Flat coil common mode inductor with novel structure

Abstract

The utility model discloses a flat coil common-mode inductor with a novel structure, which comprises a magnetic core, a lower coil and an upper coil, and is characterized by further comprising a protective frame and a cover plate, the magnetic core is arranged in the protective frame, a pin positioning plate is arranged on the protective frame, and the lower coil and the upper coil are wound by a die and then mounted on the magnetic core. Pins of the upper coil and the lower coil are formed, led out and fixed to the pin positioning plate, inserting blocks are symmetrically and fixedly arranged on the cover plate, inserting grooves allowing the inserting blocks to be inserted are formed in the protection frame, clamping grooves are formed in the side walls of the inserting grooves in a penetrating mode, clamping block grooves are formed in the side walls of the inserting blocks and correspond to the clamping grooves, and clamping blocks used for being clamped into the clamping grooves are arranged in the clamping block grooves. According to the utility model, the coils are wound on a mold and then assembled on the magnetic core, so that a large-range winding space is not needed under the condition of reaching enough power and bearing large current, and therefore, the size of the structure is reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of common mode inductors, in particular to a common mode inductor with a new flat coil structure. Background Art

[0002] Common mode inductors (Common mode Choke), also known as common mode chokes, are usually used to filter common mode electromagnetic interference signals in switching power supplies. In board design, common mode inductors also play the role of EMI filtering, which is used to suppress the outward radiation of electromagnetic waves generated by high-speed signal lines.

[0003] Traditional common-mode inductors are usually U-shaped double-slot structures, E-shaped double-slot structures, and ring structures. These structures are usually used in low-power switching power supply circuits. The required current is often not high and the cost is relatively low. In high-power switching power supply circuits, if this type of structure is continued to be used, more winding space and thicker round enameled wire are often required, which will lead to other problems. After the enameled wire becomes thicker, the support frame must also become larger and thicker to support the wire package. The volume of the entire product also increases, and the cost required is also increased a lot. In addition, the production process becomes more difficult. Utility Model Content

[0004] The utility model aims to provide a flat coil common mode inductor with a new structure to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new structure flat coil common mode inductor, including a magnetic core, a lower coil and an upper coil, and also including a protective frame and a cover plate, the magnetic core is arranged in the protective frame, and a pin positioning plate is provided on the protective frame, the lower coil and the upper coil are installed on the magnetic core after being wound by a mold, the upper coil and the lower coil pins are formed and led out and fixed on the pin positioning plate, the cover plate is symmetrically fixed with plug blocks, the protective frame is provided with a slot for inserting the plug block, the slot side wall is penetrated by a card slot, the plug block side wall and the card slot are correspondingly provided with a card block slot, the card block slot is provided with a card block for inserting into the card slot, and a butt ring that abuts against the cover plate is sleeved on the magnetic core above the upper coil.

[0006] Preferably, the upper coil and the lower coil are made of flat enameled wire, which are wound through a mold, assembled on the magnetic core and fixed by adhesive.

[0007] Preferably, the protective frame, cover plate and retaining ring are made of insulating materials.

[0008] Preferably, a lower positioning block and an upper positioning block are fixedly provided at both ends of the magnetic core, a lower positioning groove for inserting the lower positioning block is provided in the protective frame, and an upper positioning groove for inserting the upper positioning block is provided on the cover plate, and the upper positioning groove and the lower positioning groove are both square grooves and fit tightly with the upper positioning block and the lower positioning block respectively.

[0009] Preferably, a block spring for driving the block to slide is fixedly provided in the block groove, and the block spring is fixedly connected to the block.

[0010] Preferably, the end of the block located outside the block slot and close to the guard frame is an inclined surface, the inner wall of the block slot is symmetrically provided with limiting grooves, and a limiting block fixedly connected to the side wall of the block is slidably arranged in the limiting groove.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: through the arrangement of the protective frame, the cover plate, the plug-in block, the slot, the block slot, the block spring, the block and the slot, the flat coil is more resistant to high temperature than the ordinary round coil, and the flat coil is smaller in size when the same current passes through it. Therefore, when it is necessary to withstand a large current, the flat coil requires less space than the ordinary round coil, and is assembled on the magnetic core after being wound by a mold and fixed by an adhesive, and no winding space is required, thereby reducing the volume of the product and reducing the production cost. The flat coil is wound flat on the mold in an orderly manner, and after the desired number of turns is wound, Make positive and negative coils, shape and lead out the pins, assemble the coils on the magnetic core, fix them with adhesive, fix the pins on the pin positioning plate, align the plug with the slot and insert it. The card block is subjected to the force of the inner wall of the slot to compress the card block spring and slide it into the card block slot until the plug block and the slot are butted. At this time, the cover plate and the end of the frame are butted, the butt ring and the cover plate are butted, and the upper positioning block is inserted into the upper positioning slot. Under the elastic force of the card block spring, the card block is inserted into the card slot to limit the plug block, and the installation of the cover is completed, reducing the space required for the coil and the winding space, thereby reducing the volume of the coil and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 Schematic diagram of the appearance of this embodiment;

[0014] Figure 2 This is a disassembled diagram of the cover plate and the protective frame of this embodiment;

[0015] Figure 3 is a front cross-sectional view of this embodiment;

[0016] Figure 4 It is an enlarged view of point A of this embodiment;

[0017] Figure 5 This is a diagram showing the coil installation completion of this embodiment.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Magnetic core; 2. Lower coil; 3. Upper coil; 4. Guard frame; 5. Pin positioning plate; 6. Pin; 7. Lower positioning groove; 8. Lower positioning block; 9. Retaining ring; 10. Cover plate; 11. Upper positioning groove; 12. Upper positioning block; 13. Slot; 14. Insert block; 15. Block slot; 16. Block spring; 17. Block; 18. Slot; 19. Limiting groove; 20. Limiting block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The utility model provides a technical solution: a new structure flat coil common mode inductor, including a magnetic core 1, a lower coil 2 and an upper coil 3, and also including a protective frame 4 and a cover plate 10. The magnetic core 1 is arranged in the protective frame 4, and a pin positioning plate 5 is provided on the protective frame 4. The lower coil 2 and the upper coil 3 are installed on the magnetic core 1 after being wound by a mold. The pins of the upper coil 3 and the lower coil 2 are formed and led out and fixed on the pin positioning plate 5. An insert block 14 is symmetrically fixed on the cover plate 10. A slot 13 for inserting the insert block 14 is opened on the protective frame 4. A card slot 18 is opened through the side wall of the slot 13. A card block slot 15 is opened on the side wall of the insert block 14 corresponding to the card slot 18. A card block 17 for inserting into the card slot 18 is provided in the card block slot 15. A ring 9 that abuts against the cover plate 10 is provided above the upper coil 3 on the magnetic core 1.

[0022] Specifically, the upper coil 3 and the lower coil 2 are made of flat enameled wire, which are wound through a mold, assembled on the magnetic core 1 and fixed by adhesive. The flat coil is more resistant to high temperature than the ordinary round coil, and the flat coil is smaller in size when the same current passes through it. Therefore, when it needs to withstand a large current, the flat coil requires less space than the ordinary round coil. After being wound through a mold, it is assembled on the magnetic core 1 and fixed by adhesive, and there is no need to provide winding space, thereby reducing the volume of the product and reducing the production cost.

[0023] Specifically, the protective frame 4, the cover plate 10 and the retaining ring 9 are made of insulating materials, which can protect the magnetic core coil while avoiding affecting the use of the inductor.

[0024] Specifically, a lower positioning block 8 and an upper positioning block 12 are fixedly provided at both ends of the magnetic core 1, a lower positioning groove 7 for inserting the lower positioning block 8 is opened in the protective frame 4, and an upper positioning groove 11 for inserting the upper positioning block 12 is opened on the cover plate 10. Both the upper positioning groove 11 and the lower positioning groove 7 are square grooves and fit tightly with the upper positioning block 12 and the lower positioning block 8 respectively. By inserting the lower positioning block 8 into the lower positioning groove 7 and the upper positioning block 12 into the upper positioning groove 11, the magnetic core 1 is stably fixed in the protective frame 4 and will not rotate.

[0025] Specifically, a block spring 16 for driving the block 17 to slide is fixedly provided in the block groove 15, and the block spring 16 is fixedly connected to the block 17. Through the elastic force of the block spring 16, the block 17 is inserted into the slot 18 to limit the insertion block 14, thereby completing the installation of the cover plate 10 and the protective frame 4.

[0026] Specifically, the end of the card block 17 outside the card block slot 15 and the end close to the guard frame 4 is an inclined surface. When installing the cover plate 10, the plug block 14 is aligned with the slot 13 and inserted. The card block 17 is subjected to the force of the inner wall of the slot 13 so that the card block 17 compresses the card block spring 16 and slides into the card block slot 15 until the plug block 14 and the slot 13 are abutted. At this time, the cover plate 10 and the end of the guard frame 4 are abutted, the ring 9 and the cover plate 10 are abutted, and the upper positioning block 12 is inserted into the upper positioning slot 11. Under the elastic force of the card block spring 16, the card block 14 is inserted into the upper positioning slot 11. The block 17 is inserted into the card slot 18 to limit the insertion block 14, and the installation of the cover plate 10 is completed. When disassembling, the card block 17 is pressed through the card slot 18 to make the card block 17 slide into the card block slot 15, and the cover plate 10 and the protective frame 4 can be disassembled. The inner wall of the card block slot 15 is symmetrically provided with a limiting groove 19, and a limiting block 20 fixedly connected to the side wall of the card block 17 is slidably provided in the limiting groove 19. The limiting groove 19 and the limiting block 20 are used to limit the card block 17 to prevent the card block 17 from sliding out of the card block slot 15 too much and interfering with the installation of the cover plate 10.

[0027] A specific application example of this embodiment is:

[0028] When the device is in use, the flat coil is wound on the mold in an orderly manner. After the desired number of turns is reached, two positive and negative coils are produced, the pins are formed and led out, and the coils are assembled on the magnetic core 1, fixed with adhesive, the pins 6 are fixed on the pin positioning plate 5, the retaining ring 9 is sleeved on the magnetic core 1 and located on the upper coil 3, the plug 14 is aligned with the slot 13 and inserted, and the clamping block 17 is subjected to the force of the inner wall of the slot 13 so that the clamping block 17 compresses the clamping block spring 16 and slides into the clamping block groove 15 until the plug 14 and the slot 13 are abutted. At this time, the cover plate 10 and the end of the protective frame 4 are abutted, the retaining ring 9 and the cover plate 10 are abutted, and the upper positioning block 12 is inserted into the upper positioning groove 11. Under the elastic force of the clamping block spring 16, the clamping block 17 is clamped into the clamping groove 18 to limit the plug 14, and the installation of the cover plate 10 is completed, reducing the space required for the coil and the winding space, thereby reducing the volume of the coil and reducing the production cost.

[0029] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the drawings, which are only for the convenience of describing 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 should not be understood as a limitation on the present invention.

[0030] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that modifications may be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new flat coil common mode inductor, comprising a magnetic core (1), a lower coil (2) and an upper coil (3), characterized in that: The invention also comprises a protective frame (4) and a cover plate (10), wherein the magnetic core (1) is arranged in the protective frame (4), a pin positioning plate (5) is arranged on the protective frame (4), the lower coil (2) and the upper coil (3) are mounted on the magnetic core (1) after being wound by a mold, the pins of the upper coil (3) and the lower coil (2) are formed and led out and fixed on the pin positioning plate (5), an insert block (14) is symmetrically fixed on the cover plate (10), a slot (13) for inserting the insert block (14) is provided on the protective frame (4), a clamping groove (18) is provided through the side wall of the slot (13), a clamping block groove (15) is provided on the side wall of the insert block (14) corresponding to the clamping groove (18), a clamping block (17) for clamping into the clamping groove (18) is arranged in the clamping block groove (15), and a retaining ring (9) is provided on the magnetic core (1) above the upper coil (3) and abuts against the cover plate (10).

2. According to claim 1, a novel flat coil common mode inductor is characterized in that: The upper coil (3) and the lower coil (2) are made of flat enameled wire, which are wound by a mold, assembled on the magnetic core (1), and fixed by glue.

3. The novel flat coil common mode inductor according to claim 1 is characterized in that: The protective frame (4), the cover plate (10) and the retaining ring (9) are made of insulating materials.

4. The novel flat coil common mode inductor according to claim 1 is characterized in that: A lower positioning block (8) and an upper positioning block (12) are fixedly provided at both ends of the magnetic core (1), a lower positioning groove (7) for inserting the lower positioning block (8) is provided in the protective frame (4), and an upper positioning groove (11) for inserting the upper positioning block (12) is provided on the cover plate (10), and both the upper positioning groove (11) and the lower positioning groove (7) are square grooves and are respectively tightly fitted with the upper positioning block (12) and the lower positioning block (8).

5. The novel flat coil common mode inductor according to claim 1 is characterized in that: A clamping block spring (16) for driving the clamping block (17) to slide is fixedly disposed in the clamping block groove (15), and the clamping block spring (16) is fixedly connected to the clamping block (17).

6. The novel flat coil common mode inductor according to claim 1 is characterized in that: The end of the clamping block (17) located outside the clamping block slot (15) and close to the guard frame (4) is an inclined surface, and the inner wall of the clamping block slot (15) is symmetrically provided with a limit slot (19), and a limit block (20) fixedly connected to the side wall of the clamping block (17) is slidably provided in the limit slot (19).

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