Coupling inductance device

Abstract

The utility model discloses a coupling inductance device which comprises an insulating magnetic core, at least two grooves are arranged in the insulating magnetic core, and the at least two grooves are arranged at intervals along a first direction; the windings are positioned in the grooves in a one-to-one correspondence manner; the insulating magnetic core further comprises at least one containing hole, the containing hole extends in the second direction and is located between every two adjacent grooves, every two adjacent grooves in the first direction are connected through one containing hole, and the second direction and the first direction intersect. The non-magnetic insulating layer is located in the containing hole, and the coupling coefficient between the two windings is related to the thickness of the non-magnetic insulating layer located between the two windings in the third direction. According to the utility model, the short circuit between the two windings can be avoided, the coupling coefficient of the two windings can be improved, and the energy storage capability and the anti-saturation performance are enhanced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of coupled inductors, and in particular to a coupled inductor device. Background Art

[0002] Coupled inductors, available in positive and negative coupling, are commonly used in multiphase topologies to take advantage of the current ripple cancellation created by the magnetic coupling between the two phases. Usually, when using typical discrete inductors, current ripple cancellation occurs only at the output of the multiphase buck converter. When these inductors are magnetically coupled, the current ripple cancellation is applied to all components of the circuit: the Metal-Oxide-Semiconductor Field-EffectTransistor (MOSFET), the inductor windings, and the printed circuit board (PCB) traces. Therefore, the switching of all phases affects each single phase, so the amplitude of the current ripple is reduced and the frequency is multiplied. The waveform reduction detector can improve the efficiency of the power converter or trade off smaller magnetic components, faster transients, and therefore smaller output capacitors.

[0003] At present, coupled inductor devices are generally composed of two magnetic cores and a main winding and a secondary winding. However, such coupled inductor devices are prone to short circuits during the molding process of the main winding and the secondary winding, and the coupling coefficient between the main winding and the secondary winding is not easy to adjust. Utility Model Content

[0004] The embodiment of the utility model provides a coupled inductor device, which can avoid short circuit between windings and adjust the coupling coefficient of two windings, thereby increasing energy storage capacity and anti-saturation performance.

[0005] In a first aspect, an embodiment of the utility model provides a coupled inductor device, comprising: an insulating magnetic core, wherein at least two grooves are arranged in the insulating magnetic core, and the at least two grooves are arranged at intervals along a first direction;

[0006] At least two windings, the windings are located in the grooves in a one-to-one correspondence;

[0007] The insulating magnetic core further includes at least one accommodating hole, which extends in the second direction and is located between two adjacent grooves, and two adjacent grooves arranged in the first direction are connected by an accommodating hole, and the second direction and the first direction are arranged to intersect; a non-magnetic insulating layer, which is located in the accommodating hole;

[0008] The coupling coefficient between the two windings is related to the thickness of the non-magnetic insulating layer between the two windings in the third direction;

[0009] The third direction is perpendicular to the second direction and perpendicular to the first direction.

[0010] Optionally, the high temperature resistance range of the insulating magnetic core is greater than or equal to 600° C. and less than or equal to 850° C.;

[0011] And / or, the non-magnetic insulating layer has a high temperature resistance range of greater than or equal to 600°C and less than or equal to 850°C.

[0012] Optionally, the groove includes a first sub-groove, a second sub-groove and a third sub-groove that are connected;

[0013] The first sub-groove extends from the inside of the insulating magnetic core to the surface of the insulating magnetic core, the second sub-groove extends from the inside of the insulating magnetic core to the surface of the insulating magnetic core, and the third sub-groove is located in the insulating magnetic core and connects the first sub-groove and the second sub-groove;

[0014] The winding includes a first connection portion, a main body portion and a second connection portion, the first connection portion is located in the first sub-groove, the second connection portion is located in the second sub-groove, and the main body portion is located in the third sub-groove;

[0015] The first connection part serves as a current input terminal, and the second connection part serves as a current output terminal, or the first connection part serves as a current output terminal, and the second connection part serves as a current input terminal.

[0016] Optionally, the thickness of the non-magnetic insulating layer in the third direction is greater than or equal to 0.01 mm and less than or equal to twice the thickness of the main body.

[0017] Optionally, in one groove, the first sub-groove and the second sub-groove extend from inside the insulating magnetic core to two oppositely disposed surfaces of the insulating magnetic core;

[0018] The first connection portion and the second connection portion are located on two oppositely disposed surface sides of the insulating magnetic core.

[0019] Optionally, in one groove, the first sub-groove and the second sub-groove extend from inside the insulating magnetic core to the same surface of the insulating magnetic core;

[0020] The first connection portion and the second connection portion are located on the same surface side of the insulating magnetic core.

[0021] Optionally, current directions of two windings adjacent to each other in the first direction are opposite.

[0022] Optionally, the current input ends of two adjacent windings are located on the first surface of the insulating magnetic core, and the current output ends of two adjacent windings are located on the second surface of the insulating magnetic core, and the first surface and the second surface are arranged opposite to each other.

[0023] Optionally, current directions of two windings adjacent to each other in the first direction are the same.

[0024] Optionally, the current input terminals and the current output terminals of two adjacent windings are both located on the same surface side of the insulating magnetic core.

[0025] Optionally, the insulating magnetic core, the winding and the non-magnetic insulating layer are an integrally formed structure; the material of the non-magnetic insulating part is at least one of mica, ceramic and alumina.

[0026] In the technical solution provided by the embodiment of the utility model, at least two grooves are arranged in the insulating core, and at least two grooves are arranged at intervals along the first direction; at least two windings are located in the grooves in a one-to-one correspondence, and the insulating core also includes at least one accommodating hole extending in the second direction, located between two adjacent grooves, and the two adjacent grooves arranged in the first direction are connected by an accommodating hole; the non-magnetic insulating layer is located in the accommodating hole, and the non-magnetic insulating layer is located in the accommodating hole, and the coupling coefficient between the two windings is related to the thickness of the non-magnetic insulating layer located between the two windings in the third direction. The embodiment of the utility model can avoid short circuits between two adjacent windings through the insulating core and the non-magnetic insulating layer between the two adjacent windings, and the coupling coefficient between the two windings is related to the thickness of the non-magnetic insulating layer located between the two windings in the third direction, so the coupling coefficient of the two windings can be improved by changing the thickness of the non-magnetic insulating layer. And the non-magnetic insulating layer is arranged between the two adjacent windings to increase the mutual inductance of the two windings, thereby enhancing the energy storage capacity and anti-saturation performance.

[0027] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of a coupled inductor device provided by an embodiment of the utility model;

[0030] Figure 2 yes Figure 1 The structural cross-section of one winding in the A1-A2 direction;

[0031] Figure 3 It is a diagram showing the relationship between the thickness of the non-magnetic insulating layer and the coupling coefficient provided by the embodiment of the utility model;

[0032] Figure 4 yes Figure 1 Structural cross-section of the coupled inductor in the B1-B2 direction;

[0033] Figure 5 It is a structural schematic diagram of another coupled inductor device provided by an embodiment of the utility model;

[0034] Figure 6 yes Figure 5 Structural cross-section of the coupled inductor in the C1-C2 direction;

[0035] Figure 7 yes Figure 5 The structural cross-section of a winding in the D1-D2 direction;

[0036] Figure 8 It is a flow chart of a method for preparing an integrally formed coupled inductor device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Figure 1 It is a structural schematic diagram of a coupled inductor device provided in an embodiment of the utility model. Figure 2 yes Figure 1 Structural cross-section of a winding in the A1-A2 direction. Figure 3 It is a diagram showing the relationship between the thickness of the non-magnetic insulating layer and the coupling coefficient provided by the embodiment of the present invention. Figure 4 yes Figure 1 The structural cross-section of the coupled inductor device in the B1-B2 direction. Figure 1-Figure 2 The coupled inductor device comprises: an insulating magnetic core 1, wherein at least two grooves 10 are arranged in the insulating magnetic core 1, and the at least two grooves 10 are arranged at intervals along a first direction X; at least two windings 2, and the windings 2 are arranged in the grooves 10 in a one-to-one correspondence; the insulating magnetic core 1 also comprises at least one accommodating hole 3, and the accommodating hole 3 extends in a second direction Y, and is located between two adjacent grooves 10, and two adjacent grooves 10 arranged in the first direction X are connected by an accommodating hole 3, and the second direction Y and the first direction X are arranged to intersect; a third direction Z is perpendicular to the second direction Y and perpendicular to the first direction X; a non-magnetic insulating layer 4, and the non-magnetic insulating layer 4 is located in the accommodating hole 3, and the coupling coefficient between the two windings 2 is related to the thickness of the non-magnetic insulating layer 4 located between the two windings 2 in the third direction Z.

[0040] Among them, see Figure 1 , the groove 10 includes a first sub-groove 11, a second sub-groove 12 and a third sub-groove 13. X represents the first direction, Y represents the second direction, and Z represents the third direction. Figure 4 The interval between the two grooves 10 along the first direction X is equal to the width of the receiving hole 3, and the depth of the groove 10 is less than the depth of the insulating magnetic core 1. Figure 2 The winding 2 includes a first connecting portion 20, a second connecting portion 21 and a main body 22. The winding 2 can be a coil or a conductive sheet. The material used is preferably copper. The thickness of the winding 2 is 0.5 mm, and there is no need to cover the surface of the winding 2 with insulating material.

[0041] Specifically, when at least two windings 2 are powered on or off, a magnetic field will be generated around each winding 2. The magnetic field generated by each winding 2 will be coupled with the magnetic field generated by its adjacent winding 2. Each winding 2 will generate an induced current under the magnetic field generated by the adjacent winding 2. Since the insulating magnetic core 1 and the non-magnetic insulating layer 4 between each winding 2 have the characteristics of high temperature resistance and good insulation, short circuit between two adjacent windings 2 can be avoided.

[0042] When the spacing between at least two windings 2 along the first direction X is too small, the coupling coefficient between the two adjacent windings 2 is high, and there is no need to adjust the coupling coefficient between the two adjacent windings 2 by changing the thickness of the non-magnetic insulating layer 4. When the spacing between at least two windings 2 along the first direction X is large, the magnetic field generated by the two windings 2 propagates along the first path 15, and the thickness of the non-magnetic insulating layer 4 is gradually increased to increase the magnetic resistance of the non-magnetic insulating layer 4, thereby preventing the magnetic field from passing between the two adjacent windings 2, that is, the magnetic field generated by the winding 2 propagates along the second path 16, thereby increasing the coupling between the two adjacent windings 2.

[0043] For example, see Figure 3 When the thickness of the non-magnetic insulating layer 4 increases from 0.01 mm to 1.0 mm, the coupling coefficient increases from 0.003 to 0.57. As the thickness of the non-magnetic insulating layer 4 increases, the coupling coefficient gradually increases. Therefore, increasing the thickness of the non-magnetic insulating layer 4 can increase the coupling coefficient between two adjacent windings 2.

[0044] Table 1 is the relationship between the thickness of the non-magnetic insulating layer and the coupling coefficient

[0045] Non-magnetic insulation layer thickness Coupling coefficient 0.1mm 0.24 0.25mm 0.4 0.5mm 0.54 0.8mm 0.56 1.0mm 0.57

[0046] When the thickness of the non-magnetic insulating layer 4 is 0.1 mm, the coupling coefficient is 0.24; when the thickness of the non-magnetic insulating layer 4 is 0.25 mm, the coupling coefficient is 0.4; when the thickness of the non-magnetic insulating layer 4 is 0.5 mm, the coupling coefficient is 0.54; when the thickness of the non-magnetic insulating layer 4 is 0.8 mm, the coupling coefficient is 0.56; when the thickness of the non-magnetic insulating layer 4 is 1.0 mm, the coupling coefficient is 0.57.

[0047] In the technical solution provided by the embodiment of the utility model, at least two grooves 10 are arranged in the insulating core 1, and the at least two grooves 10 are arranged at intervals along the first direction X; at least two windings 2 are located in the grooves 10 in a one-to-one correspondence, and the insulating core 1 also includes at least one accommodating hole 3 extending in the second direction Y, located between two adjacent grooves 10, and the two adjacent grooves 10 arranged in the first direction X are connected by an accommodating hole 3; a non-magnetic insulating layer 4, the non-magnetic insulating layer 4 is located in the accommodating hole 3, and the coupling coefficient between the two windings 2 is related to the thickness of the non-magnetic insulating layer 4 located between the two windings 2 in the third direction Z. The embodiment of the utility model can avoid short circuits between two adjacent windings 2 through the insulating core 1 and the non-magnetic insulating layer 4 between the two adjacent windings 2, and the coupling coefficient between the two windings 2 is related to the thickness of the non-magnetic insulating layer 4 located between the two windings 2 in the third direction Z, so the coupling coefficient of the two windings 2 can be increased by changing the thickness of the non-magnetic insulating layer 4, thereby increasing the inductive charge of the two windings 2, thereby enhancing the energy storage capacity and anti-saturation performance.

[0048] See also Figure 1 Based on the above embodiments, optionally, the high temperature resistance range of the insulating magnetic core is greater than or equal to 600°C and less than or equal to 850°C; and / or the high temperature resistance range of the non-magnetic insulating layer is greater than or equal to 600°C and less than or equal to 850°C.

[0049] Among them, 600℃-850℃ is a high temperature annealing for preparing coupled inductor devices. High temperature annealing is a process for preparing coupled inductor devices. The magnetic material used in the insulating magnetic core 1 includes but is not limited to iron silicon aluminum and iron nickel materials. The magnetic material is a material with high temperature resistance, strong magnetism and good insulation. The material used in the non-magnetic insulating layer 4 includes but is not limited to mica, ceramics and aluminum oxide. The non-magnetic material has the performance of high temperature resistance, weak magnetism and good insulation.

[0050] Specifically, when preparing a coupled inductor device at 600℃-850℃, it is necessary to ensure that the materials used for the insulating core 1 and the non-magnetic insulating layer 4 are not easily damaged at a temperature of 600℃-850℃. Therefore, at a temperature of 600℃-850℃, the insulating core 1 and the non-magnetic insulating layer 4 still have good insulation properties, thereby avoiding a short circuit between the two windings 2.

[0051] Continue to see Figure 1 and Figure 2 On the basis of the above embodiment, optionally, the groove 10 includes a first sub-groove 11, a second sub-groove 12 and a third sub-groove 13 which are connected; the first sub-groove 11 extends from the inside of the insulating magnetic core 1 to the surface of the insulating magnetic core 1, the second sub-groove 12 extends from the inside of the insulating magnetic core 1 to the surface of the insulating magnetic core 1, and the third sub-groove 13 is located in the insulating magnetic core 1 and connects the first sub-groove 11 and the second sub-groove 12; the winding 2 includes a first connecting portion 20, a main body 22 and a second connecting portion 21, the first connecting portion 20 is located in the first sub-groove 11, the second connecting portion 21 is located in the second sub-groove 12, and the main body 22 is located in the third sub-groove 13; the first connecting portion 20 serves as a current input terminal, and the second connecting portion 21 serves as a current output terminal, or the first connecting portion 20 serves as a current output terminal, and the second connecting portion 21 serves as a current input terminal.

[0052] The thickness T1 of the first connecting portion 20 is the same as the thickness T2 of the second connecting portion 21, and the thickness of the main body 22 is T. Figure 1 When current is input from the first connection part 20 of the two windings 2 and output from the second connection part 20, the current passes through the first connection part 20 to reach the main body 22, so that the current flows in the same direction through the main body 22 of the two windings 2.

[0053] Figure 5 Schematic diagram of another coupled inductor device provided by the embodiment of the utility model. Figure 5 When current is input from the second connection portion 21 and output from the first connection portion 20 , the current flows in opposite directions through the main portions 22 of the two windings 2 .

[0054] In the embodiment of the utility model, by setting the first connecting part 20 in the first sub-groove 11, the second connecting part 21 in the second sub-groove 12 and the main body 22 in the third sub-groove 13, the winding 2 and the insulating magnetic core 1 are tightly combined to form a shielding structure with strong vibration resistance, noise avoidance and strong anti-electromagnetic interference capability. At the same time, the first connecting part 20 is used as a current input terminal and the second connecting part 21 is used as a current output terminal, or the first connecting part 20 is used as a current output terminal and the second connecting part 21 is used as a current input terminal to realize power supply for external devices.

[0055] See also Figure 1 and 2 Optionally, based on the above embodiment, the thickness of the non-magnetic insulating layer 4 in the third direction Z is greater than or equal to 0.01 mm and less than or equal to twice the thickness T of the main body 22 .

[0056] Among them, see Figure 2 , the thickness T of the main body 2 is the thickness of the winding 2.

[0057] In the embodiment of the present utility model, the thickness of the non-magnetic insulating layer 4 increases, and the coupling coefficient between the two windings 2 increases.

[0058] Figure 6 yes Figure 5 The structural cross-section of the coupled inductor device in the C1-C2 direction. Figure 5 and Figure 6 In a groove 10 , the first sub-groove 11 and the second sub-groove 12 extend from the inside of the insulating magnetic core 1 to two oppositely disposed surfaces of the insulating magnetic core 1 ; the first connecting portion 20 and the second connecting portion 21 are located on the two oppositely disposed surface sides of the insulating magnetic core 1 .

[0059] The thickness T1 of the first connecting portion 20 , the thickness T2 of the second connecting portion 21 , and the thickness T of the main body are equal to the thickness of the insulating magnetic core 1 .

[0060] In the embodiment of the utility model, by arranging the first connection part 20 and the second connection part 21 on two oppositely disposed surface sides, it is possible to power external devices located on two oppositely disposed surface sides of the insulating magnetic core 1 .

[0061] Continue to see Figure 1 Based on the above embodiment, optionally, in one groove, the first sub-groove 11 and the second sub-groove 12 extend from inside the insulating magnetic core 1 to the same surface of the insulating magnetic core 1; the first connecting portion 20 and the second connecting portion 21 are located on the same surface side of the insulating magnetic core 1.

[0062] In the embodiment of the utility model, by arranging the first connection part 20 and the second connection part 21 on the same surface side of the insulating magnetic core 1 , it is possible to power an external device located on the same surface side of the insulating magnetic core 1 .

[0063] Figure 7 yes Figure 5 The structural cross-section of a winding in the D1-D2 direction. Figure 7 , based on the above embodiment, optionally, the current directions of two windings 2 adjacently arranged in the first direction are opposite.

[0064] Among them, see Figure 7 , the thickness T of the main body 22 is the thickness of the winding 2. Specifically, the first connection portion 20 is used as the input end of the current, and the second connection portion 21 is used as the output end of the current, and the current directions of the two adjacent windings 2 in the first direction X are opposite. This arrangement realizes power supply for external devices in the vertical direction.

[0065] Continue to see Figure 5 Based on the above embodiment, optionally, the current input ends of two adjacent windings 2 are located on the first surface of the insulating core 1, and the current output ends of two adjacent windings 2 are located on the second surface of the insulating core 1, and the first surface and the second surface are arranged opposite to each other.

[0066] In the embodiment of the utility model, the current input ends of two adjacent windings 2 are arranged on the first surface of the insulating magnetic core 1, and the current output ends of two adjacent windings 2 are arranged on the second surface of the insulating magnetic core 1. It is achieved to power the external device arranged on the second surface of the insulating magnetic core 1.

[0067] Continue to see Figure 1 Based on the above embodiment, optionally, the current directions of two windings 2 adjacently arranged in the first direction X are the same.

[0068] Specifically, the first connection portion 20 is used as an input end of the current, and the second connection portion 21 is used as an output end of the current, and the current directions of two adjacent windings 2 in the first direction X are the same.

[0069] Continue to see Figure 1 Based on the above embodiment, optionally, the current input end and the current output end of two adjacent windings 2 are both located on the same surface side of the insulating magnetic core 1 .

[0070] In the embodiment of the utility model, by arranging the current input terminals and the current output terminals of two adjacent windings 2 on the same surface side of the insulating magnetic core, power is supplied to the external devices arranged on the same surface side of the insulating magnetic core.

[0071] Continue to see Figure 1On the basis of the above embodiment, optionally, the insulating magnetic core 1, the winding 2 and the non-magnetic insulating layer 4 are integrally formed; the material of the non-magnetic insulating member is at least one of mica, ceramic and alumina. That is, the coupled inductor is an integrally formed coupled inductor, which is formed by putting the insulating magnetic powder constituting the insulating magnetic core 1, the winding 2 and the non-magnetic insulating layer 4 into a mold cavity and pressing them together.

[0072] It is understandable that in other embodiments, the insulating magnetic core 1 may include a pre-pressed first insulating magnetic core and a second insulating magnetic core. A groove 10 and a receiving hole 3 are pre-formed on the pre-pressed first insulating magnetic core and / or the second insulating magnetic core, and the winding 2 and the non-magnetic insulation 4 layers are respectively arranged in the groove 10 and the receiving hole 3, and the first insulating magnetic core and the second insulating magnetic core are combined to form a coupled inductor device.

[0073] Figure 8 This is a flow chart of a method for preparing an integrally formed coupled inductor device provided by an embodiment of the utility model. Figure 8 , specifically including the following steps:

[0074] S110. Provide an insulating magnetic core, wherein the insulating magnetic core comprises a first portion of insulating magnetic core powder and a second portion of insulating magnetic core powder separated from each other.

[0075] S120, placing at least two windings on the first portion of insulating magnetic core powder, wherein the windings are spaced apart along a first direction.

[0076] S130, placing a non-magnetic insulating layer between two adjacent windings, wherein the non-magnetic insulating layer extends along the second direction, and two adjacent windings in the first direction are connected by a non-magnetic insulating layer, and the second direction and the first direction are arranged to intersect.

[0077] S140, covering the winding and the non-magnetic insulating layer with the second portion of insulating magnetic core powder; wherein the second portion of insulating magnetic core powder and the first portion of insulating magnetic core powder completely cover the winding and the non-magnetic insulating layer.

[0078] S150, forming an integrally formed structure by pressing the first portion insulating magnetic core powder, at least two windings, a non-magnetic insulating layer and the second portion insulating magnetic core powder.

[0079] Specifically, after at least two windings are pressed together with the first division insulating magnetic core powder and the second division insulating magnetic core powder, they have at least two grooves therein, and the windings are located in the grooves one by one. After the first division insulating magnetic core powder and the second division insulating magnetic core are pressed together, they also have at least one accommodating hole therein, and the accommodating hole extends in the second direction, and the accommodating hole is located between two adjacent grooves, and two adjacent grooves arranged in the first direction are connected by a accommodating hole, and the non-magnetic insulating layer is located in the accommodating hole.

[0080] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0081] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A coupled inductor device, characterized in that: include: An insulating magnetic core, wherein at least two grooves are arranged in the insulating magnetic core, and the at least two grooves are arranged at intervals along a first direction; at least two windings, the windings being located in the grooves in a one-to-one correspondence; The insulating magnetic core further includes at least one accommodating hole, the accommodating hole extends in the second direction and is located between two adjacent grooves, and two adjacent grooves arranged in the first direction are connected by the accommodating hole, and the second direction and the first direction are arranged to intersect; a non-magnetic insulating layer, wherein the non-magnetic insulating layer is located in the receiving hole; The coupling coefficient between the two windings is related to the thickness of the non-magnetic insulating layer between the two windings in the third direction; The third direction is perpendicular to the second direction and perpendicular to the first direction.

2. The coupled inductor device according to claim 1, characterized in that: The high temperature resistance range of the insulating magnetic core is greater than or equal to 600°C and less than or equal to 850°C; And / or, the non-magnetic insulating layer has a high temperature resistance range greater than or equal to 600°C and less than or equal to 850°C.

3. The coupled inductor device according to claim 1, characterized in that: The groove comprises a first sub-groove, a second sub-groove and a third sub-groove that are connected; The first sub-groove extends from the inside of the insulating magnetic core to the surface of the insulating magnetic core, the second sub-groove extends from the inside of the insulating magnetic core to the surface of the insulating magnetic core, and the third sub-groove is located in the insulating magnetic core and connects the first sub-groove and the second sub-groove; The winding comprises a first connection portion, a main body portion and a second connection portion, the first connection portion is located in the first sub-groove, the second connection portion is located in the second sub-groove, and the main body portion is located in the third sub-groove; The first connection portion is used as a current input terminal, and the second connection portion is used as a current output terminal, or the first connection portion is used as a current output terminal, and the second connection portion is used as a current input terminal.

4. The coupled inductor device according to claim 3, characterized in that: The thickness of the non-magnetic insulating layer in the third direction is greater than or equal to 0.01 mm and less than or equal to twice the thickness of the main body.

5. The coupled inductor device according to claim 3, characterized in that: In one of the grooves, the first sub-groove and the second sub-groove extend from inside the insulating magnetic core to two oppositely disposed surfaces of the insulating magnetic core; The first connection portion and the second connection portion are located on two oppositely disposed surface sides of the insulating magnetic core.

6. The coupled inductor device according to claim 3, characterized in that: In one of the grooves, the first sub-groove and the second sub-groove extend from inside the insulating magnetic core to the same surface of the insulating magnetic core; The first connection portion and the second connection portion are located on the same surface side of the insulating magnetic core.

7. The coupled inductor device according to claim 5, characterized in that: The current directions of the two windings adjacently arranged in the first direction are opposite.

8. The coupled inductor device according to claim 7, characterized in that: The current input ends of two adjacent windings are located on the first surface of the insulating magnetic core, and the current output ends of two adjacent windings are located on the second surface of the insulating magnetic core. The first surface and the second surface are arranged opposite to each other.

9. The coupled inductor device according to claim 6, characterized in that: The current directions of two windings adjacently arranged in the first direction are the same.

10. The coupled inductor device according to claim 9, characterized in that: The current input terminals and the current output terminals of two adjacent windings are both located on the same surface side of the insulating magnetic core.

Images