Optimal Design of Transformer Windings for Full-Bridge LLC Resonant Converters

Abstract

High frequency is the development trend of switching power supplies to achieve miniaturization density of switching power supplies. However, the increase in frequency makes the leakage inductance parameter of the transformer in the switching power supply more and more important to the performance of the circuit. In this paper, the leakage inductance and winding loss of high frequency transformer in LLC resonant converter are analyzed in detail. An optimized design scheme of high frequency transformer based on winding structure is introduced, which can effectively reduce the leakage inductance and winding losses of high frequency transformer, and improve stability and efficiency of the transformer resonant converter. Finite-element analysis simulation validate the design scheme.