How is the leakage inductance of high-frequency transformer generated?

The leakage inductance of high-frequency transformers is caused by imperfect coupling between windings and discontinuous magnetic flux in the core. The following are some contents about the causes of leakage inductance of high-frequency transformers:

Imperfect coupling between windings: There are certain coupling resistances and capacitances between the windings of high-frequency transformers. These coupling elements will lead to incomplete energy transfer between windings, resulting in leakage inductance.

Discontinuity of magnetic flux in the magnetic core: The magnetic core of a high-frequency transformer is composed of multiple magnetic circuits. If the magnetic flux distribution in the magnetic core is uneven or there are defects such as air gaps, it will cause discontinuity in the magnetic flux, resulting in leakage inductance.

Distributed capacitance of windings: There is a certain distributed capacitance in the windings of high-frequency transformers. These capacitances will interact with the surrounding electric field under high-frequency conditions, thereby producing leakage inductance.

Distance between windings: A certain distance needs to be maintained between the windings of high-frequency transformers to avoid excessive coupling and interference. If the distance between the windings is too small, the coupling between the windings will increase, resulting in leakage inductance.

Influence of manufacturing process: The manufacturing process of high-frequency transformer will also affect its leakage inductance. For example, the arrangement and fixation of the windings, the assembly and fastening of the magnetic core, etc. may affect the degree of leakage inductance.

In short, the leakage inductance of high-frequency transformers is caused by imperfect coupling between windings and discontinuous magnetic flux in the core. In order to reduce the leakage inductance of high-frequency transformers, measures such as optimizing winding design, selecting appropriate core materials, and improving manufacturing processes can be taken to improve the performance and reliability of the transformer.