Matrix transformer integrated with adjustable leakage inductance and resonant converter

By introducing a middle layer cover plate into the matrix transformer to form a leakage flux loop and adjusting its structural parameters, the problem of difficult leakage inductance adjustment of the matrix transformer is solved, achieving precise control and magnetic integration of transformer leakage inductance and improving the performance of the converter.

CN120341016BActive Publication Date: 2026-06-26BEIJING INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INST OF TECH
Filing Date
2025-04-17
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing magnetically integrated matrix transformers have very low leakage inductance due to the good coupling performance between the primary and secondary windings, making it difficult to achieve an equivalent replacement of the resonant inductance within the resonant cavity unit, thus affecting the electrical performance of the converter.

Method used

By introducing a middle layer cover plate into the matrix transformer, a leakage flux loop is formed. By adjusting the structural parameters and design conditions of the middle layer cover plate, such as the number of laminations, thickness, material, openings, and planar air gaps, the size of the leakage inductance can be precisely controlled, thereby replacing the resonant inductor and realizing magnetic integration.

Benefits of technology

Precise control of transformer leakage inductance was achieved, improving the power density and core utilization of the matrix transformer and meeting the gain characteristics of the resonant converter under different operating conditions.

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Abstract

The application discloses a matrix transformer integrated with adjustable leakage inductance and a resonant converter, and relates to the technical field of power electronics. The matrix transformer comprises upper, middle and lower cover plates, a plurality of magnetic columns, a primary winding and a secondary winding. The magnetic columns are arranged between the upper and lower cover plates, and each of the magnetic columns is provided with an air gap. The middle cover plate is arranged between the upper and lower cover plates and penetrates through each air gap. The primary winding is wound on the magnetic column close to the upper cover plate, and the secondary winding is wound on the magnetic column close to the lower cover plate. After being electrified, the magnetic field generated by the primary current excitation passes through the upper cover plate-magnetic column-lower cover plate-magnetic column-upper cover plate to form a main magnetic flux loop, and passes through the upper cover plate-magnetic column-middle cover plate-magnetic column-upper cover plate to form a leakage magnetic flux loop. The size of the leakage inductance of the leakage magnetic flux loop is adjusted by adjusting the structural parameters and design conditions of the middle cover plate. The application realizes accurate control of the size of the leakage inductance of the transformer and integration of the resonant inductance and the transformer.
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