Power inductance and power inductance device
Through innovative design of the magnetic core structure, using a shared vertical inner column and upper and lower jaws, combined with high and low permeability materials and connection methods, the problem of large size and weight of inductors has been solved, achieving lightweighting and cost reduction of inductors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SIGENERGY TECHNOLOGY (JIANGSU) CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional inductors are large and heavy, which increases the difficulty and cost of product design and affects portability and aesthetics.
The magnetic core structure includes an upper jaw, a lower jaw, vertical side posts, and vertical inner posts. By sharing the vertical inner post with the upper and lower jaws, a rectangular structure is designed. A vertical inner post is set between every two adjacent vertical side posts. The winding is wound on the vertical side posts. The combination of high magnetic permeability vertical inner posts and low magnetic permeability materials is used to connect the windings using in-phase or out-of-phase connection methods. An air gap is added to decouple the magnetic flux.
This reduces the size and weight of the inductor, lowers manufacturing costs, improves the decoupling effect of the inductor, and reduces the number of winding turns and core size.
Smart Images
Figure CN224355082U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power electronics technology, and in particular to a power inductor and a power inductor device. Background Technology
[0002] With the rapid development of the electronics industry, various electronic products are emerging in an endless stream. Magnetic components are widely used in electronic products, such as photovoltaic inverters, energy storage batteries, electric vehicles, mobile terminals and laptops. Magnetic components are an important part of these products, undertaking key functions such as energy conversion, signal processing, filtering and voltage regulation.
[0003] Inductors, as crucial components in power conversion, play a vital role in electronic products. Whether it's the filter inductor in a DC-AC converter, the energy storage inductor in a DC-DC converter, or the choke coil in various power management systems, the performance of inductors directly affects the energy efficiency, stability, and reliability of the entire electronic system. However, traditional inductors are generally large and heavy, which not only increases the difficulty and cost of product design but also affects the portability and aesthetics of end devices.
[0004] Therefore, how to reduce the size, weight, and cost of inductors is a technical problem that urgently needs to be solved. Utility Model Content
[0005] This utility model provides a power inductor to reduce the size, weight and cost of the inductor; the power inductor includes: a magnetic core structure and at least two windings; the magnetic core structure includes an upper jaw, a lower jaw, at least two vertical side posts and at least one vertical inner post;
[0006] The upper jaw and lower jaw are parallel to each other; at least two vertical side pillars and at least one vertical inner pillar are parallel to each other; at least two vertical side pillars and at least one vertical inner pillar are perpendicular to the upper jaw and lower jaw and are located between the upper jaw and lower jaw; the two ends of each vertical side pillar and each vertical inner pillar are connected to the upper jaw and lower jaw respectively.
[0007] One end of the upper jaw and one end of the lower jaw are connected to the two ends of a vertical side pillar, and the other end of the upper jaw and the other end of the lower jaw are connected to the two ends of another vertical side pillar; a vertical inner pillar is set between each pair of adjacent vertical side pillars;
[0008] Each winding is wound on a vertical post.
[0009] In one embodiment, the permeability of at least one of the vertical inner pillars is greater than the permeability of the upper jaw, the lower jaw, and at least two vertical side pillars.
[0010] In one embodiment, at least one of the vertical inner pillars extends through the upper jaw and the lower jaw.
[0011] In one embodiment, at least one of the vertical inner posts extends through the upper jaw or the lower jaw.
[0012] In one embodiment, at least one of the following locations is provided: the junction of the upper jaw and the vertical side post; the junction of the lower jaw and the vertical side post; the junction of the inner vertical post and the upper jaw; and the junction of the inner vertical post and the lower jaw.
[0013] In one embodiment, at least one of the vertical inner columns has multiple contact-type connection structures at both ends.
[0014] In one embodiment, each winding is wound in the same direction, and the interfaces of each winding on the same side are connected to the same polarity ports of the external circuit.
[0015] In one embodiment, every two adjacent windings are wound in the same direction, and the interfaces of every two adjacent windings located on opposite sides are connected to the same polarity port of the external circuit; or, every two adjacent windings are wound in opposite directions, and the interfaces of every two adjacent windings located on the same side are connected to the same polarity port of the external circuit.
[0016] This utility model embodiment also provides a power inductor device, which includes the power inductor described above.
[0017] The power inductor provided in this embodiment includes: a magnetic core structure and at least two windings; the magnetic core structure includes an upper jaw, a lower jaw, at least two vertical side posts, and at least one vertical inner post; wherein, the upper jaw and the lower jaw are parallel to each other; the at least two vertical side posts and at least one vertical inner post are parallel to each other; the at least two vertical side posts and at least one vertical inner post are perpendicular to the upper jaw and the lower jaw and located between the upper jaw and the lower jaw; the two ends of each vertical side post and each vertical inner post are respectively connected to the upper jaw and the lower jaw; one end of the upper jaw and one end of the lower jaw are connected to the two ends of a vertical side post, and the other end of the upper jaw and the other end of the lower jaw are connected to the two ends of another vertical side post; a vertical inner post is provided between every two adjacent vertical side posts; each winding is wound on a vertical side post. Compared with the existing magnetic device structure, the power inductor of this embodiment can share a vertical inner post between every two adjacent inductors, and all inductors share a horizontal inner post, which can reduce the size, weight, and cost of the inductor. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:
[0019] Figure 1 This is a structural diagram of a power inductor provided in an embodiment of the present utility model;
[0020] Figure 2 This is a schematic diagram of the power inductor structure when n=2 provided in the embodiment of this utility model;
[0021] Figure 3 This is a schematic diagram of the power inductor structure when n=3 provided in the embodiment of this utility model;
[0022] Figure 4 This is a three-dimensional view of a power inductor provided in an embodiment of the present utility model;
[0023] Figure 5 Provided in the embodiments of this utility model Figure 2 A 3D diagram of the corresponding power inductor;
[0024] Figure 6 Provided in the embodiments of this utility model Figure 2 The diagram shows the magnetic flux direction of a power inductor connected in phase.
[0025] Figure 7 Provided in the embodiments of this utility model Figure 2 The diagram shows the magnetic flux direction of a power inductor connected in opposite phases.
[0026] Figure 8 Provided in the embodiments of this utility model Figure 2 The diagram shows the equivalent magnetic circuit model of the power inductor.
[0027] Figure 9 Provided in the embodiments of this utility model Figure 2 A schematic diagram of another equivalent magnetic circuit model of the power inductor shown;
[0028] Figure 10 Provided in the embodiments of this utility model Figure 2 The diagram shows the addition of an air gap to the power inductor.
[0029] Figure 11 Provided in the embodiments of this utility model Figure 10 The diagram shows the equivalent magnetic circuit model of the power inductor.
[0030] Figure 12 Provided in the embodiments of this utility model Figure 4 The diagram shows the equivalent magnetic circuit model of the power inductor. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of this utility model and their descriptions are used to explain this utility model, but are not intended to limit this utility model.
[0032] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.
[0033] Research has found that in existing technologies, methods to reduce the size and weight of magnetic components include improving core performance, increasing the operating frequency of magnetic components, increasing the ripple margin of pre- / post-stage stages, and optimizing heat dissipation structures. However, these methods typically require complex electrical and structural designs and incur high costs.
[0034] Therefore, this utility model provides a power inductor that integrates multiple inductors, thereby reducing the size, weight, and manufacturing cost of the inductor.
[0035] Figure 1 This is a structural diagram of a power inductor provided for an embodiment of the present invention. Figure 1 As shown, the power inductor includes: a magnetic core structure and at least two windings; the magnetic core structure includes an upper jaw 1, a lower jaw 2, at least two vertical side posts 3 and at least one vertical inner post 4.
[0036] like Figure 1 As shown, the upper jaw 1 and the lower jaw 2 are parallel to each other; at least two vertical side pillars 3 and at least one vertical inner pillar 4 are parallel to each other; at least two vertical side pillars 3 and at least one vertical inner pillar 4 are perpendicular to the upper jaw 1 and the lower jaw 2 and are located between the upper jaw 1 and the lower jaw 2; the two ends of each vertical side pillar 3 and each vertical inner pillar 4 are connected to the upper jaw 1 and the lower jaw 2 respectively.
[0037] In this structure, one end point of the upper jaw 1 and one end point of the lower jaw 2 are connected to the two ends of a vertical pillar 3, and the other end point of the upper jaw 1 and the other end point of the lower jaw 2 are connected to the two ends of another vertical pillar 3. That is to say, the upper jaw 1, the lower jaw 2, and the two vertical pillars 3 connected to the two ends of the upper jaw 1 and the lower jaw 2 form a rectangle. The inner vertical pillar 4 and the other vertical pillars 3 other than those that form the sides of the rectangle are located in the rectangle, and an inner vertical pillar 4 is set between every two adjacent vertical pillars 3 in the rectangle.
[0038] Each winding 5 is wound on a vertical post 3.
[0039] Therefore, the vertical side post 3 connected to the endpoints of the upper jaw 1 and the lower jaw 2, the vertical inner post 4 adjacent to the vertical side post 3 connected to the endpoints of the upper jaw 1 and the lower jaw 2, part of the upper jaw, and part of the lower jaw can form an inductor M1; and / or, each pair of adjacent vertical inner posts 4 and the vertical side post 3 located between the two adjacent vertical inner posts 4, part of the upper jaw 1, and part of the lower jaw 2 can also form a parallel inductor M2.
[0040] Thus, in the power inductor of this embodiment, all inductors share a single upper and lower jaw, and every two adjacent inductors share a single vertical inner column. Compared with existing magnetic device structures, the power inductor of this embodiment can reduce the volume and weight of magnetic components.
[0041] In specific implementation, such as Figure 1 As shown, assuming there are n vertical side posts 3, n≥2, since there is a vertical inner post 4 between every two adjacent vertical side posts 3, the number of vertical inner posts 4 can be n-1. In this case, the number of integrated inductors is n, including 2 inductors M1 and n-2 parallel inductors M2.
[0042] For example, refer to Figure 2 This is a schematic diagram of the power inductor structure when n=2, provided in an embodiment of this utility model. Figure 2 In the example, two inductors M1 are integrated, with each inductor coil wound on a vertical side post, and the inner vertical post shared by two adjacent inductors; for example, reference Figure 3 This is a schematic diagram of the power inductor structure when n=3, provided in an embodiment of this utility model. Figure 3 The inductor is an integrated unit of three inductors, with the coil of each inductor wound on a vertical post. It includes two inductors M1 and one parallel inductor M2.
[0043] In one embodiment, at least one vertical inner post 4 may extend through the upper jaw 1 and the lower jaw 2. Specifically, when manufacturing the power inductor, the vertical inner post 4 extends through the upper jaw 1 and the lower jaw 2. Figure 4 This is a three-dimensional diagram of a power inductor, with the left side being a top view and the right side being a front view. Figure 4 It can be seen that the vertical inner column 4 penetrates both the upper jaw 1 and the lower jaw 2.
[0044] In one embodiment, at least one vertical inner post 4 may extend through the upper jaw 1 or the lower jaw 2. Specifically, when manufacturing a power inductor, the vertical inner post 4 extends through the upper jaw 1 or the lower jaw 2. Figure 5 for Figure 2 The diagram shown is a 3D representation of a power inductor. The left side is a top view, and the right side is a front view. Figure 5 It can be seen that the vertical inner column only penetrates the upper jaw.
[0045] In one embodiment, at least one vertical inner post 4 may not penetrate the upper jaw 1 and the lower jaw 2.
[0046] In one embodiment, at least one vertical inner column 4 has multiple contact-type connection structures at both ends. In specific implementation, the two ends of the vertical inner column can be designed as multiple contact-type connection structures. In this way, the connection between the vertical inner column and the upper or lower jaw presents an "octopus-like" structure. Since there are gaps in the middle of the multiple contact-type connection structures, the material of the vertical inner column can be saved, thereby saving manufacturing costs.
[0047] In this embodiment of the invention, to avoid magnetic coupling, the permeability of at least one vertical inner pillar is greater than that of the upper jaw, lower jaw, and at least two vertical side pillars. Based on this, the vertical inner pillars in the power inductor can be made of materials with higher permeability, such as amorphous, nanocrystalline, or ferrite materials, while the upper jaw, lower jaw, and at least two vertical side pillars can be made of materials with lower permeability, such as metal magnetic powder cores.
[0048] In this embodiment of the utility model, considering that the vertical inner column is made of amorphous, nanocrystalline, or ferrite materials, which have high permeability, low saturation magnetic field strength, and relatively higher magnetic induction intensity, when multiple inductors integrated into the power inductor are in working state, the inductors can be connected to the external circuit using either the same-phase connection method or the opposite-phase connection method, as required.
[0049] The same-phase connection method is as follows: each winding is wound in the same direction, and the interface of each winding on the same side is connected to the same polarity port of the external circuit.
[0050] The opposite-phase connection method is as follows: each pair of adjacent windings is wound in the same direction, and the interface of each pair of adjacent windings located on opposite sides is connected to the same polarity port of the external circuit; or each pair of adjacent windings is wound in opposite directions, and the interface of each pair of adjacent windings located on the same side is connected to the same polarity port of the external circuit.
[0051] In practice, the same-phase connection method or opposite-phase connection method can be selected according to the working scenario, working current, system ripple and saturation risk of the power inductor.
[0052] Specifically, the same-phase connection method refers to the fact that the current direction of multiple inductors is the same, resulting in the superposition of magnetic flux in the vertical inner column and the superposition of the DC component of the magnetic induction intensity. Therefore, each winding can be wound in the same direction, and the interface on the same side of each winding can be connected to the same polarity port of the external circuit. For example, the interface of each winding located at the top (i.e., near the upper jaw) can be connected to the positive terminal of the external circuit, and the interface located at the bottom (i.e., near the lower jaw) can be connected to the negative terminal of the external circuit, or the interface located at the top (i.e., near the upper jaw) can be connected to the negative terminal of the external circuit, and the interface located at the bottom (i.e., near the lower jaw) can be connected to the positive terminal of the external circuit. In this way, it can be ensured that the current direction of multiple inductors in the power inductor is the same. Figure 6 As shown, Figure 2 The diagram shows the magnetic flux direction of a power inductor connected in phase.
[0053] Specifically, the non-phase connection method refers to the opposite direction of the current in adjacent inductors. When using the non-phase connection method, the magnetic flux of the vertical inner columns subtracts, and the DC component of the magnetic induction intensity subtracts. Therefore, each pair of adjacent windings can be wound in the same direction, with the interfaces on opposite sides of each pair of adjacent windings connected to the same polarity port of the external circuit; or, each pair of adjacent windings can be wound in opposite directions, with the interfaces on the same side of each pair of adjacent windings connected to the same polarity port of the external circuit. For example, for each pair of adjacent inductors 1 and 2, if the windings of inductors 1 and 2 are wound in the same direction, then the interface where the winding of inductor 1 is located above (i.e., near the upper jaw) and the winding of inductor 2 is located below (i.e., near the lower jaw) is connected to the same polarity port of the external circuit; or, if the windings of inductors 1 and 2 are wound in opposite directions, then the upper part (i.e., near the upper jaw) of the winding of inductor 1 and the upper part (i.e., near the upper jaw) of the winding of inductor 2 are connected to the same polarity port of the external circuit. Figure 7 As shown, Figure 2 The diagram shows the magnetic flux direction of a power inductor connected in opposite phases.
[0054] It should be noted that the external circuit can be a DC-DC converter circuit or an inverter circuit, etc.
[0055] The following is based on Figure 2 Taking this as an example, the principle of magnetic circuits explains that the power inductor of this invention can reduce the size, weight, and manufacturing cost of the inductor.
[0056] First, the principle of magnetic flux decoupling between two adjacent inductors of a power inductor is analyzed using magnetic circuit theory.
[0057] Figure 2 The two inductors are labeled as follows: the inductor on the left is inductance 1, and the inductor on the right is inductance 2. Figure 2The middle vertical inner post only penetrates the upper jaw. Assume the magnetic circuit length of the vertical post of inductor 1 is L1, the upper jaw magnetic circuit length is L2, the lower jaw magnetic circuit length is L3, and the equivalent total air gap magnetic circuit length is L4. The magnetic circuit length of the vertical post of inductor 2 is L5, the upper jaw magnetic circuit length is L6, the lower jaw magnetic circuit length is L7, and the equivalent total air gap magnetic circuit length is L8. The magnetic circuit length of the shared vertical inner post for inductors 1 and 2 is L9, and the effective magnetic circuit length of the shared vertical inner post for inductors 1 and 2 and the lower jaw air gap is L10. The number of turns in the winding of inductor 1 is N1, and the current is I1. The number of turns in the winding of inductor 2 is N2, and the current is I2. The magnetic circuit areas of inductors 1 and 2 are as follows:
[0058] The effective magnetic circuit area of the vertical column of inductor 1 is Ae1;
[0059] The effective magnetic circuit area of the upper jaw of inductor 1 is Ae²;
[0060] The effective magnetic circuit area of the lower jaw of inductor 1 is Ae3;
[0061] The effective magnetic circuit area of the equivalent total air gap of inductor 1 is Ae4;
[0062] The effective magnetic circuit area of the vertical column of inductor 2 is Ae5;
[0063] The effective magnetic circuit area of the upper jaw of inductor 2 is Ae6;
[0064] The effective magnetic circuit area of the lower jaw of inductor 2 is Ae7;
[0065] The inductor 2 has an equivalent total air gap in the lower jaw, and the effective magnetic circuit area of the total air gap is Ae8.
[0066] The effective magnetic circuit area of the shared vertical inner column for inductors 1 and 2 is Ae9;
[0067] Inductor 1 and Inductor 2 share the vertical inner column reluctance and the effective magnetic circuit area of the lower jaw air gap, which is Ae10.
[0068] Air gap permeability is ;
[0069] The permeability of the vertical column is ;
[0070] The permeability of the palate is ;
[0071] The permeability of the mandible is ;
[0072] The permeability of the vertical inner column is .
[0073] According to magnetic circuit theory, it can be drawn as follows: Figure 8 and Figure 9 The equivalent magnetic circuit models of inductor 1 and inductor 2 are shown below, where Figure 8The equivalent magnetic circuit model for in-phase connection is shown below. Figure 9 This is the equivalent magnetic circuit model for the out-of-phase connection method.
[0074] according to Figure 8 and Figure 9 Analysis shows that:
[0075] The magnetomotive force of inductor 1 is N1×I1, and the magnetomotive force of inductor 2 is N2×I2;
[0076] R1 is the reluctance of the vertical column of inductor 1, and ;
[0077] R2 is the upper magnetic reluctance of inductor 1, and ;
[0078] R3 is the lower jaw magnetic reluctance of inductor 1, and ;
[0079] R4 is the equivalent total air gap reluctance of inductor 1, and ;
[0080] R5 is the reluctance of the vertical column of inductor 2, and ;
[0081] R6 is the upper jaw magnetic reluctance of inductor 2, and ;
[0082] R7 is the lower jaw magnetic reluctance of inductor 2, and ;
[0083] R8 is the equivalent total air gap reluctance of inductor 2, and ;
[0084] R9 is the shared vertical inner column reluctance for inductors 1 and 2, and ;
[0085] R10 is a shared vertical inner column reluctance and lower jaw air gap for inductors 1 and 2, and .
[0086] From magnetic circuit theory, it can be deduced that when inductor 1 is working, the magnetomotive force flowing through (R9+R10) / / (R5+R6+R7+R8) is equal to the magnetomotive force flowing through (R1+R2+R3+R4). " / / " indicates parallel connection. Generally, the effective magnetic path area and length of the inner vertical column are similar to those of the outer vertical column; therefore, higher permeability results in lower reluctance. Since the permeability of the inner vertical column is much higher than that of the outer vertical column, the reluctance of the inner vertical column is much lower than the reluctance of the parallel magnetic flux path formed by the outer vertical column, the upper jaw, and the lower jaw. Therefore, the inequality can be derived:
[0087]
[0088] Therefore, it can be assumed that almost all the magnetic flux flows into the vertical inner column path (R9+R10) and does not flow into the inductor 2 branch, i.e., the (R5+R6+R7+R8) branch. This allows for the decoupling of inductor 1 and inductor 2.
[0089] Furthermore, because the two ends of the vertical inner column have multiple contact-type connection structures, the effective magnetic circuit area of the vertical inner column is smaller, and the magnetic reluctance is slightly increased. According to the inductance calculation formula... In inductor 1, = (R1+R2+R3+R4)+(R9+R10) / / (R5+R6+R7+R8), the inductance L decreases slightly, and the ripple increases slightly. According to Ampere's circuital law... and the law of magnetic induction It can be seen that, compared with the non-multiple contact connection structure, the magnetic induction intensity of the vertical inner column is slightly increased, but the corresponding volume, weight and cost are lower.
[0090] The above analysis considers the air gap (i.e., equivalent total air gap magnetic reluctance) that may be generated during the manufacturing process of the power inductor due to technological bottlenecks, but does not consider artificially added air gaps. In practical applications, because the two ends of the vertical inner column adopt a multiple contact-type connection structure, the magnetic reluctance of the vertical inner column increases. When the magnetic permeability of the materials selected for the vertical side column, upper jaw, and lower jaw is high, it may not be able to achieve complete decoupling, and there is a risk of transformer effect in the non-working inductors. That is, if inductor 1 is supplied with current and inductor 2 is not supplied with current, inductor 2 will induce a large current, generating a large induced electromotive force. To solve this problem, in this embodiment of the utility model, an air gap can be provided at at least one of the following locations: the junction of the upper jaw and the vertical side column, the junction of the lower jaw and the vertical side column, the junction of the vertical inner column and the upper jaw, and the junction of the vertical inner column and the lower jaw.
[0091] In specific implementation, for example, Figure 10 As shown, air gaps can be added at points A, B, C, D, E, and F. These air gaps can be air gap plates or blank spaces; no specific rules are specified here. It should be noted that the junctions between the vertical inner post and the upper jaw, and between the vertical inner post and the lower jaw, refer to the junctions where the vertical inner post connects to the upper or lower jaw in each inductor when the vertical inner post passes through the upper or lower jaw. For example, Figure 10 At points C and F.
[0092] The following analysis uses magnetic circuit theory. Figure 10 The diagram illustrates the principle of magnetic flux decoupling when inductors 1 and 2 have an air gap. Specifically, the following analysis focuses on inductor 1 having an air gap at point A, inductor 2 having an air gap at point D, and no air gaps at points B, C, E, and F.
[0093] According to magnetic circuit theory, it can be drawn as follows: Figure 11 The equivalent magnetic circuit models of inductor 1 and inductor 2 are shown below, where Figure 11This is the equivalent magnetic circuit model for the out-of-phase connection method.
[0094] Figure 11 In the diagram, R11 is the air gap reluctance of inductor 1, and R12 is the air gap reluctance of inductor 2. Since the relative permeability of the air gap is 1, which is much lower than the permeability of the magnetic core, the reluctances of R11 and R12 are much higher than that of R9. Therefore, considering the operation of inductor 1, the following equation holds:
[0095]
[0096] Therefore, the magnetic flux generated by the magnetomotive force of inductor 1 on R9 mainly flows through the vertical inner column branch ( Inductor 2 branch ( Almost no magnetic flux flows through it, compared to Figure 2 By adding a larger R12 to the structure, the decoupling effect between inductor 1 and inductor 2 is improved. Based on the same principle, air gaps can be added elsewhere or a larger air gap can be added in that location to improve the decoupling effect.
[0097] The following is about Figure 4 The decoupling principle of the power inductor shown will be explained.
[0098] first, Figure 4 In the middle, the vertical inner column runs through both the upper and lower jaws. Accordingly, according to magnetic circuit theory, it can be drawn as follows: Figure 12 The equivalent magnetic circuit models of inductor 1 and inductor 2 are shown below, where Figure 12 This is the equivalent magnetic circuit model for the in-phase connection method.
[0099] Since the vertical inner column passes through both the upper and lower jaws, the original air gap between the vertical inner column and the lower jaw, shared by inductor 1 and inductor 2, is 0. Increasing the air gap between the lower jaw and the vertical inner column for inductor 1 and the air gap between the lower jaw and the vertical inner column for inductor 2 can be uniformly reduced to the equivalent total air gap of inductor 1 and the equivalent total air gap of inductor 2. Therefore, R10 becomes 0, and the values of R4 and R8 increase. Thus, considering that inductor 1 is working and inductor 2 is not working, the following equation holds:
[0100]
[0101] Therefore, the magnetic flux generated by the magnetomotive force of inductor 1 on R9 mainly flows through... , Since no magnetic flux flows through the branch, a larger R9 is reduced compared to the original structure, improving the decoupling effect between inductor 1 and inductor 2.
[0102] In summary, according to magnetic circuit theory, the power inductors in this embodiment of the present invention can achieve mutual decoupling, and the magnetic reluctance of each inductor is smaller. In particular, the magnetic reluctance of the parallel inductors in the power inductor is further reduced. Therefore, the number of coil turns and the size of the magnetic core can be reduced, and the total inductance can reduce the size, weight and manufacturing cost.
[0103] Furthermore, the power inductor provided in this embodiment of the invention can also have its winding wound on the upper or lower jaw of each inductor, or wound on the vertical post and upper jaw, vertical post and lower jaw, upper jaw and lower jaw, or vertical post, upper jaw and lower jaw. Following the same principle as the magnetic circuit theory described above, the volume and weight of the inductor can also be reduced.
[0104] This utility model embodiment also provides a power inductor device, which includes the aforementioned power inductor. The principle of this power inductor device in solving the problem is similar to that of the aforementioned power inductor, and the repeated details will not be described again.
[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A power inductor, characterized in that, include: A magnetic core structure and at least two windings; the magnetic core structure includes an upper jaw, a lower jaw, at least two vertical side posts and at least one vertical inner post; Wherein, the upper jaw and lower jaw are parallel to each other; at least two vertical side pillars and at least one vertical inner pillar are parallel to each other; at least two vertical side pillars and at least one vertical inner pillar are perpendicular to the upper jaw and lower jaw and are located between the upper jaw and lower jaw; the two ends of each vertical side pillar and each vertical inner pillar are respectively connected to the upper jaw and lower jaw. One end of the upper jaw and one end of the lower jaw are connected to the two ends of a vertical side post, and the other end of the upper jaw and the other end of the lower jaw are connected to the two ends of another vertical side post; a vertical inner post is provided between every two adjacent vertical side posts. Each of the windings is wound on a vertical post.
2. The power inductor as described in claim 1, characterized in that, The magnetic permeability of at least one of the vertical inner pillars is greater than that of the upper jaw, the lower jaw, and at least two vertical side pillars.
3. The power inductor as described in claim 1, characterized in that, At least one of the vertical inner pillars penetrates the upper jaw and the lower jaw.
4. The power inductor as described in claim 1, characterized in that, At least one of the vertical inner pillars penetrates the upper jaw or the lower jaw.
5. The power inductor as described in claim 1, characterized in that, An air gap is provided at least one of the following locations: the junction of the upper jaw and the vertical side post; the junction of the lower jaw and the vertical side post; the junction of the vertical inner post and the upper jaw; and the junction of the vertical inner post and the lower jaw.
6. The power inductor as described in claim 1, characterized in that, At least one of the vertical inner columns has multiple contact-type connection structures at both ends.
7. The power inductor as described in claim 1, characterized in that, Each winding is wound in the same direction, and the interface of each winding on the same side is connected to the same polarity port of the external circuit.
8. The power inductor as described in claim 1, characterized in that, Each pair of adjacent windings is wound in the same direction, and the interfaces of each pair of adjacent windings located on opposite sides are connected to the same polarity port of the external circuit; or, each pair of adjacent windings is wound in opposite directions, and the interfaces of each pair of adjacent windings located on the same side are connected to the same polarity port of the external circuit.
9. A power inductor device, characterized in that, Including the power inductor as described in any one of claims 1-8.