A magnetic device sinking structure

Abstract

The application discloses a sinking structure of a magnetic device, which comprises a framework body, a winding slot arranged on the framework body, magnetic cores arranged on the upper and lower ends of the framework body, and PIN pins arranged on the two sides of the framework body, wherein the PIN pins are bent along one side of the winding slot to form an L-shaped structure, and the winding slot on the side of the PIN pin bending direction and the top of the magnetic core can sink along a sinking hole on a PCB. The effective height of the bottom of the magnetic device relative to the PCB can be sunk without changing the size of the PCB, so that the bottom of the magnetic device protrudes more to the bottom surface of the PCB, thereby reducing the space on the top of the PCB.

Description

Technical Field

[0001] This invention relates to the technical field of magnetic core devices, and specifically to a submerged structure for magnetic devices. Background Technology

[0002] Currently, with the trend towards larger and thinner TVs and displays, the demand for thinner and lighter switching power supplies is a market trend. For example, the LLC topology switching power supply used in wallpaper TVs needs to be as thin as possible. However, the PCB circuit board of a switching power supply inevitably contains transformers, inductors (PFC, BOOST, BUCK), common-mode inductors, current transformers, and other magnetic components, and these magnetic components, such as… Figure 1 As shown, it typically consists of at least one frame, winding groove, coil, magnetic core, and PIN pins. To ensure the winding of the winding groove is not affected, the PIN pins are oriented in the opposite direction to the winding groove. After installation, the maximum depth that the pins sink into the PCB board is the area below the pins. From the pins to the winding groove and above, the pins cannot sink further. This means that when the installation space of the product's switching power supply needs to meet the vertical installation height of the PCB board, sufficient height needs to be reserved on the top surface to accommodate the magnetic components. However, often the top surface height of the magnetic components is the highest point of the top surface space, which prevents the overall installation space of the product's switching power supply area from being further reduced, making it difficult to further flatten and thin TVs and displays.

[0003] To reduce the overall height of magnetic components and thus the height of switching power supplies, a crab-leg structure PIN pin design has been developed in recent years. Figure 2 As shown, the PIN pin is first bent in the direction of the winding groove and then bent in the opposite direction, so that the bottom of the magnetic device can be better sunk into the PCB board. However, the sinking depth of this structure is limited, and the requirements for the size of the PCB board and the opening size of the sinking hole are also larger. Therefore, in order to sink the magnetic device into a larger PCB board size, make full use of the bottom space of the PCB board, and at the same time ensure that the size of the PCB board is not inconvenient, the structure of the magnetic device needs to be improved. Summary of the Invention

[0004] In order to solve one or more technical problems existing in the prior art, the purpose of this application is to provide a magnetic device sinking structure that can achieve an effective height reduction of the bottom of the magnetic device relative to the PCB board without changing the PCB board size, so that the bottom of the magnetic device protrudes more towards the bottom surface of the PCB board, thereby reducing the top space of the PCB board and reducing the opening size of the PCB board.

[0005] To solve the aforementioned technical problems, this application adopts the following technical solution: A sinking structure for a magnetic device, the magnetic device including a skeleton body, a winding groove on the skeleton body, a magnetic core at the upper and lower ends of the skeleton body, and PIN pins on both sides of the skeleton body. The PIN pins are bent along one side of the winding groove to form an L-shaped structure. The winding groove and the top of the magnetic core on the side of the bending direction of the PIN pins can sink along sinking holes on a PCB board.

[0006] Because the existing magnetic devices have pins on both sides bent or extended in the opposite direction of the winding groove, it is difficult to achieve effective sinking even after sinking holes are opened on the PCB board, resulting in a large height difference at the top of the PCB board. Even with a crab-leg structure for pin sinking, the sinking height is generally limited, and the pin forming process is difficult, requiring a larger PCB board and sinking hole area compared to an L-shaped structure. However, when the pins on both sides of the magnetic device are bent along one side of the winding groove to form an L-shaped structure, this problem can be effectively solved, effectively increasing the sinking height at the bottom of the magnetic device. This allows for better adjustment of the height of the protrusions on the top and bottom sides of the PCB board, reducing the required installation space height and resulting in a thinner thickness when TVs and displays are made larger and thinner.

[0007] Preferably, the skeleton body is further provided with several detachable limiting parts, the magnetic device is fixed to the PCB board by the limiting parts, and the sinking distance of the magnetic device is precisely controlled by the limiting parts.

[0008] Because the height of the protrusion at the bottom of a typical product used to fix a PCB board must be precisely controlled, and since switching power supplies are assembly components, inaccurate control of the protrusion dimensions on both sides can easily lead to installation problems and make subsequent adjustments difficult. Using conventional limiting structures for assembly is not only difficult to operate and costly to improve, but also prone to dimensional errors, resulting in downgrades in batches. Therefore, to ensure the proper sinking distance of the magnetic components on the PCB board, limiting components are placed between the PCB board and the magnetic components. When the magnetic components are installed on the PCB board, their height is first limited by the limiting components before the pins are soldered and fixed. This effectively solves the above problems and allows for precise control of the distance the magnetic components sink to the bottom of the PCB board.

[0009] Preferably, the PIN pin is straight before the enameled wire is wound around it, and then the PIN pin is bent after the enameled wire is wound around it.

[0010] Existing PIN pins are generally pre-formed before winding the enameled wire. Although the process is mature and low-cost for enterprises, as they can be directly purchased, it also limits the settling of magnetic devices. Moreover, if the PIN pins are pre-formed, the difficulty of winding the enameled wire increases, and the process becomes more complex. Therefore, in order to ensure that the improved structure does not increase the difficulty of the process, the PIN pins on both sides of the frame body adopt a straight structure that extends outward in the early stage, thereby ensuring the normal winding of the enameled wire in the winding groove without affecting the construction difficulty. The PIN pins are bent after the enameled wire is wound. Compared with the original process, there are fewer additional processes, and the versatility is strong. For enterprises, the forming equipment is simple and widely available. The self-bending process can be popularized even without the initial bending and forming.

[0011] Preferably, the limiting component includes an elongated limiting member and a C-shaped groove provided on the limiting member, the two ends of the C-shaped groove forming a locking groove that engages with the skeleton body.

[0012] Preferably, an L-shaped groove is symmetrically provided on both sides of the skeleton body, the L-shaped groove is located on both sides of the PIN pin mounting part, and the two ends of the limiting member are fixed in the L-shaped groove.

[0013] The limiting component adopts a long strip structure. When fixing, only two pieces are needed to achieve stable fixation. The downward-recessed C-shaped groove can also effectively reduce the overall weight. Through the cooperation of the L-shaped sliding groove and the locking groove, it can achieve effective limiting and fixing, and also make installation simple and convenient.

[0014] Preferably, the L-shaped groove is provided with a wedge-shaped protrusion, and the slot forms an interference fit through the wedge-shaped protrusion.

[0015] Preferably, the slot is provided with a protruding limiting block, which slides along the wedge-shaped protrusion and passes through it to form an interlaced structure.

[0016] When limiting parts are engaged via an L-shaped groove and a retaining slot, the sliding connection inevitably leads to the sliding part slipping out in the reverse direction. Using a conventional interference fit for assembly is not only difficult but also prone to causing aging and damage to the plastic parts under long-term stress, thus compromising their lifespan. Therefore, the L-shaped groove and retaining slot are secured by a wedge-shaped protrusion and a limiting block. After the retaining slot slides into the L-shaped groove, it forms an interference fit with the wedge-shaped protrusion, while simultaneously maintaining a clearance fit with the retaining slot. This effectively prevents the parts from detaching after assembly and avoids stress damage caused by prolonged interference fit between the wedge-shaped protrusion and the retaining slot.

[0017] Preferably, the limiting component includes a limiting member that protrudes outward on one side and a slot provided on the limiting member, wherein the limiting member is detachably mounted on the skeleton body through the slot.

[0018] Preferably, the corner of the skeleton body is provided with a U-shaped groove, and the groove is provided with a protruding U-shaped block. The U-shaped groove and the U-shaped block are fitted with a clearance.

[0019] Preferably, the upper and lower sides of the corner of the skeleton body are provided with an inwardly recessed U-shaped groove, and the U-shaped grooves on the upper and lower sides are staggered. The upper sides of the slot are provided with an inwardly protruding U-shaped block.

[0020] The gap fit between the U-shaped groove and the U-shaped locking block can limit the left and right displacement of the skeleton body and the limiting parts.

[0021] Preferably, the slot is further provided with a limiting hole, and the skeleton body is provided with a limiting protrusion that cooperates with the limiting hole. The limiting hole and the limiting protrusion are interference fit.

[0022] When installing magnetic devices and limiting parts, a slight interference fit between the limiting protrusions and limiting holes can prevent the parts from falling off.

[0023] Preferably, the magnetic device is an inductor, which includes a skeleton body with the winding groove, magnetic cores disposed at the upper and lower ends of the skeleton body, and PIN pins disposed on both sides of the skeleton body and bent into an L-shape along one side of the winding groove.

[0024] Preferably, the magnetic device is a transformer, which includes two stacked skeleton bodies, a winding groove on the skeleton body, a magnetic core at the upper and lower ends of the skeleton body, and PIN pins bent into an L-shape along one side of the winding groove on both sides of the skeleton body. The two stacked skeleton bodies are a secondary skeleton and a primary skeleton. The PIN pins are located on the secondary skeleton, and the limiting part is detachably located on the secondary skeleton.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When mounting magnetic components on a PCB board, the PIN pins on the magnetic components are bent into an L-shape towards the winding groove, allowing the magnetic components to sink deeper into the through-holes on the PCB board. By fully utilizing the space at the bottom of the PCB board, the height of the upper surface protrusion on the PCB board can be reduced even further. This effectively solves the problem that the upper surface protrusion height of existing magnetic components cannot be effectively reduced after mounting on the PCB board. This further reduces the internal installation space of LLC topology switching power supplies, resulting in higher space utilization. When applied to products such as wallpaper TVs, the overall thickness will not be high due to the inability to further reduce the thickness of LLC topology switching power supplies.

[0026] Second, by combining with limiting components, it can also solve the problem of difficulty in controlling the sinking depth of PIN pins after reverse bending. It can not only effectively improve the sinking depth of magnetic devices relative to the PCB board, but also accurately control the sinking depth distance, making the height of the protrusions on both sides of the PCB board more precisely controlled.

[0027] Third, compared to the crab-leg-shaped PIN magnetic device, the improved magnetic device has PIN pins on both sides bent along one side of the winding groove to form an L-shaped structure. When the magnetic device is sunk, the opening size on the PCB can be smaller, so that the size of the PCB board does not need to be increased, and the overall volume is smaller. By fully sunk the magnetic device, the magnetic device can achieve a high degree of flatness, which not only meets the flatness requirements of the power board, but also makes full use of the height space to maximize the power density of the switching power supply. Attached Figure Description

[0028] Figure 1 This is a side view of a magnetic device with a standard L-shaped pin and a PCB board assembly, showing its maximum depression state. Figure 2 A side cross-sectional view of the PIN magnetic component with a crab leg structure assembled with a PCB board, showing the depth of the magnetic component's recess; Figure 3 A schematic diagram of an existing crab-leg-structure PIN transformer. Figure 4 This is a cross-sectional view of the combination of the inductor and the PCB board in this invention; Figure 5 This is an exploded view of the transformer and PCB board in this invention; Figure 6 This is a diagram showing the combination of the transformer and the PCB board in this invention; Figure 7 This is an exploded view of the transformer and PCB board in this invention; Figure 8This is a diagram showing the combination of the transformer and the PCB board in this invention; Figure 9 This is a partially enlarged exploded view of the U-shaped groove and U-shaped block in this invention; Figure 10 The exploded view of the transformer in the invention shows the connection structure between the secondary frame and the primary frame; In the diagram: 1. PCB board; 2. Skeleton body; 3. Magnetic core; 4. Magnetic components; 5. Winding groove; 6. PIN pin; 7. Sinking hole; 8. Limiting component; 9. Limiting element; 10. C-groove; 11. Limiting block; 12. Slot; 13. L-shaped slide; 14. Wedge-shaped protrusion; 15. Secondary skeleton; 16. Primary skeleton; 17. Limiting protrusion; 18. U-shaped slide; 19. Limiting hole; 20. U-shaped block; 21. Stepped groove; 22. Wire hole; 23. Positioning protrusion; 24. Positioning groove; 25. Primary coil; 26. Secondary coil. Detailed Implementation

[0029] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. Example 1:

[0032] like Figures 4-6As shown, a magnetic device 4 has a recessed structure. The magnetic device 4 includes a frame body 2, a winding groove 5 on the frame body 2, a magnetic core 3 at the upper and lower ends of the frame body 2, and PIN pins 6 on both sides of the frame. The PIN pins 6 are bent along one side of the winding groove 5 to form an L-shaped structure. The top of the winding groove 5 and the magnetic core 3 on the side of the bending direction of the PIN pins 6 can be recessed along the sinking holes 7 on the PCB board. The frame body 2 is also provided with several detachable limiting parts 8. The magnetic device 4 is fixed to the PCB board 1 by the limiting parts 8. The recessed distance of the magnetic device 4 is precisely controlled by the limiting parts 8. The PIN pins 6 are straight before the enameled wire is wound, and the PIN pins 6 are bent after the enameled wire is wound.

[0033] To avoid affecting the winding of the winding groove 5, the magnetic components 4 currently mounted on the switching power supply PCB circuit board have their pins 6 oriented in the opposite direction of the winding groove 5. Although this doesn't affect production after the pins 6 are bent and shaped, it significantly impacts the top protrusion height of the PCB circuit board. This means that when the product's switching power supply mounting space needs to simultaneously meet the vertical mounting height of the PCB board, sufficient height must be reserved on the top surface to accommodate the magnetic components 4. Consequently, the overall mounting space of the switching power supply area cannot be further reduced, hindering the further thinning of large-size TVs and displays. Even with a "crab leg" pin structure, it's difficult to reduce the height of the mounting space on the PCB board 1 without increasing its area. Therefore, this application breaks with conventional thinking and improves the existing magnetic device 4 under the premise of lowest modification cost and greatest ease of operation. The improvement method is as follows: First, the bending direction of the PIN pin 6 of the existing magnetic device 4 is changed so that it bends along one side of the winding groove 5 to form an L-shaped structure, thereby greatly increasing the sinking height of the magnetic device 4 and effectively solving the problem of low and uncontrollable sinking depth of the existing structure. Second, the bending timing of the PIN pin 6 is adjusted, changing from bending it in the early stage to using a straight PIN pin 6 in the early stage. Bending the PIN pins 6 after winding the enameled wire ensures that the magnetic device 4 can be wound smoothly through existing equipment, while also making the bending and forming of the PIN pins 6 convenient. The low difficulty in bending and forming the PIN pins 6 allows for effective control of the production process steps and costs of the magnetic device 4. When it is used inside the LLC topology switching power supply, the installation space is further reduced, resulting in higher space utilization. When applied to products such as wallpaper TVs, the problem of high overall thickness due to the inability to further reduce the thickness of the LLC topology switching power supply will not occur. Meanwhile, compared to the magnetic device 4 with crab-leg-shaped PIN pins 6, the improved magnetic device 4 has PIN pins 6 on both sides bent along one side of the winding groove 5 to form an L-shaped structure. When the magnetic device 4 is lowered, the position of the pin hole does not change, so the PCB area does not need to be increased. Since the PIN pins 6 do not need to be lowered, the required opening size on the PCB board 1 is smaller than that of the crab-leg-shaped magnetic device 4. By fully lowering the magnetic device 4, the magnetic device 4 can achieve a high degree of flatness, which not only meets the flatness requirements of the power board, but also makes full use of the height space to maximize the power density of the switching power supply.

[0034] To ensure the sinking depth of the magnetic device 4 when it is installed on the PCB board 1, a limiting part 8 is used to assemble the frame body 2 and the PCB board 1. The magnetic device 4 not only serves to limit and fix the device, but also to precisely control the sinking distance of the bottom of the magnetic device 4. By combining the reverse bending of the PIN pin 6 with the limiting part 8, the problem of difficulty in controlling the sinking depth after the reverse bending of the PIN pin 6 is effectively solved. This not only effectively improves the sinking depth of the magnetic device 4 relative to the PCB board 1, but also precisely controls the sinking depth distance, making the height of the protrusions on both sides of the PCB board 1 more precisely controlled. Example 2:

[0035] like Figure 4 and 5 As shown, a PFC inductor recessed structure is further improved based on embodiment 1, wherein the magnetic device 4 is a PFC inductor, the PFC inductor includes a skeleton body 2 with the winding groove 5, a magnetic core 3 disposed at the upper and lower ends of the skeleton body 2, and PIN pins 6 disposed on both sides of the skeleton body 2 bent along one side of the winding groove 5 to form an L-shaped structure, and also includes a PCB board 1, the PCB board 1 is provided with a recessed hole 7, and one side of the PFC inductor is located in the recessed hole 7.

[0036] With the trend towards larger and thinner TVs and displays, the demand for thinner and lighter LLC topology switching power supplies is a market trend. For example, the LLC topology switching power supplies used in wallpaper TVs need to be as thin as possible. Currently, LLC topology switching circuits use PFC inductors such as... Figure 2As shown, it mainly consists of a frame body 2, a coil, a magnetic core 3, and PIN pins 6. In order to prevent the PIN pins 6 from blocking the winding groove 5, the pins are bent in the opposite direction to the winding groove 5. As a result, after the PFC inductor is installed on the PCB board 1, the upward protrusion is relatively high, and the depth that can be sunk is limited. This causes the height of one side of the LLC topology switching power supply to be affected by its height, which prevents it from being further reduced in size, thus affecting the goal of further thinning of the LLC topology switching power supply. Therefore, the structure and process of the existing PFC inductor are improved so that the pins 6 on both sides of the frame body 2 are bent into an L-shaped structure along one side of the winding groove 5. This allows the PFC inductor protrusion with the winding groove 5 to sink downward along the sinking hole 7 on the PCB board 1 after it is mounted on the PCB board 1. Since the pins 6 on the PFC inductor are bent into an L-shaped structure towards the winding groove 5, the sinking depth of one end of the PFC inductor is controlled by the insertion depth of the pins 6. With the insertion of the pins 6, not only can the top magnetic core 3 be embedded into the sinking hole 7, but the winding groove 5 can also sink into the sinking hole 7. This allows the PFC inductor to sink to a greater height in the sinking hole 7, and the height of the protrusion on the upper surface of the PCB board 1 can be reduced.

[0037] Although PFC inductors can be fixed by soldering with pins 6, the sinking depth of the PFC inductor cannot be precisely controlled during the production process. Furthermore, the downward protrusion height after sinking is generally limited, easily leading to excessively high or low protrusions on the lower end after installation. This makes precise height control of the installation space impossible. To solve this problem, several limiting parts 8 are added between the frame body 2 and the PCB board 1. When combined with the limiting parts 8, not only is the sinking depth of the PFC inductor relative to the PCB board 1 effectively increased, but the sinking depth distance is also precisely controlled, resulting in more precise control of the protrusion height on both sides of the PCB board 1. The bottom of the limiting parts 8 is attached to the PCB board 1, thus preventing the aforementioned problems from occurring after the PFC inductor is installed via the limiting parts 8. By controlling the sinking depth, the space on one side of the bottom surface of PCB 1 can be effectively utilized. This solves the problem that the upper protrusion height of existing PFC inductors cannot be effectively reduced after installation on PCB 1, while the bottom space is largely wasted. This further reduces the internal installation space of the LLC topology switching power supply, resulting in higher space utilization. When applied to products such as wallpaper TVs, the overall thickness will not be high due to the inability to further reduce the thickness of the LLC topology switching power supply. During the production process, pin 6 is initially straight and is bent only after the entire PFC inductor is assembled, ensuring that the winding process proceeds normally without affecting the winding.

[0038] A further improvement is made in that the limiting part 8 includes an elongated limiting part 9 and a C-shaped groove 10 provided on the limiting part 9, the two ends of the C-shaped groove 10 forming a locking groove 12 that engages with the skeleton body 2; the skeleton body 2 is provided with an L-shaped sliding groove 13 symmetrically on both sides, the L-shaped sliding groove 13 is located on both sides of the PIN pin 6 mounting part, and the two ends of the limiting part 9 are fixed in the L-shaped sliding groove 13.

[0039] The limiting component 8 adopts a long strip structure, and a downwardly recessed L-shaped groove 13 is symmetrically formed on both sides of the mounting part of the PIN pin 6. After the two ends of the limiting component 8 slide into the L-shaped groove 13, it is suspended and fixed in the L-shaped groove 13. After installation, the PFC inductor can be stably fixed by the two limiting components 9, which improves the installation stability. In particular, when designing the connection of the limiting component 8, its top surface forms a downwardly recessed C-shaped groove 10, which can effectively reduce the overall weight. At both ends of the C-shaped groove 10, there are locking slots 12 that engage with the L-shaped groove 13. During the connection process, the sliding cooperation between the L-shaped groove 13 and the locking slots 12 can achieve effective limiting and fixing, and also make the installation simple and convenient.

[0040] A further improvement is that the L-shaped groove 13 is provided with a wedge-shaped protrusion 14, and the slot 12 forms an interference fit through the wedge-shaped protrusion 14.

[0041] Since there is no limiting structure between the L-shaped slide groove 13 and the slot 12 after assembly, the limiting part 9 can easily slide out along the sliding direction, which affects the assembly accuracy during assembly. Therefore, an upward-protruding wedge-shaped protrusion 14 is formed on the bottom surface of the L-shaped slide groove 13. After the slot 12 slides into the L-shaped slide groove 13, it forms an interference fit through the wedge-shaped protrusion 14, which can effectively prevent the phenomenon of it falling off after assembly.

[0042] A further improvement is that the slot 12 is provided with a protruding limiting block 11, which slides along the wedge-shaped protrusion 14 and passes through it to form an interlaced structure.

[0043] To prevent the limiting component 9 from sliding after installation, a protruding limiting block 11 is formed in the slot 12. During assembly, the limiting block 11 first enters the L-shaped slide groove 13, then slides inward along the inclined surface of the wedge-shaped protrusion 14 to form an interference fit with the highest point. After being pushed in further, the limiting block 11 passes through the wedge-shaped protrusion 14 and slides back into the slot 12. This results in one side of the limiting block 11 and the rear side of the wedge-shaped protrusion 14 being staggered, while the wedge-shaped protrusion 14 itself forms a clearance fit with the slot 12. This avoids the problem of stress damage caused by the wedge-shaped protrusion 14 being in a long-term interference fit with the slot 12. Example 3:

[0044] Currently, ultra-thin transformers are used in LLC topology switching circuits, such as Figure 3 As shown, it generally includes a secondary frame 15, a primary frame 16, a secondary coil 26, a primary coil 25, a top V-shaped magnetic core 3, a bottom E-shaped magnetic core 3, safety tape, and PIN pins 6. As shown in patent 202120023281.8, its PIN pins 6 are bent in the opposite direction to the primary frame 16. However, because the transformer used in existing LLC topology switching power supplies requires two frames (inner and outer cores), and the design of PIN pins 6 leads to the following problems when the existing transformer is combined with the LLC topology switching circuit: First, during the installation of existing transformers, since the pins 6 are basically bent into an L-shape, once the PCB board 1 is drilled, it is not easy to control the sinking depth of the transformer. This makes it difficult to control the sinking depth of both the PCB board 1 and the transformer during installation. Furthermore, the bottom protrusions of the transformer have height limitations, making it difficult to control the height of the protrusions on the top and bottom sides of the transformer relative to the PCB board 1 after installation, and making it impossible to achieve the optimal relative position between the two.

[0045] Secondly, the pins of the traditional frame are bent in the opposite direction to the winding groove 5. Although they do not block the winding groove 5, they occupy a large area of ​​the board and require a large opening size on the PCB board 1.

[0046] Therefore, improvements can be made to existing transformers, such as a transformer subsidence structure, such as... Figures 6-8 As shown, based on Embodiment 1, it is further improved in that the magnetic device 4 is a transformer. The transformer includes two stacked skeleton bodies 2, a winding groove 5 on the skeleton body 2, a magnetic core 3 at the upper and lower ends of the skeleton body 2, and PIN pins 6 on both sides of the skeleton body 2 bent along one side of the winding groove 5 to form an L-shaped structure. The two stacked skeleton bodies 2 are a secondary skeleton 15 and a primary skeleton 16. The PIN pins 6 are located on the secondary skeleton 15. The limiting part 8 is detachably located on the secondary skeleton 15. It also includes a PCB board 1. The PCB board 1 is provided with a sinking hole 7. The transformer is fixed on the PCB board 1 through the transformer. One side of the transformer is located in the sinking hole 7. By inserting all the pins 6 onto the secondary frame 15, the pins 6 are bent along the winding slots 5 of the secondary frame 15 to form an L-shaped structure. After being installed on the PCB board 1, there is no overlap with the primary frame 16 in the height direction. The frame body 2 can be lower than the magnetic core 3, so that the combined height of the magnetic core 3 is the height of the entire transformer. This makes the transformer height on the PCB board 1 shorter than that of a traditional transformer by the wall thickness of the primary frame 16. At the same time, with the same secondary slot width and the same winding window as a base, the height space can be reduced by more than 20%. Furthermore, the reverse bending process used to form the bent pins 6, compared to the crab-leg structure of the transformer pins 6, results in... Figure 3 As shown, the board size is smaller, and the hole size on PCB 1 is smaller.

[0047] A further improvement is that the limiting part 8 includes a limiting member 9 protruding outward on one side and a slot 12 provided on the limiting member 9, and the limiting member 9 is detachably installed on the skeleton body 2 through the slot 12.

[0048] During transformer installation, a limiting part 8 is installed at each of the four corners of the transformer. The transformer is composed of limiting parts 9 with slots 12. The limiting parts 9 are detachably installed on the frame body 2 through the slots 12. During assembly, the transformer with limiting parts 9 is fixed to the surface of the PCB board 1 by the outward protrusion on one side of the limiting parts 9. This can effectively fix the transformer while keeping the overall size small and minimizing the increase in weight after the transformer is installed. In addition, the small size of the limiting parts 9 makes it highly flexible to install.

[0049] A further improvement is made in that a U-shaped groove 18 is provided at the corner of the skeleton body 2, and a protruding U-shaped block 20 is provided on the slot 12. The U-shaped groove 18 and the U-shaped block 20 are fitted with a clearance.

[0050] To facilitate the assembly and disassembly of the limiting component 9, it is installed at the corner of the frame body 2, forming a U-shaped groove 18 at the corner, allowing for flexible assembly and disassembly of the limiting component 9. In particular, a protruding U-shaped locking block 20 is formed on the locking slot 12, and the U-shaped groove 18 and the U-shaped locking block 20 adopt a clearance fit, which further enhances the flexibility during assembly and disassembly, avoiding the problem of difficulty in quickly inserting it during assembly.

[0051] A further improvement is made in that the upper and lower sides of the corner of the skeleton body 2 are provided with an inwardly recessed U-shaped groove 18, and the U-shaped grooves 18 on the upper and lower sides are staggered. The upper sides of the slot 12 are provided with an inwardly protruding U-shaped block 20.

[0052] Because of the small size of the limiting component 9, the U-shaped groove 18 and the U-shaped locking block 20 are prone to loosening during installation, resulting in low installation stability after fixing. Therefore, the structural positions of the U-shaped groove 18 and the U-shaped locking block 20 are redesigned so that the U-shaped groove 18 at the corner of the frame body 2 extends in parallel with the upper and lower sides, and at the same time, a U-shaped locking block 20 protruding inward is formed on both sides of the upper side of the locking groove 12. Through the vertical and horizontal distribution and staggered arrangement of the two U-shaped locking blocks 20 and the two U-shaped grooves 18, while ensuring parallel cooperation, the stability after installation can be effectively guaranteed even though it is a gap connection.

[0053] A further improvement is that a limiting hole 19 is provided in the slot 12, and a limiting protrusion 17 that cooperates with the limiting hole 19 is provided on the skeleton body 2. The limiting hole 19 and the limiting protrusion 17 are interference fit.

[0054] After assembly, the sliding rail and the sliding groove may cause the limiting part 9 to slide out and fall off during the assembly process, or the frame body 2 may move left and right after installation. In order to ensure that the limiting part 9 slides after installation and to ensure the stability of the position after installation, a limiting hole 19 is formed in the slot 12. At the same time, a limiting protrusion 17 that is interference-fitted with the limiting hole 19 is provided on the frame body 2. After assembly, the limiting hole 19 can fit over the limiting protrusion 17, thereby ensuring that the limiting part 9 slides after installation.

[0055] like Figure 10As shown, a further improvement is made in that the bottom of the secondary skeleton 15 is provided with an inwardly recessed stepped groove 21, and the bottom of the stepped groove 21 is provided with a wire hole 22. The primary skeleton 16, on which the primary coil 25 is wound, is embedded in the stepped groove 21. The lead wire of the primary coil 25 in the primary skeleton 16 is led out through the wire hole 22 and connected to the PIN pin 6 on one side.

[0056] Currently, to facilitate the connection between the primary coil 25 and the secondary coil 26 and the PIN pins 6, primary and secondary PIN pins 6 are installed on the primary frame 16 and the secondary frame 15, respectively. The primary coil 25 is completely embedded within the secondary frame 15, causing the bottom plane of the magnetic core 3 to be higher than the plane of the secondary frame 15, resulting in an increased overall transformer height. The final transformer height is calculated as: primary frame 16 wall thickness + secondary frame 15 wall thickness * 2 + secondary slot width + magnetic core 3 wall thickness. Therefore, the structure of the transformer frame body 2 is improved. The improved primary frame 16, with the primary coil 25 wound around it, can be embedded in the stepped slot 21 at the bottom of the secondary frame 15. Furthermore, the lead wire of the primary coil 25 can pass through the through-hole 22 from within the stepped slot 21, effectively reducing the thickness of the frame body 2. This also enables the installation of the primary coil 25 on the secondary frame 15 using the PIN pins 6 and facilitates subsequent bending and shaping. During installation, after the primary bobbin 16 winds the primary coil 25, it is inserted into the stepped groove 21 from the bottom of the secondary bobbin 15, so that the top plane of the primary bobbin 16 is close to the secondary bobbin 15. The two ends of the primary coil 25 extend outward from the stepped groove 21 through the wire holes 22, so that the wires run through the top groove of the secondary bobbin 15 and are wound around the primary coil 25 using the PIN pins 6. By improving the structure of the secondary bobbin 15 and the primary bobbin 16, the problem of installing the PIN pins 6 connected to the primary coil 25 from the primary bobbin 16 to the secondary bobbin 15 is solved, and the problem of the overall height of the bobbin body 2 is too high after the primary bobbin 16 with the primary coil 25 wound around it is also solved.

[0057] A further improvement is made in that the stepped groove 21 has several positioning grooves 24 on both sides, and the primary skeleton 16 has positioning protrusions 23 on both sides that match the positioning grooves 24.

[0058] The stepped groove 21 has two outwardly recessed positioning grooves 24 on each side, while the side of the primary frame 16 has corresponding protrusions forming positioning protrusions 23. During the assembly process, the positioning grooves 24 and positioning protrusions 23 work together to ensure the accuracy of the installation position and avoid the problem of left and right movement after installation.

[0059] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A magnetic device recessed structure, the magnetic device (4) comprising a frame body (2), a winding groove (5) disposed on the frame body (2), a magnetic core (3) disposed at the upper and lower ends of the frame body (2), and PIN pins (6) disposed on both sides of the frame, characterized in that: The PIN pin (6) is bent along one side of the winding groove (5) to form an L-shaped structure. The top of the winding groove (5) and the magnetic core (3) on the side of the bending direction of the PIN pin (6) can sink along the sinking hole (7) on the PCB board.

2. The magnetic device sinking structure according to claim 1, characterized in that: The skeleton body (2) is also provided with several detachable limiting parts (8). The magnetic device (4) is fixed on the PCB board (1) by the limiting parts (8). The sinking distance of the magnetic device (4) is precisely controlled by the limiting parts (8).

3. The magnetic device sinking structure according to claim 1, characterized in that: The PIN pin (6) is straight before the enameled wire is wound around it, and the PIN pin (6) is bent after the enameled wire is wound around it.

4. The magnetic device sinking structure according to claim 2, characterized in that: The limiting part (8) includes a long strip-shaped limiting part (9) and a C-shaped groove (10) provided on the limiting part (9). The two ends of the C-shaped groove (10) form a locking groove (12) that engages with the skeleton body (2).

5. The magnetic device sinking structure according to claim 4, characterized in that: The skeleton body (2) is provided with an L-shaped groove (13) on both sides. The L-shaped groove (13) is located on both sides of the PIN pin (6) mounting part. The two ends of the limiting member (9) are fixed in the L-shaped groove (13).

6. The magnetic device sinking structure according to claim 2, characterized in that: The limiting component (8) includes a limiting member (9) protruding outward on one side and a slot (12) provided on the limiting member (9). The limiting member (9) is detachably installed on the skeleton body (2) through the slot (12).

7. The magnetic device sinking structure according to claim 6, characterized in that: The frame body (2) has a U-shaped groove (18) at the corner, and a protruding U-shaped block (20) is provided on the slot (12). The U-shaped groove (18) and the U-shaped block (20) are fitted with a clearance.

8. The magnetic device sinking structure according to claim 7, characterized in that: The frame body (2) has an inwardly recessed U-shaped groove (18) on both the upper and lower sides at the corners, and the U-shaped grooves (18) on the upper and lower sides are staggered. The slot (12) has an inwardly protruding U-shaped block (20) on both the upper sides.

9. The magnetic device sinking structure according to claim 3, characterized in that: The magnetic device (4) is an inductor, which includes a skeleton body (2) with the winding groove (5), a magnetic core (3) at the upper and lower ends of the skeleton body (2), and PIN pins (6) bent along one side of the winding groove (5) on both sides of the skeleton body (2) to form an L-shaped structure.

10. A magnetic device sinking structure according to claim 6, characterized in that: The magnetic device (4) is a transformer. The transformer includes two stacked skeleton bodies (2), a winding groove (5) on the skeleton body (2), a magnetic core (3) at the upper and lower ends of the skeleton body (2), and PIN pins (6) bent along one side of the winding groove (5) on both sides of the skeleton body (2) to form an L-shaped structure. The two stacked skeleton bodies (2) are a secondary skeleton (15) and a primary skeleton (16). The PIN pins (6) are located on the secondary skeleton (15), and the limiting part (8) is detachably located on the secondary skeleton (15).

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