Inductive structure and power supply circuit

Abstract

The application provides an inductance structure and a power supply circuit, comprising: at least one magnetic core and N groups of windings, each group of the windings comprising one phase output coil and one phase-to-phase coupling coil; the magnetic core is provided with a through hole, the phase output coil and the phase-to-phase coupling coil of each group of the windings pass through the same through hole and are respectively arranged on both sides of the through hole, at least one group of the windings is arranged on one magnetic core, each phase-to-phase coupling coil is located on the same side of the magnetic core, each phase output coil is located on the other side of the magnetic core, and the phase output coil and the phase-to-phase coupling coil are insulatively arranged; wherein N is a natural number greater than or equal to 2. The magnetic core of the inductance structure adopts a magnetic powder core material, and the negative coupling between multiple inductances is realized through an indirect coupling mode, and the inductance structure has the advantages of fast transient response speed, small inductance size, strong heat dissipation capacity and the like for large current application.

Description

Technical Field

[0001] This invention relates to the field of semiconductor technology, and in particular to an inductor structure and a power supply circuit. Background Technology

[0002] High-current, multi-channel parallel connection has become the main structure of voltage regulator modules (VRMs) for powering CPUs, servers, etc., and the inductors used in these modules are mostly multiple ferrite inductors used side by side. Figure 1 The diagram shows a single ferrite inductor 1, with its core 11 made of ferrite material and a coil 12 wound on the core. Due to its low core saturation flux density and low thermal conductivity, it cannot be designed to be smaller; and when multiple ferrite inductors are used in parallel, when the load of one inductor suddenly changes, the other inductors are slow to detect this change, making it difficult to achieve current sharing among the branches.

[0003] Therefore, how to reduce the size of the inductor and achieve current sharing among the branches when multiple circuits are used in parallel has become one of the problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an inductor structure and power supply circuit to solve the problems of large inductor size and slow sensing of each branch when multiple circuits are used in parallel in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides an inductor structure comprising:

[0006] At least one magnetic core and N sets of windings, each set of said windings including a phase output coil and a phase-to-phase coupling coil;

[0007] The magnetic core is provided with a through hole. The phase output coil and the phase coupling coil of a set of windings pass through the same through hole and are respectively wound on both sides of the through hole. At least one set of windings is wound on a magnetic core. Each phase coupling coil is located on the same side of the magnetic core, and each phase output coil is located on the other side of the magnetic core. There is an insulation between the phase output coil and the phase coupling coil.

[0008] Where N is a natural number greater than or equal to 2.

[0009] Optionally, the phase-coupled coils are connected in series.

[0010] Alternatively, the phase-coupled coils are connected in series via connecting lines disposed on the surface of the magnetic core.

[0011] Alternatively, the phase-coupled coils are connected in series by welding.

[0012] Optionally, the magnetic core is made of magnetic powder core material.

[0013] Optionally, an insulating sheet is provided inside the through hole, and the phase output coil and the phase coupling coil inside the through hole are located on both sides of the insulating sheet.

[0014] Optionally, the phase output coil and / or the phase coupling coil are externally wrapped with an insulating material layer.

[0015] Alternatively, the linewidth of the phase output coil disposed outside the through hole is greater than the width of the through hole.

[0016] Alternatively, the bottom of the magnetic core is a plane, and the output ends of the phase output coil and the phase coupling coil are attached to the bottom plane of the magnetic core.

[0017] Alternatively, the inductor structure further includes a wire frame through which both the phase output coil and the phase coupling coil pass to fix their relative positions.

[0018] Alternatively, the wire frame includes a fixing member and a plug disposed on the lower surface of the fixing member, the fixing member being disposed outside the through hole and the plug being inserted into the through hole.

[0019] Alternatively, the inductor structure further includes at least one additional coil and an additional through hole corresponding to the additional coil. The additional coil passes through the additional through hole and is wound on the magnetic core. The additional coil and the phase-coupled coil are located on the same side of the magnetic core. One end of the additional coil is connected in series with the input or output end of the phase-coupled coil, and the other end of the additional coil forms a new input or output end.

[0020] To achieve the above and other related objectives, the present invention also provides a power supply circuit, including the aforementioned inductor structure, wherein the power supply circuit further includes:

[0021] Output capacitor and N switching modules;

[0022] One end of each switch module receives the input voltage, and the other end is connected to the first end of the corresponding phase output coil in the inductor structure. The switching control of the power supply is realized based on the conduction and cutoff of the switch. The second end of each phase output coil is connected to the upper plate of the output capacitor. The interphase coupling coils in the inductor structure are connected end to end in sequence.

[0023] Optionally, the switching module includes a first switch and a second switch; the first terminal of the first switch receives the input voltage, and the second terminal is connected to the first terminal of the corresponding phase output coil in the inductor structure; the first terminal of the second switch is connected to the second terminal of the first switch, and the second terminal of the second switch is grounded; the switching states of the first switch and the second switch are opposite.

[0024] Alternatively, the power supply circuit may further include a compensation inductor connected in series between any two phase-to-phase coupling coils.

[0025] As described above, the inductor structure and power supply circuit of the present invention have the following beneficial effects:

[0026] The magnetic core of the inductor structure of this invention is made of magnetic powder core material, and negative coupling between multiple inductors is achieved through indirect coupling. It has the advantages of fast transient response speed for high current applications, small inductor size, and strong heat dissipation capability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a ferrite inductor in the prior art;

[0028] Figure 2 This is a schematic diagram of the first possible structure of the inductor structure of the present invention;

[0029] Figure 3 for Figure 2 A cross-sectional schematic diagram of the inductor structure;

[0030] Figure 4 for Figure 2 A schematic diagram of the bottom structure of the inductor;

[0031] Figure 5 This is a schematic diagram of a second structure of the inductor structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the power supply circuit of the present invention;

[0033] Figure 7 This is a schematic diagram of the third structure of the inductor structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the fourth structure of the inductor structure of the present invention;

[0035] Figure 9 This is a schematic diagram of the fifth possible structure of the inductor structure of the present invention;

[0036] Figure 10 This is a schematic diagram of the sixth possible structure of the inductor structure of the present invention;

[0037] Figure 11This is a schematic diagram of the seventh structure of the inductor structure of the present invention.

[0038] Component designation explanation

[0039] 1 Ferrite Inductor

[0040] 11 Magnetic Core

[0041] 12 coils

[0042] 2. Inductor Structure

[0043] 21 magnetic cores

[0044] 22 windings

[0045] 221-phase output coil

[0046] 222 interphase coupling coil

[0047] 22a First Winding

[0048] 221a First Phase Output Coil

[0049] 222a First phase coupling coil

[0050] 22b Second Winding

[0051] 221b Second Phase Output Coil

[0052] 222b Second phase coupling coil

[0053] 23 Insulating sheet

[0054] 24 Connecting wires

[0055] 25 Wireframe

[0056] 251 Fastener

[0057] 252 Plugin

[0058] 26 Additional coil

[0059] 31 First Switch Module

[0060] 32 Second Switch Module

[0061] 4. Compensating inductor Detailed Implementation

[0062] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0063] Please see Figures 2 to 11 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0064] Example 1

[0065] like Figure 2 As shown, this embodiment provides an inductor structure 2, which includes:

[0066] The system includes at least one magnetic core 21 and N sets of windings, each set of windings comprising a phase output coil 221 and a phase-to-phase coupling coil 222; wherein N is a natural number greater than or equal to 2. In this embodiment, N is set to 2, but in actual use, the value of N can be set as needed.

[0067] like Figure 2 As shown, the magnetic core 21 is used to wind the coil.

[0068] Specifically, the magnetic core 21 is made of magnetic powder core material, which is a soft magnetic material formed by mixing and pressing ferromagnetic powder particles with an insulating medium. It has a much higher saturation magnetic flux density and lower thermal conductivity than ferrite. As an example, the magnetic core 21 has a cubic structure.

[0069] It should be noted that, in actual use, the shape of the magnetic core can be set as needed and is not limited to this embodiment.

[0070] like Figure 2 As shown, the through hole is disposed on the magnetic core 21.

[0071] Specifically, in this embodiment, there are two through holes. Figure 3 As shown, each through hole extends from top to bottom through the magnetic core 21; as an example, the cross-section of the through hole is rectangular.

[0072] It should be noted that, in actual use, the cross-sectional shape of the through hole can be set as needed, and is not limited to this embodiment.

[0073] like Figure 2 As shown, the phase output coil and the phase coupling coil of a set of windings both pass through the same through hole and are respectively wound on both sides of the through hole. At least one set of windings is wound on a magnetic core 21. Each phase coupling coil is located on the same side of the magnetic core 21, and each phase output coil is located on the other side of the magnetic core 21. There is an insulation between the phase output coil and the phase coupling coil.

[0074] Specifically, in this embodiment, two sets of windings are provided, namely a first winding 22a and a second winding 22b. The first winding 22a includes a first phase output coil 221a and a first phase-to-phase coupling coil 222a, and the second winding 22b includes a second phase output coil 221b and a second phase-to-phase coupling coil 222b. The first winding 22a and the second winding 22b are respectively arranged side by side in two through holes, and the phase output coil and the phase-to-phase coupling coil of the same set of windings pass through the same through hole.

[0075] More specifically, in this embodiment, the phase output coil 221 and the interphase coupling coil 222 in each winding group are all configured in a U-shape according to the shape of the magnetic core 21; such as Figure 3 As shown, both the phase output coil 221 and the phase coupling coil 222 include a first line segment disposed in the through hole, a second line segment disposed on the upper surface of the magnetic core 21, and a third line segment attached to the sidewall of the magnetic core 21. Further, as an example, the second line segments of the phase output coil 221 and the phase coupling coil 222 are arranged parallel to each other. In actual use, the shapes of the phase output coil 221 and the phase coupling coil 222 can be determined based on the magnetic core 21, and will not be elaborated here.

[0076] It should be noted that, as Figure 3 As shown, in this embodiment, there is a gap between the second segment of the phase-to-phase coupling coil 222 and the magnetic core 21. The first and third segments of both the phase output coil 221 and the phase-to-phase coupling coil 222 are provided with extensions protruding from the lower surface of the magnetic core 21. These extensions serve as output terminals for electrical connection.

[0077] More specifically, as an example, the first winding 22a and the second winding 22b are oriented in the same direction; the first phase output coil 221a and the second phase output coil 221b are located on the same side, and the first interphase coupling coil 222a and the second interphase coupling coil 222b are located on the other side. When the interphase coupling coils need to be connected in series, they can be connected sequentially on the PCB by soldering; alternatively, they can be connected in series directly during winding formation, such as... Figure 4As shown, the bottom of the magnetic core 21 is also provided with a connecting line 24 (the connecting line 24 can be obtained in the winding forming process) for connecting the interphase coupling coils in series. The interphase coupling coils connected in series form a negative coupling with each phase output coil, and the coupling coefficient is greater than 0.5.

[0078] It should be noted that the forming process of the magnetic core 21 includes, but is not limited to, the magnetic powder core assembly process after high-temperature sintering and the integral forming process in which the winding magnetic core is directly pressed together. Among these, Figure 2 and Figure 4 It is a one-piece molding process. Figure 5 This refers to the magnetic powder core assembly process.

[0079] More specifically, such as Figure 3 As shown, in this embodiment, an insulating sheet 23 is provided inside the through hole. The phase output coil 221 and the phase-to-phase coupling coil 222 inside the through hole are located on both sides of the insulating sheet 23, thereby achieving insulation between the phase output coil 221 and the phase-to-phase coupling coil 222. In another implementation, the phase output coil 221 and / or the phase-to-phase coupling coil 222 are wrapped with an insulating material layer to achieve insulation between them. As an example, the phase output coil 221 and the phase-to-phase coupling coil 222 are made of enameled flat wire, which directly serves as insulation between the windings. Any method that can achieve insulation between the phase output coil 221 and the phase-to-phase coupling coil 222 is applicable to this invention.

[0080] like Figure 6 As shown, this embodiment also provides a power supply circuit, which includes an inductor structure with two sets of windings, two switching modules, and an output capacitor Cout. One end of each switching module receives the input voltage, and the other end is connected to the first end of the corresponding phase output coil in the inductor structure, thereby realizing the switching control of the power supply based on the on and off states of the switches. The second end of each phase output coil is connected to the upper plate of the output capacitor. The interphase coupling coils in the inductor structure are connected end to end in sequence.

[0081] Specifically, each switch module includes a first switch and a second switch. The first terminal of the first switch receives the input voltage, and the second terminal is connected to the first terminal of the corresponding phase output coil in the inductor structure. The first terminal of the second switch is connected to the second terminal of the first switch, and the second terminal is grounded. The switching states of the first switch and the second switch are opposite. Each switch module has its own corresponding switch control signal. In this embodiment, one terminal of the first switch S11 in the first switch module 31 receives the input voltage Vin, and the other terminal is connected to one terminal of the first phase output coil 221a in the inductor structure. The other terminal of the first phase output coil 221a is connected to the upper plate of the output capacitor Cout. The lower plate of the output capacitor Cout is grounded. One terminal of the second switch S21 in the first switch module 31 is connected to the connection node between the first switch S11 and the first phase output coil 221a, and the other terminal is grounded. In the first switch module 31, when the first switch S11 is turned on, the second switch S21 is turned off, and when the first switch S11 is turned off, the second switch S21 is turned on. In the second switch module 32, one end of the first switch S12 receives the input voltage Vin, and the other end is connected to one end of the second phase output coil 221b in the inductor structure; the other end of the second phase output coil 221b is connected to the upper plate of the output capacitor Cout; one end of the second switch S22 in the second switch module 32 is connected to the connection node between the first switch S12 and the second phase output coil 221b, and the other end is grounded; in the second switch module 32, if the first switch S12 is on, the second switch S22 is off, and if the first switch S12 is off, the second switch S22 is on. In the inductor structure, the first interphase coupling coil 222a and the second interphase coupling coil 222b are connected in series.

[0082] Specifically, as another example, the power supply circuit further includes a compensation inductor 4 connected between the first phase-to-phase coupling coil 222a and the second phase-to-phase coupling coil 222b. The compensation inductor 4 may be omitted when the negative coupling effect of the first phase-to-phase coupling coil 222a and the second phase-to-phase coupling coil 222b on the first phase output coil 221a and the second phase output coil 221b meets the application requirements.

[0083] It should be noted that this embodiment is based on a two-way interleaved parallel BUCK circuit. In actual use, the number of parallel paths and the circuit structure of the switching module can be set as needed, and are not limited to this embodiment.

[0084] Specifically, based on the power supply circuit described in this embodiment, the following can be obtained:

[0085] L1=L2=L

[0086] M 13 =M 31=M 23 =M 32 =M

[0087] M 12 =M 21 =M s

[0088]

[0089] Wherein, L1 is the self-inductance of the first phase output coil 221a; L2 is the self-inductance of the second phase output coil 221b; M13 and M31 are the mutual inductances between the first phase output coil 221a and the series-connected interphase coupling coil; M23 and M32 are the mutual inductances between the second phase output coil 221b and the series-connected interphase coupling coil; M12 and M21 are the mutual inductances between the first phase output coil 221a and the second phase output coil 221b; Va is the voltage across the second terminal of the first switching module 31. Vb is the voltage at the second terminal of the second switching module 32; Vo is the voltage at the upper plate of the output capacitor; i1 is the current flowing through the first phase output coil 221a; i2 is the current flowing through the second phase output coil 221b; ic is the current flowing through the compensation inductor 4, the first phase coupling coil 222a and the second phase coupling coil 222b connected end to end; L3 is the sum of the inductances of the compensation inductor 4, the first phase coupling coil 222a and the second phase coupling coil 222b.

[0090] From the above three equations (1), (2) and (3), the indirect coupling of the two inductors can be reorganized into the voltage relationship between the two ends of a normal two-way directly negatively coupled inductor as follows:

[0091]

[0092]

[0093] Based on equations (4) and (5), it can be seen that when the current of a single inductor changes drastically, the current of the other inductor will also change drastically, thus achieving current sharing among the inductors.

[0094] It should be noted that in actual use, the number of windings can be set as needed, such as... Figure 7 The diagram shows four sets of windings, which will not be described in detail here.

[0095] Example 2

[0096] like Figure 8As shown, this embodiment provides an inductor structure 2, which differs from the first embodiment in that the inductor structure 2 further includes a wire frame 25, through which the phase output coil 221 and the phase coupling coil 222 pass to fix the relative positions of the phase output coil 221 and the phase coupling coil 222, facilitating assembly and installation.

[0097] Specifically, in this embodiment, three sets of windings are used as an example. Each set of windings is located in a corresponding through hole. For specific settings, please refer to Embodiment 1 and Embodiment 2, which will not be repeated here. Each set of windings is fixed in the wire frame 25. The relative position of each coil is determined based on each through hole. The wire frame 25 can be used to install each coil as a whole, which is convenient and quick.

[0098] More specifically, as an example, the wire frame 25 includes a fixing member 251 and inserts 252. The fixing member 251 is disposed outside the through hole. In this embodiment, the fixing member 251 has a cubic structure, and its lower surface is in contact with the upper surface of the magnetic core 21. The fixing member 251 has a through hole for accommodating each coil. The inserts 252 are disposed on the lower surface of the fixing member 251 and inserted into the through hole. In this embodiment, three inserts 252 are included. Each insert 252 has a cubic structure with a through hole running from top to bottom in the middle. The through hole of the insert 252 communicates with the through hole in the fixing member 251. The inserts 252 enclose the phase output coil 221 and the phase coupling coil 222 in the through hole.

[0099] It should be noted that the structure of the wire frame 25 is not limited; any structure that can fix the position of each coil to facilitate assembly and installation is applicable to this invention. In this example, in order to cooperate with the structure of the magnetic core 21, the fixing member is set as a cubic structure. In actual use, the structure of the fixing member is not limited. Similarly, the structure of the plug-in 252 can be set based on its through-hole structure, as long as it can complete the installation, and is not limited to this embodiment.

[0100] It should be noted that the wire frame 25 can be applied to inductor structures with two or more windings, which will not be elaborated here.

[0101] Example 3

[0102] like Figure 9 As shown, this embodiment provides an inductor structure 2, which differs from embodiments one and two in that the line width of the phase output coil 221 disposed outside the through hole is greater than the width of the through hole.

[0103] Specifically, in this embodiment, four sets of windings are used as an example. Each set of windings is located in a corresponding through hole. For the specific arrangement, please refer to Embodiment 1, which will not be repeated here. The line width of each phase output coil 221 (first segment) located inside the through hole is less than or equal to the width of the through hole. In this embodiment, the line width of each phase output coil 221 located inside the through hole is the same as the width of the through hole; the line width of each phase output coil 221 (second segment and / or third segment) located outside the through hole is greater than the width of the through hole. By widening the windings, the DC resistance of the windings can be effectively reduced, and inductor heat dissipation is easier.

[0104] It should be noted that the method of having a line width of the phase output coil 221 located outside the through hole that is greater than the width of the through hole can be applied to inductor structures with two or more windings, which will not be elaborated here.

[0105] Example 4

[0106] like Figure 10 As shown, this embodiment provides an inductor structure 2, which differs from Embodiment 3 in that the bottom of the magnetic core 21 is a plane, and the output ends of the phase output coil 221 and the phase coupling coil 222 are attached to the bottom plane of the magnetic core 21; the welding resistance when the inductor is soldered to the PCB board is reduced by folding the output ends of the phase output coil 221 and the phase coupling coil 222 in reverse.

[0107] It should be noted that the reverse bending method at the output end can be applied to inductor structures with two or more windings, which will not be elaborated here.

[0108] Example 5

[0109] like Figure 11 As shown, this embodiment provides an inductor structure 2, which differs from embodiments one, two, three, and four in that the inductor structure 2 further includes at least one additional coil 26 and an additional through hole corresponding to the additional coil 26. The additional coil 26 passes through the additional through hole and is wound on the magnetic core 21. The additional coil 26 serves as an additional magnetic circuit for adjusting the inductance of the phase-coupled coil, thereby adjusting the coupling coefficient between the phase output coil and the phase-coupled coil.

[0110] Specifically, the number of the additional coils 26 can be set as needed; the positions of the additional coils 26 include, but are not limited to, between each phase-coupled coil 222, between each phase output coil 221, and at both ends of the inductor structure 2, as required by actual needs. In this embodiment, the inductor structure 2 includes two additional coils 26, which are respectively disposed at both ends of the three sets of windings; in order to better adjust the inductance of the phase-coupled coils, the additional coils 26 are located on the same side as each phase-coupled coil 222. As an example, one end of the additional coil is connected in series with the input or output end of the phase-coupled coil, and the other end of the additional coil forms a new input or output end.

[0111] It should be noted that the additional coil 26 can be applied to inductor structures with two or more windings, which will not be elaborated here.

[0112] In summary, this invention provides an inductor structure and power supply circuit, comprising: at least one magnetic core and N sets of windings, each set of windings including a phase output coil and an interphase coupling coil; the magnetic core is provided with a through hole, the phase output coil and the interphase coupling coil of each set of windings pass through the same through hole and are respectively wound on both sides of the through hole, at least one set of windings is wound on a magnetic core, each interphase coupling coil is located on the same side of the magnetic core, each phase output coil is located on the other side of the magnetic core, and there is insulation between the phase output coil and the interphase coupling coil; wherein, N is a natural number greater than or equal to 2. The magnetic core of the inductor structure of this invention uses magnetic powder core material and achieves negative coupling between multiple inductors through indirect coupling, which has advantages such as fast transient response speed for high current applications, small inductor size, and strong heat dissipation capacity. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0113] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An inductor structure, characterized in that, include: At least one magnetic core and N sets of windings, each set of said windings including a phase output coil and a phase-to-phase coupling coil; The magnetic core is provided with a through hole. The phase output coil and the phase coupling coil of a set of windings pass through the same through hole and are respectively wound on both sides of the through hole. At least one set of windings is wound on a magnetic core. Each phase coupling coil is located on the same side of the magnetic core, and each phase output coil is located on the other side of the magnetic core. There is an insulation between the phase output coil and the phase coupling coil. Wherein, N is a natural number greater than or equal to 2, and the interphase coupling coils are connected in series in sequence, and the interphase coupling coils after being connected in series form a negative coupling with each phase output coil.

2. The inductor structure according to claim 1, characterized in that: The phase-coupled coils are connected in series via connecting lines disposed on the surface of the magnetic core.

3. The inductor structure according to claim 1, characterized in that: The phase-coupled coils are connected in series by welding.

4. The inductor structure according to claim 1, characterized in that: The magnetic core is made of magnetic powder core material.

5. The inductor structure according to claim 1, characterized in that: An insulating sheet is provided inside the through hole, and the phase output coil and the phase coupling coil inside the through hole are located on both sides of the insulating sheet.

6. The inductor structure according to claim 1, characterized in that: The phase output coil and / or the phase coupling coil are externally wrapped with an insulating material layer.

7. The inductor structure according to any one of claims 1-6, characterized in that: The linewidth of the phase output coil located outside the through hole is greater than the width of the through hole.

8. The inductor structure according to any one of claims 1-6, characterized in that: The bottom of the magnetic core is flat, and the output ends of the phase output coil and the phase coupling coil are attached to the bottom flat surface of the magnetic core.

9. The inductor structure according to any one of claims 1-6, characterized in that: The inductor structure also includes a wire frame through which both the phase output coil and the phase coupling coil pass to fix their relative positions.

10. The inductor structure according to claim 9, characterized in that: The wire frame includes a fixing member and a plug disposed on the lower surface of the fixing member. The fixing member is disposed outside the through hole, and the plug is inserted into the through hole.

11. The inductor structure according to any one of claims 1-6, characterized in that: The inductor structure further includes at least one additional coil and an additional through hole corresponding to the additional coil. The additional coil passes through the additional through hole and is wound on the magnetic core. The additional coil and the phase-coupled coil are located on the same side of the magnetic core. One end of the additional coil is connected in series with the input or output end of the phase-coupled coil, and the other end of the additional coil forms a new input or output end.

12. A power supply circuit, comprising the inductor structure as described in any one of claims 1-11, characterized in that, The power supply circuit also includes: Output capacitor and N switching modules; One end of each switch module receives the input voltage, and the other end is connected to the first end of the corresponding phase output coil in the inductor structure. The switching control of the power supply is realized based on the conduction and cutoff of the switch. The second end of each phase output coil is connected to the upper plate of the output capacitor. The interphase coupling coils in the inductor structure are connected end to end in sequence.

13. The power supply circuit according to claim 12, characterized in that: The switching module includes a first switch and a second switch; the first terminal of the first switch receives the input voltage, and the second terminal is connected to the first terminal of the corresponding phase output coil in the inductor structure; the first terminal of the second switch is connected to the second terminal of the first switch, and the second terminal of the second switch is grounded; the switching states of the first switch and the second switch are opposite.

14. The power supply circuit according to claim 12 or 13, characterized in that: The power supply circuit also includes a compensation inductor, which is connected in series between any two phase-to-phase coupling coils.

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