恒流限壓大功率蓄電池充電機方案
2019/4/3 9:04:57??????點擊:
恒流(liu)(liu)(liu)限壓(ya)大功(gong)(gong)率蓄電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)機可以(yi)對(dui)48伏以(yi)下的(de)蓄電(dian)(dian)(dian)(dian)(dian)池進行快速(su)全自動充電(dian)(dian)(dian)(dian)(dian),充電(dian)(dian)(dian)(dian)(dian)功(gong)(gong)率最(zui)大可以(yi)達到600瓦。STK702-015是(shi)一(yi)(yi)片功(gong)(gong)能強大的(de)大規模(mo)厚膜開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu),內含輔助電(dian)(dian)(dian)(dian)(dian)源(yuan)、PWM控(kong)制、輸(shu)出(chu)驅(qu)動電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)、功(gong)(gong)率場效應管輸(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)等。它和簡單而(er)且(qie)專(zhuan)用(yong)的(de)外圍電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)一(yi)(yi)起(qi)組(zu)成(cheng)性(xing)能可靠(kao)的(de)開(kai)(kai)關(guan)穩壓(ya)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)。交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)通(tong)過(guo)電(dian)(dian)(dian)(dian)(dian)源(yuan)濾波(bo)(bo)(bo)器(qi)后分(fen)成(cheng)兩路(lu)(lu)(lu)(lu):一(yi)(yi)路(lu)(lu)(lu)(lu)經(jing)(jing)整流(liu)(liu)(liu)濾波(bo)(bo)(bo)后供給(gei)PWM脈寬控(kong)制驅(qu)動模(mo)塊(kuai)STK702-015的(de)31、32腳,內部PWM開(kai)(kai)始工(gong)作(zuo)(zuo),產生70KHZ的(de)開(kai)(kai)關(guan)信號并(bing)驅(qu)動功(gong)(gong)率場效應管作(zuo)(zuo)強勁的(de)D類(lei)放大后由(you)25、26腳輸(shu)出(chu),經(jing)(jing)過(guo)特殊的(de)LC電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)推(tui)動高頻變壓(ya)器(qi)工(gong)作(zuo)(zuo),經(jing)(jing)次級降(jiang)壓(ya)后由(you)快恢復(fu)二極管MOR3040PT半波(bo)(bo)(bo)整流(liu)(liu)(liu)后輸(shu)出(chu),這里沒(mei)有(you)濾波(bo)(bo)(bo)電(dian)(dian)(dian)(dian)(dian)容,這和普(pu)通(tong)的(de)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)有(you)些區別,理論(lun)和實踐告訴我們:脈動直(zhi)流(liu)(liu)(liu)比平(ping)滑的(de)直(zhi)流(liu)(liu)(liu)對(dui)蓄電(dian)(dian)(dian)(dian)(dian)池的(de)充電(dian)(dian)(dian)(dian)(dian)效果更(geng)好,而(er)本機的(de)充電(dian)(dian)(dian)(dian)(dian)脈沖頻率高達70KHZ,所以(yi)充電(dian)(dian)(dian)(dian)(dian)效果更(geng)好,充電(dian)(dian)(dian)(dian)(dian)速(su)度(du)更(geng)快。300伏直(zhi)流(liu)(liu)(liu)另一(yi)(yi)路(lu)(lu)(lu)(lu)向輔助開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)供電(dian)(dian)(dian)(dian)(dian),輔助電(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)出(chu)的(de)直(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)通(tong)過(guo)一(yi)(yi)個開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)后給(gei)PWM脈寬控(kong)制驅(qu)動模(mo)塊(kuai)提供直(zhi)流(liu)(liu)(liu)工(gong)作(zuo)(zuo)電(dian)(dian)(dian)(dian)(dian)壓(ya)。
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。上海施能電器設備(bei)有限公司(si)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。上海施能電器設備(bei)有限公司(si)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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