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)壓型控(kong)(kong)制(zhi)與(yu)電(dian)(dian)(dian)(dian)流(liu)型控(kong)(kong)制(zhi)是指對反(fan)饋(kui)信(xin)號(hao)(hao)的(de)(de)(de)不同取樣(yang)方法，電(dian)(dian)(dian)(dian)壓型控(kong)(kong)制(zhi)以電(dian)(dian)(dian)(dian)源的(de)(de)(de)輸出(chu)電(dian)(dian)(dian)(dian)壓為(wei)反(fan)饋(kui)信(xin)號(hao)(hao)，該反(fan)饋(kui)信(xin)號(hao)(hao)與(yu)給定值的(de)(de)(de)偏(pian)差經比較器放大后(hou)與(yu)鋸齒(chi)波比較產(chan)生(sheng)控(kong)(kong)制(zhi)脈沖(chong)。而(er)電(dian)(dian)(dian)(dian)流(liu)型控(kong)(kong)制(zhi)是以高頻變(bian)壓器原邊輸出(chu)電(dian)(dian)(dian)(dian)流(liu)為(wei)采樣(yang)反(fan)饋(kui)信(xin)號(hao)(hao)組(zu)(zu)成電(dian)(dian)(dian)(dian)流(liu)閉(bi)環(huan)(huan)(huan)，以電(dian)(dian)(dian)(dian)壓反(fan)饋(kui)信(xin)號(hao)(hao)組(zu)(zu)成電(dian)(dian)(dian)(dian)壓外環(huan)(huan)(huan)，電(dian)(dian)(dian)(dian)壓外環(huan)(huan)(huan)的(de)(de)(de)輸出(chu)偏(pian)差作為(wei)電(dian)(dian)(dian)(dian)流(liu)內環(huan)(huan)(huan)的(de)(de)(de)給定，與(yu)電(dian)(dian)(dian)(dian)流(liu)反(fan)饋(kui)信(xin)號(hao)(hao)比較產(chan)生(sheng)控(kong)(kong)制(zhi)脈沖(chong)，兩種(zhong)控(kong)(kong)制(zhi)方式(shi)的(de)(de)(de)系統結構框(kuang)圖(tu)如圖(tu)1和圖(tu)2所示：

　　兩種(zhong)控制方(fang)式(shi)的實(shi)現原理如圖(tu)3和圖(tu)4所(suo)示：

　　電(dian)壓(ya)型控制將輸出電(dian)壓(ya)與(yu)VR參考電(dian)壓(ya)Vref的偏差信(xin)號e經PI型誤差放(fang)大(da)器處理后與(yu)振(zhen)蕩器產生(sheng)的鋸齒波進行(xing)比較(jiao)，產生(sheng)PWM控制脈沖，其輸出波形如(ru)圖(tu)5所示。

　　電流型控制有兩(liang)個閉環通道(dao)，電壓與VR參(can)考電壓Vref的偏差(cha)信號e經(jing)PI型誤(wu)差(cha)放大器得以電壓Ve，該電壓與開關管漏極輸出電流進行比較，產生PWM控制脈沖，其輸出波(bo)形(xing)如圖6所示。