In order to fulfill the precise control of leakage inductance of a high-frequency high-voltage transformer

a leakage inductance design method is proposed by combining finite element analysis and winding segmentation concept. Firstly

the low-voltage windings are divided into several segments

of which the equivalent leakage magnetic circuits can be established with lumped parameters. By analogizing the line axiom in plane geometry

a hypothesis is given that the leakage magnetic reluctances can be seen as constant during the adjustment of the turns of each segment winding. Secondly

the relationship between the leakage inductance and the turns of each segment and the leakage inductances of 2 or 3 given special cases are derived. Thirdly

the leakage inductances under the special cases mentioned above are acquired by finite element simulations. Finally

the low-voltage windings with two segments are taken as an example to study various situations consisting of three layouts and four air gaps

and the finite element simulation results are compared with the calculation results by the proposed method. The results show that the relative errors of leakage inductances are all within an acceptable range under different layout and air gap combinations. In addition

during the leakage inductance adjustment process

the variation of the magnetizing inductance is negligble

which further verifies the effectiveness and applicability of this design method.