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)(dian)壓(ya)(ya)(ya)型控(kong)(kong)制(zhi)與電(dian)(dian)(dian)(dian)流型控(kong)(kong)制(zhi)是指(zhi)對反(fan)(fan)饋(kui)信(xin)(xin)號(hao)(hao)的(de)不同(tong)取樣方(fang)法(fa)，電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)型控(kong)(kong)制(zhi)以(yi)電(dian)(dian)(dian)(dian)源的(de)輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)為反(fan)(fan)饋(kui)信(xin)(xin)號(hao)(hao)，該反(fan)(fan)饋(kui)信(xin)(xin)號(hao)(hao)與給(gei)定(ding)值的(de)偏差(cha)經比(bi)(bi)較(jiao)器(qi)放大后與鋸齒波比(bi)(bi)較(jiao)產生控(kong)(kong)制(zhi)脈沖。而電(dian)(dian)(dian)(dian)流型控(kong)(kong)制(zhi)是以(yi)高頻變壓(ya)(ya)(ya)器(qi)原(yuan)邊輸(shu)出電(dian)(dian)(dian)(dian)流為采樣反(fan)(fan)饋(kui)信(xin)(xin)號(hao)(hao)組成電(dian)(dian)(dian)(dian)流閉環，以(yi)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)反(fan)(fan)饋(kui)信(xin)(xin)號(hao)(hao)組成電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)外環，電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)外環的(de)輸(shu)出偏差(cha)作為電(dian)(dian)(dian)(dian)流內環的(de)給(gei)定(ding)，與電(dian)(dian)(dian)(dian)流反(fan)(fan)饋(kui)信(xin)(xin)號(hao)(hao)比(bi)(bi)較(jiao)產生控(kong)(kong)制(zhi)脈沖，兩種(zhong)控(kong)(kong)制(zhi)方(fang)式(shi)的(de)系統(tong)結構框(kuang)圖(tu)如(ru)圖(tu)1和圖(tu)2所(suo)示：

　　兩種(zhong)控制方式的(de)實現原理如(ru)圖3和圖4所(suo)示：

　　電壓型控(kong)制(zhi)將輸(shu)出電壓與VR參考電壓Vref的偏差(cha)信號e經PI型誤差(cha)放大器(qi)處理后與振蕩器(qi)產(chan)生的鋸齒波進行比較(jiao)，產(chan)生PWM控(kong)制(zhi)脈沖，其輸(shu)出波形如(ru)圖5所示。

　　電(dian)流型控(kong)制(zhi)有(you)兩個(ge)閉環通道，電(dian)壓與(yu)VR參考電(dian)壓Vref的偏(pian)差信號e經PI型誤差放大器得以電(dian)壓Ve，該電(dian)壓與(yu)開(kai)關管漏極輸出電(dian)流進行比較，產生PWM控(kong)制(zhi)脈沖(chong)，其輸出波形如圖6所(suo)示。