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)(jin)行恒流快速充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)，充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流可以(yi)根據蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)(de)(de)具(ju)體(ti)容(rong)量(liang)進(jin)(jin)行設(she)定，本(ben)機可以(yi)輸出20A以(yi)下的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流，隨(sui)著充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)時(shi)間的(de)(de)(de)推移(yi)，蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)逐(zhu)漸(jian)上升，容(rong)量(liang)逐(zhu)漸(jian)充(chong)(chong)(chong)(chong)滿，當(dang)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)壓(ya)達到預(yu)定的(de)(de)(de)端電(dian)(dian)(dian)(dian)(dian)壓(ya)時(shi)，充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)機進(jin)(jin)入恒壓(ya)小電(dian)(dian)(dian)(dian)(dian)流充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)，使蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)(de)(de)容(rong)量(liang)進(jin)(jin)一(yi)步充(chong)(chong)(chong)(chong)滿，而且充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器內(nei)部的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)比較器輸出指示信號，綠(lv)色發(fa)光二(er)極管點亮，在進(jin)(jin)行一(yi)段時(shi)間充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)后，充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)過程可以(yi)結束，本(ben)機可以(yi)對48伏以(yi)下的(de)(de)(de)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)進(jin)(jin)行快速全自動充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)，充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)功率最(zui)大可以(yi)達到600瓦，充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器的(de)(de)(de)體(ti)積為200x180x65毫米，重量(liang)約(yue)1公斤。

 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)開始充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)，蓄(xu)(xu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)較低(di)，與充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機的(de)(de)壓(ya)差較大(da)，初(chu)始充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)很大(da)，如果不加以限(xian)制，可能會損壞蓄(xu)(xu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池和充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機，所以本機中由LM358的(de)(de)一(yi)個(ge)(ge)運(yun)放(fang)和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)取樣(yang)(yang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻組成(cheng)一(yi)個(ge)(ge)自動限(xian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路，當(dang)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)超過(guo)設定(ding)的(de)(de)值時(shi)（例如10安培）電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)取樣(yang)(yang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻上的(de)(de)壓(ya)降使LM358的(de)(de)一(yi)個(ge)(ge)運(yun)放(fang)輸出低(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)，控(kong)(kong)制PWM脈寬控(kong)(kong)制驅動模(mo)塊STK702-015輸出的(de)(de)脈沖寬度(du)變窄(zhai)，從而輸出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)降低(di)，充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)減(jian)小。當(dang)蓄(xu)(xu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充滿后(hou)（一(yi)般充滿后(hou)的(de)(de)蓄(xu)(xu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)為標稱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)1.3倍）LM358的(de)(de)另一(yi)個(ge)(ge)運(yun)放(fang)組成(cheng)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)比較器輸出低(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)平(ping)，這時(shi)綠色發光二(er)極管(guan)點亮，同時(shi)切斷(duan)PWM脈寬控(kong)(kong)制驅動模(mo)塊的(de)(de)直流(liu)(liu)(liu)工作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。表示充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)完成(cheng)，此時(shi)的(de)(de)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機只有輔助電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源供電(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(de)地(di)方，便于散熱。