Magnetic assembly and switching power supply

Abstract

The invention provides a magnetic assembly and a switching power supply. The magnetic assembly comprises a magnetic core and a winding. The magnetic core comprises two oppositely arranged main magnetic cores and at least one sub-magnetic core, and the sub-magnetic core is arranged between the main magnetic cores; the main magnetic core comprises a main cover plate, a main wrapping post and at least one public post, one end of the main wrapping post and one end of the public post are connected with the main cover plate; each sub magnetic core comprises a sub cover plate and a sub wrapping post of which one end is connected with the sub cover plate; the winding is arranged on the main winding post and the sub winding post and comprises a primary winding and a secondary winding; and the sub-cover plates are used for separating the primary winding from the secondary winding. Therefore, the leakage inductance of the magnetic assembly can be accurately adjusted, the size of the switching power supply is controlled, and the power density of the switching power supply is improved.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a magnetic component and a switching power supply. Background Art

[0002] The resonant circuit structure in a switching power supply (such as an on-board charger) usually works by combining two magnetic components, a transformer and a resonant inductor. The excessive number of magnetic components in this solution leads to a high cost of the switching power supply. To this end, the relevant technology has developed a leakage inductance integration solution, which increases the leakage inductance of the transformer and adjusts the leakage inductance to the required resonant inductance. In this way, the resonant inductor is omitted, that is, only one magnetic component is needed to achieve the effect of the original two magnetic components.

[0003] At present, there are two main ways to increase the leakage inductance of the transformer: one is to simply increase the distance between the primary winding and the secondary winding of the transformer; the other is to insert a magnetic sheet between the primary winding and the secondary winding of the transformer. For the first method, 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 cause the volume of the entire transformer to become larger, which is not conducive to the improvement of the power density of the switching power supply. For the second method, the leakage inductance value of the transformer is difficult to control accurately. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present application provides a magnetic component, including a magnetic core and a winding;

[0006] The magnetic core comprises two oppositely arranged main magnetic cores and at least one sub-magnetic core, wherein the sub-magnetic core is arranged between the main magnetic cores;

[0007] The main magnetic core comprises a main cover plate, a main winding column and a common column, one end of the main winding column and the common column are connected to the main cover plate, and the number of the common column is at least one;

[0008] The sub-magnetic core comprises a sub-cover plate and a sub-winding column with one end connected to the sub-cover plate;

[0009] The winding is arranged on the main winding pole and the sub-winding pole, and the winding includes a primary winding and a secondary winding; the sub-cover is used to separate the primary winding from the secondary winding.

[0010] In some embodiments, the sub-cover plate is configured to at least partially protrude from the sub-winding post along the radial direction of the sub-winding post; and the cross-sectional area of ​​the main winding post is the same as the cross-sectional area of ​​the sub-winding post.

[0011] In some embodiments, the sub-magnetic core is a T-shaped magnetic core, and the sub-cover plate and the sub-winding column are integrally formed.

[0012] In some embodiments, the number of the sub-magnetic cores is greater than 1, all the sub-magnetic cores are spliced ​​in sequence, and the sub-cover plate is located between two adjacent primary windings and the secondary windings.

[0013] In some embodiments, the magnetic assembly includes at least two adjacent sub-magnetic cores disposed opposite to or away from each other.

[0014] In some embodiments, the number of the sub-magnetic cores is 2n, where n≥1, and the two sub-magnetic cores located in the middle are arranged opposite to or back to each other.

[0015] In some embodiments, when n=1, and the two sub-cores are arranged opposite to each other, the number of the primary winding and the number of the secondary winding are 2 each; the primary winding and the secondary winding are arranged alternately; or, the primary windings are all arranged on the main winding pole, and the secondary windings are all arranged on the sub-winding pole; or, the primary windings are all arranged on the sub-winding pole, and the secondary windings are all arranged on the main winding pole.

[0016] In some embodiments, the sub-magnetic core and the main magnetic core, as well as two adjacent sub-magnetic cores, are bonded together.

[0017] In some embodiments, the winding is a coil structure, the sub-core is located between the main winding posts of the two oppositely disposed main cores, and the total length of the main winding posts and the sub-core is equal to the total length of the common post.

[0018] In a second aspect, an embodiment of the present application provides a switching power supply, comprising the aforementioned magnetic component.

[0019] Beneficial effects of the embodiments of the present application:

[0020] The magnetic component provided in the embodiment of the present application is configured to include an independent main magnetic core and a sub-magnetic core, the primary winding and the secondary winding of the winding are installed on the main winding post of the main magnetic core and the sub-winding post of the sub-magnetic core, and the sub-cover plate connected to the sub-winding post in the sub-magnetic core separates the primary winding and the secondary winding, so that the sub-cover plate and the primary winding located on one side thereof form a semi-closed magnetic circuit, and the sub-cover plate and the secondary winding located on the other side thereof form a semi-closed magnetic circuit, compared with the case where the sub-cover plate is not provided on the sub-winding post, the length of the magnetic circuit is reduced by half, the length of the magnetic circuit is shortened, the inductance of the primary winding and the secondary winding is increased, thereby increasing the leakage inductance of the primary winding and the secondary winding, and the adjusted leakage inductance can be used as a resonant inductor. When the magnetic component is used in a switching power supply, there is no need to set an additional resonant inductor separately, nor is it necessary to greatly increase the distance between the primary winding and the secondary winding, thereby reducing the overall size of the switching power supply, which is conducive to improving the power density of the switching power supply.

[0021] In addition, this solution omits the skeleton, and by using the magnetic core to cooperate with the winding, the positional relationship between the primary winding and the secondary winding and the sub-cover plate is simpler, more stable and reliable. When designing the magnetic component, it is only necessary to stably fix the winding on the magnetic core, keep the relative position between the winding and the sub-cover plate fixed, and then adjust the thickness, shape or material of the sub-cover plate to accurately adjust the leakage inductance value of the magnetic component. As an example, the leakage inductance value of the magnetic component can be increased or decreased by increasing or decreasing the area of ​​the sub-cover plate; the leakage inductance value of the magnetic component can also be increased or decreased by increasing or decreasing the thickness of the sub-cover plate. In addition, during the use of the magnetic component, the leakage inductance value of the magnetic component will be more stable, and the vibration of the magnetic core will not easily cause fluctuations in the leakage inductance value.

[0022] In addition, the magnetic component provided in the embodiment of the present application omits the skeleton by directly matching the magnetic core with the winding. This not only significantly improves the heat dissipation effect of the winding, but also further reduces the volume of the magnetic component, or makes the power of the magnetic component higher at the same volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of a three-dimensional structure of a magnetic component provided in an embodiment of the present application;

[0025] Figure 2is an exploded view of a magnetic component provided in an embodiment of the present application;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of a sub-magnetic core in a magnetic component provided in an embodiment of the present application;

[0027] Figure 4 is a schematic diagram of a three-dimensional structure of another sub-magnetic core in a magnetic component provided in an embodiment of the present application;

[0028] Figure 5 is a schematic cross-sectional structure diagram of another magnetic component provided in an embodiment of the present application;

[0029] Figure 6 It is a schematic cross-sectional structure diagram of another magnetic component provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] 10. Magnetic components;

[0032] 1. Magnetic core;

[0033] 11. main magnetic core; 111. main cover plate; 112. main winding column; 113. common column; 1131. recessed portion;

[0034] 12. sub-magnetic core; 121. sub-cover plate; 122. sub-winding column;

[0035] 2. Winding; 21. Primary winding; 22. Secondary winding. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0037] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] The terms "comprises," "includes," or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0041] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0042] To facilitate understanding of the scheme of the present application, the spline curves and arrows used in the drawings are explained here: the components indicated by the spline curves without arrows are solid components, that is, components with solid structures; the components indicated by the spline curves with arrows are virtual components, that is, components without solid structures.

[0043] First, see Figures 1 to 6 An embodiment of the present application provides a magnetic component 10, which can be applied to a switching power supply, and the magnetic component can be a transformer.

[0044] Specifically, the magnetic component 10 includes a magnetic core 1 and a winding 2. The magnetic core 1 is a magnetic circuit part in the magnetic component 10, and the winding 2 is a circuit part in the magnetic component 10. The winding 2 is arranged on the magnetic core 1.

[0045] The winding 2 includes a primary winding 21 and a secondary winding 22 , and the magnetic core 1 is used to strengthen the magnetic coupling between the primary winding 21 and the secondary winding 22 .

[0046] The winding 2 includes 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 an alternating current, the primary winding 21 will generate an alternating magnetic field in the magnetic core 1, and then generate an induced electromotive force in the secondary winding 22. The ratio of the number of coil turns between the primary winding 21 and the secondary winding 22 in the magnetic component 10 is equal to the voltage ratio. By changing the number of coil 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, thereby achieving the purpose of changing the voltage. It can be understood that since the magnetic component 10 is a transformer, if the number of coil turns of the primary winding 21 is more than the number of coil turns of the secondary winding 22, the transformer can achieve voltage reduction; conversely, if the number of coil turns of the primary winding 21 is less than the number of coil turns of the secondary winding 22, the transformer can achieve voltage increase.

[0047] It should be noted that, in the magnetic component 10 , the number of the primary winding 21 may be one or more, and the number of the secondary winding 22 may also be one or more.

[0048] The magnetic core 1 includes a main magnetic core 11 and a sub-magnetic core 12. The number of the main magnetic cores 11 in the magnetic core 1 is two, and the two main magnetic cores 11 are arranged opposite to each other. The number of the sub-magnetic core 12 in the magnetic core 1 is at least one, and at least one sub-magnetic core 12 is arranged between the two main magnetic cores 11, that is, all the sub-magnetic cores 12 are arranged between the two main magnetic cores 11. As an example, when the number of the sub-magnetic core 12 is one, the sub-magnetic core 12 is located between the two main magnetic cores 11; when the number of the sub-magnetic cores 12 is multiple, all the sub-magnetic cores 12 are located between the two main magnetic cores 11.

[0049] The main magnetic core 11 and the sub-magnetic core 12 are both structural parts made of magnetic materials. Optionally, the magnetic material includes soft magnetic material. Soft magnetic material has low coercivity and high magnetic permeability, so that the magnetic component 10 performs better in high-frequency applications. As an example, soft magnetic materials include iron-silicon alloys (silicon steel sheets) and various soft ferrites.

[0050] The main magnetic core 11 includes a main cover plate 111 , a main winding post 112 and a common post 113 . One end of the main winding post 112 and the common post 113 are both connected to the main cover plate 111 . The number of the common post 113 is at least one.

[0051] One end of the main winding post 112 and the common post 113 are both connected to the main cover plate 111, that is, one end of the main winding post 112 is connected to the main cover plate 111, and one end of the common post 113 is also connected to the main cover plate 111. The main winding post 112 and the common post 113 are spaced apart and stand upright on the same side surface of the main cover plate 111. Optionally, the main winding post 112, the main cover plate 111 and the common post 113 are integrally formed.

[0052] Typically, the number of the main winding pole 112 and the number of the main cover plate 111 in a single main magnetic core 11 are both one, and the number of the common pole 113 can be one or more.

[0053] As an example, the main magnetic core 11 is in an E-shape. Specifically, the number of the main cover plate 111 and the number of the main winding pole 112 are one each, the number of the common poles 113 is two, the two common poles 113 and one main winding pole 112 are erected on the same side surface of the main cover plate 111 at intervals, and the main winding pole 112 is erected between the two common poles 113. The advantage of such a configuration is that the main magnetic core 11 has a higher mechanical strength.

[0054] As an example, the main magnetic core 11 is in a U-shape. The number of the main cover plate 111 , the common pole 113 and the main winding pole 112 are all one, wherein the common pole 113 and the main winding pole 112 stand vertically on the same side surface of the main cover plate 111 at intervals.

[0055] As an example, the main magnetic core 11 is in an X shape. Specifically, the number of the main cover plate 111 and the number of the main winding pole 112 are 1 each, the number of the common poles 113 is 4, and the four common poles 113 and one main winding pole 112 are erected on the same side surface of the main cover plate 111 at intervals, and the four common poles 113 are arranged around the main winding pole 112.

[0056] For easy distinction, see Figure 2 , the two main magnetic cores 11 are respectively referred to as the first main magnetic core 1101 and the second main magnetic core 1102, and the first main magnetic core 1101 is arranged opposite to the second main magnetic core 1102. Specifically, the main winding post 112 of the first main magnetic core 1101 and the main winding post 112 on the second main magnetic core 1102 are opposite to each other, that is, the free end of the main winding post 112 on the first main magnetic core 1101 (that is, the end away from the main cover plate 111) and the free end of the main winding post 112 on the second main magnetic core 1102 face each other; the common post 113 of the first main magnetic core 1101 and the common post 113 on the second main magnetic core 1102 are opposite to each other, that is, the free end of the common post 113 on the first main magnetic core 1101 (that is, the end away from the main cover plate 111) and the free end of the common post 113 on the second main magnetic core 1102 face each other.

[0057] Optionally, all the sub-cores 12 are arranged between two main magnetic cores 11 , specifically, all the sub-cores 12 are arranged between the main winding poles 112 of two oppositely arranged main magnetic cores 11 .

[0058] It can be understood that the length of the main winding post 112 is less than the length of the common post 113. When the first main magnetic core 1101 and the second main magnetic core 1102 are arranged opposite to each other, the free end of the common post 113 on the first main magnetic core 1101 is connected to the free end of the common post 113 on the second main magnetic core 1102, the free end of the main winding post 112 on the first main magnetic core 1101 is spaced from the free end of the main winding post 112 on the second main magnetic core 1102, and all the sub-magnetic cores 12 are located between the free end of the main winding post 112 on the first main magnetic core 1101 and the free end of the main winding post 112 on the second main magnetic core 1102. In this way, the free ends of the common posts 113 of the two main magnetic cores 11 are connected, and the free ends of the main winding posts 112 of the two main magnetic cores 11 are connected through the sub-magnetic cores 12, thereby forming a closed magnetic circuit.

[0059] The sub-magnetic core 12 includes a sub-cover plate 121 and a sub-winding post 122 , and one end of the sub-winding post 122 is fixedly disposed on the sub-cover plate 121 .

[0060] The winding 2 is arranged on the magnetic core 1, specifically, the winding 2 is arranged on the main winding post 112 and the sub-winding post 122. That is to say, the winding 2 does not need to be connected to the magnetic core 1 through a skeleton. Among them, the main winding post 112 can be used to carry the primary winding 21 or the secondary winding 22; similarly, the sub-winding post 122 can be used to carry the primary winding 21 or the secondary winding 22. As an example, the primary winding 21 is sleeved on the main winding post 112 or the sub-winding post 122. As an example, the secondary winding 22 is sleeved on the main winding post 112 or the sub-winding post 122.

[0061] Regardless of the connection relationship between the primary winding 21 and the secondary winding 22 and the main winding post 112 and the sub-winding post 122 , the sub-cover 121 is always kept between the primary winding 21 and the secondary winding 22 , and the sub-cover 121 is used to separate the primary winding 21 and the secondary winding 22 .

[0062] The setting of the sub-cover 121 can effectively adjust the size of the leakage inductance (i.e., leakage inductance) of the magnetic component 10. Specifically, the principle is that the sub-cover 121 forms a semi-closed magnetic circuit with the primary winding 21 located on one side thereof, and the sub-cover 121 forms a semi-closed magnetic circuit with the secondary winding 22 located on the other side thereof. Compared with the case where the sub-cover 121 is not provided on the sub-winding column 122, the length of the magnetic circuit is reduced by half, the length of the magnetic circuit is shortened, and the inductance of the primary winding 21 and the secondary winding 22 is increased, thereby increasing the leakage inductance of the primary winding 21 and the secondary winding 22. The adjusted leakage inductance can be used as a resonant inductor. When the magnetic component 10 is used in a switching power supply, there is no need to set an additional resonant inductor separately, nor is there a need to greatly 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.

[0063] Generally, different switching power supplies require different leakage inductance values. When designing the magnetic component 10 , how to accurately control the leakage inductance value between the primary winding 21 and the secondary winding 22 has always been a difficult problem in the industry.

[0064] In the related art, the leakage inductance of the magnetic component is mainly adjusted by using a magnetic sheet fixed on a frame. The inventor of the present application found in the research process that, for this method, the leakage inductance value is not only affected by the size, shape, material, etc. of the magnetic sheet, but also by the matching relationship between the magnetic sheet and the frame and the matching relationship between the magnetic core and the frame.

[0065] Based on this, the embodiment of the present application provides a new solution, by setting the magnetic core 1 to include an independent main magnetic core 11 and a sub-magnetic core 12, the primary winding 21 and the secondary winding 22 of the winding 2 are installed on the main winding post 112 of the main magnetic core 11 and the sub-winding post 122 of the sub-magnetic core 12, and the sub-cover 121 connected to the sub-winding post 122 in the sub-magnetic core 12 separates the primary winding 21 and the secondary winding 22, thereby reducing the leakage inductance of the magnetic component 10. This solution omits the skeleton, and by using the magnetic core 1 to cooperate with the winding 2, the positional relationship between the primary winding 21 and the secondary winding 22 and the sub-cover 121 is simpler, more stable and reliable. When designing the magnetic component 10, it is only necessary to stably fix the winding 2 on the magnetic core 1, keep the relative position between the winding 2 and the sub-cover 121 fixed, and then adjust the thickness, shape or material of the sub-cover 121 to accurately adjust the leakage inductance value of the magnetic component 10. As an example, the leakage inductance value of the magnetic component 10 can be increased or decreased by increasing or decreasing the area of ​​the sub-cover 121; the leakage inductance value of the magnetic component 10 can also be increased or decreased by increasing or decreasing the thickness of the sub-cover 121. In addition, during the use of the magnetic component 10, the leakage inductance value of the magnetic component 10 will be more stable, and the vibration of the magnetic core 1 will not easily cause fluctuations in the leakage inductance value.

[0066] In addition, the magnetic component 10 provided in the embodiment of the present application omits the skeleton by directly matching the magnetic core 1 with the winding 2. In this way, not only the heat dissipation effect of the winding 2 can be significantly improved, but the volume of the magnetic component 10 can be further reduced, or the power of the magnetic component 10 can be made higher at the same volume.

[0067] In some embodiments, the sub-cover 121 is configured to at least partially protrude from the sub-winding post 122 along the radial direction of the sub-winding post 122. In this way, when the winding 2 is set on the sub-winding post 122, the sub-cover 121 can stop the winding 2, and when the sub-magnetic core 12 is spliced ​​with the main magnetic core 11 or other sub-magnetic cores 12, the sub-cover 121 can directly separate the primary winding 21 and the secondary winding 22, thereby reducing the difficulty of assembling the magnetic component 10.

[0068] When designing the magnetic assembly 10, the leakage inductance of the magnetic assembly 10 can be adjusted by adjusting the number, shape, thickness and size of the sub-covers 121. Generally, as the cross-sectional area of ​​the sub-covers 121 decreases, the leakage inductance decreases; as the thickness of the sub-covers 121 increases, the leakage inductance increases.

[0069] Here, the number of the sub-cover plate 121 can be one or more. As an example, see Figure 3 and Figure 4 The number of the sub-cover plate 121 is one, and the sub-cover plate 121 is fixed to one end of the sub-winding post 122. The sub-cover plate 121 can be extended outward at an equal distance, that is, extended along the radial direction of the sub-winding post 122, and the vertical distance between the top of the sub-cover plate 121 and the outer peripheral surface of the sub-winding post 122 is equal. For details, please refer to Figure 3 The sub-cover plate 121 may also extend outward at non-equidistant distances, and the vertical distance between the top of the sub-cover plate 121 and the outer peripheral surface of the sub-winding column 122 is not equal. For details, please refer to Figure 4 .

[0070] In some embodiments, the sub-cover plate 121 is located on the outer circumference of the sub-winding post 122 , and the sub-cover plate 121 surrounds the sub-winding post 122 along the circumference of the sub-winding post 122 .

[0071] In some embodiments, there may be multiple sub-cover plates 121 , and the multiple sub-cover plates 121 surround the outer circumference of the sub-winding pole 122 and are distributed at intervals.

[0072] Usually, the sub-cover plate 121 can be perpendicular to the outer peripheral surface of the sub-winding post 122, or can be inclined relative to the outer peripheral surface of the sub-winding post 122. Optionally, the sub-cover plate 121 is perpendicular to the outer peripheral surface of the sub-winding post 122, so that when the primary winding 21 and the secondary winding 22 are respectively arranged on both sides of the sub-cover plate 121, the primary winding 21 and the secondary winding 22 can abut against the two side surfaces of the sub-cover plate 121, shortening the distance between the primary winding 21 and the secondary winding 22, thereby reducing the volume of the magnetic component 10.

[0073] In some embodiments, the cross section of the main winding pole 112 is the same as the cross section of the sub-winding pole 122 , that is, the cross section of the main winding pole 112 and the cross section of the sub-winding pole 122 are consistent in shape and have the same area. In this way, when the sub-core 12 is set between the two main magnetic cores 11, the main winding post 112 and the sub-winding post 122 can be set coaxially, that is, the central axis of the main winding post 112 is colinear with the central axis of the sub-winding post 122, and projected along the common central axis of the two. The orthographic projection of the main winding post 112 on the plane where the sub-cover 121 is located overlaps with the orthographic projection of the sub-winding post 122 on the plane where the sub-cover 121 is located. When the sub-cover 121 is set to at least partially protrude from the sub-winding post 122 along the radial direction of the sub-winding post 122, the sub-cover 121 also protrudes at least partially from the main winding post 112 along the radial direction of the main winding post 112. When the winding 2 is set on the main winding post 112 and the sub-winding post 122, the sub-cover 121 can effectively separate the primary winding 21 and the secondary winding 22.

[0074] In some embodiments, the sub-cover plate 121 and the sub-winding post 122 are integrally formed. It is understandable that there is no gap between the sub-winding post 122 and the sub-cover plate 121 at the connection, so that the leakage inductance value can be more accurately regulated. It should be noted that the sub-winding post 122 and the sub-cover plate 121 are both made of magnetic materials, but the sub-winding post 122 and the sub-cover plate 121 can be made of the same magnetic material or different magnetic materials. Optionally, the sub-winding post 122 and the sub-cover plate 121 are made of the same magnetic material, which is convenient. When the sub-winding post 122 and the sub-cover plate 121 are integrally formed, the preparation process can be simplified.

[0075] In some embodiments, see Figures 2 to 4, the sub-core 12 is a T-shaped core, that is, the sub-cover 121 is arranged to protrude from the sub-winding post 122 along the radial direction of the sub-winding post 122 as a whole. As an example, the sub-cover 121 is arranged on an end face of the sub-winding post 122. The advantage of such an arrangement is that it further reduces the difficulty of manufacturing the sub-core 12 and the difficulty of installing the winding 2 and the sub-core 12. Especially in the case where the sub-winding post 122 and the sub-cover 121 are integrally formed, the molding is usually performed with the aid of a mold during the preparation process. By setting the sub-cover 121 at the end of the sub-winding post 122, the difficulty of demolding the product or the difficulty of mold design can be reduced. In addition, the winding 2 can also be designed as a coil structure, and the coil structure winding 2 is sleeved on the sub-winding post 122 to improve the efficiency of assembly.

[0076] Since the magnetic core 1 is configured to include an independent main magnetic core 11 and a sub-magnetic core 12, when assembling the magnetic component 10, the main magnetic core 11 and the sub-magnetic core 12 need to be spliced ​​together. When splicing the main magnetic core 11 and the sub-magnetic core 12, the end of the sub-cover plate 121 away from the sub-winding post 122 may be in contact with the main winding post 112. When there are multiple sub-magnetic cores 12, the sub-magnetic core 12 that is not in contact with the main winding post 112 is in contact with another sub-magnetic core 12, specifically, the end of the sub-cover plate 121 away from the sub-winding post 122 is in contact with the sub-winding post 122 of another sub-magnetic core 12. In addition, the end of the sub-cover plate 121 away from the sub-winding post 122 may also be in contact with the sub-cover plate 121 of another sub-magnetic core 12. This arrangement can make the assembly of the magnetic component 10 simpler.

[0077] In some embodiments, the winding 2 is a coil structure. By designing the winding 2 as a coil structure, the winding 2 can be quickly mounted on the magnetic core 1 to improve the assembly efficiency of the magnetic component 10.

[0078] In some embodiments, the winding 2 may be wound by enameled wire or copper wire. As an example, the conductive part of the winding 2 is a multi-strand twisted wire made of enameled wire, and the outer side of the winding 2 also has an insulating layer.

[0079] In some embodiments, the outer side surface of the sub-cover 121 is not lower than the outer side surface of the winding 2. Here, the outer side surface of the sub-cover 121 refers to the side surface of the sub-cover 121 away from the sub-winding pole 122; the outer side surface of the winding 2 refers to the side surface of the winding 2 away from the magnetic core 1. Optionally, the outer side surface of the sub-cover 121 is flush with the outer side surface of the winding 2. Optionally, the outer side surface of the sub-cover 121 protrudes from the outer side surface of the winding 2. In this way, the sub-cover 121 can effectively separate the primary winding 21 and the secondary winding 22 in the winding 2.

[0080] In some embodiments, the main winding pole 112 is cut along the radial direction, and the cross section (also referred to as the cross section) of the main winding pole 112 is one of a circular shape, an ellipse, a square shape, and a racetrack shape. The sub-winding pole 122 is cut along the radial direction, and the cross section (also referred to as the cross section) of the sub-winding pole 122 is one of a circular shape, an ellipse, a square shape, and a racetrack shape.

[0081] In some embodiments, when the common column 113 is cut along the radial direction, the cross-section (also called the cross section) of the common column 113 is larger than the cross-section of the main winding column 112 , which can improve the mechanical strength of the main magnetic core 11 .

[0082] In some embodiments, see Figure 2 , a recessed portion 1131 is also formed on the common column 113, and the recessed portion 1131 is used to avoid the sub-cover plate 121 to prevent the sub-cover plate 121 from contacting the common column 113 and causing magnetic saturation when the main magnetic core 11 and the sub-magnetic core 12 are spliced. In detail, the recessed portion 1131 is formed by the side surface of the common column 113 facing the main winding column 112 being recessed toward the inside of the common column 113. The setting of the recessed portion 1131 can effectively reduce the risk of the sub-cover plate 121 contacting the common column 113, and can also reduce the size of the main magnetic core 11, thereby reducing the volume of the magnetic assembly 10. Optionally, the inner surface of the recessed portion 1131 is used to support the winding 2. As an example, when the magnetic core 1 and the winding 2 are assembled together to form the magnetic assembly 10, the primary winding 21 is sleeved on the main winding post 112, the secondary winding 22 is sleeved on the sub-winding post 122, the main winding post 112 is connected to the sub-magnetic core 12, the sub-cover 121 is located between the main winding post 112 and the sub-winding post 122, the primary winding 21 and the secondary winding 22 are supported on the inner surface of the recessed portion 1131, and the side edge of the sub-cover 121 is spaced from the inner surface of the recessed portion 1131. In this case, all the sub-magnetic cores 12 are located on the same side of the common post 113.

[0083] In some embodiments, the sub-core 12 is spliced ​​with the main core 11, specifically, the sub-core 12 is bonded to the main core 11. As an example, the main winding post 112 of the main core 11 is bonded to the sub-cover 121 of the sub-core 12. Of course, in some embodiments, the main winding post 112 of the main core 11 may be bonded to the sub-winding post 122 of the sub-core 12.

[0084] In some embodiments, two main magnetic cores 11 are disposed opposite to each other, and the common column 113 of one main magnetic core 11 is bonded to the common column 113 of the other main magnetic core 11 .

[0085] In some embodiments, there are multiple sub-cores 12, and different sub-cores 12 are also bonded. For example, the sub-cover plate 121 of one sub-core 12 is bonded to the sub-winding post 122 of another sub-core 12; or, the sub-winding post 122 of one sub-core 12 is bonded to the sub-winding post 122 of another sub-core 12.

[0086] The manufacturing is facilitated by splicing the sub-core 12 and the main magnetic core 11 and different sub-cores 12 together by bonding.

[0087] In some embodiments, the sub-core 12 is located between the main winding posts 112 of two oppositely arranged main cores 11, and the total length of the main winding posts 112 and the sub-core 12 is equal to the total length of the common post 113. Here, the total length of the main winding posts 112 and the sub-core 12 refers to the sum of the lengths of the main winding posts 112 of the two main cores 11 and the lengths of all the sub-cores 12. The total length of the common post 113 is the sum of the lengths of the common posts 113 of the two main cores 11. In this case, the winding 2 can be set to a coil structure, and the winding 2 is sleeved on the main winding posts 112 and the sub-winding posts 122, which is conducive to improving the assembly efficiency of the magnetic component 10.

[0088] In some embodiments, see Figure 2 , Figure 5 and Figure 6, the number of sub-cores 12 is greater than 1, all sub-cores 12 are spliced ​​together in sequence, and the sub-cover plate 121 is located between two adjacent primary windings 21 and secondary windings 22, that is, one primary winding 21 is located on one side of the sub-cover plate 121 and is adjacent to the sub-cover plate 121, and one secondary winding 22 is located on the other side of the sub-cover plate 121 and is also adjacent to the sub-cover plate 121. Specifically, all sub-cores 12 are arranged in sequence along the first direction, where the first direction is the direction from one main magnetic core 11 to another main magnetic core 11, for example, from the first main magnetic core 1101 to the second main magnetic core 1102, that is, the first direction can be along the radial direction of the winding column of the magnetic component. The advantage of such an arrangement is that the magnetic component 10 is not only compact in structure, but also conducive to controlling the volume of the magnetic component 10. The number of sub-cores 12 is greater than 1, that is, the number of sub-cores 12 is two or more. As an example, the number of sub-cores 12 is 2, 3, 4, 5, 6, 7 or 8. It should be noted here that, when there are multiple sub-cores 12, the sub-cores 12 may be the same or different. Optionally, the sub-cores 12 are the same, that is, the material, size, etc. of each sub-core 12 are the same, which is convenient for simplifying the production process of the sub-cores 12 and reducing the production cost of the magnetic component 10. Optionally, the sub-cores 12 are different, that is, at least one of the material, size, etc. of each sub-core 12 is inconsistent. For example, the thickness of the sub-cover plate 121 is different between different sub-cores 12, or the length of the sub-winding column 122 is different. The performance of the magnetic component 10 can be further adjusted by differentially setting each sub-core 12.

[0089] In the first direction, all the sub-cores 12 are spliced ​​together in sequence, specifically, all the sub-cores 12 are distributed in sequence, and all the sub-cores 12 are spliced ​​and arranged in sequence. It should be noted here that when all the sub-cores 12 are spliced ​​and arranged in sequence, all the sub-cores 12 may be oriented in the same direction, or some of the sub-cores 12 may be oriented in opposite directions. Furthermore, when the directions are opposite, two adjacent sub-cores 12 may be arranged face to face or back to back. Here, the face-to-face arrangement between two adjacent sub-cores 12 refers to the sub-winding column 122 of one sub-core 12 facing the sub-winding column 122 of the other sub-core 12; the back-to-back arrangement between two adjacent sub-cores 12 refers to the sub-cover plate 121 of one sub-core 12 being connected to the sub-cover plate 121 of the other sub-core 12.

[0090] In some embodiments, among all the sub-cores 12 spliced ​​together in sequence, between any two adjacent sub-cores 12, the sub-cover plate 121 of one sub-core 12 contacts the sub-winding post 122 of another sub-core 12. It can be understood that in this case, all the sub-cores 12 have the same orientation.

[0091] In some embodiments, the magnetic assembly 10 includes at least two adjacent sub-cores 12 disposed opposite to each other. In other words, the magnetic assembly 10 includes a plurality of sub-cores 12, and at least two adjacent sub-cores 12 are disposed opposite to each other. Figure 5 and Figure 6 Among all the sub-magnetic cores 12 spliced ​​together in sequence, at least two adjacent sub-magnetic cores 12 are arranged opposite to each other. This can simplify the manufacturing process of the magnetic component 10 and reduce the production cost.

[0092] In some embodiments, the number of sub-cores 12 is 2n, where n≥1, that is, the number of sub-cores 12 is an even number, and the two sub-cores 12 in the middle can be arranged opposite to each other, further simplifying the manufacturing process of the magnetic component 10 and reducing the production cost. Of course, in other cases, the two sub-cores 12 at the head end of all the sub-cores 12 can be arranged opposite to each other, or the two sub-cores 12 at the end can be arranged opposite to each other.

[0093] In some embodiments, see Figure 2 , when n=1, the number of primary windings 21 and secondary windings 22 is 2 each. Specifically, n=1, the number of sub-cores 12 is two, and the two sub-cores 12 are arranged opposite to each other. It can be understood that in the first direction, the main winding post 112, the sub-cover 121, the sub-winding post 122, the sub-winding post 122, the sub-cover 121, and the main winding post 112 are arranged in sequence. It can be seen that the sub-winding posts 122 of the two sub-cores 12 are adjacent, and there is no sub-cover 121 between the two sub-winding posts 122. The same type of windings 2 can be set on the two sub-winding poles 122. As an example, a primary winding 21 is set on both sub-winding poles 122, or a secondary winding 22 is set on both sub-winding poles 122. The opposite type of windings 2 can also be set on the two sub-winding poles 122. As an example, a primary winding 21 is set on one of the sub-winding poles 122, and a secondary winding 22 is set on the other sub-winding pole 122.

[0094] Optionally, along the first direction, the primary windings 21 and the secondary windings 22 are alternately distributed, that is, along the first direction, the windings 2 are arranged in the following order: primary windings 21, secondary windings 22, primary windings 21, secondary windings 22. In this way, the first group of primary windings 21 and secondary windings 22 are separated by a sub-cover plate 121, and the second group of primary windings 21 and secondary windings 22 are separated by another sub-cover plate 121.

[0095] Optionally, along the first direction, the primary windings 21 are all arranged on the main winding poles 112, and the secondary windings 22 are all arranged on the sub-winding poles 122, that is, along the first direction, the windings 2 are arranged in the following order: primary windings 21, secondary windings 22, secondary windings 22, primary windings 21. In this way, the first group of primary windings 21 and secondary windings 22 are separated by a sub-cover plate 121, and the second group of primary windings 21 and secondary windings 22 are separated by another sub-cover plate 121.

[0096] Optionally, along the first direction, the secondary windings 22 are all arranged on the main winding poles 112, and the primary windings 21 are all arranged on the sub-winding poles 122, that is, along the first direction, the windings 2 are arranged in the following order: secondary windings 22, primary windings 21, primary windings 21, secondary windings 22. In this way, the first group of secondary windings 22 and the primary windings 21 are separated by a sub-cover plate 121, and the second group of secondary windings 22 and the primary windings 21 are separated by another sub-cover plate 121.

[0097] In some embodiments, see Figure 5 and Figure 6 , when n=2, the number of the sub-cores 12 is four. Figure 5 and Figure 6 In the figure, the first sub-core 12 is arranged in the same direction as the second sub-core 12, and the second sub-core 12 is arranged in the opposite direction to the third sub-core 12. Specifically, the second sub-core 12 is arranged opposite to the third sub-core 12, and the third sub-core 12 is arranged in the same direction as the fourth sub-core 12. In addition, the number of primary windings 21 and secondary windings 22 is three each. Since the number of sub-cores 12 is four, the number of sub-winding poles 122 is four, and the number of main cores 11 is two, then the number of main winding poles 112 is two. In this way, three primary windings 21 and three secondary windings 22 can be arranged on four sub-winding poles 122 and two sub-winding poles 122, respectively. Usually, one primary winding 21 or one secondary winding 22 is arranged on one sub-winding pole 122, and one primary winding 21 or one secondary winding 22 is also arranged on one main winding pole 112.

[0098] Continue to see Figure 5 and Figure 6It can be seen that, except for the sub-winding post 122 of the second sub-core 12 and the sub-winding post 122 of the third sub-core 12, there is no sub-cover 121, and sub-covers 121 are provided between the sub-winding posts 122 and the sub-winding posts 122 at other positions, and between the sub-winding posts 122 and the main winding post 112. When setting the winding 2, the primary winding 21 and the secondary winding 22 can be alternately arranged in sequence along the opposite direction of the first direction starting from the winding type (primary winding 21 or secondary winding 22) on the sub-winding post 122 of the second sub-core 12, and the primary winding 21 and the secondary winding 22 can be alternately arranged in sequence along the first direction starting from the winding type on the sub-winding post 122 of the third sub-core 12.

[0099] Optionally, the same type of winding 2 is provided on the sub-winding post 122 of the second sub-magnetic core 12 and the sub-winding post 122 of the third sub-magnetic core 12. As an example, see Figure 5 , primary windings 21 are arranged on the sub-winding poles 122 of the second sub-core 12 and the sub-winding poles 122 of the third sub-core 12, and then along the opposite direction of the first direction, secondary windings 22 are arranged on the sub-winding poles 122 of the first sub-core 12, and primary windings 21 are arranged on the main winding poles 112 on the left. And along the first direction, secondary windings 22 are arranged on the sub-winding poles 122 of the fourth sub-core 12, and primary windings 21 are arranged on the main winding poles 112 on the right. Of course, in some embodiments, the secondary winding 22 may be set on the sub-winding post 122 of the second sub-core 12 and the sub-winding post 122 of the third sub-core 12. In this way, along the opposite direction of the first direction, the primary winding 21 is set on the sub-winding post 122 of the first sub-core 12, and the secondary winding 22 is set on the main winding post 112 on the left. Along the first direction, the primary winding 21 is set on the sub-winding post 122 of the fourth sub-core 12, and the secondary winding 22 is set on the main winding post 112 on the right.

[0100] Optionally, opposite types of windings 2 are respectively arranged on the sub-winding poles 122 of the second sub-magnetic core 12 and the sub-winding poles 122 of the third sub-magnetic core 12. As an example, see Figure 6 , a primary winding 21 is arranged on the sub-winding post 122 of the second sub-core 12, so that, along the opposite direction of the first direction, a secondary winding 22 is arranged on the sub-winding post 122 of the first sub-core 12 in sequence, and a primary winding 21 is arranged on the main winding post 112 on the left; and a secondary winding 22 is arranged on the sub-winding post 122 of the third sub-core 12, and along the first direction, a primary winding 21 is arranged on the sub-winding post 122 of the fourth sub-core 12 in sequence, and a secondary winding 22 is arranged on the main winding post 112 on the right.

[0101] In some embodiments, the magnetic assembly 10 includes at least two adjacent sub-magnetic cores 12 disposed opposite to each other. In other words, the magnetic assembly 10 includes a plurality of sub-magnetic cores 12, and at least two adjacent sub-magnetic cores 12 are disposed opposite to each other.

[0102] In some embodiments, the number of sub-cores 12 is 2n, where n≥1, that is, the number of sub-cores 12 is an even number, and the two sub-cores 12 in the middle may be arranged opposite to each other. Of course, in other cases, the two sub-cores 12 at the head of all the sub-cores 12 may be arranged opposite to each other, or the two sub-cores 12 at the end may be arranged opposite to each other.

[0103] In some embodiments, when n=1, the number of primary winding 21 and secondary winding 22 is 1 each. Specifically, when n=1, the number of sub-cores 12 is two, and the two sub-cores 12 are arranged back to back. It can be understood that in the first direction, the main winding post 112, the sub-winding post 122, the sub-cover 121, the sub-cover 121, the sub-winding post 122, and the main winding post 112 are arranged in sequence. One of the primary windings 21 is arranged on a pair of adjacent main winding posts 112 and sub-winding posts 122, and one secondary winding 22 is arranged on another pair of adjacent winding posts 112 and sub-winding posts 122. At this time, the two sub-covers 121 are located between one primary winding 21 and one secondary winding 22.

[0104] In some embodiments, when n=2, the number of sub-cores 12 is four. Specifically, four sub-cores 12 are arranged in sequence along the first direction, wherein the first sub-core 12 and the second sub-core 12 have the same orientation, and the second sub-core 12 and the third sub-core 12 have opposite orientations, specifically, the second sub-core 12 and the third sub-core 12 are arranged opposite to each other, and the third sub-core 12 and the fourth sub-core 12 have the same orientation. It can be seen that one or two sub-covers 121 are arranged between the sub-winding posts 122 of different sub-cores 12, but there is no sub-cover 121 between the sub-winding posts 122 of the sub-core 12 and the main winding post 112 of the main core 11. When setting the winding 2, along the first direction, the primary winding 21 and the secondary winding 22 can be kept alternately distributed on all the sub-winding posts 122, and the winding type on the main winding post 112 can be the same as the winding type on the adjacent sub-winding post 122.

[0105] In some embodiments, the magnetic assembly 10 includes a plurality of sub-cores 12 , wherein some of the sub-cores 12 are disposed opposite to each other, and some of the sub-cores 12 are disposed opposite to each other.

[0106] As an example, the magnetic component 10 includes four sub-cores 12 arranged in sequence along the first direction, wherein the first sub-core 12 and the second sub-core 12 are arranged opposite to each other, the second sub-core 12 and the third sub-core 12 are arranged back to back, and the third sub-core 12 and the fourth sub-core 12 are arranged opposite to each other.

[0107] In some implementations, the number of the sub-cores 12 may also be an odd number, such as one, three, five, or more.

[0108] In some embodiments, the number of sub-cores 12 is one. The sub-cover plate 121 of the sub-core 12 is connected to one of the main winding posts 112, and the sub-winding post 122 of the sub-core 12 is connected to another main winding post 112. Optionally, a primary winding 21 is provided on one of the main winding posts 112, and a secondary winding 22 is provided on the sub-winding post 122 and another main winding post 112. Optionally, a secondary winding 22 is provided on one of the main winding posts 112, and a primary winding 21 is provided on the sub-winding post 122 and another main winding post 112.

[0109] In some embodiments, the number of the sub-cores 12 is three. The winding 2 includes two primary windings 21 and two secondary windings 22 .

[0110] Optionally, the three sub-cores 12 have the same orientation. As an example, along the first direction, the primary winding 21 and the secondary winding 22 are alternately arranged, wherein a sub-winding post 122 and the main winding post 112 connected thereto jointly carry the same primary winding 21 or secondary winding 22.

[0111] Optionally, among the three sub-cores 12, two adjacent sub-cores 12 are arranged opposite to each other, and the two adjacent sub-cores 12 are oriented in the same direction. As an example, along the first direction, the primary winding 21 and the secondary winding 22 are arranged alternately, but the sub-winding poles 122 of the two relatively arranged sub-cores 12 carry the same primary winding 21 or secondary winding 22.

[0112] It should be noted that, in the embodiment of the present application, the lengths of the main winding posts 112 on the two main magnetic cores 11 may be the same or different. When there are multiple sub-magnetic cores 12, the lengths of the sub-winding posts 122 on different sub-magnetic cores 12 may be the same or different. When designing the magnetic component 10, by adjusting the lengths of the main winding posts 112 and the sub-winding posts 122, the magnetic component 10 may be designed more flexibly, thereby improving the diversity of the magnetic component 10.

[0113] In a second aspect, an embodiment of the present application further provides a switching power supply, which includes the aforementioned magnetic component 10 .

[0114] In some embodiments, the switching power supply includes a charger, which is exemplified as a vehicle-mounted charger.

[0115] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A magnetic component, characterized in that: Including magnetic core and winding; The magnetic core comprises two oppositely arranged main magnetic cores and at least one sub-magnetic core, wherein the sub-magnetic core is arranged between the main magnetic cores; The main magnetic core comprises a main cover plate, a main winding column and a common column, one end of the main winding column and the common column are connected to the main cover plate, and the number of the common column is at least one; The sub-magnetic core comprises a sub-cover plate and a sub-winding column with one end connected to the sub-cover plate; The winding is arranged on the main winding pole and the sub-winding pole, and the winding includes a primary winding and a secondary winding; the sub-cover is used to separate the primary winding from the secondary winding.

2. The magnetic assembly according to claim 1, characterized in that: The sub-cover plate is arranged to at least partially protrude from the sub-winding post along the radial direction of the sub-winding post; the cross-sectional area of ​​the main winding post is the same as the cross-sectional area of ​​the sub-winding post.

3. The magnetic assembly according to claim 2, characterized in that: The sub-magnetic core is a T-shaped magnetic core, and the sub-cover plate and the sub-winding column are integrally formed.

4. The magnetic assembly according to claim 3, characterized in that: The number of the sub-magnetic cores is greater than 1, all the sub-magnetic cores are spliced ​​in sequence, and the sub-cover plate is located between two adjacent primary windings and the secondary windings.

5. The magnetic assembly according to claim 4, characterized in that: At least two adjacent sub-cores are arranged opposite to or back to each other.

6. The magnetic assembly according to claim 5, characterized in that: The number of the sub-magnetic cores is 2n, wherein n≥1, and the two sub-magnetic cores located in the middle are arranged opposite to or back to each other.

7. The magnetic assembly according to claim 6, characterized in that: When n=1, and the two sub-cores are arranged opposite to each other, the number of the primary winding and the number of the secondary winding are 2 respectively; The primary windings and the secondary windings are arranged alternately; or, the primary windings are all arranged on the main winding pole, and the secondary windings are all arranged on the sub-winding pole; or, the primary windings are all arranged on the sub-winding pole, and the secondary windings are all arranged on the main winding pole.

8. The magnetic assembly according to any one of claims 4 to 7, characterized in that: The sub-magnetic core and the main magnetic core, as well as two adjacent sub-magnetic cores, are bonded together.

9. The magnetic assembly according to claim 8, characterized in that: The winding is a coil structure, the sub-core is located between the main winding posts of the two main cores arranged opposite to each other, and the total length of the main winding posts and the sub-core is equal to the total length of the common post.

10. A switching power supply, characterized in that: The invention comprises a magnetic assembly as claimed in any one of claims 1 to 9.

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