[問題] 雙埠電路Y參數
____^^^^______V_______^^^^_________
1 | S
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V1 =1/S V2
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如圖電路 V1 I1 V2 I2 如常見定義 中間電壓設V
欲寫成 I1 = Y11 V1 + Y12 V2
I2 = Y21 V1 + Y22 V2
做法1.
左邊: V1 = I1 + (I1+I2)/S
右邊: V1 = I2S + (I1+I2)/S
[V1] = [(S+1)/S 1/S ] [I1] = [Z][I1]
[V2] [1/S (S^2+1)/S] [I2] [I2]
[Y] = [Z]^-1 = 1/(S^2+S+1) [S^+1 1 ]
[ 1 S+1]
做法2.
(V1-V)/1 + (V2-V)/S = VS => V = (SV1 + V2)/(2S+1)
I1 = (V1-V)/1 = [(S+1)/(2S+1)] V1 + [- 1/(2S+1)] V2
I2 = (V2-V)/S = [-1/(2S+1) ] V1 + [ 2 /(2S+1)] V2
請問這兩種做法為什麼算出來的Y參數會不一樣？
哪一種出錯了 為什麼錯了
謝謝
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