High coupling coefficient inductor

Abstract

The application discloses a high-coupling-coefficient inductor, which comprises a magnet, a coil assembly arranged in the magnet and around a center column of the magnet, and an electrode; the coil assembly comprises N groups of coils with the same wiring; the N groups of coils are wound around the center column from N 1 / N division points in the circumferential direction of the center column respectively; wherein N is greater than or equal to 2; in each layer of the coil assembly, each group of coils comprises an inner coil part and an outer coil part, and in each two adjacent groups of coils, the inner coil part of one group is inlaid with the outer coil part of the other group; after any one group of coils is rotated by an angle of 2nπ / N around the central axis, the group of coils can coincide with other groups of coils; wherein n is a positive integer less than N.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic components, and in particular to a high coupling coefficient inductor. BACKGROUND

[0002] With the trend of electronic products towards miniaturization, lightness and high performance, higher requirements are put forward for the characteristics and integrated design of components. At present, discrete inductors are still used in some multi-phase circuits of switching power supplies, which occupies most of the space on the circuit board, and the increase in the number of inductors increases the loss of the circuit, resulting in reduced conversion efficiency. The integration of inductors, coupled inductors, not only reduces the volume occupied by inductors in the circuit, but also reduces the loss of inductors themselves.

[0003] Coupled inductors not only have the advantage of small size, but also affect the entire circuit due to their magnetic coupling. Compared with discrete inductors, coupled inductors have magnetic coupling, which can cancel out current ripples. The current ripple cancellation can affect all components in the entire circuit, including MOSFET, inductor coil, PCB trace, etc., thereby reducing the current ripple amplitude. The larger the coupling coefficient, the smaller the current ripple in the circuit. Therefore, the use of coupled inductors helps to improve the conversion efficiency of the power supply and obtain faster transient response, thereby reducing the output capacitor demand. Therefore, in order to further reduce the ripple current and improve the efficiency, it is required that the coupled inductor has a higher coupling coefficient.

[0004] In the existing coupled inductor with double coils stacked up and down around the middle column of the magnetic core, the DC resistance of the double coils is not equal due to the different lengths of the double coil leads. At the same time, there is a gap between the double coils, and the leakage inductance between the coils is large, and the coupling coefficient is small.

[0005] In the existing coupled inductor with double coils combined inside and outside around the middle column of the magnetic core, although the coupling coefficient is high, the problem of inconsistent conductor lengths of the two sets of coils still exists in the inside-outside combination of one set of coils inside and the other set of coils outside. Therefore, under the same wire diameter condition, the DC resistance of the double coils is not equal. SUMMARY

[0006] In view of this, the present application proposes a high coupling coefficient inductor, which improves the design of the inside-outside inlaid combination of the coils. By coordinating each coil with other coils, the coupling ability between the coils is increased, the coupling coefficient of the inductor is improved, and the conductor lengths of each set of coils are consistent, ensuring that the conversion efficiency of each circuit is consistent.

[0007] The application discloses a high-coupling-coefficient inductor, which comprises a magnet, a coil assembly arranged in the magnet and around a center column of the magnet, and an electrode; the coil assembly comprises N groups of coils with the same wiring; the N groups of coils are wound around the center column from N circumferential 1 / N division points of the center column respectively; wherein N is greater than or equal to 2; in each layer of the coil assembly, each group of coils comprises an inner coil part and an outer coil part, and in each adjacent two groups of coils, the inner coil part of one group is inlaid in the outer coil part of the other group; any one group of coils can coincide with other groups of coils after rotating around a central axis by an angle of 2nπ / N, wherein n is a positive integer less than N.

[0008] Further, in the same layer of the coil assembly, the winding directions of the N groups of coils are the same, and are all from the outer coil to the inner coil or all from the inner coil to the outer coil.

[0009] Further, the winding directions of adjacent layers of the coil assembly are different; when the winding direction of one layer is from the outer coil to the inner coil, the winding direction of the adjacent layer of the layer is from the inner coil to the outer coil.

[0010] Further, in any adjacent two layers of the same group of coils, the end of a layer wound first is electrically connected with the start end of a layer wound later.

[0011] Further, the electrode is used for connecting the inductor with an external circuit; the electrode is an independent conductor connected with the leading end of the coil assembly, or the leading end of the coil assembly is directly used as the electrode.

[0012] Further, when N is equal to 2, in each layer of the coil assembly, the two groups of coils are not wound around the center column for one full circle to leave a gap, and the gap of any one group of coils is used for the inner coil part of the other group of coils to enter, so that the two groups of coils are nested with each other.

[0013] Further, when N is equal to 2, one group of coils can coincide with the other group of coils after rotating around a central axis by 180 degrees.

[0014] Further, when N is greater than or equal to 3, in each layer of the coil assembly, the inner coil part of the first group of coils is inlaid between the outer coil part of the second group of coils and the center column, the inner coil part of the second group of coils is inlaid between the outer coil part of the third group of coils and the center column, and so on, the inner coil part of the N-1th group of coils is inlaid between the outer coil part of the Nth group of coils and the center column; and the inner coil part of the Nth group of coils is inlaid between the outer coil part of the first group of coils and the center column.

[0015] Further, when N≥3, any one group of coils rotates 2π / N, 4π / N, …, 2nπ / N around the central axis in the first direction, respectively, and can coincide with the first group of coils, the second group of coils, …, the n group of coils on the first direction side, respectively; the first direction is the clockwise direction or the counterclockwise direction.

[0016] Further, the coil assembly is made of flat enameled wire, or made of round copper wire with a paint film, or formed in a way of layering a printed conductive layer.

[0017] The beneficial effects of the technical scheme of the present application are that the multiple groups of coils of the inductor have the same conductor length, and as long as the wire specifications of each group of coils are the same, the multiple groups of coils can have the same DC resistance, thereby ensuring that the conversion efficiency in the circuit where each group of coils is located is consistent; in addition, the mutual nesting arrangement of the inner and outer coils between the multiple groups of coils improves the coupling capacity of the coil compared with the existing overall inner and outer combination of the coil, so that the coupling coefficient is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective structural schematic diagram of a dual-phase coupled inductor in the embodiment of the present application.

[0019] Figure 2 is a coil assembly schematic diagram of a dual-phase coupled inductor in the embodiment of the present application.

[0020] Figure 3-1 、 Figure 3-2 are a first group of coils and a second group of coils of a coil assembly of a dual-phase coupled inductor in the embodiment of the present application, respectively.

[0021] Figure 4 is a magnetic core schematic diagram of a dual-phase coupled inductor in the embodiment of the present application.

[0022] Figure 5 is a winding schematic diagram of a coil assembly of a dual-phase coupled inductor in the embodiment of the present application.

[0023] Figure 6 is a perspective structural schematic diagram of a three-phase coupled inductor in the embodiment of the present application.

[0024] Figure 7 is a coil assembly schematic diagram of a three-phase coupled inductor in the embodiment of the present application.

[0025] Figure 8 is a schematic diagram of one group of coils of a coil assembly of a three-phase coupled inductor in the embodiment of the present application.

[0026] Figure 9 is a magnetic core schematic diagram of a three-phase coupled inductor in the embodiment of the present application.

[0027] Figure 10 is a winding schematic diagram of a coil assembly of a three-phase coupled inductor in embodiments of the present application. DETAILED DESCRIPTION

[0028] The present application will be further described below with reference to the drawings and specific embodiments, examples. The purpose of providing examples is only to illustrate, not to any limit.

[0029] In addition, the "up", "down", "left", "right", "top", "bottom" and other spatial orientation words or positioning words used in the description of the technical solutions of the present application are used to describe the relative position relationship between the components of the product, and do not represent that the product only has the orientation shown in the figure. In actual use, as the orientation of the product changes (for example, 90 degrees or other orientations), the spatial relationship used to describe its orientation should also be interpreted in a similar manner.

[0030] Referring to Figure 1 , the embodiments of the present application provide a two-phase coupled inductor, which includes a magnet 1, a coil assembly 2 located in the magnet 1 and assembled around the center column 11 of the magnet, and an electrode 3. The magnet 1 is the main part of the inductor, which is made of magnetic material, and the material of the magnetic material can be one or a combination of ferrite, alloy, etc. In some embodiments, the magnet 1 can be a whole structure including the center column 11 and the leaf (or leaf swing) 10, which can be integrally formed by placing the coil assembly in the mold and then molded or formed by other means. In other embodiments, the center column 11 and the leaf 10 are an integral structure such as a magnetic core, and the coil assembly is assembled with the magnetic core and then molded or formed by other means to form the magnet. It should be understood that the above is only an example, and the present application does not limit the composition, formation method and structure of the magnetic material main body of the inductor. Referring to Figure 4 , Figure 4 is Figure 1 an exemplary magnetic core schematic diagram of a two-phase coupled inductor, which is a T-shaped magnetic core including a leaf 10 and a center column 11, and the leaf 10 is cross-shaped, and four notches provide electrode placement positions.

[0031] Referring to Figure 2 , the coil assembly of the two-phase coupled inductor provided by the embodiments of the present application includes two groups of coils 21 and 22, the first group of coils 21 as shown in Figure 3-1 , and the second group of coils 22 as shown in Figure 3-2As shown, the two groups of coils have exactly the same wire traces (including shape and size). In this embodiment, the wire of the coil assembly is flat, which can be made of flat enameled wire; or can be formed by printing multiple layers of conductive layers in the order of insulation layer-conductive layer-insulation layer-conductive layer-…-insulation layer to form a multi-layer coil. In addition, the coil assembly can also be wound with round copper wire with a paint film. The present application does not limit the shape and material of the wire and the manufacturing process of the coil assembly, but focuses on the structure of the coil assembly. For reference Figure 1 、 Figure 2 and Figure 5 The coil assembly of the dual-phase coupled inductor is a multi-layer coil structure composed of two groups of coils. The two groups of coils 21 and 22 are wound around the center column 11 from the two circumferential 1 / 2 split points of the center column, respectively, to form a coil assembly with the following structural characteristics: in each layer of the coil assembly, both groups of coils contain inner and outer coil parts, and the inner coil part of any one group is inlaid with the outer coil part of the other group; any one group of coils can coincide with the other group of coils after rotating 180° around the center axis. The process of forming the coil assembly with this structural characteristic is exemplarily shown in Figure 5 , Figure 5 for an 8-layer coil:

[0032] Layer 1: from outer to inner. As shown in Figure 5 , assuming that the center column is evenly divided into two halves in the circumferential direction, two 1 / 2 split points can be obtained, and the two groups of coils are wound from the two 1 / 2 split points, respectively. The starting point a start of the first group of coils first forms an outer coil part, and the distance of the outer coil part from the center column is at least greater than the wire diameter to reserve the position of the inner coil part of the second group of coils. The outer coil part of the first group of coils is folded to the inner coil to continue winding after winding the circumferential 1 / 2 center column, but does not wind the other 1 / 2 center column, and a gap is formed for the inner coil of the second group of coils to enter, and the end point is recorded as a1. The starting point b start of the second group of coils first forms an outer coil part, and the distance of the outer coil part from the center column is at least greater than the wire diameter to reserve the position of the inner coil part of the first group of coils. Similarly, the outer coil part of the second group of coils is folded to the inner coil to continue winding after winding the circumferential 1 / 2 center column, but does not wind the other 1 / 2 center column, and a gap is also formed, and the end point is recorded as b1. The first group of coils is folded from the outer coil to the inner coil at the gap. In the first layer, the two groups of coils form the same pattern, and one of them can coincide with the other group after rotating 180° around the center. a start and b start can be used as the bottom lead of the two groups of coils and connected with two independent electrodes 3, respectively, or directly connected as electrodes. The electrode refers to the electrode for connecting the inductor with the external circuit.

[0033] Layer 2: On layer 2, the start point of the first group of coils is electrically connected with the end point of the first group of coils on layer 1, thus the same mark a1 is used; the same is true for the second group. The first group of coils starts from a1 and winds from the inner coil to the outer coil, and the end point is marked as a2; similarly, the second group of coils starts from b1 and winds from the inner coil to the outer coil, and the end point is marked as b2. In the same way, on layer 2, the start point of the winding of the two groups of coils is also a group (2) of 1 / 2 circumferential division points of the center column (different from the group of division points on layer 1).

[0034] Layer 3: Referring to layer 1, the first group of coils starts from a2 and winds from the outer coil to the inner coil, and the end point is marked as a3; the second group of coils starts from b2 and winds from the outer coil to the inner coil, and the end point is marked as b3.

[0035] Layer 4: Referring to layer 2, the first group of coils starts from a3 and winds from the inner coil to the outer coil, and the end point is marked as a4; the second group of coils starts from b3 and winds from the inner coil to the outer coil, and the end point is marked as b4.

[0036] Layer 5: Referring to layer 1, the first group of coils starts from a4 and winds from the outer coil to the inner coil, and the end point is marked as a5; the second group of coils starts from b4 and winds from the outer coil to the inner coil, and the end point is marked as b5.

[0037] Layer 6: Referring to layer 2, the first group of coils starts from a5 and winds from the inner coil to the outer coil, and the end point is marked as a6; the second group of coils starts from b5 and winds from the inner coil to the outer coil, and the end point is marked as b6.

[0038] Layer 7: Referring to layer 1, the first group of coils starts from a6 and winds from the outer coil to the inner coil, and the end point is marked as a7; the second group of coils starts from b6 and winds from the outer coil to the inner coil, and the end point is marked as b7.

[0039] Layer 8: Referring to layer 2, the first group of coils starts from a7 and winds from the inner coil to the outer coil, and the end point is marked as a final; the second group of coils starts from b7 and winds from the inner coil to the outer coil, and the end point is marked as b final.

[0040] In the above example, the number of layers of the coil assembly is 8, and the end points a final and b final of the two groups of coils will be led out as electrodes, or connected to another two independent electrodes 3 respectively. That is, in this exemplary dual-phase coupled inductor, the coil assembly has a total of 4 lead-out ends, which can be directly led out as electrodes of the inductor to connect with the external circuit; or can be electrically connected to four independent electrodes 3, and then connected with the external circuit through the electrodes 3. It should be understood that the 8 layers of coils are only an example, and the number of layers of coils of the coil assembly can be any number of layers, for example, there can be only 1 layer, and the wire end of the inner coil is led out by bending upward or downward in the vertical direction (the axial direction of the center column) to form a special lead-out layer.

[0041] In each layer of the coil assembly, one set of coils can coincide with another set of coils when rotated 180° around the center axis. In addition, one set of coils can coincide with another set of coils when rotated 180° around the center axis of the coil assembly, which is the same as the center axis of the magnetic core.

[0042] The foregoing embodiment describes a two-phase coupled inductor with double coils. The following embodiment extends to a three-phase coupled inductor with three sets of coils by adding one set of coils. Please refer to Figure 6 , which provides a three-phase coupled inductor with a similar structure to the foregoing two-phase coupled inductor. The three-phase coupled inductor mainly includes a magnetic core, a coil assembly, and electrodes. The coil assembly is also arranged around the magnetic core. The main difference is that the coil assembly includes three sets of coils.

[0043] Please refer to Figure 6 to Figure 10 , which provides a three-phase coupled inductor with a similar structure to the foregoing two-phase coupled inductor. The three-phase coupled inductor mainly includes a magnetic core, a coil assembly, and electrodes. The coil assembly is also arranged around the magnetic core. The main difference is that the coil assembly includes three sets of coils. Figure 8 for a schematic diagram of one set of coils. Please refer to Figure 6 , Figure 7 and Figure 10 , which provides a three-phase coupled inductor with a similar structure to the foregoing two-phase coupled inductor. The three-phase coupled inductor mainly includes a magnetic core, a coil assembly, and electrodes. The coil assembly is also arranged around the magnetic core. The main difference is that the coil assembly includes three sets of coils.

[0044] In each layer of the coil assembly, three sets of coils include inner coil portions and outer coil portions, and in each adjacent two sets of coils, the inner coil portion of one set is inlaid with the outer coil portion of the other set. Any one set of coils can coincide with other sets of coils when rotated 2nπ / N around the center axis, where n is a positive integer less than N, and N represents the number of sets of coils. In this example, N = 3. In the case of N = 3, any one set of coils can coincide with the first set of coils on the first direction side when rotated 2π / 3 around the center axis in the first direction (n = 1), and can coincide with the second set of coils on the first direction side when rotated 4π / 3 around the center axis in the first direction (n = 2). The first direction is, for example, the clockwise direction or the counterclockwise direction. The process of forming the coil assembly with this structural feature can be referred to in Figure 10 , Figure 10 for an exemplary process of forming a 10-layer coil:

[0045] Layer 1: from the outer coil to the inner coil. Please refer to Figure 10As shown, in the top view perspective, assuming that the center pillar 11' is equally divided into 3 parts in the circumferential direction, a set of 3 1 / 3 division points can be obtained, and the 3 sets of coils are wound from the 3 1 / 3 division points respectively. The start point a start of the first set of coils first forms an outer coil part, and the distance between the outer coil part and the center pillar is at least greater than the wire diameter to reserve the position of the inner coil part of the second set of coils. The outer coil part of the first set of coils is wound around about 1 / 3 of the center pillar in the circumferential direction, and then folded to the inner coil to continue to wind about 1 / 3 of the center pillar, and the end point is recorded as a1. The start point b start of the second set of coils first forms an outer coil part, and the distance between the outer coil part and the center pillar is at least greater than the wire diameter to reserve the position of the inner coil part of the third set of coils. Similarly, the outer coil part of the second set of coils is wound around about 1 / 3 of the center pillar in the circumferential direction, and then folded to the inner coil to continue to wind about 1 / 3 of the center pillar, and the end point is recorded as b1. The start point c start of the third set of coils first forms an outer coil part outside the inner coil part of the first set of coils, and then folds from between a1 and b start to the inner coil to continue to wind about 1 / 3 of the center pillar, and the end point is recorded as c1.

[0046] In the first layer and each layer thereafter, the three sets of coils form the same pattern in shape. Any one set of coils can be rotated by an angle of 2π / 3, 4π / 3 respectively around the central axis clockwise (or counterclockwise) to coincide with the first set, the second set of coils on the clockwise side (or the counterclockwise side) of the set respectively. a start, b start and c start can be used as the bottom layer lead-out terminals of the three sets of coils, and are connected to three independent electrodes 3 respectively, or can be directly led out as electrodes.

[0047] The second layer: on the second layer, the start point of the first set of coils is electrically connected with the end point of the first set of coils on the first layer, so the same mark a1 is adopted; the second set and the third set are also the same. The first set of coils starts from a1 and winds from the inner coil to the outer coil, and the end point is recorded as a2; the second set of coils starts from b1 and winds from the inner coil to the outer coil, and the end point is recorded as b2; the third set of coils starts from c1 and winds from the inner coil to the outer coil, and the end point is recorded as c2; similarly, on the second layer, the start points of the three sets of coils are also a set (3) of 1 / 3 circumferential division points of the center pillar (different from a set of division points on the first layer).

[0048] The third layer: with reference to the first layer, the first set of coils starts from a2 and winds from the outer coil to the inner coil, and the end point is recorded as a3; the second set of coils starts from b2 and winds from the outer coil to the inner coil, and the end point is recorded as b3; the third set of coils starts from c2 and winds from the outer coil to the inner coil, and the end point is recorded as c3.

[0049] The fourth layer: with reference to the second layer, the first set of coils starts from a3 and winds from the inner coil to the outer coil, and the end point is recorded as a4; the second set of coils starts from b3 and winds from the inner coil to the outer coil, and the end point is recorded as b4; the third set of coils starts from c3 and winds from the inner coil to the outer coil, and the end point is recorded as c4.

[0050] Layer 5: Refer to Layer 1, the first group of coils is wound from the outer layer to the inner layer starting from a4, and the end point is marked as a5; the second group of coils is wound from the outer layer to the inner layer starting from b4, and the end point is marked as b5; the third group of coils is wound from the outer layer to the inner layer starting from c4, and the end point is marked as c5.

[0051] Layer 6: Refer to Layer 2, the first group of coils is wound from the inner layer to the outer layer starting from a5, and the end point is marked as a6; the second group of coils is wound from the inner layer to the outer layer starting from b5, and the end point is marked as b6; the third group of coils is wound from the inner layer to the outer layer starting from c5, and the end point is marked as c6.

[0052] Layer 7: Refer to Layer 1, the first group of coils is wound from the outer layer to the inner layer starting from a6, and the end point is marked as a7; the second group of coils is wound from the outer layer to the inner layer starting from b6, and the end point is marked as b7; the third group of coils is wound from the outer layer to the inner layer starting from c6, and the end point is marked as c7.

[0053] Layer 8: Refer to Layer 2, the first group of coils is wound from the inner layer to the outer layer starting from a7, and the end point is marked as a8; the second group of coils is wound from the inner layer to the outer layer starting from b7, and the end point is marked as b8; the third group of coils is wound from the inner layer to the outer layer starting from c7, and the end point is marked as c8.

[0054] Layer 9: Refer to Layer 1, the first group of coils is wound from the outer layer to the inner layer starting from a8, and the end point is marked as a9; the second group of coils is wound from the outer layer to the inner layer starting from b8, and the end point is marked as b9; the third group of coils is wound from the outer layer to the inner layer starting from c8, and the end point is marked as c9.

[0055] Layer 10: Refer to Layer 2, the first group of coils is wound from the inner layer to the outer layer starting from a9, and the end point is marked as a final; the second group of coils is wound from the inner layer to the outer layer starting from b9, and the end point is marked as b final; the third group of coils is wound from the inner layer to the outer layer starting from c9, and the end point is marked as c final.

[0056] In the above example, the number of layers of the coil assembly is 10, and the end points a final, b final, c final of the three groups of coils will be led out from the top layer as electrodes, or connected to three independent electrodes 3 respectively. That is, in this exemplary three-phase coupled inductor, the coil assembly has a total of 6 leading ends, which can be directly led out as electrodes of the inductor to connect with the external circuit; or can be electrically connected to six independent electrodes 3, and then connected with the external circuit through the electrodes 3. It should be understood that the 10 layers of coils are only an example, and the number of layers of the coil assembly of the three-phase coupled inductor can be any layer, for example, there can be only 1 layer, and the wire end of the inner layer is led out by bending upward or downward in the vertical direction (the axial direction of the middle column) to form a special leading layer.

[0057] Furthermore, the coil assemblies of the three-phase coupled inductors of the above embodiments, in each layer, can coincide with other coil assemblies after one set of coils rotates 2nπ / N degrees around the central axis. In addition, in each layer, one set of coils can coincide with another set of coils after the whole set of coils rotates 2nπ / N degrees around the central axis. For example, referring to Figure 7 the first set of coils 61 can coincide with the second set of coils 62 after rotating 2π / 3 degrees clockwise around the central axis, the second set of coils 62 can coincide with the third set of coils 63 after rotating 2π / 3 degrees clockwise around the central axis, and the third set of coils 63 can coincide with the first set of coils 61 after rotating 2π / 3 degrees clockwise around the central axis. For another example, the first set of coils 61 can coincide with the third set of coils 63 after rotating 4π / 3 degrees clockwise around the central axis (equivalent to rotating 2π / 3 degrees counterclockwise), the second set of coils 62 can coincide with the first set of coils 63 after rotating 4π / 3 degrees clockwise around the central axis, and the third set of coils 63 can coincide with the second set of coils 62 after rotating 4π / 3 degrees clockwise around the central axis.

[0058] It should be understood that the aforementioned two-phase coupled inductor and three-phase coupled inductor are only two specific embodiments of the present application, and the number of coil groups included in the coil assembly is not limited to two or three, but can be any N groups, N≥2. Under each N value, the coil assembly of the present application satisfies: in each layer of the coil assembly, each group of coils includes an inner coil part and an outer coil part, and in each adjacent two groups of coils, the inner coil part of one group is inlaid with the outer coil part of the other group, and after any one group of coils rotates by an angle of 2nπ / N around the central axis, it can coincide with the other group of coils, n is a positive integer less than N. For example, the aforementioned two-phase coupled inductor with N=2, in which any one group of coils rotates by π (clockwise or counterclockwise) around the central axis, that is, 180°, can coincide with the other group; for example, the aforementioned three-phase coupled inductor with N=3, in which any one group of coils rotates by an angle of 2π / 3, 4π / 3 in the first direction around the central axis, respectively, can coincide with the first group of coils and the second group of coils on the first direction side, respectively. The first direction is, for example, clockwise or counterclockwise. In summary, when N≥3, in each layer of the coil assembly, the inner coil part of the first group of coils is inlaid between the outer coil part of the second group of coils and the center column, the inner coil part of the second group of coils is inlaid between the outer coil part of the third group of coils and the center column, and so on, the inner coil part of the N-1 group of coils is inlaid between the outer coil part of the N group of coils and the center column; the inner coil part of the N group of coils is inlaid between the outer coil part of the first group of coils and the center column. And any one group of coils rotates by an angle of 2π / N, 4π / N, …, 2nπ / N in the first direction around the central axis, respectively, can coincide with the first group of coils, the second group of coils, …, the n group of coils on the first direction side, respectively. In fact, when N=2, it also satisfies the above-mentioned case of N≥3, that is: when N=2, in each layer of the coil assembly, the inner coil part of the first group of coils is inlaid between the outer coil part of the second group of coils and the center column, the inner coil part of the N=2 group of coils is inlaid between the outer coil part of the first group of coils and the center column, and any one group of coils rotates by an angle of 2π / N=π in the first direction around the central axis, which can coincide with the first group of coils on the first direction side. The inductor with such a coil assembly has the same DC resistance between each group of coils, ensuring consistent losses of each group of coils and consistent conversion efficiency in the circuit where each group of coils is located.

[0059] As Figure 9 shown is a schematic diagram of the magnetic core of the three-phase coupled inductor, which includes a leaf 10' and a center column 11'. The shape of the center column 11' is preferably a cylinder, and the leaf 10' is preferably a regular hexagon to adapt to the assembly of six independent electrodes. However, this is only exemplary, and the center column and the leaf can also have other shapes, which are not limited by the present application. It should be noted that the magnetic core can also be Figure 4 and Figure 9In addition to the T-shaped core, other cores such as U-shaped core, EE-shaped core, etc. can also be used.

[0060] It should be noted that in the above-mentioned embodiment, the winding direction of the N groups of coils in the same layer of the coil assembly is the same, either from the outer coil to the inner coil or from the inner coil to the outer coil. The winding direction of the adjacent layers of the coil assembly is different. When the winding direction of one layer is from the outer coil to the inner coil, the winding direction of the adjacent layer of the coil assembly is from the inner coil to the outer coil. However, this is only a preferred embodiment. In fact, the winding direction of the N groups of coils in the same layer of the coil assembly can also be different, and the winding direction of the adjacent layers can also be the same. For example, when the coil assembly is formed by stacking printed conductive layers, the direction of each group of coils and each layer is not limited, and the outer coil to the inner coil or the inner coil to the outer coil can be used.

[0061] The high coupling coefficient inductor provided by the embodiment of the present application has a high uniform arrangement of coupling between the multiple groups of coils on each layer, and the coupling coefficient can be as high as 0.98. In particular, the coil assembly structure of the embodiment of the present application can maintain the consistency of the conductor length of the multiple groups of coils by using the same specification wire, thereby ensuring the consistency of the direct current resistance between the groups of coils.

[0062] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For those skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of equivalent substitutions or obvious modifications can be made, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present application.

Claims

1. A high coupling factor inductor, comprising: The application relates to a magnet (1), a coil assembly (2) arranged around a central column (11) in the magnet and an electrode (3); the coil assembly (2) comprises N groups of coils which are identical in wiring; the N groups of coils are wound around the central column from N circumferential 1 / N division points of the central column respectively; wherein N>=2. In each layer of the coil assembly, each group of coils comprises an inner coil part and an outer coil part, and in any two adjacent groups of coils, the inner coil part of one group is inlaid with the outer coil part of the other group; any group of coils can coincide with other groups of coils after rotating around the central axis by an angle of 2npi / N, wherein n is a positive integer less than N. The winding directions of adjacent layers of the coil assembly are different; when the winding direction of one layer is from the outer coil to the inner coil, the winding direction of the adjacent layer of the layer is from the inner coil to the outer coil; in any two adjacent layers of the same group of coils, the end of the layer wound first is electrically connected with the starting end of the layer wound later. In the same layer of the coil assembly, the winding directions of the N groups of coils are the same, either from the outer coil to the inner coil or from the inner coil to the outer coil.

2. The high coupling factor inductor of claim 1, wherein: The electrode is used for connecting the inductor with an external circuit; the electrode is an independent conductor connected with the leading end of the coil assembly, or the leading end of the coil assembly is directly used as the electrode.

3. The high coupling coefficient inductor as described in claim 1, characterized in that: When N=2, in each layer of the coil assembly, neither of the two groups of coils winds a full circle around the central column to leave a gap; the gap of any one group of coils is used for the inner coil part of the other group of coils to enter, so that the two groups of coils are nested with each other.

4. The high coupling coefficient inductor as described in claim 1, characterized in that: When N=2, any one group of coils can coincide with the other group of coils after rotating around the central axis by 180 degrees.

5. The high coupling coefficient inductor as described in claim 1, characterized in that: When N>=3, in each layer of the coil assembly, the inner coil part of the first group of coils is inlaid between the outer coil part of the second group of coils and the central column, the inner coil part of the second group of coils is inlaid between the outer coil part of the third group of coils and the central column, and so on, the inner coil part of the (N-1)th group of coils is inlaid between the outer coil part of the Nth group of coils and the central column; the inner coil part of the Nth group of coils is inlaid between the outer coil part of the first group of coils and the central column.

6. The high coupling coefficient inductor as described in claim 1, characterized in that: When N>=3, any one group of coils can coincide with the first group of coils, the second group of coils,..., the n-th group of coils on the first direction side of the group respectively after rotating around the central axis by an angle of 2pi / N, 4pi / N,..., 2npi / N in the first direction respectively; the first direction is the clockwise direction or the counterclockwise direction.

7. The high coupling coefficient inductor as described in claim 1, characterized in that: The coil assembly is made of flat enameled wire, or made of round copper wire with a paint film, or formed by printing a conductive layer and then laminating.

8. The high coupling factor inductor of claim 1, wherein: ​

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