2.直流电压U和直流电流的计算 2U, sin ot0≤t≤兀 丌<Ot<2 2π3π4 t 2丌 u d(at) 2丌 √2U2siot(o) 2 4 02mJ0 U。=0.45U7 23π4π D 0.45 R L :5S:352.直流电压Uo和直流电流Io的计算 2 2 sin 0 0 2 o U t t u t          =      2 0 1 ( ) 2 U u d t o o    =  2 0 2 2 1 2 sin ( ) 2 2 0.45 o o U U td t U U U      = = =  π 2π 3π 4πωt u2 uo π 2π 3π 4π ωt uo 2 π 2π 3π 4π ωt 0.45 o o D L L U U I I R R = = =