CN214956369U - Coil component and inductor - Google Patents
Coil component and inductor Download PDFInfo
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- CN214956369U CN214956369U CN202121658162.6U CN202121658162U CN214956369U CN 214956369 U CN214956369 U CN 214956369U CN 202121658162 U CN202121658162 U CN 202121658162U CN 214956369 U CN214956369 U CN 214956369U
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Abstract
The utility model discloses a coil portion article and inductor relates to electromagnetic element technical field, the utility model discloses a coil portion article, including both ends opening and inside hollow skeleton, insert two magnetic cores of locating in the skeleton and around the coil of locating the skeleton periphery by the both ends opening respectively, leave between the terminal surface that two magnetic cores are relative and be equipped with the magnetic gap, magnetic core terminal surface center indent to the center interval that makes the magnetic gap is greater than the marginal interval. The utility model provides a coil part article can reduce the alternating current resistance under the high frequency to reduce loss and device temperature and can bear great bias current or impulse current.
Description
Technical Field
The utility model relates to an electromagnetic element technical field particularly, relates to a coil portion article and inductor.
Background
An inductor is a component that can convert electrical energy into magnetic energy for storage. The inductor is similar in structure to a transformer, but has only one winding. The inductor has an inductance that only impedes the change in current. If the inductor is in a state where no current is passing, it will try to block the current flow when the circuit is on; if the inductor is in a current passing state, the inductor will try to keep the current unchanged when the circuit is opened. Inductors are also known as chokes, reactors, dynamic reactors. As one of the commonly used electronic components, inductors are widely used in various electronic circuits, and are indispensable components for realizing functions such as energy storage, filtering, and tuning.
With the rapid development of microelectronic technology and semiconductor device technology, the performance of power elements is required to be improved continuously, the high-frequency direction is developed continuously, and accordingly parasitic parameters such as inductance have side effects on circuits in high-frequency occasions.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coil part article and inductor can reduce the alternating current resistance under the high frequency to reduce loss and device temperature and can bear great bias current or impulse current.
The embodiment of the utility model is realized like this:
the utility model provides a coil part article, includes both ends opening and inside hollow skeleton, inserts two magnetic cores of locating in the skeleton and around the coil of locating the skeleton periphery by both ends opening respectively, leaves between the relative terminal surface of two magnetic cores and is equipped with the magnetic gap, and the magnetic core terminal surface center indent to the centre interval that makes the magnetic gap is greater than marginal interval.
Optionally, as an implementable manner, the end surfaces of the two magnetic cores are both concave in the center.
Optionally, as an implementable manner, the center of the end surface of the magnetic core is concave inwards to form a spherical surface.
Optionally, as an implementable manner, the end surface of the magnetic core is recessed along a central line to form a cylindrical surface, and the central line is perpendicular to the magnetic core.
Optionally, as an implementable manner, the end surfaces of the two magnetic cores are cylindrical surfaces, and the concave folding directions of the two cylindrical surfaces are opposite.
Optionally, as an implementable mode, an insulating tape is disposed at a position, corresponding to the magnetic gap, of the outer side of the framework, or a boss is disposed at a position, corresponding to the side gap, of the outer side of the framework.
Optionally, as an implementable manner, the width of the insulating tape is greater than or equal to the edge spacing.
Optionally, as an implementable manner, the coil is a multi-strand wire, and the diameter of a single wire of the multi-strand wire is between 0.03mm and 1.0 mm.
Optionally, as an implementable manner, at least at the minimum distance in the magnetic gap, a magnetic substance is filled, and the magnetic substance is magnetic particles or magnetic glue.
An inductor comprises a partition plate, a top cover and the coil part, wherein a framework comprises pins arranged at two ends of the coil part, the pins are open, each side is used for filling gaps of side columns of a magnetic core, and the top cover is arranged on one side, far away from the pins, of the framework.
The utility model discloses beneficial effect includes:
the utility model provides a pair of coil part article, including both ends opening and inside hollow skeleton, insert two magnetic cores of locating in the skeleton and around the coil of locating the skeleton periphery by the both ends opening respectively, leave between two terminal surfaces that the magnetic core is relative and be equipped with the magnetic gap, magnetic core terminal surface center indent to make the interal distance in magnetic gap be greater than marginal interval, thereby reduce the magnetic leakage that the magnetic edge produced because marginal effect, thereby reduce the wire that the magnetic leakage passed the edge and be located the magnetic leakage magnetic field and produce alternating current resistance, reduce the consumption. The utility model discloses a coil portion article can reduce the alternating current resistance under the high frequency to reduce loss and device temperature and can bear great bias current or impulse current.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a magnetic gap leakage structure due to edge effect in the prior art;
FIG. 2 is a schematic structural view of a frame according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a magnetic core according to an embodiment of the present invention;
fig. 4 is another schematic structural diagram of a magnetic core according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a coil component provided with an insulating tape according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a coil component provided with a boss according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a coil component with a magnetic substance disposed at a minimum distance between magnetic gaps according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a coil component with a magnetic gap provided with a magnetic substance according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an inductor according to an embodiment of the present invention.
Icon: 110-a magnetic core; 120-magnetic gap; 130-a backbone; 131-a pin; 140-an opening; 150-a coil; 160-insulating tape; 170-boss; 180-a magnetic substance; 190-a top cover; 191-partition plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "vertical", "horizontal", "inside", "outside", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which the products of the present invention are conventionally placed when in use, and are only for convenience of description and simplification of the description, but 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
With the development of high frequency in microelectronic and semiconductor technologies, components are required to operate at higher frequency, and due to the increase of frequency, electromagnetic induction of electromagnetic components may have some effects, such as leakage caused by edge effect, as shown in fig. 1, skin effect of wires may cause self-built electric field inside the wires, so that ac resistance of the wires is increased, and loss is caused.
The utility model provides a coil part article, as shown in fig. 2, fig. 3, including both ends opening 140 and inside hollow skeleton 130, insert two magnetic cores 110 of locating in skeleton 130 and around the coil 150 of locating the skeleton 130 periphery by both ends opening 140 respectively, leave between the terminal surface that two magnetic cores 110 are relative and be equipped with magnetic gap 120, magnetic core 110 terminal surface center indent to the centre-to-centre spacing that makes magnetic gap 120 is greater than the marginal interval.
In practical use, the magnetic core 110 of fig. 3 is inserted into the framework 130 through the openings 140 at the two ends of the framework 130 of fig. 2, and the magnetic core 110 and the framework 130 are divided into two figures in order to show the structural features of the magnetic core 110 more clearly.
The magnetic core 110 of the present invention is an E-E type magnetic core or an E-FD type magnetic core 110, and the E type magnetic core has a center pillar and side pillars respectively located at both sides of the center pillar, and a magnetic arm connecting the center pillar and the side pillars, like E. The utility model discloses practical two E type magnetic cores 110 constitute E-E type magnetic core 110, two magnetic core 110's center pillar are inserted respectively by the opening 140 at skeleton 130 both ends and are established in the skeleton 130, and when the center pillar inserted skeleton 130, both sides post was located the outside of the relative both sides face of skeleton 130, and simultaneously, the magnetic arm can be held the contact with the opening 140 of skeleton 130. The E-shaped magnetic core 110 has the advantages of large lead space and convenient winding and wiring, and the E-E shaped magnetic core 110 has the characteristics of high power, high saturation, low impedance and small volume. The E-FD magnetic core 110 has the advantages of low thermal resistance, low attenuation, high power, wide operating frequency, and the like. And the finished product has light weight, reasonable structure and easy surface mounting. The utility model discloses a MnZn ferrite is preferred to the material of magnetic core 110. It should be noted that the magnetic core 110 of the present invention is characterized by the end surface of the center pillar in the magnetic core 110. The side column is mainly used for being matched with the middle column to form a magnetic circuit.
The magnetic gap 120 is a gap left between two opposite E-E type magnetic center posts, and although the magnetic gap 120 is likely to generate a magnetic leakage effect at high frequency, if there is no magnetic gap 120, a magnetic saturation phenomenon is likely to occur when a large current flows through the magnetic gap, after the magnetic gap 120 is saturated, the increase of current does not cause the increase of magnetic field strength, and the magnetic field strength cannot be effectively controlled, and the increased current may cause serious consequences to damage components, so the magnetic gap 120 is left after the two opposite E-E type magnetic center posts are arranged. Illustratively, the magnetic gap 120 has an edge spacing of 2mm to 3 mm.
It should be noted that, for the inductor, a large current needs to be borne, the operating frequency of the normal inductance is about 100KHZ to 300KHZ, and the operating frequency of the inductor has no influence on the resistance of the wire, namely, the direct current resistance. However, at high frequencies, such as over 500KHZ, ac resistance at high frequencies needs to be considered, that is, the present invention is an improvement to the coil 150 with operating frequencies over 500 KHZ.
The utility model provides a pair of coil 150 article, including both ends opening 140 and inside hollow skeleton 130, insert two magnetic cores 110 of locating in skeleton 130 and around the coil 150 of locating skeleton 130 periphery by both ends opening 140 respectively, it is equipped with magnetic gap 120 to leave between the terminal surface that two magnetic cores 110 are relative, the indent in magnetic core 110 terminal surface center, so that magnetic gap 120's center interval is greater than the edge interval, thereby reduce the magnetic leakage that the magnetic edge produced because the edge effect, thereby reduce the wire of magnetic edge and be located the magnetic leakage magnetic field and produce alternating current resistance, reduce the consumption. Therefore, the utility model discloses a coil 150 article can reduce the alternating current resistance under the high frequency to reduce loss and device temperature and can bear great bias current or impulse current.
Alternatively, as shown in fig. 3, the end surfaces of both magnetic cores 110 are concave in center.
When the coil 150 works, the lead of the coil 150 is electrified to generate a magnetic field in the magnetic core 110, and the magnetic spacing is reserved at the centers of the two opposite magnetic cores 110, so that the magnetic leakage is generated at the edge of the magnetic spacing, the end surface is concave inwards, and the concave arc surface has a certain convergence effect on the magnetic circuit, thereby reducing the magnetic leakage. The end faces of the two magnetic cores 110 are located in the magnetic circuit, one magnetic end face and one magnetic end face are arranged, the end faces of the two magnetic cores 110 are recessed in the center to form a cylindrical surface, the magnetic end faces have a certain convergence effect on the magnetic circuit, and the magnetic end faces can also have a certain convergence effect on the magnetic circuit, so that magnetic leakage is reduced. Therefore, the alternating current resistance generated when the lead at the magnetic edge is positioned in the leakage magnetic field is reduced, and the power consumption is reduced.
In an implementation manner of the present invention, as shown in fig. 4, the end surface of the magnetic core 110 is concave and spherical.
The spherical surface is a curved surface which is symmetrical in all directions, and when the magnetic circuit is converged, the convergence degree of the magnetic circuit on the same circumference is the same, so that the magnetic circuit is more uniform. And the concave part of the spherical surface is easier to process in the processing process of the magnetic core 110.
Alternatively, as shown in fig. 4, the end surface of the magnetic core 110 is concave along the center line to form a cylindrical surface, and the center line is perpendicular to the magnetic core 110.
The extension surface of the magnetic core 110 is the plane of the center post and the side posts, and is perpendicular to the center line of the end surface of the magnetic core 110 of the plane of the center post and the side posts, when the end surface is concave inwards along the center line, the cylindrical surface acts on the convergence of the magnetic circuit, and the magnetic leakage phenomenon is reduced. Therefore, when high frequency is reduced, alternating current resistance generated when the lead at the magnetic edge is positioned in a leakage magnetic field is reduced, and power consumption is reduced.
In an implementation manner of the present invention, as shown in fig. 4, the end surfaces of the two magnetic cores 110 are cylindrical surfaces, and the concave folding directions of the two cylindrical surfaces are opposite.
It should be noted that the opposite direction of the concave folding means concave along the center line. And the two end faces are opposed, so that they exhibit opposite directions.
When the coil part works, the conducting wire of the coil 150 is electrified to generate a magnetic field in the magnetic core 110, and the magnetic space is reserved at the center of the two opposite magnetic cores 110, so that the magnetic leakage is generated at the edge of the magnetic space, the center of the end surface is concave inwards, and the concave cylindrical surface has a certain convergence effect on the magnetic circuit, thereby reducing the magnetic leakage. The end faces of the two magnetic cores 110 are located in the magnetic circuit, one magnetic end face and one magnetic end face are arranged, the end faces of the two magnetic cores 110 are recessed in the center to form a cylindrical surface, the magnetic end faces have a certain convergence effect on the magnetic circuit, and the magnetic end faces can also have a certain convergence effect on the magnetic circuit, so that magnetic leakage is reduced. Therefore, the alternating current resistance generated when the lead at the magnetic edge is positioned in the leakage magnetic field is reduced, and the power consumption is reduced.
Optionally, as shown in fig. 5, an insulating tape 160 is disposed outside the framework 130 corresponding to the magnetic gap 120. And the width of the insulating tape 160 is equal to or greater than the edge spacing.
The insulating tape 160 is arranged at the corresponding magnetic gap 120 outside the framework 130, when the coil 150 is wound, the first layer of coil 150 close to the framework 130 bypasses the insulating tape 160, so that the number of wires in a leakage magnetic field can be reduced, the alternating current flowing in the leakage magnetic field is reduced, the increase of the alternating current resistance caused by the skin effect is reduced, and the loss is reduced. Those skilled in the art should know that the magnetic field is fan-shaped at the magnet outgoing surface, that is, the magnetic leakage magnetic field is strongest at the edge of the magnetic gap 120, the utility model discloses set up the insulating tape 160 in the outside of the skeleton 130 that the magnetic gap 120 corresponds, that is, the magnetic gap 120 lacks one deck wire, does not have alternating current to pass through in the strongest place of magnetic leakage magnetic field, has reduced most alternating current resistance loss.
Optionally, as shown in fig. 6, a boss 170 is disposed outside the bobbin 130 corresponding to the magnetic gap 120.
The boss 170 is arranged at the corresponding magnetic gap 120 outside the framework 130, and when the coil 150 is wound, the boss 170 is skipped, so that no conductor is positioned in a leakage magnetic field, that is, no alternating current passes through the leakage magnetic field, and the problem of increase of alternating current resistance caused by skin effect is avoided. Here, the boss 170 may be integrally formed with the frame 130 as the muscle-building body 130 of the frame 130, or the boss 170 may be connected to the frame 130. The boss 170 is arranged at the position corresponding to the magnetic gap 120 outside the framework 130, so that the alternating current can be prevented from being positioned in a leakage magnetic field, the increase of the alternating current resistance is avoided, and the loss is reduced. If the coil 150 is wound on the boss 170, the leakage flux is the largest at the boss 170, and the coil wound on the boss 170 is in the leakage flux region with smaller magnetic density, which also reduces most of the ac resistance and reduces the loss.
In an implementation of the present invention, the coil 150 is a multi-strand wire, and the diameter of the single conductor of the multi-strand wire is between 0.03mm and 1.0 mm.
The wires are usually operated under an alternating magnetic field or conduct an alternating current and sometimes carry a lot of higher harmonics. In these cases, the wire is subject to the effects of eddy current effect, skin effect, etc., and thus the wire will inevitably generate ac electromagnetic loss, which is greater when the alternating frequency of the magnetic field and current is higher. To solve this problem, reducing the cross-sectional area of the wire is the most effective way to reduce the high-frequency loss. The utility model discloses a many mutual insulation's wire parallel connection is used, under same conductive sectional area, reduces the sectional area of single wire, loss that can effectual reduction high frequency magnetic field or electric current and higher harmonic arouse the wire. The smaller the cross-sectional area of a single wire, the lower its losses.
The formula for the penetration depth of the skin effect is:
ω＝2πf (2)
where Δ is the penetration depth, ω is the angular frequency, f is the frequency, μ is the magnetic permeability, and γ is the electrical conductivity.
When the wire is a copper wire, γ is 5.8 × 106(S/m), relative permeability μ of copperrSince 1, μ of copper is the vacuum permeability μ0＝4π*10-7H/m. The penetration depth of the copper wire when the working frequency of 500KHz is calculated to be 0.09mm, namely the diameter of a single wire is less than 0.18mm, for example, the utility model discloses select single wire of 0.1mm to constitute stranded wire.
It should be noted that the utility model discloses the diameter of the single wire of injecing is the copper conductor and is injecing of making under 500 KHz's operating frequency, that is to say, uses the wire of other materials, and operating frequency is when being greater than 500KHz, and the diameter of single wire can calculate according to the skin degree of depth of skin effect. The utility model discloses do not do specifically and restrict.
Optionally, at least at the minimum distance position of the magnetic gap 120, the magnetic substance 180 is filled, and the magnetic substance 180 is magnetic particles or magnetic glue.
As shown in fig. 7, the magnetic substance 180 is filled in the minimum pitch position of the magnetic gap 120, and the leakage flux at the pitch edge can be effectively reduced, so that the coil 150 located in the leakage magnetic field is reduced, the ac resistance at high frequency is reduced, and the loss is reduced. Of course, as shown in fig. 8, the magnetic substance 180 is filled in the entire magnetic gap 120, and the effect of filling the magnetic substance 180 in the minimum position of the magnetic gap 120 can be achieved. As shown in Table 1, the electrical resistance is significantly reduced after the glue is filled in the magnetic gap 120 when other conditions are the same.
TABLE 1
Where φ represents a diameter, P represents a number of strands of coil 150, Ts represents a number of turns of coil 150 about former 130, DCR represents a DC resistance, Rs @500KHz represents an electrical impedance operating at a frequency of 500KHz, and L @500kHz represents an inductance operating at a frequency of 500 KHz. The electric impedance is composed of magnetic core loss, alternating current resistance and direct current resistance, and the direct current resistance is kept unchanged.
The magnetic substance 180 is magnetic particles or magnetic glue, the magnetic particles and the magnetic glue have the advantage of easy filling, and the magnetic particles can be fixed by selecting a substance with certain viscosity. The morphology of the magnetic particles is arbitrary and can be adjusted in real time according to the shape of the magnetic gap 120. Of course, the magnetic block can be used for filling, as long as the effect of preventing the edge magnetic leakage can be achieved. When the magnetic substance 180 is magnetic glue, as shown in table 1, the ac resistance of the inductor can be effectively reduced when the inductor operates at high frequency, and the loss can be reduced.
The embodiment of the utility model provides a still disclose an inductor, as shown in FIG. 9, including baffle 191 and top cap 190 to and coil 150 article as above the book. The frame 130 includes pins 131 arranged at the openings 140 at both ends, the partition 191 is used for filling the gap between the side columns of the magnetic core 110, and the top cover 190 covers the side of the frame 130 far away from the pins 131. The inductor comprises the same structure and benefits as the coil 150 component of the previous embodiment. The structure and advantages of the coil 150 have been described in detail in the foregoing embodiments, and are not repeated herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a coil part article, its characterized in that includes both ends opening and inside hollow skeleton, inserts respectively by both ends opening and locates two magnetic cores in the skeleton and around locating the coil of skeleton periphery, two leave between the relative terminal surface of magnetic core and be equipped with the magnetic gap, magnetic core terminal surface center indent, so that the centre spacing in magnetic gap is greater than the marginal interval.
2. The coil component as claimed in claim 1, wherein the end faces of the two magnetic cores are both concave in center.
3. The coil component as claimed in claim 1, wherein the center of the end surface of the core is concave and spherical.
4. The coil component as claimed in claim 1, wherein the end surface of the magnetic core is concave and cylindrical along a center line, and the center line is perpendicular to the magnetic core.
5. The coil component as claimed in claim 1, wherein the end surfaces of the two magnetic cores are cylindrical surfaces, and the concave folding directions of the two cylindrical surfaces are opposite.
6. A coil component according to any one of claims 1 to 5, wherein an insulating tape or a boss is provided on the outer side of the bobbin corresponding to the magnetic gap.
7. The coiled component of claim 6, wherein the insulating tape has a width equal to or greater than the edge spacing.
8. A coil component according to any one of claims 1 to 5, wherein the coil is a multi-stranded wire, the diameter of the individual conductors of which is between 0.03mm and 1.0 mm.
9. The coil component as claimed in claim 5, wherein at least a minimum distance within the magnetic gap is filled with a magnetic substance, the magnetic substance being magnetic particles or magnetic glue.
10. An inductor, comprising a partition and a top cover, and the coil component as claimed in any one of claims 1 to 9, wherein the bobbin comprises pins arranged and disposed at both ends of the bobbin, the partition is used for filling gaps of the side pillars of the magnetic core, and the top cover is disposed on a side of the bobbin away from the pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121658162.6U CN214956369U (en) | 2021-07-20 | 2021-07-20 | Coil component and inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121658162.6U CN214956369U (en) | 2021-07-20 | 2021-07-20 | Coil component and inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214956369U true CN214956369U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121658162.6U Active CN214956369U (en) | 2021-07-20 | 2021-07-20 | Coil component and inductor |
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|---|---|
| CN (1) | CN214956369U (en) |
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2021
- 2021-07-20 CN CN202121658162.6U patent/CN214956369U/en active Active
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