CN114694929A

CN114694929A - Transformer and high-voltage generator

Info

Publication number: CN114694929A
Application number: CN202011600022.3A
Authority: CN
Inventors: 范声芳; 何杰; 卢卫彬
Original assignee: Suzhou Powersite Electric Co Ltd
Current assignee: Suzhou Powersite Electric Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2022-07-01

Abstract

The invention discloses a transformer and a high voltage generator, wherein the transformer comprises: the magnetic core comprises a magnetic core, a primary side assembly and a secondary side assembly, wherein the primary side assembly comprises a primary side winding and a primary side supporting piece, the primary side winding is wound on the primary side supporting piece, and the primary side winding is made of a copper foil material; and the secondary side assembly comprises a secondary side winding and a secondary side supporting piece, the secondary side winding is wound on the secondary side supporting piece, and the secondary side assembly is arranged on the outer side of the primary side assembly. According to the transformer with the structure, the primary winding is wound by adopting the copper foil, so that the equivalent excitation inductance of the transformer is increased, and the equivalent leakage inductance of each winding is reduced. The leakage inductance value of the primary side and the secondary side of the transformer is reduced, and the output power of the transformer is further improved.

Description

Transformer and high-voltage generator

Technical Field

The invention relates to the technical field of transformer structures, in particular to a transformer and a high-voltage generator.

Background

The high-voltage generator is a core component of medical X-ray machine, CT, vacuum welding power supply, high-voltage electric dust remover and the like, and is widely applied. The high-frequency transformer is a very critical component, and the primary side and the secondary side of the high-frequency transformer have a large transformation ratio, so that the distributed capacitance and leakage inductance of a transformer winding are both increased rapidly, and the problem of poor phase-to-phase consistency of the high-frequency transformer is caused.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is that in the transformer in the prior art, since the transformation ratio of the primary side and the secondary side of the high-frequency transformer is large, the distributed capacitance and the leakage inductance of the transformer winding are both increased sharply, resulting in the problem of poor phase-to-phase consistency of the high-frequency transformer.

To this end, the present invention provides a transformer comprising:

a magnetic core is arranged on the outer side of the magnetic core,

the primary side assembly comprises a primary side winding and a primary side supporting piece, wherein the primary side winding is wound on the primary side supporting piece and is made of a copper foil material;

and the secondary side assembly comprises a secondary side winding and a secondary side supporting piece, the secondary side winding is wound on the secondary side supporting piece, and the secondary side assembly is arranged on the outer side of the primary side assembly.

Optionally, in the transformer, the secondary winding is wound by using an enameled wire.

Optionally, in the transformer, the primary winding is uniformly wound around the outer side of the magnetic core; the secondary winding comprises a plurality of secondary winding units, and the secondary winding units are wound on the outer side of the primary winding in a segmented and uniform mode.

Optionally, in the transformer, the magnetic core is a U-shaped magnetic core and/or a cylindrical magnetic core and/or a right-angle magnetic core.

Optionally, in the transformer, the primary side supporting element and/or the secondary side supporting element are made of a polymer material.

Optionally, the transformer further includes a fixing member, where the fixing member is installed outside the secondary winding, is fixedly connected to the outside of the magnetic core, and is adapted to fix a relative position between the magnetic core and the secondary winding.

Optionally, the transformer further includes a high-voltage insulator, the high-voltage insulator is mounted on the magnetic core, and a side wall surface of the high-voltage insulator abuts against the fixing member.

A high voltage generator comprises the transformer.

Optionally, the above high voltage generator further comprises: the output end of the filter is connected with the input end of the inverter, and the output end of the inverter is connected with the input end of the primary winding.

Optionally, the above-mentioned high voltage generator, a pre-charge rectification unit, is disposed between the input filter and the inverter;

and the input end of the high-voltage rectifying unit is connected with the output end of the transformer.

The technical scheme provided by the invention has the following advantages:

1. the invention provides a transformer, comprising: the magnetic core comprises a magnetic core, a primary side assembly and a secondary side assembly, wherein the primary side assembly comprises a primary side winding and a primary side supporting piece, the primary side winding is wound on the primary side supporting piece, and the primary side winding is made of a copper foil material; and the secondary side assembly comprises a secondary side winding and a secondary side supporting piece, the secondary side winding is wound on the secondary side supporting piece, and the secondary side assembly is arranged on the outer side of the primary side assembly. According to the transformer with the structure, the primary winding is wound by adopting the copper foil, so that the equivalent excitation inductance of the transformer is increased, and the equivalent leakage inductance of each winding is reduced. The leakage inductance value of the primary side and the secondary side of the transformer is reduced, and the output power of the transformer is further improved.

2. In the conventional high-frequency transformer, a secondary winding is wound on the outer side of a primary winding, and the secondary winding passes through a rectifying circuit and is output in series to further output high-frequency voltage. The transformer with the structure has the advantages that the secondary winding units are uniformly wound around the primary coil, so that leakage inductance among the secondary windings is more uniform, the phase-to-phase consistency is improved, output voltage among the secondary winding units of the secondary winding in the transformer is more balanced when the transformer is loaded, the voltage stress of the secondary windings and the rectifying circuit of the secondary winding is greatly reduced, and the transformer is prevented from being burnt out.

3. According to the transformer provided by the invention, the primary side supporting piece and/or the secondary side supporting piece are made of high polymer materials. The transformer with the structure realizes high-grade voltage insulation between the primary winding and the secondary winding.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a transformer provided in an embodiment of the invention;

fig. 2 is an exploded view of a transformer provided in an embodiment of the invention;

fig. 3 is a schematic structural diagram of a primary side component of a transformer provided in an embodiment of the invention;

description of reference numerals:

1-a magnetic core;

2-a primary side component; 21-a primary winding; 22-primary side support;

3-a secondary side assembly; 31-secondary winding; 32-a secondary edge support;

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a transformer, as shown in fig. 1 to 3, including: magnetic core 1, primary side subassembly 2 and secondary side subassembly 3. The primary side assembly 2 comprises a primary side winding 21 and a primary side supporting piece 22, wherein the primary side winding 21 is wound on the primary side supporting piece 22, and the primary side winding 21 is made of a copper foil material; the secondary assembly 3 comprises a secondary winding 31 and a secondary support 32, the secondary winding 31 is wound on the secondary support 32, and the secondary assembly 3 is installed on the outer side of the primary assembly 2.

Specifically, in the present embodiment, the primary winding 21 is uniformly wound around the outer side of the magnetic core 1; the secondary winding 31 includes a plurality of secondary winding units wound in segments uniformly around the outer side of the primary winding 21. The transformer with the structure has the advantages that the secondary winding units are arranged, namely, the secondary coil is uniformly wound around the primary winding, so that leakage inductance between the secondary windings is more uniform, the phase-to-phase consistency is improved, output voltage between the secondary winding units of the secondary winding of the transformer is more balanced when the transformer is loaded, voltage stress of the secondary windings and the rectifying circuit of the secondary winding is greatly reduced, and the transformer is prevented from being burnt out.

In this embodiment, the secondary winding 31 is wound by an enameled wire.

In this embodiment, the magnetic core 1 is a U-shaped magnetic core. Of course, in alternative embodiments, a cylindrical core or a right-angle core may be used. Of course, a combination of multiple types of cores may be used. For example, U-shaped magnetic cores are selected at two ends, cylindrical magnetic cores are adopted between the two U-shaped magnetic cores, and the number of the cylindrical magnetic cores can be set to be 2-8. The number of the cylindrical magnetic cores can be selected according to actual requirements.

In this embodiment, the primary side support 22 or the secondary side support 32 is made of a polymer material. In the embodiment, both the primary side support 22 and the secondary side support 32 serve as a framework for supporting the windings, and the framework made of a polymer material is further used for realizing high-level voltage insulation between the primary and secondary windings 31. In this embodiment, the primary side supporting element 22 and the secondary side supporting element 32 may be made of HDPE (High Density Polyethylene, also called low pressure Polyethylene), or other Polyethylene materials may be used according to the requirement.

The transformer in this embodiment further comprises a fixing member, which is installed outside the secondary winding 31 and is fixedly connected to the outside of the magnetic core 1, and is adapted to fix the relative positions of the magnetic core 1 and the secondary winding 31. Specifically, the fixing member may be a band, and the band is mounted on the outer side of the secondary winding 31, thereby positioning the secondary winding 31.

In this embodiment, the transformer further includes a high voltage insulator, the high voltage insulator is mounted on the magnetic core 1, and a side wall surface of the high voltage insulator abuts against the fixing member. Further insulating effect.

Specifically, in the present embodiment, the primary coil is made of a copper foil material, and the primary winding 21 is wound by using a copper foil, so that the equivalent excitation inductance of the transformer is increased, and the equivalent leakage inductance of each winding is reduced. The leakage inductance value of the primary side and the secondary side of the transformer is reduced, and the output power of the transformer is further improved. With the transformer in the embodiment, the equivalent exciting inductance is increased from 250 muH to 350 muH, and the equivalent leakage inductance is reduced from 12 muH to 6 muH.

Example 2

The present embodiment provides a high voltage generator, which includes: a filter, an inverter, a pre-charge rectification unit, a high-voltage rectification unit, and the transformer in embodiment 1. The output end of the filter is connected with the input end of the inverter, and the output end of the inverter is connected with the input end of the primary winding 21. The pre-charging rectification unit is arranged between the input filter and the inverter; the input end of the high-voltage rectifying unit is connected with the output end of the transformer. It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A transformer, comprising:

a magnetic core (1),

the primary side assembly (2) comprises a primary side winding (21) and a primary side supporting piece (22), wherein the primary side winding (21) is wound on the primary side supporting piece (22), and the primary side winding (21) is made of a copper foil material;

the secondary side assembly (3) comprises a secondary side winding (31) and a secondary side supporting piece (32), the secondary side winding (31) is wound on the secondary side supporting piece (32), and the secondary side assembly (3) is installed on the outer side of the primary side assembly (2).

2. The transformer according to claim 1,

and the secondary winding (31) is wound by adopting an enameled wire.

3. The transformer according to claim 2,

the primary winding (21) is uniformly wound on the outer side of the magnetic core (1); the secondary winding (31) comprises a plurality of secondary winding units, and the secondary winding units are wound on the outer side of the primary winding (21) in a segmented and uniform mode.

4. Transformer according to any one of claims 1 to 3,

the magnetic core (1) is a U-shaped magnetic core (1) and/or a cylindrical magnetic core (1) and/or a right-angle magnetic core (1).

5. Transformer according to any of claims 1 to 3,

the primary side support (22) and/or the secondary side support (32) are made of a polymer material.

6. Transformer according to any of claims 1 to 3,

the magnetic core is characterized by further comprising a fixing piece, wherein the fixing piece is arranged on the outer side of the secondary winding (31), is fixedly connected with the outer side of the magnetic core (1), and is suitable for fixing the relative position of the magnetic core (1) and the secondary winding (31).

7. The transformer according to claim 6,

still include high-voltage insulation spare, high-voltage insulation spare is installed on magnetic core (1), just the lateral wall face of high-voltage insulation spare with the mounting butt.

8. A high voltage generator, characterized in that it comprises a transformer according to any one of claims 1-7.

9. The high voltage generator according to claim 8,

further comprising: the output end of the filter is connected with the input end of the inverter, and the output end of the inverter is connected with the input end of the primary winding (21).

10. The high voltage generator according to claim 9,

a pre-charge rectification unit disposed between the input filter and the inverter;