高压平面变压器绕组损耗的建模与评估

The accurate assessment of winding loss is critical for the optimal design of planar transformers. In this study, an improved 1-D model is proposed for calculating winding loss to solve the loss calculation error encountered when designing planar transformers with high insulation voltage. The proposed 1-D enhanced model allows accurate calculation of the horizontal current distribution and winding losses. The accuracy of the model is validated through finite element analysis (FEA) tools. The proposed model is subsequently applied to evaluate the planar winding losses to obtain the optimal design of a high-voltage planar transformer. Special winding structures, such as partial interleaving and unequal-width printed circuit board (PCB) winding, are used to maximize the insulation potential of the PCB. A prototype is implemented with a power density of 14 kW/L and an insulation voltage of 10 kV. The winding loss is reduced by 41%, which demonstrates the effectiveness of the optimal design based on the proposed model.