3.14双口网络互联 1、级联 a a 1b 2b u u 1b b la 2a 1b b u u Nh
3.14 双口网络互联 • 1、级联 Na + i1a + i2a u2a u1a Nb + i1b + i2b u1b u2b Na + i1a + i2a u2a u1a Nb + i1b + i2b u1b u2b + u1 + u2 i2 i1
la 1b 2b u u1 a b u21 u1 A11A2 u2 A21A22 l2 u1 uI Aula a u2a A2la A 12a Aula a u1b Au la al Alb A1 u26 l16 A21b4 26 Aub Al 12 A2la a L2
Na + i1a + i2a u2a u1a Nb + i1b + i2b u1b u2b + u1 + u2 i2 i1 21 22 11 12 A A A A = 1 1 i u 2 2 i u − a a a a A A A A 21 22 11 12 = 1 1 i u a a i u 2 2 a − a i u 1 1 = a a a a A A A A 21 22 11 12 b b i u 1 1 = a a a a A A A A 21 22 11 12 = b b b b A A A A 21 22 11 12 b b i u 2 2 − a a a a A A A A 21 22 11 12 = b b b b A A A A 21 22 11 12 2 2 i u −
uI AA A11b A12b u2 A2la A21b A22b A1A12 Aula au 12b A2 1b A22b
a a a a A A A A 21 22 11 12 = b b b b A A A A 21 22 11 12 2 2 i u 1 − 1 i u a a a a A A A A 21 22 11 12 = b b b b A A A A 21 22 11 12 21 22 11 12 A A A A
联 串 a a b b a a b 1b b
2、串联 Na + i1a + i2a u2a u1a Nb + i1b + i2b u1b u2b Na + i1a + i2a u2a u1a Nb + i1b + i2b u1b u2b + u2 + u1 i1 i2
la a u u2 1b 2b R1R12 u u2[R21 R b u L2 2b uia Rila ri Z1 Rib Rib i1b u2 z2 u2b Rela r z2 R21b R z26 Rila r Rub RI l1 Rela r R21b R 2 Ru Ri Rula ru Rub R R21 R Rela r22 R21b R22i
Na + i1a + i2a u2a u1a Nb + i1b + i2b u1b u2b + u2 + u1 i1 i2 2 1 i i 2 1 u u 21 22 11 12 R R R R = = a a u u 2 1 + b b u u 2 1 2 1 u u a a i i 2 1 a a a a R R R R 21 22 11 12 = + b b i i 2 1 b b b b R R R R 21 22 11 12 a a a a R R R R 21 22 11 12 = + 2 1 i i b b b b R R R R 21 22 11 12 a a a a R R R R 21 22 11 12 = + b b b b R R R R 21 22 11 12 21 22 11 12 R R R R