A planar transformer

Abstract

The present application discloses a planar transformer, which relates to the technical field of transformers, and includes a magnetic core and a plurality of PCB boards; the magnetic core includes a base, a column and a cover; both ends of the top of the base have vertical plates, and an installation space is formed between the two vertical plates; the column is fixedly installed on the top of the base, the axis of the column is vertical, and the column is centered in the installation space; the cover is arranged on the top of the base, and the cover and the base are detachably connected; after the cover is connected to the base, the cover contacts and abuts against the top of the column; a clearance opening is opened at the center of the PCB board, and after the PCB board is installed on the magnetic core, the two ends of the PCB board extend out of the outside of the two openings of the installation space respectively. The present application has a small space occupancy rate, a low heat exchange loss and a good secondary leakage inductance, thereby making the application of planar transformers more extensive.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a planar transformer. Background Art

[0002] A transformer is a static electrical device that uses the principle of electromagnetic induction to convert AC power of one voltage level into AC power of another voltage level of the same frequency through electromagnetic induction between coils. Transformers have functions such as voltage conversion, current conversion, impedance conversion, isolation, and voltage stabilization, so they are widely used in power systems in various fields.

[0003] Among them, transformers also play an important role in the automotive field, and are mainly used in the main control board of the vehicle circuit. The transformers used in the traditional main control board of the vehicle circuit are usually winding transformers, which realize the functions of voltage conversion, current conversion and impedance conversion by winding coils.

[0004] However, when the winding transformer is used on the main control board of the vehicle circuit, it has the disadvantages of large space occupancy, high heat exchange loss and poor secondary leakage inductance. Therefore, there is an urgent need for a transformer with a smaller space occupancy, lower heat exchange loss and better secondary leakage inductance. Summary of the invention

[0005] The present application provides a planar transformer having a smaller space occupancy, lower heat exchange loss and better secondary leakage inductance, thereby making the planar transformer more widely used.

[0006] The present application provides a planar transformer, which adopts the following technical solution:

[0007] A planar transformer, comprising a magnetic core and a plurality of PCB boards with internal windings;

[0008] The magnetic core comprises a seat, a column and a cover; both ends of the top of the seat have vertical plates, and an installation space for the stacking and installation of the PCB boards is formed between the two vertical plates; the column is fixedly installed on the top of the seat, the axis of the column is vertical, and the column is centered in the installation space; the cover is arranged on the top of the seat, and the cover is detachably connected to the seat; after the cover is connected to the seat, the cover contacts and abuts against the top of the column;

[0009] A clearance opening for the column to pass through is opened at the center of the PCB board. After the PCB board is installed on the magnetic core, the column passes through multiple clearance openings, and two ends of the PCB board extend out of the outside of the two openings of the installation space respectively.

[0010] By adopting the above technical solution, the space occupancy rate of the transformer can be effectively reduced, the heat exchange loss of the transformer can be reduced, and the secondary leakage inductance of the transformer can be improved, so that the transformer can play a better and more stable role in application scenarios with a smaller total volume and more precision, such as the main control board of the vehicle circuit, thereby making the application of planar transformers more extensive.

[0011] Optionally, the magnetic core further comprises a plurality of cylinders which can be sleeved and matched with each other, the dimensions and thickness dimensions of the plurality of cylinders along their own axial directions are equal, and the cylinder with the smallest radial dimension can be sleeved and matched with the column.

[0012] By adopting the above technical solution, the user can conveniently change the cross-sectional size of the part where the magnetic core passes through the PCB board according to different PCB boards, and at the same time, the user can conveniently adjust the performance and working efficiency of the planar transformer (magnetic flux density, iron loss, heat dissipation performance, etc.).

[0013] Optionally, the bottom of the cover body has a positioning ring, and the interior of the positioning ring has a positioning groove that matches the end of the column; after the cover body is connected to the base body, the top of the column will be inserted into the positioning groove, and the positioning ring will contact and abut against the tops of several of the cylinders.

[0014] By adopting the above technical solution, it is possible to facilitate the installation position of the cover body on the top of the base body, thereby improving the position stability of the cover body relative to the base body and improving the overall structural strength of the magnetic core.

[0015] Optionally, the positioning ring and one end of the cylinder along its own axial direction both have a concave-convex structure. After the cover body is connected to the seat body, the concave-convex structure on the positioning ring and the concave-convex structures on the cylinders cooperate with each other and limit the rotation of the cylinders around their own axes.

[0016] By adopting the above technical solution, the position stability of the cylinders relative to the column after being sleeved and matched with the column can be improved, and the probability of the cylinder rotating during the use of the planar transformer can be reduced; at the same time, the contact area between the cylinder and the cover can be expanded, thereby further improving the heat dissipation performance of the planar transformer.

[0017] Optionally, it further comprises a plurality of support components and a plurality of contact components, wherein the support components are arranged on the base and located in the installation space, and the contact components are arranged on the cover and located at the bottom of the cover;

[0018] The support component includes a support member, and the contact component includes a contact member. After the multiple PCB boards are installed on the magnetic core, the support member is located below the multiple PCB boards and contacts and abuts against the PCB board located at the bottom, and the contact member is located above the multiple PCB boards and contacts and abuts against the PCB board located at the top.

[0019] By adopting the above technical solution, after multiple PCB boards are installed on the magnetic core, space is left above and below the installation space, which is convenient for dissipating the heat generated during the use of the planar transformer, thereby further improving the heat dissipation performance of the planar transformer.

[0020] Optionally, the support assembly further includes a first elastic member, and the contact assembly further includes a second elastic member; after the cover body is connected to the base body, the first elastic member has a tendency to drive the support member to move toward the direction approaching the cover body, and the second elastic member has a tendency to drive the contact member to move toward the direction approaching the base body.

[0021] By adopting the above technical solution, multiple PCB boards can be kept in a horizontal state in the installation space under the joint action of multiple support components and multiple contact components, and PCB boards of different numbers and different thicknesses can be installed in the installation space.

[0022] Optionally, it also includes multiple connecting parts, the cover body is correspondingly provided with multiple through holes for the connecting parts to pass through, the top of the vertical plate is correspondingly provided with multiple thread grooves that cooperate with the threads of the connecting parts, and after the cover body is connected to the base body, the multiple through holes are aligned one by one with the multiple thread grooves.

[0023] By adopting the above technical solution, the connection and installation of the cover body and the base body can be facilitated, and the connection strength between the cover body and the base body can be improved, thereby further improving the overall structural strength of the magnetic core.

[0024] Optionally, the top of the cover body has a plurality of grooves.

[0025] By adopting the above technical solution, the area of ​​the top end surface of the cover body can be enlarged, thereby enlarging the heat dissipation area of ​​the cover body, and further improving the heat dissipation performance of the magnetic core.

[0026] Optionally, both sides of the PCB board have a clearance groove adapted to the vertical plate. After the PCB board is installed on the magnetic core, the vertical plate is located in the clearance groove and both ends are in contact with and abut against the groove wall corresponding to the clearance groove.

[0027] By adopting the above technical solution, the process of installing the PCB board on the magnetic core can be made more convenient, and the position stability of the PCB board after installation on the magnetic core can be improved, thereby ensuring that the planar transformer can function stably and reliably during use.

[0028] Optionally, the seat body is provided with a plurality of heat dissipation holes on the vertical plate, one end of the heat dissipation hole is communicated with the installation space, and the other end of the heat dissipation hole is communicated with the space outside the seat body.

[0029] By adopting the above technical solution, the installation space can also achieve heat exchange with the outside world through a plurality of heat dissipation holes, thereby further improving the heat dissipation performance of the planar transformer.

[0030] In summary, the present application includes at least one of the following beneficial effects:

[0031] 1. It can effectively reduce the space occupancy rate of the transformer, reduce the heat exchange loss of the transformer, and improve the secondary leakage inductance of the transformer, so that the transformer can play a better and more stable role in the application scenarios with a small total volume and relatively precise, such as the main control board of the vehicle circuit, thereby making the application of planar transformers more extensive;

[0032] 2. It can facilitate the heat exchange between the installation space and the outside world, and at the same time can expand the heat dissipation area of ​​the magnetic core, thereby effectively improving the heat dissipation performance of the planar transformer and further reducing the heat exchange loss;

[0033] 3. It is convenient for users to adjust the cross-sectional dimensions of the part of the magnetic core passing through the opening according to different numbers, sizes and types of PCB boards, so that users can adjust the performance and working efficiency of the planar transformer (magnetic flux density, iron loss, heat dissipation performance, etc.);

[0034] 4. It can improve the structural strength and structural stability of the planar transformer during use, thereby ensuring that the planar transformer can function stably and reliably during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of a planar transformer in Example 1;

[0036] Figure 2 is an exploded view of a planar transformer in Example 1;

[0037] Figure 3 is a schematic diagram of the internal structure of a planar transformer in Example 1;

[0038] Figure 4 is an exploded diagram of a planar transformer in Example 2;

[0039] Figure 5is a schematic diagram of the internal structure of a planar transformer in Example 2;

[0040] Figure 6 is a schematic diagram of the internal structure of a planar transformer in Example 3;

[0041] Figure 7 is a schematic structural diagram of a planar transformer according to Embodiment 4;

[0042] Figure 8 This is a schematic diagram of the internal structure of a connection position of a connector in a planar transformer in Example 4;

[0043] Fig. 9 is a schematic structural diagram of a planar transformer according to Embodiment 5;

[0044] Fig.10 is an exploded view of a planar transformer in Example 6;

[0045] Fig.11 It is a schematic diagram of the structure of a planar transformer according to Example 7.

[0046] Explanation of the accompanying drawings: 1. magnetic core; 11. base; 111. vertical plate; 1111. threaded groove; 1112. heat dissipation hole; 112. installation space; 12. column; 13. cover; 131. positioning ring; 1311. positioning groove; 132. perforation; 133. sink; 134. groove; 14. cylinder; 2. PCB board; 21. clearance port; 22. clearance groove; 3. support assembly; 31. support member; 32. first elastic member; 4. contact assembly; 41. contact member; 42. second elastic member; 5. connecting member. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1-11 This application is described in further detail.

[0048] Embodiment 1:

[0049] Reference Figure 1 and Figure 2 The present application embodiment discloses a planar transformer, including a magnetic core 1 and a plurality of PCB boards 2 (i.e., printed circuit boards) with windings installed therein. In this embodiment, since the material of the magnetic core 1 and the structure of the PCB board 2 are both prior arts in the art, the material of the magnetic core 1 is not further limited and the structure of the PCB board 2 is not described in detail, and the structure of the PCB board 2 is only briefly shown in the attached drawings.

[0050] The magnetic core 1 includes a base 11 , a column 12 and a cover 13 .

[0051] The base body 11 is a rectangular parallelepiped structure as a whole, and the top of the base body 11 has vertical plates 111 at both ends of its length direction, and the vertical plates 111 extend upward along the height direction of the base body 11; the vertical plates 111 are a rectangular plate-shaped structure as a whole, and the length direction of the vertical plates 111 is parallel to the width direction of the base body 11. An installation space 112 for installing multiple PCB boards 2 is formed between the two vertical plates 111 at the top of the base body 11, and both ends of the installation space 112 along the width direction of the base body 11 are directly connected to the two side spaces of the base body 11 in the width direction.

[0052] The column 12 is an overall cylindrical structure. One end of the column 12 in the axial direction is fixedly connected to the top of the base 11. The column 12 is located in the installation space 112. The axial direction of the column 12 is parallel to the height direction of the base 11. The end face of the other end of the column 12 in the axial direction is flush with the end face of the top of the vertical plate 111, and the column 12 is centered in the installation space 112.

[0053] The cover body 13 is a rectangular plate-shaped structure as a whole. The cover body 13 is installed on the top of the base body 11 and is detachably connected to the base body 11. After the cover body 13 is connected to the base body 11, the bottom of the cover body 13 is simultaneously fitted and abutted against the tops of the two vertical plates 111 and the tops of the columns 12, and at this time, the magnetic core 1 is a rectangular parallelepiped structure as a whole. In this embodiment, it is preferred that the size of the cover body 13 matches the size of the base body 11, that is, the length and width of the cover body 13 are respectively equal to the length and width of the base body 11; since the magnetic core 1 formed by a combination of multiple parts is a common prior art, the manner of detachable connection between the cover body 13 and the base body 11 is not further limited here, and the related connection structure is omitted in the drawings.

[0054] Reference Figure 2 and Figure 3 The PCB board 2 is a rectangular plate-shaped structure as a whole, and the multiple PCB boards 2 have the same shape, and the multiple PCB boards 2 are neatly stacked and installed in the installation space 112.

[0055] A clearance opening 21 for the column 12 to pass through is provided in the middle of the PCB board 2, and the PCB board 2 is installed on the magnetic core 1 through the penetration of the column 12 and the clearance opening 21. When the PCB board 2 is installed on the magnetic core 1, the surface of the column 12 along its own radial direction fits against the inner wall of the clearance opening 21; at this time, the length direction of the PCB board 2 is parallel to the width direction of the base 11, and both ends of the PCB board 2 in the length direction extend out of the installation space 112 and are respectively located on both sides of the width direction of the base 11, so as to form a circuit connection.

[0056] The implementation principle of a planar transformer in the embodiment of the present application is:

[0057] When the planar transformer is in use, the space occupancy rate is significantly reduced compared with the traditional winding transformer; at the same time, the heat generated by the internal winding of the PCB board 2 during use can be directly transferred to the column 12 and dissipated to the outside through the magnetic core 1, with high heat dissipation performance and thus low heat exchange loss; and the stacking installation of multiple PCB boards 2 can make the winding distribution more compact, thereby effectively improving the secondary leakage inductance, and then improving the performance of the transformer in many aspects, thereby making the application of planar transformers more extensive.

[0058] Embodiment 2:

[0059] Reference Figure 2 and Figure 4 The difference between this embodiment and embodiment 1 is that the magnetic core 1 further includes a plurality of cylinders 14. In this embodiment, it is preferred that the magnetic core 1 is equipped with a plurality of cylinders 14 for users to select and use according to different needs.

[0060] Reference Figure 4 and Figure 5 The cylinder 14 is a hollow cylindrical structure as a whole, and the dimensions of the cylinder 14 along its own axis are equal, and the thickness dimensions of the cylinder 14 are also equal; the radial dimensions of the cylinder 14 are different, and each cylinder 14 has another cylinder 14 that forms a sleeve with it, that is, the inner diameter dimension of the cylinder 14 is equal to the outer diameter dimension of another cylinder 14; and, among the multiple cylinders 14, the inner diameter dimension of the cylinder 14 with the smallest radial dimension is equal to the radial dimension of the column 12, that is, the cylinder 14 with the smallest radial dimension can be sleeved with the column 12. In this embodiment, for the convenience of illustration, only the case where the magnetic core 1 includes two sleeved cylinders 14 is shown; in other embodiments, the magnetic core 1 can also include a larger number of cylinders 14 according to usage requirements.

[0061] At this time, the two barrels 14 and the column 12 together form a cylinder 12 with a larger cross-sectional size. The cylinder 12 has a larger cross-sectional size, which can affect the performance and working efficiency of the planar transformer (magnetic flux density, iron loss, heat dissipation performance, etc.), thereby facilitating the user to adjust the performance of the planar transformer according to usage requirements. At the same time, the size of the clearance opening 21 on the PCB board 2 should also be adjusted accordingly, so that the cylinder 12 and the multiple clearance openings 21 of the multiple PCB boards 2 installed on the magnetic core 1 are all penetrated and matched, that is, the surface of the cylinder 12 along its own radial direction fits against the inner walls of the multiple clearance openings 21.

[0062] The size of the cylinder 14 along its own axis is smaller than the size of the column 12 along its own axis, and one end of the cylinder 14 in the axis direction has a concave-convex structure; after the cylinder 14 and the column 12 are sleeved and matched, the bottom of the cylinder 14 contacts and abuts against the seat 11, and the concave-convex structure of the cylinder 14 is located at the top of the cylinder 14. In this embodiment, the concave-convex structure of the cylinder 14 is preferably a continuous tooth-like structure distributed in a circular trajectory with the axis of the cylinder 14 as the axis, and the tooth-like structures on different cylinders 14 have the same shape.

[0063] The bottom of the cover body 13 has a positioning ring 131 for positioning the cylinder 14, and the interior of the positioning ring 131 has a positioning groove 1311 adapted to the end of the column 12; when the cover body 13 is connected to the base body 11, the top of the column 12 will be inserted into the positioning groove 1311 to form a plug-in fit with the positioning ring 131.

[0064] The side of the positioning ring 131 away from the cover body 13 has a concave-convex structure that is compatible with the concave-convex structure on the cylinder 14. When the cover body 13 is connected to the base body 11, the concave-convex structure on the positioning ring 131 can simultaneously engage with the concave-convex structures on multiple cylinders 14 sleeved on the outside of the column 12. At this time, the positioning ring 131 can limit the rotation of the cylinder 14 relative to the column 12 about its own axis.

[0065] The implementation principle of a planar transformer in the embodiment of the present application is:

[0066] According to the required performance of the planar transformer, a corresponding number of cylinders 14 are installed on the outside of the column 12, and the size of the clearance opening 21 of the PCB board 2 is changed to make it compatible with the outer diameter of the outermost cylinder 14 installed outside the column 12, and then the planar transformer is installed. Finally, the positioning ring 131 is connected to the cover body 13 and the base body 11 when its concave-convex structure is engaged with the concave-convex structures of multiple cylinders 14.

[0067] Embodiment 3:

[0068] Reference Figure 3 and Figure 6 The difference between this embodiment and embodiment 1 is that the planar transformer further includes a plurality of supporting components 3 and a plurality of contact components 4.

[0069] Reference Figure 6 , multiple support assemblies 3 are installed on the base 11 and are located in the installation space 112. The support assembly 3 includes a support member 31 and a first elastic member 32. The two ends of the first elastic member 32 are respectively fixedly connected to the base 11 and the support member 31, and have a tendency to drive the support member 31 to move along the height direction of the base 11 to the extreme position and maintain it.

[0070] The plurality of contact components 4 are mounted on the cover 13. When the cover 13 is connected to the base 11, the plurality of contact components 4 are also located in the mounting space 112. The contact component 4 includes a contact member 41 and a second elastic member 42. The two ends of the second elastic member 42 are respectively fixedly connected to the cover 13 and the contact member 41, and have a tendency to drive the contact member 41 to move to the limit position along the thickness direction of the cover 13 and maintain it.

[0071] When the cover 13 is connected to the base 11, the first elastic member 32 has a tendency to drive the support member 31 to move toward the cover 13 to the extreme position and maintain it, and the second elastic member 42 has a tendency to drive the contact member 41 to move toward the base 11 to the extreme position and maintain it. In this embodiment, preferably, both the first elastic member 32 and the second elastic member 42 are springs.

[0072] When the cover 13 is connected to the base 11 and multiple PCB boards 2 are installed in the installation space 112, the support member 31 will contact and abut against the bottom of the PCB board 2 at the bottom, and the contact member 41 will contact and abut against the top of the PCB board 2 at the top, and at this time, the first elastic member 32 and the second elastic member 42 are both in a squeezed state. In this embodiment, it is preferred that the number of support components 3 and contact components 4 on the planar transformer is equal, multiple support components 3 correspond to multiple contact components 4 one by one, and the support member 31 is aligned with the corresponding contact member 41 along its own moving direction; and it is preferred that the positions where the support member 31 and the contact member 41 contact the PCB board 2 avoid the position where the winding inside the PCB board 2 is distributed.

[0073] At this time, the compression degree of the first elastic member 32 and the second elastic member 42 can be increased or decreased according to the increase or decrease in the number of PCB boards 2 installed on the magnetic core 1. In addition, at this time, there is space above and below the multiple neatly stacked PCB boards 2 in the installation space 112 for heat dissipation of the PCB boards 2.

[0074] The implementation principle of a planar transformer in the embodiment of the present application is:

[0075] After installing a suitable number of PCB boards 2 on the magnetic core 1 according to the required performance of the planar transformer, the multiple PCB boards 2 will maintain a stable position between the multiple support components 3 and the multiple contact components 4, and at the same time, the heat generated by the PCB boards 2 can be easily dissipated into the installation space 112, and the heat can be dissipated to the outside through the installation space 112.

[0076] Embodiment 4:

[0077] Reference Figure 1 and Figure 7The difference between this embodiment and the first embodiment is that the planar transformer further includes a plurality of connectors 5 , and the cover body 13 and the base body 11 are detachably connected via the plurality of connectors 5 .

[0078] Reference Figure 7 and Figure 8 The connecting member 5 is in the shape of a screw rod as a whole. In this embodiment, the planar transformer preferably includes four connecting members 5 in total.

[0079] The cover 13 is provided with a plurality of through holes 132 for the connector 5 to pass through in a direction parallel to its thickness, and the radial dimension of the through hole 132 is larger than the radial dimension of the tail of the connector 5 and smaller than the radial dimension of the head of the connector 5. In this embodiment, preferably, four through holes 132 are respectively distributed at the four corners of the cover 13; and preferably, a countersunk groove 133 for the connector 5 to countersunk is also provided at the top of the cover 13 at the location of the through holes 132.

[0080] The seat body 11 has two thread grooves 1111 on the tops of the two vertical plates 111, which are threadedly matched with the tail of the connecting member 5. The two thread grooves 1111 on the same vertical plate 111 are respectively located at the two ends of the length direction of the vertical plate 111. When the cover body 13 is connected to the seat body 11, the four through holes 132 are aligned with the corresponding thread grooves 1111 along their own axial directions; at this time, the tail of the connecting member 5 will pass through the through holes 132 and threadably match with the corresponding thread grooves 1111, and the head of the connecting member 5 is located in the corresponding recessed groove 133.

[0081] The implementation principle of a planar transformer in the embodiment of the present application is:

[0082] The cover body 13 is fixedly connected to the base body 11 through a plurality of connectors 5, the operation process is convenient and quick, and the connection strength is relatively strong; at the same time, after the cover body 13 is fixedly connected to the base body 11 through a plurality of connectors 5, the magnetic core 1 as a whole has relatively strong structural strength.

[0083] Embodiment 5:

[0084] Reference Figure 1 and Fig. 9 The difference between this embodiment and embodiment 1 lies in the cover body 13.

[0085] Reference Fig. 9 The surface of the top of the cover 13 has a plurality of grooves 134, which can effectively increase the area of ​​the top surface of the cover 13. In this embodiment, the surface of the top of the cover 13 is preferably corrugated.

[0086] The implementation principle of a planar transformer in the embodiment of the present application is:

[0087] The area of ​​the top surface of the cover 13 is increased, so that the contact area between the top surface of the cover 13 and the outside is increased, thereby effectively improving the heat dissipation performance of the magnetic core 1 at the cover 13 .

[0088] Embodiment 6:

[0089] Reference Figure 1 and Fig.10 The difference between this embodiment and embodiment 1 lies in the shape of the PCB board 2.

[0090] Reference Fig.10 , both sides of the PCB board 2 in the width direction are provided with clearance grooves 22 adapted to the vertical plates 111. When the PCB board 2 is sleeved with the column 12 through the clearance openings 21, the two vertical plates 111 can be respectively inserted into the corresponding clearance grooves 22, and at this time, the two ends of the vertical plates 111 in the length direction can respectively fit and abut against the two groove walls of the corresponding clearance grooves 22.

[0091] The implementation principle of a planar transformer in the embodiment of the present application is:

[0092] After the PCB board 2 is installed on the magnetic core 1, the position stability of the PCB board 2 relative to the magnetic core 1 can be effectively improved, thereby effectively ensuring that the planar transformer can function stably and reliably during use.

[0093] Embodiment 7:

[0094] Reference Figure 1 and Fig.11 The difference between this embodiment and embodiment 1 lies in the vertical plate 111 .

[0095] Reference Fig.11 , the seat body 11 is provided with a plurality of heat dissipation holes 1112 on the vertical plate 111, and the heat dissipation holes 1112 penetrate the vertical plate 111 in a direction parallel to the length direction of the seat body 11, so that the installation space 112 can communicate with the space outside the vertical plate 111 through the heat dissipation holes 1112. During the use of the planar transformer, the heat generated by the PCB board 2 can be dissipated outward through the magnetic core 1, and can also be directly dissipated to the outside through the installation space 112 and the plurality of heat dissipation holes 1112. In this embodiment, the heat dissipation holes 1112 are preferably circular holes, and each vertical plate 111 is preferably provided with a plurality of heat dissipation holes 1112, and the plurality of heat dissipation holes 1112 are evenly spaced on the vertical plate 111 along the width direction of the seat body 11.

[0096] The implementation principle of a planar transformer in the embodiment of the present application is:

[0097] During the use of the planar transformer, the heat generated by the PCB board 2 can be directly transferred to the magnetic core 1 and dissipated to the outside through the magnetic core 1, or can be transferred to the air in the installation space 112 and dissipated to the outside through a plurality of heat dissipation holes 1112.

[0098] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A planar transformer, characterized in that: It comprises a magnetic core (1) and a PCB board (2) with a plurality of internal windings; The magnetic core (1) comprises a base (11), a column (12) and a cover (13); both ends of the top of the base (11) are provided with vertical plates (111), and an installation space (112) for stacking and installing the PCB board (2) is formed between the two vertical plates (111); the column (12) is fixedly installed on the top of the base (11), the axis of the column (12) is vertical, and the column (12) is centered in the installation space (112); the cover (13) is arranged on the top of the base (11), and the cover (13) and the base (11) are detachably connected; after the cover (13) and the base (11) are connected, the cover (13) and the top of the column (12) are in contact and abut against each other; A clearance opening (21) for the column (12) to pass through is provided at the center of the PCB board (2); after the PCB board (2) is installed on the magnetic core (1), the column (12) passes through a plurality of the clearance openings (21), and two ends of the PCB board (2) extend out of the outside of two openings of the installation space (112); The magnetic core (1) further comprises a plurality of cylinders (14), wherein the cylinders (14) are in the form of a hollow cylindrical structure as a whole, the dimensions of the cylinders (14) along their own axial direction are equal and smaller than the dimensions of the column (12) along their own axial direction, and the thickness dimensions of the plurality of cylinders (14) are equal; different cylinders (14) have different radial dimensions, the cylinder (14) with the smallest radial dimension can be sleeved with the column (12), and each cylinder (14) has another cylinder (14) sleeved with it; The bottom of the cover body (13) is provided with a positioning ring (131), and the interior of the positioning ring (131) is provided with a positioning groove (1311) adapted to the end of the column (12). After the cover body (13) is connected to the base body (11), the top of the column (12) will be inserted into the positioning groove (1311), and the positioning ring (131) will contact and abut against the tops of the plurality of cylinders (14); the positioning ring (131) and one end of the cylinder (14) along its own axial direction are provided with concave and convex The structure is characterized in that after the cylinder (14) and the column (12) are sleeved and matched, the bottom of the cylinder (14) contacts and abuts against the base (11), and the concave-convex structure of the cylinder (14) is located at the top of the cylinder (14); when the cover (13) is connected to the base (11), the concave-convex structure on the positioning ring (131) can simultaneously engage with the concave-convex structures on the plurality of cylinders (14) sleeved on the outside of the column (12), thereby limiting the rotation of the plurality of cylinders (14) around their own axes.

2. A planar transformer according to claim 1, characterized in that: It also comprises a plurality of support components (3) and a plurality of contact components (4), wherein the support components (3) are arranged on the base body (11) and located in the installation space (112), and the contact components (4) are arranged on the cover body (13) and located at the bottom of the cover body (13); The support component (3) comprises a support member (31), and the contact component (4) comprises a contact member (41). After the plurality of PCB boards (2) are mounted on the magnetic core (1), the support member (31) is located below the plurality of PCB boards (2) and contacts and abuts against the PCB board (2) located at the bottom, and the contact member (41) is located above the plurality of PCB boards (2) and contacts and abuts against the PCB board (2) located at the top.

3. A planar transformer according to claim 2, characterized in that: The support component (3) further comprises a first elastic member (32), and the contact component (4) further comprises a second elastic member (42); after the cover body (13) is connected to the base body (11), the first elastic member (32) has a tendency to drive the support member (31) to move in a direction close to the cover body (13), and the second elastic member (42) has a tendency to drive the contact member (41) to move in a direction close to the base body (11).

4. A planar transformer according to claim 1, characterized in that: It also comprises a plurality of connecting members (5), the cover body (13) correspondingly being provided with a plurality of through holes (132) for the connecting members (5) to pass through, the top of the vertical plate (111) correspondingly being provided with a plurality of thread grooves (1111) for threadingly cooperating with the connecting members (5), and after the cover body (13) is connected to the base body (11), the plurality of through holes (132) and the plurality of thread grooves (1111) are aligned one by one.

5. A planar transformer according to claim 1, characterized in that: The top of the cover body (13) is provided with a plurality of grooves (134).

6. A planar transformer according to claim 1, characterized in that: Both sides of the PCB board (2) are provided with clearance grooves (22) adapted to the vertical plates (111); after the PCB board (2) is mounted on the magnetic core (1), the vertical plates (111) are located in the clearance grooves (22) and both ends thereof are in contact with and abut against groove walls corresponding to the clearance grooves (22).

7. A planar transformer according to claim 1, characterized in that: The seat body (11) is provided with a plurality of heat dissipation holes (1112) on the vertical plate (111), one end of the heat dissipation hole (1112) is communicated with the installation space (112), and the other end of the heat dissipation hole (1112) is communicated with the space outside the seat body (11).

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