總有人會對開關電源電壓型控制與電流型控制是什么有不了解，回答的方式也各式各樣，為了澄清相關概念，這里發表一下對這兩個概念的理解。
　　電(dian)(dian)(dian)壓(ya)(ya)(ya)型(xing)控制(zhi)(zhi)與電(dian)(dian)(dian)流型(xing)控制(zhi)(zhi)是(shi)指對(dui)反(fan)(fan)饋信(xin)(xin)(xin)(xin)號(hao)的(de)不(bu)同取樣(yang)方(fang)法(fa)，電(dian)(dian)(dian)壓(ya)(ya)(ya)型(xing)控制(zhi)(zhi)以(yi)(yi)電(dian)(dian)(dian)源的(de)輸出電(dian)(dian)(dian)壓(ya)(ya)(ya)為反(fan)(fan)饋信(xin)(xin)(xin)(xin)號(hao)，該(gai)反(fan)(fan)饋信(xin)(xin)(xin)(xin)號(hao)與給(gei)定(ding)值的(de)偏差(cha)經比較(jiao)器放大后與鋸齒波比較(jiao)產生控制(zhi)(zhi)脈沖。而電(dian)(dian)(dian)流型(xing)控制(zhi)(zhi)是(shi)以(yi)(yi)高頻變(bian)壓(ya)(ya)(ya)器原邊輸出電(dian)(dian)(dian)流為采樣(yang)反(fan)(fan)饋信(xin)(xin)(xin)(xin)號(hao)組(zu)成電(dian)(dian)(dian)流閉環(huan)，以(yi)(yi)電(dian)(dian)(dian)壓(ya)(ya)(ya)反(fan)(fan)饋信(xin)(xin)(xin)(xin)號(hao)組(zu)成電(dian)(dian)(dian)壓(ya)(ya)(ya)外環(huan)，電(dian)(dian)(dian)壓(ya)(ya)(ya)外環(huan)的(de)輸出偏差(cha)作為電(dian)(dian)(dian)流內環(huan)的(de)給(gei)定(ding)，與電(dian)(dian)(dian)流反(fan)(fan)饋信(xin)(xin)(xin)(xin)號(hao)比較(jiao)產生控制(zhi)(zhi)脈沖，兩種控制(zhi)(zhi)方(fang)式的(de)系統結(jie)構(gou)框圖(tu)如圖(tu)1和圖(tu)2所(suo)示：

　　兩種控制方(fang)式的實現原(yuan)理如圖3和(he)圖4所(suo)示(shi)：

　　電(dian)壓型控(kong)制將輸出(chu)電(dian)壓與(yu)VR參考(kao)電(dian)壓Vref的偏差信號(hao)e經PI型誤差放大器處理后與(yu)振蕩器產生的鋸齒波(bo)進行比較，產生PWM控(kong)制脈(mo)沖，其輸出(chu)波(bo)形(xing)如圖(tu)5所示。

　　電(dian)(dian)流型控制(zhi)有兩(liang)個(ge)閉環(huan)通道，電(dian)(dian)壓(ya)(ya)(ya)與VR參(can)考電(dian)(dian)壓(ya)(ya)(ya)Vref的偏差信(xin)號(hao)e經PI型誤(wu)差放大器得以電(dian)(dian)壓(ya)(ya)(ya)Ve，該(gai)電(dian)(dian)壓(ya)(ya)(ya)與開關管漏極輸(shu)出(chu)電(dian)(dian)流進行比較，產生PWM控制(zhi)脈沖，其輸(shu)出(chu)波形如圖6所示(shi)。