3.14双口网络互联 1、级联 b u u N b u 1b u b b
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
a b uib b A11A12 L!2 A21A22 z2 u1 ula Aula al u2a A2la A2 Aula a u1b Aug Al Alb A12b)r u2b A 22a l1b A2la A22a jl a21b A 126 A 12a Alb A12b)c 12 A2la a 22a A21b422b 2
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 −
L!1 Alla A12a) r A11b Ar 12 A A A2 1b A22b AuA Aula d Alb A12b 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
2、串联 a 1b 2b b Nb b 2a i u a 1b 2b lb b 2b
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 1b 2b 1 RI R12 iI u1b 12 R21R22 2b z1 ula u1b R R Rib R12b i1b u2 2 u2b R2la R22a[i2a LR216 R22bLi2b Rila ri Rib RI L1 Rela r R21b R22b R1R12 R1laR12a「RbR12b R21R22 Rela r22a +R21b R22b
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