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本應(yīng)用筆記介紹一種采用dsPIC數(shù)字信號(hào)控制器（Digital Signal Controller，DSC）或PIC24單片機(jī)來(lái)實(shí)現(xiàn)無(wú)刷直流（Brushless Direct Current，BLDC）電機(jī)無(wú)傳感器控制的算法。該算法利用對(duì)反電動(dòng)勢(shì)（Back-Electromotive Force，BEMF）進(jìn)行數(shù)字濾波的擇多函數(shù)來(lái)實(shí)現(xiàn)。通過(guò)對(duì)電機(jī)的每一相進(jìn)行濾波來(lái)確定電機(jī)驅(qū)動(dòng)電壓換相的時(shí)刻。這一控制技術(shù)省卻了分立的低通濾波硬件和片外比較器。需指出，這里論述的所有內(nèi)容及應(yīng)用軟件，都是假定使用三相電機(jī)。該電機(jī)控制算法包括四個(gè)主要部分：·利用DSC或單片機(jī)的模數(shù)轉(zhuǎn)換器（Analog-to-digital Converter，ADC）來(lái)采樣梯形波BEMF信號(hào)·PWM導(dǎo)通側(cè)ADC采樣，以降低噪聲并解決低電感問(wèn)題·將梯形波BEMF信號(hào)與VBUS/2進(jìn)行比較，以檢測(cè)過(guò)零點(diǎn)·用擇多函數(shù)濾波器對(duì)比較結(jié)果信號(hào)進(jìn)行濾波·以三種不同模式對(duì)電機(jī)驅(qū)動(dòng)電壓進(jìn)行換相：-傳統(tǒng)開(kāi)環(huán)控制器·傳統(tǒng)閉環(huán)控制器比例-積分（Proportional-Integral，Pl）閉環(huán)控制器
標(biāo)簽：
BLDC
上傳時(shí)間：
2022-07-01
上傳用戶：
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本壓縮包上傳的源程序使用C語(yǔ)言編寫(xiě)，可以進(jìn)行二次開(kāi)發(fā)，可移植性強(qiáng)！ADC（analog to digital converter）即模數(shù)轉(zhuǎn)換器，它可以將模擬信號(hào)轉(zhuǎn)換為數(shù)字信號(hào)。按照其轉(zhuǎn)換原理主要分為逐次逼近型、雙積分型、電壓頻率轉(zhuǎn)換型三種。STM32F1 的 ADC 就是逐次逼近型的模擬數(shù)字轉(zhuǎn)換器。STM32F103 系列一般都有 3 個(gè) ADC，這些 ADC 可以獨(dú)立使用，也可以使用雙重/三重模式（提高采樣率）。STM32F1 的 ADC 是 12 位逐次逼近型的模擬數(shù)字轉(zhuǎn)換器。它具有多達(dá) 18 個(gè)復(fù)用通道，可測(cè)量來(lái)自 16 個(gè)外部源、2 個(gè)內(nèi)部信號(hào)源。 這些通道的 A/D 轉(zhuǎn)換可以單次、連續(xù)、掃描或間斷模式執(zhí)行。ADC 的結(jié)果可以左對(duì)齊或右對(duì)齊方式存儲(chǔ)在 16 位數(shù)據(jù)寄存器中。ADC 具有模擬看門(mén)狗特性，允許應(yīng)用程序檢測(cè)輸入電壓是否超出用戶定義的閥值上限或者下限。
標(biāo)簽：
stm32
adc轉(zhuǎn)換
源程序
上傳時(shí)間：
2022-07-25
上傳用戶：zhanglei193
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Java Clock is a FREE Java applet used to display a clock on your Web pages. You can display either analog or digital clock. The full source code of this applet is also available (visit my home page to download it). You may use this applet on your Web pages WITHOUT paying me fee or royalty as long as credit is given (a link to my home page is enough).
標(biāo)簽：
display
Java
applet
either
上傳時(shí)間：
2014-01-12
上傳用戶：woshiayin
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A few short years ago, the applications for
video were somewhat confined—analog was
used for broadcast and cable television, VCRs,
set-top boxes, televisions and camcorders.
Since then, there has been a tremendous and
rapid conversion to digital video, mostly based
on the MPEG-2 video compression standard.
Today, in addition to the legacy DV,
MPEG-1 and MPEG-2 audio and video com-
pression standards, there are three new high-
performance video compression standards.
These new video codecs offer much higher
video compression for a given level of video
quality.
標(biāo)簽：
applications
for
confined
somewhat
上傳時(shí)間：
2016-10-29
上傳用戶：bjgaofei
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A large body of computer-aided techniques has been developed in recent years to assist
in the process of modeling, analyzing, and designing communication systems . These
computer-aided techniques fall into two categories: formula-based approaches, where the
computer is used to evaluate complex formulas, and simulation-based approaches, where the
computer is used to simulate the waveforms or signals that flow through the system. The
second approach, which involves “waveform”-level simulation (and often incorporates
analytical techniques), is the subject of this book.
Since performance evaluation and trade off studies are the central issues in the analysis
and design of communication systems, we will focus on the use of simulation for evaluating
the performance of analog and digital communication systems with the emphasis on digitalcommunication systems.
標(biāo)簽：
computer-aided
techniques
developed
assist
上傳時(shí)間：
2014-01-01
上傳用戶：541657925
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Main program running when workpiece is ready on deferent belt(deferent_ready=ture).
* Call Square_Wave subroutine to generate 0.5ms square wave on P1.2 to drive
* electromotor,then drive deferent belt step forward. When it steps to the measure
* zone, it stops to be measured. Then call A_D subroutine to transform analog
* signals to digital signals , after then call serial subroutine to transfer
* digital signals to PC. Call square wave subroutine to drive deferent belt step to
* original position waitting for defere ready flag to run the next circle.
標(biāo)簽：
deferent_ready
workpiece
deferent
program
上傳時(shí)間：
2017-08-31
上傳用戶：baiom
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The bookl tell the analog Analog and Digital Communications and Analog and Digital Communications
Laboratory
標(biāo)簽：
Communication
Digital
Systems
上傳時(shí)間：
2020-05-27
上傳用戶：shancjb
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In Helsinki during a visiting lecture, an internationally well-known professor in communica-
tionssaid,‘Inthecommunicationssocietywehavemanagedtoconvertourproposalsandideas
to real products, not like in the control engineering society. They have very nice papers and
strong mathematics but most of the real systems still use the old PID controllers!’. As our
background is mainly in control as well as communications engineering, we know that this
thought is not very accurate. We agree that most of the practical controllers are analog and
digital PID controllers, simply because they are very reliable and able to achieve the required
control goals successfully. Most of the controllers can be explained in terms of PID. The
reasons behind this impressive performance of PID will be explained in Chapter 2.
標(biāo)簽：
Communications
Engineering
Wireless
Systems
in
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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This edition of Digital Image Processing is a major revision of the book. As in
the 1977 and 1987 editions by Gonzalez and Wintz, and the 1992, 2002, and 2008
editions by Gonzalez and Woods, this sixth-generation edition was prepared
with students and instructors in mind. The principal objectives of the book
continue to be to provide an introduction to basic concepts and methodologies
applicable to digital image processing, and to develop a foundation that can
be used as the basis for further study and research in this field. To achieve
these objectives, we focused again on material that we believe is fundamental
and whose scope of application is not limited to the solution of specialized
problems. The mathematical complexity of the book remains at a level well
within the grasp of college seniors and first-year graduate students who have
introductory preparation in mathematical analysis, vectors, matrices, probability,
statistics, linear systems, and computer programming. The book website provides
tutorials to support readers needing a review of this background material
標(biāo)簽：
Processing
Digital
Image
上傳時(shí)間：
2021-02-20
上傳用戶：
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This texts contemporary approach focuses on the concepts of linear control systems, rather than computational mechanics. Straightforward coverage includes an integrated treatment of both classical and modern control system methods. The text emphasizes design with discussions of problem formulation, design criteria, physical constraints, several design methods, and implementation of compensators.Discussions of topics not found in other texts--such as pole placement, model matching and robust tracking--add to the texts cutting-edge presentation. Students will appreciate the applications and discussions of practical aspects, including the leading problem in developing block diagrams, noise, disturbances, and plant perturbations. State feedback and state estimators are designed using state variable equations and transfer functions, offering a comparison of the two approaches. The incorporation of MATLAB throughout the text helps students to avoid time-consuming computation and concentrate on control system design and analysis
標(biāo)簽：
控制系統(tǒng)
上傳時(shí)間：
2021-12-15
上傳用戶：
