CN219085777U

CN219085777U - High-frequency transformer

Info

Publication number: CN219085777U
Application number: CN202320059483.7U
Authority: CN
Inventors: 李叶富; 桑晨; 刘艳玲
Original assignee: Spellman Electronic Technology Suzhou Industrial Park Co ltd
Current assignee: Spellman Electronic Technology Suzhou Industrial Park Co ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-05-26
Anticipated expiration: 2033-01-09

Abstract

The utility model relates to a high-frequency transformer which comprises a shell, a nanocrystalline magnetic core, a low-voltage winding and a high-voltage winding, wherein the nanocrystalline magnetic core is provided with a pair of nanocrystalline magnetic cores, the nanocrystalline magnetic cores are U-shaped, two ends of the nanocrystalline magnetic cores are in butt joint and are connected through bolts, the low-voltage winding is provided with a pair of nanocrystalline magnetic cores, one of the low-voltage windings is sleeved at one end of the nanocrystalline magnetic cores, the other low-voltage winding is sleeved at the other end of the nanocrystalline magnetic cores, the low-voltage windings are mutually connected in series, the high-voltage winding is sleeved on one of the low-voltage windings, and the nanocrystalline magnetic cores, the low-voltage winding and the high-voltage winding which are in butt joint through the bolts are arranged in the shell filled with insulating oil. The high-frequency transformer can avoid the occurrence of the magnetic saturation phenomenon, can improve the energy conversion efficiency, enhance the heat dissipation performance, reduce the parasitic capacitance, improve the inductance and the Q value under the condition of ensuring the constant transformation ratio, has simple structure and strong practicability, and can be widely applied to the medical technical field or other switch power supply fields.

Description

High-frequency transformer

Technical Field

The utility model belongs to the technical field of transformers, and particularly relates to a high-frequency transformer.

Background

The high-frequency transformer generally refers to a transformer with the working frequency of more than or equal to 10kHz, and has the advantages of light weight, small volume, high efficiency and the like compared with a power frequency transformer, so that the high-frequency transformer is a main component of a switching power supply and is an important component of a medical high-voltage generator. As the requirements of the medical diagnosis equipment on the image quality are higher and higher, the stability of the high voltage of the X-ray generator is required to be greatly improved, so that the stability of the image brightness is ensured, the radiation dose of a patient is continuously reduced, and the damage to the human body is reduced. For an X-ray generator, the rise of high voltage kV is very fast, so that the radiation dose to the human body can be reduced, and the performance of the high frequency transformer determines the rise of high voltage kV. Therefore, high-frequency transformers with high efficiency and high performance are the focus of research and development by those skilled in the art.

The coils of the existing high-frequency transformer are usually wound together, so that serious heating phenomenon is easy to occur in the long-term working process, and the coils of the existing high-frequency transformer are wound in parallel by a machine, so that parasitic capacitance among the coils is large, inductance value is small, and power conversion value is low.

The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The utility model aims to provide a high-frequency transformer which is used for solving the problems that the existing high-frequency transformer is serious in heating phenomenon in long-term operation, large in parasitic capacitance between coils, small in inductance value, low in power conversion value and the like.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high frequency transformer comprising:

a housing;

nanocrystalline magnetic core: the nanocrystalline magnetic cores are arranged in the shell, the nanocrystalline magnetic cores are U-shaped, the sections of the end parts of the nanocrystalline magnetic cores are round, and the two ends of the nanocrystalline magnetic cores are mutually butted and detachably connected through bolts;

low voltage winding: the low-voltage windings are provided with a pair, one of the pair of low-voltage windings is sleeved at one end of the pair of nanocrystalline magnetic cores at the same time, the other of the pair of low-voltage windings is sleeved at the other end of the pair of nanocrystalline magnetic cores at the same time, and the pair of low-voltage windings are connected in series with each other;

high voltage winding: the high-voltage winding is sleeved on one of the pair of low-voltage windings.

Preferably, the low-voltage winding comprises a low-voltage winding skeleton and litz windings, the low-voltage winding skeleton is sleeved at the end parts of the pair of nanocrystalline magnetic cores at the same time, the litz windings are spirally wound on the outer surface of the low-voltage winding skeleton, and the litz windings of the pair of low-voltage windings are connected in series.

Further preferably, a pair of said low voltage windings share one said litz wire.

Preferably, the high-voltage winding comprises a high-voltage winding framework and wire-wrapped coils, the high-voltage winding framework is sleeved on one of the pair of low-voltage windings, the wire-wrapped coils are provided with a plurality of wire-wrapped coils, the wire-wrapped coils are sleeved on the outer surface of the high-voltage winding framework, the wire-wrapped coils are connected with each other, and a gap exists between every two adjacent wire-wrapped coils.

Further preferably, the high-voltage winding framework comprises a cylinder, and annular bosses are arranged at two ends of the cylinder.

Still more preferably, the outer diameter of the wire wrap coil is smaller than or equal to the outer diameter of the annular boss.

Further preferably, the silk-covered coil is made by winding a plurality of silk-covered wires, and the plurality of silk-covered coils are connected through at least one silk-covered wire.

Preferably, one of the pair of nanocrystalline magnetic cores is provided with a through hole penetrating through the end part of the nanocrystalline magnetic core, the other of the pair of nanocrystalline magnetic cores is provided with a threaded hole, and the bolt penetrates through the through hole to be in threaded connection with the threaded hole.

Preferably, the shell is filled with insulating oil.

Preferably, the shell is made of metal materials.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

according to the utility model, the pair of U-shaped nanocrystalline magnetic cores which are mutually butted are arranged, so that a certain air gap exists in a magnetic circuit formed after butt joint, the occurrence of the magnetic saturation phenomenon is avoided, and the pair of low-voltage windings arranged on the nanocrystalline magnetic cores are mutually connected in series, and the high-voltage winding is arranged on one low-voltage winding, so that the energy conversion efficiency is improved, the heat dissipation performance is greatly enhanced, the parasitic capacitance is reduced, the inductance and the Q value are improved, the structure is simple, the practicability is strong, and the device can be widely applied to the medical technical field or other switching power supply fields.

Drawings

Fig. 1 is a schematic perspective view of a high-frequency transformer according to the present embodiment;

fig. 2 is a schematic structural view of the high-voltage winding of the present embodiment;

fig. 3 is a schematic structural diagram of a high-voltage winding frame according to the present embodiment;

fig. 4 is a schematic structural view of a pair of low-voltage windings according to the present embodiment.

In the above figures:

1. a housing; 2. a nanocrystalline magnetic core; 21. a bolt; 3. a low voltage winding; 31. a low voltage winding former; 32. litz wire winding; 33. an adhesive tape; 4. a high voltage winding; 41. a high voltage winding former; 411. a cylinder; 412. an annular boss; 42. and (5) wrapping the coil by silk.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. 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 utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model provides a high frequency transformer, as shown in fig. 1, includes casing 1, nanocrystalline magnetic core 2, low voltage winding 3 and high voltage winding 4, and nanocrystalline magnetic core 2 sets up in casing 1, and low voltage winding 3 and high voltage winding 4 all set up on nanocrystalline magnetic core 2 and lie in casing 1.

The following details of each component and its connection relation are described in detail:

as shown in fig. 1, the interior of the housing 1 is provided with a cavity, the housing 1 is made of metal material, preferably metal aluminum; the inside of the shell 1 is filled with insulating oil, which is not only beneficial to enhancing insulation, but also can achieve the purpose of enhancing heat dissipation, and the insulating oil can be, for example, transformer oil.

As shown in fig. 1, the nanocrystalline magnetic cores 2 are provided with a pair, the nanocrystalline magnetic cores 2 are all provided in the housing 1, the nanocrystalline magnetic cores 2 are U-shaped, and the sections of the ends thereof are circular, and the ends of the nanocrystalline magnetic cores 2 are connected by bolts 21 after being butted with each other. Specifically, one end of one of the pair of nanocrystalline magnetic cores 2 is detachably connected to one end of the other of the pair of nanocrystalline magnetic cores 2 through the bolt 21, and a certain gap exists between the two, so that the occurrence of the magnetic saturation phenomenon can be avoided, the other end of one of the pair of nanocrystalline magnetic cores 2 is also detachably connected to the other end of the other of the pair of nanocrystalline magnetic cores 2 through the bolt 21, and a certain gap also exists between the two. Specifically: one of the pair of nanocrystalline magnetic cores 2 is provided with a through hole penetrating through the end part of the nanocrystalline magnetic core, the other of the pair of nanocrystalline magnetic cores 2 is provided with a threaded hole, a bolt 21 penetrates through the through hole to form threaded connection with the threaded hole, a certain gap exists between the end parts of the pair of nanocrystalline magnetic cores 2, and the magnetic saturation phenomenon is avoided.

The nanocrystalline magnetic core 2 is made of a novel soft magnetic material, has high saturation magnetism and very low high-frequency loss, and the soft magnetic is a magnet made of materials such as iron, and the like, so that the magnetism can disappear in a short time after magnetization, and cannot be permanently maintained.

As shown in fig. 1 and 4, the low-voltage windings 3 are provided in a pair, one of the pair of low-voltage windings 3 is simultaneously sleeved at one end of the pair of nanocrystalline magnetic cores 2, the other of the pair of low-voltage windings 3 is simultaneously sleeved at the other end of the pair of nanocrystalline magnetic cores 2, and the pair of low-voltage windings 3 are connected in series with each other.

Specifically: as shown in fig. 1 and 4, the low-voltage winding 3 includes a low-voltage winding frame 31 and litz windings 32, the low-voltage winding frame 31 is hollow, and the low-voltage winding frame 31 is simultaneously sleeved at the ends of a pair of low-voltage windings; the litz wire 32 is a conductor formed by twisting or braiding a plurality of independently insulated conductors, the litz wire 32 is spirally wound on the outer surface of the low-voltage winding frame 31, the litz wire 32 can effectively increase the surface area of the winding and reduce the occurrence of skin effect, and the litz wires 32 of the pair of low-voltage windings 3 are connected in series with each other, in this embodiment, the pair of low-voltage windings 3 share one litz wire 32. By adopting the mode that the pair of low-voltage windings 3 are mutually connected in series, under the condition that the number of windings is unchanged and the magnetic flux is unchanged, parasitic capacitance between the pair of low-voltage windings 3 is greatly reduced, damage is reduced, conversion efficiency is greatly improved, and meanwhile heat dissipation of the low-voltage windings 3 is facilitated.

In addition, as shown in fig. 1, in order to ensure that the position of the litz wire 32 on the low-voltage winding former 31 is kept fixed, the outer surface of the low-voltage winding former 31 is further wrapped with an adhesive tape 33, that is, the litz wire 32 is located between the low-voltage winding former 31 and the adhesive tape 33, and the adhesive tape 33 keeps the position of the litz wire 32 fixed. Of course, only one embodiment is presented here, but is not limited to this embodiment.

As shown in fig. 1, the high-voltage winding 4 is sleeved on one of the pair of low-voltage windings 3, the high-voltage winding 4 specifically includes a high-voltage winding skeleton 41 and a filament-covered coil 42, the high-voltage winding skeleton 41 is hollow, the high-voltage winding skeleton 41 is sleeved on one of the pair of low-voltage windings 3, and the filament-covered coil 42 is sleeved on the outer surface of the high-voltage winding skeleton 41.

Specifically: as shown in fig. 2 and 3, the high-voltage winding frame 41 includes a cylinder 411, annular bosses 412, the annular bosses 412 being coaxially disposed at both ends of the cylinder 411; the wire-wrapped coil 42 can effectively increase the winding surface area and reduce the occurrence of skin effect, the wire-wrapped coil 42 is sleeved on the outer surface of the cylinder 411 of the high-voltage winding framework 41, for example, the wire-wrapped coil 42 can be fixed on the outer surface of the cylinder 411 in an adhesive manner, however, only one embodiment is given here, but the utility model is not limited to this embodiment; the outer diameter of the filament coil 42 is less than or equal to the outer diameter of the annular boss 412; the silk-covered coils 42 are provided with a plurality of silk-covered coils 42, the silk-covered coils 42 are connected with each other, gaps exist between two adjacent silk-covered coils 42, and heat dissipation is facilitated under the condition of insulation assurance; the wire-wrapped coil 42 is formed by winding a plurality of wire-wrapped wires, the plurality of wire-wrapped coils 42 are connected through at least one wire-wrapped wire, the wire-wrapped wire is formed by winding natural wires or glass wires serving as insulating cladding wires, and the wire-wrapped coil 42 is formed by winding a honeycomb technology, so that parasitic capacitance is reduced, inductance is improved, and conversion efficiency is improved greatly.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims

1. A high frequency transformer, characterized by: comprising the following steps:

a housing;

2. The high frequency transformer according to claim 1, wherein: the low-voltage winding comprises a low-voltage winding framework and litz windings, the low-voltage winding framework is sleeved at the end parts of the pair of nanocrystalline magnetic cores at the same time, the litz windings are spirally wound on the outer surface of the low-voltage winding framework, and the litz windings of the pair of low-voltage windings are connected in series.

3. The high frequency transformer according to claim 2, wherein: a pair of said low voltage windings share one of said litz windings.

4. The high frequency transformer according to claim 1, wherein: the high-voltage winding comprises a high-voltage winding framework and wire-wrapped coils, the high-voltage winding framework is sleeved on one of the pair of low-voltage windings, the wire-wrapped coils are provided with a plurality of wire-wrapped coils, the wire-wrapped coils are sleeved on the outer surface of the high-voltage winding framework, the wire-wrapped coils are connected with each other, and a gap exists between every two adjacent wire-wrapped coils.

5. The high frequency transformer according to claim 4, wherein: the high-voltage winding framework comprises a cylinder body, and annular bosses are arranged at two ends of the cylinder body.

6. The high frequency transformer according to claim 5, wherein: the outer diameter of the silk package coil is smaller than or equal to the outer diameter of the annular boss.

7. The high frequency transformer according to claim 4, wherein: the silk-covered coil is made by mutually winding a plurality of silk-covered wires, and the silk-covered coils are connected through at least one silk-covered wire.

8. The high frequency transformer according to claim 1, wherein: one of the pair of nanocrystalline magnetic cores is provided with a through hole penetrating through the end part of the nanocrystalline magnetic core, the other of the pair of nanocrystalline magnetic cores is provided with a threaded hole, and the bolt penetrates through the through hole to be in threaded connection with the threaded hole.

9. The high frequency transformer according to claim 1, wherein: the shell is filled with insulating oil.

10. The high frequency transformer according to claim 1, wherein: the shell is made of metal materials.