Analysis of Effect of Winding Interleaving on Leakage Inductance and Winding Loss of High Frequency Transformers

This work concerns prediction of the effect of winding interleaving used in high frequency transformers on leakage inductance and AC resistance. Although the reduction of the leakage inductance and AC resistance by applying interleaving has been well known by most designers, it is difficult to foresee the electrical performance of the transformer in the design stage. Based on the one-dimensional model for windings of magnetic components, this study presents a frequency dependent analytical method for leakage inductance and winding loss, which is suitable for no interleaving and interleaving winding configurations. Several high frequency transformer models with distinct winding arrangements are built, and the validity of the proposed method is verified by comparing the FEM simulation and measurement. Other analytical methods are also compared with this new method. Results show that this method is more reliable and accurate as compared to the other analytical methods. The interleaving provides significant advantage in reducing the leakage inductance and winding loss.