Planar transformer and electronic device

Abstract

The utility model discloses a kind of planar transformer and electronic equipment, it is related to planar transformer technical field.The planar transformer includes magnetic block, two magnetic cores and two PCB boards, magnetic core includes horizontal strip, middle column and two edge columns, middle column and two edge columns are all arranged in the surface of horizontal strip, and two edge columns are one-to-one corresponding and arranged on the opposite sides of middle column, PCB board is provided with mounting hole, the middle column of two magnetic cores is one-to-one corresponding and arranged in the mounting hole of two PCB boards, two magnetic cores cooperate with each other, and two PCB boards are spaced apart, magnetic block is detachably installed between two PCB boards.When the leakage inductance of the planar transformer needs to be adjusted, different size magnetic blocks are replaced, and the magnetic blocks are detachably installed between the two PCB boards, the magnetic effect inside the planar transformer is changed, so that the leakage inductance of the planar transformer can be adjusted.

Description

Technical Field

[0001] This utility model belongs to the field of planar transformer technology, and particularly relates to a planar transformer and electronic equipment. Background Technology

[0002] The design of magnetic core components largely determines the success or failure of switching power supply design. Magnetic core components are indispensable in almost all power circuits. Currently, the magnetic component industry is increasingly developing towards high efficiency, miniaturization, integration, and low loss. As a very important component, the high-frequency transformer has always been a focus of industry professionals in terms of how to improve its performance, save costs, and develop miniaturization. Currently, traditional transformers are mainly wire-wound products, which require the selected wire to be wound on the frame, with adhesive tape between layers. After winding, the magnetic core and frame are assembled and fixed with glue. The finished product is large in size, the overall height cannot be reduced, the heat dissipation performance is relatively poor, and the loss is relatively large, resulting in low efficiency. However, using planar transformers can solve these problems very well.

[0003] Planar transformers, with their unique flat structure, greatly increase the heat dissipation area on their surface, resulting in better heat dissipation in high-frequency environments and avoiding severe overheating. However, with the continuous increase in frequency, the leakage inductance of traditional planar transformers is uncontrollable, and the impact of transformer leakage inductance is becoming increasingly apparent. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a planar transformer and electronic equipment to address the problem of uncontrollable leakage inductance value of existing planar transformers.

[0005] To address the aforementioned problems, this utility model provides a planar transformer, comprising a magnetic block, two magnetic cores, and two PCB boards. Each magnetic core includes a horizontal bar, a central post, and two side posts. The central post and the two side posts are each disposed on one surface of the horizontal bar, and the two side posts are correspondingly disposed on opposite sides of the central post. The PCB boards have mounting holes, and the central posts of the two magnetic cores are correspondingly inserted into the mounting holes of the two PCB boards. The two magnetic cores cooperate with each other, and the two PCB boards are spaced apart. The magnetic block is detachably mounted between the two PCB boards.

[0006] As a further improvement to the above technical solution: Optionally, at least one end of the side post is provided with a limiting block, and the magnetic block can abut against the limiting block to position the magnetic block.

[0007] Optionally, each of the two side posts is provided with a limiting block at one end, and there are two magnetic blocks. The two magnetic blocks can abut against the two limiting blocks one by one to position the magnetic blocks.

[0008] Optionally, the planar transformer further includes a connecting post, and the PCB board has a connecting hole, through which the connecting post passes and is electrically connected to the winding circuit of the PCB board.

[0009] Optionally, the sidewall of the connecting hole is covered with a copper sheet, which is electrically connected to the winding lines of the PCB board and can be electrically connected to the connecting post.

[0010] Optionally, the cross-section of the central column is circular.

[0011] Optionally, the PCB board is glued to the magnetic core.

[0012] Optionally, the two magnetic cores are bonded together with epoxy adhesive.

[0013] Optionally, the magnetic block is fixed to the magnetic core by epoxy adhesive.

[0014] On the other hand, this utility model embodiment provides an electronic device, including the planar transformer as described above.

[0015] The planar transformer and electronic device provided in this embodiment of the utility model have at least the following advantages compared with the prior art: When it is necessary to adjust the leakage inductance value of the planar transformer, different sizes of magnetic blocks are replaced and the magnetic blocks are detachably installed between two PCB boards, which changes the magnetic permeability inside the planar transformer. Compared with the existing structure without adding magnetic blocks, the permeability changes, and more energy on the primary side cannot be absorbed by the secondary side, thereby changing the leakage inductance value of the planar transformer. The leakage inductance value can be adjusted by using magnetic blocks of different sizes, thereby realizing the adjustable leakage inductance value of the planar transformer. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of a planar transformer provided in one embodiment of the present invention; Figure 2 This is a top view of a planar transformer provided in one embodiment of the present invention; Figure 3 This is a side view of a planar transformer provided in one embodiment of the present invention; Figure 4 This is a top view of the magnetic core of a planar transformer provided in one embodiment of the present invention; Figure 5 This is a front view of the magnetic core of a planar transformer provided in one embodiment of the present invention; Figure 6 This is a top view of the PCB board of a planar transformer provided in one embodiment of the present invention.

[0018] The reference numerals in the accompanying drawings are as follows: 100. Planar transformer; 110. Magnetic block; 120. Magnetic core; 121. Horizontal bar; 122. Central column; 123. Side column; 124. Limiting block; 130. PCB board; 131. Mounting hole; 132. Connecting hole; 140. Connecting post. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1 to 6As shown, one embodiment of this utility model provides a planar transformer 100. Please refer to [link / reference]. Figures 1 to 3 The planar transformer 100 includes a magnetic block 110, two magnetic cores 120, and two PCB boards 130. Please refer to [link / reference]. Figure 4 and Figure 5 The magnetic core 120 includes a horizontal bar 121, a central post 122, and two side posts 123. The central post 122 and the two side posts 123 are both located on one surface of the horizontal bar 121, and the two side posts 123 are located on opposite sides of the central post 122. (See also...) Figure 6 The PCB board 130 has mounting holes 131. The central posts 122 of the two magnetic cores 120 are respectively inserted through the mounting holes 131 of the two PCB boards 130. The two magnetic cores 120 cooperate with each other, and the two PCB boards 130 are spaced apart. The magnetic block 110 can be detachably installed between the two PCB boards 130.

[0023] When it is necessary to adjust the leakage inductance of the planar transformer 100, a magnet 110 of a different size is replaced and the magnet 110 is detachably installed between the two PCB boards 130. This changes the magnetic permeability inside the planar transformer 100. Compared with the existing structure without the addition of the magnet 110, the permeability changes, and more energy on the primary side cannot be absorbed by the secondary side, thus changing the leakage inductance of the planar transformer 100. The leakage inductance can then be adjusted by using magnets 110 of different sizes, thereby achieving adjustable leakage inductance of the planar transformer 100.

[0024] In this embodiment, the PCB board 130 is glued and fixed to the magnetic core 120 with epoxy adhesive. The two magnetic cores 120 are glued and fixed to each other with epoxy adhesive. The magnetic block 110 is glued and fixed to the magnetic core 120 with epoxy adhesive.

[0025] When assembling the planar transformer 100, firstly, install the two PCB boards 130 one-to-one with the two magnetic cores 120. The central post 122 of the magnetic core 120 passes through the mounting hole 131 of the corresponding PCB board 130, and use epoxy glue to stick and fix the PCB board 130 to the magnetic core 120. Then, use epoxy glue to stick and fix the magnetic block 110 to the PCB board 130 to adjust the leakage inductance value. Finally, use epoxy glue to stick and fix the two magnetic cores 120 (the central post 122 of the two magnetic cores 120 is stuck and fixed with epoxy glue, and the side post 123 of the two magnetic cores 120 is stuck and fixed with epoxy glue) to form a closed magnetic circuit.

[0026] In this embodiment, two magnetic blocks 110 are disposed between the two PCB boards 130.

[0027] When assembling the planar transformer 100, firstly, install the two PCB boards 130 one-to-one with the two magnetic cores 120. The central post 122 of the magnetic core 120 passes through the mounting hole 131 of the corresponding PCB board 130, and use epoxy glue to stick and fix the PCB board 130 to the magnetic core 120. Then, stick and fix the two magnetic blocks 110 one-to-one with the two PCB boards 130 with epoxy glue, and the two magnetic blocks 110 are located on both sides of the middle of the two PCB boards 130 to adjust the leakage inductance value. Finally, use epoxy glue to stick and fix the two magnetic cores 120 (the central post 122 of the two magnetic cores 120 is stuck and fixed with epoxy glue, and the side post 123 of the two magnetic cores 120 is stuck and fixed with epoxy glue) to form a closed magnetic circuit.

[0028] In one specific embodiment, the magnetic core 120 is an E-shaped magnetic core 120, meaning the cross-section of the central pillar 122 is square. In another specific embodiment, the magnetic core 120 is an ER-shaped magnetic core 120, meaning the cross-section of the central pillar 122 is circular. Of course, it is understood that the cross-section of the central pillar 122 can also be other shapes, and this is not limited here.

[0029] One embodiment of this utility model provides a planar transformer 100. Please refer to [link / reference]. Figure 4 and Figure 5 At least one end of the side post 123 is provided with a limiting block 124, and the magnetic block 110 can abut against the limiting block 124 to position the magnetic block 110. To facilitate the installation and positioning of the magnetic block 110, a limiting block 124 is provided at one end of the side post 123. When it is necessary to install the magnetic block 110, the magnetic block 110 can abut against the limiting block 124 to position the magnetic block 110.

[0030] In one specific embodiment, each of the two side posts 123 is provided with a limiting block 124 at one end, and there are two magnetic blocks 110. The two magnetic blocks 110 can abut against the two limiting blocks 124 one by one to position the magnetic blocks 110.

[0031] In this embodiment, please refer to Figure 4 and Figure 5 The side post 123 is L-shaped, and the protrusion of the L-shaped side post 123 is a limiting block 124. When the magnetic block 110 needs to be installed, one end of the magnetic block 110 can be positioned and abutted against the protrusion of the L-shaped side post 123.

[0032] One embodiment of this utility model provides a planar transformer 100, which further includes a connecting post 140. A connecting hole 132 is provided on a PCB board 130, and the connecting post 140 passes through the connecting hole 132 and is electrically connected to the winding circuit of the PCB board 130. The winding circuit surrounds the outside of the mounting hole 131 and is fixed to the PCB board 130. The sidewall of the connecting hole 132 is covered with a copper sheet, which is electrically connected to the winding circuit of the PCB board 130 and can also be electrically connected to the connecting post 140. The connecting post 140 serves as the transformer's output pin, electrically connected to external devices.

[0033] When assembling the planar transformer 100, firstly, install the two PCB boards 130 one-to-one with the two magnetic cores 120. The central post 122 of the magnetic core 120 passes through the mounting hole 131 of the corresponding PCB board 130, and use epoxy glue to stick and fix the PCB board 130 to the magnetic core 120. Then, stick and fix the two magnetic blocks 110 one-to-one with the two PCB boards 130 with epoxy glue, and the two magnetic blocks 110 are located on both sides of the middle of the two PCB boards 130 to adjust the leakage inductance value. Then, weld the connecting post 140 to the mounting hole 131 of the PCB board 130 as the transformer's output. Finally, use epoxy glue to stick and fix the two magnetic cores 120 (the central post 122 of the two magnetic cores 120 is stuck and fixed with epoxy glue, and the side post 123 of the two magnetic cores 120 is stuck and fixed with epoxy glue) to form a closed magnetic circuit.

[0034] In addition, such as Figures 1 to 6 As shown, another embodiment of the present invention provides an electronic device, which includes a planar transformer 100 as provided in any of the above embodiments. The specific structure of the planar transformer 100 is the same as described in the above embodiments. Since the present electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0035] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A planar transformer, characterized in that, The device includes a magnetic block, two magnetic cores, and two PCB boards. Each magnetic core includes a horizontal bar, a central post, and two side posts. The central post and the two side posts are all located on one surface of the horizontal bar, and the two side posts are located on opposite sides of the central post. The PCB boards have mounting holes, and the central posts of the two magnetic cores are inserted into the mounting holes of the two PCB boards. The two magnetic cores cooperate with each other, and the two PCB boards are spaced apart. The magnetic block can be detachably installed between the two PCB boards.

2. The planar transformer according to claim 1, characterized in that, At least one end of the side post is provided with a limiting block, and the magnetic block can abut against the limiting block to position the magnetic block.

3. The planar transformer according to claim 2, characterized in that, Each of the two side posts is provided with a limiting block at one end. There are two magnetic blocks, and the two magnetic blocks can abut against the two limiting blocks one by one to position the magnetic blocks.

4. The planar transformer according to claim 1, characterized in that, The planar transformer also includes a connecting post, and a connecting hole is provided on the PCB board. The connecting post passes through the connecting hole and is electrically connected to the winding circuit of the PCB board.

5. The planar transformer according to claim 4, characterized in that, The sidewall of the connecting hole is covered with a copper sheet, which is electrically connected to the winding circuit of the PCB board and can also be electrically connected to the connecting post.

6. The planar transformer according to claim 1, characterized in that, The cross-section of the central column is circular.

7. The planar transformer according to claim 1, characterized in that, The PCB board is glued and fixed to the magnetic core with epoxy adhesive.

8. The planar transformer according to claim 1, characterized in that, The two magnetic cores are bonded together with epoxy adhesive.

9. The planar transformer according to claim 1, characterized in that, The magnetic block is fixed to the magnetic core by epoxy adhesive.

10. An electronic device, characterized in that, Including the planar transformer as described in any one of claims 1 to 9.

Images