CN213660155U

CN213660155U - Switching power supply and power transformer thereof

Info

Publication number: CN213660155U
Application number: CN202022566821.5U
Authority: CN
Inventors: 胡雪晴; 张新芳; 李显俊
Original assignee: Shenzhen Honor Electronic Co ltd
Current assignee: Shenzhen Honor Electronic Co ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-07-09
Anticipated expiration: 2030-11-09

Abstract

The utility model discloses a switching power supply and a power transformer thereof, wherein the power transformer comprises a magnetic core, a primary winding and a secondary winding which are arranged in the magnetic core, the magnetic core comprises a central magnetic column, and the primary winding and the secondary winding are both sleeved on the periphery of the central magnetic column; the secondary winding comprises a secondary conductive piece, and the secondary conductive piece comprises a containing hole used for containing the central magnetic column and a radiating hole communicated with the containing hole. The utility model provides a switching power supply includes above-mentioned power transformer and mainboard. The utility model discloses a set up the louvre on the secondary side conductive piece, make the partial side surface of central magnetic column expose, increase its heat radiating area, thus promote the whole heat radiating efficiency of power transformer; meanwhile, a heat dissipation channel between the main board and the magnetic core in the switching power supply is widened, the wind-receiving heat dissipation area of the secondary copper sheet is enlarged, the air quantity required by safe heat balance of the transformer is correspondingly reduced under the same load, the noise is lowered, and meanwhile, the reactive loss of the whole machine is effectively reduced.

Description

Switching power supply and power transformer thereof

Technical Field

The utility model relates to a power field especially relates to a switching power supply and power transformer thereof.

Background

With the rapid development and wide application of the internet and 5G technologies, various server systems are indispensable in various industries, and the requirements of the server systems on the server switching power supplies for supplying power to the server systems are higher and higher. The server switching power supply has the advantages of small volume, high power density, higher reliability and lower cost, and the market long-term competitive advantage of the server switching power supply is higher. For a server power supply of a server, high-voltage alternating current (e.g., 220 Vac) needs to be changed into low-voltage direct current (e.g., 12V) and a main power transformer crossing a primary power transformer and a secondary power transformer is generally arranged, and the transformer is an energy conversion core of a switching power supply. The energy conversion efficiency and the stability are one of the core competitiveness of the power supply, when the power density is improved, the power output by the power supply with the same volume is correspondingly increased, the loss of the main transformer is correspondingly increased, and therefore the power output and the reliability of the power supply are directly influenced by the quality of the thermal design of the transformer. If the heat dissipation design of the transformer is unreasonable, the reliability is not over, the conversion efficiency is low if the transformer is light, and the power cost for long-term use is high; the life cycle of the product is seriously shortened, the use noise is high, and the worse result is safety accidents such as fire and the like caused by the change of the use environment condition; when the market demands for the comprehensive requirements of the server switching power supply such as improvement of power density, reduction of power supply volume, cost reduction and the like occur simultaneously, the heat dissipation design of the transformer is the most important part in each link of the whole switching power supply development, and the requirement is also a pain point in the power supply industry.

The traditional transformer and the structural design of the switching power supply comprising the transformer refer to fig. 6-7, only a containing hole 31 for containing a central magnetic column is arranged on a copper sheet winding 30, most heat accumulation of the central magnetic column can be dissipated through the copper sheet after heat conduction of the copper sheet, the heat dissipation efficiency is low, the heat dissipation area transmitted by the copper sheet is only 3mm actually, the distance between a magnetic core 40 and a mainboard 50 is only 2.9mm, and the air circulation effect in an air duct is poor due to too small gap, so that the practical output power supported by the transformer under a high-temperature environment is low, the practical use requirement cannot be met, the reliability is poor, the service life is short, and the noise is obvious.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's defect, provide a switching power supply and power transformer thereof.

The utility model provides a technical scheme that its technical problem adopted is:

the power transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are arranged in the magnetic core, the magnetic core comprises a central magnetic column, and the primary winding and the secondary winding are both sleeved on the periphery of the central magnetic column;

the secondary side winding comprises at least one secondary side conductive piece, and the secondary side conductive piece comprises a containing hole used for containing the central magnetic column and at least one heat dissipation hole communicated with the containing hole.

Preferably, the number of the heat dissipation holes is 2, the heat dissipation holes are respectively arranged on two sides of the accommodating hole and are communicated with the accommodating hole;

the accommodating hole is consistent with the shape of the central magnetic column, the radiating hole is a square hole, and at least one side of the square hole is communicated with the accommodating hole.

Preferably, the minor-side conductive member includes two pins extending in the same direction and arranged in parallel, a gap is provided between the two pins, and the extending direction of the gap is arranged in parallel to the arrangement direction of the square holes.

Preferably, the secondary winding is formed by overlapping at least two secondary conductive members with the same shape, and the at least two secondary conductive members are completely overlapped along the axial direction of the central magnetic column.

Preferably, the secondary side conductive member is a copper sheet.

Preferably, the magnetic core further includes a bottom surface disposed perpendicular to the central pillar, and the primary winding and the secondary winding in the magnetic core are both disposed parallel to the bottom surface and alternately arranged along the axial direction of the central pillar.

Preferably, the power transformer is formed by oppositely arranging two magnetic core center magnetic columns, and the primary windings and the secondary windings which are respectively arranged on the two oppositely arranged magnetic cores are symmetrically arranged one by one;

and an insulating part for isolating two adjacent primary windings or two adjacent secondary windings is also arranged between the two oppositely arranged magnetic cores, and the insulating part is sleeved on the central magnetic column and is arranged in parallel with the primary windings and/or the secondary windings.

Preferably, the primary winding is a coil.

The switching power supply comprises the power transformer and a mainboard, wherein the transformer is fixedly connected with the mainboard;

the mainboard with interval sets up between the magnetic core, the mainboard with interval between the magnetic core forms heat dissipation channel.

Preferably, the magnetic core and the mainboard are arranged in parallel at intervals, and the width of the heat dissipation channel is 6.9 mm.

The utility model discloses following beneficial effect has: the heat dissipation holes are formed in the secondary side conductive pieces, so that partial side surfaces of the central magnetic column are exposed, and the heat dissipation area of the central magnetic column is increased, the overall heat dissipation efficiency of the power transformer is improved, the service life of the transformer is prolonged, and the reliability of the transformer is improved; simultaneously, through setting up this louvre for among the switching power supply radiating passage between mainboard and the magnetic core widen, make under the same load, the required amount of wind of the safe thermal balance of transformer correspondingly reduces, makes the noise step-down, effectively reduces the reactive loss of complete machine simultaneously.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural diagram of a power transformer according to an embodiment of the present invention;

fig. 2 is a front view of a power transformer according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a secondary side conductive member according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an explosion structure of a power transformer according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a switching power supply according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a secondary winding of a conventional transformer;

fig. 7 is a schematic structural diagram of a conventional switching power supply.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The utility model provides a power transformer comprises magnetic core 11 and primary winding 12 and secondary winding 13 of locating in magnetic core 11, and wherein, magnetic core 11 includes central magnetic column 111 and bottom plate 112, and central magnetic column 111 sets up perpendicular bottom plate 112, and in some embodiments, magnetic core 11 still can include two branches locate central magnetic column 111 both sides, with central magnetic column 111 parallel arrangement's lateral wall 113 to the combination becomes "E" type magnetic core. Specifically, the utility model provides a transformer can include the magnetic core 11 of two relative settings, and its central magnetic pole 111 sets up relatively, and the relative butt setting of both sides wall 113 difference to enclose through lateral wall 113 and bottom plate 112 and synthesize into confined space all around.

The utility model discloses in, primary winding 12 and secondary winding 13 are all established peripherally at central magnetic column 111, and wherein, primary winding 12 is for the coil by the enameled wire winding, and secondary winding 13 includes a plurality of secondary electric conduction pieces 131, and a plurality of secondary electric conduction pieces 131 overlap the setting along the axis direction of central magnetic column 111 to constitute secondary winding 13.

In some embodiments, secondary side conductor 131 is a sheet-like structure having a substantially rectangular shape, but may have other shapes, and is not limited thereto. The center of the power transformer is provided with a containing hole 1311 for containing the central magnetic column 111, and a plurality of heat dissipation holes 1312 are further formed around the containing hole 1311, specifically, the heat dissipation holes 1312 are communicated with the containing hole 1311, when the central magnetic column 111 is inserted into the containing hole 1311, part of the side surface of the central magnetic column 111 is exposed through the communicated heat dissipation holes 1312, so that the heat dissipation area of the central magnetic column 111 is increased, and the heat dissipation efficiency of the power transformer is improved. In some embodiments, the shape of the receiving hole 1311 is identical to that of the central pillar 111, and the heat dissipation hole 1312 may be a square hole having at least one side communicating with the receiving hole 1311. Further, the number of the heat dissipation holes 1312 may be 2, which are respectively disposed at two sides of the accommodation hole 1311 and are both communicated with the accommodation hole 1311. Two pins 1313 extending in parallel in the same direction are further provided at one side of the sub-side conductive member 131, and the power transformer is assembled and fixed by inserting the pins 1313 into the PCB panel 15. Specifically, a gap is formed between the two leads 1313, and the arrangement direction of the two heat dissipation holes 1312 is parallel to the extending direction of the gap, so as to better improve the heat dissipation efficiency. In some embodiments, the gaps between pins 1313 are located off the centerline of the rectangle. Further, in some embodiments, the secondary conductive elements 131 are copper sheets, and three copper sheets are stacked to form a set of secondary windings 13, so that the high heat conduction and the increase of the heat dissipation area of the copper sheets are utilized to realize rapid heat dissipation.

Further, in some embodiments, the primary winding 12 and the secondary winding 13 are disposed parallel to the bottom surface of the magnetic core 11 and are alternately arranged along the axial direction of the central magnetic pillar 111, when the power transformer is formed by two oppositely disposed magnetic cores 11 being paired, the primary winding 12 and the secondary winding 13 are alternately arranged on each magnetic core 11, when the two magnetic cores 11 are paired, the primary winding 12 and the secondary winding 13 on the two magnetic cores 11 are symmetrically arranged one by one, that is, at the butt joint of the two magnetic cores 11, there are two adjacently disposed primary windings 12 or two adjacently disposed secondary windings 13, in the present invention, two adjacent primary windings 12 or two adjacent secondary windings 13 are isolated by the insulating member 14. The insulating member 14 is specifically an insulating plate, and the insulating member 14 is sleeved outside the central magnetic column 111 and is arranged in parallel with the primary winding 12 and the secondary winding 13.

The utility model provides a switching power supply, including foretell power transformer, still include mainboard 20, power transformer passes through PCB platelet 15 and mainboard 20 fixed connection, and wherein, the interval sets up between mainboard 20 and the magnetic core 11, and the interval that forms between the two is heat dissipation channel the utility model discloses in, this heat dissipation channel of array orientation perpendicular to of two preferred louvres 1312 to be located the fastest department of circulation of air with louvre 1312, and then promote power transformer's radiating efficiency. Further, the magnetic core 11 and the main board 20 are arranged at a parallel interval, and the width of a heat dissipation channel formed between the edge of the magnetic core 11 close to the main board 20 and the main board 20 is preferably 6.9mm, so that compared with the switching power supply before improvement, due to the arrangement of the heat dissipation hole 1312, the width of the heat dissipation channel is widened, the air flow amount is increased, the overall heat dissipation efficiency of the switching power supply is improved, the air volume required by the safe heat balance of the transformer is correspondingly reduced under the condition of the same load, the noise is lowered, and meanwhile, the reactive loss of the whole machine is effectively reduced.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A power transformer is characterized by comprising a magnetic core (11), a primary winding (12) and a secondary winding (13) which are arranged in the magnetic core (11), wherein the magnetic core (11) comprises a central magnetic column (111), and the primary winding (12) and the secondary winding (13) are sleeved on the periphery of the central magnetic column (111);

the secondary side winding (13) comprises at least one secondary side conductive piece (131), the secondary side conductive piece (131) comprises a containing hole (1311) used for containing the central magnetic column (111), and at least one heat dissipation hole (1312) communicated with the containing hole (1311).

2. The power transformer according to claim 1, wherein the number of the heat dissipation holes (1312) is 2, the heat dissipation holes are respectively arranged at two sides of the accommodating hole (1311), and the heat dissipation holes are communicated with the accommodating hole (1311);

the accommodating hole (1311) is consistent with the shape of the central magnetic column (111), the heat dissipation hole (1312) is a square hole, and at least one side of the square hole is communicated with the accommodating hole (1311).

3. The power transformer of claim 2, wherein the secondary side conductive member (131) comprises two pins (1313) extending in the same direction and arranged in parallel, and a gap is provided between the two pins (1313), and the extending direction of the gap is arranged in parallel to the arrangement direction of the square holes.

4. The power transformer according to claim 1, wherein said secondary winding (13) is formed by stacking at least two secondary conductive members (131) having the same shape, and at least two secondary conductive members (131) are completely overlapped in the axial direction of said central pole (111).

5. The power transformer of claim 1, wherein the secondary side conductive member (131) is a copper sheet.

6. The power transformer according to claim 2, wherein said magnetic core (11) further comprises a bottom plate (112) disposed perpendicular to said central leg (111), and said primary windings (12) and said secondary windings (13) in said magnetic core (11) are disposed parallel to said bottom plate (112) and alternate in the axial direction of said central leg (111).

7. The power transformer according to claim 6, characterized in that, said power transformer is composed of two said magnetic cores (11) with their central legs (111) arranged oppositely, and said primary windings (12) and said secondary windings (13) respectively arranged on two said magnetic cores (11) arranged oppositely are arranged symmetrically one by one;

and an insulating part (14) for isolating two adjacent primary windings (12) or two adjacent secondary windings (13) is further arranged between the two oppositely arranged magnetic cores (11), and the insulating part (14) is sleeved on the central magnetic column (111) and is arranged in parallel with the primary windings (12) and/or the secondary windings (13).

8. A power transformer according to claim 1, characterised in that the primary winding (12) is a coil.

9. A switching power supply, characterized in that it comprises a power transformer according to any one of claims 1-8, and further comprises a main board (20), said transformer being fixedly connected to said main board (20);

mainboard (20) with interval sets up between magnetic core (11), mainboard (20) with interval between magnetic core (11) forms heat dissipation channel.

10. The switching power supply according to claim 9, wherein the magnetic core (11) is spaced from and parallel to the main board (20), and the width of the heat dissipation channel is 6.9 mm.