CN209880359U

CN209880359U - Durable high-power-density high-frequency planar transformer

Info

Publication number: CN209880359U
Application number: CN201920540035.2U
Authority: CN
Inventors: 罗皓
Original assignee: Baili Electronic (dongguan) Co Ltd
Current assignee: Baili Electronic (dongguan) Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2019-12-31
Anticipated expiration: 2029-04-19

Abstract

The utility model discloses a durable high power density high frequency planar transformer, including first magnetic core, at least one PCB winding, at least one flat coil and second magnetic core, first magnetic core, PCB winding, flat coil and second magnetic core are folded together in proper order, the upper surface of PCB winding is equipped with at least one heat dissipation fin; through stacking first magnetic core, PCB winding, pancake coil and second magnetic core in proper order together, wherein be equipped with at least one heat dissipation fin at the upper surface of PCB winding, this heat dissipation fin can make PCB winding and pancake coil form the space of air convection, can improve the convection current effect of air, improves the radiating effect that the air flows to with the quick loss of a large amount of heats that transformer work produced, improve planar transformer's life, reinforcing durability.

Description

Durable high-power-density high-frequency planar transformer

Technical Field

The utility model belongs to the technical field of the transformer technique and specifically relates to indicate a durable type high power density high frequency planar transformer.

Background

The heat dissipation structure of the transformer is increasingly applied to various technical fields due to the advantages of small volume, protruding performance and reliable work. At present, the conventional transformer heat dissipation structure is roughly divided into two types: one is formed by stacking discrete components, specifically copper plates or copper foils, into specific sizes and shapes, then stacking these discrete components with specific shapes according to certain requirements to form the winding of the transformer, and finally adding a ferrite core in the center. The other is made of a multi-layer PCB board. Because the primary winding and the secondary winding of the heat radiation structure of the printed circuit board transformer adopt a plane multilayer stacked structure, and the copper foil replaces the traditional enameled wire, although the structure can fully utilize the skin effect of the conductor, reduce the eddy current loss and improve the surface conductivity of the conductor, when the structure is used in a high-power occasion, the temperature rise of the copper foil winding is very high, and the natural heat radiation effect is not good, so that the generated heat cannot be timely discharged, and the potential safety hazard is greatly existed.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to the deficiency of the prior art, and the main objective of the present invention is to provide a durable high power density high frequency planar transformer, which can effectively solve the problem that the existing transformer cannot discharge the generated heat in time and has a short service life.

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

the utility model provides a durable type high power density high frequency planar transformer, includes first magnetic core, at least one PCB winding, at least one flat coil and second magnetic core, first magnetic core, PCB winding, flat coil and second magnetic core are folded in proper order and are established together, the upper surface of PCB winding is equipped with at least one heat dissipation fin.

As a preferred embodiment: the number of the heat dissipation convex ribs is 6, and heat dissipation grooves are formed between every two adjacent heat dissipation convex ribs.

As a preferred embodiment: the PCB winding is a primary winding, and the flat coil is a secondary winding; or, the PCB winding is a secondary winding, and the flat coil is a primary winding.

As a preferred embodiment: the front surface and the rear surface of the PCB winding are provided with first conduction pins, and the outer side surface of the flat coil extends with second conduction pins.

As a preferred embodiment: the number of the PCB windings is 5, the number of the flat coils is 4, and the PCB windings and the flat coils are alternately assembled together.

As a preferred embodiment: the first magnetic core and the second magnetic core are both concavely provided with a containing groove, a positioning column is convexly arranged in the middle of the containing groove, positioning holes are concavely arranged in the middle of the flat coil and the PCB winding, and the flat coil and the PCB winding are distributed in the containing groove in an assembly mode that the positioning column penetrates through the positioning holes.

As a preferred embodiment: the PCB winding is provided with limiting lugs in the left and right sides, the containing groove is provided with limiting grooves in the left and right sides, and the limiting lugs are clamped in the limiting grooves.

Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme:

through stacking first magnetic core, PCB winding, pancake coil and second magnetic core in proper order together, wherein be equipped with at least one heat dissipation fin at the upper surface of PCB winding, this heat dissipation fin can make PCB winding and pancake coil form the space of air convection, can improve the convection current effect of air, improves the radiating effect that the air flows to with the quick loss of a large amount of heats that transformer work produced, improve planar transformer's life, reinforcing durability.

To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is an assembled perspective view of a preferred embodiment of the present invention;

FIG. 2 is an exploded view of the preferred embodiment of the present invention;

FIG. 3 is a perspective view of a PCB winding according to a preferred embodiment of the present invention;

fig. 4 is a perspective view of a second magnetic core according to a preferred embodiment of the present invention.

The attached drawings indicate the following:

10. first magnetic core 11, containing groove

12. Positioning column 13 and limiting groove

20. PCB winding 21, locating hole

22. First conduction pin 23 and limiting bump

24. Radiating convex rib 25 and radiating groove

30. Flat coil 31, second conduction pin

40. A second magnetic core.

Detailed Description

Referring to fig. 1 to 4, specific structures of the preferred embodiment of the present invention are shown, including a first magnetic core 10, a PCB winding 20, a flat coil 30 and a second magnetic core 40.

The first magnetic core 10 is arranged on the top of the planar transformer, the lower surface of the first magnetic core 10 is concavely provided with a containing groove 11, a positioning column 12 is convexly arranged in the middle of the containing groove 11, the left side and the right side of the containing groove are concavely provided with limiting grooves 13, and the positioning column 12 and the limiting grooves 13 both play a role in fixing and limiting the electrical components installed in the containing groove 11.

The PCB winding 20 is disposed below the first magnetic core 10, a positioning hole 21 is concavely disposed in the middle of the PCB winding 20, the positioning post 12 passes through the positioning hole 21 to fix the PCB winding 20 in the accommodating groove 11, and the PCB winding 20 can be manufactured by the following method: providing a metal template with a prefabricated pattern and a nonmetal insulating medium, placing the metal template in a special mold, respectively laying the nonmetal insulating medium on the upper surface and the lower surface of the metal template, and melting the nonmetal insulating medium so that the nonmetal insulating medium coats the metal template and forms a product substrate. And stacking a corresponding number of product substrates according to product requirements, and cutting the stacked product substrates to form the PCB winding 20. The relevant product substrate is further processed through a process that the user can form the final PCB winding 20 as desired by the design. Wherein, at the upper surface of PCB winding 20 through using non-metallic insulating medium to form heat dissipation fin 24, in this embodiment, this heat dissipation fin 24 quantity is 6, and the type has heat dissipation recess 25 between the adjacent heat dissipation fin 24, and this heat dissipation recess 25 can make the heat that produces in the planar transformer working process play the radiating effect through the convection air in the heat dissipation recess 25, prolongs planar transformer's life. The front surface and the rear surface of the PCB winding 20 are both provided with a first conduction pin 22, and the first conduction pin 22 can realize conduction connection between the PCB winding 20 and external electrical components. The left and right sides of the PCB winding 20 are convexly provided with the limiting protrusions 23, and the limiting protrusions 23 are clamped in the limiting grooves 13 in the accommodating groove 11, so that the PCB winding 20 can be more stably arranged in the accommodating groove 11.

The flat coil 30 is arranged below the PCB winding 20, the middle of the flat coil 30 is concavely provided with a positioning hole 21, the flat coil 30 is fixed in the accommodating groove 11 by the assembly mode that the positioning column 12 penetrates through the positioning hole 21, and the flat coil 30 is wound by adopting a flat film covered wire with a certain specific voltage-resistant grade through a narrow-side radial and wide-side axial winding process. Because the cross section of the flat coil 30 is a rectangular (square) copper wire, different from the conventional coil winding with a circular cross section, because the copper wire of the flat coil 30 is flattened, the flat coil 30 can provide a sufficiently large window filling factor by a transverse and longitudinal winding method under the same window area of the planar transformer, and therefore, the window filling factor of the planar transformer provided by the embodiment is relatively large, and the window utilization rate is high. Because the window filling factor is relatively large, and relatively, the current density of the pancake coil 30 is relatively large, the planar transformer can pass large current, the power-to-volume ratio is high, and the temperature rise of the planar transformer is relatively low. The outer side surface of the flat coil 30 extends with a second conduction pin 31, and the second conduction pin 31 can realize conduction connection between the flat coil 30 and an external electrical component.

The number of the PCB windings 20 may be one, or more than two, and the number of the flat coils 30 may be one, or more than two, so that a user can select the corresponding number of the PCB windings 20 and the flat coils 30 according to the product requirement. In this embodiment, the number of the PCB windings 20 is 5, the number of the flat coils 30 is 4, and the PCB windings 20 and the flat coils 30 are alternately assembled together. Wherein, the PCB winding 20 is a primary winding, and the flat coil 30 is a secondary winding; alternatively, the PCB winding 20 is a secondary winding and the flat coil 30 is a primary winding.

The second magnetic core 40 is disposed at the bottom of the planar transformer, the receiving groove 11 is concavely disposed on the upper surface of the second magnetic core 40, the positioning column 12 is convexly disposed in the middle of the receiving groove 11, the limiting grooves 13 are concavely disposed on the left and right sides of the receiving groove, and the positioning column 12 and the limiting grooves 13 both play a role in fixing and limiting the electrical components mounted in the receiving groove 11.

The working principle, the using method or the working process of the embodiment are detailed as follows:

power (not shown) enters from the conductive support rod, and after generating a voltage boost or a voltage drop through the primary winding and the secondary winding in the PCB winding 20 and the flat coil 30, the power is output from the first conducting pin 22 and the second conducting pin 31.

The utility model discloses a design focus lies in:

through stacking first magnetic core 10, PCB winding 20, pancake coil 30 and second magnetic core 40 in proper order together, wherein be equipped with at least one heat dissipation fin 24 at the upper surface of PCB winding 20, this heat dissipation fin 24 can make PCB winding 20 and pancake coil 30 form the space of air convection, can improve the convection effect of air, improve the radiating effect that the air flows, thereby dispel the loss fast with a large amount of heats that transformer work produced, improve planar transformer's life, the reinforcing durability.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a durable type high power density high frequency planar transformer, includes first magnetic core, at least one PCB winding, at least one flat coil and second magnetic core, first magnetic core, PCB winding, flat coil and second magnetic core stack in proper order and are established together its characterized in that: the upper surface of the PCB winding is provided with at least one heat dissipation convex rib.

2. The robust high power density high frequency planar transformer of claim 1, wherein: the number of the heat dissipation convex ribs is 6, and heat dissipation grooves are formed between every two adjacent heat dissipation convex ribs.

3. The robust high power density high frequency planar transformer of claim 1, wherein: the PCB winding is a primary winding, and the flat coil is a secondary winding; or, the PCB winding is a secondary winding, and the flat coil is a primary winding.

4. The robust high power density high frequency planar transformer of claim 1, wherein: the front surface and the rear surface of the PCB winding are provided with first conduction pins, and the outer side surface of the flat coil extends with second conduction pins.

5. The robust high power density high frequency planar transformer of claim 1, wherein: the number of the PCB windings is 5, the number of the flat coils is 4, and the PCB windings and the flat coils are alternately assembled together.

6. The robust high power density high frequency planar transformer of claim 1, wherein: the first magnetic core and the second magnetic core are both concavely provided with a containing groove, a positioning column is convexly arranged in the middle of the containing groove, positioning holes are concavely arranged in the middle of the flat coil and the PCB winding, and the flat coil and the PCB winding are distributed in the containing groove in an assembly mode that the positioning column penetrates through the positioning holes.

7. The robust high power density high frequency planar transformer of claim 6, wherein: the PCB winding is provided with limiting lugs in the left and right sides, the containing groove is provided with limiting grooves in the left and right sides, and the limiting lugs are clamped in the limiting grooves.