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升壓變壓器是怎樣變換電壓的？

發布日期：2018-11-15 00:00 來源：//ultrarunning.cn 點擊：

變(bian)壓器是根據(ju)電磁(ci)感(gan)應制成的(de)。它由一(yi)個用硅鋼(gang)片(pian)(pian)(或矽鋼(gang)片(pian)(pian))疊成的(de)鐵芯(xin)和繞在鐵芯(xin)上(shang)的(de)兩組線圈(quan)構(gou)成，鐵芯(xin)與(yu)線圈(quan)間彼此(ci)相互絕緣(yuan)，沒(mei)有任(ren)何電的(de)聯(lian)系(xi)。

將(jiang)(jiang)變(bian)壓(ya)器(qi)和電(dian)源(yuan)一側連接的線(xian)圈(quan)叫初(chu)級(ji)線(xian)圈(quan)(或叫原邊(bian))，把變(bian)壓(ya)器(qi)和用電(dian)設(she)備連接的線(xian)圈(quan)叫作次級(ji)線(xian)圈(quan)(或副邊(bian))。當將(jiang)(jiang)變(bian)壓(ya)器(qi)的初(chu)級(ji)線(xian)圈(quan)接到交流電(dian)源(yuan)上時，鐵芯(xin)中就會產(chan)生變(bian)化的磁力線(xian)。

由(you)于次(ci)(ci)級(ji)(ji)線圈(quan)繞在同一(yi)鐵(tie)芯(xin)上(shang)，磁(ci)力(li)線切割次(ci)(ci)級(ji)(ji)線圈(quan)，次(ci)(ci)級(ji)(ji)線圈(quan)上(shang)必(bi)然產生感應電(dian)(dian)動勢，使線圈(quan)兩(liang)端出(chu)現(xian)電(dian)(dian)壓。因(yin)磁(ci)力(li)線是(shi)交變的，所以次(ci)(ci)級(ji)(ji)線圈(quan)的電(dian)(dian)壓也(ye)是(shi)交變的。而且頻率(lv)與電(dian)(dian)源(yuan)頻率(lv)完(wan)全(quan)相同。

經(jing)理(li)論證實，變(bian)壓(ya)器(qi)初級(ji)線(xian)(xian)(xian)(xian)圈(quan)與次(ci)級(ji)線(xian)(xian)(xian)(xian)圈(quan)電壓(ya)比和(he)初級(ji)線(xian)(xian)(xian)(xian)圈(quan)與次(ci)級(ji)線(xian)(xian)(xian)(xian)圈(quan)的匝(za)數(shu)比值(zhi)有關，可用(yong)下式(shi)表示：初級(ji)線(xian)(xian)(xian)(xian)圈(quan)電壓(ya)/次(ci)級(ji)線(xian)(xian)(xian)(xian)圈(quan)電壓(ya)=初級(ji)線(xian)(xian)(xian)(xian)圈(quan)匝(za)數(shu)/次(ci)級(ji)線(xian)(xian)(xian)(xian)圈(quan)匝(za)數(shu) 說明匝(za)數(shu)越多，電壓(ya)就(jiu)越高。因此可以看出，次(ci)級(ji)線(xian)(xian)(xian)(xian)圈(quan)比初級(ji)線(xian)(xian)(xian)(xian)圈(quan)少，就(jiu)是(shi)降壓(ya)變(bian)壓(ya)器(qi)。相反(fan)則為升壓(ya)變(bian)壓(ya)器(qi)。