r=RC=100×50×106=0.005 Rp =0 C (0)-(0.)e 0+(0.5-0)e 200t 0.5e 200t R 0+(50-0)e 200t 50e 闪四 西南交通大学西南交通大学 [ ] t c cp c cp i i i i e t 1 (0 ) (0 ) - + + = + - × e e A 200t 200t 0 (0.5 0) 0.5 - - = + - = [ ] t R Rp R Rp u u u u e t 1 (0 ) (0 ) - + + = + - × e e V 200t 200t 0 (50 0) 50 - - = + - = RC 100 50 10 0.005s 6 = = ´ ´ = - t i cp = 0 uRp = 0