As the critical power component of DC/DC converter

the accuracy of the leakage inductance of the high-frequency transformer has an important effect on the operating mode and control of the converter and the effect is more prominent especially in high frequency operation condition.In view of the calculation of leakage inductance of high-frequency transformers at present

one of the common methods is the magnetic field energy analytic method considering the high frequency effect and the leakage inductance is calculated based on the magnetic field energy.However

the calculation of magnetic field energy is inaccurate due to adoption of the mean turn length scheme in the calculation of magnetic field energy by this method

causing the calculation accuracy of leakage inductance not high enough in the high-frequency copper foil transformer whose turn ratio is not 1.For this purpose

a kind of a leakage inductance calculation method of high-frequency copper foil transformer based on accurate turn length is proposed in this paper.The variation of actual turn length is considered in the radial direction and the energy of the magnetic field is obtained from calculation and then the leakage inductance of transformer is calculated.The method is free from the constrain of turn ratio of transformer and can assure the calculation accuracy of leakage inductance under different turn ratios.Finally

the model simulation is performed based on Ansys and both correctness and effectiveness of the proposed leakage inductance calculation method are verified by the simulation result.