Industrial remote monitoring systems and keep-alivecircuits spend most of their time in standby mode. Manyof these systems also depend on battery power, so powersupply effi ciency in standby state is very important tomaximize battery life. The LT®8410/-1 high effi ciencyboost converter is ideal for these systems, requiringonly 8.5μA of quiescent current in standby mode. Thedevice integrates high value (12.4M/0.4M) output feedbackresistors, signifi cantly reducing input current whenthe output is in regulation with no load. Other featuresinclude an integrated 40V switch and Schottky diode,output disconnect with current limit, built in soft-start,overvoltage protection and a wide input range, all in atiny 8-pin 2mm × 2mm DFN package.
標(biāo)簽： 465 DN 超低功耗 升壓轉(zhuǎn)換器
上傳時(shí)間： 2013-11-23
上傳用戶：新手無(wú)憂
為了有效地提升鉛酸蓄電池的使用壽命，同時(shí)實(shí)現(xiàn)對(duì)充電過(guò)程的監(jiān)控，設(shè)計(jì)出一種用單片機(jī)控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓?fù)洌B續(xù)電流工作模式，電源管理IC設(shè)計(jì)在電源的副邊，由ELAN公司的EM78P258N單片機(jī)模擬，是用可編程器件模擬電源管理IC，實(shí)現(xiàn)智能電源低成本化的一次成功嘗試，通過(guò)對(duì)單片機(jī)的軟件設(shè)計(jì)實(shí)現(xiàn)了充電電源的狀態(tài)顯示、充電時(shí)間控制、報(bào)警、過(guò)溫保護(hù)、過(guò)壓保護(hù)、過(guò)流保護(hù)等功能。本充電器真正的實(shí)現(xiàn)了鉛酸蓄電池的三段式充電過(guò)程，其最高輸出功率可達(dá)90 W，效率約85%，成本不到20元，具有很高的市場(chǎng)競(jìng)爭(zhēng)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.
標(biāo)簽： 單片機(jī)控制 充電電源 鉛酸蓄電池
上傳時(shí)間： 2013-11-16
上傳用戶：cepsypeng
采用單片機(jī)AT89C2051實(shí)現(xiàn)溫度測(cè)量與控制,鍵盤和顯示電路實(shí)現(xiàn)溫度的設(shè)定、修改、清零以及當(dāng)前溫度值的顯示,并對(duì)溫度超過(guò)上下限進(jìn)行報(bào)警。闡述了該系統(tǒng)設(shè)計(jì)的硬件和軟件設(shè)計(jì)。 Abstract: The system of temperature measuring and controling is realized based on AT89C2051.The keyboard and display circuit is designed,which can be used for setting and modifying temperature value,resetting and displaying the present temperature value.At the same time the warning circuit is also designed in the system,which can deal with the alarm when temperature exceeds the upper limit and the lower limit.The hardware and software design of the system are explained．
上傳時(shí)間： 2013-11-18
上傳用戶：leehom61
HT47R20A-1時(shí)基(Time Base)使用介紹 HT47 系列單片機(jī)的時(shí)基可提供一個(gè)周期性超時(shí)時(shí)間周期以產(chǎn)生規(guī)則性的內(nèi)部中斷。時(shí)基的時(shí)鐘來(lái)源可由掩膜選擇設(shè)定為WDT 時(shí)鐘、RTC 時(shí)鐘或指令時(shí)鐘（系統(tǒng)時(shí)鐘/4）；其超時(shí)時(shí)間范圍可由掩膜選擇設(shè)定為“時(shí)鐘來(lái)源”/212~“時(shí)鐘來(lái)源”/215。如果時(shí)基發(fā)生超時(shí)現(xiàn)象，則其對(duì)應(yīng)的中斷請(qǐng)求標(biāo)志（TBF）會(huì)被置位，如果中斷允許，則產(chǎn)生一個(gè)中斷服務(wù)到08H 的地址。
上傳時(shí)間： 2013-11-15
上傳用戶：13925096126
Backpropagation Network Time-Series Forecasting 源碼, 經(jīng)典的BPN人工神經(jīng)網(wǎng)絡(luò)例子源碼
標(biāo)簽： Backpropagation Forecasting Time-Series Network
上傳時(shí)間： 2015-01-05
上傳用戶：tb_6877751
Unix和NT上NetWork Time網(wǎng)絡(luò)協(xié)議（4.0版本）
標(biāo)簽： NetWork Unix Time 4.0
上傳時(shí)間： 2014-01-01
上傳用戶：鳳臨西北
rtai-3.1-test3的源代碼(Real-Time Application Interface )
標(biāo)簽： Application Real-Time Interface rtai
上傳時(shí)間： 2014-11-22
上傳用戶：lps11188
S3C44BOX的BIOS。可使用的命令：help --- show help ? --- = help date --- show or set current date time --- show or set current time setweek --- set weekday clock --- show system running clock setmclk --- set system running clock setbaud ------ set baud rate ipcfg ------ show or set IP address load ------ load file to ram comload ------ load file from serial port run ------ run from sdram prog ------ program flash copy ------ copy flash from src to dst address boot ------ boot from flash backup ------ move bios to the top of flash md ------ show memory data move ------ move program from flash to sdram
標(biāo)簽： help date show current
上傳時(shí)間： 2015-01-22
上傳用戶：ANRAN
A Real Time Linux 一篇介紹如何在Linux這樣時(shí)間共享操作系統(tǒng)之上添加硬實(shí)時(shí)功能的方法。
標(biāo)簽： Linux Real Time 操作系統(tǒng)
上傳時(shí)間： 2014-01-09
上傳用戶：a6697238
Small utility which calculates the difference in hours and seconds between a starting time and finish time. Useful for calculating payroll hours, overtime, etc. with C source code. Freeware.
標(biāo)簽： calculates difference and starting
上傳時(shí)間： 2015-02-07
上傳用戶：jing911003
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