1 引言过去10年,电源拓扑发生了翻天覆地的改变。现在的电源都不再需要笨重的50/60Hz的变压器。在传统电源中,这些变压器占体积和重量的主要部分。现在取而代之的是轻巧的变压器,其磁芯是烧结铁氧体,而不是硅钢片,因此工作频率可达到250kHz。相同的功率等级,高开关频率可明显减小变压器的重 1 Introduction The power topology has undergone tremendous changes over the past decade. Now the power is no longer need bulky 50 / 60Hz transformer. In traditional power supplies, these transformers account for the bulk and weight of the main part. Now replaced by lightweight transformers, the core is sintered ferrite, rather than silicon steel, so the operating frequency up to 250kHz. The same power level, high switching frequency can significantly reduce the transformer weight