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畢業(yè)論文-海爾電冰箱的控制系統(tǒng)設(shè)計(jì)(文件)

 

【正文】 圖 31 電源電路 變壓器 T801將輸入的支流 220V電壓變?yōu)榻涣?16V的電壓,經(jīng)過(guò)二極管 VD805和 VD806 組成的全波整流電路整流后,在經(jīng)電容器 C806 濾波,得到一個(gè)直流 14V的電壓 。 12 溫度檢測(cè)電路和溫度調(diào)節(jié)電路 設(shè)計(jì) 溫度能給消費(fèi)群眾帶來(lái)一種直觀的感覺(jué),能準(zhǔn)確的反應(yīng)冰箱實(shí)際的工作情況,也能幫助人們有效的控制冰箱內(nèi)的食物,同時(shí)也能達(dá)到節(jié)能的效果,所以溫度的檢測(cè)電路和溫度的調(diào)節(jié)電路設(shè)計(jì)是非常有必要的。如 Uc =,冷藏室溫度為 30℃ 時(shí),傳感器阻值為 千歐。 圖 32 溫度檢測(cè)電路 溫度調(diào)節(jié)電路如圖 所示。假如沒(méi)有這兩個(gè)設(shè)計(jì),不僅不能有效的控制電冰箱的正常使用,還可能造成更多的能源浪費(fèi)。溫度傳感器檢測(cè)的電壓信號(hào) Us 加到⑦腳上,溫度調(diào)節(jié) 按 鈕預(yù)選設(shè)定的電壓 Ur 輸入到⑥腳,比較器對(duì)這兩個(gè)電壓進(jìn)行比較。電阻R801 和 R802 的直流電壓進(jìn)行分壓,使 Q802 的⑤腳電壓固定在近似 4V,冷藏室傳感器輸入的電壓 US 接入到④腳, 電壓比較器對(duì)這兩個(gè)電壓進(jìn)行比較,以確定壓縮機(jī)的狀態(tài)。假如沒(méi)有這樣的設(shè)計(jì),電冰箱整個(gè)控制電路將會(huì)一片混亂,電冰箱會(huì)出現(xiàn)各種各樣的故障,嚴(yán)重影響電冰箱的正常使用。除霜電路也是通過(guò)電壓 比較運(yùn)算放大器組成的檢知電路的輸出電位,使三極管處于飽和或截止?fàn)顟B(tài),從而控制繼電器的動(dòng)作,達(dá)到除霜的目的。 圖 36 電冰箱操作盤 圖 37 操作盤電路圖 16 該電冰箱除霜方式為半自動(dòng)除霜。也可使其對(duì)準(zhǔn)刻度盤 兩點(diǎn)之間的任意位置。這兩個(gè)電壓信號(hào)輸入到控制板中的電壓比較運(yùn)算放大器中進(jìn)行電壓比較。檢查抗干擾過(guò)流保護(hù)元件 TNR801,此元件為易損件,常因電壓過(guò)高而使頂部出現(xiàn)裂紋,若因高脈沖電壓作用而損壞,其中心部位會(huì)出現(xiàn)燒壞的一點(diǎn),損壞后必須更換次件。 如電源電路無(wú)故障,壓縮機(jī)仍不啟動(dòng),可重點(diǎn)檢查 Q802( TA753399)的 U⒌和 U⒋電壓,如 U4< U5,則壓縮機(jī)不會(huì)啟動(dòng) 。 另外, Q802U6 的電位低也會(huì)造成壓縮機(jī)不 停??捎萌f(wàn)用表直流電壓檔測(cè) 18 量繼電器線圈有無(wú)工作電壓,如有直流電壓(約 13V)說(shuō)明管已擊穿,如無(wú)直流電壓說(shuō)明 Q811 正常。如出現(xiàn)短路現(xiàn)象或除霜按鍵接觸不良,則不能發(fā)出除霜信號(hào)。分析與檢修 :通電試機(jī)壓縮機(jī)忽 轉(zhuǎn)忽停。用 95% 的酒精清洗接插件的銹蝕處 10 分鐘后插好接插件并建議用戶把冰箱移至廚房外通風(fēng)良好的地方。折下冷藏 室內(nèi)的熱敏電阻經(jīng)檢測(cè)良好打開(kāi)前控制板外蓋測(cè)量控制板上電位器 R121 、 R123 良好測(cè)后控制板運(yùn)算放大器 V6 腳有高電平輸出測(cè)二極管 D803 良好測(cè)三極管 Q811 元直流 +14V 輸出說(shuō)明已損壞。打開(kāi)前控制板外蓋測(cè)量控制板上電位器 R121 、 R123 電阻良好。通電試機(jī)故障排除 , 冰箱恢復(fù)正常運(yùn)轉(zhuǎn)。把冷藏室內(nèi)與熱敏電阻 RS 相接的 R806 電阻拆下?lián)Q上一個(gè) 的電阻使 R806 電阻阻值減小提高 V6 的電位再把 RS 相接的 R802 電阻拆下?lián)Q上一個(gè) 25k0 的電阻提高刊的電位。測(cè)控制板 Q812 三極管擊穿。t agree with the disciplinary action your employer has taken against you your employer dismisses you and you think that you have been dismissed unfairly. For more informu, take advice from one of the anisations listed under Fur ther help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. ation about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。s 150th anniversary celebrations and will attend City39。s governing body, has also ordered an immediate investigation into the referee39。或許是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多個(gè)不同的日子過(guò)成了同一天的樣子;或許是追溯過(guò)去,對(duì)自己那些近乎偏執(zhí)的怪異信念的醒悟,這些天以來(lái),思緒一直 很凌亂,在腦海中不斷糾纏。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。t remember his appearance. Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of 21 Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles / kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. We often close ourselves off when traumatic events happen in our lives。下面六個(gè)方法有助于你更完滿透徹地敞開(kāi)心扉。 。如果我們一味逃避生活中的悲傷,悲傷只 會(huì)變得更強(qiáng)烈更真實(shí) —— 悲傷原本只是稍縱即逝的情緒,我們卻固執(zhí)地耿耿于懷 By utilizing our breath we soften our experiences. If we dam them up, our lives will stagnate, but when we keep them flowing, we allow more newness and greater experiences to 。我們假裝一切仿佛都不曾發(fā)生,以此試圖忘卻傷痛, 可就算隱藏得再好,最終也還是騙不了自己。 Then in high school, think don39。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。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Age has
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