PCB平面电感的损耗分析

Loss Analysis of PCB Planar Inductor

PCB平面电感广泛应用于开关电源中,但其损耗及发热问题对电源性能影响很大。利用Maxwell 3D软件研究了气隙及绕组的位置对PCB平面电感损耗的影响。首先,对平面电感进行了损耗分析,建立平面电感的三维模型;然后,利用Maxwell 3D软件研究了气隙及绕组位置对绕组损耗的影响;最后,利用ANSYS Icepak软件对PCB平面电感进行了热仿真验证。仿真结果表明:当绕组距气隙较近时,EE型磁芯的绕组损耗小于EI型磁芯的绕组损耗;当绕组距气隙的距离较远时,EE型磁芯与EI型磁芯的绕组损耗几乎一致;三个磁芯柱上垫气隙的方式相比中柱磨气隙的方式,绕组损耗明显更小。

PCB planar inductor is widely used in switching power supply,but its loss and heating problems have a great impact on power supply performance.In this paper,Maxwell 3D software is used to study the influence of air gap and winding position on PCB planar inductor loss.Firstly,the loss of planar inductor is analyzed,and the three-dimensional model of planar inductor is established.Then,the influence of air gap and winding position on winding loss is studied by Maxwell 3D software.Finally,the thermal simulation of PCB planar inductor is carried out by using ANSYS Icepak software.The simulation results show that when the winding is close to the air gap,the winding loss of EE core is less than that of EI core;when the winding is far away from the air gap,the winding loss of EE core is almost the same as that of EI core;the winding loss of three cores is significantly smaller than that of the air gap of the middle column.