PC832-001-N PC832-001-N
PC832-001-N PC832-001-N
反激電路中的變壓器起著儲能元件的作用,可以看作是一對相互耦合的電感.
工作過程:
S開通后,VD處于斷態(tài),N1繞組的電流線性增長,電感儲能增加;
S關(guān)斷后,N1繞組的電流被切斷,變壓器中的磁場能量通過N2繞組和VD向輸出端釋放.S關(guān)斷后的電壓為:us=Ui+N1*Uo/N2
反激電路的工作模式:
電流連續(xù)模式:當(dāng)S開通時,N2繞組中的電流尚未下降到零.
輸出電壓關(guān)系:Uo/Ui=N2*ton/N1*toff
電流斷續(xù)模式:S開通前,N2繞組中的電流已經(jīng)下降到零.
輸出電壓高于上式的計算值,并隨負(fù)載減小而升高,在負(fù)載為零的極限情況下, ,因此反激電路不應(yīng)工作于負(fù)載開路狀態(tài).
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