Three-phase-difference common-mode inductor

Abstract

The utility model discloses a three-phase-difference common-mode inductor. The three-phase-difference common-mode inductor comprises three magnetic core middle columns, three inductance coils, a first iron yoke, a second iron yoke and a side yoke. A first yoke; the three magnetic core middle columns are located on the surface of the first iron yoke. The three inductance coils surround the side faces of the three magnetic core middle columns in a one-to-one correspondence mode. The second iron yoke is positioned on the surfaces, far away from the first iron yoke, of the three magnetic core middle columns; the side yoke is located on one side of the three magnetic core middle columns, one end of the side yoke is connected with the first iron yoke, and the other end of the side yoke is connected with the second iron yoke; the magnetic conductivity of the magnetic core middle column is smaller than that of the first iron yoke, the magnetic conductivity of the magnetic core middle column is smaller than that of the second iron yoke, and the magnetic conductivity of the magnetic core middle column is smaller than that of the edge yoke. According to the utility model, the size and the manufacturing cost of the three-phase-difference common-mode inductor are reduced, and the design of the controller is miniaturized.

Description

Technical Field

[0001] The utility model relates to the technical field of differential mode and common mode inductors, in particular to a three-phase differential common mode inductor. Background Art

[0002] Hydrogen fuel cell electric vehicles use silicon carbide as a power switching device due to the high integration of the controller. The rapid opening and closing of silicon carbide will generate large du / dt and di / dt. Due to the presence of parasitic capacitance and parasitic inductance in the line, it will cause very serious electromagnetic interference, which will cause the conducted emission and radiated emission of the vehicle to exceed the standard when it is running.

[0003] The solution in the prior art is to add differential mode inductors and common mode inductors on the output side of the controller to improve the electromagnetic compatibility problem, but adding differential mode inductors and common mode inductors at the same time will make the volume of the controller larger. Utility Model Content

[0004] The utility model provides a three-phase difference common mode inductor, which reduces the volume and manufacturing cost of the three-phase difference common mode inductor and makes the design of the controller miniaturized.

[0005] According to one aspect of the utility model, a three-phase differential common mode inductor is provided, and the three-phase differential common mode inductor comprises:

[0006] Three core columns, three inductance coils, a first iron yoke, a second iron yoke and a side yoke;

[0007] First Iron Yoke;

[0008] The three magnetic core center columns are located on the surface of the first iron yoke;

[0009] The three inductance coils are respectively wrapped around the sides of the three magnetic core middle columns;

[0010] A second iron yoke, the second iron yoke is located on the surface of the three magnetic core middle columns away from the first iron yoke;

[0011] The side yoke is located on one side of the central column of the three magnetic cores, one end of the side yoke is connected to the first iron yoke, and the other end of the side yoke is connected to the second iron yoke;

[0012] The magnetic permeability of the core center column is less than the magnetic permeability of the first iron yoke, the magnetic permeability of the core center column is less than the magnetic permeability of the second iron yoke, and the magnetic permeability of the core center column is less than the magnetic permeability of the side yoke.

[0013] Furthermore, the size of the orthographic projection of the second yoke on the first yoke in the first direction is smaller than the size of the orthographic projection of the inductor on the first yoke in the first direction, and the first direction is perpendicular to the direction from the first yoke to the second yoke.

[0014] Furthermore, the surface of the side yoke away from the first iron yoke is flush with the surface of the second iron yoke away from the first iron yoke; the surface of the side yoke away from the second iron yoke is flush with the surface of the first iron yoke away from the second iron yoke.

[0015] Furthermore, the size of the orthographic projection of the side yoke on the first iron yoke in the first direction is equal to the size of the orthographic projection of the second iron yoke on the first iron yoke in the first direction.

[0016] Furthermore, three core center columns are arranged at equal intervals and in parallel on the surface of the first iron yoke.

[0017] Furthermore, the center line of the side yoke along the second direction and the center line of each magnetic core center column along the second direction are on the same plane; wherein the second direction is the direction from the first iron yoke to the second iron yoke.

[0018] Furthermore, the size of the orthographic projection of the core column on the first iron yoke in the first direction is smaller than the size of the first iron yoke in the first direction; the size of the orthographic projection of the core column on the second iron yoke in the first direction is smaller than the size of the second iron yoke in the first direction.

[0019] Furthermore, the magnetic core center column is a magnetic powder core center column.

[0020] Furthermore, the iron yoke is a nanocrystalline iron yoke;

[0021] The side yoke is a nanocrystalline side yoke.

[0022] Furthermore, the inductor coil is a hollow inductor coil made of flat copper wire.

[0023] Compared with the prior art in which the common mode inductor and the differential mode inductor are independently set, the three-phase differential common mode inductor set in the embodiment of the utility model integrates the three separate differential mode inductors, thereby reducing the volume and manufacturing cost of the three-phase differential common mode inductor. One end of the side yoke is connected to the first iron yoke, and the other end of the side yoke is connected to the second iron yoke, so that the magnetic flux generated by the common mode current in the three inductor coils is circulated at the iron yoke, and then flows back to the core column through the side yoke, effectively filtering out the common mode noise generated in the three-phase electricity, having the use effect of the common mode inductor, which is equivalent to integrating the common mode inductor and the differential mode inductor, further reducing the volume and manufacturing cost of the three-phase differential common mode inductor, and miniaturizing the design of the controller. At the same time, the number of turns of the output line of the common mode inductor in the prior art is usually one, and the embodiment of the utility model reuses the coil of the three-phase differential mode inductor on the common mode inductor, increasing the number of turns of the coil of the common mode inductor and improving the inductance of the common mode inductor.

[0024] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a partial structural schematic diagram of a three-phase differential common mode inductor provided according to an embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of a three-phase differential common mode inductor provided according to an embodiment of the utility model;

[0028] Figure 3 It is a schematic top view of a three-phase differential common-mode inductor provided according to an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The embodiment of the utility model provides a three-phase difference common mode inductor, Figure 1 is a partial structural diagram of a three-phase differential common mode inductor provided according to an embodiment of the utility model, Figure 2 is a schematic diagram of the structure of a three-phase differential common mode inductor provided according to an embodiment of the utility model, Figure 3 is a top view schematic diagram of a three-phase differential common mode inductor provided according to an embodiment of the utility model, with reference to Figure 1-Figure 3 , the three-phase differential common mode inductors include:

[0032] Three magnetic core middle columns 1, three inductor coils 2, a first iron yoke 3, a second iron yoke 4 and a side yoke 5;

[0033] First iron yoke 3;

[0034] The three magnetic core middle columns 1 are located on the surface of the first iron yoke 3;

[0035] The three inductor coils 2 are respectively wrapped around the sides of the three magnetic core middle columns 1;

[0036] A second iron yoke 4, which is located on the surface of the three magnetic core middle columns 1 away from the first iron yoke 3;

[0037] The side yoke 5 is located on one side of the three core middle columns 1, one end of the side yoke 5 is connected to the first iron yoke 3, and the other end of the side yoke 5 is connected to the second iron yoke 4;

[0038] The magnetic permeability of the core center column 1 is smaller than the magnetic permeability of the first iron yoke 3 , the magnetic permeability of the core center column 1 is smaller than the magnetic permeability of the second iron yoke 4 , and the magnetic permeability of the core center column 1 is smaller than the magnetic permeability of the side yoke 5 .

[0039] The material of the magnetic core column 1 can be magnetic core powder. The materials of the first iron yoke 3, the second iron yoke 4 and the side yoke 5 can be the same or different, and can be nanocrystalline materials. The inductor 2 can be a flat copper wire vertically wound hollow inductor.

[0040] Specifically, the three wires of the three-phase electricity are respectively connected to the inductors 2 on the three magnetic core columns 1. By setting the magnetic core column 1 to use a material with relatively low magnetic permeability, and setting the first iron yoke 3 and the second iron yoke 4 to use a material with relatively high magnetic permeability, after the inductor 2 is connected to the three-phase electricity, for the differential mode current, the vector sum of the currents flowing through the three inductors 2 is zero. In the three-phase electricity, the vector sum of the magnetic flux generated by the differential mode current in the three inductors 2 at the iron yoke is zero. At this time, the magnetic potential is mainly concentrated in the three magnetic core columns 1, and the differential mode magnetic circuits of the three groups of inductors are only at the magnetic core column 1, so that the inductance characteristics of the three groups of inductors are the same, and the inductance is the same, thereby effectively filtering out the differential mode noise generated in the three-phase electricity. At the same time, the side yoke 5 is set to use a material with higher magnetic permeability, and the magnetic core center column 1 is set to use a material with relatively low magnetic permeability. After the inductor 2 is connected to the three-phase power, for the common-mode current, the common-mode currents generated by the three inductors 2 have the same direction. At this time, the magnetic flux generated by the common-mode current in the three inductors 2 returns at the iron yoke and flows back to the magnetic core center column 1 through the side yoke 5, effectively filtering out the common-mode noise generated in the three-phase power.

[0041] Compared with the prior art in which the common mode inductor and the differential mode inductor are independently set, the three-phase differential common mode inductor set in the embodiment of the utility model integrates the three separate differential mode inductors, thereby reducing the volume and manufacturing cost of the three-phase differential common mode inductor. One end of the side yoke 5 is connected to the first iron yoke 3, and the other end of the side yoke 5 is connected to the second iron yoke 4, so that the magnetic flux generated by the common mode current in the three inductor coils 2 is circulated at the iron yoke, and then flows back to the core column 1 through the side yoke 5, effectively filtering out the common mode noise generated in the three-phase electricity, having the use effect of the common mode inductor, which is equivalent to integrating the common mode inductor and the differential mode inductor, further reducing the volume and manufacturing cost of the three-phase differential common mode inductor, and miniaturizing the design of the controller. At the same time, the number of turns of the output line of the common mode inductor in the prior art is usually one, and the embodiment of the utility model reuses the coil of the three-phase differential mode inductor on the common mode inductor, increasing the number of turns of the coil of the common mode inductor and improving the inductance of the common mode inductor.

[0042] For further information, please refer to Figure 1 and Figure 3 The size of the orthographic projection of the second yoke 4 in the first direction of the first yoke 3 is smaller than the size of the orthographic projection of the inductor 2 in the first direction of the first yoke 3 , and the first direction is perpendicular to the direction from the first yoke 3 to the second yoke 4 .

[0043] Specifically, the size of the orthographic projection of the second iron yoke 4 in the first direction of the first iron yoke 3 is set to be smaller than the size of the orthographic projection of the inductor 2 in the first direction of the first iron yoke 3, which can ensure that the inductor 2 can generate a larger parasitic inductance, and thus can effectively filter out the differential mode noise and common mode noise generated in the three-phase electricity.

[0044] For further information, please refer to Figure 1 and Figure 2 The surface of the side yoke 5 away from the first iron yoke 3 is flush with the surface of the second iron yoke 4 away from the first iron yoke 3 ; the surface of the side yoke 5 away from the second iron yoke 4 is flush with the surface of the first iron yoke 3 away from the second iron yoke 4 .

[0045] Specifically, the surface of the side yoke 5 away from the first iron yoke 3 is flush with the surface of the second iron yoke 4 away from the first iron yoke 3; the surface of the side yoke 5 away from the second iron yoke 4 is flush with the surface of the first iron yoke 3 away from the second iron yoke 4, which can ensure that the structure of the three-phase differential common-mode inductor designed in the embodiment of the utility model is flatter, thereby making the placement of the three-phase differential common-mode inductor more convenient.

[0046] For further information, please refer to Figure 1-Figure 3 The size of the orthographic projection of the side yoke 5 in the first direction of the first iron yoke 3 is equal to the size of the orthographic projection of the second iron yoke 4 in the first direction of the first iron yoke 3.

[0047] Specifically, setting the size of the side yoke 5 on the first iron yoke 3 in the first direction to be equal to the size of the second iron yoke 4 on the first iron yoke 3 in the first direction can further ensure that the structure of the three-phase differential common-mode inductor designed in the embodiment of the utility model is more flush, thereby making the placement of the three-phase differential common-mode inductor more convenient.

[0048] For further information, please refer to Figure 1-Figure 3 The three core columns 1 are arranged at equal intervals and in parallel on the surface of the first iron yoke 3 .

[0049] Specifically, three magnetic core columns 1 are arranged at equal intervals and in parallel on the surface of the first iron yoke 3. After the inductor 2 is connected to three-phase power, for the differential mode current, it can further ensure that the vector sum of the currents flowing through the three inductors 2 is zero. In the three-phase power, the vector sum of the magnetic flux generated by the differential mode current in the three inductors 2 at the iron yoke is zero, thereby making the inductance characteristics of the three groups of inductors the same and the inductance the same, which can further effectively filter out the differential mode noise generated in the three-phase power.

[0050] For further information, please refer to Figure 1 and Figure 3 The center line a1 of the side yoke 5 along the second direction and the center line a2 of each magnetic core center column 1 along the second direction are on the same plane; wherein the second direction is the direction from the first iron yoke 3 to the second iron yoke 4.

[0051] Specifically, arranging the center line a1 of the side yoke 5 along the second direction and the center line a2 of each magnetic core center column 1 along the second direction on the same plane can make the structure of the three-phase difference common mode inductor designed in the embodiment of the utility model more symmetrical.

[0052] For further information, please refer to Figure 1-Figure 3 The size of the orthographic projection of the core column 1 in the first direction on the first iron yoke 3 is smaller than the size of the first iron yoke 3 in the first direction; the size of the orthographic projection of the core column 1 in the first direction on the second iron yoke 4 is smaller than the size of the second iron yoke 4 in the first direction.

[0053] Specifically, the size of the orthographic projection of the core column 1 on the first iron yoke 3 in the first direction is set to be smaller than the size of the first iron yoke 3 in the first direction; the size of the orthographic projection of the core column 1 on the second iron yoke 4 in the first direction is smaller than the size of the second iron yoke 4 in the first direction. This can not only effectively filter out the differential mode noise and common mode noise generated in the three-phase electricity, but also avoid the generation of a large inductance due to the excessive diameter of the core column 1, thereby affecting the output of the three-phase electricity.

[0054] Furthermore, the magnetic core center column is a magnetic powder core center column.

[0055] Specifically, the core center column is set to be a magnetic powder core core center column, which can make the magnetic permeability of the three core center columns higher. Combined with the first iron yoke, the second iron yoke and the side yoke with lower magnetic permeability, the three-phase differential common-mode inductor designed by the utility model can simultaneously have the effect of filtering the differential-mode noise and common-mode noise generated in the three-phase electricity.

[0056] Furthermore, the iron yoke is a nanocrystalline iron yoke; and the side yoke is a nanocrystalline side yoke.

[0057] Specifically, the first iron yoke is set to be a nanocrystalline iron yoke, the second iron yoke is set to be a nanocrystalline iron yoke, and the side yoke is set to be a nanocrystalline iron yoke, so that the magnetic permeability of the first iron yoke, the second iron yoke and the side yoke can be lower. Combined with the use of a magnetic core center column with higher magnetic permeability, the three-phase differential common-mode inductor designed by the utility model can simultaneously have the effect of filtering the differential-mode noise and common-mode noise generated in the three-phase electricity.

[0058] Furthermore, the inductor coil is a hollow inductor coil made of flat copper wire.

[0059] Specifically, the inductor coil is set to be a flat copper wire vertically wound hollow inductor coil, which can make the flat copper wire wound more tightly and flatter, increase the effective area of ​​the wire, make full use of the limited assembly space of the magnetic core, achieve the lowest DC resistance under the same volume, greatly reduce the copper loss of the product, and increase the temperature rise current of the product.

[0060] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0061] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A three-phase differential common mode inductor, characterized in that: include: Three core columns, three inductance coils, a first iron yoke, a second iron yoke and a side yoke; First Iron Yoke; The three magnetic core center columns are located on the surface of the first iron yoke; The three inductor coils are respectively wrapped around the side surfaces of the three magnetic core middle columns; A second iron yoke, wherein the second iron yoke is located on a surface of the three magnetic core middle columns away from the first iron yoke; The side yoke is located on one side of the central column of the three magnetic cores, one end of the side yoke is connected to the first iron yoke, and the other end of the side yoke is connected to the second iron yoke; The magnetic permeability of the core center column is smaller than the magnetic permeability of the first iron yoke, the magnetic permeability of the core center column is smaller than the magnetic permeability of the second iron yoke, and the magnetic permeability of the core center column is smaller than the magnetic permeability of the side yoke.

2. The three-phase differential common mode inductor according to claim 1, characterized in that: The size of the orthographic projection of the second iron yoke on the first iron yoke in the first direction is smaller than the size of the orthographic projection of the inductor on the first iron yoke in the first direction, and the first direction is perpendicular to the direction from the first iron yoke to the second iron yoke.

3. The three-phase differential common mode inductor according to claim 1, characterized in that: The surface of the side yoke away from the first iron yoke is flush with the surface of the second iron yoke away from the first iron yoke; the surface of the side yoke away from the second iron yoke is flush with the surface of the first iron yoke away from the second iron yoke.

4. The three-phase differential common mode inductor according to claim 2, characterized in that: The size of the orthographic projection of the side yoke on the first iron yoke in the first direction is equal to the size of the orthographic projection of the second iron yoke on the first iron yoke in the first direction.

5. The three-phase differential common mode inductor according to claim 1, characterized in that: The three magnetic core center columns are arranged at equal intervals and in parallel on the surface of the first iron yoke.

6. The three-phase differential common mode inductor according to claim 1, characterized in that: The center line of the side yoke along the second direction and the center line of each of the core middle columns along the second direction are on the same plane; wherein the second direction is the direction from the first iron yoke to the second iron yoke.

7. The three-phase differential common mode inductor according to claim 2, characterized in that: The size of the orthographic projection of the center column of the magnetic core on the first iron yoke in the first direction is smaller than the size of the first iron yoke in the first direction; the size of the orthographic projection of the center column of the magnetic core on the second iron yoke in the first direction is smaller than the size of the second iron yoke in the first direction.

8. The three-phase differential common mode inductor according to claim 1, characterized in that: The magnetic core center column is a magnetic powder core center column.

9. The three-phase differential common mode inductor according to claim 1, characterized in that: The iron yoke is a nanocrystalline iron yoke; The side yoke is a nanocrystalline side yoke.

10. The three-phase differential common mode inductor according to claim 1, characterized in that: The inductor coil is a hollow inductor coil wound vertically with flat copper wire.

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