正激变换器脉冲变压器的优化设计

以正激变换器为例讨论了电路拓扑（磁复位绕组电路和有源箝位电路）和铁心材料（铁氧体，超微晶）两个因素对变压器体积，重量和损耗的影响。研究结果表明，有源箍位正激变换器对正激变压器体积的减小，重量的减轻和效率的提高有着明显的作用。超微晶材料在一定的工作频率范围内可以减小变压器的体积，重量和损耗，是一种优良的新型磁性材料。

Optimum Design of Transformer in Forward Converter

With the development of power electronics, the requirement on high power density of a converter is becoming more and more important. The power transformer is one of the most important parts in a converter because of the effect on the efficiency, size and weight of the whole converter. This paper, on the base of the forward circuit, discusses the effects of the circuit topology and material of magnetic core on the efficiency, size and weight of the power transformer. The result shows that active-clamped forward circuit not only reduce the volume and weight of the power transformer, but also improve the efficiency of that in a certain range of operation frequency. The performance of super nano-crystal is better than of that it ferrite on the reduction of volume and increase of the efficiency of the power transformer. Super nano-crystal is a kind of new magnetic materials.