CN114156041B - Magnetic core structure and magnetic element - Google Patents
Magnetic core structure and magnetic element Download PDFInfo
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- CN114156041B CN114156041B CN202111485042.5A CN202111485042A CN114156041B CN 114156041 B CN114156041 B CN 114156041B CN 202111485042 A CN202111485042 A CN 202111485042A CN 114156041 B CN114156041 B CN 114156041B
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- 230000007704 transition Effects 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
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Abstract
The present invention relates to a magnetic core structure and a magnetic element comprising the same. The magnetic core structure comprises a first magnetic core cover plate, a second magnetic core cover plate, at least two winding posts and one side post, wherein the winding posts and the side post are positioned between the first magnetic core cover plate and the second magnetic core cover plate, and the side post comprises a first side edge part, a second side edge part and a third side edge part connected between the first side edge part and the second side edge part; the first side edge part, the third side edge part and the second side edge part are all used for supporting the first magnetic core cover plate or the second magnetic core cover plate, and the first side edge part and the second side edge part are used for supporting the first magnetic core cover plate or the second magnetic core cover plate from two opposite sides respectively, so that the combined magnetic core structure is firmer. The magnetic element comprises the magnetic core structure, the windings are arranged on the at least two winding posts, and the directions of magnetic fluxes on the adjacent winding posts are opposite, so that the magnetic fluxes between the magnetic core cover plates can be mutually offset, the volume and the weight of the magnetic core structure are reduced, and the loss of the magnetic core is reduced.
Description
Technical Field
The invention relates to a magnetic core structure and a magnetic element.
Background
With the development of technologies such as big data and cloud computing, the consumption of electric energy is increased, which promotes the rapid development of the technology of the switch power supply, so that the switch power supply product needs to have the characteristics of high efficiency, high power density and the like. However, in the prior art, the magnetic element still occupies a large proportion of the volume and weight of the entire power supply system. In order to reduce the volume of the magnetic device, a means is generally adopted to raise the operating frequency of the switching power supply. However, the increase in the operating frequency increases losses associated with the operating frequency, such as switching losses and driving losses of the switching device, ac losses of the magnetic element, etc., and also reduces the efficiency of the switching power supply. In addition, simply increasing the operating frequency, there is a limit to the volume of the magnetic element, which limits further miniaturization of the magnetic element.
There is a magnetic core structure in the prior art that includes a first magnetic cover, a second magnetic cover, two winding posts, and a common side post. The winding post and the public side post are arranged between the first magnetic cover and the second magnetic cover, at least two winding posts are arranged opposite to the public side post, a protruding part is arranged on the side face of the public side post, and the protruding part extends towards the gap direction between two adjacent winding posts. The magnetic element in the technical scheme integrates the functions of the inductor and the transformer, is easy to realize power expansion, and is beneficial to avoiding the heat dissipation problem, the cost problem and the like caused by the increase of the number of layers of the printed circuit board. However, this solution has the following drawbacks:
(1) The winding mode provided by the technical scheme ensures that the magnetic flux directions of the two winding posts are consistent, and magnetic fluxes in the first magnetic cover and the second magnetic cover are not counteracted. In the design scenario where the magnetic flux density needs to be ensured to be small, the first magnetic cover, the second magnetic cover and the side posts need to have a certain thickness to ensure the magnetic flux density to be small, which in fact inevitably increases the volume and weight of the magnetic core structure.
(2) In view of the fact that the winding post is provided with the air gap, the winding post has no supporting effect on the magnetic cover positioned on the upper portion, when the first magnetic cover and the second magnetic cover are assembled, the magnetic cover positioned on the upper portion can only be supported by the side post and the protruding portion, but the side post and the protruding portion are only positioned on one side of the magnetic cover, form a thin and long shape along the length direction of the magnetic cover, and cannot form stable support on the magnetic cover positioned on the upper portion, no effective support on the upper portion magnetic cover is formed on the other side of the side post and the protruding portion, and the structure of the first magnetic cover and the second magnetic cover after being assembled is unstable. Meanwhile, in some application scenarios, windings on adjacent winding posts need to be connected in series or in parallel, and the protrusions in the patent affect the wiring of the circuit.
Disclosure of Invention
In order to solve the above-mentioned technical drawbacks of the prior art, the present invention provides a magnetic core structure and a magnetic element comprising the magnetic core structure.
The first aspect of the present invention provides a magnetic core structure, including a first magnetic core cover plate, a second magnetic core cover plate, at least two winding posts and one side post located between the first magnetic core cover plate and the second magnetic core cover plate, wherein an air gap is arranged on the winding post, the side post includes a first side edge portion, a second side edge portion and a third side edge portion connected between the first side edge portion and the second side edge portion, and the first side edge portion, the third side edge portion and the second side edge portion are sequentially connected to form a structure with three sides surrounding and one side opening; the at least two winding posts are positioned in a region which is surrounded by three surfaces and formed by sequentially connecting the first side edge part, the third side edge part and the second side edge part; the first side edge part, the third side edge part and the second side edge part are all used for supporting the first magnetic core cover plate or the second magnetic core cover plate, and the first side edge part and the second side edge part are used for supporting the first magnetic core cover plate or the second magnetic core cover plate from two opposite sides respectively.
In a preferred embodiment, the at least one winding post is disposed with its cross-sectional length dimension greater toward the opening of the side post.
In a preferred embodiment, the end of the winding post facing the side post opening does not exceed the connecting line between the end of the first side edge portion located at the side post opening and the end of the second side edge portion located at the side post opening.
As a preferred embodiment, the inner side of the side column is a continuous surface, and no protruding part is provided.
As a preferred embodiment, the first side edge portion, the third side edge portion, and the second side edge portion each extend in a straight line or in a curved manner in the longitudinal direction thereof; the first side edge part and the third side edge part are in arc transition connection, or the first side edge part and the third side edge part are in certain angle connection; the second side edge part is in arc transition connection with the third side edge part, or the second side edge part is in certain angle connection with the third side edge part.
In a preferred embodiment, the first side edge portion, the third side edge portion and the second side edge portion each have a certain arc in the length direction, the first side edge portion and the third side edge portion are in arc transition connection, and the second side edge portion and the third side edge portion are in arc transition connection.
As a preferred embodiment, the first side edge portion, the third side edge portion and the second side edge portion extend along a straight line in the length direction, the first side edge portion and the third side edge portion are in arc transition connection, the second side edge portion and the third side edge portion are in arc transition connection, and the first side edge portion and the second side edge portion are perpendicular to the length direction of the third side edge portion in the length direction.
As a preferred embodiment, the first side portion and the second side portion are equal or unequal in length.
As a preferred embodiment, two winding posts and one side post are arranged on the second magnetic core cover plate, an air gap is arranged at the end part of the two winding posts, which is close to the first magnetic core cover plate, the second magnetic core cover plate, the two winding posts and the one side post form an E-shaped magnetic core, the first magnetic core cover plate forms an I-shaped magnetic core, and the E-shaped magnetic core and the I-shaped magnetic core form an EI-shaped magnetic core structure.
As a preferred embodiment, two winding posts and one side post between the first magnetic core cover plate and the second magnetic core cover plate are divided into two parts along a plane parallel to the magnetic core cover plate, and the two parts are respectively arranged on the first magnetic core cover plate and the second magnetic core cover plate; an air gap is arranged between the two winding post parts positioned on the first magnetic core cover plate and the two winding post parts positioned on the second magnetic core cover plate; two wrapping posts and side posts on the first magnetic core cover plate form an E-shaped magnetic core, two wrapping posts and side posts on the second magnetic core cover plate form another E-shaped magnetic core, and the two E-shaped magnetic cores form an EE-shaped magnetic core structure.
Another aspect of the present invention is to provide a magnetic element, including the magnetic core structure of any one of the foregoing embodiments, wherein windings are disposed on the at least two winding legs, and magnetic fluxes on adjacent winding legs are opposite in direction.
As a preferred embodiment, the winding is fed or fed via the opening of the limb.
As a preferred embodiment, the direction of current flow through the windings on adjacent winding legs is set such that the direction of magnetic flux on adjacent winding legs is opposite.
As a preferred embodiment, the winding direction of the winding on the adjacent winding leg is configured such that the magnetic flux on the adjacent winding leg is opposite in direction.
As a preferred embodiment, the windings on the at least two winding legs are used individually, in series, or in parallel.
As a preferred embodiment, at least two windings are provided on at least one of the winding legs.
As a preferred embodiment, at least one winding post of the at least two winding posts is provided with two windings, wherein one winding is used as a primary winding, and the other winding is used as a secondary winding, so as to form a transformer; at least one other winding post is provided with a winding to form an inductor.
Compared with the prior art, the invention has the remarkable advantages and beneficial effects that:
1. the side column comprises a first side part and a second side part which are positioned at two sides, and a third side part which is connected between the first side part and the second side part, wherein the first side part, the third side part and the second side part are sequentially connected to form a structure with three sides surrounding and one side opening; the two winding posts are arranged on the inner sides of the side posts, namely, the two winding posts are positioned in the area surrounded by three surfaces formed by sequentially connecting the first side edge part, the third side edge part and the second side edge part. Besides the supporting function of the third side edge part, the first side edge part and the second side edge part respectively support the first magnetic core cover plate or the second magnetic core cover plate from the left side and the right side which are opposite, so that the combined magnetic core structure is more stable.
2. The direction of the magnetic flux on the adjacent winding posts is opposite by setting the direction of the current flowing through the windings on the adjacent winding posts or the direction of the winding on the adjacent winding posts is opposite. So that the magnetic fluxes between the core cover plates can cancel each other. Under the application scene of realizing that the magnetic flux density is little, can reduce the volume and the weight of magnetic core structure, reduce the loss of magnetic core.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
Fig. 1 is a schematic diagram of a magnetic core structure according to an exemplary embodiment of the present invention.
Fig. 2 is a schematic diagram of a magnetic core structure according to another exemplary embodiment of the present invention.
Fig. 3 is a schematic diagram of a magnetic core structure according to another exemplary embodiment of the present invention.
Fig. 4 is a schematic diagram of a magnetic core structure according to another exemplary embodiment of the present invention.
Fig. 5 is a schematic diagram showing the structure of a magnetic element according to an exemplary embodiment of the present invention.
Fig. 6 is a schematic diagram showing a structure of a magnetic element according to another exemplary embodiment of the present invention.
Fig. 7 is a schematic view showing a structure of a magnetic element according to another exemplary embodiment of the present invention.
Fig. 8 is a schematic diagram showing a structure of a magnetic element according to another exemplary embodiment of the present invention.
Fig. 9 is a schematic diagram showing a structure of a magnetic element according to another exemplary embodiment of the present invention.
Fig. 10 is a schematic view showing a structure of a magnetic element according to another exemplary embodiment of the present invention.
Fig. 11 is a schematic view showing a structure of a magnetic element according to another exemplary embodiment of the present invention.
Detailed Description
It is easy to understand that various embodiments of the present invention can be envisioned by those of ordinary skill in the art without altering the true spirit of the present invention in light of the present teachings. Accordingly, the following detailed description and drawings are merely illustrative of the invention and are not intended to be exhaustive or to limit or restrict the invention. Rather, these embodiments are provided so that this disclosure will be thorough and complete by those skilled in the art. Preferred embodiments of the present invention are described in detail below with reference to the attached drawing figures, which form a part of the present application and are used in conjunction with embodiments of the present invention to illustrate the innovative concepts of the present invention.
Fig. 1 is a schematic view of an embodiment of a magnetic core structure according to the present invention. As shown in fig. 1, the magnetic core structure of this embodiment includes a first magnetic core cover plate a located at an upper portion, a second magnetic core cover plate B located at a lower portion, two winding posts D, E and a "" type side post C.
Two winding posts D, E and a "" shaped leg C are disposed between the first core cover plate a and the second core cover plate B. The two bobbins D, E are provided with an air gap. The "" side column C includes a first side portion C1 and a second side portion C2 located at two sides, and a third side portion C3 connected between the first side portion C1 and the second side portion C2, where the first side portion C1, the third side portion C3, and the second side portion C2 are sequentially connected to form a structure with three sides surrounding and one side opening. The two winding posts D, E are disposed inside the "" shaped leg C, that is, the two winding posts D, E are disposed in a three-sided enclosed area formed by sequentially connecting the first side portion C1, the third side portion C3, and the second side portion C2.
After the first magnetic core cover plate a and the second magnetic core cover plate B are assembled, the first side edge portion C1, the third side edge portion C3 and the second side edge portion C2 all play a supporting role on the first magnetic core cover plate a or the second magnetic core cover plate B, and the two winding posts D, E are provided with air gaps and do not play a supporting role on the first magnetic core cover plate a or the second magnetic core cover plate B. The first side portion C1, the third side portion C3 and the second side portion C2 are sequentially connected to form a structure with three surrounding surfaces and one opening, so that the ends of the first side portion C1 and the second side portion C2 extend from the opposite left and right sides to the opening of the side column C, and the first side portion C1 and the second side portion C2 support the first magnetic core cover plate a or the second magnetic core cover plate from the opposite left and right sides, respectively, so that the combined magnetic core structure is more stable.
As a preferred mode of this embodiment, the direction in which the cross-sectional length dimension of the winding post is larger is disposed toward the opening of the side post. Specifically, the cross sections of the two winding posts D, E have lengths perpendicular to each other in the transverse and longitudinal directions, wherein the direction of the greater length dimension is toward the opening of the side post. As shown in fig. 1, the two winding posts D, E have a racetrack shape in cross section, and the two winding posts D, E have a longer dimension parallel to the first and second side portions C1 and C2 than a width dimension perpendicular to the third side portion C3. By such arrangement, the size ratio of the first side portion C1 (or the second side portion C2) to the third side portion C3 can be increased, so that the magnetic core structure is not longer along the third side portion C3 and shorter along the first side portion C1 and the second side portion C2, and the magnetic core structure is prevented from being entirely formed into a long and narrow structure. The support stability can be further increased if the length of the first side portion C1 and the second side portion C2 is longer, i.e., the length of the both side support portions is increased, with respect to the elongated structure. If the first side portion C1 and the second side portion C2 are very short in length and the third side portion C3 is long, the main supporting force is still on the third side portion C3, and the technical effect of effective both side support is not formed. In general, the lengths of the first and second side portions C1 and C2 are adaptively set according to the length of the cross section of the winding post D, E.
As another preferable mode of this embodiment, the end of the at least two winding posts D, E facing the opening of the side post C does not exceed the line between the end of the first side edge portion C1 at the opening of the side post and the end of the second side edge portion C2 at the opening of the side post. That is, the ends of the first side portion C1 and the second side portion C2 facing the pillar opening direction extend all the way to the pillar opening direction beyond the ends of the two bobbins D, E facing the pillar C opening. In this way, the two winding posts D, E are completely located in the three-sided enclosed area formed by sequentially connecting the first side portion C1, the third side portion C3 and the second side portion C2, and the entire center of gravity of the magnetic core structure is completely located between the first side portion C1 and the second side portion C2. The first side portion C1 and the second side portion C2 support the first magnetic core cover plate a or the second magnetic core cover plate from opposite left and right sides, respectively, so that the combined magnetic core structure is more stable.
As another preferable mode of this embodiment, the inner side of the side pillar is a continuous surface, and no protruding portion is provided. That is, after the first side portion C1, the third side portion C3, and the second side portion C2 are connected in order, the inner side thereof is a continuous surface, so that the winding wire is not affected. If the inner side of the side column is provided with a bulge, the bulge needs to be avoided when the winding is routed, and the routing is inconvenient.
As another preferable mode of the present embodiment, the first side edge portion C1, the third side edge portion C3, and the second side edge portion C2 extend in a straight line or are bent in the longitudinal direction. The first side edge C1, the third side edge C3, and the second side edge C2 may have a straight strip-shaped structure, a curved extending structure, or an arc-shaped structure in the longitudinal direction.
As an alternative implementation manner of this embodiment, the cross-sectional shape of the winding leg D, E may be one or several of square, round, oval or racetrack, and the cross-sectional shape of the winding leg D, E shown in fig. 1 is racetrack, or may be arbitrarily combined according to practical needs, for example, the cross-sectional shape of the winding leg D is racetrack, and the cross-sectional shape of the winding leg E is round. The cross-sectional area of the winding leg D, E can be set according to practical requirements, and the cross-sectional area of the winding leg D and the cross-sectional area of the winding leg E can be equal or unequal. If the cross section of the winding post D is square or circular and the cross section of the winding post E is oval or racetrack-shaped, the length direction of the larger cross section of the winding post E is disposed toward the opening of the side post.
For an alternative implementation manner of this embodiment, the lengths of the first side portion C1 and the second side portion C2 may be set according to actual requirements, and the lengths of the first side portion C1 and the second side portion C2 may be equal or unequal. Meanwhile, according to practical requirements, the end surfaces of the first side edge portion C1 and the second side edge portion C2 in the opening direction of the side pillar C may be set to exceed or not exceed the end surface of the winding pillar D, E in the opening direction.
For an alternative implementation of this embodiment, the cross-sectional shapes of the first side portion C1, the second side portion C2, and the third side portion C3 that constitute the side pillar C may be rectangular or other shapes according to actual requirements. The cross-sectional areas of the first side portion C1, the second side portion C2 and the connecting portion C3 may be set according to actual requirements, and the cross-sectional areas of the three may be equal or unequal.
For an alternative implementation manner of this embodiment, the connection between the first side edge portion C1 and the third side edge portion C3, and the connection between the second side edge portion C2 and the third side edge portion C3 may be arc-shaped, right angle-shaped, obtuse angle-shaped, or any combination of the above. For example, the first side portion C1 and the third side portion C3 are connected in an arc shape, or the first side portion C1 and the third side portion C3 are connected at a right angle or an obtuse angle. In the embodiment shown in fig. 1, the connection between the first side portion C1 and the second side portion C2 and the third side portion C3 is curved on the inner side and right-angled on the outer side. It will be appreciated that other means of transition connection may be employed in the embodiment shown in fig. 1.
In the embodiment shown in fig. 1, the first side portion C1, the third side portion C3 and the second side portion C2 extend along a straight line in the length direction, the first side portion C1 and the third side portion C3 are in arc transition connection, the second side portion C2 and the third side portion C3 are in arc transition connection, and the first side portion C1 and the second side portion C2 are perpendicular to the length direction of the third side portion C3 in the length direction.
According to the magnetic core structure, the two winding posts D, E are provided with air gaps, the air gap lengths of the two winding posts D, E can be set according to actual requirements, the air gap lengths of the D posts and the E posts can be equal or unequal, and the air gap is not formed in the -type side post C.
The winding post D, E with the magnetic core structure can be arranged as any combination of a transformer magnetic post and an inductance magnetic post according to actual requirements; when the magnetic core structure is used as an inductor magnetic core, the winding posts D, E can be all arranged as inductor magnetic posts; when the magnetic core structure is used as a magnetic core of a transformer, the winding posts D, E can be all arranged as magnetic posts of the transformer; when the magnetic core structure is used as a magnetic core of the combination of the inductor and the transformer, the winding post D can be set as an inductance magnetic post, and the winding post E can be set as a transformer magnetic post.
The windings on the winding posts D, E can be connected in series, in parallel, independently or any combination thereof according to actual requirements. For example, when the inductor is used, the winding on the winding post D and the winding on the winding post E can be connected in series to form an inductor with larger inductance; the winding on the winding post D and the winding on the winding post E can be connected in parallel to form a high-current inductor; the winding on winding post D and winding on winding post E can also be used independently to form two independent inductors.
In the magnetic core structure shown in fig. 1, the second magnetic core cover B, the two winding posts D, E and the "" type side post E form a special-shaped "E" type magnetic core, the first magnetic core cover a forms an "I" type magnetic core, and the "E" type magnetic core and the "I" type magnetic core may form an "EI" type magnetic core structure.
As shown in fig. 2, another embodiment of the magnetic core structure may be an "EE" type magnetic core structure. The core structure includes a first core cover a, a second core cover B, two winding legs D, E and a "" type leg C. The winding post D, E and the side post C are divided into two parts along a plane parallel to the magnetic core cover plate, and the two parts are respectively arranged on the first magnetic core cover plate A and the second magnetic core cover plate B, so that an E-shaped magnetic core is respectively formed, and the two E-shaped magnetic cores can form an EE-shaped magnetic core structure. An air gap is arranged between the winding posts D, E respectively arranged on the first magnetic core cover plate A and the winding posts D, E arranged on the second magnetic core cover plate B, and the winding posts D, E arranged on the first magnetic core cover plate A are not contacted with the winding posts D, E arranged on the second magnetic core cover plate B.
The number of the winding posts of the magnetic core structure is not limited to two, more winding posts can be arranged according to actual demands, and the multiplexing output of a power supply and the power improvement can be realized by increasing the number of the winding posts in the magnetic core structure. For example, fig. 3 is a perspective view of one embodiment of a core structure with three winding posts. The core structure shown in fig. 3 differs from the embodiment shown in fig. 1 in that the structure shown in fig. 3 has three legs D, E, F. The three winding posts D, E, F can be set as any combination of transformer magnetic posts or inductance magnetic posts according to actual requirements to form an inductor or a transformer or a combination of the inductor and the transformer. Fig. 4 is a perspective view of one embodiment of the core structure with four winding posts. The core structure of fig. 4 differs from the embodiment of fig. 1 in that the structure of fig. 4 has four legs D, E, F, G. The four winding posts D, E, F, G can be set as any combination of the transformer magnetic posts and the inductance magnetic posts according to actual requirements to form an inductor or a transformer or a combination of the inductor and the transformer.
Other structures or variations of the core structures shown in fig. 3 and 4 are the same as the core structure of the embodiment shown in fig. 1, and are not described here again.
Fig. 5 is a perspective view of an embodiment of a magnetic element according to the present invention, which includes a core structure and windings wound on winding posts.
The magnetic core structure of the magnetic element embodiment shown in fig. 5 is the "EE" type magnetic core structure, and includes a first magnetic core cover plate a located at the upper portion, a second magnetic core cover plate B located at the lower portion, two winding posts D, E, and a side post C; the winding leg D, E and the side leg C are divided into an upper part and a lower part along a plane parallel to the magnetic core cover plate, the lower parts of the winding leg D, E and the side leg C are arranged on the second magnetic core cover plate B positioned at the lower part, and the upper parts of the winding leg D, E and the side leg C are arranged on the first magnetic core cover plate a positioned at the upper part, so that an "E" type magnetic core is respectively formed, and two "E" type magnetic cores can form an "EE" type magnetic core structure.
In the embodiment shown in fig. 5, W1 and W2 are windings around winding posts D and E, respectively, and windings W1 and W2 may be PCBs, varnished wires, triple insulated wires, copper strips or other forms of windings.
In the embodiment shown in fig. 5, winding leg D and winding W1 form one inductor, and winding leg E and winding W2 form the other inductor. According to actual requirements, the windings W1 and W2 can be used independently, and the windings W1 and W2 can be used in series or in parallel. The magnetic flux generated by the current in the winding W1 on the winding post D is Φ1, the magnetic flux Φ1 has a first direction, the magnetic flux generated by the current in the winding W2 on the winding post E is Φ2, and the magnetic flux Φ2 has a second direction, and the first direction and the second direction are opposite directions, so that the magnetic fluxes in the first magnetic core cover plate a and the second magnetic core cover plate B can be reduced, and the thicknesses of the first magnetic core cover plate a and the second magnetic core cover plate B can be reduced. As shown in fig. 5, the direction of the current I1 flowing through the winding W1 is clockwise, the direction of the magnetic flux Φ1 generated in the winding leg D is downward, the direction of the current I2 flowing through the winding W2 is counter-clockwise, the direction of the magnetic flux Φ2 generated in the winding leg E is upward, and the direction of the magnetic flux Φ1 is opposite to the direction of the magnetic flux Φ2. In short, the direction of the magnetic flux on adjacent winding legs can be reversed by setting the direction of the current flowing through the windings on adjacent winding legs. Or the winding direction of the windings on the adjacent winding posts is set so that the magnetic flux on the adjacent winding posts is opposite in direction.
The winding W1 and the winding W2 are led in and led out through the opening of the side column.
Compared to two separate inductors, the embodiment shown in fig. 5 integrates two inductors into one magnetic element, and since the direction of the magnetic flux Φ1 in the winding leg D is opposite to the direction of the magnetic flux Φ2 in the winding leg E, the magnetic fluxes in the core cover a, the core cover B, and the leg C can be reduced, so that the size of the magnetic element and the loss of the magnetic core can be reduced even in a design scene with a guaranteed small magnetic flux density, which is advantageous for miniaturization and high efficiency of the magnetic element.
Fig. 6 is a perspective view of another embodiment of the magnetic element according to the present invention, in which the winding W1 is connected in series with the winding W2, and the current-outflow end of the winding W1 is connected to the current-inflow end of the winding W2. As in the embodiment of fig. 5, the direction of the magnetic flux Φ1 generated by the current I1 in the winding W1 on the winding leg D is downward, the direction of the magnetic flux Φ2 generated by the current I1 in the winding W2 on the winding leg E is upward, and the direction of the magnetic flux Φ1 is opposite to the direction of the magnetic flux Φ2. The series connection of the winding W1 and the winding W2 can form an inductor with larger inductance, and compared with a single inductor with the same parameter, the size and the loss of the magnetic element can be reduced.
Fig. 7 is a perspective view of an embodiment of connecting the winding W1 and the winding W2 in parallel, and the principle thereof is the same as that of fig. 5, and will not be repeated.
In a specific embodiment of the present invention, the number of windings on each winding post is not limited to one, and a plurality of windings may be provided according to actual needs, and the plurality of windings may be divided into primary windings and secondary windings, and the primary windings, the secondary windings and the magnetic core structure may form a transformer, so that the transformer and the inductor or the transformer and the transformer may be integrated into one magnetic element.
Fig. 8 is a perspective view of one embodiment of integrating a transformer and an inductor into one magnetic element. The number of windings on the winding post D is two, the winding post D comprises a winding W1 and a winding W3, the winding post D, the winding W1 and the winding W3 can form a transformer, wherein the winding W1 is a primary winding, and the winding W3 is a secondary winding. The current I1 is an excitation current flowing through the primary winding W1 of the transformer, the current I2 is a current flowing through the winding W2, and the directions of magnetic fluxes Φ1 and Φ2 generated by the currents I1 and I2 on the winding posts are opposite to each other as in the above embodiment.
Although the specific embodiments shown in fig. 5, 6, 7 and 8 only show two winding posts, the embodiment of the invention is not limited to two winding posts, more winding posts can be arranged according to practical requirements, and the current inflow end, the series connection or parallel connection mode and the current direction of the winding around each winding post are reasonably arranged, so that the directions of magnetic fluxes passing through adjacent winding posts are opposite to each other, thereby reducing the size of the magnetic element and the loss of the magnetic core, and integrating N inductors and M transformers into one magnetic element (N, M is greater than or equal to 0).
Fig. 9-11 are perspective views of one embodiment of a magnetic element including three winding posts. The magnetic element shown in fig. 9 is integrated with three inductors, the magnetic element shown in fig. 10 is integrated with two inductors by one transformer, and the magnetic element shown in fig. 11 is integrated with one inductor by one transformer, wherein the windings of two winding posts are connected in series to form one inductor. The principle of fig. 9 to 11 is the same as that of the magnetic device of the present invention, and will not be described again.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto,
any changes or substitutions that would be easily recognized by those skilled in the art within the technical scope of the present disclosure are intended to be covered by the present invention.
It should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes described in the context of a single embodiment or with reference to a single figure in order to streamline the invention and aid those skilled in the art in understanding the various aspects of the invention. The present invention should not, however, be construed as including features that are essential to the patent claims in the exemplary embodiments.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
It should be understood that modules, units, components, etc. included in the apparatus of one embodiment of the present invention may be adaptively changed to arrange them in an apparatus different from the embodiment. The different modules, units or components comprised by the apparatus of the embodiments may be combined into one module, unit or component or they may be divided into a plurality of sub-modules, sub-units or sub-components.
Claims (14)
1. The magnetic core structure comprises a first magnetic core cover plate, a second magnetic core cover plate, at least two winding posts and one side post between the first magnetic core cover plate and the second magnetic core cover plate, wherein the winding posts are provided with air gaps,
the side column comprises a first side edge part, a second side edge part and a third side edge part connected between the first side edge part and the second side edge part, and the first side edge part, the third side edge part and the second side edge part are sequentially connected to form a structure with three surrounding surfaces and one opening surface;
the at least two winding posts are positioned in a region which is surrounded by three surfaces and formed by sequentially connecting the first side edge part, the third side edge part and the second side edge part;
the first side edge part, the third side edge part and the second side edge part are all used for supporting the first magnetic core cover plate or the second magnetic core cover plate, and the first side edge part and the second side edge part are respectively used for supporting the first magnetic core cover plate or the second magnetic core cover plate from two opposite sides; wherein,
the first side edge part, the third side edge part and the second side edge part respectively extend along a straight line or bend in the length direction; the first side edge part and the third side edge part are in arc transition connection, or the first side edge part and the third side edge part are in certain angle connection; the second side edge part is in arc transition connection with the third side edge part, or the second side edge part is in certain angle connection with the third side edge part; or alternatively
The first side edge part, the third side edge part and the second side edge part are respectively provided with a certain radian in the length direction, the first side edge part and the third side edge part are in arc transition connection, and the second side edge part and the third side edge part are in arc transition connection; or alternatively
The first side edge part, the third side edge part and the second side edge part extend along a straight line in the length direction, the first side edge part is in arc transition connection with the third side edge part, the second side edge part is in arc transition connection with the third side edge part, and the first side edge part and the second side edge part are perpendicular to the length direction of the third side edge part in the length direction.
2. The magnetic core structure of claim 1, wherein the at least one winding leg is disposed with a greater cross-sectional length dimension toward the opening of the leg.
3. The magnetic core structure of claim 2, wherein the end of the winding leg facing the leg opening does not exceed a line between the end of the first side portion at the leg opening and the end of the second side portion at the leg opening.
4. The magnetic core structure of claim 1, wherein the inner side of the leg is a continuous surface, and no projection is provided.
5. The magnetic core structure of claim 1, wherein the first side portion and the second side portion are equal or unequal in length.
6. The magnetic core structure of any of claims 1-5, wherein two winding posts and one side post are disposed on a second magnetic core cover plate, an air gap is disposed at an end of the two winding posts near the first magnetic core cover plate, the second magnetic core cover plate, the two winding posts and one side post form an E-shaped magnetic core, the first magnetic core cover plate forms an I-shaped magnetic core, and the E-shaped magnetic core and the I-shaped magnetic core form an EI-shaped magnetic core structure.
7. The magnetic core structure of any of claims 1-5, wherein the two winding legs and one side leg between the first magnetic core cover plate and the second magnetic core cover plate are divided into two parts along a plane parallel to the magnetic core cover plates, the two parts being disposed on the first magnetic core cover plate and the second magnetic core cover plate, respectively; an air gap is arranged between the two winding post parts positioned on the first magnetic core cover plate and the two winding post parts positioned on the second magnetic core cover plate; two wrapping posts and side posts on the first magnetic core cover plate form an E-shaped magnetic core, two wrapping posts and side posts on the second magnetic core cover plate form another E-shaped magnetic core, and the two E-shaped magnetic cores form an EE-shaped magnetic core structure.
8. A magnetic component comprising the magnetic core structure of any of claims 1-5, wherein windings are provided on the at least two winding limbs and the magnetic flux on adjacent winding limbs is in opposite directions.
9. The magnetic component of claim 8, wherein the winding is fed or fed through the opening of the leg.
10. The magnetic component of claim 9, wherein the direction of current flow through the windings on adjacent winding legs is set such that the direction of magnetic flux on adjacent winding legs is opposite.
11. The magnetic component of claim 9, wherein the winding direction of the windings on adjacent winding legs is configured such that the magnetic flux on adjacent winding legs is in opposite directions.
12. The magnetic component of claim 9, wherein the windings on the at least two winding legs are used alone, in series, or in parallel.
13. The magnetic component of claim 9, wherein at least one of the winding legs has at least two windings disposed thereon.
14. The magnetic component of claim 9, wherein in the at least two winding posts,
at least one winding post is provided with two windings, wherein one winding is used as a primary winding, and the other winding is used as a secondary winding, so as to form a transformer;
at least one other winding post is provided with a winding to form an inductor.
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