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Typically, the efficiency of the switching converter are varing with load current. At light loac current, the efficiency is poor. But at higher load current, the efficenecy is improving. Finally, when approaching the maximum load current, the efficency is getting poor again. Does anyone tell me the reason for this? And, could anyone tell me how to calculate the conduction and switching loss in the swithcing converters? And any references/paper suggested? Thanks.