變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)是(shi)將市(shi)電(dian)(dian)(dian)(dian)(dian)(dian)中的(de)(de)交流電(dian)(dian)(dian)(dian)(dian)(dian)經過AC→DC→AC變(bian)換， 輸出(chu)為(wei)純凈的(de)(de)正弦波(bo)，輸出(chu)頻(pin)(pin)率和(he)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya) 一定(ding)范圍內可調。它有(you)(you)別(bie)于(yu)用于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)調速用的(de)(de)變(bian)頻(pin)(pin)調速控制器(qi)，也有(you)(you)別(bie)于(yu)普(pu)通交流穩壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)。理想(xiang)的(de)(de)交流電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的(de)(de)特點(dian)是(shi)頻(pin)(pin)率穩定(ding)、電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)穩定(ding)、內阻等于(yu)零、電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)波(bo)形為(wei)純正弦波(bo)(無失真)。變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)十分接近于(yu)理想(xiang)交流電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)，因此，先(xian)進發達國家(jia)越來越多地將變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)用作標準供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)，以便(bian)為(wei)用電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)提供(gong)最優良的(de)(de)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)環境(jing)，便(bian)于(yu)客觀(guan)考核用電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)的(de)(de)技(ji)術性能。 變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)主(zhu)要有(you)(you)二大種類:線性放大型(xing)(xing)和(he)SPWM開關型(xing)(xing)。
