Magnetic assembly and switching power supply

Abstract

The utility model provides a magnetic assembly and a switching power supply. The magnetic assembly comprises a framework, a winding, a magnetic sheet and two magnetic cores which are oppositely arranged, the magnetic core comprises a cover plate, a wrapping post and at least one public post, and one end of the wrapping post and one end of the public post are connected with the cover plate; the winding comprises a primary winding and a secondary winding, and the primary winding and the secondary winding are arranged on the framework in a sleeving manner; the winding post is sleeved with the framework, a separation part is arranged on the peripheral face of the framework in a protruding mode, the primary winding and the secondary winding are separated by the separation part, an installation notch is formed in the separation part, and the magnetic sheet is arranged in the installation notch. The primary winding and the secondary winding of the magnetic assembly are separated by the separation part and the magnetic sheet, the arrangement of the magnetic sheet is beneficial to adjusting the size of leakage inductance (namely leakage inductance) of the magnetic assembly, when the magnetic assembly is applied to a switching power supply, a resonant inductor does not need to be additionally arranged, the distance between the primary winding and the secondary winding does not need to be increased, and the magnetic assembly is simple in structure and convenient to use. Therefore, no volume burden is brought to the switching power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a magnetic assembly and a switching power supply. BACKGROUND

[0002] The resonant circuit structure in the switching power supply (such as an on-board charger) usually adopts the mode of working with two magnetic components of transformer and resonant inductor. The number of magnetic components is too large in this scheme, resulting in high cost of the switching power supply. Therefore, the related technology has developed a scheme of integrating leakage inductance, which adjusts the leakage inductance to the inductance of the required resonant inductor by increasing the leakage inductance of the transformer, so that the resonant inductor is saved, that is, only one magnetic component can achieve the effect of the original two magnetic components.

[0003] At present, the main way to increase the leakage inductance of the transformer is to simply increase the distance between the primary winding and the secondary winding of the transformer. For this way, when a relatively large leakage inductance value is required, the distance between the primary winding and the secondary winding needs to be made relatively large, which will result in a large volume of the entire transformer, which is not conducive to the improvement of the power density of the switching power supply. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a magnetic assembly and a switching power supply to at least partially solve the above technical problems.

[0005] In a first aspect, embodiments of the present application provide a magnetic assembly, comprising: a framework, a winding, a magnetic sheet, and two oppositely arranged magnetic cores.

[0006] The magnetic core comprises a cover plate, a winding column and a common column, one end of the winding column and the common column is connected with the cover plate, and the number of the common column is at least one;

[0007] The winding comprises a primary winding and a secondary winding, and the primary winding and the secondary winding are sleeved on the framework;

[0008] The framework is sleeved on the winding column, the outer peripheral surface of the framework is provided with a separation part, the separation part separates the primary winding and the secondary winding, the separation part is provided with a mounting gap, and the magnetic sheet is arranged in the mounting gap.

[0009] In some embodiments, the separation part extends along the circumference of the framework, the number of the separation part is at least one, and at least one mounting gap is arranged on each separation part.

[0010] In some embodiments, along the radial direction of the framework, the width of the mounting gap gradually increases, and the magnetic sheet is matched with the mounting gap. In some embodiments, the number of the separation part is a plurality, and the plurality of separation parts are distributed in the axial direction of the framework.

[0011] In some embodiments, the skeleton is a cylinder, a hollow channel is arranged through the cylinder, and the bobbin is accommodated in the hollow channel.

[0012] In some embodiments, a heat dissipation groove is arranged on the magnetic core, the heat dissipation groove is recessed from the surface of the magnetic core to the inside of the magnetic core, the heat dissipation groove extends along the axial direction of the bobbin and penetrates the bobbin and the cover plate, and a heat dissipation channel is formed between the heat dissipation groove and the cylinder.

[0013] In some embodiments, the skeleton further comprises two limiting protrusions arranged at two ends of the skeleton respectively, the winding is located between the two limiting protrusions, and the limiting protrusions are used for limiting the position of the winding on the skeleton; and the partition is arranged between the two limiting protrusions.

[0014] In some embodiments, the magnetic sheet and the partition are connected by bonding, clamping or one-piece injection molding.

[0015] In some embodiments, the relative magnetic permeability of the magnetic sheet is greater than 1000.

[0016] In some embodiments, the skeleton and the partition are one-piece.

[0017] In some embodiments, the winding is a line cake structure. In a second aspect, the embodiments of the present application provide a switching power supply comprising the magnetic assembly described above.

[0018] The embodiments of the present application have the following beneficial effects:

[0019] The magnetic assembly provided by the embodiments of the present application has the following advantages. The skeleton is provided with a protrusion on the outer circumferential surface, and the primary winding and the secondary winding are arranged on the two sides of the protrusion and separated by the protrusion. The mounting gap is further formed on the protrusion, and the magnetic sheet is arranged in the mounting gap. The primary winding and the secondary winding are further separated by the magnetic sheet. The size of the leakage inductance of the magnetic assembly can be adjusted by the magnetic sheet. Specifically, the primary winding and the magnetic sheet form a semi-closed magnetic loop, and the secondary winding and the magnetic sheet form a semi-closed magnetic loop. Compared with the case without the magnetic sheet, the magnetic path length is reduced by half, the magnetic path length is shortened, the inductance of the primary winding and the secondary winding is increased, and thus the leakage inductance of the primary winding and the secondary winding is increased. The adjusted leakage inductance can be used as a resonance inductance. Therefore, when the magnetic assembly is applied to a switching power supply, the switching power supply does not need to additionally and separately arrange a resonance inductance, and the magnetic assembly does not need to increase the distance between the primary winding and the secondary winding, thereby reducing the overall size of the switching power supply and improving the power density of the switching power supply. In addition, since the magnetic sheet is arranged in the mounting gap on the protrusion, the installation of the magnetic sheet does not need to further increase the distance between the primary winding and the secondary winding, and thus the magnetic assembly does not have a volume burden.

[0020] In addition, due to the arrangement of the mounting gap, the thickness, material and quantity of the magnetic sheet arranged in the mounting gap can be selected according to the different requirements of different switching power supplies for the size of the leakage inductance during the design of the magnetic assembly, thereby reducing the design difficulty of the magnetic assembly, and the skeletons can be shared between different magnetic assemblies, thereby reducing the cost of mold development and the production cost of the switching power supply. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a perspective view of a first magnetic assembly provided by the embodiments of the present application, and the winding is omitted in the figure;

[0023] Figure 2 is an exploded view of the magnetic assembly in Figure 1 ;

[0024] Figure 3 is a cross-sectional structure schematic view of a second magnetic assembly provided by the embodiments of the present application;

[0025] Figure 4 is an exploded view of a third magnetic assembly provided by the embodiments of the present application;

[0026] Figure 5 is a cross-sectional structure schematic diagram of a fourth magnetic assembly provided by an embodiment of the present application;

[0027] Figure 6 is a cross-sectional structure schematic diagram of a fifth magnetic assembly provided by an embodiment of the present application.

[0028] Reference signs:

[0029] 10, magnetic assembly;

[0030] 1, skeleton; 101, cylinder; 102, hollow channel;

[0031] 11, partition;

[0032] 12, mounting notch;

[0033] 13, limiting protrusion; 131, limiting matching part;

[0034] 2, winding;

[0035] 21, primary winding;

[0036] 22, secondary winding;

[0037] 3, magnetic sheet;

[0038] 4, magnetic core; 401, first magnetic core; 402, second magnetic core;

[0039] 41, winding post;

[0040] 42, cover plate;

[0041] 43, common post;

[0042] 411, heat dissipation groove. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] In addition, it should be understood that the specific embodiments described herein are merely used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0045] The terms "first", "second", "third", etc. are used only to describe different instances, and cannot be construed to refer to a relative importance or to imply that the indicated technical features are of a certain number. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0046] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] The terms "including", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0048] In the description of the embodiments of the present application, the words "example" or "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The words "example" or "for example" are intended to present relative concepts in a clear manner.

[0049] In order to facilitate the understanding of the scheme of the present application, the spline curves and arrows used in the labels in the drawings are described as follows: the components indicated by the spline curves without arrows are solid components, i.e. components with solid structures; the components indicated by the spline curves with arrows are virtual components, i.e. components without solid structures.

[0050] In a first aspect, the embodiments of the present application provide a magnetic assembly, which can be used in a switching power supply, and the magnetic assembly can be a transformer.

[0051] Specifically, please refer to Figures 1 to 6The magnetic assembly 10 comprises a skeleton 1, a winding 2, a magnetic sheet 3 and a magnetic core 4. The winding 2 and the magnetic sheet 3 are arranged on the skeleton 1, and the skeleton 1 is arranged on the magnetic core 4. The magnetic core 4 comprises two magnetic cores 4 arranged oppositely.

[0052] The magnetic core 4 is a magnetic circuit part in the magnetic assembly 10. The magnetic core 4 comprises a winding column 41, a cover plate 42 and a common column 43. The winding column 41 and the common column 43 are connected to the cover plate 42 at one end. The common column 43 is at least one. The skeleton 1 is arranged on the magnetic core 4, specifically, the skeleton 1 is sleeved on the winding column 41.

[0053] For the sake of distinction, please refer to Figure 3 and Figure 6 The two magnetic cores 4 are referred to as a first magnetic core 401 and a second magnetic core 402, and the first magnetic core 401 and the second magnetic core 402 are arranged oppositely. Specifically, the first magnetic core 401 and the second magnetic core 402 face each other, and the winding columns 41 on the first magnetic core 401 and the second magnetic core 402 are connected to each other, and the common columns 43 on the first magnetic core 401 and the second magnetic core 402 are connected to each other. The winding columns 41 on the first magnetic core 401 and the second magnetic core 402 are connected to each other, that is, the free end of the winding column 41 on the first magnetic core 401 (i.e. the end away from the cover plate 42) is connected to the free end of the winding column 41 on the second magnetic core 402, and the common columns 43 on the first magnetic core 401 and the second magnetic core 402 are connected to each other, that is, the free end of the common column 43 on the first magnetic core 401 (i.e. the end away from the cover plate 42) is connected to the free end of the common column 43 on the second magnetic core 402. By arranging the two magnetic cores 4 oppositely, the magnetic circuit can be closed.

[0054] The winding column 41 and the common column 43 are connected to the cover plate 42 at one end, that is, one end of the winding column 41 is connected to the cover plate 42, and one end of the common column 43 is also connected to the cover plate 42. The winding column 41 and the common column 43 are vertically arranged on the same side surface of the cover plate 42. Alternatively, the winding column 41, the cover plate 42 and the common column 43 are integrally formed.

[0055] Generally, the number of winding columns 41 and cover plates 42 in a single magnetic core 4 is 1 respectively, and the number of common columns 43 can be one or two.

[0056] As an example, please refer to Figure 2 The magnetic core 4 is in the shape of E. In detail, the number of cover plates 42 and winding columns 41 is 1 respectively, and the number of common columns 43 is two. The two common columns 43 and the winding column 41 are vertically arranged on the same side surface of the cover plate 42, and the winding column 41 is vertically arranged between the two common columns 43. The advantage of such an arrangement is that the magnetic core 4 has high mechanical strength. When the skeleton 1 is sleeved on the winding column 41, the skeleton 1 is located between the common column 43 and the winding column 41.

[0057] As an example, see Figure 4 The magnetic core 4 is in the shape of a U. The number of the cover plate 42, the common column 43 and the winding column 41 is one, wherein the common column 43 and the winding column 41 are erected on the same side surface of the cover plate 42.

[0058] The winding 2 is the circuit part in the magnetic assembly 10. The winding 2 comprises a primary winding 21 and a secondary winding 22. The winding 2 is arranged on the skeleton 1, specifically the primary winding 21 and the secondary winding 22 are sleeved on the skeleton 1. It can be understood that the skeleton 1 is located between the winding 2 and the winding column 41. It should be noted that in the magnetic assembly 10, the number of the primary winding 21 can be one or more, and the number of the secondary winding 22 can also be one or more.

[0059] The winding 2 comprises at least one coil. The primary winding 21 is also called the primary coil, and the secondary winding 22 is also called the secondary coil. When the primary winding 21 is connected to alternating current, the primary winding 21 will generate an alternating magnetic field in the magnetic core 4, and then generate an induced electromotive force in the secondary winding 22. The ratio of the number of turns between the primary winding 21 and the secondary winding 22 in the magnetic assembly 10 is equal to the voltage ratio. By changing the number of turns of the primary winding 21 and the secondary winding 22, the ratio of the electromotive force of the primary winding 21 and the secondary winding 22 can be changed, so as to achieve the purpose of changing the voltage. It can be understood that since the magnetic assembly 10 is a transformer, if the number of turns of the primary winding 21 is more than that of the secondary winding 22, the transformer can realize step-down; on the contrary, if the number of turns of the primary winding 21 is less than that of the secondary winding 22, the transformer can realize step-up.

[0060] The skeleton 1 is an insulating structural member that is neither conductive nor magnetic. As an example, the skeleton 1 is a plastic part, so that the skeleton 1 is not only light in quality but also easy to be prepared by injection molding, low in cost.

[0061] The skeleton 1 is provided with a partition 11. Specifically, the partition 11 is protruded on the outer circumferential surface of the skeleton 1. That is to say, the partition 11 is located on the outer circumferential surface of the skeleton 1 and protrudes relative to the outer circumferential surface of the skeleton 1. Here, the outer circumferential surface of the skeleton 1 is the outer surface of the skeleton 1. The primary winding 21 and the secondary winding 22 are wound on the outer circumferential surface of the skeleton 1, and the primary winding 21 and the secondary winding 22 are respectively located on the two sides of the partition 11, and the partition 11 separates the primary winding 21 and the secondary winding 22 in the winding 2. That is, the partition 11 is located between the primary winding 21 and the secondary winding 22, and the partition 11 separates the primary winding 21 and the secondary winding 22.

[0062] In addition, the partition 11 is also provided with a mounting gap 12. The magnetic sheet 3 is arranged on the skeleton 1, specifically the magnetic sheet 3 is mounted in the mounting gap 12. Similarly, the magnetic sheet 3 is also located between the primary winding 21 and the secondary winding 22.

[0063] The magnetic assembly 10 provided by the embodiments of the present application has the following advantages. The skeleton 1 has a peripheral surface, and the primary winding 21 and the secondary winding 22 are arranged on two sides of the partition 11 and separated by the partition 11. The partition 11 further has a mounting gap 12, and the magnetic sheet 3 is arranged in the mounting gap 12. In this way, the primary winding 21 and the secondary winding 22 are further separated by the magnetic sheet 3, and the leakage inductance of the magnetic assembly 10 can be adjusted by adjusting the magnetic sheet 3. Specifically, the primary winding 21 and the magnetic sheet 3 form a semi-closed magnetic loop, and the secondary winding 22 and the magnetic sheet 3 form a semi-closed magnetic loop. Compared with the case without the magnetic sheet 3, the magnetic path length is reduced by half, the magnetic path length is shortened, the inductance of the primary winding 21 and the secondary winding 22 is increased, and thus the leakage inductance of the primary winding 21 and the secondary winding 22 is increased. The adjusted leakage inductance can be used as a resonance inductance. Therefore, when the magnetic assembly 10 is applied to a switching power supply, the switching power supply does not need to additionally and separately arrange a resonance inductance, and the magnetic assembly 10 does not need to increase the distance between the primary winding 21 and the secondary winding 22, thereby reducing the overall size of the switching power supply and improving the power density of the switching power supply. In addition, since the magnetic sheet 3 is arranged in the mounting gap 12 of the partition 11, the installation of the magnetic sheet 3 does not need to further increase the distance between the primary winding 21 and the secondary winding 22, and thus the magnetic assembly 10 does not have a volume burden.

[0064] In addition, due to the arrangement of the mounting gap 12, during the design of the magnetic assembly 10, the thickness, material, and number of the magnetic sheet 3 arranged in the mounting gap 12 can be selected according to the different requirements of different switching power supplies for the size of the leakage inductance, thereby reducing the design difficulty of the magnetic assembly 10, and different magnetic assemblies 10 can share the skeleton 1, thereby reducing the cost of mold development and the production cost of the switching power supply.

[0065] In some embodiments, the winding 21 has a wire cake structure. The winding 21 is designed as a wire cake structure, which can facilitate the rapid sleeving of the winding 2 on the skeleton 1 and improve the assembly efficiency of the magnetic assembly 10.

[0066] In some embodiments, the winding 21 can be made of an enameled wire or a copper wire. As an example, the conductive part of the winding 21 is a multi-strand enameled wire, and the winding 21 further has an insulating layer on the outside.

[0067] In some embodiments, the relative magnetic permeability of the magnetic sheet 3 is greater than 1000. By increasing the relative magnetic permeability of the magnetic sheet 3, the thickness of the magnetic sheet 3 can be reduced, the length of the magnetic assembly 10 can be shortened, and thus the volume of the switching power supply can be reduced and the power density of the switching power supply can be improved. For example, the relative magnetic permeability of the magnetic sheet 3 can be 1000, 2000, 3000, 4000, 5000, 6000, 8000, or 10000.

[0068] In some embodiments, the skeleton 1 and the partition 11 are integrally formed, so that the connection stability between the skeleton 1 and the partition 11 can be ensured, and the risk of displacement of the partition 11 relative to the skeleton 1 can be reduced, so that the distance between the primary winding 21, the magnetic sheet 3, and the secondary winding 22 is not easily changed, and thus the stability of the leakage inductance value can be ensured. For example, when the skeleton 1 is a plastic part, the skeleton 1 and the partition 11 are integrally injection molded during the injection molding process of the skeleton 1.

[0069] In some embodiments, the partition 11 extends along the circumference of the skeleton 1, the number of partitions 11 is at least one, and at least one mounting gap 12 is provided on each partition 11. Generally, the primary winding 21 and the secondary winding 22 are sleeved on the skeleton 1, and by arranging the partition 11 to extend along the circumference of the skeleton 1, the partition 11 can better separate the primary winding 21 and the secondary winding 22, and the mounting gap 12 is provided on each partition 11, so that the magnetic sheet 3 is mounted in the mounting gap 12, and the primary winding 21 and the secondary winding 22 are also separated by the magnetic sheet 3.

[0070] It can be understood that the depth of the mounting gap 12 can be less than the height of the partition 11, or can be equal to the height of the partition 11.

[0071] The number of mounting gaps 12 in a single partition 11 can be one or more. Alternatively, the partition 11 is arranged around the skeleton 1, the number of mounting gaps 12 in a single partition 11 is more than one, and the plurality of mounting gaps 12 are distributed along the circumference of the skeleton 1. By arranging a plurality of mounting gaps 12, the magnetic sheet 3 can be more flexibly arranged when designing the magnetic assembly 10, and the leakage inductance value of the magnetic assembly 10 can be more flexibly adjusted.

[0072] Generally, the number of partitions 11 in the skeleton 1 can be one or more.

[0073] In some embodiments, the number of partitions 11 is multiple, and the multiple partitions 11 are spaced along the axial direction of the skeleton 1. By providing multiple partitions 11, not only can the leakage inductance of the magnetic assembly 10 be adjusted, but also the structure of the magnetic assembly 10 can be made more abundant. When the number of partitions 11 is multiple, the number of at least one of the primary winding 21 and the secondary winding 22 is also multiple, and the primary winding 21 and the secondary winding 22 are respectively arranged on both sides of the partition 11. As an example, please refer to Figure 3 and Figure 4 , the number of partitions 11 is two, and the number of primary windings 21 is two and the number of secondary windings 22 is one. As an example, please refer to Figure 6 , the number of partitions 11 on the skeleton 1 is four, and the number of primary windings 21 is four and the number of secondary windings 22 is two. It can be understood that in the magnetic assembly 10, at least one pair of adjacent primary windings 21 and secondary windings 22 is separated by a partition 11.

[0074] In some embodiments, please refer to Figure 5 , the width of the mounting gap 12 gradually increases in the radial direction of the skeleton 1, and the magnetic sheet 3 is matched with the mounting gap 12. That is, the mounting gap 12 is shaped like a wide mouth and a narrow bottom, which facilitates the installation of the magnetic sheet 3 in the mounting gap 12. Please continue to refer to Figure 5 , in which the mounting gap 12 can be trapezoidal or sector-shaped, and correspondingly, the magnetic sheet 3 is also trapezoidal or sector-shaped.

[0075] In addition to being used for mounting the winding 2 and the magnetic sheet 3, the skeleton 1 is also used for mounting the magnetic core 4. The magnetic core 4 is the main magnetic circuit part in the magnetic assembly 10. The magnetic core 4 and the magnetic sheet 3 are both structural parts made of magnetic material, but the magnetic core 4 and the magnetic sheet 3 can be made of the same kind of magnetic material or different kinds of magnetic material.

[0076] When the magnetic sheet 3 is installed in the mounting gap 12, the magnetic sheet 3 is connected with the partition 11. Optionally, the magnetic sheet 3 and the partition 11 can be detachably connected or fixedly connected. Optionally, the magnetic sheet 3 and the partition 11 can be bonded, clamped, or integrally injection molded together. In the case of integrally injection molding between the magnetic sheet 3 and the partition 11, the partition 11 is usually an injection molded plastic part.

[0077] In some embodiments, when the depth of the mounting gap 12 is equal to the height of the partition 11, the magnetic sheet 3 can also be connected with the skeleton 1. Optionally, the magnetic sheet 3 and the skeleton 1 can be bonded, clamped, or integrally injection molded together.

[0078] In some embodiments, please refer to Figure 2 and Figure 4, the skeleton 1 is a cylinder 101, a hollow channel 102 is arranged through the cylinder 101, and the hollow channel 102 is used for accommodating the magnetic core 4. In detail, the magnetic core 4 includes a winding column 41, the winding column 41 extends into the hollow channel 102, that is, the winding column 41 is accommodated in the hollow channel 102. Optionally, the winding column 41 is matched with the hollow channel 102, so that the cylinder 101 can also limit the winding column 41, and the stability of cooperation between the skeleton 1 and the magnetic core 4 is improved.

[0079] In some embodiments, in order to facilitate heat dissipation, the magnetic core 4 is further provided with a heat dissipation groove 411, the heat dissipation groove 411 is recessed from the surface of the magnetic core 4 to the inside of the magnetic core 4, and the heat dissipation groove 411 extends along the axial direction of the winding column 41 and penetrates the winding column 41 and the cover plate 42. The number of heat dissipation grooves 411 can be one or more. The skeleton 1 is a cylinder 101, the winding column 41 extends into the hollow channel 102, and the cylinder 101 covers one side opening of the heat dissipation groove 411, so that the heat dissipation groove 411 is formed as a heat dissipation channel. The heat generated by the magnetic assembly 10 during operation can be dissipated through the heat dissipation channel, and the temperature rise of the magnetic assembly 10 is reduced.

[0080] In some embodiments, referring to Figures 2 to 4 , the skeleton 1 further includes a limiting protrusion 13, the limiting protrusion 13 is located at the end of the skeleton 1, the limiting protrusion 13 is used for limiting the position of the winding 2 on the skeleton 1, so as to prevent the winding 2 from being separated from the skeleton 1, and the structural stability of the magnetic assembly 10 is improved.

[0081] In some embodiments, referring to Figures 2 to 4 , the skeleton 1 further includes a limiting protrusion 13, the number of limiting protrusions 13 is two, the two limiting protrusions 13 are respectively arranged at the two ends of the skeleton 1, the winding 2 and the separation part 11 are located between the two limiting protrusions 13, and the limiting protrusion 13 is used for limiting the position of the winding 2 on the skeleton 1, so as to prevent the winding 2 from being separated from the skeleton 1. The limiting protrusion 13 can be matched with the separation part 11 to limit the winding 2.

[0082] In some embodiments, the number of separation parts 11 is at least two, in the direction from one end of the skeleton 1 to the other end, the primary winding 21 and the secondary winding 22 are alternately distributed on the outer circumferential surface of the skeleton 1, and adjacent primary windings 21 and secondary windings 22 are located on the two sides of a separation part 11. As an example, the number of separation parts 11 is two, in the direction from one end of the skeleton 1 to the other end, the limiting protrusion 13, the separation part 11, the separation part 11, and the limiting protrusion 13 are sequentially arranged, wherein the number of primary windings 21 is two, the primary windings 21 are installed between the separation part 11 and the limiting protrusion 13, the number of secondary windings 22 is one, and the secondary winding 22 is installed between the two separation parts 11.

[0083] In some embodiments, a limiting fitting part 131 is further arranged on the limiting protrusion 13, the limiting fitting part 131 protrudes from the limiting protrusion 13 and extends along the axial direction of the skeleton 1, and the limiting fitting part 131 is used for cooperating with the magnetic core 4 to limit the skeleton 1.

[0084] In the second aspect, the embodiments of the present application further provide a switching power supply, which comprises the aforementioned magnetic assembly 10.

[0085] In some embodiments, the switching power supply comprises a charger. As an example, the charger is a vehicle charger.

[0086] The above has introduced the embodiments of the present application in detail, and the specific examples are applied to describe the principles and the embodiments of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for the skilled in the art, according to the idea of the present application, the specific embodiments and the application range can be changed, and the above description of the present application should not be understood as the limitation of the present application.

Claims

1. A magnetic assembly, characterized by The magnetic assembly comprises a skeleton, a winding, a magnetic sheet and two oppositely arranged magnetic cores. The magnetic core comprises a cover plate, winding columns and a common column, one end of the winding columns and the common column is connected with the cover plate, and the number of the common column is at least one. The winding comprises a primary winding and a secondary winding, and the primary winding and the secondary winding are sleeved on the skeleton. The skeleton is sleeved on the winding column, and the outer circumferential surface of the skeleton is provided with a separation part, the separation part separates the primary winding and the secondary winding, and the separation part is provided with a mounting gap, and the magnetic sheet is arranged in the mounting gap. The separation part extends along the circumference of the skeleton, and the number of the separation part is at least one, and at least one mounting gap is arranged on each separation part.

2. The magnetic assembly of claim 1, wherein, Along the radial direction of the skeleton, the width of the mounting gap gradually increases, and the magnetic sheet is matched with the mounting gap; and / or the number of the separation part is multiple, and the multiple separation parts are distributed along the axial direction of the skeleton.

3. The magnetic assembly of claim 2, wherein, The skeleton is a cylinder, a hollow channel is arranged in the cylinder, and the winding column is accommodated in the hollow channel.

4. The magnetic assembly of claim 2, wherein, The magnetic core is provided with a heat dissipation groove, the heat dissipation groove is recessed from the surface of the magnetic core to the inside of the magnetic core, and the heat dissipation groove extends along the axial direction of the winding column and penetrates the winding column and the cover plate, and the heat dissipation groove and the cylinder form a heat dissipation channel.

5. The magnetic assembly of claim 4, wherein, The skeleton further comprises two limiting protrusions arranged at two ends of the skeleton respectively, the winding is located between the two limiting protrusions, and the limiting protrusions are used for limiting the position of the winding on the skeleton; and the separation part is arranged between the two limiting protrusions.

6. The magnetic assembly of claim 2, wherein, The skeleton and the separation part are integrally formed; and / or the winding is a wire cake structure.

7. The magnetic assembly of claim 2, wherein, The magnetic sheet and the separation part are connected by bonding, clamping or integrally injection molding.

8. The magnetic assembly of any of claims 1-7, wherein, The relative magnetic permeability of the magnetic sheet is greater than 1000.

9. The magnetic assembly of claim 8, wherein, The magnetic assembly comprises a magnetic assembly as claimed in any one of claims 1-9.

10. A switching power supply, characterized by comprising: The magnetic assembly comprises a magnetic assembly as claimed in any one of claims 1-9.

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