電動汽車、電動三輪車、高爾夫球車等都采用大容量鉛酸蓄電池組作為動力，大功率充電機可以對大容量的蓄電池組進行快速、安全的全自動充電，充電機采用恒流恒壓的原理對蓄電池進行安全快速充電，在充電開始階段，蓄電池的電壓較低，充電器進(jin)行恒流快速充(chong)(chong)(chong)(chong)(chong)電(dian)，充(chong)(chong)(chong)(chong)(chong)電(dian)電(dian)流可以(yi)(yi)根據蓄(xu)電(dian)池(chi)的(de)具體容量(liang)進(jin)行設定，本機可以(yi)(yi)輸出(chu)20A以(yi)(yi)下(xia)的(de)電(dian)流，隨著充(chong)(chong)(chong)(chong)(chong)電(dian)時間的(de)推移，蓄(xu)電(dian)池(chi)的(de)電(dian)壓(ya)(ya)逐(zhu)漸(jian)上升，容量(liang)逐(zhu)漸(jian)充(chong)(chong)(chong)(chong)(chong)滿，當蓄(xu)電(dian)池(chi)電(dian)壓(ya)(ya)達到預定的(de)端電(dian)壓(ya)(ya)時，充(chong)(chong)(chong)(chong)(chong)電(dian)機進(jin)入(ru)恒壓(ya)(ya)小電(dian)流充(chong)(chong)(chong)(chong)(chong)電(dian)，使(shi)蓄(xu)電(dian)池(chi)的(de)容量(liang)進(jin)一步充(chong)(chong)(chong)(chong)(chong)滿，而且充(chong)(chong)(chong)(chong)(chong)電(dian)器內部的(de)電(dian)壓(ya)(ya)比較(jiao)器輸出(chu)指示信號(hao)，綠色發光二極(ji)管點亮(liang)，在進(jin)行一段時間充(chong)(chong)(chong)(chong)(chong)電(dian)后，充(chong)(chong)(chong)(chong)(chong)電(dian)過程可以(yi)(yi)結(jie)束，本機可以(yi)(yi)對48伏(fu)以(yi)(yi)下(xia)的(de)蓄(xu)電(dian)池(chi)進(jin)行快速全自動充(chong)(chong)(chong)(chong)(chong)電(dian)，充(chong)(chong)(chong)(chong)(chong)電(dian)功率(lv)最大(da)可以(yi)(yi)達到600瓦，充(chong)(chong)(chong)(chong)(chong)電(dian)器的(de)體積(ji)為200x180x65毫米，重量(liang)約(yue)1公(gong)斤。

 STK702-015是一片功能強大的大規模厚膜開關電源電路，內含輔助電源、PWM控制、輸出驅動電路、功率場效應管輸出電路等。它和簡單而且專用的外圍電路一起組成性能可靠的開關穩壓電路。交流電源通過電源濾波器后分成兩路：一路經整流濾波后供給PWM脈寬控制驅動模塊STK702-015的31、32腳，內部PWM開始工作，產生70KHZ的開關信號并驅動功率場效應管作強勁的D類放大后由25、26腳輸出，經過特殊的LC電路推動高頻變壓器工作，經次級降壓后由快恢復二極管MOR3040PT半波整流后輸出，這里沒有濾波電容，這和普通的開關電源有些區別，理論和實踐告訴我們：脈動直流比平滑的直流對蓄電池的充電效果更好，而本機的充電脈沖頻率高達70KHZ，所以充電效果更好，充電速度更快。300伏直流另一路向輔助開關電源供電，輔助電源輸出的直流電壓通過一個開關電路后給PWM脈寬控制驅動模塊提供直流工作電壓。
當(dang)開始(shi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時，蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)較(jiao)低(di)(di)(di)，與充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)壓(ya)差較(jiao)大(da)，初(chu)始(shi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流很大(da)，如果不加以限(xian)制(zhi)，可(ke)能(neng)會損壞(huai)蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池和(he)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)，所(suo)以本機(ji)(ji)中由LM358的(de)(de)一(yi)(yi)個(ge)運(yun)放(fang)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流取樣(yang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻組(zu)成(cheng)一(yi)(yi)個(ge)自(zi)動限(xian)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，當(dang)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流超過設定的(de)(de)值時（例如10安培）電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流取樣(yang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻上的(de)(de)壓(ya)降使LM358的(de)(de)一(yi)(yi)個(ge)運(yun)放(fang)輸出低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)，控(kong)制(zhi)PWM脈(mo)寬(kuan)控(kong)制(zhi)驅動模塊(kuai)STK702-015輸出的(de)(de)脈(mo)沖寬(kuan)度變窄，從而輸出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)降低(di)(di)(di)，充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流減小。當(dang)蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)滿后（一(yi)(yi)般充(chong)(chong)滿后的(de)(de)蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)為標稱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)1.3倍）LM358的(de)(de)另一(yi)(yi)個(ge)運(yun)放(fang)組(zu)成(cheng)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)比較(jiao)器輸出低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)，這(zhe)時綠(lv)色發光二極管點亮(liang)，同時切斷PWM脈(mo)寬(kuan)控(kong)制(zhi)驅動模塊(kuai)的(de)(de)直流工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。表示充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)完成(cheng)，此時的(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)只有(you)輔助電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，功耗很小。

使用注意事項：

1。充電前先作空載檢查，接通220伏交流電源后，充電器上的紅色和綠色發光二極管均點亮，用萬用表測量一下空載輸出電壓，電壓應為待充電的蓄電池的電壓的1.2～1.3倍左右。
2。充電機輸出的正極接蓄電池的正極，負極接蓄電池的負極，不能接錯
3。充電時，蓄電池接到充電器上后，紅色發光二極管仍然點亮，而綠色發光二極管熄滅，當蓄電池充滿后當紅色和綠色發光二極管均點亮，說明蓄電池充電已經完成，這時可以切斷充電器電源，取下蓄電池。
4。充電機要防止在通風較好的地(di)方，便于散(san)熱。