Matrix transformer based on LLC resonant converter topology magnetic integration

Abstract

The invention discloses a matrix transformer based on LLC topology magnetic integration. The matrix transformer comprises a magnetic core and windings arranged on the periphery, the magnetic core (7) further comprises four middle columns (1) and four side columns (2), and the windings further comprise primary windings and secondary windings; the primary windings and the secondary windings are arranged on the peripheries of the middle columns (1) and the side columns (2) to form the transformer; in each middle column (1), two layers of middle column primary windings (3) are arranged on the upper side, and four layers of middle column secondary windings (5) are arranged on the lower side; in each side column (2), two layers of side column primary windings (4) are arranged on the upper side, and four layers of side column secondary windings (6) are arranged on the lower side; air gaps lg1 and lg2 are reserved in the middle column (1) and the side columns (2); and the control of the air gaps lg1 and lg2 brings the mutual decoupling of the leakage inductance and the excitation inductance of the transformer, thereby meeting the requirement of the LLC resonant converter for the inductance ratio during the voltage regulation. The scheme of excitation inductance and leakage inductance decoupling control is achieved.

Description

technical field [0001] The invention relates to the field of DC-DC converters and resonant converters, in particular to a matrix transformer. Background technique [0002] The LLC resonant converter has easy-to-implement soft switching characteristics and good magnetic integration characteristics, and can realize high-efficiency and wide-range adjustment of the output voltage in a narrow frequency range, so it is widely used in DC-DC step-down applications, such as micro Power grids, electric vehicles, and data centers, among others. At present, it is a common practice to use the excitation inductance of the transformer to replace the parallel resonant inductance of the LLC resonant converter, and to control the magnitude of the excitation inductance by adjusting the transformer air gap. In addition, since the output side of the LLC resonant converter usually needs to withstand low voltage and high current, the current stress of the secondary rectifier device can be doubled...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the series resonant inductance of the LLC resonant converter is difficult to integrate with the matrix transformer, this invention proposes a matrix transformer based on LLC topological magnetic integration, using the air gaps of the central magnetic column and side columns to control the excitation inductance and leakage inductance respectively , to meet the requirements of the inductance ratio during voltage regulation of the LLC converter

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