充電機如何控制過充?
我們(men)平(ping)時給充(chong)(chong)(chong)電(dian)(dian)機充(chong)(chong)(chong)電(dian)(dian),當蓄電(dian)(dian)池充(chong)(chong)(chong)滿(man)電(dian)(dian)后我們(men)就(jiu)直接把(ba)充(chong)(chong)(chong)電(dian)(dian)機線(xian)拔掉,其實這樣的(de)(de)(de)作法(fa)是完(wan)(wan)全(quan)錯(cuo)誤的(de)(de)(de)。充(chong)(chong)(chong)電(dian)(dian)工作完(wan)(wan)成后,需要(yao)給充(chong)(chong)(chong)電(dian)(dian)機堵(du)截充(chong)(chong)(chong)電(dian)(dian)電(dian)(dian)流,否(fou)則(ze)蓄電(dian)(dian)池將(jiang)出現(xian)大量出氣、失水和溫升等過充(chong)(chong)(chong)的(de)(de)(de)反應,這將(jiang)危及到蓄電(dian)(dian)池的(de)(de)(de)使用壽命。因此(ci),隨時監測蓄電(dian)(dian)池的(de)(de)(de)充(chong)(chong)(chong)電(dian)(dian)情況是非常有必要(yao)的(de)(de)(de),確保電(dian)(dian)池能(neng)夠把(ba)電(dian)(dian)充(chong)(chong)(chong)足并且(qie)又不過充(chong)(chong)(chong)電(dian)(dian)。主要(yao)的(de)(de)(de)停充(chong)(chong)(chong)操控辦法(fa)有:
1、恒(heng)流(liu)充(chong)(chong)(chong)電(dian)(dian)(dian)定(ding)時(shi)(shi)(shi)控(kong)制法,電(dian)(dian)(dian)池(chi)(chi)充(chong)(chong)(chong)電(dian)(dian)(dian)充(chong)(chong)(chong)滿時(shi)(shi)(shi),我們可以看電(dian)(dian)(dian)池(chi)(chi)的(de)容量大(da)小,根據電(dian)(dian)(dian)流(liu)大(da)小來(lai)確認(ren)。這樣我們就要先預(yu)定(ding)好充(chong)(chong)(chong)電(dian)(dian)(dian)的(de)時(shi)(shi)(shi)間,預(yu)定(ding)的(de)充(chong)(chong)(chong)電(dian)(dian)(dian)時(shi)(shi)(shi)間一(yi)到(dao),充(chong)(chong)(chong)電(dian)(dian)(dian)機就發(fa)布信號停充(chong)(chong)(chong)。定(ding)時(shi)(shi)(shi)器(qi)可由時(shi)(shi)(shi)間繼電(dian)(dian)(dian)器(qi)充(chong)(chong)(chong)當,或許由單片機承當其(qi)功用(yong)。這種辦法簡單,但充(chong)(chong)(chong)電(dian)(dian)(dian)時(shi)(shi)(shi)間不能依據電(dian)(dian)(dian)池(chi)(chi)充(chong)(chong)(chong)電(dian)(dian)(dian)前狀(zhuang)況而自動調整(zheng),因此實際(ji)充(chong)(chong)(chong)電(dian)(dian)(dian)時(shi)(shi)(shi),可能會出現有(you)時(shi)(shi)(shi)欠充(chong)(chong)(chong)、有(you)時(shi)(shi)(shi)過(guo)充(chong)(chong)(chong)的(de)表象;
2、電(dian)池(chi)溫(wen)(wen)度(du)(du)操(cao),正常(chang)(chang)充(chong)電(dian)情(qing)況下,蓄電(dian)池(chi)的(de)溫(wen)(wen)度(du)(du)變(bian)化并不明顯(xian),當電(dian)池(chi)過充(chong)時(shi),內部氣(qi)體壓力將快速(su)增大,負極板上氧化反響(xiang)使(shi)內部發熱,溫(wen)(wen)度(du)(du)快速(su)上升。因此,調查電(dian)池(chi)溫(wen)(wen)度(du)(du)的(de)改(gai)變(bian),即可判別電(dian)池(chi)是否現已充(chong)溢。通常(chang)(chang)選用兩只熱敏電(dian)阻別離(li)檢(jian)測電(dian)池(chi)溫(wen)(wen)度(du)(du)和環境溫(wen)(wen)度(du)(du),當兩者溫(wen)(wen)差到達一定值時(shi),即宣布(bu)停充(chong)信號。因為熱敏電(dian)阻動態響(xiang)應(ying)速(su)度(du)(du)較(jiao)慢(man),故不能(neng)及時(shi)精確地檢(jian)測到電(dian)池(chi)的(de)滿(man)充(chong)狀況
3、電(dian)(dian)池(chi)端電(dian)(dian)壓負(fu)增(zeng)(zeng)量一(yi)般而言,當電(dian)(dian)池(chi)充足電(dian)(dian)后,其端電(dian)(dian)壓將呈現降低(di)趨勢,據此可(ke)(ke)將電(dian)(dian)池(chi)電(dian)(dian)壓出現負(fu)增(zeng)(zeng)長的時間(jian)作為(wei)停充時間(jian)。與(yu)溫(wen)度(du)操(cao)控(kong)(kong)法比較(jiao),這種辦法呼應速度(du)快,此外,電(dian)(dian)壓的負(fu)增(zeng)(zeng)量與(yu)電(dian)(dian)壓的絕對值(zhi)無關(guan),因(yin)此這種停充操(cao)控(kong)(kong)辦法可(ke)(ke)適應具有(you)不(bu)一(yi)樣單格電(dian)(dian)池(chi)數的蓄電(dian)(dian)池(chi)組充電(dian)(dian)。此辦法的缺陷是一(yi)般的檢測(ce)器靈敏(min)度(du)和(he)可(ke)(ke)靠性不(bu)高,同時,當環境(jing)溫(wen)度(du)較(jiao)高時,電(dian)(dian)池(chi)足夠電(dian)(dian)后電(dian)(dian)壓的減(jian)小并不(bu)顯著(zhu),因(yin)此難以操(cao)控(kong)(kong);
4、使用(yong)極化(hua)電(dian)(dian)(dian)壓(ya)操控(kong)通常情況下,蓄電(dian)(dian)(dian)池(chi)的極化(hua)電(dian)(dian)(dian)壓(ya)出現(xian)在(zai)(zai)電(dian)(dian)(dian)池(chi)剛好充(chong)滿后(hou),選用(yong)有關專(zhuan)利技術來(lai)測量每(mei)(mei)個(ge)單格電(dian)(dian)(dian)池(chi)的極化(hua)電(dian)(dian)(dian)壓(ya),這樣就使每(mei)(mei)個(ge)電(dian)(dian)(dian)池(chi)都可充(chong)電(dian)(dian)(dian)到它(ta)自身所(suo)需求的程度。研討表明(ming),因(yin)為每(mei)(mei)個(ge)電(dian)(dian)(dian)池(chi)在(zai)(zai)幾何(he)結構、化(hua)學(xue)性質及(ji)電(dian)(dian)(dian)學(xue)特性等方(fang)面至(zhi)少存(cun)在(zai)(zai)一(yi)些細(xi)微的不同,那么依(yi)據每(mei)(mei)個(ge)單格電(dian)(dian)(dian)池(chi)的特性來(lai)斷定它(ta)所(suo)需求的充(chong)電(dian)(dian)(dian)水平會比把蓄電(dian)(dian)(dian)池(chi)組作為一(yi)個(ge)整體(ti)來(lai)操控(kong)的辦(ban)法更加適(shi)宜一(yi)些。
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