通信領(lǐng)域。 論文以某型偵收設(shè)備中OQPSK解調(diào)器的全數(shù)字化為研究背景,設(shè)計(jì)并實(shí)現(xiàn)了基于FPGA的全數(shù)字OQPSK調(diào)制解調(diào)器,其中調(diào)制器主要用于仿真未知信號(hào),作為測(cè)試信號(hào)源。論文研究了全數(shù)字OQPSK調(diào)制解調(diào)的基本算法,包括成形濾波器、NCO模型、載波恢復(fù)、定時(shí)恢復(fù)等;完成了整個(gè)調(diào)制解調(diào)算法的MATLAB仿真。在此基礎(chǔ)上,采用VHDL硬件描述語(yǔ)言在Xilinx公司ISE7.1開(kāi)發(fā)環(huán)境下設(shè)計(jì)并實(shí)現(xiàn)了各個(gè)算法模塊,并在硬件平臺(tái)上加以實(shí)現(xiàn)。通過(guò)實(shí)際現(xiàn)場(chǎng)測(cè)試,實(shí)現(xiàn)了對(duì)所偵收信號(hào)的正確解調(diào)。論文還實(shí)現(xiàn)了解調(diào)器的百兆以太網(wǎng)接口,使得系統(tǒng)可以方便地將解調(diào)數(shù)據(jù)發(fā)送給計(jì)算機(jī)進(jìn)行后續(xù)處理。

    標(biāo)簽: OQPSK FPGA 調(diào)制解調(diào)器

    上傳時(shí)間: 2013-05-19

    上傳用戶:zl123!@#

  • 干涉型光纖水聽(tīng)器信號(hào)解調(diào)方法研究

    光纖水聽(tīng)器自問(wèn)世以來(lái),在巨大的軍事價(jià)值和民用價(jià)值推動(dòng)下得到了迅速發(fā)展,已逐漸從實(shí)驗(yàn)室研究階段走向工程應(yīng)用。同時(shí)隨著光纖水聽(tīng)器的不斷發(fā)展,對(duì)水聲信號(hào)的檢測(cè)技術(shù)以及數(shù)字處理能力也提出了新的要求。論文在此背景下開(kāi)展了一系列研究工作,并提出了利用FPGA(Field ProgrammableGate Array,現(xiàn)場(chǎng)可編程門(mén)陣列)實(shí)現(xiàn)光纖3×3耦合器解調(diào)算法的新思路。 目前干涉型光纖水聽(tīng)器的解調(diào)一般采用PGC(Phase Generated Carrier,相位生成載波技術(shù))技術(shù)和基于3×3光纖耦合器干涉的解調(diào)技術(shù)。PGC技術(shù)在解調(diào)過(guò)程中引入了載波信號(hào),它對(duì)采樣率,激光器等的要求都較高,因此我們把目光投向3×3耦合器解調(diào)技術(shù),文中對(duì)其解調(diào)原理進(jìn)行了闡述,對(duì)采樣率的確定進(jìn)行了討論,并對(duì)3×3耦合器三路輸出不對(duì)稱的情況進(jìn)行了分析,最后在本文的結(jié)論部分提出了基于3×3耦合器解調(diào)的改良方案。 目前,光纖信號(hào)數(shù)字化解調(diào)的硬件實(shí)現(xiàn)采用DSP(Digital Signal Process,可編程數(shù)字信號(hào)處理器)信號(hào)處理機(jī),與之相比,F(xiàn)PGA解調(diào)具有速度快、資源占用少、易于擴(kuò)展等優(yōu)勢(shì)。本文對(duì)FPGA與DSP、ASIC(application-specificintegrated circuit,專用集成電路)實(shí)現(xiàn)方案進(jìn)行了對(duì)比,分析了適合利用FPGA實(shí)現(xiàn)的算法所應(yīng)具備的特征;介紹了3×3耦合器解調(diào)算法中各個(gè)模塊的設(shè)計(jì)情況;分析了系統(tǒng)的工作情況,硬件的構(gòu)造及芯片的選擇,最后驗(yàn)證了利用FPGA可以實(shí)現(xiàn)3×3耦合器解調(diào)算法。

    標(biāo)簽: 干涉型 光纖水聽(tīng)器 信號(hào)解調(diào) 方法研究

    上傳時(shí)間: 2013-07-03

    上傳用戶:love1314

  • LM621無(wú)刷電機(jī)換向器

    General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.

    標(biāo)簽: 621 LM 無(wú)刷電機(jī)

    上傳時(shí)間: 2013-07-24

    上傳用戶:sdq_123

  • 基于DSP的三相無(wú)刷直流電機(jī)調(diào)速系統(tǒng)的研究

    ·【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

  • 寄存器和環(huán)路濾波器的設(shè)計(jì)

    The MAX2870 ultra-wideband phase-locked loop (PLL) and voltagecontrol oscillator (VCO) can operate in both integer-N and fractional-Nmodes, similar to the Analog Devices ADF4350 wideband synthesizer.This application note compares the MAX2870 and ADF4350 registers andloop filter design in detail. Users who already familiar with ADF4350 canuse this application note as a quick design reference.

    標(biāo)簽: 寄存器 環(huán)路濾波器

    上傳時(shí)間: 2014-12-23

    上傳用戶:變形金剛

  • ISM射頻產(chǎn)品的晶體頻率計(jì)算

    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.  

    標(biāo)簽: ISM 射頻 晶體頻率 計(jì)算

    上傳時(shí)間: 2013-11-15

    上傳用戶:JasonC

  • XAPP854-數(shù)字鎖相環(huán)(DPLL)參考設(shè)計(jì)

    Many applications require a clock signal to be synchronous, phase-locked, or derived fromanother signal, such as a data signal or another clock. This type of clock circuit is important in

    標(biāo)簽: XAPP DPLL 854 數(shù)字鎖相環(huán)

    上傳時(shí)間: 2014-12-23

    上傳用戶:qq21508895

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