Integrated inductor and multi-channel parallel converter

Abstract

The present invention discloses an integrated inductor and multi-channel parallel converter, comprising an upper cover plate, a lower cover plate, and 3N side columns arranged vertically between the upper cover plate and the lower cover plate, wherein N is the number of parallel paths; the cross-sectional areas of the 3N side columns are the same; the shape formed by the centers of the 3N side columns connected is an equilateral shape; windings are wound on the 3N side columns, and any two windings are reversely coupled; the angle formed by the centers of two adjacent same-phase side columns and the center of the equilateral shape is 360 / N degrees; the same-phase side column is a side column corresponding to the N-channel inductance of the same phase; the input end of any of the windings is connected to a one-phase power supply, and the output end is electrically connected to the bridge arm circuit of the multi-channel parallel converter. The present invention can reduce the board area occupied by the inductor part and improve the power density of the converter.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to an integrated inductor and a multi-path parallel converter. Background Art

[0002] Multi-channel parallel connection is an effective way to increase the capacity of a three-phase converter. However, the number of three-phase filter inductors required for each additional parallel connection also increases accordingly, which greatly reduces the power density of the multi-channel parallel system. Magnetic integration technology is an effective way to reduce the volume of magnetic components and increase power density, but the existing three-phase inductor magnetic integration technology is mostly for single-channel three-phase converters. At present, most of the integration methods in the existing solutions have the problem of asymmetric three-phase magnetic circuits, which leads to differences in inductance values ​​between phases and puts higher requirements on the control of the converter. And when multiple channels are connected in parallel, if the existing three-phase inductor magnetic integration technology is used, the number of magnetic cores will still increase with the increase in the number of parallel channels. Therefore, the existing technology cannot meet the high power density requirements of multi-channel parallel three-phase converters. Summary of the invention

[0003] The present invention provides an integrated inductor and a multi-channel parallel converter, which are used to solve the problem of low power density of the multi-channel parallel three-phase converter.

[0004] According to a first aspect of the present invention, there is provided an integrated inductor, comprising:

[0005] An upper cover plate, a lower cover plate, and 3N side columns disposed perpendicularly thereto, wherein N is the number of parallel connections;

[0006] The cross-sectional areas of the 3N side pillars are the same;

[0007] The shape formed by connecting the centers of 3N side pillars is an equilateral shape;

[0008] 3N side columns are all wound with windings, and any two windings are reversely coupled; and the inductance value corresponding to each winding is the same;

[0009] The angle formed by the centers of two adjacent in-phase side columns and the center of the equilateral shape is 360 / N degrees; the in-phase side columns are side columns corresponding to N inductors of the same phase;

[0010] The input end of any of the windings is connected to a single-phase power supply, and the output end is electrically connected to a bridge arm circuit of a multi-channel parallel converter.

[0011] Optionally, a middle column respectively connecting the upper cover plate and the lower cover plate is provided at the midpoint of the equilateral shape, and the distance from each of the side columns to the middle column is equal, and in this case there are 3N+1 columns in total.

[0012] Optionally, air gaps of equal length are arranged at the same position of the 3N side columns.

[0013] Optionally, the air gaps are all located at the upper ends of the side columns;

[0014] Alternatively, the air gaps are all located in the middle of the side columns;

[0015] Alternatively, the air gaps are all located at the lower ends of the side columns.

[0016] Optionally, the air gap is filled with non-magnetic material.

[0017] Optionally, the side columns are all made of the same magnetic material;

[0018] Optionally, the middle column is made of a magnetic material different from that of the side columns;

[0019] The material and number of turns of the winding on each of the side poles are the same.

[0020] Optionally, the winding forms on each of the side columns include: flat copper wire winding, Litz wire winding, PCB winding, and enameled wire winding.

[0021] Optionally, the upper cover plate and the lower cover plate have the same shape, and are both one of a cylinder and a regular 3N prism.

[0022] Optionally, the cross-sections of the side columns are the same and are all one of circular, elliptical, triangular, square, rectangular, rounded rectangular and rounded triangle.

[0023] According to another aspect of the present invention, there is provided a multi-channel parallel converter, comprising the integrated inductor; and also comprising a power grid power supply side and a 3N bridge arm circuit;

[0024] The input end of the integrated inductor is connected to the power supply side of the grid;

[0025] The 3N output ends of the integrated inductor are electrically connected to the 3N bridge arm circuits respectively.

[0026] The technical solution of the embodiment of the present invention ensures that the cross-sectional areas of 3N side columns are the same; the shape formed by the centers of the side columns are connected to form an equilateral shape, the number of turns of the windings wound on the 3N side columns are the same, and any two windings are reversely coupled, so that on any winding, the sum of the mutual inductances generated by other windings is the same, that is, the effective inductance values ​​corresponding to each winding are the same, thereby ensuring the symmetry of the three-phase circuit. By making any two windings reversely coupled, the present invention can reduce the number of turns of the winding compared to a single-channel three-phase inductor, thereby reducing the heating loss of the coil. By making the angle formed by the center of two adjacent in-phase side columns and the center of the equilateral shape 360 / N degrees, the inductance values ​​of the three-phase inductors of the three-phase system are equal. By integrating multiple three-phase inductors on one magnetic core, the number of magnetic cores is reduced, thereby reducing the board area occupied by the inductor part and improving the power density.

[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 invention, nor are they intended to limit the scope of the present invention. Other features of the present invention 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 following briefly introduces the drawings required for use in the description of the embodiments. 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 A schematic diagram of the structure of an integrated inductor provided by the present invention;

[0030] Figure 2 A schematic diagram of the structure of a seven-pillar magnetic integrated inductor provided by the present invention;

[0031] Figure 3 A schematic diagram of the structure of an integrated inductor provided by the present invention from a top view;

[0032] Figure 4 A circuit diagram of a multi-path staggered parallel converter including a seven-pillar magnetic integrated inductor provided by the present invention;

[0033] Figure 5 A schematic diagram of magnetic flux density distribution of a seven-pillar magnetic integrated inductor provided by the present invention;

[0034] Figure 6 A schematic diagram of the structure of a ten-pillar magnetic integrated inductor provided by the present invention from a top view. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Figure 1 The present invention provides a structural schematic diagram of an integrated inductor, which is Embodiment 1 and is described by applying it to a two-path staggered parallel three-phase Vienna rectifier.

[0038] like Figure 1 As shown, the integrated inductor includes:

[0039] An upper cover plate, a lower cover plate, and six side columns between the upper cover plate and the lower cover plate and arranged perpendicularly to the upper cover plate and the lower cover plate, wherein N=2 in this embodiment;

[0040] The cross-sectional areas of the six side pillars are the same;

[0041] The shape formed by connecting the centers of the six side columns is an equilateral shape;

[0042] Windings are wound on the six side columns, and any two windings are reversely coupled; and the effective inductance corresponding to each winding is the same; the input end of any winding is connected to a one-phase power supply, and the output end is connected to a Vienna circuit.

[0043] The angle formed by the centers of two adjacent in-phase side columns and the center of the equilateral shape is 180 degrees; the in-phase side columns are side columns corresponding to two inductors of the same phase;

[0044] The number of side poles is six, and the input ends of the windings arranged on the six side poles correspond to the three-phase power supply respectively, and the output end of the winding on each phase corresponds to two parallel three-phase AC-DC or DC-AC converters. For example, for a two-way parallel three-phase AC-DC or DC-AC converter including six side poles, two in-phase inductors are connected to each phase power supply respectively, and the outputs of the two in-phase inductors are connected to Vienna circuits respectively.

[0045] The upper cover plate and the lower cover plate can be made of the same magnetic material, and their shapes can be set arbitrarily. For example, the cross-sectional area of ​​the upper cover plate can be larger than that of the lower cover plate, or the cross-sectional area of ​​the lower cover plate can be larger than that of the upper cover plate. The upper cover plate and the lower cover plate are used to fix the six side columns vertically arranged between the upper cover plate and the lower cover plate, and are also used to form a closed-loop magnetic circuit between the side columns, the upper cover plate and the lower cover plate; when an intermediate column is vertically arranged between the upper cover plate and the lower cover plate, a closed-loop magnetic circuit can be formed between the side columns, the upper cover plate, the intermediate column and the lower cover plate.

[0046] In actual integrated inductor design, the upper cover and the lower cover can be designed to be the same shape, and the area of ​​the upper cover and the lower cover can be designed to be as small as possible while satisfying the area required by the six side columns. For example, when six side columns are provided between the upper cover and the lower cover, the upper cover and the lower cover can be designed to be regular hexagonal prisms, and the six side columns can be provided at the six corners of the regular hexagonal prisms of the upper cover and the lower cover, respectively. Figure 3 The schematic diagram of the integrated inductor including 6 side pillars from the top view is shown. Figure 3 It can be seen that the cross section of each side column is closely attached to the two sides of an angle of the regular hexagon, that is, each side column is arranged on a corner of the lower part of the upper cover plate and the upper part of the lower cover plate.

[0047] The technical solution of this embodiment ensures that the cross-sectional areas of the 3N side columns are the same; the shape formed by connecting the centers of the side columns is an equilateral shape, the number of turns of the windings wound on the 3N side columns is the same, and any two windings are reversely coupled, so that the sum of the mutual inductances generated by the other windings on any winding is the same, that is, the effective inductance values ​​corresponding to each winding are the same. By making the angle formed by the center of two adjacent same-phase side columns and the center of the equilateral shape 360 / N degrees, the inductance values ​​of the three-phase inductance of the three-phase system are equal. By integrating multiple three-phase inductances on one magnetic core, the number of magnetic cores is reduced, thereby reducing the board area occupied by the inductance part and improving the power density.

[0048] Specifically, the relative position relationship between the six sets of windings is described as follows. Two parallel three-phase AC-DC or DC-AC converters require two three-phase inductors, which are respectively recorded as LA1, LB1, LC1, LA2, LB2, and LC2. For the convenience of description, any side column is selected as side column No. 1, and the remaining side columns are recorded as side column No. 2, side column No. 3, side column No. 4, side column No. 5, and side column No. 6 in clockwise order. The relative position relationship between the six sets of windings is not unique, but should meet the following principles: the two side columns symmetrical about the middle column are the winding columns of the two inductors of the same phase to ensure the symmetry of the three-phase inductance. For example, the inductance formed by the windings wound around the No. 1 side column can be assumed to be LA1, then a relative position relationship between the six sets of windings and is that the inductance formed by the windings wound around the No. 2 side column is LC2, the inductance formed by the windings wound around the No. 3 side column is LB1, the inductance formed by the windings wound around the No. 4 side column is LA2, the inductance formed by the windings wound around the No. 5 side column is LC1, and the inductance formed by the windings wound around the No. 6 side column is LB2, as shown in FIG. Figure 3 shown.

[0049] Figure 4 An integrated converter circuit diagram is provided in which each phase grid power supply is connected to the input ends of two inductors respectively, and the output ends of the two inductors on the same phase are connected to the midpoint of the Vienna circuit bridge arm respectively.

[0050] The integrated inductor includes 3N side columns, N can be 1, and the present application is mainly used in multi-channel parallel converters, so N is set to be greater than or equal to 2. For example, it can be an integrated inductor including 6 side columns, or it can be an integrated inductor including 9 side columns. Figure 3 A schematic diagram of a structure of a magnetic integrated inductor including six side columns from a top view is shown, and Figure 6 The schematic diagram of the structure of the magnetic integrated inductor with 9 side columns from a top view is shown in FIG. It can be seen that the output of the magnetic integrated inductor with 6 side columns corresponds to two parallel three-phase AC-DC or DC-AC converters, that is, each phase corresponds to two inductors with the same phase, and the outputs of the two inductors with the same phase are connected to the Vienna circuit respectively, that is, Figure 4 As shown; the output of the magnetic integrated inductor comprising 9 side columns corresponds to three parallel three-phase AC-DC or DC-AC converters, that is, each phase corresponds to 3 inductors with the same phase, and the outputs of the 3 inductors with the same phase are respectively connected to the Vienna circuit. Therefore, the main difference between the magnetic integrated inductor comprising 9 side columns and the magnetic integrated inductor comprising 6 side columns is that the number of corresponding three-phase AC-DC or DC-AC converters is different, that is, one is a 2-way parallel three-phase AC-DC or DC-AC converter, and the other is a 3-way parallel three-phase AC-DC or DC-AC converter. For the convenience of description, this embodiment will only describe in detail the magnetic integrated inductor comprising 6 side columns later.

[0051] The circuit diagram of the two-way parallel converter with integrated inductor is as follows Figure 4 As shown: each phase of the three-phase power supply is connected to an integrated inductor, and the output end of each integrated inductor is electrically connected to the Vienna rectifier.

[0052] For the convenience of description, only phase A is described. The corresponding inductance value of phase A of the power grid is L A1 and L A2 The grid A phase is electrically connected to the input end of the A1 winding and the input end of the A2 winding. The output end of the A1 winding is electrically connected to the midpoint of the first bridge arm circuit of the Vienna rectifier and the first end of the switch device Sa1 respectively; the output end of the A2 winding is electrically connected to the midpoint of the second bridge arm circuit of the Vienna rectifier and the first end of the switch device Sa2 respectively; the second end of the switch device Sa1 and the second end of the switch device Sa2 are both connected to the midpoint of the capacitor. Among them, diodes D1, D2 and switch device Sa1 form the first bridge arm circuit of phase A; the anode of diode D1 is connected to the cathode of diode D2, and the connection point is called the midpoint of the first bridge arm circuit; diodes D3, D4 and switch device Sa2 form the second bridge arm circuit of this phase; the anode of diode D3 is connected to the cathode of diode D4, and the connection point is called the midpoint of the second bridge arm circuit; the cathode of diode D1 and the cathode of diode D3 are electrically connected to the positive DC bus, and the anode of diode D2 and the anode of diode D4 are electrically connected to the negative DC bus; two capacitors C1 and C2 are connected in series between the positive DC bus and the negative DC bus, and the two capacitors C1 and C2 are connected, and the connection point is called the capacitor midpoint. Switches S1 and S2 are both series-connected two fully-controlled devices, the two fully-controlled devices that constitute S1 share a driving signal for driving, and the two fully-controlled devices that constitute S2 share another driving signal for driving, and there is a 180° phase difference between the driving signals of S1 and S2. Phase B corresponds to L B1 and L B2 The two windings, B1 winding and B2 winding; C phase corresponds to L C1 and L C2 The two windings, C1 winding and C2 winding, are connected in the same way as the connection between phase A and the integrated inductor and the Vienna circuit.

[0053] In one embodiment, the side columns are all made of the same magnetic material, for example, a combination of one or more of ferrite, amorphous and nanocrystalline.

[0054] In a certain embodiment, the winding forms on each side column include: flat copper wire winding, Litz wire winding, PCB winding, enameled wire winding.

[0055] In one embodiment, the cross-sections of the side columns are the same and are all one of a circle, an ellipse, a triangle, a square, a rectangle, a rounded rectangle and a rounded triangle.

[0056] In one embodiment, the upper cover plate and the lower cover plate have the same shape, and are both one of a cylinder and a regular 3N prism.

[0057] In another embodiment, a middle column respectively connecting the upper cover plate and the lower cover plate is provided at the midpoint of the equilateral shape, and the distance from each side column to the middle column is equal, which is the second embodiment.

[0058] The shape of the middle column can be set arbitrarily, and its cross section can be one of a circle, an ellipse, a triangle, a square, a rectangle, a rounded rectangle and a rounded triangle, and can be specifically set to a circle. The middle column can be vertically arranged between the upper cover plate and the lower cover plate. Specifically, it can be arranged at the midpoint of the equilateral shape formed by the side columns. For example, when the upper cover plate and the lower cover plate are both regular hexagonal prisms, the upper cover plate and the lower cover plate are symmetrically arranged, and the six side columns are respectively arranged at the corresponding corners of the lower part of the upper cover plate and the upper part of the lower cover plate, the two ends of the middle column can be respectively connected to the center of the lower part of the upper cover plate and the center of the upper part of the lower cover plate, so that the distance from the middle column to each side column is equal.

[0059] like Figure 2 The structural diagram of a seven-pillar magnetic integrated inductor is shown, wherein a middle pillar connected to the upper cover plate and the lower cover plate is provided at the midpoint of the equilateral shape formed by the side pillars, and the distance from each side pillar to the middle pillar is equal. Each side pillar has the same shape and material; the material and number of turns of its winding are also the same; and the two windings of the same phase are symmetrically arranged about the middle pillar.

[0060] When an air gap is set on the side column, the middle column without an air gap can be used to adjust the degree of coupling between the windings. In this embodiment, there are multiple ways to set the air gap: one embodiment is to place the air gap at the upper end of the side column, for example, the air gap can be set at the connection between the side column and the upper cover plate, or at the same height of the upper half of the side column; another embodiment is to place the air gap in the middle of the side column; another embodiment is to place the air gap at the lower end of the side column, for example, the air gap can be set at the connection between the side column and the lower cover plate, or at the same height of the lower half of the side column. It should be noted that the length of the air gap on each side column is the same, and its shape should also be the same to ensure the same degree of coupling between the windings.

[0061] In one embodiment, the air gap may be filled with non-magnetic material.

[0062] When no air gap is provided on the side poles, the coupling degree between the windings can be adjusted by making the middle pole with a magnetic material having a higher magnetic permeability than the side poles.

[0063] It should be noted that whether to add an air gap in a specific implementation can be selected according to needs. In the second embodiment, no air gap is provided, and the middle column uses a magnetic material with a higher magnetic permeability than the side columns.

[0064] The magnetic fluxes generated by the windings on the six side columns on the middle column are Φ A1 , Φ B1 , Φ C1 , Φ A2 , Φ B2 , Φ C2 , where Φ A1 and Φ A2 are the magnetic fluxes generated by the two windings on phase A on the middle column; where Φ B1 and Φ B2 are the magnetic fluxes generated by the two windings on phase B on the middle column; C1 and Φ C2 They are the magnetic fluxes generated by the two windings on phase C on the middle column. Therefore, the magnetic flux Φ on the middle column is:

[0065] Φ =(Φ A1 + Φ A2 + Φ B1 + Φ B2 + Φ C1 + Φ C2 ) = 0

[0066] Since the sum of the three-phase currents in a three-phase three-wire system is 0, and the same-phase windings are in reverse coupling, the above equation is 0. The detailed analysis is as follows:

[0067] The inductance A1, inductance B1, and inductance C1 are reversely coupled in pairs. If the circulating current in the parallel system is ignored, since the sum of the three-phase currents in the three-phase three-wire system is 0, theoretically the sum of the magnetic fluxes generated by these three inductors on the middle core column is 0; the inductance A2, inductance B2, and inductance C2 are also reversely coupled in pairs. Similarly, theoretically the sum of the magnetic fluxes generated by these three inductors on the middle core column is also 0; the inductance A1 and inductance A2 are also reversely coupled. According to the above coupling relationship, it can be inferred that the inductance B1 and inductance B2 are reversely coupled and the inductance C1 and inductance C2 are reversely coupled. When the two converters are modulated by interleaved carriers, there will be circulating currents between the two inductors of the same phase. At this time, the circulating currents cannot be ignored. Since the two inductors of the same phase are reversely coupled, the sum of the magnetic fluxes generated by the circulating currents on the middle column is also 0. Therefore, regardless of whether the two bridge arms of the same phase are interleaved with carriers, the magnetic flux of the middle column is theoretically always 0. Since there is no change in magnetic flux in the middle column, there is no core loss.

[0068] In practical applications, the coupling coefficient between windings can be adjusted by selectively adding an intermediate column. Since the magnetic flux on the intermediate column is 0, the addition of the intermediate column will not increase the loss of the magnetic core.

[0069] Since each side column and the windings on the side columns are the same, and since the shape formed by the centers inside the side columns is an equilateral shape, the angle formed by the centers of the two side columns with the same phase and the center of the equilateral shape is 180 degrees; therefore, the effective inductance of the windings on each side column is the same or the same within the allowable error range.

[0070] The magnetic field finite element simulation is performed on the seven-pillar magnetic integrated inductor provided in this embodiment, and its magnetic density distribution is as follows: Figure 5 As shown, the magnetic flux density of the middle column is basically 0, so the middle column has basically no core loss. And the main function of the middle column is to provide a low magnetic resistance magnetic circuit to reduce the coupling degree between the windings. When tight coupling between the windings is required, the middle column can also be removed.

[0071] The invention provides a multi-path staggered parallel converter circuit diagram as shown in Figure 4 As shown, Figure 4 The integrated inductor is included; the power grid power supply side and the 3N bridge arm circuit are also included;

[0072] The input end of the integrated inductor is connected to the power supply side of the grid;

[0073] The 3N output ends of the integrated inductor are electrically connected to the 3N bridge arm circuits respectively.

[0074] For example, Figure 4 LA1, LB1, LC1, LA2, LB2, and LC2 represent the inductances corresponding to the windings on each side column of the seven-column magnetic integrated inductor; the A-phase power supply of the power grid is respectively connected to the input ends of the two A-phase inductors LA1 and LA2 on the integrated inductor, and the output ends of LA1 and LA2 are respectively connected to the midpoint of the bridge arm circuit; similarly, the B-phase power supply of the power grid is respectively connected to the input ends of the two B-phase inductors LB1 and LB2 on the integrated inductor, and the output ends of LB1 and LB2 are respectively connected to the midpoint of the bridge arm circuit; the C-phase power supply of the power grid is respectively connected to the input ends of the two C-phase inductors LC1 and LC2 on the integrated inductor, and the output ends of LC1 and LC2 are respectively connected to the midpoint of the bridge arm circuit.

[0075] The above specific implementations do not constitute a limitation on the protection scope of the present invention. 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 invention should be included in the protection scope of the present invention.

Claims

1. An integrated inductor, characterized in that: include: An upper cover plate, a lower cover plate, and 3N side columns disposed perpendicularly thereto, wherein N is the number of parallel connections; The cross-sectional areas of the 3N side pillars are the same; The shape formed by connecting the centers of 3N side pillars is an equilateral shape; 3N side columns are all wound with windings, and any two windings are reversely coupled; and the inductance value corresponding to each winding is the same; The angle formed by the centers of two adjacent in-phase side columns and the center of the equilateral shape is 360 / N degrees; the in-phase side columns are side columns corresponding to N inductors of the same phase; The input end of any of the windings is connected to a single-phase power supply, and the output end is electrically connected to a bridge arm circuit of a multi-channel parallel converter.

2. The integrated inductor according to claim 1, characterized in that: An intermediate column connecting the upper cover plate and the lower cover plate respectively may be provided at the midpoint of the equilateral shape, and the distance from each of the side columns to the intermediate column is equal, and in this case there are 3N+1 columns in total; Alternatively, no intermediate column is provided at the midpoint of the equilateral shape.

3. The integrated inductor according to claim 1, characterized in that: An air gap of equal length is arranged at the same position of the 3N side pillars.

4. The integrated inductor according to claim 3, characterized in that: The air gaps are all located at the upper ends of the side columns; Alternatively, the air gaps are all located in the middle of the side columns; Alternatively, the air gaps are all located at the lower ends of the side columns.

5. The integrated inductor according to claim 3, characterized in that: The air gap is filled with non-magnetic material.

6. The integrated inductor according to claim 1, characterized in that: The side columns are all made of the same magnetic material; The material and number of turns of the winding on each of the side poles are the same.

7. The integrated inductor according to claim 6, characterized in that: The winding forms on each of the side columns include: flat copper wire winding, Litz wire winding, PCB winding, and enameled wire winding.

8. The integrated inductor according to claim 1, characterized in that: The upper cover plate and the lower cover plate have the same shape, and are both one of a cylinder and a regular 3N prism.

9. The integrated inductor according to claim 1, characterized in that: The cross sections of the side columns are the same and are all one of circular, elliptical, triangular, square, rectangular, rounded rectangular and rounded triangle.

10. A multi-channel parallel converter, characterized in that: The integrated inductor comprises the integrated inductor according to any one of claims 1 to 9; and further comprises a power grid power supply side and a 3N bridge arm circuit; The input end of the integrated inductor is connected to the power supply side of the grid; The 3N output ends of the integrated inductor are electrically connected to the 3N bridge arm circuits respectively.

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