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PC832-001-N PC832-001-N
PC832-001-N PC832-001-N
反激电路中的变压器起着储能元件的作用,可以看作是一对相互耦合的电感.
工作过程:
S开通后,VD处于断态,N1绕组的电流线性增长,电感储能增加;
S关断后,N1绕组的电流被切断,变压器中的磁场能量通过N2绕组和VD向输出端释放.S关断后的电压为:us=Ui+N1*Uo/N2
反激电路的工作模式:
电流连续模式:当S开通时,N2绕组中的电流尚未下降到零.
输出电压关系:Uo/Ui=N2*ton/N1*toff
电流断续模式:S开通前,N2绕组中的电流已经下降到零.
输出电压高于上式的计算值,并随负载减小而升高,在负载为零的极限情况下, ,因此反激电路不应工作于负载开路状态.
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