变频电源工作原理是什么？
变频电(dian)(dian)(dian)(dian)源(yuan)是将(jiang)(jiang)市电(dian)(dian)(dian)(dian)中的(de)交(jiao)(jiao)流电(dian)(dian)(dian)(dian)经过AC→DC→AC变换， 输(shu)(shu)出为(wei)(wei)纯净(jing)的(de)正弦波(bo)，输(shu)(shu)出频率(lv)和电(dian)(dian)(dian)(dian)压 一(yi)定范围内(nei)可调(diao)。它有别于(yu)(yu)用(yong)(yong)(yong)于(yu)(yu)电(dian)(dian)(dian)(dian)机调(diao)速用(yong)(yong)(yong)的(de)变频调(diao)速控(kong)制器(qi)，也有别于(yu)(yu)普通交(jiao)(jiao)流稳(wen)压电(dian)(dian)(dian)(dian)源(yuan)。理想的(de)交(jiao)(jiao)流电(dian)(dian)(dian)(dian)源(yuan)的(de)特点是频率(lv)稳(wen)定、电(dian)(dian)(dian)(dian)压稳(wen)定、内(nei)阻等(deng)于(yu)(yu)零(ling)、电(dian)(dian)(dian)(dian)压波(bo)形为(wei)(wei)纯正弦波(bo)（无失真(zhen)）。变频电(dian)(dian)(dian)(dian)源(yuan)十分接近于(yu)(yu)理想交(jiao)(jiao)流电(dian)(dian)(dian)(dian)源(yuan)，因此，先进发达国家越来越多地(di)将(jiang)(jiang)变频电(dian)(dian)(dian)(dian)源(yuan)用(yong)(yong)(yong)作标(biao)准供(gong)(gong)电(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)源(yuan)，以便为(wei)(wei)用(yong)(yong)(yong)电(dian)(dian)(dian)(dian)器(qi)提供(gong)(gong)最优良(liang)的(de)供(gong)(gong)电(dian)(dian)(dian)(dian)环境，便于(yu)(yu)客观考核用(yong)(yong)(yong)电(dian)(dian)(dian)(dian)器(qi)的(de)技术(shu)性能。 变频电(dian)(dian)(dian)(dian)源(yuan)主要(yao)有二大种类(lei)：线性放大型和SPWM开关型。
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