CSE P P 2 2)(22.52-125)=5W PL 2_P_125 Eh225=555% 2 (2)当Um=-Uc时每管的损耗最大 1U14U 1420 P on CC=-× =10.1w 2 R L 2丌2R L 2丌28 元 Z 2 =2=×=50% 4 元(22.52 12.5) 5W 2 1 2 2 = − = − = E L C P P P 55.5% 22.52 12.5 2 2 = = = = E L E L P P P P  (2) 当 Uom UCC 时每管的损耗最大  2 = 10.1W 8 4 20 2 4 1 2 1 2 1 2 2 2 2 2  = =  =  =  L  CC L o m L R U R U P 50% 2 4 4 = =  =     