Magnetic device capable of preventing magnetic core from cracking

Abstract

The utility model relates to a magnetic device capable of preventing a magnetic core from cracking, and belongs to the technical field of switching power supplies. Comprising a magnetic core, a framework and a coil, and the magnetic core is a synthetic magnetic core formed by cutting and bonding a middle column. And the middle column of the synthetic magnetic core is bonded by epoxy glue. The framework comprises a hollow shaft column, an outgoing line hitching leg area connected with the two ends of the shaft column and retaining walls arranged at the two ends of the shaft column, and the coil is arranged on the periphery of the shaft column in a winding mode. The magnetic device capable of preventing the magnetic core from cracking comprises the framework, the magnetic core and the coil, the cutting surfaces of the magnetic core material are bonded together to synthesize a new magnetic core by bonding the cutting magnetic core with epoxy glue, and when the temperature of the magnetic device rises to cause the expansion of the pouring sealant, the stress generated by the expansion of the pouring sealant is absorbed, so that the magnetic core is prevented from cracking. And the tension applied to the magnetic core and the coil is relieved, so that the magnetic core is effectively prevented from cracking.

Description

Technical Field

[0001] The utility model relates to a magnetic device for preventing a magnetic core from cracking, and belongs to the technical field of switching power supplies. Background Art

[0002] Magnetic components are an indispensable part of switching power supply products, such as LED driver power supplies. Magnetic components generally consist of three parts: a bobbin, a magnetic core, and a coil. To ensure that the switching power supply is waterproof, drop-resistant, and heat-dissipating, potting compound must be filled into the switching power supply housing. This potting compound fills the gaps between the coil, bobbin, and core in the magnetic component. During normal operation of the switching power supply, the internal temperature rises. At the same time, due to the different thermal expansion coefficients of the various parts of the magnetic component, the bobbin, coil, and potting compound squeeze each other after heating, and the degree of squeezing on the magnetic core also varies. This can cause the core to crack, the air gap to increase, and the inductance to change, causing the circuit to malfunction and eventually fail. Therefore, how to prevent the core from cracking becomes a technical problem that those skilled in the art need to solve. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a magnetic device that prevents the magnetic core from cracking, thereby solving the problem of the magnetic core cracking due to thermal expansion.

[0004] The utility model is realized through the following technical solution: a magnetic device for preventing a magnetic core from cracking, comprising a magnetic core, a skeleton and a wire package, wherein the magnetic core is a synthetic magnetic core formed by cutting and bonding a center column.

[0005] The center column of the synthetic magnetic core is bonded by epoxy adhesive.

[0006] The epoxy adhesive used in the center column of the synthetic magnetic core is a cured silicone layer.

[0007] The skeleton includes a hollow shaft column, a wire hanging area connecting the two ends of the shaft column, and a retaining wall arranged at the two ends of the shaft column. The wire is wrapped around the outer periphery of the shaft column.

[0008] The magnetic core comprises a base, a pair of magnetic core end posts arranged perpendicular to the base, and a magnetic core middle post arranged between the pair of magnetic core end posts.

[0009] The magnetic core is relatively arranged at two ends of the frame, and a pair of magnetic core middle columns passing through the shaft column are alternately arranged with a preset gap.

[0010] The magnetic device for preventing magnetic core cracking provided by the utility model comprises a skeleton, a magnetic core and a winding package. The cut magnetic core is bonded with epoxy glue so that the cut surfaces of the magnetic core material are bonded together to form a new magnetic core. When the temperature of the magnetic device rises and the potting glue expands, the stress generated by the expansion of the potting glue is absorbed, and the tension on the magnetic core and the winding package is relieved, thereby effectively preventing the magnetic core from cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] Figure 2 A schematic diagram of a cutting magnetic core according to the present invention;

[0014] Figure 3 A schematic diagram of a magnetic core bonded and synthesized according to the present invention;

[0015] Figure 4 A schematic diagram of the skeleton of the utility model;

[0016] Figure 5 This is a schematic diagram of a magnetic core bonded together in Example 2 of the present utility model;

[0017] Figure 6 This is a schematic diagram of cutting the magnetic core according to Example 2 of the present utility model.

[0018] In the figure: 1. Magnetic core; 2. Skeleton; 3. Wire wrap; 4. Glue point. DETAILED DESCRIPTION

[0019] 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.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0021] like Figures 1 to 4 A magnetic device for preventing a magnetic core from cracking is shown, comprising a magnetic core 1, a skeleton 2 and a coil 3. The magnetic core 1 is a composite magnetic core formed by cutting and bonding center columns.

[0022] The center column of the synthetic magnetic core is bonded by epoxy adhesive.

[0023] The epoxy adhesive used in the center column of the synthetic magnetic core is a cured silicone layer.

[0024] The skeleton 2 includes a hollow shaft column, a wire hanging area connecting the two ends of the shaft column, and a retaining wall arranged at both ends of the shaft column. The wire package 3 is wound around the outer circumference of the shaft column.

[0025] The magnetic core 1 comprises a base, a pair of magnetic core end posts arranged perpendicular to the base, and a magnetic core middle post arranged between the pair of magnetic core end posts.

[0026] The magnetic core 1 is disposed at two opposite ends of the frame 2 , and a pair of magnetic core middle columns passing through the shaft column are alternately arranged with a preset gap. Example

[0027] like Figure 5 and Figure 6 As shown, the center column of the magnetic core 1 is beveled, and the bonding area of ​​the cut surface of the beveled magnetic core is larger after cutting, and the stress at the magnetic core angle is eliminated, so that the utility model provides more buffering and stress elimination for the expansion margin of traditional potting glue.

[0028] In order to prevent the traditional potting compound from expanding due to heat and causing the magnetic core to crack, the utility model uses epoxy glue to bond the cut magnetic core, so that the cut surfaces of the magnetic core material are bonded together to form a new magnetic core. When the magnetic device heats up and causes the potting compound to expand, the stress generated by the expansion of the potting compound is absorbed, thereby increasing the expansion margin of the traditional potting compound and providing a certain stress buffer for the magnetic core, thereby preventing the expanded potting compound from expanding the magnetic core and significantly reducing the cracking of the magnetic core.

[0029] The following describes the cut core setup using a PQ-type magnetic component as an example. The same setup applies to EE-type magnetic components. The PQ-type bobbin magnetic component primarily consists of core 1, which is cut along the center of the center column. After smoothing, the cut surfaces are coated with epoxy glue. Two cut cores are then joined together to form a new composite core. This new composite core, bonded with epoxy glue, eliminates air gaps, ensuring stable inductance.

[0030] Correspondingly, in the application, the wire package 3 is wound along the frame 2, and the outer surface of the wire package is also provided with insulating tape. A pair of new synthetic magnetic cores are installed in the wire package 3 and the frame 2 and fixed with epoxy glue points 4.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetic device for preventing magnetic core cracking, characterized in that: It comprises a magnetic core (1), a frame (2) and a wire package (3), wherein the magnetic core (1) is a composite magnetic core formed by cutting and bonding a center column.

2. A magnetic device for preventing magnetic core cracking according to claim 1, characterized in that: The center column of the synthetic magnetic core is bonded by epoxy adhesive.

3. A magnetic device for preventing magnetic core cracking according to claim 1, characterized in that: The epoxy adhesive used in the center column of the synthetic magnetic core is a cured silicone layer.

4. A magnetic device for preventing magnetic core cracking according to claim 1, characterized in that: The skeleton (2) comprises a hollow shaft column, a wire outlet hanging foot area connecting the two ends of the shaft column, and a retaining wall arranged at the two ends of the shaft column, and the wire package (3) is wound around the outer circumference of the shaft column.

5. A magnetic device for preventing magnetic core cracking according to claim 4, characterized in that: The magnetic core (1) comprises a base, a pair of magnetic core end posts arranged perpendicular to the base, and a magnetic core middle post arranged between the pair of magnetic core end posts.

6. A magnetic device for preventing magnetic core cracking according to claim 5, characterized in that: The magnetic core (1) is arranged at two ends of the frame (2) opposite to each other, and a pair of magnetic core middle columns passing through the shaft column are arranged alternately with a preset gap.

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