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輸出過壓保護電路的原理圖

發布日期:2022-04-17 點擊率:84

輸出過壓保護電路的原理圖

輸出過壓保護電路的原理圖如下所示:

 
輸出過壓保護電路的作用是:當輸出電壓超過設計值時,把輸出電壓限定在一安全值的范圍內。當開關電源內部穩壓環路出現故障或者由于用戶操作不當引起輸出過壓現象時,過壓保護電路進行保護以防止損壞后級用電設備。應用最為普遍的過壓保護電路有如下幾種:

可控硅觸發保護電路

如上圖,當Uo1輸出升高,穩壓管(Z3)擊穿導通,可控硅(SCR1)的控制端得到觸發電壓,因此可控硅導通。Uo2電壓對地短路,過流保護電路或短路保護電路就會工作,停止整個電源電路的工作。當輸出過壓現象排除,可控硅的控制端觸發電壓通過R對地泄放,可控硅恢復斷開狀態。

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