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CS H/L 模組片選端 高電平有效5 SID H/L 串行數(shù)據(jù) 輸出端 6 CLK H/L 串行同步時(shí)鐘15 PSB L 串口方式 17 RESET H/L 復(fù)位端,低電 平有效19 A VDD 背光源電壓+5V 20 K VSS 背光源負(fù)端 0V 注釋?zhuān)海?)如在實(shí)際應(yīng)用中僅使用串口通訊模式,可將PSB接固定低電平,也可以將模塊上的J8和“GND”用焊錫短接。 (2)模塊內(nèi)部接有上電復(fù)位電路,因此在不需要經(jīng)常復(fù)位的場(chǎng)合可將該端懸空。 (3)如背光和模塊共用一個(gè)電源,可以將模塊上的JA、JK用焊錫短接。 .并行接口 管腳號(hào)管腳名稱(chēng)電平管腳功能描述1VSS0V電源地2VCC+5V電源正3V0對(duì)比度(亮度)調(diào)整4RS(CS)H/LRS=“H”,表示DB7——DB0為顯示數(shù)據(jù)RS=“L”,表示DB7——DB0為顯示指令數(shù)據(jù)5R/W(SID)H/LR/W=“H”,E=“H”,數(shù)據(jù)被讀到DB7——DB0R/W=“L”,E=“H→L”, DB7——DB0的數(shù)據(jù)被寫(xiě)到IR或DR6E(SCLK)H/L使能信號(hào)7DB0H/L三態(tài)數(shù)據(jù)線8DB1H/L三態(tài)數(shù)據(jù)線9DB2H/L三態(tài)數(shù)據(jù)線10DB3H/L三態(tài)數(shù)據(jù)線11DB4H/L三態(tài)數(shù)據(jù)線12DB5H/L三態(tài)數(shù)據(jù)線13DB6H/L三態(tài)數(shù)據(jù)線14DB7H/L三態(tài)數(shù)據(jù)線15PSBH/LH:8位或4位并口方式,L:串口方式(見(jiàn)注釋1)16NC空腳17/RESETH/L復(fù)位端,低電平有效(見(jiàn)注釋2)18VOUTLCD驅(qū)動(dòng)電壓輸出端19AVDD背光源正端(+5V)(見(jiàn)注釋3)20KVSS背光源負(fù)端(見(jiàn)注釋3)注釋 (1),如在實(shí)際應(yīng)用中僅使用并口通訊模式,可將PSB接固定高電平,也可以將模塊上的J8和“VCC”用焊錫短接。 (2),模塊內(nèi)部接有上電復(fù)位電路,因此在不需要經(jīng)常復(fù)位的場(chǎng)合可將該端懸空。 (3),如背光和模塊共用一個(gè)電源,可以將模塊上的JA、JK用焊錫短接。5,總電路軟件實(shí)現(xiàn)流程圖 系統(tǒng)初始化讀EEROM中上次使用的電壓編號(hào)根據(jù)編號(hào)讀電壓把電壓數(shù)據(jù)送到DA允許定時(shí)器中斷顯示掃描鍵盤(pán)是否KET1下一個(gè)電壓處理子程序是否KEY2是否KEY3 6.電源測(cè)試結(jié)果 ,電壓測(cè)試 預(yù)置電壓(V)顯示電壓(V)測(cè)量電壓(V)1235789 ,性能測(cè)試 性能指標(biāo)測(cè)量條件測(cè)量結(jié)果測(cè)量?jī)x表全程輸出電壓DM311型數(shù)字萬(wàn)用表負(fù)載電流=5V, =25 206mA過(guò)流保護(hù)330mA結(jié)論本文介紹的是利用采用AT89S52單片機(jī)作為整機(jī)的控制單元,通過(guò)改變DAC0832的輸入數(shù)字量來(lái)改變輸出電壓值,從而使輸出功率管的基極電壓發(fā)生變化,間接地改變輸出電壓的大小的直流穩(wěn)壓電源,并詳細(xì)說(shuō)明了軟件和設(shè)計(jì)方法及仿真、硬件實(shí)現(xiàn)。在設(shè)計(jì)過(guò)程中可以看出,匯編語(yǔ)言有著其獨(dú)特的魅力,它簡(jiǎn)單易學(xué),語(yǔ)法錯(cuò)誤容易糾正;用單片機(jī)實(shí)現(xiàn)直流穩(wěn)壓電源的的設(shè)計(jì)是比較方便和易于實(shí)現(xiàn)的。通過(guò)直流穩(wěn)壓電源的設(shè)計(jì)和制作,加深了對(duì)單片機(jī)的理解,能夠更熟練地應(yīng)用單片機(jī)實(shí)現(xiàn)預(yù)期的功能,對(duì)今后的工作有很大的幫助用單片機(jī)控制電源時(shí),液晶屏顯示清晰正確,誤差較小,完美的實(shí)現(xiàn)了數(shù)控恒壓源這一課題?! ? 但在功能上還不夠強(qiáng)大,沒(méi)有顯示預(yù)置電壓等等,還可以進(jìn)一步得到提高。 致 謝在后期系統(tǒng)設(shè)計(jì)中,我得到了指導(dǎo)老師的細(xì)心指導(dǎo)和其他同學(xué)的熱心幫助,他們使我的開(kāi)發(fā)進(jìn)度沒(méi)有出現(xiàn)停滯,讓我少走了不少?gòu)澛?。這也使我明白了一個(gè)道理,沒(méi)有人可以事無(wú)巨細(xì),全部做到?jīng)]有遺漏,總有些你能力無(wú)法企及的地方。相互交流才是解決這些問(wèn)題的最佳方法。通過(guò)這次的畢業(yè)論文設(shè)計(jì),不僅提高了我解決問(wèn)題的能力,更是鍛煉了我自己動(dòng)手編程能力,為我今后的發(fā)展提供了寶貴的實(shí)踐經(jīng)驗(yàn)。 簽名: 年 月 日 參考文獻(xiàn) [1] 康華光 電子技術(shù)基礎(chǔ)【M】 高等教育出版社 [2] 串聯(lián)型直流穩(wěn)壓電源的仿真分析【N】廣西師范學(xué)院學(xué)報(bào) 第21卷第2期[3] 用單片機(jī)制作的直流穩(wěn)壓可調(diào)電源【J】 電子世界 2005年第11期[4] 劉華毅,李霞,徐景德 電力電子技術(shù)【J】 第35卷第六期2001年12月[5] 陳小忠、黃寧、趙小俠 單片機(jī)接口技術(shù)實(shí)用子程序【M】 人民郵電出版社[6] 樓然苗 單片機(jī)課程設(shè)計(jì)指導(dǎo)[M] 北京航空航天大學(xué)出版社[7] 何希才 新型開(kāi)關(guān)電源及其應(yīng)用【M】 人民郵電出版社 湖北工業(yè)大學(xué)工程技術(shù)學(xué)院畢業(yè)論文附件材料學(xué)生姓名: 高旭 學(xué) 號(hào): 0825021226 所在系部: 電氣信息系 專(zhuān)業(yè)班級(jí): 08gz信工2班 指導(dǎo)教師: 周茉 日 期: 2011年6月3日 目 錄1 英文文獻(xiàn)翻譯………………………………………………………………………1 英文文獻(xiàn)原文…………………………………………………………………2 中文翻譯……………………………………………………………………….2 專(zhuān)業(yè)閱讀書(shū)目……………………………………………………………………… 1 英文文獻(xiàn)翻譯 英文文獻(xiàn)原文題目With the rapid development of electronic technology, application field of electronic system is more and more extensive, electronic equipment, there are more and more people work with electronic equipment, life is increasingly close relationship. Any electronic equipment are inseparable from reliable power supply for power requirements, they more and more is also high. Electronic equipment miniaturized and low cost in the power of light and thin, small and efficient for development direction. The traditional transistors series adjustment manostat is continuous control linear manostat. This traditional manostat technology more mature, and there has been a large number of integrated linear manostat module, has the stable performance is good, output ripple voltage small, reliable operation, etc. But usually need are bulky and heavy industrial frequency transformer and bulk and weight are big filter. In the 1950s, NASA to miniaturization, light weight as the goal, for a rocket carrying the switch power development. In almost half a century of development process, switch power because of its small volume, light weight, high efficiency, wide range, voltage advantages in electric, control, puter, and many other areas of electronic equipment has been widely used. In the 1980s, a puter is made up of all of switch power supply, the first plete puter power generation. Throughout the 1990s, switching power supply in electronics, electrical equipment, home appliances areas to be widely, switch power technology into the rapid development. In addition, large scale integrated circuit technology, and the rapid development of switch power supply with a qualitative leap, raised high frequency power products of, miniaturization, modular tide. Power switch tube, PWM controller and highfrequency transformer is an indispensable part of the switch power supply. The traditional switch power supply is normally made by using high frequency power switch tube division and the pins, such as using PWM integrated controller UC3842 + MOSFET is domestic small power switch power supply, the design method of a more popularity. Since the 1970s, emerged in many function plete integrated control circuit, switch power supply circuit increasingly simplified, working frequenc