CN114654868A

CN114654868A - High-power crossed decoupling integrated high-frequency transformer structure

Info

Publication number: CN114654868A
Application number: CN202210336870.0A
Authority: CN
Inventors: 陈德志; 张世崇; 白保东; 曹雄雄; 王阳
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 2021-10-27
Filing date: 2022-04-01
Publication date: 2022-06-24
Also published as: CN113895140A

Abstract

The invention discloses a high-power crossed decoupling integrated ultrahigh frequency transformer structure which comprises a magnetic core middle column, wherein N pairs of magnetic core side columns are arranged outside the magnetic core middle column, N is a positive integer, and the N pairs of magnetic core side columns are circumferentially arranged on the magnetic core middle column; the magnetic core middle column and the magnetic core side column are provided with windings; the magnetic core side column is U-shaped, and two ends of the magnetic core side column are fixed with the magnetic core middle column; and the windings on the symmetrical side columns of the magnetic core are connected. A plurality of transformers are decoupled and integrated on the same magnetic core at the same time, and the work of the transformers is not influenced mutually; the magnetic core material is made of a high-permeability magnetic material. The number of discrete transformers and the occupied space volume of the discrete transformers can be reduced, the volume of a magnetic core can be reduced when the discrete transformers work under ultrahigh frequency, the power density of the power converter adopting the integrated high-frequency transformer is greatly improved, and meanwhile, lead wires among devices can be saved.

Description

High-power crossed decoupling integrated high-frequency transformer structure

Technical Field

The invention relates to the technical field of high-frequency transformers, in particular to a high-power cross-type decoupling integrated high-frequency transformer structure.

Background

In recent years, with the use of new energy and the development of power electronic technology, the number of power converters required by a power supply system is increasing, and the power converters are used for realizing transmission and conversion of electric energy. Power density has been widely studied as an important indicator in power converter systems. The high-power high-frequency transformer is an indispensable element in an isolation power converter and has the functions of transmitting energy and electrically isolating. However, when there are multiple high frequency transformers in the power converter, the space occupied by the transformers is large, resulting in a reduction in power density. Therefore, it is important to integrate multiple transformers into one core using magnetic integration technology and operate at ultra-high frequencies to reduce the number of discrete transformers and the volume of space occupied by the transformers.

Disclosure of Invention

The invention aims to provide a high-power crossed decoupling integrated high-frequency transformer structure, which integrates a plurality of transformers on one magnetic core by adopting a magnetic integration technology so as to reduce the number of discrete transformers and the occupied space volume of the discrete transformers.

In order to achieve the purpose, the invention provides the following technical scheme: a high-power crossed decoupling integrated high-frequency transformer structure comprises a magnetic core middle column, wherein N pairs of magnetic core side columns are arranged outside the magnetic core middle column, N is a positive integer, and the N pairs of magnetic core side columns are circumferentially arranged on the magnetic core middle column; the magnetic core middle column and the magnetic core side column are provided with windings;

the magnetic core side column is U-shaped, and two ends of the magnetic core side column are fixed with the magnetic core middle column; and the windings on the symmetrical side columns of the magnetic core are connected.

Preferably, the number of windings on each core column is several, and the value of N is 2.

Preferably, the magnetic core center pillar is provided with an air gap.

Preferably, the magnetic core side column is provided with an air gap.

Preferably, the core center pillar and the core side pillar are made of a high-permeability magnetic material; and the conducting wire of the winding adopts a litz wire or a copper foil.

Compared with the prior art, the invention has the beneficial effects that:

by decoupling and integrating a plurality of transformers on the same magnetic core at the same time, the work among the transformers is not influenced; and a high-permeability magnetic material is adopted, and the working frequency of the transformer is improved. The number of discrete transformers and the occupied space volume of the discrete transformers can be reduced, the power density of the power converter adopting the integrated high-frequency transformer is greatly improved, and meanwhile, leads among devices can be saved.

Drawings

Fig. 1 is a schematic structural diagram of the high-power cross-type decoupling integrated high-frequency transformer of the invention.

Fig. 2 is a schematic diagram of a first transformer and a second transformer of the high-power cross-type decoupling integrated high-frequency transformer structure.

Fig. 3 is a schematic diagram of a first transformer and a third transformer of the high-power cross-type decoupling integrated high-frequency transformer structure.

Fig. 4 is a decoupled current simulation waveform with only the first transformer energized.

Fig. 5 is a decoupled current simulation waveform with only the second transformer energized.

Fig. 6 is a decoupled current simulation waveform with only the third transformer energized.

1. A first transformer; 2. a second transformer; 3. and a third transformer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides an integrated high-frequency transformer structure of high-power crossing decoupling zero, includes the magnetic core center pillar, the magnetic core center pillar is equipped with N outward to magnetic core side column, and N is the positive integer, N sets up in the magnetic core center pillar to magnetic core side column circumference, and all is the state distribution of crossing setting on the magnetic core center pillar to each pair magnetic core side column. And the magnetic core middle column and the magnetic core side column are provided with windings. After winding, N pairs of magnetic core side columns form N transformers, and the number of turns of each pair of magnetic core side columns of the transformers is half of the total number of turns of the windings; and the center posts of the magnetic core after winding form a transformer, and finally form N +1 transformers. The winding direction of the winding of the magnetic core center pillar is arbitrary. Each pair of windings of the magnetic core side columns are connected in series, so that the directions of magnetic fluxes generated on each pair of corresponding magnetic core side columns are the same.

The magnetic core side column is U-shaped, and two ends of the magnetic core side column are fixed with the magnetic core middle column; and the windings on the symmetrical side columns of the magnetic core are connected. The number of pairs of the symmetrical magnetic core side columns is increased, so that the number of integrated high-frequency transformers can be increased.

The magnetic core side column and the magnetic core middle column can be provided with air gaps according to whether the circuit needs to utilize the excitation inductance of the transformer.

The magnetic core middle column and the magnetic core side column are made of high-permeability magnetic materials and are made of isotropic materials; the skin effect of the winding under the high-frequency condition is considered, and the wire of the winding adopts litz wire or copper foil.

The number of windings on each magnetic core side column is several, the preferred number is 2, and the value of N is 2. In this case, the first transformer 1 is a core center leg, the second transformer 2 is a pair of core legs that are symmetrical, and the third transformer 3 is another pair of core legs. N is 2, which is the minimum value for realizing the structure of the high-power cross-type decoupling integrated high-frequency transformer, and 3 transformers are decoupled and integrated together.

The winding manner of the first transformer 1 and the second transformer 2 is shown in fig. 2, the winding of the first transformer 1 is wound around the center pillar of the transformer core, and the winding direction is arbitrary. The number of turns of the windings of the second transformer 2 is divided into two pairs, the two pairs are wound on the two symmetrical magnetic core side columns respectively, and the windings on the two magnetic core side columns are connected to enable the directions of the generated magnetic fluxes to be the same (clockwise or anticlockwise). Accordingly, the magnetic fluxes generated in the center core legs by the two windings of the second transformer 2 cancel each other out, and therefore, the first transformer 1 is not affected. The induced currents generated by the windings of the first transformer 1 in the two windings of the second transformer 2 cancel each other out, so that the second transformer 2 is not affected. Finally, the first transformer 1 and the second transformer 2 are decoupled.

At this time, the winding manner of the first transformer 1 and the third transformer 3 is as shown in fig. 3, the number of turns of the winding of the third transformer 3 is divided into two pairs, the two pairs are respectively wound on the two symmetrical magnetic core side columns, and the windings on the two magnetic core side columns are connected, so that the directions of the generated magnetic fluxes are the same (clockwise or counterclockwise). Accordingly, the magnetic fluxes generated in the center core legs by the two windings of the third transformer 3 cancel each other out, and therefore, the first transformer 1 is not affected. The induced currents generated by the windings of the first transformer 1 in the two windings of the third transformer 3 cancel each other out, so that the third transformer 3 is not affected. Finally, the first transformer 1 and the third transformer 3 achieve decoupling.

The magnetic fluxes generated in the

third transformer

2 and 3 by the second transformer 2 cancel each other out, and at the same time, the magnetic fluxes generated in the second transformer 2 by the third transformer 3 cancel each other out, so that the second transformer 2 and the third transformer 3 are decoupled. Since the first transformer 1, the second transformer 2 and the third transformer 3 are decoupled. Finally, the three transformers are decoupled and integrated on the same magnetic core.

As can be seen from fig. 4, when only the first transformer is energized, almost no current passes through the second and third transformers. As can be seen from fig. 5, when only the second transformer is energized, almost no current passes through the first and third transformers. As can be seen from fig. 6, when only the third transformer is energized, almost no current flows through the first and second transformers. Therefore, the invention can achieve the purpose of decoupling three transformers.

The working principle is as follows: the structure of the high-power cross-type decoupling integrated high-frequency transformer is suitable for a power electronic converter which needs a plurality of isolation high-frequency transformers, the number N of the outer limb pairs of the symmetric magnetic core of the transformer is determined according to the number of the high-frequency transformers needed by the converter, and the integrated transformer is obtained according to the introduced embodiment. Finally, the integrated transformer is connected in the converter according to the requirements of the converter.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A high-power crossed decoupling integrated high-frequency transformer structure is characterized in that: the magnetic core comprises a magnetic core middle column, wherein N pairs of magnetic core side columns are arranged outside the magnetic core middle column, N is a positive integer, and the N pairs of magnetic core side columns are circumferentially arranged on the magnetic core middle column; the magnetic core middle column and the magnetic core side column are provided with windings;

2. The high-power cross-type decoupling integrated high-frequency transformer structure of claim 1, wherein: the number of windings on each magnetic core column is a plurality, and the numerical value of N is 2.

3. The high-power cross-type decoupling integrated high-frequency transformer structure of claim 1, wherein: the magnetic core center pillar is provided with an air gap.

4. The high-power cross-type decoupling integrated high-frequency transformer structure of claim 1, wherein: the magnetic core side column is provided with an air gap.

5. The high-power cross-type decoupling integrated high-frequency transformer structure of claim 1, wherein: the magnetic core middle column and the magnetic core side column are made of high-permeability magnetic materials; and the lead of the winding adopts a litz wire or a copper foil.