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手提燈全自動充電器

    用6V免維護電瓶供電的應急手提燈在農村應用非常廣泛,其配用的充電器是一個變壓(ya)器(qi)降壓(ya)、單二極管(guan)半波整流裝置(zhi),充電(dian)時間很難掌握。由于電(dian)池虧電(dian)或(huo)過充電(dian)往(wang)往(wang)會造(zao)成電(dian)池壽(shou)命縮(suo)短,本人(ren)設計(ji)制(zhi)作了一個簡易自(zi)動充電(dian)裝置(zhi),可(ke)有效(xiao)延(yan)長電(dian)池壽(shou)命。

        元件選用與制(zhi)作

  T1可(ke)使(shi)用(yong)10VA左右(you),次級(ji)有9V和12V輸出(chu)的電(dian)(dian)源變壓(ya)器(qi)(qi),若使(shi)用(yong)原配(pei)變壓(ya)器(qi)(qi)(次級(ji)輸出(chu)9V)時,繼(ji)(ji)電(dian)(dian)器(qi)(qi)K1工作電(dian)(dian)壓(ya)也應選9V。繼(ji)(ji)電(dian)(dian)器(qi)(qi)選用(yong)4088、4089、JRX-13F等12V繼(ji)(ji)電(dian)(dian)器(qi)(qi)。VT使(shi)用(yong)9013、9014、8050等小功(gong)率晶體管,要(yao)(yao)求穿透(tou)電(dian)(dian)流要(yao)(yao)小,開關(guan)特性(xing)好,β=100~1500光(guang)耦合器(qi)(qi)IC可(ke)用(yong)4N23、4N25、4N33等型號。C1的耐(nai)壓(ya)不得小于450V,容量取(qu)220nF~470nF,容量越(yue)大(da),LED1越(yue)亮。調(diao)試時,先斷開VD2,在X1、X2兩(liang)端加7.5V直流電(dian)(dian)壓(ya),從大(da)到小調(diao)電(dian)(dian)位器(qi)(qi)RP,使(shi)4N250⑤腳電(dian)(dian)位突然下(xia)降(K1釋放)即可(ke)。

  工作原理

  電路如圖1所示。GB為待充電電池,平時只要不再使用,就將充電器插頭X1、X2插入手提燈的充電插孔內。按一下啟動按鈕SB,220V交流市電經保險Fu、SB加在電源變壓器T1初級。其次級輸出兩路交流電壓:交流12V經VD1半波整流、C2平滑濾波,使VT導通。繼電器K1吸合,K1-1閉合。此時松手使SB斷開后,充電器仍(reng)然工作。圖中,R2是VT的偏置電(dian)阻(zu);C1是降壓(ya)電(dian)容,LED1(紅)為市電(dian)電(dian)源(yuan)指(zhi)示(shi)管;啟動(dong)完(wan)成后,交流9V電(dian)壓(ya)經VD2整流為電(dian)瓶GB充(chong)電(dian),LED2(綠(lv))為充(chong)電(dian)指(zhi)示(shi)管。隨著充(chong)電(dian)過程的進(jin)行,電(dian)瓶兩(liang)端電(dian)壓(ya)不斷上升,當(dang)升至(zhi)極(ji)限(xian)電(dian)壓(ya)值(zhi)(約(yue)(yue)7.5V)時,穩壓(ya)管VD3反向擊穿導通(tong),光(guang)(guang)耦(ou)合器4N25①、②腳(jiao)內發(fa)光(guang)(guang)二極(ji)管發(fa)光(guang)(guang),④、⑤腳(jiao)內光(guang)(guang)電(dian)管受光(guang)(guang)后隨之導通(tong),VT基極(ji)被下拉(la)(約(yue)(yue)0V)而失去正(zheng)偏壓(ya),所(suo)以(yi)VT截止,K1釋放使K1-1斷開,停止充(chong)電(dian),充(chong)電(dian)指(zhi)示(shi)管LED2熄(xi)滅。

  

手提燈全自動充電器的制作
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