【正文】
From the corner at the beginning of deep friendship。二十年的人生軌跡深深淺淺,突然就感覺(jué)到有些事情,非做不可了。nearest CAB.For more information about making a claim to an employment tribunal, see指 導(dǎo) 教師:劉春喜 張繼華 李國(guó)華教研室主任:李洪珠時(shí) 間:2013年 1 月 6 日g an employment tribunal claimEmployment tribunals sort out disagreements between employers and employees.You may need to make a claim to an employment tribunal if: (2) 在選取元器件型號(hào)和參數(shù)時(shí),缺少實(shí)際經(jīng)驗(yàn)難以找到合適的元件。 圖27 主程序流程圖 定時(shí)中斷子程序 定時(shí)器中斷子程序中有定時(shí)器0和定時(shí)器1中斷,定時(shí)器0控制占空比變化步進(jìn)為1,如圖28;定時(shí)器1控制占空比變化步進(jìn)為5,如圖29。不過(guò),在電容C值足夠大時(shí),誤差很小,基本可以忽略。關(guān)鍵詞:MATLAB 升壓斬波 PWM目 錄0引言 11 升壓斬波電路的基本原理 22 單片機(jī)PWM 4 4 總體硬件組成框圖 5 硬件組成 5 AT89S51單片機(jī)的最小應(yīng)用系統(tǒng) 5 LED顯示電路 6 按鍵接口電路 6 系統(tǒng)的軟件設(shè)計(jì) 7 定時(shí)中斷子程序 7 按鍵及顯示子程序 83 仿真結(jié)果及結(jié)論 94 個(gè)人心得體會(huì) 14參考文獻(xiàn) 15附錄1 單片機(jī)程序語(yǔ)言 16附錄2 整體電路圖 19遼寧工程技術(shù)大學(xué)電力電子技術(shù)課程設(shè)計(jì)0引言 直流斬波電路的種類較多,包括六種基本斬波電路:降壓斬波電路、升壓斬波電路、升降壓斬波電路、Cuk斬波電路、Sepicc斬波電路和Zeta斬波電路。1 升壓斬波電路的基本原理 升壓斬波電路的原理圖如圖1所示。 目前AT89S51單片機(jī)多采用40個(gè)引腳的雙列直插封裝(DIP)方式,其引腳分布如下圖所示:圖21 AT89S51雙列直插封裝方式的引腳AT89S51單片機(jī)無(wú)PWM輸出功能,可以采用定時(shí)器配合軟件的方法輸出。本系統(tǒng)采用MATLAB自帶的動(dòng)態(tài)仿真集成環(huán)境SIMULINK進(jìn)行仿真。 (2) 對(duì)直流斬波及單片機(jī)程序及外電路設(shè)計(jì)有了更深層次的理解。ts about how he felt and I would like to speak to him first to find out what his experience was.Uefa hast want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jumpWhen he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely.If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。也曾經(jīng)好像已經(jīng)下定了決心去做某件事,但更多的時(shí)候是最后又打起了退堂鼓。s actions.CSKA said they were surprised and disappointed by Toure39。t charge you more than 35% of your pensation (2)負(fù)載不變?yōu)?00,頻率1KHz,占空比從5%到95%以等百分比遞增時(shí),直流升壓斬波電路的負(fù)載輸出波形及輸出電壓大小。即滿足理論計(jì)算公式。注意,本最小應(yīng)用系統(tǒng)只能作為小型的數(shù)字量測(cè)控單元。設(shè)V處于通態(tài)的時(shí)間為,此階段電感L上積蓄的能量為。遼寧工程技術(shù)大學(xué) 電力電子技術(shù)課程設(shè)計(jì) 設(shè) 計(jì) 題 目 基于51單片機(jī)觸發(fā)的直流升壓斬波電路研究 指 導(dǎo) 教 師 劉春喜 院(系、部) 電氣控制工程 專 業(yè) 班 級(jí) 電力101班 學(xué) 號(hào) 1005030104 姓 名 馮旭 日 期 2013年1月13日 摘 要 本設(shè)計(jì)基于AT89S51單片機(jī)為核心的PWM升壓斬波電路(Boost Chopper)。因電感C值很大,基本保持輸出電壓為恒值,即為。在構(gòu)建AT89S51單片機(jī)最小應(yīng)用系統(tǒng)時(shí),AT89S51單片機(jī)需要外接時(shí)鐘電路和復(fù)位電路即可,如圖24所示。其仿真電路圖如圖41所示:圖31 仿真電路圖 周期設(shè)為1KHz ,占空比為50%,電感為10mH,電容為2200uF,負(fù)載為100時(shí)進(jìn)行仿真,仿真結(jié)果如下:圖32 圖33 由圖32中V1可以看到負(fù)載兩端的電壓與輸入電壓基本上成2倍的關(guān)系。最終成績(jī): 評(píng)定教師簽字:課程設(shè)計(jì)任務(wù)書(shū)一、設(shè)計(jì)題目基于51單片機(jī)觸發(fā)的直流升壓斬波電路研究二