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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)限壓(ya)(ya)(ya)(ya)大(da)功(gong)率(lv)蓄電(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)機(ji)可(ke)以(yi)對48伏以(yi)下的(de)蓄電(dian)(dian)(dian)(dian)(dian)池(chi)進行快速全自動充(chong)電(dian)(dian)(dian)(dian)(dian),充(chong)電(dian)(dian)(dian)(dian)(dian)功(gong)率(lv)最大(da)可(ke)以(yi)達(da)到600瓦。STK702-015是一片功(gong)能強(qiang)大(da)的(de)大(da)規模(mo)厚(hou)膜開(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu),內含(han)輔助(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)源(yuan)、PWM控(kong)制(zhi)、輸(shu)出驅動電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)、功(gong)率(lv)場效應管輸(shu)出電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)等。它和(he)簡單而且專用的(de)外圍電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)一起組成性(xing)能可(ke)靠(kao)的(de)開(kai)關(guan)穩壓(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)。交流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)通過(guo)電(dian)(dian)(dian)(dian)(dian)源(yuan)濾(lv)波(bo)(bo)器后(hou)(hou)分(fen)成兩路(lu)(lu):一路(lu)(lu)經整流(liu)(liu)濾(lv)波(bo)(bo)后(hou)(hou)供給(gei)PWM脈寬控(kong)制(zhi)驅動模(mo)塊(kuai)STK702-015的(de)31、32腳(jiao),內部PWM開(kai)始(shi)工(gong)作,產生70KHZ的(de)開(kai)關(guan)信號并驅動功(gong)率(lv)場效應管作強(qiang)勁的(de)D類放大(da)后(hou)(hou)由(you)25、26腳(jiao)輸(shu)出,經過(guo)特殊的(de)LC電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)推動高(gao)頻(pin)變壓(ya)(ya)(ya)(ya)器工(gong)作,經次級降(jiang)壓(ya)(ya)(ya)(ya)后(hou)(hou)由(you)快恢(hui)復(fu)二極管MOR3040PT半波(bo)(bo)整流(liu)(liu)后(hou)(hou)輸(shu)出,這(zhe)(zhe)里沒有濾(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)(dian)容,這(zhe)(zhe)和(he)普通的(de)開(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)有些區別(bie),理論(lun)和(he)實踐告訴我們:脈動直(zhi)流(liu)(liu)比平滑的(de)直(zhi)流(liu)(liu)對蓄電(dian)(dian)(dian)(dian)(dian)池(chi)的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)效果(guo)更好,而本機(ji)的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)脈沖(chong)頻(pin)率(lv)高(gao)達(da)70KHZ,所以(yi)充(chong)電(dian)(dian)(dian)(dian)(dian)效果(guo)更好,充(chong)電(dian)(dian)(dian)(dian)(dian)速度更快。300伏直(zhi)流(liu)(liu)另一路(lu)(lu)向輔助(zhu)(zhu)開(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)供電(dian)(dian)(dian)(dian)(dian),輔助(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)出的(de)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)通過(guo)一個(ge)開(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)后(hou)(hou)給(gei)PWM脈寬控(kong)制(zhi)驅動模(mo)塊(kuai)提供直(zhi)流(liu)(liu)工(gong)作電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(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(shang)海施能(neng)電器設備(bei)有限公司始建于(yu)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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