CN215868938U - Framework of transformer and transformer - Google Patents

Abstract

The utility model relates to the field of converter design and discloses a horizontal transformer framework, which comprises two bases and a winding frame between the two bases, wherein metal pins for connecting a winding wire and an external circuit, a wire groove with a slope and a retaining wall are embedded in the two bases; the upper surface of at least one of the two bases is provided with a groove, and the bottom surface of at least one of the two bases is provided with a slot. The utility model effectively increases the electric clearance and creepage distance between the conductive parts of the transformer by arranging the groove, and can meet the requirement of the safety distance of the transformer without greatly increasing the base of the framework or wrapping adhesive paper and the like, thereby being beneficial to saving the production and material cost of the transformer and reducing the volume of the transformer.

Description

Framework of transformer and transformer

Technical Field

The utility model relates to the field of transformer design, in particular to a transformer framework.

Background

In the current switching power supply product, for an open-plate small-size switching power supply, in order to meet the design requirement of the safety distance between a primary circuit and a secondary circuit of the power supply, the electrical gaps and creepage distances between the primary circuit and the secondary circuit and between the secondary circuit and the secondary circuit need to be increased.

As shown in fig. 1, a framework structure of a horizontal type chip transformer in the prior art includes two bases 21 and 22 and a bobbin 10 disposed between the two bases 21 and 22, the bobbin 10 is horizontally provided with a central hole 11, two ends of the bobbin extend outward to form blocking pieces 151 and 152, metal pins 91 and 92 for connecting an external circuit are respectively embedded on the two bases 21 and 22, the metal pin 91 embedded on a side surface of the base 21 is used for connecting a primary circuit, the metal pin 92 embedded on a side surface of the base 22 is used for connecting a secondary circuit, and the bottoms of the two bases 21 and 22 are both provided with wire grooves 217 and 227.

In order to increase the electrical gap and creepage distance between the primary side circuit and the secondary side circuit, and between the secondary side circuit and the secondary side circuit, the general method needs to greatly increase the size of the first base 21 or the second base 22, or adopts a flying wire mode (a longer three-layer insulated wire is led out through the metal pin 92 and a wire groove to be directly used as a wire of the secondary side circuit), or needs to use an insulating tape to wrap the magnetic core, the winding and the framework for assembly. Because the sizes of the first base 21 and the second base 22 are greatly increased, the structure of the circuit board matched with the first base needs to be changed, certain cost is brought by using a flying wire insulating tape, and additional processes such as welding a wire, winding the insulating tape and the like are needed, so that certain influence is brought to the reliability of a product, and the production cost of the transformer is increased; even because of the uncontrollable precision of part of the procedures, certain production reject ratio is brought, and the production benefit is seriously influenced.

Meanwhile, in order to prevent the primary side wire and the secondary side wire from contacting with each other, a retaining wall, a sleeve, reverse-folding adhesive paper and the like are usually added at the take-up and take-up position, manual operation is needed, the automatic production of the transformer is influenced, and additional processes and cost are increased.

Therefore, there is a need for improvements in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a transformer framework, which can increase the electric clearance and creepage distance of conductive parts of a transformer, realize automatic assembly of a magnetic core and effectively prevent the mutual contact of original/secondary sides and secondary side wires.

In order to realize the purpose, the utility model is realized by the following technical scheme:

a bobbin for a transformer, comprising: the coil comprises a winding frame, two bases and metal pins which are used for connecting the two bases and embedded in the bases, wherein the winding frame is provided with a central hole, and at least one base is provided with a groove for increasing creepage distance on the side surface.

Preferably, the two bases are respectively a first base connected to the rear end of the bobbin and a second base connected to the front end of the bobbin, and the width of the second base is greater than that of the first base.

Preferably, a slot for increasing the creepage distance is formed in the left side of the bottom of the second base; the right side of the bottom of the second base is provided with a groove which penetrates through the upper surface and the lower surface of the second base.

Preferably, the bobbin is provided with two opposite blocking pieces, a first baffle plate positioned between the metal pin and the blocking pieces is arranged on the upper surface of the front end of the second base, and a second baffle plate is arranged on the left side of the second base; the slot is positioned below the second baffle.

Preferably, five retaining walls are arranged at intervals at the bottom of the second base, and a wire guide groove is formed between every two adjacent retaining walls; the retaining walls are sequentially a first retaining wall, a second retaining wall, a third retaining wall, a fourth retaining wall and a fifth retaining wall from left to right, wherein the first retaining wall, the second retaining wall, the fourth retaining wall and the front end of the fifth retaining wall are respectively provided with the metal pins, the metal pins are arranged on the second retaining wall, and the distance between the metal pins is larger than 3 mm.

Preferably, a projection of an extension line of a center line of the second retaining wall falls on the bobbin.

Preferably, the bottom of first base is equipped with five barricades, is equipped with the metallic channel between two adjacent barricades, and wherein two the scarf is seted up to the barricade, and the contained angle of scarf and wire casing horizontal plane is 10 degrees to 45 degrees.

Preferably, the groove is disposed between the bobbin and the metal pin, and a width and a depth of the groove are respectively greater than 1 mm.

Preferably, the bottom of the base is provided with a wire guide groove, one end of the wire guide groove close to the winding frame is provided with an inclined plane, and the included angle between the inclined plane and the horizontal plane is 10-45 degrees.

The utility model also provides a transformer which comprises the framework of the transformer, a magnetic core arranged in the central hole of the winding frame and a winding wound on the winding frame.

Preferably, the supporting table is 0.1-1mm higher than the pin welding surface.

Due to the application of the technical scheme, the transformer framework has the beneficial effects that:

(1) the baffle and the groove are arranged on the upper surface of the base, so that the electric gaps and creepage distances among the primary/secondary side conductive parts of the transformer and between the primary/secondary side conductive parts of the transformer and the conductive parts of the isolation circuit of the transformer are effectively increased, and the whole size of the framework base of the transformer does not need to be greatly increased or the safety requirements are met by using a flying wire process mode;

(2) the creepage distance between the primary/secondary side conductive parts of the transformer and the conductive parts of the isolation circuit is effectively increased through the groove arranged on the left side of the bottom of the second base, and the climbing between the primary/secondary side conductive parts of the transformer along the transformer framework can be prevented when the transformer is installed on a circuit board, so that the creepage distance between the primary/secondary side conductive parts of the transformer is increased;

(3) the bottom of the base is provided with a wire groove with a slope, when the wire is taken up, the wire can be tightly attached to the slope of the slope, the original/secondary wire can be effectively separated, the wire among windings is prevented from being in cross contact, and the safety requirement is met;

(4) the retaining walls among the wire guide grooves are provided with inclined planes, and the take-up wires are drawn towards the middle, so that the wires are prevented from being in cross contact with the retaining walls on the left side and the right side of the central column, and the safety requirements are met; secondly, the wire can be prevented from being pulled out of the winding frame to influence the automatic assembly of the magnetic core;

(5) because the projection of the extension line of the central line of the second retaining wall falls on the winding frame, namely, the wire groove formed between the first retaining wall and the second retaining wall is close to the winding frame, so that the crossing situation between the primary winding and the secondary winding of the transformer can not occur during winding, the potential safety hazard is avoided, and the safety requirement is met.

Drawings

Fig. 1 is a perspective view of a bobbin of a conventional horizontal patch transformer;

FIG. 2 is a perspective view of the inventive transformer bobbin;

FIG. 3 is a perspective view of another perspective of the inventive bobbin;

FIG. 4 is a perspective view of a transformer bobbin of the present invention from yet another perspective;

fig. 5 is a perspective view of the transformer bobbin of the present invention applied to a transformer and combined with a circuit board.

Detailed Description

The utility model is described in further detail below with reference to the following figures and specific examples:

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Referring to fig. 2 to 4, the present invention provides a transformer bobbin for use in a transformer.

In this embodiment, the transformer bobbin is a bobbin used in a horizontal patch transformer, and includes a first base 21, a second base 22, and a bobbin 10 disposed between the first base 21 and the second base 22, wherein the first base 21 is connected to a rear end of the bobbin 10, the second base 22 is connected to a front end of the bobbin 10, the bobbin 10 is horizontally provided with a central hole 11 for mounting a magnetic core, two ends of the bobbin 10 extend outward to form blocking pieces 151 and 152, a width of the second base 22 is greater than that of the first base 21, wherein a metal pin 91 for connecting a primary side circuit of the transformer is embedded in the first base 21, a metal pin 92 for connecting a secondary side circuit of the transformer is embedded in the second base 22, a first baffle 221 is disposed on an upper surface of the front end of the second base 22 between an end having a pin embedding surface and the blocking piece 152 of the bobbin, a second baffle 22b is disposed on a left side of the second base 22, the right side of the second base 22 is provided with a groove 23 penetrating through the upper and lower surfaces of the second base 22, wherein the length and width of the groove 23 is 3 x 1.5 mm.

In this embodiment, by providing the groove 23, the electrical gap and the creepage distance between the conductive parts of the primary/secondary circuit of the transformer and the conductive parts of the isolation circuit thereof can be effectively increased. In addition, the first baffle 221 and the second baffle 22b are connected to form a two-sided surrounding valley structure, so that the primary-side magnetic core 56 can be separated from the metal pin embedding surface of the second base 22 and the conductive parts of the secondary-side circuit by a certain creepage distance in the height direction of the two surfaces. The first and second shutters 221 and 22b have a thickness, are disposed at the edge of the second base 22, and are flush with the outer edge of the second base 22, the first shutter 221 is parallel to the shutter 152, and the second shutter 22b is perpendicular to the first shutter 221. In order to facilitate automatic assembly of the magnetic core, the height of the first baffle 221 is 1.2 mm; secondly, in order to deal with the situation that the conductive parts of the secondary circuit exist at the lower side surface position of the transformer, the electrical clearance and the creepage distance between the conductive parts of the secondary circuit and the conductive parts of the primary circuit of the transformer are ensured to be enough to meet the safety regulation requirement, the height of the second baffle plate 22b is equal to that of the baffle plate 152, and meanwhile, the second baffle plate 22b also plays a role in supporting the lower side surface of the transformer.

As shown in fig. 3, the bottom of the first base 21 is provided with 5 retaining walls 32b arranged at intervals, a wire guiding groove 217 with a slope is arranged between two adjacent retaining walls 32b, and an included angle between an inclined surface of the slope and a horizontal plane is 10 degrees to 45 degrees. In addition, two retaining walls 32b in the first base 21 are provided with chamfered surfaces 32a, and the included angle between the chamfered surfaces 32a and the horizontal plane of the wire guide groove 217 is 10 degrees to 45 degrees.

The bottom of the second base 22 is provided with 5 retaining walls 33b arranged at intervals, and a wire guide groove 218 with a slope is arranged between two adjacent retaining walls 33 b; the five retaining walls 33b are a first retaining wall 331, a second retaining wall 332, a third retaining wall 333, a fourth retaining wall 334 and a fifth retaining wall 335 in sequence from left to right, wherein the width of the third retaining wall 333 is 2.3mm, and the width of the third retaining wall 333 is greater than the width of the second retaining wall 332 and the fourth retaining wall 334. The first retaining wall 331 is provided with a slot 223b for increasing creepage distance below the second baffle 22b, and the length, width and height of the slot 223b are 4 × 1.5 mm; the projection of the extension line of the center line of the second wall 332 falls on the bobbin 10, so that the wire groove 218 formed between the first wall 331 and the second wall 332 is close to the bobbin 10, and thus, no crossing occurs between the primary winding and the secondary winding of the transformer during winding.

In this embodiment, the metal pins 92 are respectively mounted on the front ends of the first retaining wall 331, the second retaining wall 332, the fourth retaining wall 334 and the fifth retaining wall 335, wherein the metal pins 92 mounted on the first retaining wall 331 and the second retaining wall 332 are defined as a first pin assembly 92 a; the metal pins 92 mounted on the fourth wall 334 and the fifth wall 335 are defined as a second pin combination 92b, and the first pin combination 92a and the second pin combination 92b correspond to different output windings, respectively, wherein the distance between the metal pins 92 mounted on the second wall 332 and the metal pins 92 mounted on the fourth wall 334 is 6 mm.

The above preferred embodiments are designed to meet the requirements of electrical clearance and creepage distance between the magnetic core of the transformer and the conductive parts of the primary/secondary side circuit, and according to the technical idea of the present invention, in order to meet the requirements of the transformer for electrical clearance and creepage distance under different conditions, the present invention can be changed in several ways, for example as follows:

for the case that the electrical gap and the creepage distance between the transformer core and the conductive component of the primary circuit, and between the transformer core and the conductive component of the secondary circuit need to be increased at the same time, the groove 23 and the first and second baffles 221 and 22b may be arranged on the upper surfaces of the first base 21 and the second base 22 at the same time, and the number and the positions of the groove 23 and the first and second baffles 221 and 22b may be changed according to the practical application. In this case, the arrangement and principle of the groove 23 and the first and second shutters 221 and 22b are the same as those of the above preferred embodiment, and are not described again here.

In order to meet the requirements of different safety distance between the primary side and the secondary side and between the outputs, the width of the second base 22, the heights of the first baffle plate 221 and the second baffle plate 22b, the length and the width of the groove 23 and the length and the width of the third baffle wall 333 can be increased in a small range.

Compared with the prior art, the utility model has the following beneficial effects:

(1) the shortest space distance and the shortest insulation surface path between the magnetic core of the transformer and the conductive parts of the secondary circuit are increased through the first baffle 221, the second baffle 22b and the groove 23 on the second base 22, so that the requirements of the electrical gap and the creepage distance between the magnetic core of the transformer and the conductive parts of the secondary circuit can be met, and the requirements of the electrical gap and the creepage distance between the magnetic core of the transformer and the conductive parts of the secondary circuit are avoided by coating an insulation tape on the outer part of the magnetic core;

(2) on the left side of the bottom of the second base 22 in this embodiment, a slot 223b with a length, width and height of 4 × 1.5mm is provided below the retaining wall 22b, so as to prevent the conductive parts of the primary/secondary circuit from climbing along the framework of the converter. As shown in fig. 5, the creepage distance between the primary/secondary side pins is increased by matching with the same position slot 223c (refer to fig. 5) of the PCB;

(3) since the projection of the extension line of the center line of the second retaining wall 332 falls on the bobbin 10, that is, the wire groove 218 formed between the first retaining wall 331 and the second retaining wall 332 is close to the bobbin 10, the crossing between the primary winding and the secondary winding of the transformer can not occur during winding, so as to avoid potential safety hazard and meet the safety regulation requirement;

(4) in this embodiment, the bottom portions of the first base 21 and the second base 22 are respectively provided with a wire guiding groove 217 and 218 with slopes, the wire guiding grooves 217 and 218 are formed by connecting three slopes with different inclinations, and from the connection position with the bobbin 10, the inclination angle of the slope is smaller and smaller, so that the connection strength between the first base 21 and the second base 22 and the bobbin 10 and the thickness of the pin embedding surface are ensured while the safety regulation is improved;

(5) in the embodiment, the bottom of the first base 21 is provided with a retaining wall 32b with a chamfer surface 32a, and the winding wires are drawn to the middle to prevent the wires from leaking on the retaining walls on the left side and the right side of the winding frame 10, so that the wires are in cross contact with the windings behind, and the safety requirements are met;

(6) the first pin combination 92a and the second pin combination 92b on the second base 22 are respectively arranged on two sides, and the width of the third retaining wall 333 is widened, so that the situation that the overall size of the first base 21 and the second base 22 of the transformer framework is greatly increased or the safety requirement of an output room is met by using a flying wire process mode is avoided, the material cost and the working hour cost are reduced, the reliability and the consistency are improved, and the production efficiency is improved; in addition, the third baffle wall 333 is widened from 1.5mm to 2.3mm, so that the winding positions of the two inter-winding paths are effectively prevented from being close to each other, and safety regulations are prevented from being influenced;

(7) through the wire grooves 217 and 218 with the slopes at the bottoms of the first base 21 and the second base 22, the three layers of insulated wires are led out after the transformer is wound and directly wound on the metal pins 91 and 92 and are welded together with the metal pins, and no three layers of insulated wires are led out for wire flying processing, so that the process difficulty is reduced, and the welding reliability is enhanced.

The embodiments of the present invention are not limited thereto, and various other modifications, substitutions or alterations can be made to the present invention in light of the above basic technical ideas of the present invention and the common technical knowledge and conventional means in the field of the present invention within the scope of the present invention.

Claims (10)

1. A bobbin for a transformer, comprising: bobbin, two bases, connection two the base and inlay and adorn in the metal pin of base, the bobbin is equipped with centre bore, its characterized in that: at least one base is provided with a groove used for increasing creepage distance on the side surface.

2. The transformer backbone of claim 1, wherein: the two bases are respectively a first base connected to the rear end of the winding frame and a second base connected to the front end of the winding frame, and the width of the second base is larger than that of the first base.

3. The transformer backbone of claim 2, wherein: a slot for increasing the creepage distance is formed in the left side of the second base; the right side of the second base is provided with a groove which penetrates through the upper surface and the lower surface of the second base.

4. The transformer backbone of claim 3, wherein: the bobbin is provided with two opposite blocking pieces, a first baffle plate positioned between the metal pin and the blocking pieces is arranged on the upper surface of the front end of the second base, and a second baffle plate is arranged on the left side of the second base; the slot is positioned below the second baffle.

5. The transformer backbone of claim 2, wherein: five retaining walls which are arranged at intervals are arranged at the bottom of the second base, and a wire guide groove is arranged between every two adjacent retaining walls; the retaining walls are sequentially a first retaining wall, a second retaining wall, a third retaining wall, a fourth retaining wall and a fifth retaining wall from left to right, wherein the first retaining wall, the second retaining wall, the fourth retaining wall and the front end of the fifth retaining wall are respectively provided with the metal pins, the metal pins are arranged on the second retaining wall, and the distance between the metal pins is larger than 3 mm.

6. The transformer backbone of claim 5, wherein: and the projection of the extension line of the central line of the second retaining wall is located on the winding frame.

7. The transformer backbone of claim 2, wherein: the bottom of first base is equipped with five barricades, is equipped with the metallic channel between two adjacent barricades, and wherein two the scarf is seted up to the barricade, and the contained angle of scarf and wire casing horizontal plane is 10 degrees to 45 degrees.

8. The transformer backbone of claim 1, wherein: the groove is arranged between the winding frame and the metal pin, and the width and the depth of the groove are respectively larger than 1 millimeter.

9. The transformer backbone of claim 1, wherein: the bottom of the base is provided with a wire groove, one end of the wire groove close to the winding frame is provided with a slope, and the included angle between the inclined plane of the slope and the horizontal plane is 10-45 degrees.

10. A transformer, characterized by: comprising a bobbin of a transformer according to any one of claims 1 to 9, a magnetic core mounted in a central hole of the bobbin, and a winding wound on the bobbin.

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