Once relegated to the hinterlands of low cost indicatorlights, the LED is again in the spotlight of the lightingworld. LED lighting is now ubiquitous, from car headlightsto USB-powered lava lamps. Car headlights exemplifyapplications that capitalize on the LED’s clear advantages—unwavering high quality light output, tough-assteelrobustness, inherent high effi ciency—while a USBlava lamp exemplifi es applications where only LEDs work.Despite these clear advantages, their requirement forregulated voltage and current Make LED driver circuitsmore complex than the venerable light bulb, but some newdevices are closing the gap. For instance, the LTM®8040μModule™ LED driver integrates all the driver circuitryinto a single package, allowing designers to refocus theirtime and effort on the details of lighting design criticalto a product’s success.
上傳時(shí)間： 2013-10-16
上傳用戶：togetsomething
Abstract: As electronic systems take over many of the mechanical functions in a car—ranging from engine timing to steering andbraking—there is a growing concern about fault tolerance. There should not be a single point of failure that would prevent a car fromat least "limping" off the road or making it to the nearest service station. Redundant systems, watchdog timers, and other controlcircuits are used to reroute signals and perform other functions that ensure that a vehicle can safely Make it off the road when afailure occurs.
標(biāo)簽： 看門狗定時(shí)器 汽車安全系統(tǒng)
上傳時(shí)間： 2013-11-10
上傳用戶：diets
為解決直流逆變交流的問題，有效地利用能源，讓電源輸出最大功率，設(shè)計(jì)了高性能的基于IR2101最大功率跟蹤逆變器，并以SPMC75F2413A單片機(jī)作為主控制器。高電壓、高速功率的MOSFET或IGBT驅(qū)動(dòng)器IR2101采用高度集成的電平轉(zhuǎn)換技術(shù)，同時(shí)上管采用外部自舉電容上電，能夠穩(wěn)定高效地驅(qū)動(dòng)MOS管。該逆變器可以實(shí)現(xiàn)DC/AC的轉(zhuǎn)換，最大功率點(diǎn)的跟蹤等功能。實(shí)際測試結(jié)果表明，該逆變器系統(tǒng)具有跟蹤能力強(qiáng)，穩(wěn)定性高，反應(yīng)靈敏等特點(diǎn)，該逆變器不僅可應(yīng)用于普通的電源逆變系統(tǒng)，而且可應(yīng)用于光伏并網(wǎng)發(fā)電的逆變系統(tǒng)，具有廣泛的市場前景。 Abstract: To solve the problem of DC-AC inverter， and to utilize solar energy more efficiently， the design of maximum power point tracking inverter based on IR2101 was achieved with a high-performance， which can Make the system output power maximum. SPMC75F2413A was adopted as main controller. IR2101 is a high voltage， high speed power MOSFET and IGBT driver. It adopted highly integrated voltage level transforming technology， and an external bootstrap capacitor was used， which could drive MOS tube efficiently and stably. Many functions are achieved in the system， such as DC/AC conversion， maximun power point tracking， etc. The actual test result shows that the inverter system has characteristics of strong tracking ability， high stability and reacting quickly. The design can not only be used in ordinary power inverter system， but also be used in photovoltaic power inverter system. The design has certain marketing prospects
上傳時(shí)間： 2013-11-17
上傳用戶：lliuhhui
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標(biāo)簽： 數(shù)字電源
上傳時(shí)間： 2013-10-16
上傳用戶：dddddd
利用單片機(jī)具有的智能程序控制的特點(diǎn)，設(shè)計(jì)了基于STC89C52單片機(jī)的"二極管特性測試器"，可對(duì)二極管一般特性進(jìn)行快速測試。通過穩(wěn)定線性電流源給二極管加載恒定電流，然后由高精度模數(shù)轉(zhuǎn)換器測試其壓降，以此為基礎(chǔ)可判斷二極管好壞、檢測二極管極性和測試二極管伏安特性等，避免了用萬用表測試只能測得極性而不知其特性這一缺點(diǎn)。可用于電子設(shè)計(jì)制作過程中對(duì)二極管進(jìn)行快速測試，以確定被測二極管是否滿足電路的設(shè)計(jì)要求。 Abstract: By making good use of the intelligent control function of the Micro Controller Unit (MCU)， the diode trait tester was designed based on the STC89C52，which could be used to test the trait of a diode rapidly. By loading constant current to diode through the stable linear current source， and measuring the voltage drop of the diode by high-precision analogue-to-digital converter (ADC)， it can judge whether the diode is good or not， distinguish the polarity of the diode， and test the trait that the diode， which can avoid the fault of using a multimeter can only measure the polarity but not the trait. This device can be used to test the trait of a diode quickly，and to Make sure that whether a diode can be used in the electronic design or not.
上傳時(shí)間： 2013-11-13
上傳用戶：assef
為了使音頻信號(hào)分析儀小巧可靠，成本低廉，設(shè)計(jì)了以2片MSP430F1611單片機(jī)為核心的系統(tǒng)。該系統(tǒng)將音頻信號(hào)送入八階巴特沃茲低通濾波器，對(duì)信號(hào)進(jìn)行限幅放大、衰減、電平位移、緩沖，并利用一單片機(jī)負(fù)責(zé)對(duì)前級(jí)處理后的模擬信號(hào)進(jìn)行采樣，將采集得到的音頻信號(hào)進(jìn)行4 096點(diǎn)基2的FFT計(jì)算，并對(duì)信號(hào)加窗函數(shù)提高分辨率，另一單片機(jī)負(fù)責(zé)對(duì)信號(hào)的分析及控制顯示設(shè)備。此設(shè)計(jì)精確的測量了音頻信號(hào)的功率譜、周期性、失真度指標(biāo)，達(dá)到較高的頻率分辨率，并能將測量結(jié)果通過紅外遙控器顯示在液晶屏上。 Abstract: o Make the audio signal analyzer cheaper， smaller and more reliable， this system sends the audio signal to the eight-order butterworth filter， and then amplifies， attenuates， buffers it in a limiting range， transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFT calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum， periodicity， power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.
上傳時(shí)間： 2013-12-11
上傳用戶：jasonheung
介紹一種多功能音樂播放器，它是以AT89S52單片機(jī)為核心，并輔有一些外圍器件，采用匯編語言編寫程序，實(shí)現(xiàn)多功能音樂播放，歌曲自動(dòng)循環(huán)播放和使用琴鍵自編曲目功能。此外，彩燈顯示歌曲節(jié)奏，按鍵跳轉(zhuǎn)到喜愛曲目，液晶顯示當(dāng)前播英文曲目。并給出了系統(tǒng)軟硬件設(shè)計(jì)。 Abstract: It introduces a multifunctional music player,taking AT89S52 single-chip microcomputer as hardware control core and using some peripheral elements.Programmes are compiled in assembly language to act as expected.There are two functional modes in this system.One is to Make the music play automatically and consecutively,the other is to compose new songs through keys.In addition,lights show the pace of music and the English names can be displayed in the liquid crystal screen.With perfect combination of hardware and software,the music player can meet many music lovers’needs for multifunctional music player.And the hardware and software of the system are given.
上傳時(shí)間： 2013-11-18
上傳用戶：xiaodu1124
偉福仿真器系統(tǒng)概述 本仿真器系統(tǒng)由仿真主機(jī)+仿真頭、MULT1A用戶板、實(shí)驗(yàn)板、開關(guān)電源等組成。本系統(tǒng)的特點(diǎn)是： 1．主機(jī)+仿真頭的組合，通過更換不同型號(hào)的仿真頭即可對(duì)各種不同類型的單片機(jī)進(jìn)行仿真，是一種靈活的多CPU仿真系統(tǒng)。采用主機(jī)+POD組合的方式，更換POD，可以對(duì)各種CPU進(jìn)行仿真。本仿真器主機(jī)型號(hào)為E2000/S，仿真頭型號(hào)為POD8X5X（可仿真51系列8X5X單片機(jī)）。 2．雙平臺(tái)，具有DOS版本和WINDOWS版本，后者功能強(qiáng)大，中/英文界面任選，用戶源程序的大小不再有任何限制，支持ASM，c，PLM語言混合編程，具有項(xiàng)目管理功能，為用戶的資源共享、課題重組提供強(qiáng)有力的手段。支持點(diǎn)屏顯示，用鼠標(biāo)左鍵點(diǎn)一下源程序中的某一變量，即可顯示該變量的數(shù)值。有豐富的窗口顯示方式，多方位，動(dòng)態(tài)地顯示仿真的各種過程，使用極為便利。本操作系統(tǒng)一經(jīng)推出，立即被廣大用戶所喜愛。 3．雙工作模式①.軟件模擬仿真(不要仿真器也能模擬仿真)。②硬件仿真。 4．雙CPU結(jié)構(gòu)，100％不占用戶資源。全空間硬件斷點(diǎn)，不受任何條件限制，支持地址、數(shù)據(jù)、外部信號(hào)、事件斷點(diǎn)、支持實(shí)時(shí)斷點(diǎn)計(jì)數(shù)、軟件運(yùn)行時(shí)間統(tǒng)計(jì)。 5．雙集成環(huán)境編輯、編譯、下載、調(diào)試全部集中在一個(gè)環(huán)境下。多種仿真器，多類CPU仿真全部集成在一個(gè)環(huán)境下。可仿真51系列，196系列，PIC系列，飛利蒲公司的552、LPC764、DALLAS320，華邦438等51增強(qiáng)型CPU。為了跟上形勢(shì)，現(xiàn)在很多工程師需要面對(duì)和掌握不同的項(xiàng)目管理器、編輯器、編譯器。他們由不同的廠家開發(fā)，相互不兼容，使用不同的界面，學(xué)習(xí)使用都很吃力。偉福WINDOWS調(diào)試軟件為您提供了一個(gè)全集成環(huán)境，統(tǒng)一的界面，包含一個(gè)項(xiàng)目管理器，一個(gè)功能強(qiáng)大的編輯器，匯編Make、Build和調(diào)試工具并提供千個(gè)與第三方編譯器的接口。由于風(fēng)格統(tǒng)一，大大節(jié)省了您的精力和時(shí)間。 6．強(qiáng)大的邏輯分析儀綜合調(diào)試功能。邏輯分析儀由交互式軟件菜單窗口對(duì)系統(tǒng)硬件的邏輯或時(shí)序進(jìn)行同步實(shí)時(shí)采樣，并實(shí)時(shí)在線調(diào)試分析，采集深度32K(E2000/L)，最高時(shí)基采樣頻率達(dá)20MHz，40路波形，可精確實(shí)時(shí)反映用戶程序運(yùn)行時(shí)的歷史時(shí)間。系統(tǒng)在使用邏輯分析儀時(shí)，除普通的單步運(yùn)行、鍵盤斷點(diǎn)運(yùn)行、全速硬件斷點(diǎn)運(yùn)行外，還可實(shí)現(xiàn)各種條件組合斷點(diǎn)如：數(shù)據(jù)、地址、外部控制信號(hào)、CPU內(nèi)部控制信號(hào)、程序區(qū)間斷點(diǎn)等。由于邏輯儀可以直接對(duì)程序的執(zhí)行結(jié)果進(jìn)行分析，因此極大地便利于程序的調(diào)試。隨著科學(xué)技術(shù)的發(fā)展，單片機(jī)通訊方面的運(yùn)用越來越多。在通訊功能的調(diào)試時(shí)，如果通訊不正常，查找原因是非常耗時(shí)和低效的，您很難搞清楚問題到底在什么地方，是波特率不對(duì)，是硬件信道有問題，是通訊協(xié)儀有問題，是發(fā)方出錯(cuò)還是收方出錯(cuò)。有了邏輯儀，情況則完全不一樣，用它可以分別或者同時(shí)對(duì)發(fā)送方、接收方的輸入或者輸出波形進(jìn)行記錄、存儲(chǔ)、對(duì)比、測量等各種直觀的分析，可以將實(shí)際輸出通訊報(bào)文的波形與源程序相比較，可立即發(fā)現(xiàn)問題所在，從而極大地方便了調(diào)試。 7．強(qiáng)大的追蹤器功能追蹤功能以總線周期為單位，實(shí)時(shí)記錄仿真過程中CPU發(fā)生的總線事件，其觸發(fā)條件方式同邏輯分析儀。追蹤窗口在仿真停止時(shí)可收集顯示追蹤的CPU指令記憶信息，可以以總線反匯編碼模式、源程序模式對(duì)應(yīng)顯示追蹤結(jié)果。屏幕窗口顯示波形圖最多追蹤記憶指令32K并通過仿真器的斷點(diǎn)、單步、全速運(yùn)行或各種條件組合斷點(diǎn)來完成追蹤功能。總線跟蹤可以跟蹤程序的運(yùn)行軌跡。可以統(tǒng)計(jì)軟件運(yùn)行時(shí)間。
標(biāo)簽： 單片機(jī)原理 接口技術(shù) 實(shí)驗(yàn)指導(dǎo)書
上傳時(shí)間： 2013-11-01
上傳用戶：xiehao13
為深入了解基于UC3854A控制的PFC變換器中的動(dòng)力學(xué)特性，研究系統(tǒng)參數(shù)變化對(duì)變換器中分岔現(xiàn)象的影響，在建立Boost PFC變換器雙閉環(huán)數(shù)學(xué)模型的基礎(chǔ)上，用Matlab軟件對(duì)變換器中慢時(shí)標(biāo)分岔及混沌等不穩(wěn)定現(xiàn)象進(jìn)行了仿真。在對(duì)PFC變換器中慢時(shí)標(biāo)分岔現(xiàn)象仿真的基礎(chǔ)上，分析了系統(tǒng)參數(shù)變化對(duì)分岔點(diǎn)的影響，并進(jìn)行了仿真驗(yàn)證。仿真結(jié)果清晰地顯示了輸入整流電壓的幅值變化對(duì)系統(tǒng)分岔點(diǎn)的影響。 Abstract: In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A， and Make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the Boost PFC （Power Factor Correction） converter controller was built. Then， with the help of Matlab， the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
上傳時(shí)間： 2013-10-17
上傳用戶：杜瑩12345
為解決輸油管道溫度壓力參數(shù)實(shí)時(shí)監(jiān)測的問題，設(shè)計(jì)了以C8051F930單片機(jī)作為控制核心的超低功耗輸油管道溫度壓力遠(yuǎn)程監(jiān)測系統(tǒng)。現(xiàn)場儀表使用高精度電橋采集數(shù)據(jù)，通過433 MHz短距離無線通信網(wǎng)絡(luò)與遠(yuǎn)程終端RTU進(jìn)行通信，RTU通過GPRS網(wǎng)絡(luò)與PC上位機(jī)進(jìn)行遠(yuǎn)程數(shù)據(jù)傳輸，在上位機(jī)中實(shí)現(xiàn)數(shù)據(jù)存儲(chǔ)和圖形化界面顯示，從而實(shí)現(xiàn)輸油管道溫度壓力參數(shù)的實(shí)時(shí)監(jiān)測和異常報(bào)警。經(jīng)實(shí)驗(yàn)證明，該系統(tǒng)的12位數(shù)據(jù)采集精度滿足設(shè)計(jì)要求，漏碼率小于1%，正常工作時(shí)間超過5個(gè)月，能實(shí)時(shí)有效地監(jiān)測輸油管道的溫度壓力參數(shù)，節(jié)省大量人工成本，有效預(yù)防管道參數(shù)異常造成的經(jīng)濟(jì)損失和環(huán)境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters， the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection， the 433MHz short-range wireless communication network was used to Make communication between field instrument and RTU， the GPRS was used by the RTU to transmit data to the PC host computer， and the data was stored and displayed in the PC host computer， so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time， it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
標(biāo)簽： C8051F930 溫度 壓力 遠(yuǎn)程監(jiān)測系統(tǒng)
上傳時(shí)間： 2013-11-07
上傳用戶：cuibaigao
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