CN209880359U - Rugged High Power Density High Frequency Planar Transformer - Google Patents

Abstract

The utility model discloses a durable high-power density high-frequency planar transformer, comprising a first magnetic core, at least one PCB winding, at least one flat coil and a second magnetic core, wherein the first magnetic core, the PCB winding, the flat coil and the second magnetic core are stacked together in sequence, and at least one heat dissipation rib is provided on the upper surface of the PCB winding; by stacking the first magnetic core, the PCB winding, the flat coil and the second magnetic core together in sequence, wherein at least one heat dissipation rib is provided on the upper surface of the PCB winding, the heat dissipation rib can form a space with air convection between the PCB winding and the flat coil, thereby improving the convection effect of the air and the heat dissipation effect of the air flow, thereby quickly dissipating a large amount of heat generated by the transformer during operation, thereby improving the service life of the planar transformer and enhancing durability.

Description

Rugged High Power Density High Frequency Planar Transformer

technical field

The utility model relates to the technology in the field of transformers, in particular to a durable high-power-density high-frequency planar transformer.

Background technique

Transformer heat dissipation structure is more and more used in various technical fields because of its small size, outstanding performance and reliable operation. At present, the traditional heat dissipation structure of transformers can be roughly divided into two categories: one is stacked with discrete components, specifically, copper plates or copper foils are processed into special sizes and shapes, and then these discrete components with special shapes are processed according to a certain The requirements are stacked to form the winding of the transformer, and finally a ferrite core is added in its center. The other type is made of multi-layer PCB boards. Since the primary and secondary windings of the printed circuit board transformer heat dissipation structure adopt a planar multi-layer stacked structure, copper foil is used to replace the traditional enameled wire. Although this structure can make full use of the skin effect of the conductor, reduce the eddy current loss and improve the surface of the conductor. Conductive performance, but when it is used in high-power occasions, the temperature rise of its copper foil winding will be high, and the effect of natural heat dissipation through it is not good, resulting in the inability to discharge the generated heat in time, posing a great safety hazard.

Utility model content

In view of this, the utility model aims at the deficiencies of the existing technology, and its main purpose is to provide a durable high-power-density high-frequency planar transformer, which can effectively solve the problem that the existing transformer cannot discharge and use the heat generated in time The problem of short life.

In order to achieve the above object, the utility model adopts the following technical solutions:

A durable high-power-density high-frequency planar transformer, comprising a first magnetic core, at least one PCB winding, at least one flat coil and a second magnetic core, the first magnetic core, PCB winding, flat coil and second magnetic core Stacked together in sequence, the upper surface of the PCB winding is provided with at least one heat dissipation rib.

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

As a preferred solution: 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 solution: both the front surface and the rear surface of the PCB winding are provided with first conduction pins, and the outer surface of the flat coil is extended with second conduction pins.

As a preferred solution: 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 assembled together alternately.

As a preferred solution: both the first magnetic core and the second magnetic core are concavely provided with an accommodating groove, and a positioning post is protruded in the middle of the accommodating groove, and the middle of the aforementioned flat coil and PCB winding is concavely provided with The positioning hole, the positioning column passes through the positioning hole to transfer the flat coil and the PCB winding into the accommodating groove.

As a preferred solution: the left and right sides of the PCB winding are protrudingly provided with limiting protrusions, and the left and right sides of the aforementioned accommodating groove are correspondingly provided with limiting grooves, and the limiting protrusions are engaged in the limiting grooves.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be known from the above technical solutions:

By stacking the first magnetic core, the PCB winding, the flat coil and the second magnetic core in sequence, at least one heat dissipation rib is provided on the upper surface of the PCB winding, and the heat dissipation rib can make the PCB winding and the flat coil form a There is space for air convection, which can improve the convection effect of the air and the heat dissipation effect of the air flow, so that the large amount of heat generated by the transformer can be quickly dissipated, and the service life of the planar transformer can be improved, and the durability can be enhanced.

In order to illustrate the structural features and functions of the utility model more clearly, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the assembled three-dimensional schematic diagram of the preferred embodiment of the present utility model;

Fig. 2 is the exploded view of the preferred embodiment of the utility model;

Fig. 3 is the three-dimensional schematic diagram of the PCB winding of the preferred embodiment of the present invention;

FIG. 4 is a three-dimensional schematic diagram of a second magnetic core in a preferred embodiment of the present invention.

Explanation of the accompanying drawings:

10. First magnetic core 11. Accommodating slot

12. Positioning column 13. Limiting groove

20. PCB winding 21. Positioning hole

22. The first conduction pin 23. Limit bump

24. Heat dissipation ribs 25. Heat dissipation grooves

30. Flat coil 31. Second conduction pin

40. The second magnetic core.

Detailed ways

Please refer to FIG. 1 to FIG. 4 , which show the specific structure of a preferred embodiment of the present invention, 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 an accommodating groove 11, and the middle of the accommodating groove 11 is protruded with a positioning post 12, and the accommodating groove Limiting grooves 13 are recessed on the left and right sides, and both the positioning column 12 and the limiting groove 13 have the effect of fixing and limiting the electrical components installed in the accommodating groove 11 .

The PCB winding 20 is arranged below the first magnetic core 10, and a positioning hole 21 is recessed in the middle of the PCB winding 20, and the aforementioned positioning column 12 passes through the positioning hole 21 to fix the PCB winding 20 in the accommodating groove 11, The PCB winding 20 can be produced by the following method: provide a metal template with prefabricated graphics and a non-metallic insulating medium, place the metal template in a special mold, and lay the non-metallic insulating medium on the upper and lower sides of the metal template respectively, and melt the non-metallic insulating medium. Metal insulating medium, so that the non-metallic insulating medium covers the metal template and forms the product substrate. According to product requirements, a corresponding number of product substrates are stacked, and the stacked corresponding number of product substrates are cut to form the PCB winding 20 . The relevant product substrates are further processed through the process, and the user can form the final PCB winding 20 according to the design requirements. Wherein, the heat dissipation ribs 24 are formed on the upper surface of the PCB winding 20 by using a non-metallic insulating medium. Groove 25, the heat dissipation groove 25 can make the heat generated in the working process of the planar transformer play a cooling effect through the convective air in the heat dissipation groove 25, prolonging the service life of the planar transformer. Both the front surface and the rear surface of the PCB winding 20 are provided with first conduction pins 22 , and the first conduction pins 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 protruded with limiting protrusions 23, and the limiting protrusions 23 are engaged with the limiting grooves 13 in the aforementioned accommodating grooves 11, so that the PCB winding 20 can be more firmly arranged in the accommodating in slot 11.

The flat coil 30 is arranged below the PCB winding 20, and a positioning hole 21 is recessed in the middle of the flat coil 30. The aforementioned positioning column 12 passes through the positioning hole 21 to fix the flat coil 30 in the accommodating groove 11. 30 is made of a flat film-covered wire of a certain pressure resistance level, which is wound through narrow-side radial and wide-side axial winding processes. Since the cross section of the flat coil 30 is a rectangular (square) copper wire, which is different from the traditional coil winding with a circular cross section, due to the flattening of the copper wire of the flat coil 30, under the same window area of the planar transformer, through the horizontal and The flat coil 30 can provide a sufficiently large window filling factor by the winding method in two longitudinal directions. Therefore, the window filling factor of the planar transformer provided in this embodiment is relatively large, and the window utilization rate is large. Because the window filling factor is relatively large, the current density of the flat coil 30 is relatively large, so the planar transformer can pass a large current, the power volume ratio is high, and the temperature rise of the planar transformer is relatively low. The outer surface of the flat coil 30 is extended with a second conduction pin 31 , and the second conduction pin 31 can realize conduction connection between the flat coil 30 and external electrical components.

The number of the PCB winding 20 can be one, or more than two, and the number of the flat coil 30 can be one, or more than two, and the user can choose the corresponding number of PCB windings 20 and flat coils according to product requirements. 30. In this embodiment, the number of the PCB windings 20 is five, and the number of the flat coils 30 is four, and the PCB windings 20 and the flat coils 30 are assembled together alternately. Wherein, the PCB winding 20 is a primary winding, and the flat coil 30 is a secondary winding; or, the PCB winding 20 is a secondary winding, and the flat coil 30 is a primary winding.

The second magnetic core 40 is arranged at the bottom of the planar transformer. The upper surface of the second magnetic core 40 is concavely provided with an accommodating groove 11, and the middle of the accommodating groove 11 is protruded with a positioning column 12. Limiting grooves 13 are recessed on the left and right sides, and both the positioning column 12 and the limiting groove 13 have the effect of fixing and limiting the electrical components installed in the accommodating groove 11 .

The working principle, method of use or working process of the present embodiment are described in detail as follows:

The power supply (not shown in the figure) enters from the conductive support rod, passes through the primary winding and the secondary winding in the PCB winding 20 and the flat coil 30, and generates a boost or a step-down, from the first conduction pin 22 and the second conduction pin output via pin 31.

The design focus of the present utility model is:

By stacking the first magnetic core 10, the PCB winding 20, the flat coil 30 and the second magnetic core 40 together sequentially, wherein at least one heat dissipation rib 24 is arranged on the upper surface of the PCB winding 20, the heat dissipation rib 24 can Make the PCB winding 20 and the flat coil 30 form a space for air convection, which can improve the convection effect of the air, improve the heat dissipation effect of the air flow, and quickly dissipate a large amount of heat generated by the transformer, improve the service life of the planar transformer, and enhance durability sex.

The above are only preferred embodiments of the present utility model, and do not limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model , all still belong to the scope of the technical solution of the utility model.

Claims (7)

1. A durable high-power-density high-frequency planar transformer, comprising a first magnetic core, at least one PCB winding, at least one flat coil and a second magnetic core, the first magnetic core, PCB winding, flat coil and second The magnetic cores are stacked together in sequence, and the feature is that: at least one heat dissipation rib is provided on the upper surface of the PCB winding. 2. The durable high power density high frequency planar transformer according to claim 1, characterized in that: the number of the heat dissipation ribs is 6, and heat dissipation grooves are formed between adjacent heat dissipation ribs. 3. The durable high-power-density high-frequency planar transformer according to claim 1, characterized in that: the PCB winding is a primary winding, and the flat coil is a secondary winding; or, the PCB winding is a secondary winding , the flat coil is the primary winding. 4. The durable high-power-density high-frequency planar transformer according to claim 1, characterized in that: the front surface and the rear surface of the PCB winding are provided with first conduction pins, and the outer surface of the flat coil Extended with a second conduction pin. 5. The durable high-power-density high-frequency planar transformer according to claim 1, characterized in that: 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 on Together. 6. The durable high power density high frequency planar transformer according to claim 1, characterized in that: a receiving groove is recessed in the first magnetic core and the second magnetic core, and the middle of the receiving groove A positioning column is provided on the convex side, and a positioning hole is concavely provided in the middle of the flat coil and the PCB winding. The positioning column passes through the positioning hole to transfer the flat coil and the PCB winding into the accommodating groove. 7. The durable high-power density high-frequency planar transformer according to claim 6, characterized in that: the left and right sides of the PCB winding are protrudingly provided with limiting bumps, and the left and right sides of the aforesaid accommodating grooves are correspondingly provided with limiting Groove, the limiting protrusion is engaged in the limiting groove.