當(dāng)今電子系統(tǒng)如高端處理器及記憶體，對(duì)電源的需求是趨向更低電壓、更高電流的應(yīng)用。同時(shí)、對(duì)負(fù)載的反應(yīng)速度也要提高。因此功率系統(tǒng)工程師要面對(duì)的挑戰(zhàn)，是要設(shè)計(jì)出符合系統(tǒng)要求的細(xì)小、價(jià)廉但高效率的電源系統(tǒng)。而這些要求都不是傳統(tǒng)功率架構(gòu)能夠完全滿足的。Vicor提出的分比功率架構(gòu)(Factorized Power Architecture FPA)以及一系列的整合功率元件，可提供革命性的功率轉(zhuǎn)換方案，應(yīng)付以上提及的各項(xiàng)挑戰(zhàn)。這些功率元件稱為V•I晶片。
上傳時(shí)間： 2013-11-15
上傳用戶：yan2267246
The P89LPC912/913/914 are single-chip microcontrollers in low-cost 14-pin packages, based on a high performance processor architecture that executes instructions in two to four clocks, six times the rate of standard 80C51 devices. Many system level functions have been incorporated into the P89LPC912/913/914 in order to reduce component count, board space, and system cost.
上傳時(shí)間： 2013-10-12
上傳用戶：司令部正軍級(jí)
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
標(biāo)簽： C8051F020
上傳時(shí)間： 2013-10-12
上傳用戶：lalalal
針對(duì)科研實(shí)驗(yàn)中對(duì)拉壓千斤頂加載過程控制的需要，采用ATmega128單片機(jī)控制步進(jìn)電機(jī)進(jìn)而實(shí)現(xiàn)對(duì)執(zhí)行系統(tǒng)的電動(dòng)泵站實(shí)行自動(dòng)控制。對(duì)力和位移的數(shù)據(jù)采集與處理及用步進(jìn)電機(jī)控制電動(dòng)泵站手柄的技術(shù)細(xì)節(jié)作了重點(diǎn)描述。通過單片機(jī)的A/D變換器對(duì)AMP放大模塊采集的電橋信號(hào)作量化處理，千斤頂?shù)牟倏厥直恢靡离妱?dòng)油泵閥門開啟的方向和大小作若干定位，單片機(jī)根據(jù)力或位移傳感器信號(hào)，實(shí)時(shí)控制步進(jìn)電機(jī)驅(qū)動(dòng)手柄旋轉(zhuǎn)到相應(yīng)操控位置。 Abstract: This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing， and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge， jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals， real-time control stepper motor drive control handle rotate to the appropriate location.
標(biāo)簽： AVR 單片機(jī) 閉環(huán)控制
上傳時(shí)間： 2014-01-16
上傳用戶：hasan2015
為解決電致變色器件的顏色變化受外界環(huán)境顏色控制的問題，設(shè)計(jì)了一種基于單片機(jī)的便攜式顏色自適應(yīng)識(shí)別電路。與傳統(tǒng)顏色識(shí)別電路相比較，該電路利用數(shù)字式的顏色傳感器來(lái)獲取外界環(huán)境顏色，產(chǎn)生的數(shù)字顏色信號(hào)易于單片機(jī)進(jìn)行處理。在電路中，下位機(jī)部分主要負(fù)責(zé)獲取電致變色器件變色參數(shù)及控制電致變色器件的顏色變化;而上位機(jī)部分主要負(fù)責(zé)把下位機(jī)獲取的電致變色器件變色參數(shù)進(jìn)行電壓到顏色的曲線擬合，并通過藍(lán)牙通信把擬合曲線參數(shù)傳遞給下位機(jī)。結(jié)果表明，該電路能自動(dòng)根據(jù)環(huán)境顏色提供-4~4 V范圍步進(jìn)為0.1 V的電壓來(lái)驅(qū)動(dòng)電致變色器件的顏色顯示，與傳統(tǒng)的顏色識(shí)別電路設(shè)計(jì)相比，識(shí)別的精度和速度都得到了明顯改善。 Abstract: In this paper， a portable adaptive circuit for color identification(PACCI) based on MCU was designed. Compared to the traditional color identification circuit， the PACCI adopts digital sensor to detect the color data from external environment and further generate digital color data， which can be processed easily by MCU. In PACCI， the slave is mainly responsible for detecting the color parameters of the corresponding elcreochromic device and further driving it. For the master， which is mainly responsible for the color curve fitting based on the parameters of the electrochromic device， and transmits the fitting parameters to the slave through the bluetooth device. The results show that the PACCI can provide the basis voltage range from -4V to 4V automatically based on the colors of external environment with step as 0.1V to drive the corresponding electrochromic device. Compared to the traditional color recognition circuit， the recognition accuracy and speed of PACCI have been improved significantly.
上傳時(shí)間： 2013-11-09
上傳用戶：franktu
為了提高傳統(tǒng)溫度控制系統(tǒng)的性能，將PID控制理論與嵌入式系統(tǒng)相結(jié)合，采用瑞薩電子公司的H8S/2166作為核心處理器，AD公司的AD7705以及熱敏電阻溫度傳感器作為溫度檢測(cè)單元，利用4×6小鍵盤、LCD顯示器和S1D13305液晶控制器達(dá)到良好的人機(jī)交互，設(shè)計(jì)出了一個(gè)應(yīng)用于化工領(lǐng)域的嵌入式實(shí)時(shí)溫度控制系統(tǒng)。相比于傳統(tǒng)溫度控制系統(tǒng)，該系統(tǒng)提供了更強(qiáng)的計(jì)算能力和可擴(kuò)展能力，采用增量PID控制算法實(shí)現(xiàn)復(fù)雜控制。通過實(shí)驗(yàn)，該系統(tǒng)能達(dá)到0.1 ℃的溫度控制精度以及小于120 s的溫度穩(wěn)定時(shí)間。 Abstract: In order to improve the performance of conventional temperature control system， combining PID control theory with embedded systems， using the Renesas Electronics Corp. H8S/2166 micro-controller as a core processors， AD7705 and thermistor temperature sensor as a temperature detection unit and 4×6 small keyboard， LCD and S1D13305 LCD controller as a good human-computer interaction， this paper designed an embedded real-time temperature control system which is applied in chemical industry. Compared with conventional temperature control system， this system provides more computing power and extensibility， and adopts PID control algorithm for complex control. Through the experiment， the system can reach temperature control accuracy of 0.1 ℃ and temperature stabilization time of less than 120 seconds.
標(biāo)簽： 瑞薩電子 微控制器 溫度控制 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2014-12-26
上傳用戶：003030
設(shè)計(jì)了一種基于PIC16C71單片機(jī)的數(shù)字水溫配制閥。該配制閥采用NTC熱敏電阻作溫度傳感器，與固定電阻組成簡(jiǎn)單分壓電路作為水溫測(cè)量電路，利用PIC16C71單片機(jī)內(nèi)置的8位A/D轉(zhuǎn)換器把熱敏電阻上的模擬電壓轉(zhuǎn)換為數(shù)字量，PIC16C71單片機(jī)控制直流電機(jī)驅(qū)動(dòng)混水閥調(diào)節(jié)冷熱水的混合比例實(shí)現(xiàn)水溫調(diào)節(jié)。給出了控制電路圖，對(duì)水溫測(cè)量電路的參數(shù)選擇和測(cè)溫精度作了詳細(xì)討論。實(shí)驗(yàn)和分析表明，選用阻值較大的NTC熱敏電阻和分壓電阻可較好地解決熱敏電阻因功耗較大造成的熱擊穿問題。 Abstract: A digital valve for controlling water temperature based on PIC16C71 was presented in this paper.A bleeder circuit which consisted of a NTC thermistor as temperature sensor and a fixed resistance was designed as water temperature measuring circuit.The analog voltage on the thermistor was converted into digital signal by a 8-bit A/D converter embedded in PIC16C71. Based on the digital signal， the MCU PIC16C71 drived the valve by a DC motor to adjust the water temperature through adjusting the proportion of hot water and cold water.The circuit diagram of controller was given，the principle，the component parameters and the accuracy of measuring temperatures were also dissertated in detail. It was found by experiment and analysis that thermal breakdown of thermistor caused by high power could be solved by selecting thermistor and fixed resistance with high impedance value.
上傳時(shí)間： 2013-11-08
上傳用戶：Yue Zhong
目錄： 1. Character Type Functions － 字符類型函數(shù) 2. Standard C Input/Output Functions － 標(biāo)準(zhǔn)輸入輸出函數(shù) 3. Standard Library Functions － 標(biāo)準(zhǔn)庫(kù)和內(nèi)存分配函數(shù) 4. Mathematical Functions － 數(shù)學(xué)函數(shù) 5. String Functions － 字符串函數(shù) 6. BCD Conversion Functions － BCD 轉(zhuǎn)換函數(shù) 7. Memory Access Functions － 存儲(chǔ)器訪問函數(shù) 8. Delay Functions － 延時(shí)函數(shù) 9. LCD Functions － LCD函數(shù) 10. LCD Functions for displays with 4x40 characters － 4×40 字符型LCD函數(shù) 11. LCD Functions for displays connected in 8 bit memory mapped mode －以8 位外部存儲(chǔ) 器模式接口的LCD顯示函數(shù) 12. I2C Bus Functions － I2C 總線函數(shù) 13. National Semiconductor LM75 Temperature Sensor Functions － LM75 溫度傳感器函數(shù) 14. Dallas Semiconductor DS1621 Thermometer/Thermostat Functions － DS1621 溫度計(jì)函 數(shù) 15. Philips PCF8563 Real Time Clock Functions － PCF8563 實(shí)時(shí)時(shí)鐘函數(shù) 16. Philips PCF8583 Real Time Clock Functions － PCF8583 實(shí)時(shí)時(shí)鐘函數(shù) 17. Dallas Semiconductor DS1302 Real Time Clock Functions － DS1302 實(shí)時(shí)時(shí)鐘函數(shù) 18. Dallas Semiconductor DS1307 Real Time Clock Functions － DS1307 實(shí)時(shí)時(shí)鐘函數(shù) 19. 1 Wire Protocol Functions － 單線通訊協(xié)議函數(shù) 20. Dallas Semiconductor DS1820/DS1822 Temperature Sensors Functions － DS1820/1822 溫度傳感器函數(shù) 21. SPI Functions － SPI 函數(shù) 22. Power Management Functions － 電源管理函數(shù) 23. Gray Code Conversion Functions － 格雷碼轉(zhuǎn)換函數(shù)
標(biāo)簽： AVR 庫(kù)函數(shù)
上傳時(shí)間： 2013-10-22
上傳用戶：歸海惜雪
以C8051F020為核心處理器，設(shè)計(jì)無(wú)線傳感器網(wǎng)絡(luò)數(shù)據(jù)采集系統(tǒng)。系統(tǒng)采用SZ05-ADV型無(wú)線通訊模塊組建Zigbee無(wú)線網(wǎng)絡(luò)，結(jié)合嵌入式系統(tǒng)的軟硬件技術(shù)，完成終端節(jié)點(diǎn)的8路傳感器信號(hào)的數(shù)據(jù)采集。現(xiàn)場(chǎng)8路信號(hào)通過前端處理后，分別送入C8051F020的12位A/D轉(zhuǎn)換器進(jìn)行轉(zhuǎn)換。經(jīng)過精確處理、存儲(chǔ)后的現(xiàn)場(chǎng)數(shù)據(jù)，通過Zigbee無(wú)線網(wǎng)絡(luò)傳送到上位機(jī)，系統(tǒng)可達(dá)到汽車試驗(yàn)中無(wú)線測(cè)試的目的。 Abstract: This paper designs a wireless sensor network system for data acquisition with C8051F020 as core processors.The system used SZ05-ADV wireless communication module，set up a Zigbee wireless network， combined with hardware and software technologies of embedded systems，completed the end-node 8-locale sensor signal data acquisition.Eight locale signals were sent separately into the 12-bit ADC of C8051F020 for conversion through front treatment.After accurate processing and storage，the locale data was transmitted to the host computer through Zigbee wireless.The system achieves the purpose of wireless testing in vehicle trial.
標(biāo)簽： C8051F020 Zigbee 汽車測(cè)試 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-11-23
上傳用戶：dsgkjgkjg
為提高電容測(cè)量精度，針對(duì)電容式傳感器的工作原理設(shè)計(jì)了基于PIC16LF874單片機(jī)電容測(cè)量模塊。簡(jiǎn)單闡述了電容測(cè)量電路的應(yīng)用背景和國(guó)內(nèi)外研究現(xiàn)狀，介紹了美國(guó)Microchip公司PIC16LF874單片機(jī)的特性。電容式傳感器輸出的動(dòng)態(tài)微弱電容信號(hào)通過PS021型電容數(shù)字轉(zhuǎn)換器把模擬量數(shù)據(jù)轉(zhuǎn)換成數(shù)字量數(shù)據(jù)，所測(cè)數(shù)據(jù)由PIC16LF874單片機(jī)應(yīng)用程序進(jìn)行處理、顯示和保存。實(shí)驗(yàn)結(jié)果表明，固定電容標(biāo)稱值為10~20 pF 的測(cè)量值相對(duì)誤差在1%以內(nèi)，同時(shí)也可知被測(cè)電容容值越大，測(cè)量值和標(biāo)稱值相對(duì)誤差越小。 Abstract: To improve the accuracy of capacitance measurement，aimed at the principle of work of mercury capacitance acceleration transducer，the design of micro capacitance measurement circuit is based on the key PIC16LF874 chip. Briefly discusses the application of the capacitance measuring circuit for the background and status of foreign researchers，focusing on the United States PIC16LF874 microcontroller features. Capacitive sensor outputed signal through the dynamics of weak PS021-chip capacitors （capacitancedigital converter） to convert analog data into digital data，the measured data from the PIC16LF874 microcontroller application process， display and preservation. Experimental results show that the fixed capacitor 10pF ~ 20pF nominal value of the measured value of relative error is within 1%，but also it canbe seen the value of the measured capacitance larger，measuring value and the nominal value of relative error smaller.
上傳時(shí)間： 2013-10-29
上傳用戶：wojiaohs
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