對大學物理實驗中放電法測高阻的傳統實驗,采用單片機-計算機接口技術和模數變換技術,用計算機對數據進行處理得出結果。它既可以作為自動化測量設備,也可以作為高年級大學生課程設計或畢業設計題目,對于拓寬大學生知識面,提高實際動手能力和解決問題能力有一定的價值。
上傳時間: 2013-11-03
上傳用戶:jichenxi0730
單片機控制的永磁無刷直流電動機調速系統適用于電動自行車等小功率的工作情況。并能將多余的電能回潰。該系統具有調速性能好、功率因數高、節能、體積小、重量輕等優點。
上傳時間: 2013-10-30
上傳用戶:yqs138168
詳細介紹了阿爾卡特朗訊1850業務傳輸平臺TSS-5通用單板控制器的功能以及MSP430單片機在PTN產品中的應用。TSS-5系統選取MSP430單片機作為它的通用單板控制器,單板控制器主要用于監測外部電壓、電流、探測槽位號、控制面板LED燈、下載FPGA固件、控制外部電壓,監測單板鎖存器狀態以及主板的通訊。最后研發結果表明MSP430在TSS-5中得以成功應用,為TSS-5產品帶來了很多優勢,如高可靠性,低功率消耗,靈活的控制架構,低廉的成本,易于維護與升級。
上傳時間: 2013-11-10
上傳用戶:GHF
GPS高精度的時鐘的設計和實現
上傳時間: 2013-11-25
上傳用戶:caiqinlin
數字控制的交流調速系統所選用的微處理器、功率器件及產生PWM波的方法是影響交流調速系統性能好壞的直接因素。在介紹了正弦脈寬調制(SPWM)技術的基礎上,設計了一種以8098單片機作為控制器,以智能功率模塊IPM為開關器件的變頻調速系統。通過軟件編程,產生正弦脈沖寬度調制波形來控制絕緣柵雙極晶體管的導通和關斷,從而達到控制異步電動機轉速的目的。實驗結果表明,該系統可調頻率調電壓,穩定度高,調速范圍寬,具有較強的實用價值 Abstract: AC variable speed with digital control systems used microprocessors, power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology,this paper designed variable speed system which used 8098 as a controller, intelligent power module IPM as switching device. Through software programming, resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off, so as to achieve the purpose of speed control of induction motors. Experimental results show that the system can adjust frequency modulation voltage, high stability, wide speed range, has a strong practical value.
上傳時間: 2013-11-14
上傳用戶:ynwbosss
為了使音頻信號分析儀小巧可靠,成本低廉,設計了以2片MSP430F1611單片機為核心的系統。該系統將音頻信號送入八階巴特沃茲低通濾波器,對信號進行限幅放大、衰減、電平位移、緩沖,并利用一單片機負責對前級處理后的模擬信號進行采樣,將采集得到的音頻信號進行4 096點基2的FFT計算,并對信號加窗函數提高分辨率,另一單片機負責對信號的分析及控制顯示設備。此設計精確的測量了音頻信號的功率譜、周期性、失真度指標,達到較高的頻率分辨率,并能將測量結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.
上傳時間: 2013-12-11
上傳用戶:jasonheung
DSP的使用正呈爆炸式發展。OFDM、GPS相關器、FFT、FIR濾波器或H.264之類計算密集型算法在從移動電話到汽車的各種應用中都很常見。設計人員實現DSP有三種選擇:他們可以使用DSP處理器、FPGA或掩膜ASIC。ASIC具有最高的吞吐量、最低的功耗和最低的成本,但其極大的NRE和較長研制周期使其對許多設計而言并不適用。定制ASIC的研制周期可達一年之久,比最終產品的使用壽命都長。FPGA已占居較大的市場份額,因為其能提供比DSP處理器更好的吞吐量,而且沒有ASIC的極大NRE和較長研制周期。 因此,常常將基于ARM的MCU和FPGA結合使用來實現這些設計,其中FPGA實現設計的DSP部分。然而,FPGA也有其自身的不足--最突出的是功耗很高(靜態功耗接近2W),且性能比ASIC慢。FPGA時鐘用于邏輯執行時通常限制為50MHz,而ASIC可以400MHz或更高頻率執行邏輯。其他缺點還包括在IP載入基于SRAM的FPGA時安全性還不夠理想,成本也較高。盡管FPGA成本已迅速降低,但價格通常在10,000片左右就不再下降,因此仍比較昂貴。 新型可定制Atmel處理器(CAP)MCU具有的門密度、單元成本、性能和功耗接近基于單元的ASIC,而NRE較低且開發時間較快。與基于ARM的非可定制標準產品MCU一樣,不需要單獨的ARM許可。 可定制MCU利用新型金屬可編程單元結構(MPCF)ASIC技術,其門密度介于170K門/mm2與210K門/mm2之間,與基于單元的ASIC相當。例如,實現D觸發器(DFF)的MPCF單元與標準的單元DFF都使用130nm的工藝,所用面積差不多相同。
上傳時間: 2013-10-29
上傳用戶:xymbian
為了有效地提升鉛酸蓄電池的使用壽命,同時實現對充電過程的監控,設計出一種用單片機控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓撲,連續電流工作模式,電源管理IC設計在電源的副邊,由ELAN公司的EM78P258N單片機模擬,是用可編程器件模擬電源管理IC,實現智能電源低成本化的一次成功嘗試,通過對單片機的軟件設計實現了充電電源的狀態顯示、充電時間控制、報警、過溫保護、過壓保護、過流保護等功能。本充電器真正的實現了鉛酸蓄電池的三段式充電過程,其最高輸出功率可達90 W,效率約85%,成本不到20元,具有很高的市場競爭力。 Abstract: In order to extend the life of lead-acid battery efficiently and supervise the charging process meanwhile, a 36V lead-acid battery charge powe supply controlled by microcontroller is designed. The charger is flyback switching power supply and works in CCM mode. A EM78P258N microcontroller made by ELAN microelectronics corporation is used as power management IC which is designed at the secondary circuit. The project is a successful attempt to low-cost intelligent power used microcontroller simulating power management IC. The charger also has the functions of the status reveal, charge time control, alarming, thermal protect, current limit and overvoltage protect by the software design. The circuit actually implements the three-step charge process, whose power is up to 90W and whose efficiency can get 85%. The net cost of this charger is less than 20 RMB, so that the charger is of powerful market competitiveness.
上傳時間: 2013-11-16
上傳用戶:cepsypeng
生活中許多目標的高度和水平距離需要進行測量。目前主要的測量方法,仍以傳統的皮尺丈量為主,測量效率不高,有時還很不方便,沒有技術成熟的數字式測高測距產品。以基本的數學方法為理論依據,利用遙控小車做為載體,采用角度傳感器測量角度、霍爾傳感器測量水平距離等,通過單片機LM3S615進行數據計算,實現了對待測目標物體的高度、水平距離等數據的快速、精確和數字式的測量,高度測量精度可達99.06%,水平測量精度則可達98.06%。 Abstract: In our lives, the height and horizontal distance of some goals are needed to be measured. Because the currently used methods are still traditional tape-based measuring methods, and the measuring efficiency is low and inconvenient so some kinds of digital and portable measuring methods or instruments are needed. Based on the basic math theory, this paper designed and manufactured a portable, digital and remote controlled measuring mobile small vehicle, which assembled with angle measuring sensor for angle measurement and Hall sensor for horizontal distance measuring. MCU LM3S615 calculated the height and horizontal distance data gotten from these sensors. The measuring process is simple, the measuring results are more accurate and the measuring efficiency is higher than traditional measure instruments. The accuracy of height and distance measurement can reach 99.06% and 98.06%.
上傳時間: 2013-10-30
上傳用戶:jackandlee
MG3500SoC是支持H.264高清編解碼器的片上系統,內部集成一個嵌入式ARM926處理器,支持高清H.264編解碼、MPEG鄄2解碼和JPEG編解碼。介紹了MG3500SoC的主要性能特點、引腳排列、主要接口功能及在DVR上的應用,以及MG3500SoC及其周圍器件的硬件設計,提出了在設計中應注意的問題。 Abstract: The MG3500System-on-Chip(SoC)is high definition(HD)H.264codec,including ARM926-EJ processor,H.264encoder/decoder,MPEG2decoder and JPEG/MJPEG encoder/decoder.The features,pin assignments,interfaces and the typical application of MG3500in DVR are introduced in this paper.The application hardware circuit between the MG3500SoC and peripheral device are given,the questions which the syetem design needs to pay attention are explained.
上傳時間: 2013-11-12
上傳用戶:elinuxzj