Precise Evaluation of Leakage Inductance of High-Frequency Transformer

Abstract

Leakage inductance is a key parameter of high-frequency transformers because it directly determines the maximum transmission power of dual active bridge DC-DC converters using phase shift control. Precise control of leakage inductance is essential for the design of high-frequency transformers. This paper provides an analytical method that can evaluate the magnetic energy including the interturn magnetic energy by dividing the winding into linear area and circular area. The method is verified by a FEM model based on weighted algorithm and the results show that it can accurately evaluate the leakage inductance of high-frequency transformer.