DIO280

DIO280

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開關(guān)式穩(wěn)壓電源接控制方式分為調(diào)寬式和調(diào)頻式兩種僻跳，在實(shí)際的應(yīng)用中，調(diào)寬式使用得較多胚览，在目前開發(fā)和使用的開關(guān)電源集成電路中茶月，絕大多數(shù)也為脈寬調(diào)制型。因此下面就主要介紹調(diào)寬式開關(guān)穩(wěn)壓電源鹉动。

　　 調(diào)寬式開關(guān)穩(wěn)壓電源的基本原理可參見下圖轧坎。

　　 對(duì)于單極性矩形脈沖來說，其直流平均電壓Uo取決于矩形脈沖的寬度泽示，脈沖越寬缸血，其直流平均電壓值就越高。直流平均電壓Ｕ械筛。可由公式計(jì)算埋哟，

　　 即Uo=Um×T1/T

　　 式中Um為矩形脈沖zui大電壓值笆豁；T為矩形脈沖周期；T1為矩形脈沖寬度赤赊。

　　從上式可以看出闯狱，當(dāng)Um 與T 不變時(shí)，直流平均電壓Uo 將與脈沖寬度T1 成正比抛计。這樣哄孤，只要我們?cè)O(shè)法使脈沖寬度隨穩(wěn)壓電源輸出電壓的增高而變窄，就可以達(dá)到穩(wěn)定電壓的目的嫡澄。

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