圖 1 電壓型控製的原理框圖

 

電流型控製是指將誤差放大器輸出信號與采樣到的電感峰值電流進行比較 . 從cong而er對dui輸shu出chu脈mai衝chong的de占zhan空kong比bi進jin行xing控kong製zhi

，使shi輸shu出chu的de電dian感gan峰feng值zhi電dian流liu隨sui誤wu差cha電dian壓ya變bian化hua而er變bian化hua。電dian流liu控kong製zhi型xing是shi一yi個ge一yi階jie係xi統tong，而er一yi階jie係xi統tong是shi無wu條tiao件jian的de穩wen定ding係xi統tong。是shi在zai傳chuan統tong的de PWM dianyakongzhidejichushang
，zengjiadianliufufankuihuanjie，shiqichengweiyigeshuanghuankongzhixitong，rangdiangandianliubuzaishiyigedulidebianliang
，congershikaiguanbianhuanqideerjiemoxingbianchengleyigeyijiexitong。xinhao。congtu 2 zhongkeyikanchu
，yudanyibihuandedianyakongzhimoshixiangbi，dianliumoshikongzhishishuangbihuankongzhixitong，waihuanyoushuchudianyafankuidianluxingcheng，neihuanyouhuganqicaiyangshuchudiangandianliuxingcheng。zaigaishuanghuankongzhizhong，youdianyawaihuankongzhidianliuneihuan，jineihuandianliuzaimeiyikaiguanzhouqineishangsheng
，zhizhidadaodianyawaihuanshedingdewuchadianyahezhi。dianliuneihuanshishunshikuaisujinxingzhugemaichongbijiaogongzuode
，bingqiejianceshuchudiangandianliudedongtaibianhua
，dianyawaihuanzhifuzekongzhishuchudianya。yincidianliuxingkongzhimoshijuyoubiqidianyaxingkongzhimoshidadeduodedaikuan。

 

圖 2 電流型控製原理框圖

 

電流型控製模式有不少優點：線性調整率(電壓調整率)非常好;整zheng個ge反fan饋kui電dian路lu變bian成cheng了le一yi階jie電dian路lu
，由you於yu反fan饋kui信xin號hao電dian路lu與yu電dian壓ya型xing相xiang比bi，減jian少shao了le一yi階jie，因yin此ci誤wu差cha放fang大da器qi的de控kong製zhi環huan補bu償chang網wang絡luo得de以yi簡jian化hua，穩wen定ding度du得de以yi提ti高gao並bing且qie改gai善shan了le頻pin響xiang，具ju有you更geng大da的de增zeng益yi帶dai寬kuan乘cheng積ji;具有瞬時峰值電流限流功能;簡化了反饋控製補償網絡、負載限流、磁通平衡等電路的設計，減少了元器件的數量和成本，這對提高開關電源的功率密度
，實現小型化
，模塊化具有重要的意義。

 

當然了也有缺點

，例如占空比大於 50%時係統可能出現不穩定性
，可能會產生次諧波振蕩;另外，在電路拓撲結構選擇上也有局限
，在升壓型和降壓—shengyaxingdianluzhong
，youyuchunengdianganbuzaishuchuduan，cunzaifengzhidianliuyupingjundianliudewucha。duizaoshengmingan，kangzaoshengxingchadengdeng。duiyuzheyangdequedianxianzaiyijingyoulejiejuedefangan
，xiebobuchangshihenbiyaodeyizhongfangfa。