Pin structure of planar transformer and planar transformer
By using the PIN pin structure of knob, insertion section and stop in the planar transformer, the shortcomings of traditional planar transformers in terms of production efficiency, temperature adaptability and overall line cost are solved, and a more efficient, reliable and economical manufacturing process is achieved. .
Patent Information
- Application Number
- CN202411544868.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-02-18
AI Technical Summary
Traditional planar transformers have shortcomings in terms of production efficiency, temperature adaptability and whole line costs, especially in the context of miniaturization and intelligent development.
A new plane transformer PIN pin structure is adopted, which includes a knob, an insertion section and a stop portion, and the stable mechanical connection between the Pin pin and the copper foil or PCB board is achieved through the design of the knob and the stop portion.
Improves production efficiency, reduces the risk of temperature adaptability, reduces the cost of the whole line, and enhances the reliability and high temperature adaptability of the product.
Smart Images
Figure CN119480372A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of planar transformers, and in particular to a planar transformer PIN needle structure. Background Art
[0002] In the traditional planar transformer structure, mechanical constraints cannot be achieved in the height direction between the layers of copper foil, and between the copper foil or PCB board and the pin needle. Therefore, based on the requirement of stable electrical connection, it is generally necessary to use a welding process to assemble and press the layers of copper foil, and then use a pin welding process to press the pin needle and the copper foil semi-finished product or PCB board for assembly and welding.
[0003] Traditional planar transformers use pin soldering to connect pins with copper foil or PCB boards. Although the process is mature and reliable, its limitations are becoming increasingly prominent as electronic devices become smaller and smarter. The main problems include:
[0004] ① Low production efficiency: Multiple welding assemblies and too many key process control points restrict the improvement of production efficiency.
[0005] ②Poor temperature adaptability: The solder paste melts in a high temperature environment, and the risk of pin falling off increases, which places great restrictions on the selection of solder paste and the setting of the furnace temperature curve.
[0006] ③ High cost of the entire line: Pin coplanarity requirements are achieved by relying on jigs or positioning mechanisms, and the jigs are baked with the products. The number of jigs needs to increase with production capacity, resulting in rising costs.
[0007] It should be noted that the information disclosed in the above background technology section is only used for understanding the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention
[0008] In order to make up for the deficiencies of the prior art, the present invention provides a planar transformer PIN needle structure and a planar transformer.
[0009] The present invention adopts the following technical solution:
[0010] In a first aspect, a planar transformer PIN needle structure is provided, which is used for connecting between multiple layers of copper foil or between copper foil and a PCB board, and includes a knob, an insertion section and a stopper, wherein the knob is connected to the upper part of the insertion section and the knob has a protruding section that exceeds the outer edge of the upper part of the insertion section, and the stopper is connected to the lower part of the insertion section, and the outer edge of the stopper exceeds the outer edge of the lower part of the insertion section.
[0011] In some embodiments, the present invention also has the following technical features:
[0012] The planar transformer PIN needle structure also includes a PIN needle body, the top surface of the PIN needle body is connected to the bottom surface of the insertion section, the outer edge of the top surface of the PIN needle body exceeds the outer edge of the bottom surface of the insertion section, and the exceeding part is a thrust surface, and the thrust surface serves as the stop portion.
[0013] The planar transformer PIN needle structure also includes a second knob, which is connected to the lower part of the insertion section and has a second protruding section exceeding the outer edge of the lower part of the insertion section, and the second protruding section serves as the stopper.
[0014] The knob is arranged on the top surface of the insertion section.
[0015] The upper portion of the insertion section is provided with an insertion hole, and the knob is inserted into the insertion hole.
[0016] The second knob is arranged on the bottom surface of the insertion section; or the lower part of the insertion section has a second insertion hole, and the second knob is inserted into the second insertion hole.
[0017] The knob and the second knob are in the shape of long strips and are parallel to each other.
[0018] The height of the insertion section is 0.05-2 mm greater than the thickness of the applied multi-layer copper foil and / or PCB board.
[0019] In a second aspect, a planar transformer is provided, comprising a plurality of layers of copper foil, a PCB board, and the planar transformer PIN needle structure described in the first aspect, wherein the plurality of layers of copper foil and the copper foil and the PCB board are connected via the planar transformer PIN needle structure, and the PIN needle holes on the copper foil and the PCB board both have a clearance groove that cooperates with a knob of the planar transformer PIN needle structure, the shape of the clearance groove matches the shape of the protruding section of the knob, and the length of the knob is greater than the diameter of the non-avoidance position of the PIN needle hole.
[0020] In some embodiments, the area of the avoidance groove is larger than the area of the protruding section of the knob.
[0021] The present invention has the following advantages or beneficial effects: the planar transformer PIN pin structure of the present invention can realize the stable mechanical connection between the PIN pin and the copper foil or PCB board, which not only ensures the product reliability, but also reduces the difficulty of the process, and brings new possibilities for the manufacture of planar transformers. The planar transformer PIN pin structure of the present invention is designed with a knob and a stopper on the PIN pin, and the PIN pin hole of the copper foil or PCB board is designed with an air avoidance groove that cooperates with the PIN pin knob. The PIN pin knob is inserted into the PIN pin hole air avoidance groove of the copper foil or PCB board and then rotated a certain angle, so that the PIN pin knob and the PIN pin thrust surface jointly clamp the multi-layer copper foil or PCB board, thereby realizing the stable pressing between the multi-layer copper foil and the tight connection between the PIN pin and the copper foil or PCB board. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A schematic diagram of a planar transformer PIN needle structure in one embodiment of the present invention;
[0023] Figure 2 is a schematic diagram of a planar transformer PIN needle structure in another embodiment of the present invention;
[0024] Figure 3 A schematic diagram of a planar transformer PIN needle structure in another embodiment of the present invention;
[0025] Figure 4 It is a schematic structural diagram of the copper foil with air-avoiding grooves of the planar transformer in Example 1 of the present invention;
[0026] Figure 5 This is a schematic structural diagram of a PCB board with a clearance groove of a planar transformer in Embodiment 1 of the present invention;
[0027] Figure 6 Schematic diagram of the structure of the planar transformer in Example 1 of the present invention. DETAILED DESCRIPTION
[0028] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the present invention. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.
[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing as well as for coupling or communication.
[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.
[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0032] A specific embodiment of the present invention provides a planar transformer PIN needle structure, which is used to connect multiple layers of copper foil and / or PCB boards, and includes a knob, an insertion section and a stopper, wherein the knob is connected to the upper portion of the insertion section and the knob has a protruding section that exceeds the outer edge of the upper portion of the insertion section, and the stopper is connected to the lower portion of the insertion section, and the outer edge of the stopper exceeds the outer edge of the lower portion of the insertion section.
[0033] In some embodiments, Figure 1 and 2 As shown, the planar transformer PIN needle structure includes a knob 1, an insertion section 2 and a PIN needle body 3, the knob 1 is connected to the upper part of the insertion section 2 and both ends of the knob 1 have protruding sections 11 that exceed the outer edge of the upper part of the insertion section 2, the top surface of the PIN needle body 3 is connected to the bottom surface of the insertion section 2, the outer edge of the top surface of the PIN needle body 3 exceeds the outer edge of the bottom surface of the insertion section 2, and the exceeding part is a thrust surface 31, and the thrust surface 31 serves as the stop portion.
[0034] In some embodiments, Figure 1 As shown, the knob 1 is formed on the top surface of the insertion section 2.
[0035] In other embodiments, Figure 2 As shown, an insertion hole 21 is provided at the upper portion of the insertion section 2 , the knob 1 is inserted into the insertion hole 21 , and the protruding section 11 is located outside the insertion hole 21 .
[0036] In some embodiments, Figure 3As shown, the planar transformer PIN needle structure includes a knob 1, an insertion section 2 and a second knob 4, the knob 1 is connected to the upper part of the insertion section 2, and the two ends of the knob 1 respectively have a protruding section 11 that exceeds the outer edge of the upper part of the insertion section 2, the second knob 4 is connected to the lower part of the insertion section 2, and the two ends of the second knob 4 respectively have a second protruding section 41 that exceeds the outer edge of the lower part of the insertion section 2, and the second protruding section 41 serves as the stopper.
[0037] In some embodiments, Figure 3 As shown, the second knob 4 is arranged on the bottom surface of the insertion section 2.
[0038] In some other embodiments, the lower portion of the insertion section 3 has a second insertion hole, and the second knob is inserted into the second insertion hole (not shown, and its structure is similar to that of Figure 2 The connection mode between the knob 1 and the insertion hole 21 at the upper part of the insertion section 3).
[0039] In some embodiments, Figure 3 As shown, the knob 1 and the second knob 4 are both in the shape of long strips and are parallel to each other.
[0040] In some embodiments, the height of the insertion section is 0.05-2 mm greater than the thickness of the applied multi-layer copper foil and / or PCB board.
[0041] The specific embodiment of the present invention also provides a planar transformer, which includes a multi-layer copper foil 5, a PCB board 6 and the planar transformer PIN needle structure, such as Figure 4 The PIN pinhole 51 on the copper foil 5 shown in FIG. Figure 5 The PIN pin holes 61 on the PCB board 6 shown have a clearance groove 7 that cooperates with the knob of the planar transformer PIN pin structure (the knob refers to knob 1, and may also refer to the second knob 4). The shape of the clearance groove 7 matches the shape of the protruding section of the knob, and the length of the knob is greater than the diameter of the PIN pin hole at the position without clearance.
[0042] In some embodiments, the area of the avoidance groove 7 is larger than the area of the protruding section of the knob.
[0043] Example 1
[0044] like Figure 6 As shown in FIG. 1 , a planar transformer product implementation example using a multi-layer copper foil stack structure with the above-mentioned planar transformer PIN pin structure is shown. The primary side of the planar transformer is composed of four layers of copper foil, each layer is formed by a stamping process, and the PIN pin hole 51 and the air-avoiding groove 7 of the copper foil 5 can be stamped. The structural schematic diagram is shown in FIG. Figure 4The secondary coil of the planar transformer adopts a PCB board, and the pin hole 61 of the PCB board 6 is also designed with a gap 7. After the PCB board is pressed, the gap 7 is milled out by a milling machine or CNC. Its structure is as shown in FIG. Figure 5 The PIN structure used in this example is as shown. Figure 1 and Figure 3 As shown, Figure 1 The PIN structure shown is used to connect the PCB board and the copper foil. Figure 3 The PIN structure shown is used for connection between copper foils. In this example, Figure 1 The PIN pin structure shown in the figure is manufactured by the following process: the diameter of the PIN pin is 0.5 mm larger than the diameter of the PIN pin hole. The insertion section 2 and the thrust surface 31 are first machined by a lathe. The height H of the insertion section 2 is greater than the total thickness of the four layers of copper foil by 0.1 mm. The 2 / 3 of the protruding part of the top of the PIN pin is milled off by a milling machine, and the remaining 1 / 3 of the part protruding from the insertion section is used as the knob 1. The obtained PIN pin structure is shown in FIG. Figure 1 shown.
[0045] After rotating the clearance grooves of each layer of copper foil to the position matching the protruding section of the knob of the pin needle, insert the copper foil into the pin needle one by one, and then rotate the pin needle by equipment or manually to rotate the protruding section of the pin needle knob to the position without clearance of the pin needle hole of the copper foil, so that the protruding section of the knob and the thrust surface can clamp each layer of copper foil together.
[0046] The rest of the multi-layer copper foil and PCB board are assembled in the same way to complete the mechanical connection between the entire windings, and then soldering is performed to ensure the electrical connection between the pin needle and the copper foil. Figure 6 shown.
[0047] The above embodiment has the following advantages:
[0048] ① By optimizing the structure of pin needles and copper foils, the assembly between copper foils is completed while assembling the pin needles and copper foils, which reduces the process assembly process and improves production efficiency.
[0049] ② By optimizing the structure of the pin needle and copper foil or PCB board, the pin needle can be self-positioned in the copper foil or PCB board, eliminating the need for fixtures, reducing dependence on fixtures, and reducing production costs. Since the use of fixtures is reduced, resource consumption is reduced, which is in line with the concept of environmental protection and energy saving.
[0050] ③ By optimizing the structure of the pin needle and copper foil or PCB board, the mechanical connection between the pin needle and the copper foil or PCB board is achieved, which reduces the risk of the pin needle falling off at high temperature, improves product reliability, adapts to different working environments and usage conditions, and enhances high temperature adaptability.
[0051] These advantages will give the new structure planar transformer a clear competitive advantage in both manufacturing and use.
[0052] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope of protection of the patent application.
Claims
1. A planar transformer PIN needle structure, characterized in that: The planar transformer PIN needle structure is used for connecting multiple layers of copper foil or between copper foil and a PCB board, and includes a knob, an insertion section and a stopper, wherein the knob is connected to the upper part of the insertion section and has a protruding section that exceeds the outer edge of the upper part of the insertion section, and the stopper is connected to the lower part of the insertion section, and the outer edge of the stopper exceeds the outer edge of the lower part of the insertion section.
2. The planar transformer PIN needle structure according to claim 1, characterized in that: It also includes a PIN needle body, the top surface of which is connected to the bottom surface of the insertion section, the outer edge of the top surface of the PIN needle body exceeds the outer edge of the bottom surface of the insertion section, and the exceeding part is a thrust surface, which serves as the stop portion.
3. The planar transformer PIN needle structure according to claim 1, characterized in that: It also includes a second knob, which is connected to the lower part of the insertion section and has a second protruding section that exceeds the outer edge of the lower part of the insertion section, and the second protruding section serves as the stopper.
4. The planar transformer PIN needle structure according to claim 1, characterized in that: The knob is arranged on the top surface of the insertion section.
5. The planar transformer PIN needle structure according to claim 1, characterized in that: The upper portion of the insertion section is provided with an insertion hole, and the knob is inserted into the insertion hole.
6. The planar transformer PIN needle structure according to claim 3, characterized in that: The second knob is arranged on the bottom surface of the insertion section; or the lower part of the insertion section has a second insertion hole, and the second knob is inserted into the second insertion hole.
7. The planar transformer PIN needle structure according to claim 3, characterized in that: The knob and the second knob are in the shape of long strips and are parallel to each other.
8. The planar transformer PIN needle structure according to claim 1, characterized in that: The height of the insertion section is 0.05-2 mm greater than the thickness of the applied multi-layer copper foil and / or PCB board.
9. A planar transformer, characterized in that: It comprises a multi-layer copper foil, a PCB board and the planar transformer PIN needle structure according to any one of claims 1 to 8, wherein the multi-layer copper foil and the copper foil and the PCB board are connected through the planar transformer PIN needle structure, the copper foil and the PIN needle holes on the PCB board have a clearance groove that cooperates with the knob of the planar transformer PIN needle structure, the shape of the clearance groove matches the shape of the protruding section of the knob, and the length of the knob is greater than the diameter of the non-clearance position of the PIN needle hole.
10. The planar transformer according to claim 9, characterized in that: The area of the air-avoiding groove is larger than the area of the protruding section of the knob.