Calculation method of winding loss in high frequency planar transformer

Abstract

With the application of high frequency power electronic devices, the planar transformer has been widely used in low voltage and high current module power supplies. Under high frequency working conditions, due to the existence of high frequency effects such as skin and proximity effect, the winding losses increase and take a huge part of the total power loss of the planar transformer. And the conventional one-dimensional model, which is currently used for the calculation of flat rectangular winding losses, leads to a considerable error due to the ignorance of the edge effect. Based on the mechanism and electromagnetic theory of high frequency AC winding losses, this paper analyzes the eddy effects in planar magnetic component, and proposes two-dimensional model, which takes the edge effect into consideration. The Finite Element Analysis (FEA) suggest the proposed model a more effective way to calculate the windings losses in planar magnetic component, which provide an effective calculation method for the optimization design and winding loss analysis of high frequency planar magnetic component and other rectangle conductors in high frequency conditions.