开关电源高频功率平面变压器串并混联PCB线圈交流损耗模型

并联PCB线圈为高频大电流高功率密度开关电源平面变压器重要线圈结构之一,但其载流能力与线圈的设计、变化多端的连接方式以及工作条件等诸多因素有很大关系,必须通过建立线圈损耗模型才能够进行深入系统分析,并得到较优化的设计结果.基于由并联PCB线圈导体层所构成回路的电压平衡原理,结合涡流场场控方程建立了具有串并混联的长形与环形并联PCB线圈交流损耗解析模型.实验验证了交流损耗模型的正确性,并具有足够高的工程精度.

AC loss modeling for multi-turn parallel PCB winding of high-frequency power planar transformer

Parallel PCB winding is a good solution for high-frequency,high-current and high power density planar transformers of switching-mode power supply.However,the current handling capability of the parallel PCB winding depends on its reasonable design.Uneven current sharing among parallel PCB layers of the winding makes the winding loss model and the design complicated.Comparing to the singleturn parallel PCB windings,the multi-turns or series-and parallel-hybrid connection PCB winding has more complicated loss model and its design.Based on voltage balance of circuit loop consisted by parallel PCB layers,the analytical loss model was built for the multi-turns PCB winding including rectangular-and circular-structure.Experiments verify the loss model.