WO2018228154A1

WO2018228154A1 - Transformer framework

Info

Publication number: WO2018228154A1
Application number: PCT/CN2018/088028
Authority: WO
Inventors: 王天均; 宋建峰; 黄俊晓
Original assignee: 广州金升阳科技有限公司
Priority date: 2017-06-15
Filing date: 2018-05-23
Publication date: 2018-12-20
Also published as: CN107170568A

Abstract

A transformer framework, comprising a winding column (01) with a center hole, an upper baffle (02) and a lower baffle (03) that extend outwards from two ends of the winding column (01); a left positioning plate (04) and a right positioning plate (05) are arranged on two sides of the upper baffle (02), the left positioning plate (04) vertically extends upwards along the upper baffle (02) and is of a rectangular structure, and the right positioning plate (05) vertically extends upwards along the upper baffle (02) and is of a V-shaped structure; a primary terminal block (06) and a secondary terminal block (07) are arranged on two sides of the lower baffle (03); pin terminals (08, 09) are vertically arranged on the lower surfaces of the primary terminal block (06) and the secondary terminal block (07); the width of the primary terminal block (06) is greater than that of the secondary terminal block (07), and a through hole (13) is formed in the center of the primary terminal block (06). According to the transformer framework, by means of different structures of the left positioning plate (04) and the right positioning plate (05), the different widths of the primary terminal block (06) and the secondary terminal block (07), and the through hole (13) which is formed in the center of the primary terminal block (06), the area of a magnetic core, the number of winding turns and the creepage distance are ensured in a certain volume to the utmost extent, and accordingly, the power demands are ensured, and the structure of the transformer framework is still very simple.

Description

Transformer skeleton

Technical field

The invention relates to a transformer skeleton, in particular to an electronic transformer skeleton for satisfying safety requirements in a high-power AC-DC switching power supply.

Background technique

The existing AC-DC switching power supply transformer skeleton generally consists of a bobbin with a center hole and a terminal block. As shown in FIG. 1 , the utility model comprises a bobbin 01 with a central hole, an upper baffle 02 and a lower baffle 03 extending outwardly from both ends of the bobbin 01; the upper baffle 02 is symmetrically disposed with left positioning The plate 04 and the right positioning plate 05, the left positioning plate 04 and the right positioning plate 05 extend upwardly and upwardly and have a "V"-shaped structure; the lower baffle 03 is symmetrically disposed with a primary terminal block 06 and a secondary The terminal block 07 and the lower surface of the primary terminal block 06 are uniformly vertically provided with the terminals 08, and the lower surface of the secondary terminal block 07 is uniformly vertically provided with the terminals 09. Due to the bilateral symmetry and the simple mold, the skeleton is easy to purchase for the market model, but the left positioning plate 04 and the right positioning plate 05 are of a "V" type structure, and the center hole of the winding column 01 is wasted. The cross-sectional area of the magnetic core results in a small core area of the assembly and the magnetic flux cannot be maximized, so that the power of the transformer cannot be maximized within a limited volume, which is disadvantageous for product miniaturization.

As shown in FIG. 2, it is another existing transformer skeleton, which differs from FIG. 1 in that the left positioning plate 04 and the right positioning plate 05 symmetrically disposed on both sides of the upper baffle 02 extend upwardly and upwardly. Rectangular structure. The electronic transformer skeleton is wound around the Litz wire as shown in FIG. 3. Since the left positioning plate 04 and the right positioning plate 05 have a rectangular structure, the core area is maximized, but when winding a very thick Litz wire, In the case of a certain height, the coil turns off and the number of turns of the coil is reduced, so that the power of the transformer is reduced, and the power of the transformer is not maximized within a limited volume, which is disadvantageous for miniaturization of the product.

The prior art believes that both the left positioning plate 04 and the right positioning plate 05 of FIG. 1 and FIG. 2 make the power of the transformer not maximized within a limited volume, so in order to meet the power requirement and subject to the symmetrical inertial thinking The effect is to select one of the structures in the design, either to increase the diameter of the bobbin 01 or to lengthen the height of the bobbin 01.

In addition, for high-power AC-DC switching power supplies, in order to meet the design requirements, the technician needs to design a high-power transformer. The higher the power, the larger the creepage distance between the core and the transformer pin terminal, and the core. The creepage distance to the transformer skeleton pin is shown in Figure 4. The thick line shows the creepage distance between the core to the transformer pin terminal. In the conventional design, the technician usually uses the transformer skeleton directly. The height and the width of the terminal block meet the requirements of power and creepage distance, which usually makes the appearance of products using these transformers larger, which is not conducive to miniaturization of products.

The transformer skeleton industry has formed standardized production. There are a large number of public model products in the market. In order to save cost and standardization considerations, the existing technicians usually use the market standardized skeleton directly when designing the transformer. However, as the market changes, AC-DC switching power supply, high power and miniaturization have become the future development direction. The important material electronic transformer skeleton in AC-DC switching power supply must first be designed with high power and miniaturization to meet the future development needs of the industry.

Therefore, within a certain volume, the core area, the number of winding turns and the creepage distance are ensured to the maximum, thereby ensuring that the power demand has become one of the industrial problems, and the prior art has also produced a lot of solutions. The typical scheme is as follows :

1. Patent No. ZL 201520002336.1, a utility model patent entitled “Electronic Transformer Frame and Electronic Transformer for Safety Regulations”. The patent superimposes the distance between the extended terminal block and the installation position of the magnetic core by two-dimensional scale, so that the three layers The position of the insulated wire is not broken to meet the requirements of the safety distance; in addition, the left positioning plate and the right positioning plate of FIG. 1 of the patent are the structure of FIG. 2 of the present application, and the left positioning plate and the right positioning plate of FIG. 2 of the patent. The structure adopted in Fig. 1 of the present application is the prior art;

2. The patent number is ZL 201210338985.X, the invention patent entitled "A combined adjustable transformer skeleton and a transformer using the skeleton", which is assembled by the main frame and the connector and the mounting angle of the connector Adjustment, increase clearance and creepage distance to meet standard requirements;

The above two technical solutions solve the essence of the safety problem is to lengthen the width or height of the terminal block, but in order not to increase the volume of the transformer, the scheme of widening/increasing the terminal block is not so direct, but the structure is special. However, this also makes the structure more complicated, resulting in a complicated winding process, which is not conducive to cost reduction.

Summary of the invention

In view of this, the technical problem to be solved by the present invention is to provide a transformer skeleton that maximizes the core area, the number of turns and the creepage distance within a certain volume, thereby ensuring power demand, and the transformer skeleton structure. Still very simple.

The technical solution of the present invention to solve the above technical problems is as follows:

A transformer skeleton includes a bobbin with a central hole, an upper baffle and a lower baffle extending outwardly from both ends of the bobbin; a left positioning plate and a right positioning plate are disposed on both sides of the upper baffle; A primary terminal block and a secondary terminal block are disposed on both sides of the baffle, and the lower end surface of the primary terminal block and the secondary terminal block are vertically provided with pin terminals; the main terminal block width is greater than the secondary terminal block, the primary terminal block center A through hole is opened; the left positioning plate extends upwardly and upwardly and has a rectangular structure, and the right positioning plate extends upward and extends upwardly and has a "V"-like structure.

Preferably, the length of the central terminal through-hole of the primary terminal block is greater than or equal to the cross-sectional diameter of the winding post after winding the Litz wire.

Preferably, the width of the primary terminal block center through hole is greater than or equal to 1 mm.

As an improvement of the above aspect, the primary terminal block and the secondary terminal block are provided with a wire slot between the adjacent terminals.

Preferably, the cross-sectional shape of the card slot is of a "U" shape.

Preferably, the slot opening of the card slot is smaller than the slot width.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The positioning plate adopts different structures, and the left positioning plate extends upward and extends upwards and has a rectangular structure, which can ensure the cross-sectional area of the transformer core is the maximum cross-sectional area, increase the magnetic flux and increase the power; the right positioning plate extends the baffle It extends vertically upwards and has a "V"-like structure. When the transformer is wound, the Litz wire with a very large diameter can be bent upwards when it is bent, which can ensure the number of windings of the Litz wire and increase the power.

(2) The terminal block adopts different sizes, and the width of the primary terminal block is wider than that of the secondary terminal block, which can increase the creepage distance between the transformer core and the pin terminal of the transformer frame as much as possible, and ensure the minimum volume;

(3) A through hole is opened in the center of the primary terminal block, which can further increase the creepage distance between the transformer core and the pin terminal of the transformer frame to meet UL and other safety requirements.

(4) The terminal block is provided with a card slot between two adjacent pin terminals, which effectively fixes the winding starting and winding, avoids looseness under the condition of re-stress and can effectively prevent the winding from being overfilled and the magnetic core is in direct contact. The risk of the transformer greatly improves the safety and reliability of the transformer.

(5) It is not necessary to design various complicated structures for lengthening the terminal block. Only the width of the primary terminal block is increased, and the through hole is opened in the center of the primary terminal block to solve the safety problem. Therefore, the structure is simple, which is beneficial to reducing the material cost of the transformer;

(6) Due to the simple structure, compared with the prior art, the transformer winding process is also very simple, which is beneficial to reducing the processing cost of the transformer.

DRAWINGS

1 is a perspective structural view of a first prior art electronic transformer skeleton;

2 is a perspective structural view of a second prior art electronic transformer skeleton;

3 is a schematic view showing the winding of the Litz wire by the second existing electronic transformer skeleton;

4 is a schematic view showing the creepage distance between the magnetic core of the second existing electronic transformer and the pin terminal of the transformer frame;

Figure 5 is a perspective structural view of the electronic transformer skeleton of the present application;

Figure 6 is a front elevational view of the electronic transformer skeleton of the present application;

7 is a schematic view of winding a Leeds wire using the electronic transformer skeleton of the present application;

FIG. 8 is a schematic diagram of the creepage distance of the core of the electronic transformer to the transformer skeleton of the present application.

Instructions:

01—winding column; 02—upper baffle; 03—lower baffle; 04—left positioning plate, 05—right positioning plate; 06—primary terminal block; 07—secondary terminal block; 08, 09—pin terminal ; 10, 11, 12 - card slot; 13 - through hole.

detailed description

5 is a perspective view of the electronic transformer skeleton of the present application, and FIG. 6 is a front view of the electronic transformer skeleton of the present application, including a bobbin 01 with a center hole, and an upper baffle extending outward from both ends of the bobbin 01 02 and the lower baffle 03; the left baffle 02 and the right baffle plate 05 are disposed on both sides of the upper baffle 02; the lower baffle 03 is provided with a primary terminal block 06 and a secondary terminal block 07 on both sides thereof, and the lower surface of the primary terminal block 06 A pin terminal 08 is vertically disposed, and a terminal 09 is vertically disposed on a lower surface of the secondary terminal block 07; wherein:

The left positioning plate 04 extends upwardly and upwardly of the baffle 02 and has a rectangular structure. The right positioning plate 05 extends upwardly from the baffle 02 and has a "V"-like structure.

In this embodiment, the primary terminal block 06 and the secondary terminal block 07 are slightly extended outward along the horizontal plane of the lower baffle 03, and the terminal block is disposed between the adjacent terminals with the

card slot

10, 11, 12; The outward extension can widen the terminal block, providing space support for opening more card slots on the side of the terminal block, and widening the horizontal mounting distance between the terminal block and the magnetic core, so that the three-layer insulated wire is not broken. Meet the requirements of safety distance, and make the three-layer insulated wire effectively connect; the cable trunking can effectively fix the winding and take-up of the winding, avoid loosening under the force and effectively prevent the winding from overfilling and direct contact with the core. risks of.

In order to effectively fix the Litz wire, the groove widths of the

card slots

10, 11, 12 are slightly larger than the outer diameter of each of the windings. Preferably, the cross-sectional shape of the

card slot

10, 11, 12 is of a "U" shape, and the slot opening is slightly smaller than the slot width, and the winding of each bell wire diameter can be positioned by pulling in.

The primary terminal block 06 and the secondary terminal block 07 of the present embodiment adopt an asymmetric design, wherein the primary terminal block 06 has a wide width, and a through hole 13 is opened in the middle of the primary terminal block 06, thereby adding a transformer core by a double technical means. The creepage distance to the lead of the transformer skeleton meets the safety requirements such as UL.

In order to obtain a better safety effect, the length of the through hole 13 should be greater than or equal to the cross-sectional diameter of the winding post 01 after winding the Litz wire; in order to facilitate the processing of the demolding, the width of the through hole 13 is greater than or equal to 1 mm.

7 is an intention to use the electronic transformer skeleton of the present application to wind the Litz wire to bend the tail. Compared with FIG. 3, it can be seen that when the thicker Litz wire is finished, the number of winding turns of FIG. 7 is significantly more than that of FIG. 4; 8 is a schematic diagram of the creepage distance of the electronic transformer core to the transformer frame pin terminal of the present application, and the thick line in FIG. 8 shows the creepage distance of the magnetic core to the transformer frame pin terminal of the present application, which is compared with FIG. It can be seen that since the through hole 13 is opened in the middle of the primary terminal block 06, the original walking path of the leakage is blocked, and the creepage distance is skillfully increased from the three straight lines of the prior art to the five straight lines, and the sum of the straight lines The increase does not require a complicated structure to increase the height of the transformer bobbin and the width of the primary terminal block, so that the creepage distance requirement of the core to the transformer pin is maximized within a certain volume.

It should be noted that the position of the left positioning plate 04 of the rectangular structure and the right positioning plate 05 of the "V"-like structure can be exchanged in the drawings of the embodiments of the present invention; or the positions of the primary terminal block 06 and the secondary terminal block 07 can be exchanged. This is an implementation that is easy for the person skilled in the art to implement according to the design requirements, and will not be described herein.

The above is only a preferred embodiment of the present invention, and it should be noted that the above-described preferred embodiments are not to be construed as limiting the scope of the invention, and the scope of the invention should be determined by the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention.

Claims

A transformer skeleton includes a bobbin with a central hole, an upper baffle and a lower baffle extending outwardly from both ends of the bobbin; a left positioning plate and a right positioning plate are disposed on both sides of the upper baffle; A primary terminal block and a secondary terminal block are disposed on both sides of the baffle, and the lower end surface of the primary terminal block and the secondary terminal block are vertically provided with pin terminals; the main terminal block width is greater than the secondary terminal block, the primary terminal block center A through hole is opened; the left positioning plate extends upwardly and upwardly and has a rectangular structure, and the right positioning plate extends upward and extends upwardly and has a "V"-like structure.
The transformer bobbin according to claim 1, wherein the length of the central through hole of the primary terminal block is greater than or equal to the cross-sectional diameter of the winding post after winding the Litz wire.
The transformer bobbin according to any one of claims 1 or 2, wherein the width of the central terminal hole of the primary terminal block is greater than or equal to 1 mm.
The transformer frame according to claim 1, wherein the primary terminal block and the secondary terminal block are provided with a wire slot between the adjacent terminals.
The transformer skeleton according to claim 4, wherein the cross-sectional shape of the wire slot is "U"-like.
The transformer skeleton according to claim 4, wherein the slot opening of the card slot is smaller than the slot width.