高频平面矩阵变压器优化设计

Optimized Design of High-frequency Planar Matrix Transformer

平面矩阵变压器可通过磁通相抵消的方式提高功率密度并增加通流能力。然而,在高频工作时,磁芯和绕组受高频效应的不利影响,会导致损耗增加,较大的层间寄生电容也会影响变压器的高频性能。针对上述问题,采用磁集成技术对变压器磁芯和绕组进行优化设计,以满足高频工作要求。首先对磁芯形状进行优化设计,以降低磁通密度,减小磁芯损耗;然后综合考虑磁芯与绕组总损耗,对磁柱形状、磁芯尺寸以及绕组布局进行优化设计,以满足变压器总损耗最小;最后,对绕组进行二次优化设计,使得在以减小寄生电容为主要优化方向下的绕组损耗在可接受范围内。通过搭建一台工作频率为1MHz,电压为380V/12V的矩阵变压器来详叙上述优化方法。

Planar matrix transformers can increase power density and current capacity by utilizing magnetic flux cancellation.However,under high-frequency conditions,the magnetic core and winding can lead to increased losses,and large interlayer parasitic capacitance can also affect the performance of the transformer.To address these issues,the magnetic integration technology is used to optimize the design of the transformer.Firstly,the shape of the magnetic core is optimized to reduce core losses.Then,the total loss of magnetic core and winding is considered comprehensively,the shape of the magnetic column,the dimensions of the magnetic core,and the layout of the winding are optimized to minimize the total losses.Finally,a secondary optimization design is performed on the winding to ensure that the winding losses,with a primary focus on reducing parasitic capacitance,are within an acceptable range.The effectiveness of these optimization methods is demonstrated by constructing a planar transformer with a voltage rating of 380 V/12 V and an operating frequency of 1 MHz.