Integrated inductor

Abstract

The utility model provides an integrated inductor. The integrated inductor comprises an upper cover and a lower cover which are parallel to each other; one end of each middle column is in contact with the upper cover, and the other end of each middle column is in contact with the lower cover; the first part of each side column is in contact with the upper cover, the second part of each side column is in contact with the lower cover, and the first part is far away from the second part; any two adjacent side columns in the N + 1 side columns are separated by one of the N middle columns; the N main windings are arranged on the N middle columns in a one-to-one correspondence mode, and N is an integer larger than or equal to 3; the auxiliary windings are arranged on the side columns; the volume of the side columns is smaller than that of the middle column, and the magnetic conductivity of the side columns is larger than that of the middle column. The problem that a multi-phase inductor structure is too high in cost, size and weight is solved, the cost of the power converter is reduced, and the power density is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of integrated inductors, and in particular, relates to an integrated inductor. Background Art

[0002] With the rapid development of the photovoltaic and new energy industries, products are urgently developing towards miniaturization, lightness, and easier assembly. Inverters play important functions such as AC / DC conversion in photovoltaic and energy storage systems, and therefore continuously put forward higher requirements for the design of magnetic devices. At present, the mainstream inverters in the industry mostly use single inductor solutions on the inverter side. For example, a three-phase inverter uses three-way inverter inductors placed independently. However, the three-way inverter inductors placed independently occupy a large volume and have high losses, which affects the power density of the three-phase inverter. The weight is also high, which affects the difficulty of assembly, resulting in relatively high costs for inductor materials and installation of the entire machine. Utility Model Content

[0003] The embodiments of the present application provide an integrated inductor to solve the problems of excessive cost, volume and weight of a multi-phase inductor structure, thereby reducing the cost of a power converter and improving its power density.

[0004] In a first aspect, the present application provides an integrated inductor, comprising: an upper cover and a lower cover parallel to each other; N middle columns, one end of each middle column contacts the upper cover, and the other end contacts the lower cover; N+1 side columns, a first portion of each side column contacts the upper cover, a second portion contacts the lower cover, and the first portion is away from the second portion; any two adjacent side columns among the N+1 side columns are separated by one of the N middle columns; N main windings, the N main windings are arranged on the N middle columns one by one, and N is an integer greater than or equal to 3; auxiliary windings, the auxiliary windings are arranged on the side columns; the volume of the side columns is smaller than the volume of the middle column, and the magnetic permeability of the side columns is greater than the magnetic permeability of the middle column.

[0005] In one possible implementation, the magnetic permeability of the side pillars is of a different order of magnitude from the magnetic permeability of the middle pillar.

[0006] In one possible implementation, the magnetic permeability of the side columns is on the order of thousands, and the magnetic permeability of the middle column is on the order of tens.

[0007] In a possible implementation, the number of auxiliary windings is N groups, the N groups of auxiliary windings correspond one to one to the N middle columns, and each group of auxiliary windings is arranged on two side columns adjacent to the middle column.

[0008] In a possible implementation, a group of auxiliary windings includes two auxiliary windings, and the two auxiliary windings are respectively arranged on two side poles adjacent to the middle pole.

[0009] In one possible implementation, the N+1 side columns include two target side columns and N-1 non-target side columns, the target side columns are the side columns on both sides of the N+1 side columns, the non-target side columns are the side columns that are not target side columns among the N+1 side columns, and the first number of turns of the auxiliary winding on the target side column is different from the second number of turns of the auxiliary winding on the non-target side column.

[0010] In a possible implementation, the first number of turns is greater than the second number of turns.

[0011] In a possible implementation, the number of the auxiliary windings is two, and the two auxiliary windings are respectively arranged on the side columns at both sides of the N+1 side columns.

[0012] In a possible implementation, an air gap is provided on each center column.

[0013] In a possible implementation, the winding direction of the auxiliary winding is opposite to the winding direction of the main winding.

[0014] The integrated inductor provided by the embodiments of the present application includes but is not limited to the following technical effects:

[0015] The integrated inductor reduces the volume of the magnetic core by sharing the side columns, upper cover and lower cover, and by using high magnetic permeability side columns for splicing, a higher inductance can be achieved in a smaller side column volume, so as to meet the circuit inductance requirements in a smaller volume. In addition, the magnetic flux loop of each main winding can be constrained by the side columns, so that the main windings are uncoupled or weakly coupled. By setting auxiliary windings on the side columns, the inductance of each phase can be adjusted more flexibly, and the multi-phase inductance can be balanced through the weak coupling relationship between the auxiliary windings and the main windings. In this way, the total volume of the inductor can be reduced, the weight can be reduced, the cost can be reduced, and the core loss can be reduced, the power density of the whole machine can be improved, and the volume of the inductor aluminum shell can be reduced, finally achieving the purpose of reducing the volume, weight and cost of the whole machine and reducing the difficulty of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an integrated inductor structure provided in an embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of an integrated inductor decomposition provided in an embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the position relationship of magnetic columns of an integrated inductor provided in an embodiment of the present application.

[0019] Figure 4 This is a schematic diagram of an upper cover structure provided in an embodiment of the present application.

[0020] Figure 5A It is a schematic diagram of an integrated inductor flux loop provided in an embodiment of the present application.

[0021] Figure 5B This is another schematic diagram of an integrated inductor flux loop provided in an embodiment of the present application.

[0022] Main component symbols

[0023]

[0024] DETAILED DESCRIPTION

[0025] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In the specification, claims and drawings of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "multiple" in the specification, claims and drawings of the present application refers to two or more than two.

[0026] It is understandable that the connection relationship described in the present application refers to direct or indirect connection. For example, A is connected to B or A is electrically connected to B, which can be either A and B are directly connected or A and B are indirectly connected through one or more other electrical components, for example, A and C are directly connected, and C and B are directly connected, so that A and B are connected through C.

[0027] It should also be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchangeable with each other, and some of the steps can also be deleted.

[0028] Some embodiments will be described below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0029] As mentioned above, there are problems in the multi-phase inverter such as excessive cost, volume and weight of the inductor structure.

[0030] In view of this, an embodiment of the present application provides an integrated inductor, which can reduce the total volume of the inductor, reduce weight, reduce cost, balance the inductance, and reduce core loss.

[0031] The integrated inductor provided in the present application can be applied to a multi-phase circuit, which can be three-phase or more. The multi-phase circuit generally includes multiple AC input terminals, or multiple AC output terminals, or multiple AC input terminals and multiple AC output terminals, to input or output AC power with the same frequency and different phases.

[0032] An electronic device including a multiphase circuit may be, for example, a multiphase power converter. There are generally three basic types of multiphase power converters, namely, a multiphase rectifier, a multiphase inverter, and a multiphase cycloconverter. Among them, a multiphase rectifier is used to convert multiphase alternating current input from multiple AC input terminals into direct current; a multiphase inverter is used to convert direct current into multiphase alternating current, and output it through multiple AC output terminals; a multiphase cycloconverter is used to convert multiphase alternating current of one frequency input from multiple AC input terminals into multiphase alternating current of another frequency (i.e., AC-AC frequency conversion), or to convert multiphase alternating current of a fixed voltage (or power) into multiphase alternating current of another voltage (or power) (i.e., AC voltage regulation and AC power regulation), and output it through multiple AC output terminals.

[0033] The integrated inductor provided in the embodiment of the present application can be applied to electronic devices such as multi-phase rectifiers, multi-phase inverters and multi-phase cycloconverters to achieve functions such as filtering out specific frequency bands in signals to suppress and prevent interference. It can also be used to achieve anti-coupling in circuit topologies that require multi-phase interleaving, and the present application does not make specific limitations on this.

[0034] An integrated inductor is provided in an embodiment of the present application. The integrated inductor includes an upper cover, a lower cover, N middle columns, N+1 side columns, N main windings and auxiliary windings. The upper cover and the lower cover are parallel to each other. One end of each of the N middle columns is in contact with the upper cover, and the other end is in contact with the lower cover. The first part of each of the N+1 side columns is in contact with the upper cover, and the second part is in contact with the lower cover, and the first part is the part of the side column away from the second part. Any two adjacent side columns of the N+1 side columns are separated by one of the N middle columns. The volume of the side column is smaller than the volume of the middle column, and the magnetic permeability of the side column is greater than the magnetic permeability of the middle column. The N main windings are arranged on the N middle columns in a one-to-one correspondence. The auxiliary windings are arranged on the side columns.

[0035] In the embodiment of the present application, N is an integer greater than or equal to 3, and N may be the number of phases of the coupled inductor.

[0036] The following takes N=3 as an example and specifically introduces the integrated inductor provided in the embodiment of the present application in conjunction with the accompanying drawings. In actual use, the number N can be determined according to the circuit or electronic device where the integrated inductor is located. For example, if the electronic device includes a four-phase circuit, then N can be determined to be 4, and the integrated inductor can be manufactured accordingly according to the embodiment of the present application.

[0037] See also Figure 1 and Figure 2 , an integrated inductor 100 provided in an embodiment of the present application is exemplarily introduced. The integrated inductor 100 includes an upper cover 10, a lower cover 20, three middle columns, four side columns, three main windings and auxiliary windings (such as 60a, 60b, 60c, 60d, 60e and 60f). The three middle columns are respectively the first middle column 31a, the second middle column 31b and the third middle column 31c. The four side columns are respectively the first side column 41a, the second side column 41b, the third side column 41c and the fourth side column 41d. The three main windings are respectively the first main winding 51a, the second main winding 51b and the third main winding 51c.

[0038] In the embodiment of the present application, the upper cover 10 may include an upper magnetic yoke, and the upper magnetic yoke may include Figure 1 The first upper magnetic yoke 11a, the second upper magnetic yoke 11b and the third upper magnetic yoke 11c are shown. The lower cover 20 may include a lower magnetic yoke, and the lower magnetic yoke may include Figure 1 The first lower magnetic yoke 21a, the second lower magnetic yoke 21b and the third lower magnetic yoke 21c are shown. The magnetic permeability of the upper magnetic yoke and the lower magnetic yoke is greater than the magnetic permeability of the air. The upper magnetic yoke and the lower magnetic yoke are used to transmit the magnetic flux lines generated by the winding (main winding, auxiliary winding) in the magnetic column (middle column, side column) to the adjacent magnetic column. The magnetic flux lines generated by any winding of the integrated inductor 100 in the corresponding magnetic column are transmitted along the upper magnetic yoke and the lower magnetic yoke in contact with the magnetic column, and more magnetic flux lines enter other magnetic columns adjacent to the magnetic column to form a closed curve.

[0039] The first part of the side column contacts the upper magnetic yoke, and the second part of the side column contacts the lower magnetic yoke. The first part can be understood as the upper part of the side column, and the second part can be understood as the lower part of the side column away from the upper part. Figure 1 As shown, the first portion of the first side post 41a contacts the first upper magnetic yoke 11a, and the second portion of the first side post 41a contacts the first lower magnetic yoke 21a. The first portion of the second side post 41b contacts the first upper magnetic yoke 11a and the second upper magnetic yoke 11b, respectively, and the second portion of the second side post 41b contacts the first lower magnetic yoke 21a and the second lower magnetic yoke 21b, respectively. The first portion of the third side post 41c contacts the second upper magnetic yoke 11b and the third upper magnetic yoke 11c, respectively, and the second portion of the third side post 41c contacts the second lower magnetic yoke 21b and the third lower magnetic yoke 21c, respectively. The first portion of the fourth side post 41d contacts the third upper magnetic yoke 11c, and the second portion of the fourth side post 41d contacts the third lower magnetic yoke 21c.

[0040] The upper cover 10 may include N upper magnetic yokes and the first parts of N+1 side pillars. Figure 3 and Figure 4, the upper cover 10 may include three upper magnetic yokes and the first parts of four side pillars, that is, the upper cover 10 includes the first upper magnetic yoke 11a, the second upper magnetic yoke 11b, the third upper magnetic yoke 11c, and the first parts of the first side pillar 41a, the second side pillar 41b, the third side pillar 41c, and the fourth side pillar 41d. In other words, the first upper magnetic yoke 11a, the second upper magnetic yoke 11b, the third upper magnetic yoke 11c and the first parts of the above four side pillars are spliced ​​into the upper cover 10.

[0041] The lower cover 20 may include N lower magnetic yokes and the second portion of N+1 side pillars. Figure 3 , the lower cover 20 may include three lower yokes and the second parts of four side pillars, that is, the lower cover 20 may include the first lower yoke 21a, the second lower yoke 21b, the third lower yoke 21c and the second parts of the first side pillar 41a, the second side pillar 41b, the third side pillar 41c and the fourth side pillar 41d. In other words, the first lower yoke 21a, the second lower yoke 21b and the third lower yoke 21c and the second parts of the above four side pillars are spliced ​​into the lower cover 20.

[0042] In the embodiment of the present application, the middle column is placed between the upper magnetic yoke and the lower magnetic yoke. Figure 3 As shown, the first center column 31a is arranged between the first upper magnetic yoke 11a and the first lower magnetic yoke 21a, one end of the first center column 31a contacts the first upper magnetic yoke 11a, and the other end contacts the first lower magnetic yoke 21a. The second center column 31b is arranged between the second upper magnetic yoke 11b and the second lower magnetic yoke 21b, one end of the second center column 31b contacts the second upper magnetic yoke 11b, and the other end contacts the second lower magnetic yoke 21b. The third center column 31c is arranged between the third upper magnetic yoke 11c and the third lower magnetic yoke 21c, one end of the third center column 31c contacts the third upper magnetic yoke 11c, and the other end contacts the third lower magnetic yoke 21c.

[0043] In the embodiment of the present application, the volume of the side column is smaller than the volume of the middle column, and the magnetic permeability of the side column is greater than the magnetic permeability of the middle column. The volumes of the first side column 41a, the second side column 41b, the third side column 41c, and the fourth side column 41d are all smaller than the volumes of the first middle column 31a, the second middle column 31b, and the third middle column 31c. The magnetic permeabilities of the first side column 41a, the second side column 41b, the third side column 41c, and the fourth side column 41d are all greater than the magnetic permeabilities of the first middle column 31a, the second middle column 31b, and the third middle column 31c.

[0044] In the embodiment of the present application, the magnetic permeability of the side column and the magnetic permeability of the middle column are of different orders of magnitude.

[0045] In the embodiment of the present application, the magnetic permeability of the side columns is on the order of thousands, and the magnetic permeability of the middle column is on the order of tens.

[0046] In other embodiments, the magnetic permeability of the side column ranges from 500 to 15000. The magnetic permeability of the middle column ranges from 20 to 100.

[0047] It is understood that the magnetic permeability of the side column and the magnetic permeability of the middle column can be set according to actual conditions, and this application does not make specific restrictions on this. For example, to ensure that the difference in magnetic resistance between the side column and the middle column is achieved, the magnetic permeability of the side column and the magnetic permeability of the middle column can be set according to actual conditions.

[0048] The volumes of the first side pillar 41a, the second side pillar 41b, the third side pillar 41c and the fourth side pillar 41d may be the same or different. The volumes of the first middle pillar 31a, the second middle pillar 31b and the third middle pillar 31c may be the same or different.

[0049] In the embodiment of the present application, the material of the yoke (upper yoke, lower yoke) and the magnetic column (middle column, side column) is the magnetic core material, and the magnetic core material may include but is not limited to: ferrite, amorphous, nanocrystalline, magnetic powder core, silicon steel sheet.

[0050] In the embodiment of the present application, the integrated inductor 100 may include N groups of windings, each of which may include a main winding. The N main windings are arranged on the N middle columns in a one-to-one correspondence. Figure 1 As shown, the first main winding 51a is arranged on the first center pole 31a, the second main winding 51b is arranged on the second center pole 31b, and the third main winding 51c is arranged on the third center pole 31c.

[0051] In the embodiment of the present application, N groups of windings may be provided according to N-phase inductances, and the present application does not make any specific limitation to this.

[0052] In the embodiment of the present application, each group of windings may further include an auxiliary winding. The number of the auxiliary windings may be N groups, the N groups of auxiliary windings correspond to the N middle columns one by one, and each group of auxiliary windings is arranged on two side columns adjacent to the middle column. A group of auxiliary windings may include one or more auxiliary windings.

[0053] When a group of auxiliary windings includes more than one auxiliary winding, the more than one auxiliary windings are respectively arranged on two side poles adjacent to the middle pole. When a group of auxiliary windings includes two auxiliary windings, the two auxiliary windings are respectively arranged on two side poles adjacent to the middle pole.

[0054] For example, a group of windings includes a main winding and a group of auxiliary windings, and a group of auxiliary windings includes two windings. Figure 1As shown, the integrated inductor 100 includes three groups of windings, namely the first winding, the second winding and the third winding. The first winding includes an auxiliary winding 60a arranged on the first side column 41a, a first main winding 51a arranged on the first middle column 31a, and an auxiliary winding 60b arranged on the second side column 41b. The second winding includes an auxiliary winding 60c arranged on the second side column 41b, a second main winding 51b arranged on the second middle column 31b, and an auxiliary winding 60d arranged on the third side column 41c. The third winding includes an auxiliary winding 60e arranged on the third side column 41c, a third main winding 51c arranged on the third middle column 31c, and an auxiliary winding 60f arranged on the fourth side column 41d.

[0055] In the embodiment of the present application, the N+1 side columns include two target side columns and N-1 non-target side columns. The target side columns are the side columns on both sides of the N+1 side columns, and the non-target side columns are the side columns that are not target side columns among the N+1 side columns. The first number of turns of the auxiliary winding on the target side column is different from the second number of turns of the auxiliary winding on the non-target side column.

[0056] like Figure 1 The first side column 41a and the fourth side column 41d are shown as the side columns located at the side of the four side columns, that is, the first side column 41a and the fourth side column 41d are the target side columns, and the second side column 41b and the third side column 41c are the non-target side columns. The first number of turns of the auxiliary winding (60a, 60f) on the first side column 41a and the fourth side column 41d is different from the second number of turns of the auxiliary winding (60b, 60c, 60d, 60e) on the second side column 41b and the third side column 41c.

[0057] In the embodiment of the present application, the first number of turns is greater than the second number of turns. For example, the first number of turns of the auxiliary winding 60a is greater than the second number of turns of the auxiliary winding 60b.

[0058] In another embodiment, the total number of turns of the auxiliary windings provided on the target side column is different from the total number of turns of the auxiliary windings provided on the non-target side column. For example, the total number of turns of the auxiliary winding 60a on the first side column 41 is different from the total number of turns of the auxiliary windings 60b and 60c on the second side column 41b.

[0059] In other embodiments, the total number of turns of the auxiliary windings provided on the target side column is greater than the total number of turns of the auxiliary windings provided on the non-target side column. For example, the first total number of turns of the auxiliary winding 60a on the first side column 41 is greater than the second total number of turns of the auxiliary windings 60b and 60c on the second side column 41b, and the second total number of turns is the sum of the numbers of turns of the auxiliary windings 60b and 60c.

[0060] In the embodiment of the present application, when a group of auxiliary windings includes one auxiliary winding, the auxiliary winding can be arranged on any side column adjacent to the middle column according to actual conditions. When a group of auxiliary windings includes one auxiliary winding, when the auxiliary winding is arranged on the side column adjacent to the middle column, the auxiliary winding can be preferentially arranged on the target side column.

[0061] In the embodiment of the present application, the number of auxiliary windings included in the integrated inductor 100 may be two. That is, a group of windings may include a main winding and an auxiliary winding, or may only include a main winding. For example, auxiliary windings may be provided on the first side column 41a and the fourth side column 41d, and no auxiliary windings may be provided on the second side column 41b and the third side column 41c. That is, the first winding includes the auxiliary winding on the first side column 41a and the first main winding 51a on the first middle column 31a, the second winding includes only the second main winding 51b on the second middle column 31b, and the third winding includes the third main winding 51c on the third middle column 31c and the auxiliary winding in the fourth side column.

[0062] In the embodiment of the present application, when the number of auxiliary windings included in the integrated inductor 100 is two, the two auxiliary windings are respectively arranged on two target side poles, and the inductance balance is adjusted by adding air gaps through N phases. For example, an air gap may be arranged on each middle pole. Specifically, an air gap may be arranged between each middle pole and the upper magnetic yoke and the lower magnetic yoke that it contacts.

[0063] In the embodiment of the present application, the winding direction of the auxiliary winding is the same as or different from that of the main winding. The winding direction of the auxiliary winding and the main winding can be set according to actual conditions, and the present application does not make any specific limitation on this.

[0064] In the embodiment of the present application, the winding may include but is not limited to: Litz wire, copper round wire, copper flat wire. The above windings can also be arranged according to actual conditions and the combination of single windings, such as single-strand or multi-strand parallel winding, which is not specifically limited in the present application.

[0065] In the embodiment of the present application, the integrated inductor 100 can reduce the volume of the magnetic core by sharing the side pillars. Figure 5A and Figure 5B The magnetic flux loop of the integrated inductor 100 shown in FIG. Figure 5A and Figure 5B As shown in the figure, the dotted lines with arrows represent the magnetic flux lines in the magnetic core (magnetic column, magnetic yoke). The magnetic flux lines are used to describe the magnetic field generated by the winding, and the magnetic flux lines are closed curves. There will be a side column between two adjacent middle columns, which is equivalent to the common magnetic path of the magnetic flux of the two adjacent middle columns. In this way, the magnetic flux in the side column between the two adjacent middle columns can offset each other, thereby reducing the core loss. In addition, the volume of the magnetic core is reduced by sharing the side column, thereby greatly reducing the product volume and cost.

[0066] In the embodiment of the present application, the integrated inductor 100 realizes the difference in magnetic resistance of different magnetic circuits by splicing magnetic core materials with different magnetic permeabilities, thereby controlling the magnetic flux loop of each phase, so that each winding is weakly coupled only through the auxiliary winding of the shared side column, thereby achieving the effect of adjusting the equivalent magnetic permeability of the magnetic flux loop.

[0067] When implementing the embodiments of the present application, the inventors found that the existing integrated inductors have an unbalanced problem in which the inductance of the middle column winding is greater than that of the side column winding. In view of this, the integrated inductor 100 of the embodiment of the present application is provided with auxiliary windings on the side columns, which can more flexibly adjust the inductance of each phase according to the actual situation, and use the auxiliary windings to perform weak coupling design on the multi-phase inductors, solve the problem of multi-phase unevenness caused by design and process, and achieve multi-phase balance between inductors. Figure 1 As shown, the number of turns of the auxiliary windings on the first side column 41a and the fourth side column 41d is different from the number of turns of the auxiliary windings on the second side column 41b and the third side column 41c, so that the actual inductance of each main winding can be adjusted, thereby solving the imbalance problem in the prior art that the inductance of the middle column winding of the integrated inductor is greater than that of the side column winding.

[0068] In the embodiment of the present application, the coupling relationship between the N-phase inductors can be determined by the winding direction of the auxiliary winding and the main winding: positive coupling or negative coupling, so as to adapt to the actual circuit working condition requirements. Figure 5A and Figure 5B As shown, by controlling the winding directions of the auxiliary windings of the first winding and the second winding on the second side column 41b and the third side column 41c, the anti-coupled inductor design in the circuit topology requiring multi-phase interleaving can be achieved.

[0069] It is understandable that the above Figures 1 to 4 An exemplary formation method of the upper cover 10 and the lower cover 20 is shown. In other embodiments, the upper cover 10 may include M upper magnetic yokes and the first ends of K side pillars. The lower cover 20 may include M lower magnetic yokes and the second ends of K side pillars. M is less than N and greater than or equal to 1, K is less than 4 and greater than or equal to 1, and M and K can be set according to actual conditions.

[0070] In other embodiments, the upper cover 10 may include only an upper magnetic yoke, and the lower cover 20 may include only a lower magnetic yoke. For example, the upper cover 10 may be composed of more than or equal to one upper magnetic yoke, and the lower cover 20 may be composed of more than or equal to one lower magnetic yoke.

[0071] The integrated inductor 100 provided in the embodiment of the present application includes but is not limited to the following technical effects:

[0072] The multi-phase inductance of the magnetic integrated inductor 100 reduces the volume of the magnetic core by sharing the side columns, the upper cover 10 and the lower cover 20, and by splicing the side columns with high magnetic permeability, a higher inductance can be achieved in a smaller side column volume, so as to achieve the circuit inductance requirements in a smaller volume. In addition, the magnetic flux loop of each main winding can be constrained by the side columns, so that the main windings are uncoupled or weakly coupled. The auxiliary windings are arranged on the side columns, so that the inductance of each phase can be adjusted more flexibly, and the multi-phase inductance can be balanced through the weak coupling relationship between the auxiliary windings and the main windings. In this way, the total volume of the inductor can be reduced, the weight can be reduced, the cost can be reduced, and the core loss can be reduced, the power density of the whole machine can be improved, and the volume of the aluminum shell of the inductor can be reduced, and finally the volume, weight and cost of the whole machine and the difficulty of installation can be reduced.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. In the actual application process, the entire content of the technical solutions described in any embodiment of the present application can be implemented, or some content can be added, or some content can be deleted, or some content can be changed / replaced. Although the present application is described in detail with reference to the preferred embodiments, it should be understood by those of ordinary skill in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An integrated inductor, characterized in that: include: An upper cover and a lower cover parallel to each other; N middle pillars, one end of each of the middle pillars is in contact with the upper cover, and the other end is in contact with the lower cover; N+1 side pillars, a first portion of each of the side pillars contacts the upper cover, a second portion contacts the lower cover, and the first portion is away from the second portion; any two adjacent side pillars among the N+1 side pillars are separated by one of the N middle pillars; N main windings, the N main windings are arranged on the N middle columns in a one-to-one correspondence, and N is an integer greater than or equal to 3; Auxiliary winding, the auxiliary winding is arranged on the side column; The volume of the side column is smaller than the volume of the middle column, and the magnetic permeability of the side column is greater than the magnetic permeability of the middle column.

2. The integrated inductor according to claim 1, characterized in that: The magnetic permeability of the side columns is of a different order of magnitude from the magnetic permeability of the middle column.

3. The integrated inductor according to claim 1, characterized in that: The magnetic permeability of the side columns is on the order of thousands, and the magnetic permeability of the middle column is on the order of tens.

4. The integrated inductor according to any one of claims 1 to 3, characterized in that: The number of the auxiliary windings is N groups, and the N groups of auxiliary windings correspond one-to-one to the N middle columns. Each group of auxiliary windings is arranged on two side columns adjacent to the middle column.

5. The integrated inductor according to claim 4, characterized in that: A set of auxiliary windings includes two auxiliary windings, and the two auxiliary windings are respectively arranged on two side poles adjacent to the middle pole.

6. The integrated inductor according to any one of claims 1 to 3, characterized in that: The N+1 side columns include two target side columns and N-1 non-target side columns, the target side columns are the side columns on both sides of the N+1 side columns, the non-target side columns are the side columns among the N+1 side columns that are not the target side columns, and the first number of turns of the auxiliary winding on the target side columns is different from the second number of turns of the auxiliary winding on the non-target side columns.

7. The integrated inductor according to claim 6, characterized in that: The first number of turns is greater than the second number of turns.

8. The integrated inductor according to any one of claims 1 to 3, characterized in that: The number of the auxiliary windings is two, and the two auxiliary windings are respectively arranged on the side columns at both sides of the N+1 side columns.

9. The integrated inductor according to claim 8, characterized in that: Each of the center columns is provided with an air gap.

10. The integrated inductor according to claim 1, characterized in that: The winding direction of the auxiliary winding is opposite to that of the main winding.

Images