基于80c51單片機(jī)的漏電保護(hù)裝置設(shè)計(jì)(存儲版)
【正文】 tropopause),e can expect a lot of turbulence.The supersonic descent could happen as early as Sunda.The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform.Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子。想要的，不想要的，界限明確，好像沒有什么可以撼動自己。 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。s governing body, has also ordered an immediate investigation into the referee39。s antiracism taskforce, is in London for the Football Association39。damagesbased agreement. In England and Wales, your solicitor can39。t agree with the disciplinary action your employer has taken against you 過流保護(hù)：過流保護(hù)動作電流為30mA。當(dāng)51單片機(jī)引腳輸出高電平時，PNP三極管2N3906截止，繼電器線圈兩端沒有電位差，繼電器銜鐵釋放，繼電器的常開觸點(diǎn)釋放，相當(dāng)于開關(guān)斷開。二、主要單元電路的設(shè)計(jì) 穩(wěn)壓電源電路的設(shè)計(jì)當(dāng)輸入電壓在7~25V變化時，通過降壓，然后再將降壓后的電壓通過升壓，然后通過低壓差穩(wěn)壓路固定輸出一個5V的值。當(dāng)輸入高電平時，晶體管飽和導(dǎo)通，繼電器線圈通電，觸點(diǎn)吸合。方案三：康錳銅電阻絲是電流測量中很常用取樣電阻，其特點(diǎn)在于溫度漂移量非常小。電壓檢測由三相交流變壓器、整流濾波電路和分壓電路組成。方案四：~25V通過降壓變?yōu)?V,，最后再通過一個LDO直流穩(wěn)壓電路，具有較低的靜態(tài)電流和壓差，主要用于壓差較小的場合，可固定輸出電壓5V。方案二：將Buck與Boost兩種形式的變換器結(jié)合起來，產(chǎn)生一種新的變換器，叫做BUCKBOOST變換器，也叫升降壓式變換器。方案二：采用STC89C58RD+。電壓檢測和引腳判定有康銅絲和ADC0804組成，完成AD采樣和芯片引腳個數(shù)的判定。排除漏電故障后，按下K恢復(fù)輸出。（2）連接方式不變，RL阻值固定為5Ω。此直流穩(wěn)壓電源及漏電保護(hù)裝置是基于升降壓電路和LDO低壓差穩(wěn)壓電路設(shè)計(jì)的線性直流穩(wěn)壓電源。完善開關(guān)電源的直流穩(wěn)壓電源應(yīng)具有漏電保護(hù)裝置，漏電動作電流30mA的漏電保護(hù)裝置，作為防止人體直接或間接保護(hù)。（4）制作一個功率測量與顯示電路，實(shí)時顯示穩(wěn)壓電源的輸出功率。（3）盡量減少漏電保護(hù)裝置的接入功耗。 圖1 系統(tǒng)設(shè)計(jì)框架 總體電路圖設(shè)計(jì)圖2 電路框圖當(dāng)直流輸入電壓在7~25V變化時，通過一個BuckBoost電路拓補(bǔ)結(jié)構(gòu)讓其穩(wěn)定輸出5V的電壓，再使用康銅絲鏈接一個放大電路，通過ADC0804采樣獲得是是實(shí)時的電流、電壓值并在1602上顯示，當(dāng)檢測電路電流超過30mA時，漏電保護(hù)電路啟動，斷開電路并進(jìn)行報(bào)警。綜合比較后，選擇方案二。優(yōu)點(diǎn)：效率高、電路簡單、電壓變比可由零到無窮大，即可升壓又可降壓。所以此電路具有效率高、壓差小、靜態(tài)電流小、外接元件小的優(yōu)勢。此電路質(zhì)量可靠，抗干擾性強(qiáng)。 關(guān)斷保護(hù)電路的設(shè)計(jì)方案一：漏電保護(hù)電路主要包括：檢測元件（零序電流互感器）、中間環(huán)節(jié)（放大器、比較器、脫扣器）、執(zhí)行元件（主開關(guān)）等幾個部分。方案三：IGBT（絕緣柵雙極型晶體管）兼有場效應(yīng)晶體管輸入阻抗高、驅(qū)動功率小和雙極型晶體管電壓、電流容量大及管壓降低的特點(diǎn)。電阻增大則電路效率下降，所以康銅絲對電路的影響可以完全忽略不計(jì)。采用低噪聲、高共模抑制、高輸入阻抗、低功耗的高性能儀表放大器INA128。顯示輸出功率有顯示過流保護(hù)的動作電流30mA發(fā)揮部分漏電保護(hù)裝置沒有動作時，輸出電壓≥漏電保護(hù)裝置電流誤差絕對值≤5%實(shí)際誤差≤1%要求接入功耗低實(shí)際功耗低 結(jié)果分析： 各項(xiàng)結(jié)果都符合系統(tǒng)指標(biāo)，產(chǎn)生誤差的原因包括：電阻精度不夠等。ta damagesbased agreement, you should make sure you39。s about how he felt and I would like to speak to him first to find out what his experience was.Uefa has May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一
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