CN215933335U

CN215933335U - Transformer

Info

Publication number: CN215933335U
Application number: CN202121855870.9U
Authority: CN
Inventors: 张锋; 朱勇; 肖奇柳; 王伟红
Original assignee: SHENZHEN JINGQUANHUA ELECTRONICS CO LTD
Current assignee: SHENZHEN JINGQUANHUA ELECTRONICS CO LTD
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-03-01
Anticipated expiration: 2031-08-09

Abstract

The utility model discloses a transformer, which comprises a winding framework, a magnetic yoke consisting of an upper magnetic core yoke and a lower magnetic core yoke, and a magnetic column group arranged between the upper magnetic core yoke and the lower magnetic core yoke, wherein the magnetic column group comprises a first magnetic column, a second magnetic column and a third magnetic column; the magnetic core upper yoke and the magnetic core lower yoke are E-shaped, and the winding framework is sleeved outside the second magnetic column; each magnetic column is composed of a plurality of sub-magnetic columns with the same thickness, and insulating components are attached to the upper part and the lower part of each sub-magnetic column. When the transformer works, the heat can be uniformly dispersed, and the risk of overheating is reduced.

Description

Transformer

Technical Field

The utility model relates to the technical field of electronic components, in particular to a transformer.

Background

Transformers are electronic components that are often used in electronic products. It converts the voltage of alternating current by electromagnetic induction. Along with the extension of product live time and frequency of use, the work load of transformer is bigger, consequently can produce a large amount of heat energy for the product itself generates heat and promotes.

In addition, in order to meet the requirement of the electronic product for sensing quantity, a mode of opening an air gap in the center pillar is often used. Reducing the air gap is widely used in low frequency transformers, but there is a phenomenon in which loss increases in high frequency transformers. Only set up the air gap at the center pillar, the heat that produces is too concentrated, and the heat dissipation is slower, and consequently, the transformer produces more heat energy at the during operation for the product intensification is serious, takes place overheated phenomenon easily, brings the influence for the work of other components and parts in the electronic product, has also caused the higher hidden danger of being burnt out of transformer temperature.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the conventional transformer is easy to overheat along with the increase of the service time and the service frequency. In order to overcome the defects in the prior art, the transformer is provided.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

a transformer, the transformer includes bobbin, and by the yoke that the yoke of magnetic core upper yoke and magnetic core lower yoke are constituteed, still includes:

the magnetic column group is arranged between the magnetic core upper yoke and the magnetic core lower yoke and comprises a first magnetic column, a second magnetic column and a third magnetic column;

the magnetic core upper yoke and the magnetic core lower yoke are E-shaped, and the winding framework is sleeved outside the second magnetic column;

each magnetic column is composed of a plurality of sub-magnetic columns with the same thickness, and insulating components are attached to the upper part and the lower part of each sub-magnetic column. The transformer specifically comprises.

The transformer, wherein the insulating member is an air gap sheet.

The magnetic yoke comprises a magnetic yoke base, a first extension column, a second extension column and a third extension column, wherein the first extension column, the second extension column and the third extension column are formed by oppositely extending the upper magnetic core yoke and the lower magnetic core yoke;

the side edge of the magnet yoke base, which is connected with the first extension column, the second extension column and/or the third extension column, is provided with a fixing position.

The transformer, wherein, the fixed position including set up in the yoke base with the first recess of the side that the second extension post is connected.

The transformer, wherein, in the yoke base with first extension post and/or the side that the second extension post is connected is equipped with trapezoidal breach.

The winding framework comprises a winding part and a winding base fixedly connected with two ends of the winding part;

the winding portion is provided with a plurality of heat dissipation holes.

The transformer is characterized in that a first side face and a second side face of the transformer are provided with second grooves matched with the winding base, the first side face is a side face of the first magnetic column facing the second magnetic column, and the second side face is a side face of the third magnetic column facing the second magnetic column.

The bottom surface of the second magnetic column is matched with the end surface of the winding part.

Has the advantages that: compared with the prior art, the utility model provides a transformer which comprises a winding framework, a magnetic yoke and a magnetic column group arranged between the upper yoke and the lower yoke of a magnetic core. Because the size of magnetic resistance is directly proportional with the length of magnetic circuit, and is inversely proportional with the magnetic permeability and the cross-section of material, the magnetic resistance that insulating member produced is bigger, consequently, when transformer during operation, based on the distribution of insulating member, the regional evenly distributed that also generates heat, consequently has avoided thermal concentration, improves the radiating efficiency, improves the security and the stability of transformer.

Drawings

Fig. 1 is a schematic structural diagram of a transformer including a bobbin according to the present invention.

Fig. 2 is a schematic structural diagram of the transformer provided by the present invention without a bobbin.

Fig. 3 is a schematic diagram of a simulation of magnetic resistance in a transformer according to the present invention.

Fig. 4 is a schematic structural diagram of a yoke in a transformer according to the present invention.

Fig. 5 is a top view of a yoke in a transformer according to the present invention.

Fig. 6 is a schematic structural diagram of a bobbin in a transformer according to the present invention.

Fig. 7 is a schematic structural diagram of a neutron magnetic column in the transformer provided by the utility model.

The meanings marked in the drawings are as follows:

10, a transformer; 100, winding a bobbin; 110, a winding portion; 111, heat dissipation holes; 120, a winding base; 210, a core upper yoke; 220, a core lower yoke; 230, a first extended column; 240, a second extended column; 250, a third extended column; 260, a yoke base; 262, a first recess; 263, trapezoidal notch; 310, a first magnetic pillar; 320, a second magnetic pillar; 330, a third magnetic column; a, a sub-magnetic column; b, an insulating member; a-1, a second groove.

Detailed Description

The present invention provides a transformer, and in order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The following description of the embodiments will further explain the present invention by referring to the figures.

As shown in fig. 1 and 2, the present embodiment provides a transformer 10, and the transformer 10 includes a bobbin 100, a yoke, and a magnetic pole set.

The winding bobbin 100 is used for winding a transmission line, and includes a winding portion 110 and a winding base 120, wherein the winding portion 110 is directly used for winding the transmission line, and the winding base 120 is used for limiting the position of the transmission line on the winding portion 110 and providing a stable winding structure.

The yoke includes upper yoke and lower yoke, and upper and lower yoke is E type yoke, and both place relatively.

The magnetic pole group is arranged between the upper magnetic yoke and the lower magnetic yoke and comprises a first magnetic pole 310 and a third magnetic pole 330 which are positioned at two sides, and a second magnetic pole 320 positioned between the first magnetic pole 310 and the third magnetic pole 330.

When the assembly is completed, the bobbin 100 is sleeved outside the second magnetic pillar 320.

Each magnetic column is composed of a plurality of sub magnetic columns A300, and in order to achieve uniform distribution of heat, the thicknesses of the sub magnetic columns A are the same. In addition, an insulating member B is attached above or below each sub-magnetic pillar a. Therefore, the magnetic pole is equally divided into a plurality of segments.

The working principle is as follows:

in the present embodiment, the transformer 10 has two windings, the windings are wound in the same manner as in the conventional scheme, and the insulating members B and the sub-magnetic poles a are uniformly distributed. When an alternating current is passed through the transformer 10, an alternating magnetic flux is generated in the core. Due to the uniform distribution, the reluctance of the core of the entire transformer 10 is similar to a series of multiple reluctance. In addition, since many of the series-connected magnetic resistances are generated by the sub-magnetic pillars a and the insulating members B uniformly distributed in and around the transformer 10, the heat generating region of the transformer 10 is also uniformly distributed, thereby increasing the heat dissipation effect of the transformer 10 as a whole.

In the present embodiment, the insulating member B is an air gap sheet. The number of the sub-magnetic columns A of each magnetic column is 6, the number of the air gap pieces is 7, and the selected upper and lower magnetic yokes are EQ magnetic yokes. In assembling the transformer 10, the lower yoke is placed first, and then the first insulating member B is placed on the lower yoke. In order to reduce the thickness of the magnetic pole, the insulating member B used in this embodiment is a 0.13mm air gap sheet. Then, the sub-magnetic pole a of the first magnetic pole 310 is placed on the air gap piece, the thickness of the sub-magnetic pole a is 5mm, then the second air gap piece is placed, and the steps are sequentially carried out until the seventh air gap piece is placed, and the assembly of the first magnetic pole 310 is completed. The second and third

magnetic pillars

320 and 330 are assembled in this way, following the assembly of the first magnetic pillar 310. Then the bobbin 100 wound with the transmission line is sleeved outside the second magnetic pillar 320, and finally the upper magnetic yoke is placed above the first magnetic pillar 310, the second magnetic pillar 320 and the third magnetic pillar 330. By contrast, after the scheme is adopted, the leakage inductance of the transformer 10 is reduced from 14.5uH to 13.2 uH. In addition, due to the decrease of the leakage inductance, the proximity effect of the magnetic line to the winding coil is decreased, so that the ACR value of the coil on the bobbin 100 is decreased. The measured ACR resistance is reduced from 84 milliohms to 76 milliohms, the temperature of the transformer 10 is reduced by 35 ℃, and the safety and the stability of the transformer 10 are guaranteed.

The formula of the magnetic resistance is

Wherein R is_mIs the reluctance of the material m, L is the length of the magnet, μ is the permeability, and S is the cross-sectional area of the material. Therefore, the magnitude of the magnetic resistance is proportional to the length of the magnetic circuit and inversely proportional to the permeability and cross-section of the material. Since the magnetic permeability of the magnetic pole is 3300, the magnetic resistance generated by the insulating member B is much greater than that generated by the sub-magnetic pole a, and thus, the loss is concentrated at the insulating member B, and the area generating heat energy is also uniformly distributed based on the distribution of the insulating member B, thereby improving the heat dissipation efficiency.

As shown in fig. 3, with the transformer 10 in the present embodiment, RG (magnetic resistance of the insulating member B) is much larger than RF (magnetic resistance of the sub-magnetic pole a and the upper and lower yokes). Since the plurality of sub-magnetic columns a and the insulating member B are uniformly distributed, the loss generated by the insulating member B is also uniformly distributed around the transformer 10.

Further, the side surface of the conventional yoke is a plane, so that the finger fixing effect may be poor during assembly. Therefore, in the present embodiment, as shown in fig. 4, the yoke is an E-shaped yoke, and includes a yoke base 260, a first extending column 230, a second extending column 240, and a third extending column 250. The first extending column 230, the second extending column 240 and the third extending column 250 are formed by extending the upper core yoke 210 and the lower core yoke 220 in opposite directions, the first extending column 230 and the third extending column 250 are located at two sides of the core base, and the second extending column 240 is located in the middle of the yoke base 260. The side of the yoke base 260 connected to the first extension column 230, the second extension column 240 and/or the third extension column 250 is provided with a fixing position for fixing a finger of a user or other rotation-combining devices.

In the first embodiment of this embodiment, the fixing locations are located at two sides of the yoke base 260 connected to the second extending column 240, and the shape of the fixing locations is a first groove 262 with a V-shaped structure. When assembling the transformer 10, a user can hold a finger at the position of the first groove 262, so that the transformer can be stably assembled.

In a second embodiment of this embodiment, a trapezoidal notch 263 is disposed on a side of the yoke base 260 connected to the first extending column 230 and/or the second extending column 240, so that a user can stabilize the yoke through the trapezoidal notch 263 when assembling the yoke.

Further, as shown in fig. 5, the first embodiment and the second embodiment may be combined and arranged.

When the transformer 10 is in operation, the second magnetic pillar 320 sleeved by the bobbin 100 dissipates heat. If the bobbin 100 does not have a heat dissipation function, the second magnetic pillar 320 concentrates heat. Therefore, the bobbin 100 needs to have a heat dissipation function. The bobbin 100 includes a winding portion 110 and a winding base 120. The two winding bases 120 are respectively fixedly connected to two ends of the winding portion 110, and are used for limiting a coil wound around the winding portion 110. As shown in fig. 6, a plurality of heat dissipation holes 111 are formed in the winding portion 110 for dissipating heat generated by the second magnetic pillars 320.

Further, as shown in fig. 7, the first, second, and third

magnetic pillars

310, 320, and 330 may have the same shape. However, the edge of the bobbin 120 in the bobbin 100 has a certain curvature, such as a circle or a rectangle with round corners. Therefore, in order to reduce the warning of the transformer 10 while ensuring the function, the bottom surface of the second magnetic pole 320 needs to be engaged with the end surface of the winding portion 110. As shown in fig. 6, the end surface of winding portion 110 is a rounded rectangle, and the bottom surface of second magnetic pillar 320 is a rounded rectangle having a size slightly smaller than the end surface of winding portion 110. The first magnetic pillar 310 and the third magnetic pillar 330 are provided with a second groove a-1 for surrounding the bobbin 100 on the side facing the second magnetic pillar 320. The second groove a-1 serves to surround the bobbin 100 after assembly. Therefore, the best solution when selecting the groove is that the second groove a-1 is matched with the winding base 120 of the bobbin 100, and after the transformer 10 is assembled, the second groove a-1 of the first magnetic pillar 310 and the second groove a-1 of the second magnetic pillar 320 form a cavity for placing the bobbin 100.

Claims

1. A transformer, the transformer includes bobbin, and by the yoke that the yoke of magnetic core upper yoke and magnetic core lower yoke are constituteed, its characterized in that, the transformer still includes:

each magnetic column is composed of a plurality of sub-magnetic columns with the same thickness, and insulating components are attached to the upper part and the lower part of each sub-magnetic column.

2. The transformer of claim 1, wherein the insulating member is an air gap sheet.

3. The transformer of claim 1, wherein the yoke comprises a yoke base, a first extending column, a second extending column and a third extending column formed by extending the core upper yoke and the core lower yoke in opposite directions;

4. The transformer of claim 3, wherein the fixing portion comprises a first groove disposed at a side of the yoke base connected to the second extension column.

5. The transformer of claim 4, wherein a trapezoidal notch is formed in a side edge of the yoke base connected to the first extending column and/or the second extending column.

6. The transformer according to any one of claims 1 to 5, wherein the bobbin comprises a winding portion and a winding base fixedly connected with two ends of the winding portion;

the winding portion is provided with a plurality of heat dissipation holes.

7. The transformer of claim 6, wherein a first side surface and a second side surface of the transformer are provided with second grooves matched with the winding base, wherein the first side surface is a side surface of the first magnetic pillar facing the second magnetic pillar, and the second side surface is a side surface of the third magnetic pillar facing the second magnetic pillar.

8. The transformer of claim 6, wherein a bottom surface of the second magnetic leg is engaged with an end surface of the winding portion.