CN213400745U - Magnetic core, magnetic integrated device and circuit board, domestic appliance thereof - Google Patents
Magnetic core, magnetic integrated device and circuit board, domestic appliance thereof Download PDFInfo
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- CN213400745U CN213400745U CN202022319679.4U CN202022319679U CN213400745U CN 213400745 U CN213400745 U CN 213400745U CN 202022319679 U CN202022319679 U CN 202022319679U CN 213400745 U CN213400745 U CN 213400745U
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Abstract
The utility model discloses a magnetic core, magnetism integrated device and circuit board, domestic appliance because two-layer integrated structure about the magnetic core adopts, including first magnetic core subassembly and second magnetic core subassembly, supply the winding of different grade type to wind respectively and establish, realized being in the same place the magnetism device integration that will separate originally, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. First magnetic core subassembly or be provided with the second magnetic core part on the second magnetic core subassembly, second magnetic core part includes the first core of multistage, and is adjacent be provided with first air gap between the core, because second magnetic core part includes a plurality of air gaps, consequently can make the interval of each first air gap very little, can reduce the eddy current loss of magnetic device, reduce the magnetic interference to the magnetic core periphery when keeping the air gap performance the same with single big interval.
Description
Technical Field
The utility model relates to an electron device technical field especially relates to a magnetic core, magnetism integrated device and circuit board, domestic appliance thereof.
Background
Magnetic devices, such as filters, transformers, inductors, and the like, are widely used in the fields of power electronic power conversion, switching power supplies, variable frequency air conditioning systems, and the like. Magnetic devices are the primary devices that accomplish energy storage and conversion, filtering, and electrical isolation, and can affect the overall performance of the converter in a number of ways. The magnetic core is an important component of the magnetic part, and the volume of the magnetic core is an important factor influencing the volume and the weight of the magnetic part. At present, most of magnetic device products adopt a discrete magnetic core to be independently designed and used, so that the number of magnetic core devices is large, the size is large, and the cost is high. Among the prior art scheme, also have and adopt magnetism integrated technology, independent magnetism spare passes through the design of magnetic core structure promptly for the produced magnetic flux of two different magnetism spares produces the interact: either strengthened or weakened. The technology integrates the two magnetic pieces together, thereby achieving the purposes of reducing the volume of the magnetic pieces and reducing the cost. For a magnetic device for energy storage or filtering, an air gap is formed on a magnetic core in order to avoid saturation of the magnetic core, but the air gap causes large leakage inductance, large inductance eddy current loss and large magnetic interference to the periphery.
SUMMERY OF THE UTILITY MODEL
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the utility model provides a magnetic core, magnetism integrated device and circuit board, domestic appliance can further reduce the eddy current loss of magnetism device, reduce the magnetic interference to the magnetic core periphery on the basis that the realization reduces magnetism device volume.
In a first aspect, an embodiment of the present invention provides a magnetic core, including:
a first magnetic core assembly;
a second magnetic core assembly located below the first magnetic core assembly, the second magnetic core assembly including a first magnetic core portion having a shape of a closed continuous loop, the first magnetic core portion including a first arm portion near an upper side of the first magnetic core assembly, the first arm portion and the first magnetic core assembly constituting a first closed magnetic path;
the second magnetic core part is arranged on the first magnetic core assembly or the second magnetic core assembly and comprises multiple sections of first cores, and a first air gap is arranged between every two adjacent cores.
The embodiment of the utility model provides a magnetic core has following beneficial effect at least: the utility model discloses two-layer integrated structure about the magnetic core adopts, including first magnetic core subassembly and second magnetic core subassembly, supply the winding of different grade type to wind respectively and establish, realized will originally discrete magnetic device integrated together, can effectively reduce the volume of magnetic core and magnetic integrated device, reduction in production cost. The second magnetic core component comprises a first magnetic core part, the shape of the first magnetic core part is in a closed continuous ring shape to form a closed magnetic circuit used by a lower layer winding, in addition, a first arm part on the upper side of the first magnetic core part and the first magnetic core component form a first closed magnetic circuit used by an upper layer winding, and therefore the first arm part is shared by the upper and lower layers of closed magnetic circuits respectively, the size of the magnetic core and a magnetic core device using the magnetic core can be further reduced, and the wiring design of an electric control circuit board and the miniaturization design of the electric control circuit board, the electric control box and the like are facilitated. In order to avoid magnetic core saturation when a magnetic device used as energy storage or filtering is used, a second magnetic core part is arranged on the first magnetic core assembly or the second magnetic core assembly, the second magnetic core part comprises multiple sections of first core bodies, a first air gap is arranged between adjacent core bodies, and the second magnetic core part comprises multiple air gaps, so that the distance between the first air gaps can be small, the eddy current loss of the magnetic device can be reduced, and the magnetic interference on the periphery of the magnetic core can be reduced while the performance same as that of a single large-distance air gap is maintained.
In one embodiment of the present invention, the first magnetic core assembly includes a second arm and a folded arm disposed at both ends of the second arm, and the first arm, the second arm and the folded arm at both ends of the second arm form the first closed magnetic circuit. The folding arms arranged at the two ends of the second arm part and the first arm part form a closed continuous ring together, so that a first closed magnetic circuit is formed, the first closed magnetic circuit shares part of devices of the second magnetic core assembly, and the volume of the magnetic core can be reduced. And the folding arm structures at the two ends of the second arm part are conventional C-shaped magnetic cores, so that large-scale production is easy to realize.
In one embodiment of the present invention, the second magnetic core portion is disposed on any one section of the first magnetic core assembly in the first closed magnetic circuit. The second core segment may be optionally provided at a corresponding position in the upper first core assembly that constitutes the first closed magnetic circuit, for example, at the second arm portion or the folded arm portion.
In one embodiment of the present invention, the second magnetic core portion is disposed on one of the folded arms of the first magnetic core assembly. The second core portion is disposed on the folded arm of the first core assembly. The second magnetic core part with a plurality of air gaps is arranged on the folding arm, so that the processing and the winding can be conveniently carried out, the diffused magnetic flux entering the winding wound on the folding arm can be reduced, and the electromagnetic loss and the electromagnetic interference caused by the diffused magnetic flux are reduced.
The utility model discloses an embodiment, including two the second magnetic core portion, two the second magnetic core portion set up respectively in the second arm both ends on the folding arm. In this embodiment, the two folded arms on the first magnetic core assembly are provided with the second magnetic core portions. Therefore, under the condition of keeping the performance of the magnetic core to be equivalent, the design can ensure that the height of the first air gap on the second magnetic core part can be reduced, or the number of the first air gaps on the second magnetic core part can be reduced, or the width of the folded arm can be reduced, so that the volume of the magnetic core is further reduced.
In one embodiment of the present invention, the second core assembly further includes a third core portion, the third core portion being disposed in the middle of the first core portion. Because first magnetic core portion is continuous closed annular, set up in the winding that the third magnetic core portion of first magnetic core portion can the adaptation common mode inductance, when the common mode inductance winding is around establishing in the both sides of first magnetic core portion, the differential mode component of common mode inductance can be increased to the third magnetic core portion, when the common mode inductance winding is established in the third magnetic core portion, then can reduce the width of first magnetic core portion both sides limit post, reduces the volume of magnetic core.
In one embodiment of the present invention, the first magnetic core portion is kept away from the lower side of the first magnetic core assembly includes a third arm portion, and the third magnetic core portion is connected with the first arm portion and the third arm portion, respectively. The third magnetic core part is respectively connected with the first arm part and the third arm part of the first magnetic core part, and the arrangement can better arrange the position relation of the second magnetic core assembly wound on the lower layer and the second magnetic core assembly wound on the upper layer, thereby facilitating the arrangement and distribution of magnetic circuits.
In one embodiment of the present invention, the first magnetic core portion is kept away from the lower side of the first magnetic core assembly includes a third arm portion, one end of the third magnetic core portion is connected with the third arm portion, and the other end is formed with a second air gap between the first arm portion. A second air gap is formed between the third magnetic core part and the first arm part, so that the winding of the second magnetic assembly can be improved, and the uniformity of inductance is improved.
In one embodiment of the present invention, the second magnetic core portion is disposed between the first arm portion and the second arm portion. The second magnetic core part is arranged between the first arm part and the second arm part, namely the second magnetic core part is arranged between the annular magnetic core components formed by the first arm part, the second arm part and the folding arms, so that a second air gap is not required to be arranged on the second arm part and the folding arms at two ends of the second arm part, the volumes of the second arm part and the folding arms at two ends of the second arm part can be designed to be smaller, in addition, the second magnetic core part can be used for winding a winding of a differential mode inductor, and a plurality of first air gaps of the second magnetic core part can not only avoid the magnetic saturation of the differential mode inductor, but also can promote the differential mode component of the differential mode inductor.
In one embodiment of the present invention, a third air gap is formed between the folding arm at the two ends of the second arm portion and the first arm portion. The third air gap can avoid magnetic saturation of the magnetic device and can improve the uniformity of inductance of the winding.
In one embodiment of the present invention, the first magnetic core portion is located away from the lower side of the first magnetic core assembly includes a third arm portion, and the second magnetic core portion is disposed between the first arm portion and the third arm portion. The second magnetic core part is arranged between the first arm part and the third arm part, so that the winding of the common-mode inductor can be adapted, when the common-mode inductor winding is wound on two sides of the first magnetic core part, the differential mode component of the common-mode inductor can be increased, when the common-mode inductor winding is wound on the second magnetic core part, the width of the side column can be reduced under the condition of meeting the same magnetic flux, the size is reduced, and in addition, a plurality of first air gaps of the second magnetic core part can be adapted to the winding of the differential-mode inductor or the energy storage and filter inductor.
The utility model discloses an embodiment, still include fourth magnetic core portion, fourth magnetic core portion set up in on the first magnetic core subassembly, fourth magnetic core portion includes the multistage second core, and is adjacent be provided with the fourth air gap between the second core. Since the fourth core portion includes a plurality of air gaps, the pitch of each fourth air gap can be made small, and eddy current loss of the magnetic device and magnetic interference with the periphery of the core can be reduced while maintaining the same performance as a single large-pitch air gap.
The utility model discloses an embodiment, first magnetic core subassembly include the second arm with set up in the folding arm at second arm both ends, fourth magnetic core portion set up in first arm with between the second arm, fourth magnetic core portion sets up between the annular magnetic core subassembly that first arm, second arm and folding arm constitute promptly, just so need not to set up the second air gap on the folding arm at second arm and both ends, can design the folding arm volume at second arm and both ends littleer, the fourth magnetic core portion can supply the winding of differential mode inductance to wind in addition, a plurality of fourth air gaps of fourth magnetic core portion not only can be for avoiding differential mode inductance magnetic saturation, can promote the differential mode component of differential mode inductance moreover.
In one embodiment of the present invention, the first air gap is filled with a non-magnetic material. By filling the non-magnetic material in each first air gap, the function of the air gap can be maintained, and the rigidity of the magnetic core can be enhanced.
The utility model discloses an embodiment, the first arm the second arm with the second arm both ends the book arm seals and forms first annular opening, the shape is annular first magnetic core portion forms second annular opening including sealing, first annular opening's area does half of second annular opening area. The area of the first annular opening is half of that of the second annular opening, so that the size of the magnetic core can be reduced as much as possible on the basis of meeting the performance requirement of the magnetic integrated device.
In a second aspect, the present invention provides a magnetic integrated device, including the present invention in the first aspect, the first winding is wound around the first magnetic core component of the magnetic core, and the second winding is wound around the second magnetic core component of the magnetic core. Because the magnetic core that magnetism integrated device adopted adopts upper and lower two-layer integrated structure, including first magnetic core subassembly and second magnetic core subassembly, supply first winding and second winding to wind respectively and establish, realized being in the same place the magnetism device integration that originally separates, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. The second magnetic core assembly comprises a first magnetic core part which is in a closed continuous annular shape and forms a closed magnetic circuit used by a lower-layer winding, and in addition, a first arm part on the upper side of the first magnetic core part and the first magnetic core assembly form a first closed magnetic circuit used by an upper-layer winding. Meanwhile, in order to avoid magnetic core saturation when a magnetic device used as energy storage or filtering is used, a second magnetic core part is arranged on the first magnetic core component or the second magnetic core component, the second magnetic core part comprises multiple sections of first core bodies, and a first air gap is arranged between adjacent core bodies.
The third aspect of the present invention provides a circuit board, including the second aspect of the present invention provides a magnetic integrated device. Because the magnetic core that magnetism integrated device adopted in the circuit board adopts upper and lower two-layer integrated structure, including first magnetic core subassembly and second magnetic core subassembly, supply first winding and second winding to wind respectively and establish, realized being in the same place the magnetism device integration that will originally separate, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. The second magnetic core component comprises a first magnetic core part, the shape of the first magnetic core part is in a closed continuous ring shape to form a closed magnetic circuit used by a lower layer winding, in addition, a first arm part on the upper side of the first magnetic core part and the first magnetic core component form a first closed magnetic circuit used by an upper layer winding, and therefore the first arm parts are respectively shared by the upper layer closed magnetic circuit and the lower layer closed magnetic circuit, the size of the magnetic core and the magnetic integrated device can be further reduced, and the wiring design of a circuit board is facilitated. Meanwhile, in order to avoid magnetic core saturation when a magnetic device used as energy storage or filtering is used, a second magnetic core part is arranged on the first magnetic core component or the second magnetic core component, the second magnetic core part comprises multiple sections of first core bodies, and a first air gap is arranged between adjacent core bodies.
In a fourth aspect, the present invention provides a household electrical appliance, including the circuit board of the third aspect of the present invention. Because the circuit in the circuit board adopts magnetism integrated device, and the magnetic core in the magnetism integrated device includes first magnetic core subassembly and second magnetic core subassembly, supplies first winding and second winding to wind respectively and establishes, has realized that the magnetism device that will originally separate is integrated together, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. The second magnetic core component comprises a first magnetic core part, the shape of the first magnetic core part is in a closed continuous ring shape to form a closed magnetic circuit used by a lower-layer winding, in addition, a first arm part on the upper side of the first magnetic core part and the first magnetic core component form a first closed magnetic circuit used by an upper-layer winding, and therefore the first arm part is shared by the upper-layer closed magnetic circuit and the lower-layer closed magnetic circuit respectively, the size of the magnetic core and the size of the magnetic integrated device can be further reduced, the wiring design of a circuit board is facilitated, and the miniaturization arrangement of household electrical appliances is facilitated. Meanwhile, in order to avoid magnetic core saturation when a magnetic device used as energy storage or filtering is used, a second magnetic core part is arranged on the first magnetic core component or the second magnetic core component, the second magnetic core part comprises multiple sections of first core bodies, and a first air gap is arranged between adjacent core bodies.
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 hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
Fig. 1 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 2 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 3 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 4 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 5 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 6 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 7 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 8 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 9 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 10 is a structural view of a magnetic core provided in an embodiment of the present invention;
fig. 11 is a structural view of a magnetic core according to an embodiment of the present invention;
fig. 12 is a schematic circuit diagram applied to a magnetic integrated device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a magnetic integrated device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be understood that in the description of the embodiments of the present invention, a plurality or items are two or more, and greater than, less than, more than, etc. are understood as excluding the number, and greater than, less than, etc. are understood as including the number. If the description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate the precedence of the indicated technical features.
Magnetic devices, such as transformers and inductors for short, are widely used in the fields of power electronic power conversion, switching power supplies, variable frequency air conditioning systems, and the like, and are also important components of the switching power supplies. The magnetic component is the primary device that performs energy storage and conversion, filtering, and electrical isolation, and can affect the overall performance of the converter in a number of ways.
On the one hand, the magnetic member is the main factor influencing the volume and weight of the transducer, and according to statistics, the weight of the magnetic member is generally 30-40% of the total weight of the transducer, the volume accounts for 20-30% of the total volume, and for a power supply which works at high frequency and is designed in a modular manner, the proportion of the volume and the weight of the magnetic member is higher than the data given above. On the other hand, the selection of the magnetic part parameters such as the size of the output filter inductor directly affects the output current ripple and the output dynamic performance of the power supply. In yet another aspect, losses in the magnetic member can affect the efficiency of the converter.
If a plurality of magnetic devices are mutually independent, the occupied volume is large, and the layout of other elements on the circuit board can be seriously influenced. And because the volume of magnetic device can not be done for a short time, can seriously influence the power density of whole power module, simultaneously, the cost of a plurality of independent magnetic devices is very high, and the loss of magnetic core and winding copper loss are all great.
In order to reduce the volume and weight of the magnetic member and improve the filtering performance of the magnetic device, one way is to increase the frequency of the alternating current, but the high-frequency way still has certain limitations, and is not applicable to all scenes. In order to further reduce the volume and loss of the Magnetic element and ensure good performance of the converter, a Magnetic Integrated Magnetic (IM) technology can be adopted. Magnetic integration technology, that is, the design of a magnetic core structure by using a single magnetic piece, enables magnetic fluxes generated by two different magnetic pieces to interact: either strengthened or weakened. The technology integrates the two magnetic pieces together, thereby achieving the purposes of reducing the volume of the magnetic pieces and reducing the cost.
Although in principle any type of inductive device (e.g. filter inductor, transformer, etc.) may employ magnetic integration technology, it is practical to adjust the structure of the integrated magnetic core according to the type of integrated magnetic device, for example, for magnetic devices with energy storage or filtering, an air gap needs to be added to the magnetic core to avoid saturation of the magnetic core, so as to withstand a large dc magnetic flux. Increase the air gap and can outwards radiate the leakage magnetic flux on the magnetic core, the leakage magnetic flux can cut the winding coil and lead to leaking inductance and inductance eddy current loss, can produce great magnetic interference to the periphery moreover, influences the work of other components on the circuit board, and then makes domestic appliance's EMI performance decline.
The embodiment of the utility model provides a magnetic core, it is shown with reference to figure 1, this magnetic core includes:
a first magnetic core assembly 110, the first magnetic core assembly 110 being adapted to be wound with a first winding, the first winding being a coil winding of any type of magnetic device.
A second magnetic core assembly 120, the second magnetic core assembly 120 being adapted to be wound with a second winding, the second winding being a coil winding of any type of magnetic device. The coil winding types of the first winding and the second winding can be the same or different, for example, the first winding is a power inductance coil winding, and the second winding is a common mode inductance winding.
Referring to fig. 1, the second magnetic core assembly 120 is located below the first magnetic core assembly 110, which is equivalent to the first magnetic core assembly 110 being located at an upper layer and the second magnetic core assembly 120 being located at a lower layer. The second magnetic core assembly 120 includes a first magnetic core portion 130, the first magnetic core portion 130 is in a shape of a closed continuous loop, the first magnetic core portion 130 includes a first arm portion 131 near an upper side of the first magnetic core assembly 110, the first arm portion 131 and the first magnetic core assembly 110 form a first closed magnetic circuit, the first magnetic core portion 130 in the shape of the loop forms a second closed magnetic circuit, the first arm portion 131 and the first magnetic core assembly 110 form the first closed magnetic circuit for the first winding, and the second closed magnetic circuit of the first magnetic core portion 130 can be used for the second winding.
Referring to fig. 1, the first closed magnetic circuit and the second closed magnetic circuit have a common core segment, that is, the first arm 131 on the side of the second core assembly 120 close to the first core assembly 110 (or close to the upper core assembly) is a common core segment, that is, the first arm 131 is used as a part of both the first closed magnetic circuit and the second closed magnetic circuit, so that the first arm 131 is shared by the first closed magnetic circuit and the second closed magnetic circuit on the upper and lower layers, respectively, and therefore, the volumes of the magnetic core and the magnetic core device using the magnetic core can be further reduced, which is beneficial to the wiring design of the electronic control circuit board and the miniaturization design of the electronic control circuit board and the electronic control box. Additionally, because the embodiment of the utility model provides an in the magnetic core be upper and lower floor spatial structure, also can effectively reduce the area occupied of magnetic core on the circuit board, further be favorable to the wiring design of automatically controlled circuit board.
A second core part 140 is further included, the second core part 140 including a plurality of segments of first cores 141, and first air gaps 142 are provided between adjacent first cores 141. For energy storage or filtering magnetic devices, there is a need for energy storage, but as the magnetic field strength in the magnetic material increases, its magnetic flux density also increases, but when the magnetic field strength is large to some extent, its magnetic flux no longer increases, which is called magnetic saturation, which affects the ability of the magnetic core to store energy. To avoid saturation of the core, an air gap is added to the core to withstand a large dc flux.
The second magnetic core portion 140 may be disposed on the first magnetic core assembly 110 or the second magnetic core assembly 120, may be disposed on the first magnetic core assembly 110 or the second magnetic core assembly 120 as an additional component, for example, in a space enclosed by the first magnetic core assembly 110 or in the middle of the annular first magnetic core portion 130, or may be a part of the first magnetic core assembly 110, for example, a part of the first magnetic core assembly 110 is divided into a plurality of segments of the first core 141, such that a first air gap 142 is formed between adjacent first core portions 141, which is also equivalent to a plurality of first air gaps 142 opened in a part of the first magnetic core assembly 110, such that the first magnetic core assembly 110 between adjacent first air gaps 142 is divided into a plurality of first core portions 141. Since the second core portion 140 includes the plurality of first air gaps 142, the pitch of each first air gap 142 can be made small, and eddy current loss of the magnetic device and magnetic interference with the periphery of the core can be reduced while maintaining the same performance as a single large-pitch air gap. For example, assuming that the height of the first air gap 142 is h1, the second core 140 includes M first air gaps 142, and the height of a single air gap of equivalent performance is h2, such that h2 is M × h 1. The magnetic flux leaking from the air gap is equivalent to a semicircle or an arch taking the height of the air gap as a straight side on the cross section of the magnetic core, so the cross section area of the leaking magnetic flux is increased by a square multiple along with the increase of the height of the air gap, and is increased by a cubic multiple for an actual three-dimensional space. Therefore, when the air gap is divided into the plurality of first air gaps 142, the area of the magnetic flux leaking is greatly reduced, and thus the eddy current loss of the magnetic device can be reduced and the magnetic interference to the periphery of the magnetic core can be reduced while maintaining the same performance as that of a single air gap with a large pitch.
The first air gaps 142 may be filled with a non-magnetic material, and the material filled in the first air gaps 142 may be the same material. Alternatively, the first air gap 142 is filled with a different material, which is not limited by the present invention, wherein the non-magnetic material may be an epoxy resin plate or the like. The first air gap 142 may be filled with a magnetic conductive material, and the magnetic permeability of the magnetic conductive material filled in the first air gap 142 needs to be smaller than the magnetic permeability of the first magnetic core assembly 110 and the second magnetic core assembly 120. Wherein the heights of the plurality of first air gaps 142 on the second core 140 may be the same or different. By filling each first air gap 142 with a non-magnetic material or a magnetic material, the stiffness of the magnetic core can be enhanced while maintaining the function of the air gap.
In addition, the first air gap 142 may not be filled, and in this case, it is also understood that the first air gap 142 is filled with air.
The first and second magnetic core assemblies 110 and 120 may be made of a common magnetic core material, such as ferrite, silicon steel sheet, or iron-nickel alloy. The first magnetic core assembly 110 may be integrally connected with the second magnetic core assembly 120 or separately connected in contact. The first core assembly 110 and the second core assembly 120 may be integrally formed, which is effective to reduce magnetic loss, but requires a customized core mold. First magnetic core subassembly 110 is connected with the components of a whole that can function independently contact of second magnetic core subassembly 120, can have a small clearance between two magnetic core subassemblies, has certain magnetic loss, but first magnetic core subassembly 110 and second magnetic core subassembly 120 can adopt the magnetic core subassembly of current common shape to assemble and form, can directly adopt current magnetic core subassembly, and manufacturing cost is lower.
Referring to fig. 1, the "upper", "lower", "upper layer" and "lower layer" of the embodiment of the present invention only describe the relative positions of the first magnetic core assembly 110 and the second magnetic core assembly 120, wherein the second magnetic core assembly 120 can be mounted on a circuit board, and at this time, the first magnetic core assembly 110 is located above the second magnetic core assembly 120. It is understood that the core may be inverted entirely, i.e., the first core assembly 110 is mounted to the circuit board and the second core assembly 120 is positioned above the first core assembly 110.
Referring to fig. 1, the first core assembly 110 includes a second arm 111 and folded arms 112 disposed at two ends of the second arm 111, the second arm 111 is shaped as a straight column, the two folded arms 112 of the second arm 111 are bent in the same direction, the two folded arms 112 are perpendicular to the second arm 111, and the second arm 111 and the folded arms 112 at two ends form a C-shaped core assembly. The second magnetic core assembly 120 is in a closed ring shape, the second magnetic core assembly 120 includes a first arm portion 131 and a third arm portion 132 that are parallel to each other, a fourth arm portion 133 and a fifth arm portion 134 that are parallel to each other, the first arm portion 131 and the fourth arm portion 133 are perpendicular to each other, and the first arm portion 131, the third arm portion 132, the fourth arm portion 133 and the fifth arm portion 134 form a closed square in a ring shape. The first arm portion 131 is parallel to the second arm portion 111, and the folded arm 112 at one end of the second arm portion 111 is connected to the second arm portion 111. Thus, the first arm portion 131, the folded arms 112 at both ends, and the second arm portion 111 form a rectangle, and a first closed magnetic circuit is formed. The first arm 131, the third arm 132, the fourth arm 133, and the fifth arm 134 of the second core assembly 120 constitute a second closed magnetic circuit, in which the second arm 111 is shared by the first closed magnetic circuit and the second closed magnetic circuit, enabling a reduction in the volume of the core. And the folded arms 112 at the two ends of the second arm 111 are of conventional C-shaped magnetic cores, so that mass production is easy to realize.
The second core portion 140 may be disposed on any segment of the first magnetic core assembly 110 in the first closed magnetic circuit. For example, may be provided on the second arm portion 111 or the folded arm 112. Referring to fig. 1, the second core portion 140 is disposed on one of the folded arms 112 of the first core assembly 110. A plurality of first air gaps 142 are formed on one of the folded arms 112 corresponding to the first core assembly 110 to form the second core portion 140. By providing the second core portion 140 having a plurality of air gaps on the knuckle 112, the processing can be facilitated. The second core part 140 on the folding arm 112 can be used for winding, and the plurality of first air gaps 142 on the second core part 140 can reduce the diffused magnetic flux entering the winding wound on the folding arm 112, and reduce the electromagnetic loss and the electromagnetic interference caused by the diffused magnetic flux.
As shown in fig. 2, two second core parts 140 may be provided, and the two second core parts 140 may be provided on the folded arms 112 at both ends of the second arm portion 111, respectively. It is also understood that the first air gap 142 is opened on both folding arms 112 of the first magnetic core assembly 110. Thus, the height of the first air gap 142 on the second magnetic core part 140 can be reduced, or the number of the first air gaps 142 on the second magnetic core part 140 can be reduced, or the width of the folding arm 112 can be reduced, so that the volume of the magnetic core is further reduced under the condition of keeping the performance of the magnetic core unchanged. Thus, the height of the first air gap 142 on the second magnetic core part 140 can be reduced, or the number of the first air gaps 142 on the second magnetic core part 140 can be reduced, or the width of the folding arm 112 can be reduced, so that the volume of the magnetic core can be further reduced under the condition of keeping the performance of the magnetic core to be equivalent.
Referring to fig. 3, in addition to the magnetic core shown in fig. 1, a third magnetic core portion 310 may be further disposed on the second magnetic core assembly 120, wherein the third magnetic core portion 310 is disposed in the middle of the first magnetic core portion 130, and may be perpendicular to the first arm portion 131 and the third arm portion 132 in the first magnetic core portion 130, for example. Because the first core portion 130 is a continuous closed ring shape, the third core portion 310 disposed on the first core portion 130 can be adapted to winding of the common mode inductor, when the common mode inductor winding is disposed on two sides of the first core portion 130, the third core portion 310 can increase a differential mode component of the common mode inductor, and when the common mode inductor winding is disposed on the third core portion 310, the widths of pillars on two sides of the first core portion 130 can be reduced, and the volume of the magnetic core can be reduced. In addition, this arrangement enables better arrangement of the positional relationship of the second core assembly 120 around the lower layer and the second core assembly 120 around the upper layer, facilitating the arrangement and distribution of the magnetic circuits.
The third core portion 310 may be integrally formed with the first core portion 130, and the third core portion 310 may serve as a center pillar of the first core portion 130. In addition, an air gap may be formed between the third core portion 310 and the first core portion 130, for example, one end of the third core portion 310 is connected to the first arm portion 131 or the third arm portion 132, and the other end is formed with the first core portion 130. The air gap provided in the center pillar of the first core portion 130 may be to avoid magnetic saturation of the energy storage or filter core device.
Referring to fig. 4, the second core portion 140 may be disposed between the first arm portion 131 and the second arm portion 111. For example, the second core portion 140 may be provided in the annular core assembly formed by the second arm portion 111, the first arm portion 131, and the both-end folded arms 112 thereof, that is, the second core portion 140 may be provided as the center pillar of the first core assembly 110. Therefore, the second arm part 111 and the folded arms 112 at two ends thereof do not need to be provided with the second air gap 710, the second arm part 111 and the folded arms 112 at two ends thereof can be designed to be smaller in volume, in addition, the second magnetic core part 140 can be used for winding the windings of the differential mode inductance, and the plurality of first air gaps 142 of the second magnetic core part 140 not only can avoid the magnetic saturation of the differential mode inductance, but also can improve the differential mode component of the differential mode inductance. The magnetic core shown with reference to fig. 4 may be formed by combining an E-shaped magnetic core and a square magnetic core, and the second magnetic core portion 140 is formed by disposing a plurality of first air gaps 142 on a center pillar of the E-shaped magnetic core. As shown in fig. 5, the core may be a combination of an 8-shaped core and an I-shaped core, and the second core portion 140 may be formed by providing a plurality of first air gaps 142 in the I-shaped core.
Referring to fig. 6, in addition to the magnetic core shown in fig. 4, a third magnetic core portion 310 may be provided at the middle of the first magnetic core portion 130 as a center pillar of the first magnetic core portion 130. Because the first core portion 130 is a continuous closed ring shape, the third core portion 310 disposed on the first core portion 130 can be adapted to winding of the common mode inductor, when the common mode inductor winding is disposed on both sides of the first core portion 130, the third core portion 310 can increase a differential mode component of the common mode inductor, and when the common mode inductor winding is disposed on the third core portion 310, the widths of the pillars on both sides of the first core portion 130 can be reduced, and the volume of the magnetic core can be reduced. In addition, this arrangement enables better arrangement of the positional relationship around the lower-layer second core assembly 120 and the upper-layer second core assembly 120, facilitating the arrangement and distribution of the magnetic circuits. In the magnetic core shown in fig. 6, the third core portion 310 may be an 8-shaped magnetic core integrated with the first core portion 130.
As shown in fig. 7, a second air gap 710 may be formed between the third core portion 310 and the first core portion 130 of the magnetic core shown in fig. 6, for example, one end of the third core portion 310 may be connected to the third arm portion 132, and the other end may be connected to the first arm portion 131 to form the second air gap 710. The second air gap 710 can improve the uniformity of inductance of the wound second magnetic assembly.
The third core portion 310 can be adapted to winding of a common mode inductor, when the common mode inductor winding is disposed on two sides of the first core portion 130, the third core portion 310 can increase a differential mode component of the common mode inductor, and when the common mode inductor winding is disposed on the third core portion 310, the width of the pillars on two sides of the first core portion 130 can be reduced, and the volume of the magnetic core can be reduced.
In addition, in the above embodiment, a third air gap 810 may be formed between the folded arm 112 at the two ends of the second arm 111 and the first arm 131. The third air gap 810 can avoid magnetic saturation of the magnetic device and can improve uniformity of winding inductance.
Referring to fig. 8, the second core portion 140 may be further disposed in the first core portion 130, that is, the second core portion 140 is disposed in the square formed by the first arm portion 131, the third arm portion 132, the fourth arm portion 133 and the fifth arm portion 134, for example, the second core portion 140 is disposed in the first core portion 130 as a center pillar of the first core portion 130 as shown in fig. 8, or the second core portion 140 is formed by opening a plurality of first air gaps 142 on the center pillar of the figure-8 core, and the second core portion 140 is perpendicular to the first arm portion 131 and the third arm portion 132, so that the winding of the common mode inductor can be adapted, when the common mode inductor winding is disposed on both sides of the first core portion 130, the second core portion 140 can increase the differential mode component of the common mode inductor, and when the common mode inductor winding is disposed on the second core portion 140, the width of the center pillar can be reduced to reduce the volume under the condition of satisfying the same magnetic flux, in addition, the plurality of first air gaps 142 of the second core portion 140 can accommodate winding of differential mode inductance or energy storage, filter inductance. In fig. 8, the second arm portion 111 of the first core assembly 110 and the folded arms 112 at two ends thereof form a C-shaped core, wherein a third air gap 810 is disposed between the folded arms 112 at two sides of the C-shaped core and the first core assembly 110, and the third air gap 810 can avoid magnetic saturation of the magnetic device and can improve uniformity of winding inductance. The folding arms 112 on both sides of the C-shaped magnetic core are respectively provided with the third air gaps 810, which is convenient for processing and manufacturing, and can reduce the height of the third air gaps 810, so that the volume of the first magnetic core assembly 110 is smaller. Magnetic saturation of the magnetic device can be avoided by the third air gap 810, and uniformity of winding inductance can be improved.
Referring to fig. 9, a center pillar is added to the C-shaped core of fig. 8, or the C-shaped core of fig. 8 is replaced with an E-shaped core, in addition to the core of fig. 8. An air gap is provided between the center leg of the E-core and the second core assembly 120. This can further reduce the height of the third air gap 810, resulting in a smaller volume for the first magnetic core assembly 110. Furthermore, the winding method of the magnetic device can be expanded by the arranged center pillar, and the winding of the magnetic device can be wound on the center pillar, so that the width of the folded arm 112 of the first magnetic core assembly 110 can be reduced, and the volume of the magnetic core can be reduced.
Referring to fig. 10, a fourth magnetic core portion 1010 may be added to the magnetic core shown in fig. 8, the fourth magnetic core portion 1010 is disposed on the first magnetic core assembly 110, the fourth magnetic core portion 1010 includes multiple segments of second cores 1011, and a fourth air gap 1012 is disposed between adjacent second cores 1011. The fourth core portion 1010 and the second core portion 140 have substantially the same structure and function. The height of each fourth air gap 1012 may be the same or different, and the fourth air gap 1012 may be filled with a non-magnetic conductive material or a magnetic conductive material having a magnetic permeability less than that of the first and second magnetic core assemblies 110 and 120. The fourth air gap 1012 may also be unfilled or understood to be filled with air. Through setting up fourth magnetic core portion 1010, make first magnetic core subassembly 110 on upper strata and the second magnetic core subassembly 120 on lower floor all have the magnetic core portion of multistage air gap, make upper magnetic core subassembly and lower floor's magnetic core subassembly all can wind the winding of establishing energy storage or filtering magnetism device. Meanwhile, due to the arrangement of multiple air gaps, the distance between the fourth air gaps 1012 can be made small, so that the eddy current loss of a magnetic device can be reduced and the magnetic interference on the periphery of the magnetic core can be reduced while the performance of the magnetic device is maintained to be the same as that of a single air gap with a large distance. Referring to fig. 10, the fourth core portion 1010 serves as a center pillar of the first core assembly 110, i.e., the fourth core portion 1010 is perpendicular to the second arm portion 111. Here, it can be understood that the fourth core portion 1010 is added as a center pillar to the C-shaped core configured by the second arm portion 111 and the folded arms 112 at both ends thereof, or the fourth core portion 1010 is configured by opening a plurality of fourth air gaps 1012 on the center pillar of the E-shaped core. Since the fourth magnetic core 1010 can meet the integration requirement of the energy storage and filtering magnetic device, the folded arms 112 at two ends of the second arm 111 can be in contact with the first magnetic core 130, that is, no air gap is provided between the folded arms 112 and the first magnetic core 130, or an air gap is provided between only one folded arm 112 and the first magnetic core 130. As shown in fig. 10, a third air gap 810 may be provided between the folded arms 112 at the two ends of the second arm portion 111 and the first magnetic core portion 130, so that the height of the fourth air gap 1012 on the fourth magnetic core portion 1010 may be reduced, or the number of the fourth air gaps 1012 on the fourth magnetic core portion 1010 may be reduced, or the width of the folded arms 112 may be reduced to design the volume of the second arm portion 111 and the folded arms 112 at the two ends thereof to be smaller, so that the volume of the magnetic core is further reduced, and the plurality of fourth air gaps 1012 of the fourth magnetic core portion 1010 not only can avoid magnetic saturation of differential mode inductance, but also can improve the differential mode component of the differential mode inductance.
Further, as shown in fig. 11, the first core assembly 110 and the second core assembly 120 may be integrally formed due to the presence of the fourth core portion 1010, for example, an 8-shaped core, in which a center pillar is provided in an upper layer of the 8-shaped core, a plurality of fourth air gaps 1012 are opened in the center pillar in the upper layer to form the fourth core portion 1010, or a center pillar is provided in a lower layer of the 8-shaped core, and the plurality of first air gaps 142 start to form the second core portion 140 in the center pillar in the lower layer. A field-shaped magnetic core may be used, and the fourth core portion 1010 may be formed by providing a plurality of fourth air gaps 1012 in the center pillar of the upper layer of the field-shaped magnetic core, or the second core portion 140 may be formed by starting a plurality of first air gaps 142 in the center pillar of the lower layer of the field-shaped magnetic core.
In any of the above embodiments, the first arm portion 131, the second arm portion 111, and the folded arm 112 at two ends of the second arm portion 111 are closed to form a first annular opening, and the first magnetic core portion 130 having an annular shape includes a second annular opening closed to form a second annular opening, where an area of the first annular opening is half of an area of the second annular opening. The area of the first annular opening is half of that of the second annular opening, so that the size of the magnetic core can be reduced as much as possible on the basis of meeting the performance requirement of the magnetic integrated device. For example, the first arm portion 131 and the second arm portion 111 may have the same length, and the width of the folded arm 112 may be half the height of the first core portion 130.
The embodiment of the utility model provides a magnetism integrated device, magnetic core and first winding and second winding that above-mentioned arbitrary embodiment mentioned, first winding is around establishing on the first magnetic core subassembly 110 of magnetic core, the second winding is around establishing on the second magnetic core subassembly 120 of magnetic core. Because the magnetic core that magnetism integrated device adopted adopts upper and lower two-layer integrated structure, including first magnetic core subassembly 110 and second magnetic core subassembly 120, supply first winding and second winding to wind respectively and establish, realized will originally discrete magnetism device integration together, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. The second magnetic core assembly 120 includes the first magnetic core portion 130, the shape of the first magnetic core portion 130 is a closed continuous ring shape, and forms a closed magnetic path for the lower layer winding, and in addition, the first arm portion 131 on the upper side of the first magnetic core portion and the first magnetic core assembly 110 form a first closed magnetic path for the upper layer winding, and thus, the first arm portion 131 is respectively shared by the upper and lower layers of closed magnetic paths, so that the volumes of the magnetic core and the magnetic integrated device can be further reduced. Meanwhile, in order to avoid saturation of the magnetic core when the magnetic device used as an energy storage or filtering device is used, the first magnetic core assembly 110 or the second magnetic core assembly 120 is provided with the second magnetic core part 140, the second magnetic core part 140 comprises a plurality of sections of first cores 141, and a first air gap 142 is arranged between the adjacent cores, and the second magnetic core part 140 comprises a plurality of air gaps, so that the distance between the first air gaps 142 can be made small, and the eddy current loss of the magnetic integrated device and the magnetic interference on the periphery of the magnetic core can be reduced while the performance of the magnetic integrated device is maintained to be the same as that of a single air gap with a large distance.
Referring to fig. 12, for a specific application of the magnetic integrated device, fig. 12 shows a schematic structure diagram of a power factor correction circuit, where the power factor correction circuit includes an ac input terminal 1210, a common mode inductor LF, and a boost rectifier module 1220. Specifically, the ac input terminal 1210 is configured to input an ac electrical signal, the common mode inductor LF is configured to filter harmonic interference of the ac electrical signal, the common mode inductor LF is connected to the ac input terminal 1210, the boost rectifier module 1220 is connected to the common mode inductor LF, the boost rectifier module 1220 includes a power inductor L1 and an energy storage device, the power inductor L1 is configured to charge the energy storage device, the power inductor L1 includes the first winding 1230, and the common mode inductor includes the second winding 1240. In the prior art, the power inductor L1 and the common mode inductor LF are two independent magnetic devices, and the total volume of the magnetic devices is large, so that the occupied area of the magnetic devices on a circuit board is large, and the miniaturization of a product is not facilitated. Referring to fig. 13, the magnetic core of the magnetic integrated device according to the present invention is the magnetic core shown in fig. 1, the second magnetic core portion 140 is disposed on the first magnetic core assembly 110 on the upper layer in the magnetic core shown in fig. 1, and the second magnetic core portion 140 has a plurality of first air gaps 142, which can improve energy storage, so that the first magnetic core assembly 110 is suitable for winding the first winding 1230 of the power inductor in the circuit shown in fig. 12, and the first magnetic core portion 130 on the lower layer in the magnetic core shown in fig. 1 is a continuous annular magnetic core, which is suitable for winding the second winding 1240 of the common mode inductor in the circuit shown in fig. 12. Since the second core part 140 includes the multiple segments of the first cores 141, the first air gaps 142 are disposed between adjacent cores, and since the second core part 140 includes multiple air gaps, the distance between the first air gaps 142 can be made small, and eddy current loss of the magnetic integrated device and magnetic interference on the periphery of the magnetic core can be reduced while maintaining the same performance as a single air gap with a large distance. Fig. 13 shows an implementation manner of the magnetic integrated device of the present invention, and it can be understood that the magnetic integrated device provided by the embodiment of the present invention can adopt any type of magnetic core of fig. 1 to 11 in the above embodiment and any combination of technical solutions in the above magnetic core.
An embodiment of the utility model provides a circuit board, including foretell magnetism integrated device. Because the magnetic core that magnetism integrated device adopted in the circuit board adopts upper and lower two-layer integrated structure, including first magnetic core subassembly 110 and second magnetic core subassembly 120, supply first winding 1230 and second winding 1240 to wind respectively and establish, realized that the magnetism device that will originally separate is integrated together, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. The second magnetic core assembly 120 includes the first magnetic core portion 130, the shape of the first magnetic core portion 130 is a closed continuous ring, which forms a closed magnetic circuit for the lower layer winding, in addition, the first arm portion 131 on the upper side of the first magnetic core portion and the first magnetic core assembly 110 form a first closed magnetic circuit for the upper layer winding, and thus, the first arm portion 131 is respectively shared by the upper and lower layers of closed magnetic circuits, so that the volumes of the magnetic core and the magnetic integrated device can be further reduced, and the wiring design of the circuit board is facilitated. Meanwhile, in order to avoid saturation of the magnetic core when the magnetic device used as an energy storage or filtering device is used, the first magnetic core assembly 110 or the second magnetic core assembly 120 is provided with the second magnetic core part 140, the second magnetic core part 140 comprises a plurality of sections of first cores 141, and a first air gap 142 is arranged between the adjacent cores, and the second magnetic core part 140 comprises a plurality of air gaps, so that the distance between the first air gaps 142 can be made small, and the eddy current loss of the magnetic integrated device and the magnetic interference on the periphery of the magnetic core can be reduced while the performance of the magnetic integrated device is maintained to be the same as that of a single air gap with a large distance.
An embodiment of the utility model provides a household appliance, including foretell circuit board, wherein household appliance can be the air conditioner. Because the circuit in the circuit board adopts the magnetism integrated device, and the magnetic core in the magnetism integrated device includes first magnetic core subassembly 110 and second magnetic core subassembly 120, supplies first winding and second winding to wind respectively and establishes, has realized that the magnetism device that originally separates is integrated together, can effectively reduce the volume of magnetic core and magnetism integrated device, reduction in production cost. The second magnetic core assembly 120 includes a first magnetic core portion 130, the shape of the first magnetic core portion 130 is a closed continuous ring shape, and a closed magnetic circuit used by a lower layer winding is formed, and in addition, the first arm portion 131 on the upper side of the first magnetic core portion and the first magnetic core assembly 110 form a first closed magnetic circuit used by an upper layer winding. Meanwhile, in order to avoid saturation of the magnetic core when the magnetic device used as an energy storage or filtering device is used, the first magnetic core assembly 110 or the second magnetic core assembly 120 is provided with the second magnetic core part 140, the second magnetic core part 140 comprises a plurality of sections of first cores 141, and a first air gap 142 is arranged between the adjacent cores, and the second magnetic core part 140 comprises a plurality of air gaps, so that the distance between the first air gaps 142 can be made small, and the eddy current loss of the magnetic integrated device and the magnetic interference on the periphery of the magnetic core can be reduced while the performance of the magnetic integrated device is maintained to be the same as that of a single air gap with a large distance.
It should also be appreciated that the various embodiments provided by the embodiments of the present invention can be combined arbitrarily to achieve different technical effects.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (18)
1. A magnetic core, comprising:
a first magnetic core assembly;
a second magnetic core assembly located below the first magnetic core assembly, the second magnetic core assembly including a first magnetic core portion having a shape of a closed continuous loop, the first magnetic core portion including a first arm portion near an upper side of the first magnetic core assembly, the first arm portion and the first magnetic core assembly constituting a first closed magnetic path;
the second magnetic core part is arranged on the first magnetic core assembly or the second magnetic core assembly and comprises multiple sections of first cores, and a first air gap is arranged between every two adjacent cores.
2. A magnetic core according to claim 1, wherein the first magnetic core assembly comprises a second arm portion and folded arms provided at both ends of the second arm portion, the folded arms at both ends of the first arm portion, the second arm portion and the second arm portion constituting the first closed magnetic circuit.
3. A magnetic core according to claim 2, wherein said second core portion is provided on any one of the sections of said first core assembly in said first closed magnetic circuit.
4. A magnetic core according to claim 2, wherein said second core portion is provided on one of said folded arms of said first core assembly.
5. A magnetic core according to claim 2, comprising two of said second core portions, said two second core portions being respectively provided on said folded arms at both ends of said second arm portion.
6. A magnetic core according to any of claims 1 to 5, characterized in that the second magnetic core assembly further comprises a third magnetic core part, which is arranged in the middle of the first magnetic core part.
7. A magnetic core according to claim 6, characterized in that the lower side of the first core portion remote from the first core assembly comprises a third arm portion, the third core portion being connected to the first arm portion and the third arm portion, respectively.
8. A magnetic core according to claim 6, wherein the lower side of the first core portion remote from the first core assembly comprises a third arm portion, one end of the third core portion being connected to the third arm portion, and the other end of the third core portion forming a second air gap with the first arm portion.
9. A magnetic core according to claim 2, wherein said second core portion is disposed between said first arm portion and said second arm portion.
10. A magnetic core according to claim 2, wherein a third air gap is formed between the folded arms at the two ends of the second arm portion and the first arm portion.
11. A magnetic core according to claim 1, wherein the underside of the first core portion remote from the first core assembly comprises a third arm portion, the second core portion being disposed between the first arm portion and the third arm portion.
12. A magnetic core according to claim 11, further comprising a fourth core portion disposed on said first core assembly, said fourth core portion comprising a plurality of segments of second cores, wherein a fourth air gap is disposed between adjacent ones of said second cores.
13. A magnetic core according to claim 11, further comprising a fourth core portion, wherein the first core assembly comprises a second arm portion and folded arms disposed at both ends of the second arm portion, and wherein the fourth core portion is disposed between the first arm portion and the second arm portion.
14. A magnetic core according to claim 1, wherein said first air gap is filled with a non-magnetically conductive material.
15. A magnetic core according to any one of claims 2 to 5 and 9 to 13, wherein the folded arms at the two ends of the first arm portion, the second arm portion and the second arm portion close to form a first annular opening, and the first magnetic core portion having a ring shape comprises a second annular opening, the area of the first annular opening is half of the area of the second annular opening.
16. A magnetically integrated device comprising a magnetic core as claimed in any one of claims 1 to 14 and first and second windings, the first winding being wound around a first core component of the magnetic core and the second winding being wound around a second core component of the magnetic core.
17. A wiring board comprising the magnetically integrated device of claim 15.
18. A household appliance comprising the wiring board of claim 16.
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| CN202022319679.4U CN213400745U (en) | 2020-10-16 | 2020-10-16 | Magnetic core, magnetic integrated device and circuit board, domestic appliance thereof |
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| CN202022319679.4U CN213400745U (en) | 2020-10-16 | 2020-10-16 | Magnetic core, magnetic integrated device and circuit board, domestic appliance thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115762959A (en) * | 2022-11-10 | 2023-03-07 | 超聚变数字技术有限公司 | Inductor, power factor correction circuit, switching power supply and computing equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115762959A (en) * | 2022-11-10 | 2023-03-07 | 超聚变数字技术有限公司 | Inductor, power factor correction circuit, switching power supply and computing equipment |
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