直(zhi)流(liu)變(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)24v電(dian)(dian)(dian)(dian)(dian)(dian)源是(shi)將(jiang)市電(dian)(dian)(dian)(dian)(dian)(dian)中的(de)學習(xi)交(jiao)(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)過AC→DC→AC更(geng)換， 輸(shu)(shu)出為(wei)(wei)(wei)純靜的(de)正弦交(jiao)(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)波(bo)，輸(shu)(shu)出幾率(lv)和電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓 一定(ding)程度區(qu)間(jian)內(nei)可(ke)調節。它逐(zhu)(zhu)漸成為(wei)(wei)(wei)用到(dao)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)機直(zhi)流(liu)變(bian)(bian)頻(pin)(pin)(pin)變(bian)(bian)頻(pin)(pin)(pin)調速用的(de)直(zhi)流(liu)變(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)直(zhi)流(liu)變(bian)(bian)頻(pin)(pin)(pin)變(bian)(bian)頻(pin)(pin)(pin)調速調整器(qi)(qi)(qi)，也逐(zhu)(zhu)漸成為(wei)(wei)(wei)高(gao)級交(jiao)(jiao)流(liu)穩壓電(dian)(dian)(dian)(dian)(dian)(dian)源。抱(bao)負的(de)討論(lun)會輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)的(de)性能是(shi)聲音(yin)頻(pin)(pin)(pin)率(lv)固定(ding)、額定(ding)線(xian)電(dian)(dian)(dian)(dian)(dian)(dian)壓固定(ding)、電(dian)(dian)(dian)(dian)(dian)(dian)阻相當(dang)于(yu)(yu)零、額定(ding)線(xian)電(dian)(dian)(dian)(dian)(dian)(dian)壓波(bo)形(xing)(xing)圖為(wei)(wei)(wei)純余弦波(bo)（無失幀）。定(ding)頻(pin)(pin)(pin)輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)著實取決于(yu)(yu)于(yu)(yu)抱(bao)負討論(lun)會輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)，因(yin)，先進的(de)繁榮國(guo)家愈來愈越部分地(di)區(qu)將(jiang)定(ding)頻(pin)(pin)(pin)輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)代(dai)替(ti)標準單位輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)(kai)關(guan)(guan)，方便為(wei)(wei)(wei)配(pei)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)出示(shi)合理性良的(de)輸(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)壞境，方便客觀考核電(dian)(dian)(dian)(dian)(dian)(dian)量器(qi)(qi)(qi)的(de)枝術能。 直(zhi)流(liu)變(bian)(bian)頻(pin)(pin)(pin)空調供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)基本有二大的(de)種類：線(xian)形(xing)(xing)調大型(xing)和SPWM觸點開(kai)(kai)關(guan)(guan)型(xing)。