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《數(shù)字電子技術(shù)課程設(shè)計(jì)---設(shè)計(jì)定時(shí)電風(fēng)扇電路》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、摘要隨著家庭生活質(zhì)量的提高，排氣扇已經(jīng)成為人們生活中必不可少的家用電器。為了保證家庭室內(nèi)空氣的流通，排氣扇越發(fā)顯得重要。隨著排氣扇的普及，人們對(duì)排氣扇的要求也越來越高，因此具有定時(shí)功能的排氣扇更顯得科學(xué)化。本次課題設(shè)計(jì)目的是：設(shè)計(jì)定時(shí)電風(fēng)扇電路，由兩個(gè)滑動(dòng)變阻器分別控制排氣扇的總定時(shí)時(shí)間和間歇排氣的時(shí)間，并分別用發(fā)光二極管顯示狀態(tài)。首先由一個(gè)555多諧振蕩器來控制排氣扇的總定時(shí)時(shí)間，通過調(diào)節(jié)滑動(dòng)變阻器來調(diào)節(jié)定時(shí)的長(zhǎng)短；然后再用一個(gè)555多諧振蕩器來控制排氣扇的間歇排氣時(shí)間，也可以通過調(diào)節(jié)滑動(dòng)變阻器來控制時(shí)
2、間長(zhǎng)短。兩個(gè)555多諧振蕩器出來的信號(hào)經(jīng)過一個(gè)與門處理后經(jīng)過發(fā)光二極管來顯示其總的工作狀態(tài)以及間歇排氣功能。通過查找一系列資料，得出此次方案，并借助mutisim仿真軟件，本次設(shè)計(jì)除了在調(diào)節(jié)定時(shí)長(zhǎng)短時(shí)間上有點(diǎn)不精確之外，基本完成了定時(shí)和間歇排氣可調(diào)的設(shè)計(jì)要求。關(guān)鍵字：定時(shí)排氣扇、555、間歇排氣、芯片20目錄第一章設(shè)計(jì)內(nèi)容及要求··············································3第二章系統(tǒng)設(shè)計(jì)方案選擇2.1方案一··························
3、···························42.2方案二·····················································5第三章系統(tǒng)組成及工作原理3.1系統(tǒng)組成···················································63.2工作原理···················································7第四章單元電路設(shè)計(jì)、參數(shù)計(jì)算、器件選擇4.1定時(shí)控制電路·········
4、··································`84.2觸間歇控制電路··············································94.3信號(hào)綜合選擇模塊···········································11204.4排氣扇模塊·················································12第五章實(shí)驗(yàn)、調(diào)試及測(cè)試結(jié)果與分析·····························
5、···13結(jié)論······························································14參考文獻(xiàn)··························································15附錄一····························································16附錄二····················································
6、········17附錄三····························································1820第一章設(shè)計(jì)內(nèi)容與要求〖基本要求〗1.實(shí)現(xiàn)總定時(shí)8小時(shí)，并且通過調(diào)節(jié)滑動(dòng)變阻器來實(shí)現(xiàn)時(shí)間長(zhǎng)短可調(diào)。2.實(shí)現(xiàn)占空比可調(diào)的間歇排氣功能，通過調(diào)節(jié)滑動(dòng)變阻器來調(diào)節(jié)排氣和間歇的時(shí)間長(zhǎng)短。3.用兩個(gè)LED來顯示其工作狀態(tài)，一個(gè)燈來顯示其總定時(shí)，工作時(shí)間是一直亮著的，另外一個(gè)燈是間歇亮著的，來顯示其工作和間歇狀態(tài)時(shí)間。20第二章系統(tǒng)設(shè)計(jì)方案選擇方案一：本方案由排氣扇、
7、定時(shí)控制電路和間歇控制電路組成。首先由定時(shí)控制電路控制總定時(shí)即排氣扇總工作時(shí)間，可以通過調(diào)節(jié)滑動(dòng)變阻器來改變定時(shí)時(shí)間。間歇控制電路控制排氣的工作和間歇時(shí)間，也可以通過調(diào)節(jié)滑動(dòng)變阻器來改變其時(shí)間。本設(shè)計(jì)排氣扇的效果用發(fā)光二極管來顯示，二極管亮表示排氣扇工作，滅則表示不工作。其電路圖如圖2-1。圖2-1但此電路時(shí)由兩個(gè)多諧振蕩器串聯(lián)而成，由實(shí)驗(yàn)結(jié)果分析其信號(hào)不穩(wěn)定，致使時(shí)間也不穩(wěn)定，所以必須加以改進(jìn)。20方案二：本方案是對(duì)第一個(gè)方案進(jìn)行改進(jìn)后得到的，包括排氣扇、定時(shí)控制電路、間歇控制電路和信號(hào)綜合選擇四部分構(gòu)
8、成。從定時(shí)控制電路出來的信號(hào)與間歇控制電路出來的信號(hào)經(jīng)過一個(gè)與門構(gòu)成的信號(hào)選擇模塊后出來一個(gè)新信號(hào)控制排氣扇工作。其電路圖如圖2-2。圖2-2由實(shí)驗(yàn)結(jié)果分析得到，經(jīng)過改進(jìn)的電路可以很好的控制排氣扇的定時(shí)時(shí)間和間歇時(shí)間，使電路變得更完善。通過比較，本設(shè)計(jì)采用了方案二。20第三章系統(tǒng)的組成及工作原理3.1系統(tǒng)的組成本系統(tǒng)由定時(shí)控制電路、間歇控制電路、信號(hào)綜合選擇、排氣扇四個(gè)模塊構(gòu)成。通過調(diào)節(jié)滑動(dòng)變阻器來改變其工作時(shí)間，并用發(fā)光二極
