CN215527401U

CN215527401U - Planar transformer

Info

Publication number: CN215527401U
Application number: CN202121886974.6U
Authority: CN
Inventors: 廖忠明; 李明康
Original assignee: Anker Innovations Co Ltd
Current assignee: Anker Innovations Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2022-01-14
Anticipated expiration: 2031-08-12

Abstract

The utility model relates to the technical field of transformers, in particular to a planar transformer, which comprises: the first magnetic core is convexly provided with a first contact end; the second magnetic core is convexly provided with a second contact end which is in plug-in fit with the first contact end; the printed circuit board is provided with two mounting holes for the second contact end to penetrate through, wherein a primary winding is formed on the periphery of one mounting hole, and a PFC inductance coil is formed on the periphery of the other mounting hole; a secondary winding mounted above the primary winding; the first contact end of the first magnetic core sequentially penetrates through the secondary winding and the mounting hole of the printed circuit board and is connected with the second contact end of the second magnetic core; according to the method and the device, the primary winding and the PFC inductance coil are integrated on the same printed circuit board, so that the product space is effectively saved, and the product power density is improved.

Description

Planar transformer

Technical Field

The utility model relates to the technical field of transformers, in particular to a planar transformer.

Background

With the development requirements of miniaturization and high-power density power supplies, the application scene of the planar transformer technology that uses a printed circuit board to replace the traditional winding type transformer is more and more extensive; the application of the planar transformer is greatly improved and improved from the aspects of improving the power density, the automation degree and the EMI consistency of products.

With the further improvement of the Charging output power, in order to meet the harmonic wave requirement of a product, a PFC inductance coil is required to be used for design; in the planar transformer in the prior art, a two-way separator is generally adopted for implementation, and specifically, a PFC inductance coil and a primary winding in the planar transformer in the prior art are independently arranged, so that the formed planar transformer is large in structure and occupies a large space when in use.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a planar transformer to solve the great technical problem of planar transformer occupation space among the prior art.

Technical scheme (I)

To achieve the above object, the present invention provides a planar transformer, comprising:

the first magnetic core is convexly provided with a first contact end;

the second magnetic core is convexly provided with a second contact end which is in plug-in fit with the first contact end;

the printed circuit board is provided with two mounting holes for the second contact end to penetrate through, wherein a primary winding is formed on the periphery of one mounting hole, and a PFC inductance coil is formed on the periphery of the other mounting hole;

a secondary winding mounted above the primary winding;

and the first contact end of the first magnetic core sequentially penetrates through the secondary winding and the mounting hole of the printed circuit board and is connected with the second contact end of the second magnetic core.

As one of the alternatives of the present technical solution, the secondary winding includes: at least one insulated coil concentrically disposed with the mounting hole.

As one of the alternatives of the present technical solution, the primary winding includes: the primary coil, the auxiliary coil and the electromagnetic interference compensation coil are arranged in a stacked mode and are respectively installed on different layers of the printed circuit board.

As one alternative of this technical solution, both ends of the second magnetic core are bent in a direction approaching the printed circuit board to form a mounting cavity for accommodating the printed circuit board.

As one of the alternatives of the present invention, the first magnetic core has the same structure as the second magnetic core.

As one of the alternatives of this technical solution, the first magnetic core is configured to be a flat plate structure, and after the first magnetic core is assembled with the second magnetic core, two ends of the first magnetic core are respectively abutted to the bending portion of the second magnetic core.

As one alternative of the present technical solution, the first magnetic core and the second magnetic core are detachably connected through a mounting structure.

As one of the alternatives of the present technical solution, the mounting structure includes: first installed part and the second installed part of matched with, first installed part and second installed part one set up in on the first magnetic core, the other set up in on the second magnetic core.

As one of the alternatives of the present technical solution, one of the first mounting part and the second mounting part is provided as a snap, and the other is provided as a slot matched with the snap.

As one alternative of this technical solution, a heat dissipation structure is further mounted on the first magnetic core and the second magnetic core.

(II) advantageous effects

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

the present invention provides a planar transformer, comprising: the first magnetic core is convexly provided with a first contact end; the second magnetic core is convexly provided with a second contact end which is in plug-in fit with the first contact end; the printed circuit board is provided with two mounting holes for the second contact end to penetrate through, wherein a primary winding is formed on the periphery of one mounting hole, and a PFC inductance coil is formed on the periphery of the other mounting hole; a secondary winding mounted above the primary winding; the first contact end of the first magnetic core sequentially penetrates through the secondary winding and the mounting hole of the printed circuit board and is connected with the second contact end of the second magnetic core; according to the method and the device, the primary winding and the PFC inductance coil are integrated on the same printed circuit board, so that the product space is effectively saved, and the product power density is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for a person skilled in the art that other drawings can be obtained according to the drawings without inventive exercise, wherein:

FIG. 1 is an exploded view of a planar transformer according to the present invention;

fig. 2 is a schematic diagram of the structure of the secondary winding in the present invention.

In the figure: 1. a first magnetic core; 2. a first contact end; 3. a second magnetic core; 4. a second contact end; 5. a printed wiring board; 6. mounting holes; 7. a secondary winding.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

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

in order to solve the above technical problem, as shown in fig. 1 and 2, the present application provides a planar transformer, including:

the first magnetic core 1 is convexly provided with a first contact end 2;

the second magnetic core 3 is convexly provided with a second contact end 4 which is in plug-in fit with the first contact end 2;

specifically, the number of the first contact end 2 and the second contact end 4 is two; the first contact end 2 and the second contact end 4 are pins which are in plug-in fit; further, in order to ensure a stable connection between the first contact end 2 and the second contact end 4, it is preferable in this embodiment to provide the first contact end 2 and the second contact end 4 with a matching cylindrical structure.

In addition, the first magnetic core 1 or the second magnetic core 3 in the present embodiment may be made of a magnetic metal oxide composed of an iron oxide mixture; for example, the first magnetic core 1 or the second magnetic core 3 may be made of manganese-zinc ferrite or nickel-zinc ferrite.

A printed circuit board 5, which is formed with two mounting holes 6 for the second contact terminal 4 to pass through, wherein the periphery of one mounting hole 6 forms a primary winding, and the periphery of the other mounting hole 6 forms a PFC inductance coil;

in a particular embodiment, the primary winding comprises: the primary coil, the auxiliary coil and the electromagnetic interference compensation coil are arranged in a stacked mode and are respectively arranged on different layers of the printed circuit board 5; specifically, the primary coil, the auxiliary coil, and the electromagnetic interference compensation coil are concentrically disposed with the mounting hole 6.

A secondary winding 7 mounted above the primary winding; specifically, the secondary winding 7 is concentrically disposed with the mounting hole 6, so as to ensure that the first contact end 2 or the second contact end 4 can smoothly pass through the secondary winding 7 and the mounting hole 6 in sequence.

During assembly, the first contact end 2 of the first magnetic core 1 sequentially penetrates through the secondary winding 7 and the mounting hole 6 of the printed circuit board 5 and is connected with the second contact end 4 of the second magnetic core 3; in conclusion, the primary winding and the PFC inductance coil are integrated on the same printed circuit board 5, so that the space which originally needs two devices is realized by one device, the product space is effectively saved, and the product power density is improved; illustratively, 100W of power output can be realized through 65W of structural space, specifically, taking 65W as an example, the power density is improved from 0.857W/cm3 to 1.26W/cm 3; in addition, because the primary winding and the PFC inductance coil both belong to the primary winding, the design of the embodiment does not need safety regulation isolation.

According to one embodiment of the utility model, the secondary winding 7 comprises: at least one insulating coil concentrically arranged with the mounting hole 6, preferably, the number of the insulating coils is three, and the three insulating coils are concentrically arranged, wherein the number of the insulating coils is not specifically limited in this embodiment, and is specifically designed in advance according to needs.

In a specific embodiment, as shown in fig. 1, the structure of the first magnetic core 1 is the same as that of the second magnetic core 3, and two ends of the second magnetic core 3 are bent toward the direction close to the printed circuit board 5 to form a mounting cavity for accommodating the printed circuit board 5, when assembling, firstly, the secondary winding 7 and the printed circuit board 5 are sequentially sleeved on the second contact end 4 until the printed circuit board 5 is mounted in the mounting cavity, at this time, part of the second contact end 4 is exposed from the mounting hole 6, and then, only the first contact end 2 is connected with the second contact end 4, so as to achieve magnetic communication between the first magnetic core 1 and the second magnetic core 3; at this time, the bending part of the first magnetic core 1 is abutted with the bending part of the second magnetic core 3; of course, in order to ensure the stability of the connection between the first magnetic core 1 and the second magnetic core 3, it is preferable that the two bent portions are fixedly connected, and for example, an adhesive or the like may be used.

In another specific embodiment, the structure of the first magnetic core 1 is different from that of the second magnetic core 3, the first magnetic core 1 is configured as a flat plate structure, and two ends of the second magnetic core 3 are bent towards the direction close to the printed circuit board 5 to form a mounting cavity for accommodating the printed circuit board 5; after the first magnetic core 1 and the second magnetic core 3 are assembled, two ends of the first magnetic core 1 are respectively abutted against the bending part of the second magnetic core 3; specifically, the height of the first contact end 2 after the first contact end 4 is in plug-in fit with the height of the mounting cavity is the same as the height of the mounting cavity, so that the size of the planar transformer is further reduced.

According to an embodiment of the present invention, in order to facilitate maintenance and replacement of the planar transformer, the first magnetic core 1 and the second magnetic core 3 are preferably detachably connected through a mounting structure; specifically, the mounting structure includes: the magnetic core comprises a first magnetic core 1, a second magnetic core 3 and a first mounting part and a second mounting part which are matched with each other, wherein one of the first mounting part and the second mounting part is arranged on the first magnetic core 1, and the other one of the first mounting part and the second mounting part is arranged on the second magnetic core 3; exemplarily, the first mounting part is mounted on the bent part of the first magnetic core 1 and is configured as a snap; second installed part is installed on the kink of second magnetic core 3, and set up to the draw-in groove, during the assembly, can realize dismantling of first magnetic core 1 and second magnetic core 3 through the cooperation of draw-in groove and buckle and be connected, of course, in this embodiment, the cooperation of dismantling of first magnetic core 1 and second magnetic core 3 is not limited to the cooperation of above-mentioned buckle and draw-in groove, exemplarily, can also adopt the cooperation of spout and slide rail, to sum up, do not prescribe a limit to mounting structure's concrete structure in this embodiment, as long as can realize the structure of dismantling the connection of first magnetic core 1 and second magnetic core 3 all is applicable to in this embodiment, all belong to the protection scope of this embodiment.

According to one embodiment of the present invention, the first magnetic core 1 and the second magnetic core 3 are further mounted with heat dissipation structures; specifically, one of the heat dissipation structures is mounted on the wall surface of the first magnetic core 1 far away from the first contact end 2, and the other heat dissipation structure is mounted on the wall surface of the second magnetic core 3 far away from the second contact end 4; in a preferred embodiment, the heat dissipation structure may be provided as a heat sink; in another preferred embodiment, the heat dissipation structure is provided as a heat dissipation coating, and preferably, the heat dissipation coating is coated on the wall surface of the first magnetic core 1 away from the first contact end 2 and the wall surface of the second magnetic core 3 away from the second contact end 4, of course, the heat dissipation structure is not limited to the above two embodiments, and the above embodiments are only for convenience of understanding and illustration, in summary, specific embodiments of the heat dissipation structure are not limited in this embodiment, and the heat dissipation structure that can dissipate heat of the first magnetic core 1 and the second magnetic core 3 is all suitable for this embodiment and belongs to the protection scope of this embodiment.

For example, the heat dissipation structure is set as a heat sink, in a specific embodiment, in order to ensure that the heat sink is stably connected to the first magnetic core 1 and the second magnetic core 3, and the heat sink is fixedly connected to the first magnetic core 1 and the second magnetic core 3, for example, welding or bonding may be adopted, the fixing connection manner is not limited in this embodiment, and all the assembly manners that the heat sink can be stably connected to the first magnetic core 1 and the second magnetic core 3 are applicable to this embodiment and belong to the protection scope of this embodiment; in another specific embodiment, in order to facilitate the maintenance and replacement of the heat sink, the heat sink is detachably linked with the first magnetic core 1 and the second magnetic core 3, respectively; exemplarily, the radiator is connected with first magnetic core 1 and second magnetic core 3 can be dismantled through protruding and recess cooperation realization respectively, perhaps can dismantle with both through slide rail and spout cooperation realization and be connected, certainly, can dismantle the connected mode not only be limited to above-mentioned both modes, can also adopt magnetism to inhale the cooperation, does not prescribe a limit to this in this embodiment, as long as can realize that the radiator can dismantle the structure of being connected with first magnetic core 1 and second magnetic core 3 respectively and all be applicable to this application, all belong to the protection scope of this application.

The embodiments in the present description are all described in a progressive manner, and some of the embodiments are mainly described as different from other embodiments, and the same and similar parts among the embodiments can be referred to each other.

It is noted that in the description and claims of the present application and in the above-mentioned drawings, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Also, the terms "comprises," "comprising," and "having," as well as any variations thereof or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications and changes to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A planar transformer, comprising:

the first magnetic core (1) is convexly provided with a first contact end (2);

the second magnetic core (3) is convexly provided with a second contact end (4) which is in plug-in fit with the first contact end (2);

the printed circuit board (5) is provided with two mounting holes (6) for the second contact end (4) to penetrate through, wherein the periphery of one mounting hole (6) forms a primary winding, and the periphery of the other mounting hole (6) forms a PFC inductance coil;

a secondary winding (7) mounted above the primary winding;

and the first contact end (2) of the first magnetic core (1) sequentially penetrates through the secondary winding (7) and the mounting hole (6) of the printed circuit board (5) and is connected with the second contact end (4) of the second magnetic core (3).

2. Planar transformer according to claim 1, characterized in that the secondary winding (7) comprises: at least one insulated coil arranged concentrically with the mounting hole (6).

3. The planar transformer of claim 1, wherein the primary winding comprises: the primary coil, the auxiliary coil and the electromagnetic interference compensation coil are arranged in a stacked mode and are respectively installed on different layers of the printed circuit board (5).

4. Planar transformer according to claim 1, characterized in that both ends of the second magnetic core (3) are bent in a direction close to the printed wiring board (5) to form a mounting cavity for accommodating the printed wiring board (5).

5. Planar transformer according to claim 4, characterized in that the structure of the first magnetic core (1) is identical to the structure of the second magnetic core (3).

6. The planar transformer according to claim 4, wherein the first magnetic core (1) is configured as a flat plate structure, and when the first magnetic core (1) and the second magnetic core (3) are assembled, two ends of the first magnetic core (1) are respectively abutted against the bending part of the second magnetic core (3).

7. Planar transformer according to claim 1, characterized in that the first (1) and second (3) magnetic cores are detachably connected by means of a mounting structure.

8. The planar transformer of claim 7, wherein the mounting structure comprises: the first installation part and the second installation part are matched, one of the first installation part and the second installation part is arranged on the first magnetic core (1), and the other one is arranged on the second magnetic core (3).

9. The planar transformer of claim 8, wherein one of the first and second mounting members is configured as a snap and the other is configured as a slot that mates with the snap.

10. Planar transformer according to claim 1, characterized in that a heat dissipation structure is further mounted on the first (1) and second (3) magnetic cores.