A low-loss inductor

Abstract

The utility model discloses a low-loss inductor, including a metal core, a flat coil and magnetic glue, wherein an upper limit core is fixedly installed on the upper end of the metal core, a lower limit core is fixedly installed on the lower end of the metal core, a first side electrode and a second side electrode are respectively installed on both sides of the lower limit core, an outer ring of the metal core is provided with a flat coil, both ends of the flat coil are fixedly connected with wiring terminals, and the outer side of the flat coil is coated with magnetic glue. The low-loss inductor is wound with a flat wire to improve the occupancy rate, and at the same time, the contact area of ​​the side electrode is effectively increased by obliquely pulling the side flat wire to reduce the DCR, thereby obtaining a higher saturation current and temperature rise current.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, in particular to a low-loss inductor. Background Art

[0002] Inductor, also known as inductor, refers to a component that can convert electrical energy into magnetic energy and store it. The structure of an inductor is similar to that of a transformer, but it has only one winding. An inductor has a certain inductance, and it only hinders the change of current. If there is no current passing through the inductor, it will try to hinder the current from flowing through it when the circuit is connected; if there is current passing through the inductor, it will try to maintain the current unchanged when the circuit is disconnected. Inductors are also called chokes, reactors, and dynamic reactors. However, existing inductors still have some defects during use;

[0003] The current inductor winding coils are all made of round coils, which have large losses. The losses are mainly composed of core loss and copper wire loss.

[0004] Copper loss is mainly composed of skin effect and DC resistance (DCR). DC resistance (DCR) is mainly composed of the contact area, length and resistivity of the copper wire.

[0005] DCR=ρ·L / S

[0006] ρ is the resistivity; L is the line length; S is the line cross-sectional area;

[0007] The round wire has a high occupancy rate in the magnetic core, a small contact area with the side electrodes, and a large loss.

[0008] So we propose a low-loss inductor to solve the problems mentioned above. Utility Model Content

[0009] The utility model aims to provide a low-loss inductor to solve the problem of high loss caused by high area ratio of circular coil winding proposed in the background art.

[0010] To achieve the above object, the utility model provides the following technical solution: a low-loss inductor, comprising a metal core, a flat coil and magnetic glue,

[0011] An upper limit magnetic core is fixedly installed on the upper end of the metal magnetic core, and a lower limit magnetic core is fixedly installed on the lower end of the metal magnetic core;

[0012] A first side electrode and a second side electrode are respectively installed on both sides of the lower limit magnetic core;

[0013] The outer ring of the metal magnetic core is provided with a flat coil, and both ends of the flat coil are fixedly connected with wiring terminals;

[0014] The outer side of the flat coil is coated with magnetic glue.

[0015] Preferably, the metal magnetic core is arranged in a cylindrical structure.

[0016] The above structural design enables the flat coil to be evenly wound on the outer ring of the metal core, which is beneficial to increase the occupancy rate of the flat coil after winding and improves the winding effect of the metal core on the flat coil.

[0017] Preferably, the upper limit magnetic core and the lower limit magnetic core are symmetrically distributed around the center of the metal magnetic core, and the metal magnetic core, the upper limit magnetic core and the lower limit magnetic core are arranged in an integrated structure, and the metal magnetic core, the upper limit magnetic core and the lower limit magnetic core are arranged in an I-shaped structure.

[0018] The above-mentioned structural design facilitates the I-shaped structure composed of the metal core, the upper limit core and the lower limit core to limit the wound flat coil, which can effectively prevent the flat coil from falling off and loosening after winding, thereby improving the compactness of the structure of the low-loss inductor.

[0019] Preferably, the first side electrode and the second side electrode are symmetrically distributed about the center line of the lower limit magnetic core, and the first side electrode and the second side electrode are designed in a right-angle structure.

[0020] The above-mentioned structural design facilitates the welding connection between the two ends of the flat coil and the corresponding first side electrode and the second side electrode through the wiring terminals, thereby improving the stability of the connection between the flat coil and the first side electrode and the second side electrode, and at the same time helps to increase the contact area between the flat coil and the first side electrode and the second side electrode to reduce losses.

[0021] Preferably, the flat coil is wound and distributed on the outer ring of the metal magnetic core, and the cross-section of the flat coil is arranged in a rectangular structure, and the occupancy rate of the flat coil after winding is 96%.

[0022] The above structural design facilitates the rectangular structure of the flat coil to improve compactness after winding, which is beneficial to effectively improve the occupancy rate of the flat coil after winding, thereby improving the low-loss effect of the inductor.

[0023] Preferably, the magnetic glue forms a wrapping protective structure after solidifying the outer ring of the flat coil.

[0024] The above structural design makes it easy for the magnetic glue to not only fix and position the wound flat coil after curing, but also wrap and protect the flat coil, thereby improving the structural compactness and protection effect of the low-loss inductor.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The low-loss inductor is wound with flat wire to increase the footprint. At the same time, the side flat wire is wound obliquely to effectively increase the contact area of ​​the side electrodes and reduce DCR, thereby obtaining a higher saturation current and temperature rise current.

[0027] Saturation current: refers to the decrease in inductance when DC current is continuously flowing;

[0028] Temperature rise current: refers to the temperature rise of the surface of the inductor when the DC current is continuously passed;

[0029] DCR (Direct Current Resistance): DCR refers to the total DC resistance of the enameled wire used between the electrodes of the product. In the design of the inductor, it is required to make the DC resistance as small as possible. For power inductors, the smaller the DCR, the better, which is beneficial to reducing line losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a side view of the structure of the utility model;

[0031] Figure 2 This is a schematic diagram of the exploded structure of the upper limit magnetic core, the lower limit magnetic core and the flat coil of the utility model;

[0032] Figure 3 It is a schematic diagram of the side section structure of the utility model.

[0033] In the figure: 1. Metal core; 2. Lower limit core; 3. Upper limit core; 4. First side electrode; 5. Second side electrode; 6. Flat coil; 7. Terminal block; 8. Magnetic glue. DETAILED DESCRIPTION

[0034] 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 in 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.

[0035] See also Figure 1-3The utility model provides a technical solution: a low-loss inductor, including a metal core 1, a flat coil 6 and a magnetic glue 8, an upper limit core 3 is fixedly installed on the upper end of the metal core 1, the metal core 1 is arranged in a cylindrical structure, and a lower limit core 2 is fixedly installed on the lower end of the metal core 1, the upper limit core 3 and the lower limit core 2 are symmetrically distributed around the center of the metal core 1, and the metal core 1, the upper limit core 3 and the lower limit core 2 are arranged in an integrated structure, and the metal core 1, the upper limit core 3 and the lower limit core 2 are arranged in an I-shaped structure. The design of the above structure enables the cylindrical setting of the metal core 1 to fit tightly with the flat coil 6 after winding, thereby facilitating the matching connection between the metal core 1 and the flat coil 6, and the integrated setting of the upper limit core 3, the lower limit core 2 and the metal core 1 can effectively limit the flat coil 6 after winding, and can prevent the flat coil 6 from deviating during the winding process, thereby improving the stability of the flat coil 6 after winding.

[0036] Specific as Figure 1-3 As shown, the first side electrode 4 and the second side electrode 5 are respectively installed on both sides of the lower limit magnetic core 2, and the first side electrode 4 and the second side electrode 5 are symmetrically distributed about the center line of the lower limit magnetic core 2, and the first side electrode 4 and the second side electrode 5 are designed in a right-angle structure, and the two ends of the flat coil 6 are fixedly connected with the terminal 7. The design of the above structure enables the wound flat coil 6 to be welded and connected to the first side electrode 4 and the second side electrode 5 through the terminal 7, thereby enhancing the large-area connection between the flat coil 6 and the first side electrode 4 and the second side electrode 5, which is beneficial to reduce losses.

[0037] Specific as Figure 1-3 As shown, the outer ring of the metal core 1 is provided with a flat coil 6, which is wound and distributed on the outer ring of the metal core 1, and the cross-section of the flat coil 6 is arranged in a rectangular structure, and the occupancy rate of the flat coil 6 after winding is 96%, and the outer side of the flat coil 6 is coated with magnetic glue 8, and the magnetic glue 8 forms a wrapping protective structure after the outer ring of the flat coil 6 is cured. The design of the above structure enables the rectangular setting of the flat coil 6 to be wound at a high occupancy rate on the outer ring of the metal core 1, thereby improving the winding occupancy rate of the flat coil 6 to achieve the effect of reducing losses, and the magnetic glue 8 can stably position and fix the wound flat coil 6 after curing, and can also form a protective layer to effectively protect the flat coil 6.

[0038] Working principle: When using this low-loss inductor, first Figure 1-3As shown, first, the upper limit magnetic core 3 and the lower limit magnetic core 2 are fixedly connected to the two ends of the metal magnetic core 1 respectively, so that the three form an integrated structure, and then the flat coil 6 is evenly layered and wound on the metal magnetic core 1. During the winding process of the flat coil 6, the upper limit magnetic core 3 and the lower limit magnetic core 2 at both ends of the metal magnetic core 1 can limit the two ends of the wound flat coil 6 to prevent the flat coil 6 from being wound beyond the maximum contact area of ​​the metal magnetic core 1, thereby improving the winding occupancy rate of the flat coil 6 to achieve the effect of reducing the loss. Then, when the winding of the flat coil 6 is completed, The connecting terminals 7 are welded and installed at both ends, and the inner sides of the connecting terminals 7 are correspondingly welded to the first side electrodes 4 and the second side electrodes 5 on both sides of the lower limit magnetic core 2, so as to increase the contact area between the flat coil 6 and the first side electrodes 4 and the second side electrodes 5, thereby achieving the double effect of reducing losses. Finally, magnetic glue 8 is applied to the outer side of the flat coil 6 and the inner side of the upper limit magnetic core 3 and the lower limit magnetic core 2, so that the magnetic glue 8 can be naturally cured, and after curing, the wound flat coil 6 is positioned, fixed and wrapped for protection, thereby completing the production process of the low-loss inductor.

[0039] Thereby completing a series of tasks, the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-loss inductor, comprising a metal magnetic core (1), a flat coil (6) and magnetic glue (8), characterized in that: An upper limit magnetic core (3) is fixedly mounted on the upper end of the metal magnetic core (1), and a lower limit magnetic core (2) is fixedly mounted on the lower end of the metal magnetic core (1); A first side electrode (4) and a second side electrode (5) are respectively mounted on both sides of the lower limit magnetic core (2); The outer ring of the metal magnetic core (1) is provided with a flat coil (6), and both ends of the flat coil (6) are fixedly connected with connection terminals (7); The outer side of the flat coil (6) is coated with magnetic glue (8).

2. A low-loss inductor according to claim 1, characterized in that: The metal magnetic core (1) is arranged in a cylindrical structure.

3. A low-loss inductor according to claim 1, characterized in that: The upper limit magnetic core (3) and the lower limit magnetic core (2) are symmetrically distributed around the center of the metal magnetic core (1), and the metal magnetic core (1), the upper limit magnetic core (3) and the lower limit magnetic core (2) are arranged in an integrated structure, and the metal magnetic core (1), the upper limit magnetic core (3) and the lower limit magnetic core (2) are arranged in an I-shaped structure.

4. A low-loss inductor according to claim 1, characterized in that: The first side electrode (4) and the second side electrode (5) are symmetrically distributed about the center line of the lower limit magnetic core (2), and the first side electrode (4) and the second side electrode (5) are designed in a right-angle structure.

5. The low-loss inductor according to claim 1, characterized in that: The flat coil (6) is wound and distributed on the outer ring of the metal magnetic core (1), and the cross section of the flat coil (6) is arranged in a rectangular structure, and the area occupancy of the flat coil (6) after winding is 96%.

6. A low-loss inductor according to claim 1, characterized in that: The magnetic glue (8) forms a wrapping protection structure after solidifying on the outer ring of the flat coil (6).

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