48伏以下的蓄電池進行快速全自動充電機的工作原理
2019/4/16 9:16:25??????點擊：
本(ben)機(ji)可以(yi)對(dui)48伏以(yi)下(xia)的(de)蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)進行(xing)快速(su)全自動充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)功(gong)(gong)率(lv)最(zui)大(da)(da)可以(yi)達到600瓦。STK702-015是一片(pian)功(gong)(gong)能強大(da)(da)的(de)大(da)(da)規模(mo)厚膜開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，內含輔助電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)、PWM控制、輸(shu)出驅動電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、功(gong)(gong)率(lv)場(chang)效(xiao)應(ying)管(guan)輸(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)等(deng)。它(ta)和(he)(he)簡(jian)單(dan)而且專用的(de)外圍電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)一起組成性能可靠(kao)的(de)開(kai)關穩壓電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)。交流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)通(tong)過電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)濾波(bo)器后(hou)(hou)(hou)(hou)分成兩(liang)路(lu)：一路(lu)經整流(liu)(liu)濾波(bo)后(hou)(hou)(hou)(hou)供給(gei)PWM脈寬控制驅動模(mo)塊(kuai)STK702-015的(de)31、32腳，內部PWM開(kai)始工作(zuo)，產(chan)生70KHZ的(de)開(kai)關信號(hao)并驅動功(gong)(gong)率(lv)場(chang)效(xiao)應(ying)管(guan)作(zuo)強勁的(de)D類放大(da)(da)后(hou)(hou)(hou)(hou)由(you)25、26腳輸(shu)出，經過特殊的(de)LC電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)推(tui)動高頻變壓器工作(zuo)，經次級(ji)降壓后(hou)(hou)(hou)(hou)由(you)快恢復二(er)極管(guan)MOR3040PT半波(bo)整流(liu)(liu)后(hou)(hou)(hou)(hou)輸(shu)出，這里沒(mei)有濾波(bo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容，這和(he)(he)普通(tong)的(de)開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)有些區別(bie)，理論和(he)(he)實踐告訴我們(men)：脈動直流(liu)(liu)比平滑的(de)直流(liu)(liu)對(dui)蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)效(xiao)果(guo)更(geng)好(hao)，而本(ben)機(ji)的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)脈沖(chong)頻率(lv)高達70KHZ，所以(yi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)效(xiao)果(guo)更(geng)好(hao)，充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)速(su)度更(geng)快。300伏直流(liu)(liu)另(ling)一路(lu)向輔助開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，輔助電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)出的(de)直流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓通(tong)過一個開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)后(hou)(hou)(hou)(hou)給(gei)PWM脈寬控制驅動模(mo)塊(kuai)提供直流(liu)(liu)工作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓。
當開始充電時，蓄電池的電壓較低，與充電機的壓差較大，初始充電電流很大，如果不加以限制，可能會損壞蓄電池和充電機，所以本機中由LM358的一個運放和電流取樣電阻組成一個自動限流電路，當充電電流超過設定的值時（例如10安培）電流取樣電阻上的壓降使LM358的一個運放輸出低電平，控制PWM脈寬控制驅動模塊STK702-015輸出的脈沖寬度變窄，從而輸出電壓降低，充電電流減小。當蓄電池充滿后（一般充滿后的蓄電池電壓為標稱電壓的1.3倍）LM358的另一個運放組成的電壓比較器輸出低電平，這時綠色發光二極管點亮，同時切斷PWM脈寬控制驅動模塊的直流工作電壓。表示充電完成，此時的充電機只有輔助電源供電，功耗很小。上海施(shi)能電器(qi)設(she)備有限公(gong)司始建于1984年，上海市高新技術企業，中國工業車輛優秀配套供應商，上海電器行業名優產品，主要生產工頻系列充電機，高頻系列充電機，鋰電池充電機，系列放電機，系列充放電機等電器產品。
當開始充電時，蓄電池的電壓較低，與充電機的壓差較大，初始充電電流很大，如果不加以限制，可能會損壞蓄電池和充電機，所以本機中由LM358的一個運放和電流取樣電阻組成一個自動限流電路，當充電電流超過設定的值時（例如10安培）電流取樣電阻上的壓降使LM358的一個運放輸出低電平，控制PWM脈寬控制驅動模塊STK702-015輸出的脈沖寬度變窄，從而輸出電壓降低，充電電流減小。當蓄電池充滿后（一般充滿后的蓄電池電壓為標稱電壓的1.3倍）LM358的另一個運放組成的電壓比較器輸出低電平，這時綠色發光二極管點亮，同時切斷PWM脈寬控制驅動模塊的直流工作電壓。表示充電完成，此時的充電機只有輔助電源供電，功耗很小。上海施(shi)能電器(qi)設(she)備有限公(gong)司始建于1984年，上海市高新技術企業，中國工業車輛優秀配套供應商，上海電器行業名優產品，主要生產工頻系列充電機，高頻系列充電機，鋰電池充電機，系列放電機，系列充放電機等電器產品。
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