Novel EE-type patch mutual inductor

Abstract

The utility model discloses a novel EE type paster mutual inductor, which relates to the mutual inductor technology field, and comprises a skeleton, two magnetic cores, a coil winding and a copper sheet, the skeleton comprises a winding reel body with a hollow through hole, two protection plates and two fixing blocks, one side of each fixing block is provided with a pin needle, and the coil winding is wound on the winding reel body; the copper sheet comprises a top sheet, side sheets at the two side ends of the top sheet and copper sheet pins at the lower ends of the two side sheets; the two magnetic cores are of an E-shaped structure, and the winding reel body and the copper sheets are surrounded by the side columns of the two magnetic cores. The copper sheet further comprises buckling sheets with the top sheets facing the two sides of the protection plates, clamping block parts are arranged on the opposite sides of the upper ends of the two protection plates, arc-shaped clamping grooves formed by the buckling sheets abut against the clamping block parts of the arc-shaped structures in a matched mode, the copper sheet is fixed to the framework, dispensing fixing is not needed after the mutual inductor is assembled, the assembling procedure is reduced, and the assembling efficiency is improved. The assembling production efficiency is improved, and the two magnetic cores are fixed through the fixing adhesive tape piece so that assembling can be completed.

Description

Technical Field

[0001] The utility model relates to the technical field of mutual inductors, in particular to a novel EE type patch mutual inductor. Background Art

[0002] With the development and progress of electronic technology, circuit integration is getting higher and higher, and chip mutual inductors have come into being. They can meet the needs of miniaturization of modern circuits and provide a more convenient installation method. Therefore, they are widely used in various electronic devices, such as consumer electronics, industrial control equipment, automotive electronic systems and other fields.

[0003] The structure is as shown in the Chinese patent "A chip mutual inductor that is easy to install and its production method" with announcement number CN115642013A, which includes a magnetic core, a coil winding, a retaining spring, and a shell. Its characteristics are: the magnetic core is divided into two symmetrical halves, the half is "E"-shaped and the protrusion in the middle is a plug rod, the coil winding is hollow and is sleeved on the plug rod, the two sides of the half are baffles, and there is a gap between the coil winding and the baffle, the retaining spring includes a buckle edge formed by bending, and a "U"-shaped enclosure portion, wherein the retaining spring is glued to the magnetic core, and is surrounded and sleeved on the outer periphery of the magnetic core by the shell to fix the magnetic core, and is cross-fixed with the retaining spring to limit the coil winding.

[0004] Another example is the Chinese patent "Fully Insulated Wire-Type Reinforced Insulation Patch Current Transformer for New Energy Vehicles" with announcement number CN208507448U, which includes a skeleton, a magnetic core, a coil winding and a copper sheet; the coil winding is wound on the skeleton, and one end of the two U-shaped magnetic cores is respectively passed through the two sides of the cavity of the skeleton, and copper sheets are provided below and vertically to wrap the coil winding. The copper sheets on both sides in the vertical direction are provided with copper pins, and the copper pins serve as secondary side outputs. Among them, the function of the copper sheet in the comparative document 2 is to form a creepage distance with the magnetic core in the vertical direction, and then form a creepage distance in the horizontal direction in combination with the magnetic core and the primary side pins, forming a creepage distance in two directions, thereby effectively saving the length of the device, and the retaining spring in the comparative document 1 is similar to the copper sheet structure in the comparative document 2.

[0005] In the above-mentioned comparative documents 1 and 2, the copper sheet (circlip) is generally fixed to the magnetic core and the winding bobbin by glue dripping, which results in the need to use a glue dispenser or manually glue the copper sheet to the magnetic core and the winding bobbin after the assembly of the mutual inductor is completed. Although the problem of fixing the copper sheet to the magnetic core and the winding bobbin is solved to a certain extent, the added assembly process of the mutual inductor affects the assembly production efficiency of the mutual inductor.

[0006] Therefore, it is necessary to propose a new technical solution to solve the above problems. Utility Model Content

[0007] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a novel EE type chip mutual inductor, comprising a skeleton, two magnetic cores, a coil winding, and a copper sheet, wherein the skeleton comprises a winding barrel having a hollow through hole, guard plates on both sides of the winding barrel, and fixed blocks on opposite sides of the two guard plates, wherein a plurality of pins are provided on opposite sides of the two fixed blocks, and the coil winding is wound on the winding barrel;

[0009] The copper sheet includes a top sheet, side sheets wrapped around both sides of the top sheet and extending to the lower end of the winding barrel, and copper sheet pins formed by bending the lower ends of the two side sheets toward opposite sides;

[0010] The two magnetic cores are in an "E"-shaped structure, and the two magnetic cores are inserted into the hollow through-hole of the winding drum body from both sides of the skeleton through the middle column, and the side columns of the two magnetic cores form an enclosure around the winding drum body and the copper sheet;

[0011] The copper sheet also includes snap-on sheets on both sides of the top sheet facing the guard plate, and the opposite sides of the upper ends of the two guard plates have block parts. When the copper sheet is sleeved, the snap-on sheets and the block parts form an abutment fit.

[0012] As a further solution of the present invention: the snap-on piece has elastic bending characteristics, the snap-on piece is bent into an arc shape, and an inner arc-shaped slot is formed, and the clamping block portion has an arc-shaped structure.

[0013] As a further solution of the present invention: a fixing tape is wrapped around the two magnetic cores, and the fixing tape has insulating properties.

[0014] As a further solution of the present invention: the lower side of the copper sheet pin has a convex point formed by a frosting process.

[0015] As a further solution of the present invention: the lower side of the fixing block has a plurality of recesses corresponding to the pins, and the coil winding is led out with wires, which pass through the recesses and are electrically connected to the pins.

[0016] As a further solution of the present invention: the wire is wound around the pin.

[0017] Compared with the prior art, the beneficial effects of the present technical solution are as follows: during assembly, the copper sheet is placed with the top sheet on top and the side sheets on both sides sleeved on the outside of the coil winding on both sides of the coil winding; at the same time, the snap-fit ​​sheets on both sides can be expanded outward and pass over the block portion by generating elastic bending, and elastically recover after passing over the block portion, so that the arc-shaped slot formed by the arc-shaped bending of the snap-fit ​​sheet can abut and cooperate with the arc-shaped block portion, thereby fixing the copper sheet to the frame, eliminating the need for glue fixation after the mutual inductor is assembled, reducing assembly steps, and improving assembly production efficiency;

[0018] After the copper sheet is put on the winding drum body and the coil winding, the middle posts of the two magnetic cores are inserted into the hollow through-holes of the winding drum body from both sides, and the two magnetic cores are aligned oppositely to form a preliminary splicing. Then, the two magnetic cores are wrapped and fixed with fixing tape to fix the two magnetic cores to each other. At the same time, the middle post is used to fix the two magnetic cores to the frame, thereby completing the assembly of the entire mutual inductor.

[0019] When soldering the copper pins to the contact points, the bumps formed after frosting can increase the roughness of the copper pin surface, which helps to improve the bonding force between the solder and the copper pins during soldering, thereby enhancing mechanical fixation and preventing loosening caused by vibration or thermal stress.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the utility model when viewed from above;

[0025] Figure 4 It is a schematic diagram of the plane structure of the utility model;

[0026] Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at center A;

[0027] The corresponding reference numerals in the accompanying drawings are described as follows:

[0028] 1. Frame; 11. Winding drum body; 12. Guard plate; 121. Block portion; 13. Fixing block; 131. Gap groove;

[0029] 2. Magnetic core;

[0030] 3. Coil winding; 31. Wire;

[0031] 4. Copper sheet; 41. Top sheet; 42. Side sheet; 43. Copper sheet pin; 431. Bump; 44. Snap sheet; 441. Arc-shaped slot;

[0032] 5. Pin needle;

[0033] 6. Fix the tape. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1-5 A novel EE-type chip mutual inductor includes a skeleton 1, two magnetic cores 2, a coil winding 3, and a copper sheet 4. The skeleton 1 includes a winding barrel 11 with a hollow through hole, protective plates 12 on both sides of the winding barrel 11, and fixed blocks 13 on opposite sides of the two protective plates 12. A plurality of pins 5 are provided on opposite sides of the two fixed blocks 13. The coil winding 3 is wound on the winding barrel 11.

[0036] The copper sheet 4 includes a top sheet 41, side sheets 42 wrapped around both sides of the top sheet 41 and extending to the lower end of the winding barrel 11, and copper sheet pins 43 formed by bending the lower ends of the two side sheets 42 toward opposite sides.

[0037] The two magnetic cores 2 are in an "E"-shaped structure, and the two magnetic cores 2 are inserted into the hollow through-hole of the winding drum body 11 from both sides of the skeleton 1 through the middle column, and the side columns of the two magnetic cores 2 form a circle around the winding drum body 11 and the copper sheet 4;

[0038] The copper sheet 4 also includes snap-on sheets 44 on both sides of the top sheet 41 facing the guard plate 12, and a block portion 121 is provided on the opposite side of the upper ends of the two guard plates 12. When the copper sheet 4 is sleeved, the snap-on sheets 44 form an abutment fit with the block portion 121. The snap-on sheets 44 have elastic bending properties, are bent in an arc shape, and have an inner arc-shaped slot 441 formed therein, and the block portion 121 has an arc-shaped structure.

[0039] Specifically, during assembly, the copper sheet 4 is placed with the top sheet 41 on top and the side sheets 42 on both sides being sleeved on the outside of the coil winding 3 on both sides of the coil winding 3. At the same time, the snap pieces 44 on both sides press against the block parts 121 at the upper ends of the guard plates 12 on both sides of the winding barrel body 11 from top to bottom, and elastically bend so that the snap pieces 44 can expand outward and pass over the block parts 121, and elastically recover after passing over the block parts 121, so that the arc-shaped slot 441 formed by the arc-shaped bending setting of the snap piece 44 can be abutted and cooperated with the block parts 121 with an arc-shaped structure, thereby fixing the copper sheet 4 to the frame 1, and there is no need to perform glue fixation after completing the assembly of the mutual inductor, thereby reducing the assembly process and improving the assembly production efficiency.

[0040] Preferably, the two magnetic cores 2 are wrapped with a fixing tape 6 , and the fixing tape 6 has insulating properties.

[0041] Specifically, after the copper sheet 4 is put on the winding drum body 11 and the coil winding 3, the middle columns of the two magnetic cores 2 are inserted into the hollow through-holes of the winding drum body 11 from both sides, and the two magnetic cores 2 are aligned oppositely to form a preliminary splicing, and then the two magnetic cores 2 are wrapped and fixed with a fixing tape 6, so as to fix the two magnetic cores 2 to each other. At the same time, the middle column is used to fix the two magnetic cores to the skeleton 1, thereby completing the assembly of the entire mutual inductor. Furthermore, the fixing tape 6 has insulating properties, which allows the fixing tape 6 to ensure insulation performance while wrapping and fixing the two magnetic cores 2.

[0042] Preferably, the lower side of the copper pin 43 has a bump 431 formed by a frosting process.

[0043] Specifically, when the copper sheet pin 43 is welded to the power point, the bump 431 formed after frosting can increase the roughness of the surface of the copper sheet pin 43, which helps to improve the bonding force between the solder and the copper sheet pin 43 during welding, thereby enhancing mechanical fixation and preventing loosening due to vibration or thermal stress.

[0044] Preferably, the lower side of the fixing block 13 has a plurality of recesses 131 corresponding to the pins 5, and the coil winding 3 is led out with a wire 31, which passes through the recesses 131 and is electrically connected to the pins 5;

[0045] The wire 31 is wound around the pin 5 .

[0046] Specifically, when the wire 31 led out of the coil winding 3 is connected to the pin 5, the recess 131 on the lower side of the fixing block 13 is used to better lead the wire out of the frame 1. In addition, the recess 131 provides a storage space for the wire 31, thereby making the lower side of the transformer flat and preventing the lower side of the transformer from being uneven due to the lead-out of the wire 31, thereby preventing the mounting from being unstable.

[0047] At the same time, the wire 31 is wound around the pin 5 to make the connection more stable. The wire 31 and the pin 5 can also be welded after winding to further fix them and avoid looseness causing poor contact.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A new EE type chip mutual inductor, characterized in that: It comprises a skeleton (1), two magnetic cores (2), a coil winding (3) and a copper sheet (4), wherein the skeleton (1) comprises a winding barrel (11) having a hollow through hole, protective plates (12) on both sides of the winding barrel (11) and fixed blocks (13) on opposite sides of the two protective plates (12), and a plurality of pins (5) are provided on opposite sides of the two fixed blocks (13), and the coil winding (3) is wound on the winding barrel (11); The copper sheet (4) comprises a top sheet (41), side sheets (42) wrapped around both sides of the top sheet (41) and extending to the lower end of the winding barrel (11), and copper sheet pins (43) formed by bending the lower ends of the two side sheets (42) toward opposite sides. The two magnetic cores (2) are in an "E"-shaped structure, and the two magnetic cores (2) are respectively inserted into the hollow through-hole of the winding drum body (11) from both sides of the skeleton (1) through the middle column, and the side columns of the two magnetic cores (2) enclose the winding drum body (11) and the copper sheet (4); The copper sheet (4) further comprises snap-fit ​​pieces (44) on both sides of the top sheet (41) facing the guard plate (12), and a snap-fit ​​portion (121) is provided on opposite sides of the upper ends of the two guard plates (12). When the copper sheet (4) is sleeved, the snap-fit ​​pieces (44) and the snap-fit ​​portion (121) form an abutment fit.

2. The novel EE type chip mutual inductor according to claim 1, characterized in that: The snap-on piece (44) has elastic bending characteristics, is curved in an arc shape, and forms an inner arc-shaped slot (441), and the clamping block portion (121) is an arc-shaped structure.

3. The novel EE type chip mutual inductor according to claim 1, characterized in that: The two magnetic cores (2) are wrapped with fixing tape (6), and the fixing tape (6) has insulating properties.

4. The novel EE type chip mutual inductor according to claim 1, characterized in that: The lower side of the copper sheet pin (43) has a convex point (431) formed by a frosting process.

5. The novel EE type chip mutual inductor according to claim 1, characterized in that: The lower side of the fixing block (13) has a plurality of clearance grooves (131) corresponding to the pins (5), and the coil winding (3) is led out with a wire (31), and the wire (31) passes through the clearance grooves (131) and is electrically connected to the pins (5).

6. The novel EE type chip mutual inductor according to claim 5, characterized in that: The wire (31) is wound around the pin (5).

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