最近幾年，電動車普遍使用了所謂三段式充電器，第(di)(di)(di)一個(ge)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)叫(jiao)(jiao)(jiao)恒(heng)流(liu)(liu)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)，第(di)(di)(di)二(er)(er)(er)個(ge)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)叫(jiao)(jiao)(jiao)恒(heng)壓階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)，第(di)(di)(di)三(san)(san)(san)個(ge)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)叫(jiao)(jiao)(jiao)涓流(liu)(liu)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)。從電(dian)(dian)(dian)(dian)子技術角度針(zhen)對電(dian)(dian)(dian)(dian)池而言：第(di)(di)(di)一個(ge)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)叫(jiao)(jiao)(jiao)充(chong)(chong)電(dian)(dian)(dian)(dian)限流(liu)(liu)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)，第(di)(di)(di)二(er)(er)(er)個(ge)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)叫(jiao)(jiao)(jiao)高恒(heng)壓階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)，第(di)(di)(di)三(san)(san)(san)個(ge)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)叫(jiao)(jiao)(jiao)低(di)恒(heng)壓階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)比較貼切。第(di)(di)(di)二(er)(er)(er)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)和(he)(he)第(di)(di)(di)三(san)(san)(san)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)轉(zhuan)換(huan)時，面(mian)板指示燈(deng)相應變換(huan)，大多(duo)數(shu)充(chong)(chong)電(dian)(dian)(dian)(dian)器第(di)(di)(di)一、二(er)(er)(er)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)是紅燈(deng)，第(di)(di)(di)三(san)(san)(san)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)變綠燈(deng)。第(di)(di)(di)二(er)(er)(er)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)和(he)(he)第(di)(di)(di)三(san)(san)(san)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)的相互轉(zhuan)換(huan)是由充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)(liu)決定的，大于(yu)某(mou)電(dian)(dian)(dian)(dian)流(liu)(liu)進入第(di)(di)(di)一第(di)(di)(di)二(er)(er)(er)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)，小于(yu)某(mou)電(dian)(dian)(dian)(dian)流(liu)(liu)進入第(di)(di)(di)三(san)(san)(san)階(jie)(jie)段(duan)(duan)(duan)(duan)(duan)。這個(ge)電(dian)(dian)(dian)(dian)流(liu)(liu)叫(jiao)(jiao)(jiao)轉(zhuan)換(huan)電(dian)(dian)(dian)(dian)流(liu)(liu)，也(ye)叫(jiao)(jiao)(jiao)轉(zhuan)折電(dian)(dian)(dian)(dian)流(liu)(liu)。

    買新(xin)充電(dian)(dian)(dian)(dian)(dian)(dian)器要(yao)檢查三(san)段(duan)式(shi)充電(dian)(dian)(dian)(dian)(dian)(dian)器的(de)三(san)個(ge)重(zhong)要(yao)參(can)數(shu)(shu)，第一(yi)個(ge)重(zhong)要(yao)參(can)數(shu)(shu)是(shi)涓流(liu)(liu)階段(duan)的(de)低恒壓(ya)(ya)(ya)值(zhi)，第二個(ge)重(zhong)要(yao)參(can)數(shu)(shu)是(shi)第二階段(duan)的(de)高(gao)恒壓(ya)(ya)(ya)值(zhi)，第三(san)個(ge)重(zhong)要(yao)參(can)數(shu)(shu)是(shi)轉換電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。這三(san)個(ge)重(zhong)要(yao)參(can)數(shu)(shu)與電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)數(shu)(shu)目有關(guan)，與電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)容量Ah有關(guan)，與溫度有關(guan)，與電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)種類有關(guan)。用戶一(yi)般可以自己測(ce)得第三(san)階段(duan)的(de)低恒壓(ya)(ya)(ya)值(zhi)。方(fang)法是(shi)，不接電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)，給充電(dian)(dian)(dian)(dian)(dian)(dian)器加市電(dian)(dian)(dian)(dian)(dian)(dian)，用數(shu)(shu)字(zi)萬用表的(de)200V直流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)檔測(ce)的(de)輸出電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)。另兩個(ge)參(can)數(shu)(shu)高(gao)恒壓(ya)(ya)(ya)值(zhi)和轉折電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)一(yi)般需要(yao)專(zhuan)用工具才能測(ce)得。