电路如图所示,其中
S闭合前,iL1 = Us2/R2 = 6/6 = 1A;
S闭合后,戴维宁等效电压 U = Us1 - UR1 = Us1 - [ ( Us1 - Us2 )R1/(R1+R2) ] = 33/2 v;
等效电阻 R = R1//R2 = 3/2 Ω ;τ = L/r = 0.15 * 2/3 = 0.1;
S闭合后,iL(t) = ( U/R - iL1 )[ 1 - e^(-t/τ) ] + iL1
= [ (33/2)/(3/2) - 1 ][ 1 - e^(-10t) ] + 1 = 10[ 1 - e^(-10t) ] + 1 A 。
t = 3~5τ,iL = 11A,进入稳态 。
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