基于對(duì)處于偏遠(yuǎn)地區(qū)的光伏發(fā)電基站電源運(yùn)行情況進(jìn)行遠(yuǎn)程控制和檢測的目的，本系統(tǒng)設(shè)計(jì)了具有針對(duì)性的監(jiān)測系統(tǒng)，基站電源發(fā)電的電壓、電流值每5 s鐘采集一次，通過GPRS模塊無線高速傳輸?shù)娇傉居?jì)算機(jī)進(jìn)行檢測和控制。進(jìn)行串口通信實(shí)時(shí)數(shù)據(jù)采集、存儲(chǔ)、查詢，并完成對(duì)上位機(jī)串行口接收數(shù)據(jù)設(shè)置、上位機(jī)對(duì)下位機(jī)工作情況的檢測和系統(tǒng)功能的設(shè)定。探討了GPRS模塊進(jìn)行數(shù)據(jù)傳輸?shù)倪^程，MC35i驅(qū)動(dòng)及AT指令的編寫和數(shù)據(jù)傳輸協(xié)議的制定。在大量的實(shí)驗(yàn)的基礎(chǔ)上，采集到日光強(qiáng)度改變時(shí)基站電源運(yùn)行情況的數(shù)據(jù)，為提高太陽能電池的利用率提供了實(shí)踐依據(jù)。
標(biāo)簽： 光伏發(fā)電 通信基站 電源 遠(yuǎn)程監(jiān)測系統(tǒng)
上傳時(shí)間： 2013-11-06
上傳用戶：破曉sunshine
該對(duì)講機(jī)模塊是一款性價(jià)比極高的全集成對(duì)講機(jī)Module，內(nèi)置高性能射頻收發(fā)芯片、微控制器以及射頻功放(PA)。外部控制器通過標(biāo)準(zhǔn)的異步串行接口（RS232）設(shè)置模塊的參數(shù)、功能，并可通過串口AT指令控制整個(gè)模塊的收發(fā)。 該模塊體積小、集成度高、性能穩(wěn)定、應(yīng)用靈活，且符合世界大多數(shù)國家對(duì)講機(jī)標(biāo)準(zhǔn)，很容易通過CE/FCC等認(rèn)證；采用此模塊可做成小型對(duì)講機(jī)，也可將模塊嵌入到其它手持終端設(shè)備以實(shí)現(xiàn)無線對(duì)講功能。
標(biāo)簽： 對(duì)講機(jī) 模塊 方案
上傳時(shí)間： 2013-11-25
上傳用戶：caoyuanyuan1818
GPRS模塊的AT指令集
上傳時(shí)間： 2013-11-16
上傳用戶：wincoder
針對(duì)飛行模擬器座艙數(shù)據(jù)采集的復(fù)雜性，設(shè)計(jì)了一種基于以太網(wǎng)分布式的數(shù)據(jù)采集控制系統(tǒng)，該系統(tǒng)是RCM5700微處理器模塊上的以太網(wǎng)應(yīng)用。在系統(tǒng)的基礎(chǔ)上具體討論了PoE技術(shù)的應(yīng)用，在傳輸數(shù)據(jù)的網(wǎng)線上同時(shí)提供電流，提出并實(shí)現(xiàn)了一種包括輔助電源在內(nèi)的完整可靠的PoE供電方案。設(shè)計(jì)采用美國國家半導(dǎo)體的LM5073和LM5576并根據(jù)不同的負(fù)載情況，進(jìn)行穩(wěn)定可靠的電壓轉(zhuǎn)換，以滿足數(shù)據(jù)采集電路的要求。實(shí)驗(yàn)結(jié)果表明：該設(shè)計(jì)穩(wěn)定可靠，滿足低于13 W的采集節(jié)點(diǎn)供電要求，提高了模擬器信號(hào)采集系統(tǒng)的通用性和標(biāo)準(zhǔn)化程度，避免了以往數(shù)據(jù)采集節(jié)點(diǎn)單獨(dú)繁瑣的電源設(shè)計(jì)。 Abstract: Aiming at the complexity of large avion simulation and controlling，the simulator cabin distribute data collecting and control system was designed. This system is the application of RCM5700 on Ethernet. Based on this system，PoE technique that makes Ethernet can also provide power were expounded with emphasis and included FAUX design the PoE resolution was realized. To achieve the requirement of this system，LM5073 and LM5576 were used to DC-DC switch. From the data of experiment，the design filled the requirement of power-need of node whose power was lower than 13W. The application of the technique can advance the degree of simulation data collections currency and standardization and avoid designing additional power system.
標(biāo)簽： 以太網(wǎng) 分布式 數(shù)據(jù)采集 控制系統(tǒng)
上傳時(shí)間： 2013-11-09
上傳用戶：xyipie
在現(xiàn)代通信系統(tǒng)中，電話語音的頻帶被限制在300 Hz～4 kHz的范圍內(nèi)，帶來了語音可懂度和自然度的降低。為了在不增加額外成本的前提下提高語音的可懂度和自然度，進(jìn)行了電話語音頻帶擴(kuò)展的研究。提出了一種改進(jìn)的基于碼本映射的語音帶寬擴(kuò)展算法：在碼本映射的過程中，使用加權(quán)系數(shù)來得到映射碼本。客觀測試結(jié)果表明，用此算法得到的寬帶語音的譜失真度比用一般的碼本映射降低至少2%。主觀測試結(jié)果表明，用此算法得到的寬帶語音具有更好的可懂度和自然度。 Abstract: In modern communication systems， the bandwidth of telephone speech is limited from 300Hz to 4 kHz， which reduces the intelligibility and naturalness of speech. Telephone speech bandwidth extension is researched to get wideband speech and to improve its intelligibility and naturalness， without increasing extra costs. This paper put forward an improved algorithm of speech bandwidth extension based on codebook mapping. In the process of codebook mapping， weighted coefficients were used to get mapping codebook. Objective tests show that spectral distortion of wideband speech obtained by this algorithm reduces at least 2%， comparing to conditional codebook mapping. Subjective tests show that the wideband speech obtained by this algorithm has better intelligibility and naturalness.
上傳時(shí)間： 2014-12-29
上傳用戶：15501536189
The field of microelectromechanical systems (MEMS), particularly micromachinedmechanical transducers, has been expanding over recent years, and the productioncosts of these devices continue to fall. Using materials, fabrication processes, anddesign tools originally developed for the microelectronic circuits industry, newtypes of microengineered device are evolving all the time—many offering numerousadvantages over their traditional counterparts. The electrical properties of siliconhave been well understood for many years, but it is the mechanical properties thathave been exploited in many examples of MEMS. This book may seem slightlyunusual in that it has four editors. However, since we all work together in this fieldwithin the School of Electronics and Computer Science at the University of Southampton,it seemed natural to work together on a project like this. MEMS are nowappearing as part of the syllabus for both undergraduate and postgraduate coursesat many universities, and we hope that this book will complement the teaching thatis taking place in this area.
上傳時(shí)間： 2013-10-16
上傳用戶：朗朗乾坤
特點(diǎn) 精確度0.1%滿刻度 ±1位數(shù) 顯示范圍-19999-99999可任意規(guī)劃 可直接量測直流電流/直流電壓,無需另接輔助電源 尺寸小(24x48x50mm),穩(wěn)定性高 分離式端子,配線容易 CE 認(rèn)證 2.主要規(guī)格 輔助電源: None 精確度: 0.1% F.S. ±1 digit(1-100%F.S.) 輸入抗阻 : >100Mohm(<2V range) >2Mohm(<2Vrange) < 0.25VA(current ranges) < 1000Vrms(>54V ranges) 最大過載能力: < 150Vrms(<54V ranges)
上傳時(shí)間： 2013-10-08
上傳用戶：tiantwo
多遠(yuǎn)程二極管溫度傳感器-Design Considerations for pc thermal management Multiple RDTS (remote diode temperature sensing) provides the most accurate method of sensing an IC’s junction temperature. It overcomes thermal gradient and placement issues encountered when trying to place external sensors. PCB component count decreases when using a device that provides multiple inputs.Better temperature sensing improves product performance and reliability. Disk drive data integrity suffers at elevated temperatures. IBM published an article stating that a 5°C rise in operating temperature causes a 15% increase in the drive’s failure rate. The overall performance of a system can be improved by providing a more accurate temperature measurement of the most critical devices allowing them to run just a few degrees hotter.The LM83 directly senses its own temperature and the temperature of three external PN junctions. One is dedicated to the CPU of choice, the other two go to other parts of your system that need thermal monitoring such as the disk drive or graphics chip. The SMBus-compatible LM83 supports SMBus timeout and logic levels. The LM83 has two interrupt outputs; one for user-programmable limits and WATCHDOG capability (INT), the other is a Critical Temperature Alarm output (T_CRIT_A) for system power supply shutdown.
標(biāo)簽： Considerat Design 遠(yuǎn)程 二極管
上傳時(shí)間： 2014-12-21
上傳用戶：ljd123456
AWG=American Wire Gauge standard：Gauge Diam Area R I at 3A/mm2 AWGmm mm2 ohm/km mA
上傳時(shí)間： 2013-11-08
上傳用戶：yangqian
AT+I指令集
標(biāo)簽： ConnectOne Fall 00
上傳時(shí)間： 2013-11-12
上傳用戶：Thuan
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