输出电压平均值(U),输出电流平均值(L): D D L 2 RL ot 0 02兀 2丌 d(at 2u. sina tdat 2丌·0 2x0 2U =0.45U 10=UL=.45U2/RL8 输出电压平均值（Uo）,输出电流平均值（Io )： ( )  =    2 0 2 1 U u d t o o = ( )     0 2 1 sin td t 2U2 =  2 2 0.45 2 U U = u1 u2 a T b D RL uo uD io Io= Uo /RL =0.45 U2 / RL uo 0  2 t