Large-current low-inductance magnetic device and electronic equipment

Abstract

The utility model relates to the technical field of magnetic devices, and discloses a large-current and low-inductance magnetic device and electronic equipment.The large-current and low-inductance magnetic device comprises a magnetic core, a first functional coil and functional electrodes, the magnetic core is provided with an upper end face and a lower end face which are opposite, and the functional electrodes are arranged on the lower end face; the first function coil is arranged in the magnetic core and comprises a first horizontal part and a first vertical part, a designed inclination angle is kept between the first horizontal part and the side face of the magnetic core in the magnetic core, and the first vertical part is connected to the two ends of the first horizontal part respectively and extends to the lower end face; the functional electrodes are electrically connected with the first vertical parts respectively, and the vertical projections of the functional electrodes on the upper end face or the lower end face are not collinear. The comprehensive performance of the magnetic device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic devices, in particular to a magnetic device with large current and low inductance value and an electronic device. BACKGROUND

[0002] Magnetic devices are widely used in modern electronic devices, for example, inductance elements can realize filtering, energy storage, matching and resonance, etc., and can be applied to the fields of switching power supply, radio frequency circuit, power converter and energy management system, etc. With the rapid development of electronic technology and the continuous improvement of equipment performance requirements, higher requirements are put forward for the stability, efficiency and reliability of magnetic devices. In related technologies, with the popularity of high-power electronic devices (such as electric vehicle charging modules and high-frequency converters), the demand for current in the system gradually increases, which requires inductance elements to be able to operate stably for a long time under large current conditions. At the same time, in high-frequency power supply systems and fast-response circuits, low-inductance inductors can better adapt to the changes of high-frequency signals, reduce the delay of energy storage elements on signal response, and improve the dynamic performance of the circuit. Based on this, how to design a magnetic device with large current and low inductance value has become a technical problem to be solved. SUMMARY

[0003] In view of this, the present application provides a magnetic device with large current and low inductance value and an electronic device to solve the above-mentioned technical problems.

[0004] To achieve the above purpose, according to the first aspect, the technical scheme adopted is:

[0005] A magnetic device with large current and low inductance value, comprising a magnetic core, a first functional coil and a functional electrode, the magnetic core has opposite upper and lower end faces, the functional electrode is arranged on the lower end face, the first functional coil is arranged in the magnetic core and comprises a first horizontal part and a first vertical part, the first horizontal part has a designed inclination angle with the side surface of the magnetic core in the magnetic core, the first vertical part is respectively connected at both ends of the first horizontal part and extends to the lower end face, the functional electrode is respectively electrically connected with the first vertical part, and the vertical projections of the functional electrodes on the upper end face or the lower end face are not collinear.

[0006] The present application is further provided: further comprising at least one second functional coil, the second functional coil is stacked on the first functional coil along a first direction, or the first functional coil and the second functional coil are arranged with a spacing along a second direction in the magnetic core, wherein the first direction is the extension direction of the upper and lower ends of the magnetic core, and the second direction is perpendicular to the first direction.

[0007] The application is further configured that the second functional coil comprises a second horizontal part and a second vertical part, the second vertical part is connected to two ends of the second horizontal part respectively and extends to the lower end surface, and the functional electrode is electrically connected to the second vertical part respectively.

[0008] The application is further configured that the second horizontal part keeps the design inclination angle with the side surface of the magnetic core in the magnetic core.

[0009] The application is further configured that the second horizontal part is connected to the first horizontal part, and the second vertical part is connected to the first vertical part.

[0010] The application is further configured that the second horizontal part is arranged in parallel with the first horizontal part with a spacing, and the second vertical part is arranged in parallel with the first vertical part with a spacing.

[0011] The application is further configured that the functional electrode connected to the second vertical part or the functional electrode connected to the first vertical part extends towards the center of the magnetic core on the lower end surface.

[0012] The application is further configured that the first functional coil and the second functional coil are designed in a “Π” shape in the vertical projection of the second direction.

[0013] The application is further configured that the angle range of the design inclination angle comprises 2° to 43°.

[0014] According to the second aspect, the technical scheme adopted is:

[0015] An electronic device comprising the large-current low-inductance magnetic device of any one of the above embodiments.

[0016] To sum up, compared with the prior art, the application discloses a magnetic device with large current and low inductance value and electronic equipment, which comprises a magnetic core, a first functional coil and a functional electrode, specifically, the magnetic core has opposite upper and lower end faces, the functional electrode is arranged on the lower end face, the first functional coil is arranged in the magnetic core and comprises a first horizontal part and a first vertical part, the first horizontal part has a designed inclination angle with the side face of the magnetic core in the magnetic core, the first vertical part is respectively connected to the two ends of the first horizontal part and extends to the lower end face, the functional electrode is respectively electrically connected with the first vertical part, and the vertical projection of the functional electrode on the upper end face or the lower end face is not collinear, that is, through the above setting, compared with the traditional multi-turn design, the distributed capacitance and the parasitic inductance of the coil winding are greatly reduced, which is suitable for high-frequency and low-inductance application scenarios, and the designed inclination angle of the first horizontal part of the first functional coil can increase the magnetic flux area, thereby increasing the inductance of the product under the condition of the same width and the same material of the product, that is, the horizontal part forms a certain inclination angle with the side face of the magnetic core, so that the magnetic flux path between the coil and the magnetic core is more uniform and the distribution area is larger, the effective area of the magnetic flux in the magnetic core increases with the existence of the inclination angle, thereby enhancing the coupling effect between the magnetic field and the coil, and the vertical part directly extends to the position of the functional electrode, thereby reducing the requirement for additional lead connection and welding points, reducing the contact resistance and process complexity, improving the electrical performance and reliability, and the vertical projection of the functional electrode on the upper end face or the lower end face of the magnetic core is not collinear, which can make the electrode layout more flexible and improve the connection strength of the magnetic device and the external equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] 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.

[0018] Figure 1 is a structural schematic diagram of a first large-current low-inductance magnetic device of the present embodiment;

[0019] Figure 2 is a bottom view structural diagram of the first large-current low-inductance magnetic device of the present embodiment;

[0020] Figure 3 is a cross-sectional structural diagram of the first large-current low-inductance magnetic device of the present embodiment;

[0021] Figure 4 is a structural schematic diagram of a second large-current low-inductance magnetic device of the present embodiment;

[0022] Figure 5 is a structural schematic diagram of a third large-current low-inductance magnetic device of the present embodiment;

[0023] Figure 6 is a bottom structure view of a third large-current low-inductance magnetic device of the present embodiment;

[0024] Figure 7 is a cross-sectional structure view of the third large-current low-inductance magnetic device of the present embodiment. DETAILED DESCRIPTION

[0025] The exemplary embodiments will be described in detail with reference to the drawings. In the following description, like drawing reference numerals are used for like elements, unless explicitly stated otherwise. The following exemplary embodiments described in the detailed description section are not meant to be limiting in terms of the scope of the application. Rather, they are intended to be illustrative embodiments of the application which are consistent with the principles of the present application. It will be apparent to those skilled in the art that certain aspects or components of the exemplary embodiments described herein can be substituted for one another, or combined, without departing from the scope of the application.

[0026] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "includes a", does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eight", "ninth", "tenth", "eleventh", "twelfth", "thirteenth", "fourteenth", "fifteenth", "sixteenth", "seventeenth", "eighteenth", "nineteenth", "twentieth", "twenty-first", "twenty-second", "twenty-third", "twenty-fourth", "twenty-fifth", "twenty-sixth", "twenty-seventh", "twenty-eighth", "twenty-ninth", "thirtieth", "thirty-first", "thirty-second", "thirty-third", "thirty-fourth", "thirty-fifth", "thirty-sixth", "thirty-seventh", "thirty-eighth", "thirty-ninth", "fortieth", "forty-first", "forty-second", "forty-third", "forty-fourth", "forty-fifth", "forty-sixth", "forty-seventh", "forty-eighth", "forty-ninth", "fiftieth", "fifty-first", "fifty-second", "fifty-third", "fifty-fourth", "fifty-fifth", "fifty-sixth", "fifty-seventh", "fifty-eighth", "fifty-ninth", "sixtieth", "sixty-first", "sixty-second", "sixty-third", "sixty-fourth", "sixty-fifth", "sixty-sixth", "sixty-seventh", "sixty-eighth", "sixty-ninth", "seventieth", "seventy-first", "seventy-second", "seventy-third", "seventy-fourth", "seventy-fifth", "seventy-sixth", "seventy-seventh", "seventy-eighth", "seventy-ninth", "eightieth", "eighty-first", "eighty-second", "eighty-third", "eighty-fourth", "eighty-fifth", "eighty-sixth", "eighty-seventh", "eighty-eighth", "eighty-ninth", "ninetieth", "ninety-first", "ninety-second", "ninety-third", "ninety-fourth", "ninety-fifth", "ninety-sixth", "ninety-seventh", "ninety-eighth", "ninety-ninth", and "one hundredth" are used merely to distinguish one element from another and are not meant to be a limitation on the present application.

[0027] It is to be understood that the specific embodiments described herein are merely illustrative of the present application and do not limit the scope of the present application.

[0028] In the following description, suffixes for elements such as "module", "part", or "unit" are used only to facilitate explanation of the present application, and have no specific meaning by themselves. Thus, "module", "part", or "unit" can be used interchangeably.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, the terms "first", "second", "third" are used only for descriptive purposes, and should not be understood as indicating or implying relative importance.

[0030] The technical solutions shown in the application will be described in detail below through specific embodiments. It should be noted that the order of the following embodiments is not a limitation on the priority order of the embodiments.

[0031] Please refer to Figures 1 to 3 The large-current low-inductance magnetic device of the application comprises a magnetic core 1, a first functional coil 2, and a functional electrode 3.

[0032] In the specific implementation process, the magnetic core 1 has opposite upper and lower end faces 1a and 1b, the functional electrode 3 is arranged on the lower end face 1b, and the first functional coil 2 is arranged in the magnetic core 1. The first functional coil 2 comprises a first horizontal part 21 and a first vertical part 22. The first horizontal part 21 has a designed inclination angle with the side surface of the magnetic core 1 in the magnetic core 1 (as shown at Q), the first vertical part 22 is connected to the two ends of the first horizontal part 21 respectively and extends to the lower end face 1b, the functional electrode 3 is electrically connected to the first vertical part 22 respectively, and the vertical projections of the functional electrodes 3 on the upper and lower end faces 1a and 1b are not collinear.

[0033] The vertical projections of the functional electrodes 3 of the magnetic device of the embodiment on the upper and lower end faces are not collinear, so that the functional electrodes 3 maintain a reasonable spatial distribution, the electromagnetic coupling and interference phenomenon between the current paths are reduced, the influence of the parasitic inductance and parasitic capacitance is reduced, and the stability of the circuit performance is improved.

[0034] In addition, the inclination angle design of the first horizontal part 21 and the side surface of the magnetic core 1 makes the magnetic flux distribution more uniform, increases the effective magnetic flux area of the magnetic device, and improves the magnetic coupling efficiency of the magnetic core 1, which directly affects the reduction of the loss of the magnetic core 1, thereby meeting the performance requirements of the device with large current and low inductance.

[0035] In addition, the first vertical part 22 is directly connected to the functional electrode 3, which can reduce the introduction of other conductive structures, effectively reduce the contact resistance of the connection point, thereby improving the efficiency of current transmission, reducing power consumption, and the direct connection of the first vertical part 22 and the functional electrode 3 increases the mechanical strength of the structure, avoids the contact failure phenomenon caused by vibration or external force, thereby enhancing the reliability of the product.

[0036] It can be understood that, under the condition that the width and material of the magnetic device product remain unchanged, the increase of the magnetic flux area means the improvement of the permeability of the magnetic circuit and the reduction of the magnetic resistance. For details, refer to the inductance formula:

[0037] L=(N 2 ·μ·A) / l

[0038] Wherein, L is the inductance, N is the number of turns, μ is the permeability, A is the magnetic flux area, and l is the length of the magnetic circuit.

[0039] Preferably, the first functional coil 2 is a single coil.

[0040] In one embodiment, continuing to refer to Figure 4 the magnetic device with large current and low inductance value further comprises at least one second functional coil 4, and specifically, the second functional coil 4 is stacked on the first functional coil 2 along the first direction.

[0041] In a specific implementation, the second functional coil 4 comprises a second horizontal part 41 and a second vertical part 42, the second vertical part 42 is connected to both ends of the second horizontal part 41 and extends to the lower end surface 1b, and the functional electrode 3 is electrically connected to the second vertical part 42.

[0042] Among them, the second horizontal part 41 keeps a designed inclination angle with the side surface of the magnetic core 1 in the magnetic core 1.

[0043] And, the second horizontal part 41 is connected to the first horizontal part 21, and the second vertical part 42 is connected to the second vertical part 42.

[0044] It should be noted that the present application constructs a space coordinate of X-Y-Z, and Figure 1 , Figure 4 or Figure 5 for example, the Z-axis direction can be regarded as the first direction, the X-axis direction can be regarded as the second direction, and the Y-axis direction can be regarded as the third direction. The first direction can also be regarded as the extension direction of the upper and lower ends of the magnetic core 1, the second direction can also be regarded as the left and right extension direction of the magnetic device with large current and low inductance value, and the third direction can also be regarded as the front and back extension direction of the magnetic device with large current and low inductance value. Of course, the present embodiment is not limited to this, X-Y-Z can also be other arbitrary directions perpendicular to each other in actual demand, which will not be described here.

[0045] Therefore, the second functional coil 4 is stacked on the first functional coil 2 along the first direction, and the second horizontal part 41 of the second functional coil 4 is connected to the first horizontal part 21 of the first functional coil 2, and the second vertical part 42 of the second functional coil 4 is connected to the first vertical part 22 of the first functional coil 2, to form an integrated, multi-layer stacked conductive path structure, which reduces the redundant space inside the magnetic core 1, enhances the utilization rate of the limited space inside the magnetic core 1, realizes the miniaturization and high integration of the device, and the inclination angle design of the first horizontal part 21 and the second horizontal part 41 with the side surface of the magnetic core 1 makes the magnetic flux distribution more uniform, increases the effective magnetic flux area of the magnetic device, improves the magnetic coupling efficiency of the magnetic core 1, optimizes the inductance distribution and the utilization rate of the magnetic core, and keeps the stable and efficient operation of the magnetic device with large current and low inductance value.

[0046] Preferably, the second functional coil 4 is a single coil.

[0047] In one embodiment, continuing to refer to Figures 5 to 7The magnetic device with large current and low inductance includes at least one second functional coil 4, and specifically, the first functional coil 2 and the second functional coil 4 are arranged in the magnetic core 1 in the second direction with a spacing.

[0048] The second horizontal part 41 is arranged in the magnetic core 1 with a designed inclination angle with the side surface of the magnetic core 1, and the second horizontal part 41 is arranged in parallel with the first horizontal part 21 with a spacing, and the second vertical part 42 is arranged in parallel with the first vertical part 22 with a spacing.

[0049] The first functional coil 2 and the second functional coil 4 are arranged with a spacing, and the first functional coil 2 and the second functional coil 4 are electrically isolated, so that the magnetic field interference between the adjacent coils is reduced, the parasitic inductance and the magnetic leakage loss are reduced, the electrical performance of the magnetic device is improved, the current is distributed along a neat path due to the parallel arrangement of the first horizontal part 21 and the second horizontal part 41 and the first vertical part 22 and the second vertical part 42, the local current is prevented from being too high or unevenly distributed, the local heat collection problem is reduced, the coupling noise and the electromagnetic interference between the adjacent coils are reduced due to the parallel and spaced arrangement, and the stability of the magnetic device under high frequency working conditions is ensured, and the magnetic device is suitable for a complex electromagnetic environment.

[0050] In addition, the inclination angle of the first horizontal part 21 and the second horizontal part 41 with the side surface of the magnetic core 1 makes the magnetic flux distribution more uniform, increases the effective magnetic flux area of the magnetic device, improves the magnetic coupling efficiency of the magnetic core 1, optimizes the inductance distribution and the utilization rate of the magnetic core, and maintains the stable and efficient operation of the magnetic device with large current and low inductance.

[0051] It should be noted that the functional electrode 3 connected to the second vertical part 42 or the functional electrode 3 connected to the first vertical part 22 extends towards the center of the magnetic core 1 on the lower end surface 1b, and the vertical projection of the functional electrode 3 on the upper end surface 1a or the lower end surface 1b is not collinear, so that the relative length of the functional electrode 3 on the magnetic core 1 can be adjusted flexibly in the actual application environment, thereby ensuring the reliable welding of the device and external equipment, and the design of the functional electrode 3 extending towards the center of the magnetic core 1 can make the connection of the coil and the electrode more uniform, reduce the asymmetry of the magnetic field, further optimize the distribution of the magnetic flux, improve the magnetic circuit efficiency of the magnetic core, and the design of the functional electrode 3 extending towards the center of the magnetic core 1 effectively increases the heat dissipation area of the functional electrode 3 near the center of the magnetic core 1, which is helpful for uniform distribution and timely conduction of heat, avoids the problems of electrode oxidation or failure caused by local overheating, and the design of the functional electrode 3 extending towards the center of the magnetic core 1 avoids the electrode occupying more space in the periphery, so that the layout of the entire magnetic device is more compact, and the product demand of miniaturization and high integration is met.

[0052] In the vertical projection of the second direction, the first functional coil 2 and the second functional coil 4 are designed in a "Π" shape, which can make the arrangement of the first functional coil 2 and the second functional coil 4 in the magnetic core 1 more compact and regular, effectively guide the magnetic flux to flow along the predetermined path, reduce the leakage phenomenon in the magnetic circuit, thereby improving the utilization efficiency of the magnetic flux, and the "Π" shape design can uniformly distribute the tension generated by the coil during assembly, avoid the uneven stress phenomenon caused by the excessive concentration of the coil, and enhance the stability of the overall structure.

[0053] It should be noted that the angle range of the design inclination angle includes 2° to 43°, and the selection of this angle range further optimizes the performance of the device. Specifically, at a smaller design inclination angle (close to 2°), the coil layout is closer to horizontal, which is beneficial to the stable distribution of the overall magnetic flux of the magnetic core 1, and is suitable for scenarios with low magnetic flux density requirements, such as low-power high-current applications. Moreover, when the inclination angle is small, the path of the coil is relatively smooth, and the tension is smaller, which can improve the service life of the coil. When the design inclination angle is larger (close to 43°), the inclined arrangement of the first horizontal part 21 or the second horizontal part 41 and the side of the magnetic core 1 can significantly increase the effective magnetic flux area of the magnetic core, reduce the leakage path, and improve the magnetic flux coupling efficiency. That is, a larger inclination angle allows the magnetic core 1 to operate stably under high magnetic flux density, meeting the application requirements of high power and high current.

[0054] That is, the range of the design inclination angle of the present application is set to 2° to 43°, and by covering the optimization design of low, medium and high angles, the comprehensive performance of the magnetic device in different application scenarios is improved, including magnetic flux utilization, inductance performance, heat dissipation effect and reliability, thereby meeting the diversified technical requirements and market application scenarios.

[0055] Preferably, the design inclination angle is 18°, 25°, 32° or 41°.

[0056] The present application also discloses an electronic device comprising the large-current low-inductance magnetic device of any of the above embodiments. For other working principles and processes of the electronic device of the present embodiment, please refer to the foregoing description of the large-current low-inductance magnetic device of the present embodiment.

[0057] The large-current low-inductance magnetic device and the electronic device provided by the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples. It should be noted that the description of each embodiment in the present application has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0058] The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application, and each technical feature of the technical solutions of the present application can be combined arbitrarily, in order to make the description simple, each technical feature in the above embodiments is not described all possible combinations, any equivalent structure or equivalent flow conversion made by using the content of the present application and the drawings, or directly or indirectly applied in other related technical fields, as long as the combination of these technical features does not exist contradiction, all are included in the patent protection scope of the present application.

Claims

1. A magnetic device for high current and low inductance, characterized by: The device includes a magnetic core, a first functional coil, and functional electrodes. The magnetic core has an upper end face and a lower end face. The functional electrodes are arranged on the lower end face. The first functional coil is disposed within the magnetic core and includes a first horizontal portion and a first vertical portion. The first horizontal portion maintains a designed tilt angle with the side of the magnetic core within the magnetic core. The first vertical portion is connected to both ends of the first horizontal portion and extends to the lower end face. The functional electrodes are electrically connected to the first vertical portion, and the vertical projections of the functional electrodes on the upper end face or the lower end face are not collinear.

2. The low inductance magnetic device of claim 1, wherein, It also includes at least one second functional coil, which is stacked on top of the first functional coil along a first direction, or the first functional coil and the second functional coil are arranged with a gap in the magnetic core along a second direction, wherein the first direction is the extension direction of the upper and lower ends of the magnetic core, and the second direction is perpendicular to the first direction.

3. The low inductance magnetic device of claim 2, wherein the magnetic core is formed of a material selected from the group consisting of: ferrite, mu-metal, and permalloy. The second functional coil includes a second horizontal portion and a second vertical portion. The second vertical portion is connected to both ends of the second horizontal portion and extends to the lower end face. The functional electrodes are electrically connected to the second vertical portion.

4. The low inductance magnetic device of claim 3, wherein the magnetic core is formed of a material selected from the group consisting of: ferrite, mu-metal, and permalloy. The second horizontal portion maintains the designed tilt angle with the side of the magnetic core within the magnetic core.

5. The low inductance magnetic device of claim 3, wherein the magnetic core is formed of a material selected from the group consisting of: ferrite, mu-metal, and permalloy. The second horizontal portion is connected to the first horizontal portion, and the second vertical portion is connected to the second vertical portion.

6. The low inductance magnetic device of claim 3, wherein the magnetic core is formed of a material selected from the group consisting of: ferrite, mu-metal, and permalloy. The second horizontal portion is arranged parallel to the first horizontal portion with a gap, and the second vertical portion is arranged parallel to the first vertical portion with a gap.

7. The low inductance magnetic device of claim 3, wherein the magnetic core is made of a material selected from the group consisting of: ferrite, mu-metal, and permalloy. The functional electrode connecting the second vertical part or the functional electrode connecting the first vertical part extends toward each other on the lower end surface toward the center of the magnetic core.

8. The low inductance magnetic device of claim 2, wherein the magnetic core is made of a material selected from the group consisting of: ferrite, mu-metal, and permalloy. In the vertical projection of the second direction, the first functional coil and the second functional coil are designed in a "Π" shape.

9. The high-current, low-inductance magnetic device as described in claim 1, characterized in that, The design tilt angle ranges from 2° to 43°.

10. An electronic device, comprising: Including the high-current, low-inductance magnetic device as described in any one of claims 1 to 9.

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