Planar transformer and electronic equipment

Abstract

The utility model discloses a planar transformer and electronic equipment, the planar transformer comprises a magnetic core, a winding, a PCB (Printed Circuit Board) and pins, and the magnetic core is provided with a support column; the winding sleeves the supporting column; the PCB is provided with an avoiding opening and a penetrating hole, wherein the penetrating hole and the winding are arranged at intervals. The PCB is arranged on the supporting column in a sleeving mode through the avoiding opening. The pin comprises a connecting part and an extending part which are connected, the connecting part penetrates through the PCB through the through hole, the extending part is located outside the PCB, and the cross sectional area of the extending part is matched with the cross sectional area of the connecting part so that the pin can meet the preset current-carrying density requirement. Therefore, under the condition of not changing the size specification of the through hole for the pin to pass through on the PCB, the overall cross sectional area of the pin can be changed by changing the width or the thickness of the extension part, so that the pin meets the preset current-carrying density requirement, and the planar transformer meets the use scene requirement under high power.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of transformers, and in particular, to a planar transformer and an electronic device. Background Art

[0002] A transformer is a common electrical component, usually composed of a magnetic core such as a ferrite magnetic core, an iron-silicon-aluminum magnetic core or a iron powder magnetic core, and a copper coil. It is large in volume and prone to electromagnetic interference. For this reason, a planar transformer has been designed. The planar transformer designs the winding into a planar structure on the PCB board, so as to reduce the overall volume.

[0003] Generally speaking, a planar transformer includes a magnetic core, windings (primary winding and secondary winding) and pins. Specifically, perforations are provided on the PCB board, and the pins pass completely through the perforations on the PCB board and are connected to the main board. In order to meet the usage requirements of high power and the current density requirements, that is, to meet the flow of large current and a fixed current density, it is necessary to increase the cross-sectional area of the pins, and then it is necessary to increase the opening size of the perforations. Since the distance between the pins and the windings needs to meet the corresponding electrical requirements, increasing the opening size of the perforations requires extending the PCB board outwards and increasing the size of the PCB board, which will increase the cost of the PCB board and cause inconvenience. Summary of the Utility Model

[0004] In order to solve the above technical problems, the embodiments of the present utility model provide a convenient-to-use planar transformer and an electronic device.

[0005] The embodiments of the present utility model solve its technical problems by adopting the following technical solutions:

[0006] A planar transformer includes a magnetic core, windings, a PCB board and pins. The magnetic core is provided with support columns; the windings are sleeved on the support columns; the PCB board is provided with an avoidance opening and perforations spaced from the windings, and the PCB board is sleeved on the support columns through the avoidance opening; the pins include a connected portion and an extending portion, the connected portion passes through the PCB board through the perforations, the extending portion is located outside the PCB board, and the cross-sectional area of the extending portion is configured to cooperate with the cross-sectional area of the connected portion so that the pins meet the preset current density requirements.

[0007] In some embodiments, the planar transformer further includes a main board disposed on one longitudinal side of the magnetic core. The extending direction of the connected portion is parallel to the extending direction of the support column. The connected portion and the extending portion are arranged at an angle. One end of the extending portion is connected to the connected portion, and the other end of the extending portion is connected to the main board.

[0008] In some embodiments, the perforation penetrates through a sidewall of the PCB board to form an opening, a part of the connecting portion is inserted into the perforation, and another part of the connecting portion extends out of the perforation through the opening, so that the cross-sectional area of the connecting portion is greater than or equal to the cross-sectional area of the extending portion.

[0009] In some embodiments, the connecting portion is completely inserted into the perforation, and the cross-sectional area of the connecting portion is smaller than the cross-sectional area of the extending portion.

[0010] In some embodiments, the planar transformer further includes a main board disposed on a lateral side of the magnetic core. The extending direction of the connecting portion is parallel to the extending direction of the extending portion. The pin further includes a first intermediate portion. One end of the connecting portion is connected to one end of the extending portion through the first intermediate portion. The other end of the connecting portion is connected to the main board, and the other end of the extending portion is connected to the main board.

[0011] In some embodiments, the pin further includes a second intermediate portion. The other end of the connecting portion is connected to the other end of the extending portion through the second intermediate portion, and the second intermediate portion is connected to the main board.

[0012] In some embodiments, the perforation penetrates through a sidewall of the PCB board to form an insertion opening, and the connecting portion is at least partially inserted into the perforation through the insertion opening.

[0013] In some embodiments, both the connecting portion and the extending portion are located on the same side of the magnetic core.

[0014] In some embodiments, the pin includes a first pin and a second pin. Both the first pin and the second pin include the connecting portion and the extending portion. The connecting portion of the first pin is located on one side of the support column, and the connecting portion of the second pin is located on the other side opposite to the support column.

[0015] The embodiments of the present invention also adopt the following technical solutions to solve its technical problems:

[0016] An electronic device includes the above-mentioned planar transformer.

[0017] The beneficial effects of the embodiments of the present utility model are as follows: The planar transformer provided by the embodiments of the present application includes a magnetic core, windings, a PCB board, and pins. The magnetic core is provided with support columns; the windings are sleeved on the support columns; the PCB board is provided with avoidance openings and through holes spaced from the windings, and the PCB board is sleeved on the support columns through the avoidance openings; the pins include a connecting portion and an extending portion connected to each other. The connecting portion passes through the PCB board through the through hole, and the extending portion is located outside the PCB board. The cross-sectional area of the extending portion is configured to cooperate with the cross-sectional area of the connecting portion so that the pins meet the preset current-carrying density requirement. In this way, without changing the size specifications of the through holes on the PCB board for the pins to pass through, the overall cross-sectional area of the pins can be changed by changing the width or thickness of the extending portion, so that the pins meet the preset current-carrying density requirement, and the planar transformer meets the usage scenario requirements under high power. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0019] Figure 1 is the front view of the planar transformer of one embodiment of the present application;

[0020] Figure 2 is the front view of the planar transformer of another embodiment of the present application;

[0021] Figure 3 is the schematic diagram of the PCB board of one embodiment of the present application;

[0022] Figure 4 is the front view of the planar transformer of another embodiment of the present application;

[0023] Figure 5 is the front view of the planar transformer of another embodiment of the present application;

[0024] Figure 6 is Figure 5 the view from another angle of

[0025] Figure 7 is the front view of the planar transformer of another embodiment of the present application;

[0026] Figure 8 is the schematic diagram of the PCB board of one embodiment of the present application;

[0027] In the figure: 1, planar transformer; 3, magnetic core; 4, winding; 5, PCB board; 6, pin; 7, main board;

[0028] 31. Support column; 32. Outer frame; 301. Accommodation cavity;

[0029] 51. Avoidance opening; 52. Opening; 53. Insertion opening;

[0030] 61. Connection part; 62. Extension part; 63. First intermediate part; 64. Second intermediate part; 611. A connection point; 612. B connection point. Detailed implementation manner

[0031] For the convenience of understanding the present utility model, the present utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0033] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] With the trend of miniaturization and integration of electronic products, the problems of the volume and efficiency of traditional transformers have become increasingly prominent. To meet this demand, planar transformers have emerged. Planar transformers adopt a flat winding structure, which improves the skin effect of current and increases the operating frequency and efficiency. Generally speaking, a planar transformer includes a magnetic core, windings (primary winding and secondary winding), and pins. Among them, one way of the windings can be a structure with built-in copper layers on a PCB board, and the PCB board is provided with through holes, and the pins pass completely through the through holes on the PCB board and are connected to the main board. To meet the requirements of high power usage and current density requirements, that is, to meet the flow of large current and a fixed current density, it is necessary to increase the cross-sectional area of the pins, and then it is necessary to increase the opening size of the through holes. Since the distance between the pins and the windings needs to meet the corresponding electrical requirements, increasing the opening size of the through holes requires extending the PCB board outwards and increasing the size of the PCB board, increasing the cost of the PCB board.

[0035] Based on the above problems, the inventors of the present application found that if the shape of the pins is changed so that part of the pins is located outside the PCB board and the cross-sectional area of the part of the pins located outside the PCB is changed, the preset current density requirements of the pins can be met without changing the size of the through holes on the PCB board.

[0036] As Figures 1-8 shown, a planar transformer 1 provided by one embodiment of the present application includes a magnetic core 3, windings 4, a PCB board 5, and pins 6. The magnetic core 3 includes support columns 31, the windings 4 are sleeved on the support columns 31, the PCB board 5 is provided with an avoidance opening 51 and through holes spaced from the windings 4, and the PCB board 5 is sleeved on the support columns 31 through the avoidance opening 51. Among them, the pins 6 include a connected connection part 61 and an extension part 62, the connection part 61 passes through the PCB board 5 through the through hole, and the extension part 62 is located outside the PCB board 5, that is, the extension part 62 does not pass through the through hole but is located outside the through hole. And, the cross-sectional area of the extension part 62 is configured in cooperation with the cross-sectional area of the connection part 61 to make the pins 6 meet the preset current density requirements.

[0037] Among them, the distance between the windings 4 and the through holes can be flexibly adjusted or designed according to the corresponding electrical requirements. The windings 4 can be set separately, or can be set on the PCB board 5, or part of them can be set separately and part of them can be set on the PCB board 5.

[0038] In this way, without changing the size specifications of the through holes on the PCB board 5 for the pins 6 to pass through, the overall cross-sectional area of the pins 6 can be changed by changing the width or thickness of the extension part 62, so that the pins 6 meet the preset current density requirements, and the planar transformer 1 meets the usage scenario requirements under high power.

[0039] It can be understood that based on the relationship among the current density ρ of pin 6, the current I (in A) that pin 6 can withstand, the width W (in mm) of pin 6, and the thickness t (in mm) of pin 6, the calculation formula is obtained: ρ = I / (W * t).

[0040] According to this calculation formula, in a high-power usage scenario where a larger current needs to be withstood, the width W and thickness t of pin 6 can be changed, that is, the overall cross-sectional area of pin 6 is changed to ensure the preset current density requirement, that is, a constant current density is obtained.

[0041] It should be noted here that the cross-sectional area of the connecting portion 61 refers to the area of the cross-section obtained along the direction perpendicular to the extension direction of the connecting portion 61. The cross-sectional area of the extending portion 62 refers to the cross-sectional area obtained along the direction perpendicular to the extension direction of the extending portion 62. For the sake of easy understanding, taking Figures 1-6 the direction M shown in as the extension direction M of the connecting portion 61 and the direction N as the extension direction N of the extending portion 62.

[0042] In some embodiments, as Figures 1-7 shown, the magnetic core 3 further includes an outer frame 32 having a receiving cavity 301. The support posts 31 are disposed in the receiving cavity 301, and the PCB board 5 and the winding 4 are both at least partially disposed in the receiving cavity 301. In this way, the outer frame 32 can limit the positions of the PCB board 5 and the winding 4, playing a certain protective role, and at the same time can also enhance the magnetic field for the PCB board 5 and the winding 4.

[0043] The magnetic core 3 can be formed by connecting two parts of magnetic core bodies. For example, it can be formed by connecting an I-shaped magnetic core body and an E-shaped magnetic core body. Among them, the middle part of the E magnetic core body constitutes the support post 31. Of course, it can also be formed by connecting two E-shaped magnetic core bodies. At this time, the support post 31 is the middle part of the two E magnetic core bodies. Of course, the magnetic core 3 can also be formed by combining magnetic core bodies of other shapes, which will not be elaborated here.

[0044] In some embodiments, the winding 4 includes a primary winding and a secondary winding. The primary winding and the secondary winding both have various forms. For example, both the primary winding and the secondary winding can be any one of the ways such as the copper layer, coil, or copper sheet built in the PCB board 5, and can be specifically set according to needs.

[0045] In some embodiments, the number of PCB boards 5 can be determined according to requirements. Exemplarily, the number of PCB boards 5 is one, two, three or more. When the number of PCB boards 5 is two or more, multiple PCB boards 5 are stacked along the extension direction L of the support posts to ensure that multiple PCB boards 5 can surround the support posts 31, and adjacent two PCB boards 5 are insulated from each other. And there can be a spacing between adjacent two PCB boards 5, or they can be directly attached to each other, which is specifically set according to requirements. In some embodiments, the copper layers built in multiple PCB boards 5 are connected through pins 6, so as to realize the parallel connection of multiple PCB boards 5.

[0046] It can be understood that there are different ways for the stacking direction of multiple PCB boards 5. For example Figures 1-2 as shown, multiple PCB boards 5 are stacked along the direction perpendicular to the first direction Z; as Figures 4-7 shown, multiple PCB boards 5 can also be stacked along the first direction Z.

[0047] In some embodiments, the planar transformer 1 further includes a main board 7, the main board 7 is disposed on one side of the magnetic core 3, and the main board 7 is connected to the extension portion 62. It can be understood that the setting manner between the main board 7 and the magnetic core 3 can be selected according to requirements. For example, the main board 7 is disposed on the longitudinal side of the magnetic core 3, or for another example, the main board 7 is disposed on the transverse side of the magnetic core 3.

[0048] For the convenience of understanding the different structures of the pins 6 of the present application, the following will be introduced in detail with different embodiments, specifically as follows:

[0049] Embodiment 1

[0050] In some embodiments, as Figures 1-2 shown, the direction L is the extension direction of the support post 31, the extension direction M of the connecting portion 61 is parallel to the extension direction L of the support post 31, the connecting portion 61 and the extension portion 62 are arranged at an angle, one end of the extension portion 62 is connected to the connecting portion 61, and the other end of the extension portion 62 is connected to the main board 7. Among them, the main board 7 is disposed on the longitudinal side of the magnetic core 3.

[0051] The angle between the connecting portion 61 and the extension portion 62 can be a right angle, an acute angle or an obtuse angle, and can be specifically selected and set according to requirements. Exemplarily, the angle between the connecting portion 61 and the extension portion 62 is 90°, 89°, 85°, 91°, 95°, etc. In this embodiment, the angle β between the connecting portion 61 and the extension portion 62 is 90°, that is, the connecting portion 61 and the extension portion 62 are perpendicular to each other, and the shape of the pin 6 is L-shaped.

[0052] In some embodiments, the connecting portion 61 is completely inserted into the through hole, and the cross-sectional area of the connecting portion 61 is smaller than that of the extending portion 62. Limited by the size specification of the through hole, the width and thickness of the connecting portion 61 will also be limited. At this time, the cross-sectional area of the extending portion 62 can be changed, and the cross-sectional area of the extending portion 62 is made larger than that of the connecting portion 61, so that the overall cross-sectional area of the pin 6 can be increased to meet the current-carrying density requirements in high-power scenarios. It can be understood that the cross-sectional area of the extending portion 62 can be changed by increasing the thickness or width of the extending portion 62.

[0053] In some embodiments, such as Figure 2 and Figure 3 As shown, the through hole penetrates through one side wall of the PCB board 5 to form an opening 52. A part of the connecting portion 61 is disposed in the through hole, and the other part of the connecting portion 61 extends outside the through hole through the opening 52, so that the cross-sectional area of the connecting portion 61 is greater than or equal to that of the extending portion 62. Since one end of the opening 52 is in an open state, the connecting portion 61 can be partially disposed outside the PCB board through the open end of the opening 52 to increase the cross-sectional area of the connecting portion 61, thereby increasing the current that the pin 6 can withstand, which is beneficial to meeting the scenario requirements under high power.

[0054] In some embodiments, such as Figures 1-2 As shown, there are multiple PCB boards 5, and the multiple PCB boards 5 are stacked in a direction perpendicular to the first direction Z, that is, stacked in the extending direction L of the support column 31. Among them, the connecting portion 61 penetrates through the through holes of the multiple PCB boards 5 in a direction perpendicular to the first direction Z, and the extending portion 62 extends in a direction opposite to the first direction Z and is connected to the main board 7. Since the extending portion 62 is located outside the PCB board 5, the width and thickness of the extending portion 62 are not limited by the specifications of the through holes of the PCB board 5, and the width and thickness of the extending portion 62 can be changed according to the preset current-carrying density to be satisfied, so that the planar transformer 1 meets the usage scenario requirements under high power.

[0055] It should be understood that the number of pins 6 is set according to needs, and the number of pins 6 can be two, three, four or more. In some embodiments, such as Figures 1-2 As shown, the pin 6 includes a first pin 6a and a second pin 6b. Both the first pin 6a and the second pin 6b include a connecting portion 61 and an extending portion 62. The connecting portion 61 of the first pin 6a is located on one side of the support column 31, and the connecting portion 61 of the second pin 6b is located on the other side of the support column 31.

[0056] Since the current of the pin 6 all flows into the connecting portion 61 after flowing along the extending portion 62 of the pin 6, such as Figure 1 and Figure 2The arrow flow direction shown at this time, where the current at the connection points of the two connecting parts 61 with the first and last PCB boards among the stacked PCB boards 5 (i.e., Figure 1 and Figure 2 the A connection point 611 and the B connection point 612 shown in) is the largest, and since the A connection point 611 and the B connection point 612 are not connected to the same PCB board 5, current shunting can be achieved.

[0057] Embodiment 2

[0058] In some embodiments, as Figures 4 to 6 shown, there are multiple PCB boards 5, and the multiple PCB boards 5 are stacked along the first direction Z, and the support posts 31 are configured to extend along the first direction Z. At this time, the main board 7 is located on the lateral side of the magnetic core 3.

[0059] In some embodiments, as Figures 4 to 6 shown, the extension direction M of the connecting part 61 is parallel to the extension direction N of the extension part 62.

[0060] The pin 6 further includes a first intermediate part 63. One end of the connecting part 61 is connected through one end of the extension part 62, the other end of the connecting part 61 is connected to the main board 7, and the other end of the extension part 62 is connected to the main board 7. In this way, without changing the opening size of the through hole, by changing the width and thickness dimensions of the extension part 62 and / or the first intermediate part 63, the cross-sectional area of the pin 6 can be changed to meet the design requirements of the preset current-carrying density. In this embodiment, the shape of the pin 6 is U-shaped.

[0061] It can be understood that the number of pins 6 can be set as needed, and can be one, two, three, four or more, as long as the winding 4 can be connected to the main board 7 through the pins. When the number of pins 6 is two or more, the multiple pins 6 can be on the same side of the magnetic core 3 or on different sides of the magnetic core 3.

[0062] In some embodiments, as Figures 4 to 6 shown, the number of pins 6 is two, namely the first pin 6a and the second pin 6b, and the first pin 6a and the second pin 6b are on the same side with respect to the magnetic core 3. Among them, according to the different setting methods of the pin 6 with respect to the magnetic core 3, the connecting part 61 and the extension part 62 have different relative positions with respect to the magnetic core 3. In this way, the user can select a planar transformer with different setting methods according to needs, so as to meet the requirements of the installation scenario of the planar transformer 1.

[0063] Exemplarily, in one way, as Figure 4 shown, the extension parts 62 of the first pin 6a and the second pin are respectively on the opposite sides of the PCB board 5. In another way, asFigure 5 As shown in Figure 6 Figure 1, the extensions 62 of the first pin 6a and the extensions 62 of the second pin 6b are both located on the same side of the PCB board 5.

[0064] Embodiment III

[0065] Different from Embodiment II, as shown in Figure 7 Figure 2, the pin 6 in this embodiment further includes a second intermediate portion 64. The other end of the connecting portion 61 is connected to the other end of the extension portion 62 through the second intermediate portion 64, and the second intermediate portion 64 is connected to the main board 7. Thus, the connecting portion 61, the extension portion 62, the first intermediate portion 63, and the second intermediate portion 64 together form the pin 6, and the shape of the pin 6 is in the shape of a "hui" character. Compared with the structure of the pin 6 in Embodiment II, using the pin 6 with this shape can reduce the number of solder joints where the pin 6 is connected to the main board 7, the utilization space of the pin 6 is larger, and it is beneficial to improve production efficiency.

[0066] To facilitate understanding the change in the number of solder joints between the pins and the main board 7 in this embodiment and Embodiment II, in Embodiment II Figures 4-6 the number of solder joints for the way the shown pin 6 is connected to the main board 7 is two, which are respectively the connection between the connecting portion 61 and the main board 7, and the connection between the extension portion 62 and the main board 7. In this embodiment, the second intermediate portion 64, the extension portion 62, and the connecting portion 61 are all connected to the main board 7, and at this time the number of solder joints is one. Therefore, the structure of the pin 6 in this embodiment can reduce the number of solder joints compared with the structure of the pin 6 in Embodiment II.

[0067] In some embodiments, as shown in Figure 8 Figure 3, a through hole penetrates through one side wall of the PCB board 5 to form an insertion opening 53, and the connecting portion 61 of the pin 6 passes through the insertion opening 53 at least partially through the through hole. That is, when installing the pin 6, the connecting portion 61 of the pin 6 can be partially inserted into the through hole through the insertion opening 53, which facilitates the assembler to assemble the product and is beneficial to improving the installation efficiency. In this embodiment, the number of insertion openings 53 is two, and the two insertion openings 53 are respectively located at both ends of the PCB board 5.

[0068] It can be understood that the number of pins 6 corresponds to the number of insertion openings 53. For example, if the number of pins 6 is two, then the number of insertion openings 53 needs to be set to two correspondingly. When the number of pins 6 is three, then the number of insertion openings 53 is three. And so on, which will not be elaborated here.

[0069] The planar transformer 1 provided by the embodiment of the present application includes a magnetic core 3, a winding 4, a PCB board 5, and pins 6. The magnetic core 3 is provided with support columns 31; the winding 4 is sleeved on the support columns 31; the PCB board 5 is provided with an avoidance opening 51 and a through hole spaced from the winding 4, and the PCB board 5 is sleeved on the support columns 31 through the avoidance opening 51; the pins 6 include a connected connection portion 61 and an extension portion 62. The connection portion 61 passes through the PCB board 5 through the through hole, and the extension portion 62 is located outside the PCB board 5. The cross-sectional area of the extension portion 62 is configured to cooperate with the cross-sectional area of the connection portion to enable the pins 6 to meet the preset current-carrying density requirement. In this way, without changing the size specifications of the PCB board 5, the overall cross-sectional area of the pins 6 can be changed by changing the width or thickness of the extension portion 62, so that the pins 6 meet the preset current-carrying density requirement, and the planar transformer 1 meets the usage scenario requirements under high power. There is no need to extend the PCB board 5 outward to increase the size of the PCB board 5, which is beneficial to reducing costs.

[0070] The electronic device provided by another embodiment of the present application includes the planar transformer 1 in the above embodiment. There are various types of electronic devices. For example, it can be an intelligent interactive tablet, a liquid crystal display, a touch screen, etc., or it can be applied to routers, switches, etc.

[0071] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A planar transformer (1), characterized in that: include: The magnetic core (3) is provided with a support column (31); A winding (4) is sleeved on the support column (31); A PCB board (5) is provided with an avoidance opening (51) and a through hole arranged at a distance from the winding (4), and the PCB board (5) is sleeved on the support column (31) through the avoidance opening (51); The pin (6) comprises a connecting portion (61) and an extending portion (62) connected to each other, wherein the connecting portion (61) is arranged on the PCB board (5) through the through hole, and the extending portion (62) is located outside the PCB board (5), and the cross-sectional area of ​​the extending portion (62) matches the cross-sectional area of ​​the connecting portion (61) and is configured so that the pin (6) meets a preset current density requirement.

2. The planar transformer (1) according to claim 1, characterized in that The planar transformer (1) further comprises a main board (7) arranged on one longitudinal side of the magnetic core (3); the extension direction of the connecting portion (61) is parallel to the extension direction of the supporting column (31); the connecting portion (61) and the extending portion (62) are arranged at an angle; one end of the extending portion (62) is connected to the connecting portion (61), and the other end of the extending portion (62) is connected to the main board (7).

3. The planar transformer (1) according to claim 2, characterized in that The through hole penetrates a side wall of the PCB board (5) to form an opening (52), a portion of the connecting portion (61) is inserted into the through hole, and another portion of the connecting portion (61) extends out of the through hole through the opening (52), so that the cross-sectional area of ​​the connecting portion (61) is greater than or equal to the cross-sectional area of ​​the extending portion (62).

4. The planar transformer (1) according to claim 2, characterized in that The connecting portion (61) is completely inserted into the through hole, and the cross-sectional area of ​​the connecting portion (61) is smaller than the cross-sectional area of ​​the extending portion (62).

5. The planar transformer (1) according to claim 1, characterized in that The planar transformer (1) further comprises a main board (7) arranged on one lateral side of the magnetic core (3); the extension direction of the connecting portion (61) and the extension direction of the extending portion (62) are parallel to each other; the pin (6) further comprises a first intermediate portion (63); one end of the connecting portion (61) is connected to one end of the extending portion (62) via the first intermediate portion (63); the other end of the connecting portion (61) is connected to the main board (7); and the other end of the extending portion (62) is connected to the main board (7).

6. The planar transformer (1) according to claim 5, characterized in that The pin (6) further comprises a second middle portion (64), the other end of the connecting portion (61) is connected to the other end of the extending portion (62) via the second middle portion (64), and the second middle portion (64) is connected to the main board (7).

7. The planar transformer (1) according to claim 6, characterized in that The through hole penetrates through a side wall of the PCB board (5) to form an insertion opening (53), and the connecting portion (61) is at least partially disposed in the through hole through the insertion opening (53).

8. The planar transformer (1) according to claim 5, characterized in that The connecting portion (61) and the extending portion (62) are both located on the same side of the magnetic core (3).

9. The planar transformer (1) according to any one of claims 1 to 8, characterized in that: The pin (6) comprises a first pin (6a) and a second pin (6b), and the first pin (6a) and the second pin (6b) both comprise the connecting portion (61) and the extending portion (62), the connecting portion (61) of the first pin (6a) being located on one side of the supporting column (31), and the connecting portion (61) of the second pin (6b) being located on the other side opposite to the supporting column (31).

10. An electronic device, characterized in that: Comprising a planar transformer (1) as claimed in any one of claims 1 to 9.

Images