Three-phase magnetic integrated inductor and two-phase magnetic integrated inductor

Abstract

The utility model discloses a three-phase magnetic integrated inductor and a two-phase magnetic integrated inductor. The three-phase magnetic integrated inductor comprises an upper cover magnetic core, a lower cover magnetic core, a first side column, a second side column, a third side column, a fourth side column, a first coil, a second coil and a third coil. The lower cover magnetic core is horizontally arranged and connected with the first side column, the second side column, the third side column and the fourth side column, and the first side column, the second side column, the third side column and the fourth side column are used for supporting the upper cover magnetic core and connected with the upper cover magnetic core. The first coil, the second coil and the third coil are wound on the upper cover magnetic core and / or the lower cover magnetic core, the first coil is arranged in a gap formed by the first side column and the second side column, the second coil is arranged in a gap formed by the second side column and the third side column, and the third coil is arranged in a gap formed by the third side column and the fourth side column. According to the technical scheme, the size of the three-phase magnetic integrated inductor is reduced, and the manufacturing difficulty is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of inductance, in particular to a three-phase magnetic integrated inductor and a two-phase magnetic integrated inductor. Background Art

[0002] For converter products such as PWM (Pulse Width Modulation) rectifiers, photovoltaic inverters, and new energy storage converters, filter inductors are usually required to filter out the harmonics generated when the converter is working. In the existing technology, three-phase three-column filter inductors (such as Figure 1 As shown) or single-phase filter inductor (as Figure 2 as shown) or an improved three-phase magnetic integrated inductor (such as Figure 3 As shown). However, the three-phase three-column filter inductor has an unsatisfactory effect in the case of an unbalanced power grid containing zero-sequence current because the inductor has no zero-sequence magnetic flux path. Although the filter inductor using a single-phase structure can adapt to the working conditions of an unbalanced power grid, since each phase needs to be equipped with a single-phase filter inductor, the number is large, resulting in a large overall volume and high cost, which cannot meet the industry development needs of small volume, low cost and light weight. The use of an improved three-phase magnetic integrated inductor can better solve the shortcomings of three-phase three-column inductors and single-phase inductors, but the existing three-phase magnetic integrated inductor, for example: Chinese utility model patent, patent number 202321198999.6, patent name magnetic core structure and three-phase magnetic integrated inductor, adopts a multi-layer stacking form. In actual production and processing, the manufacturing process is complicated and not convenient for mass production. In particular, with the continuous increase in the power of the converter, the volume, cost and weight of the single-phase filter inductor used to suppress harmonics have increased significantly, greatly increasing the cost and volume of the three-phase magnetic integrated inductor. Utility Model Content

[0003] The utility model aims to provide a three-phase magnetic integrated inductor to solve the problems of large filter inductor volume and high manufacturing difficulty.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A three-phase magnetic integrated inductor, comprising:

[0006] An upper cover magnetic core, a lower cover magnetic core, a first side column, a second side column, a third side column, a fourth side column, a first coil, a second coil and a third coil;

[0007] The lower cover magnetic core is arranged horizontally, and the lower cover magnetic core is connected to the first side column, the second side column, the third side column, and the fourth side column respectively, and the first side column, the second side column, the third side column, and the fourth side column are all used to support the upper cover magnetic core and are connected to the upper cover magnetic core;

[0008] The first coil, the second coil and the third coil are wound around the upper cover magnetic core and / or the lower cover magnetic core, and the first coil is arranged in a gap formed by the first side column and the second side column, the second coil is arranged in a gap formed by the second side column and the third side column, and the third coil is arranged in a gap formed by the third side column and the fourth side column.

[0009] In one embodiment, the first coil and the second coil are wound in the same direction.

[0010] In one embodiment, the winding directions of the first coil and the second coil are opposite.

[0011] In one embodiment, the upper cover magnetic core and / or the lower cover magnetic core are formed by splicing a plurality of magnetic cores.

[0012] In one embodiment, the first side column, the second side column, the third side column, and the fourth side column are respectively formed by splicing a plurality of magnetic cores.

[0013] Compared with the prior art, the three-phase magnetic integrated inductor of the utility model has the following beneficial effects:

[0014] When the three-phase magnetic integrated inductor is in use, the first coil and the second coil share the second side column; the second coil and the third coil share the third side column, thereby reducing the number of side columns and the volume of the three-phase inductor, thereby reducing the cost, compared with the three-phase filter inductor composed of a single-phase filter inductor. On the other hand, the existing magnetic integrated inductors are in the form of multi-layer stacking, so the strength of the magnetic core of the lower layer is required to be high, which is not convenient for mass production. The lower cover magnetic core of the three-phase magnetic integrated inductor of the utility model is arranged along the horizontal plane, which improves the stability of the three-phase magnetic integrated inductor structure and is convenient for mass production and application.

[0015] On the basis of the above technical solution, the utility model also proposes a two-phase magnetic integrated inductor, comprising:

[0016] An upper cover magnetic core, a lower cover magnetic core, a first side column, a second side column, a third side column, a first coil and a second coil;

[0017] The lower cover magnetic core is arranged horizontally, and the lower cover magnetic core is connected to the first side column, the second side column, and the third side column respectively. The first side column, the second side column, and the third side column are all used to support the upper cover magnetic core and are connected to the upper cover magnetic core;

[0018] The first coil and the second coil are wound around the upper cover magnetic core and / or the lower cover magnetic core, and the first coil is arranged in the interval formed by the first side column and the second side column, and the second coil is arranged in the interval formed by the second side column and the third side column.

[0019] In one embodiment, the first coil and the second coil are wound in the same direction.

[0020] In one embodiment, the winding directions of the first coil and the second coil are opposite.

[0021] In one embodiment, the upper cover magnetic core and / or the lower cover magnetic core are formed by splicing a plurality of magnetic cores; or, the upper cover magnetic core and the lower cover magnetic core are both a whole magnetic core.

[0022] In one embodiment, the first side column, the second side column, and the third side column are respectively formed by splicing a plurality of magnetic cores; or, the first side column, the second side column, and the third side column are respectively formed by a whole magnetic core.

[0023] Compared with the prior art, the two-phase magnetic integrated inductor of the utility model has the following beneficial effects:

[0024] When the two-phase magnetic integrated inductor is in use, the first coil and the second coil share the second side column; thus, compared with the single-phase filter inductor combined to form a two-phase filter inductor, the number of side columns set is reduced, the volume of the two-phase magnetic integrated inductor is reduced, and the cost is reduced. On the other hand, the magnetic flux direction of the zero-sequence current of the second coil is opposite to the magnetic flux direction of the differential mode current in the second side column, and the two magnetic fluxes in the second side column are partially offset; thereby reducing the loss of the second side column and improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0027] Figure 1 It is a structural schematic diagram of a prior art;

[0028] Figure 2 It is a structural schematic diagram of a prior art;

[0029] Figure 3 It is a structural schematic diagram of a prior art;

[0030] Figure 4 This is a schematic structural diagram of an embodiment of a three-phase magnetic integrated inductor of the utility model;

[0031] Figure 5 for Figure 4 Schematic diagram of the differential mode current flux path of the three-phase magnetic integrated inductor;

[0032] Figure 6 for Figure 4 Schematic diagram of zero-sequence current flux path of three-phase magnetic integrated inductor;

[0033] Figure 7 This is a schematic structural diagram of an embodiment of a three-phase magnetic integrated inductor of the utility model;

[0034] Figure 8 It is a structural schematic diagram of another embodiment of the three-phase magnetic integrated inductor of the utility model;

[0035] Fig. 9 This is a schematic structural diagram of an embodiment of a three-phase magnetic integrated inductor of the utility model;

[0036] Fig.10 This is a schematic structural diagram of an embodiment of a three-phase magnetic integrated inductor of the utility model;

[0037] Fig.11 It is a structural schematic diagram of another embodiment of the three-phase magnetic integrated inductor of the utility model;

[0038] Fig.12 It is a structural schematic diagram of another embodiment of the three-phase magnetic integrated inductor of the utility model;

[0039] Fig.13 It is a structural schematic diagram of an embodiment of a two-phase magnetic integrated inductor of the utility model.

[0040] Illustration: 100, three-phase magnetic integrated inductor; 110, upper cover magnetic core; 120, lower cover magnetic core; 131, first side column; 132, second side column; 133, third side column; 134, fourth side column; 141, first coil; 142, second coil; 143, third coil;

[0041] 100', two-phase magnetic integrated inductor; 110', upper cover magnetic core; 120', lower cover magnetic core;

[0042] 131', first side column; 132', second side column; 133', third side column; 141', first coil; 142', second coil. DETAILED DESCRIPTION

[0043] In order to make the technical purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme 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 embodiment described below 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 are within the scope of protection of the utility model.

[0044] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0045] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0046] The existing technology usually adopts a three-phase three-column filter inductor (such as Figure 1 As shown) or single-phase filter inductor (as Figure 2 as shown) or an improved three-phase magnetic integrated inductor (such as Figure 3As shown). However, the three-phase three-column filter inductor has an unsatisfactory effect in the case of an unbalanced power grid containing zero-sequence current because the inductor has no zero-sequence magnetic flux path. Although the filter inductor using a single-phase structure can adapt to the working conditions of an unbalanced power grid, since each phase needs to be equipped with a single-phase filter inductor, the number is large, resulting in a large overall volume and high cost, which cannot meet the industry development needs of small volume, low cost and light weight. The use of an improved three-phase magnetic integrated inductor can better solve the shortcomings of three-phase three-column inductors and single-phase inductors, but the existing three-phase magnetic integrated inductor, for example: Chinese utility model patent, patent number 202321198999.6, patent name magnetic core structure and three-phase magnetic integrated inductor, adopts a multi-layer stacking form. In actual production and processing, the manufacturing process is complicated and not convenient for mass production. In particular, with the continuous increase in the power of the converter, the volume, cost and weight of the single-phase filter inductor used to suppress harmonics have increased significantly, greatly increasing the cost and volume of the three-phase magnetic integrated inductor.

[0047] An embodiment of the utility model provides a three-phase magnetic integrated inductor 100 .

[0048] See also Figures 4 to 8 The three-phase magnetic integrated inductor 100 includes an upper cover magnetic core 110, a lower cover magnetic core 120, a first side column 131, a second side column 132, a third side column 133, a fourth side column 134, a first coil 141, a second coil 142 and a third coil 143;

[0049] The lower cover magnetic core 120 is arranged horizontally, and the lower cover magnetic core 120 is respectively connected to the first side column 131, the second side column 132, the third side column 133, and the fourth side column 134. The first side column 131, the second side column 132, the third side column 133, and the fourth side column 134 are all used to support the upper cover magnetic core 110 and are connected to the upper cover magnetic core 110;

[0050] The first coil 141, the second coil 142 and the third coil 143 are wound around the upper cover magnetic core 110 and / or the lower cover magnetic core 120, and the first coil 141 is arranged in the interval formed by the first side column 131 and the second side column 132, the second coil 142 is arranged in the interval formed by the second side column 132 and the third side column 133, and the third coil 143 is arranged in the interval formed by the third side column 133 and the fourth side column 134.

[0051] It should be noted that, when in use, the first coil 141 and the second coil 142 share the second side column 132; the second coil 142 and the third coil 143 share the third side column 133, thereby reducing the number of side columns set, reducing the volume of the three-phase inductor, and reducing the cost compared to the three-phase filter inductor composed of a single-phase filter inductor. On the other hand, the first coil 141, the second coil 142, and the third coil 143 are respectively wound on the upper cover magnetic core 110 and / or the lower cover magnetic core 120, providing Figure 5 The flux path of the differential mode current is shown, and also provides Figure 6 The magnetic flux path of the zero-sequence current is shown. Therefore, when the three-phase magnetic integrated inductor 100 is applied under the unbalanced power grid condition containing zero-sequence current, the magnetic flux direction of the zero-sequence current of the second coil 142 is opposite to the magnetic flux direction of the differential mode current in the second side column 132, and the two magnetic fluxes in the second side column 132 are partially offset; the magnetic flux direction of the zero-sequence current of the third coil 143 is opposite to the magnetic flux direction of the differential mode current in the third side column 133, and the two magnetic fluxes in the third side column 133 are partially offset, thereby reducing the loss of the second side column 132 and the third side column 133 and improving the working efficiency.

[0052] On the other hand, the existing magnetic integrated inductor adopts a multi-layer stacking form, so the strength of the magnetic core of the lower layer is required to be high, which is not convenient for mass production. However, the lower cover magnetic core 120 of the three-phase magnetic integrated inductor 100 of the utility model is arranged along the horizontal plane, which improves the structural stability of the three-phase magnetic integrated inductor 100 and is convenient for mass production and application.

[0053] It should also be noted that the upper cover magnetic core 110, the lower cover magnetic core 120, the first side column 131, the second side column 132, the third side column 133, and the fourth side column 134 are all composed of magnetic cores, which can be magnetic cores of the same material or magnetic cores of different materials. Specifically, the type of magnetic core material can be selected according to the specific application product.

[0054] It is also necessary to note that, please refer to Figure 7 and Figure 8 The first coil 141, the second coil 142, and the third coil 143 can be wound around the upper cover magnetic core 110 or the lower cover magnetic core 120; it can be understood that winding the first coil 141, the second coil 142, and the third coil 143 all around the upper cover magnetic core 110, or all around the lower cover magnetic core 120, is convenient for optimizing the external structure of the three-phase magnetic integrated inductor 100 to adapt to different application products, improve the space utilization of the product, and reduce the volume of the application product.

[0055] It is also necessary to note that, please refer to Figure 4When the first coil 141, the second coil 142, and the third coil 143 are wound around the upper cover magnetic core 110 and the lower cover magnetic core 120 at the same time, the inductor structure is made more symmetrical, and the magnetic flux in the upper cover magnetic core 110 and the lower cover magnetic core 120 is made more balanced, thereby improving the space utilization of the three-phase magnetic integrated inductor 100 itself and reducing the volume of the three-phase magnetic integrated inductor 100.

[0056] See also Figure 4 , Figure 7 and Figure 8 In one embodiment of the utility model, the winding directions of the first coil 141, the second coil 142 and the third coil 143 are the same. It can be understood that the same winding direction increases the total inductance of the magnetic integrated inductor, reduces the magnetic field leakage, and improves the efficiency of the magnetic integrated inductor; on the other hand, it simplifies the installation and design of the three-phase magnetic integrated inductor 100 and reduces the manufacturing cost. Specifically, if the winding directions of the coils are the same, the positive poles of the first coil 141, the second coil 142 and the third coil 143 are on the same side of the three-phase magnetic integrated inductor 100, which reduces unnecessary wiring and facilitates installation.

[0057] See also Fig. 9 In another embodiment of the utility model, the winding directions of the first coil 141 and the second coil 142 are opposite. It can be understood that when the winding directions of the first coil 141 and the second coil 142 are opposite, when the differential mode current flows, the magnetic flux in the upper cover magnetic core 110 and the lower cover magnetic core 120 is smaller, thereby reducing the magnetic flux density of the upper cover magnetic core 110 and the lower cover magnetic core 120 and reducing the magnetic core loss of the upper cover magnetic core 110 and the lower cover magnetic core 120. And when the common mode current flows, the common mode magnetic flux of the three phases takes their own magnetic flux paths, and the length of the common mode magnetic path is shortened, thereby reducing the magnetic flux leakage.

[0058] See also Fig.10 and Fig.11 In a preferred embodiment of the present utility model, the upper cover magnetic core 110 and / or the lower cover magnetic core 120 are formed by splicing a plurality of magnetic cores.

[0059] It can be understood that when the upper cover magnetic core 110 is formed by splicing multiple magnetic cores, when the first coil 141, the second coil 142, and the third coil 143 are wound on the outer surface of the upper cover magnetic core 110, the first coil 141, the second coil 142, and the third coil 143 can be pre-wound on different magnetic cores, and then the multiple magnetic cores are spliced ​​to form the upper cover magnetic core 110 with coils wound around it.

[0060] See also Fig.12In another preferred embodiment of the present invention, the first side column 131, the second side column 132, the third side column 133, and the fourth side column 134 are respectively formed by splicing a plurality of magnetic cores.

[0061] It is understandable that by splicing multiple magnetic cores, smaller magnetic materials can be used, reducing costs. At the same time, different shapes and core materials can be flexibly combined to meet the needs of different application scenarios and better adapt to the size limitations of product design. On the other hand, by splicing multiple magnetic cores, it is easier to maintain and replace the magnetic core. If a part is damaged or aged, only that part needs to be replaced, rather than the entire side column.

[0062] See also Fig.13 ,The embodiment of the utility model also proposes a two-phase magnetic integrated inductor 100', which includes: an upper cover magnetic core 110', a lower cover magnetic core 120', a first side column 131', a second side column 132', a third side column 133', a first coil 141' and a second coil 142';

[0063] The lower cover magnetic core 120' is arranged horizontally, and the lower cover magnetic core 120' is connected to the first side column 131', the second side column 132', and the third side column 133' respectively. The first side column 131', the second side column 132', and the third side column 133' are all used to support the upper cover magnetic core 110' and are connected to the upper cover magnetic core 110';

[0064] The first coil 141' and the second coil 142' are wound around the upper cover magnetic core 110' and / or the lower cover magnetic core 120', and the first coil 141' is arranged in the interval formed by the first side column 131' and the second side column 132', and the second coil 142' is arranged in the interval formed by the second side column 132' and the third side column 133'.

[0065] It should be noted that, when in use, the first coil 141' and the second coil 142' share the second side column 132'; thus, compared with the single-phase filter inductor combination to form a two-phase filter inductor, the number of side columns set is reduced, the volume of the two-phase magnetic integrated inductor is reduced, and the cost is reduced. On the other hand, the direction of the zero-sequence magnetic flux of the first coil 141' in the second side column 132' is opposite to the direction of the zero-sequence magnetic flux of the second coil 142' in the second side column 132', so that the zero-sequence magnetic flux in the second side column 132' is offset; thereby reducing the loss of the second side column 132' and improving work efficiency.

[0066] In one embodiment, the first coil 141 ′ and the second coil 142 ′ are wound in the same direction.

[0067] In one embodiment, the winding directions of the first coil 141 ′ and the second coil 142 ′ are opposite.

[0068] In one embodiment, the upper cover magnetic core 110 ′ and / or the lower cover magnetic core 120 ′ are formed by splicing a plurality of magnetic cores; or, the upper cover magnetic core and the lower cover magnetic core are both a whole magnetic core.

[0069] In one embodiment, the first side column 131 ′, the second side column 132 ′, and the third side column 133 ′ are respectively formed by splicing a plurality of magnetic cores; or, the first side column, the second side column, and the third side column are respectively formed by a whole magnetic core.

[0070] In the above embodiment, the specific embodiment features of the upper cover core 110', the lower cover core 120', the first side column 131', the second side column 132', the third side column 133', the first coil 141' and the second coil 142' in the two-phase magnetic integrated inductor 100' are selected from any one or a combination of the features of the corresponding upper cover core 110, the lower cover core 120, the first side column 131, the second side column 132, the third side column 133, the first coil 141 and the second coil 142 in the above-mentioned three-phase magnetic integrated inductor 100. Therefore, the above features have the same beneficial effects on the two-phase magnetic integrated inductor 100', which will not be repeated here one by one.

[0071] In summary, the three-phase magnetic integrated inductor 100 or two-phase magnetic integrated inductor 100' of the utility model technical solution can not only adapt to the working conditions of unbalanced power grids, but also solve the problems of high cost and large volume caused by using multiple single-phase filter inductors, and can also solve the limitations and shortcomings of existing three-phase magnetic integrated inductor solutions. The utility model technical solution is particularly suitable for filtering medium and large power converters, such as photovoltaic systems, electrochemical energy storage systems and other medium and large power converters. This technology has huge economic value and broad market prospects.

[0072] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A three-phase magnetic integrated inductor, characterized in that: include: An upper cover magnetic core, a lower cover magnetic core, a first side column, a second side column, a third side column, a fourth side column, a first coil, a second coil and a third coil; The lower cover magnetic core is arranged horizontally, and the lower cover magnetic core is connected to the first side column, the second side column, the third side column, and the fourth side column respectively, and the first side column, the second side column, the third side column, and the fourth side column are all used to support the upper cover magnetic core and are connected to the upper cover magnetic core; The first coil, the second coil and the third coil are wound around the upper cover magnetic core and / or the lower cover magnetic core, and the first coil is arranged in a gap formed by the first side column and the second side column, the second coil is arranged in a gap formed by the second side column and the third side column, and the third coil is arranged in a gap formed by the third side column and the fourth side column.

2. The three-phase magnetic integrated inductor according to claim 1, characterized in that: The first coil and the second coil are wound in the same direction.

3. The three-phase magnetic integrated inductor according to claim 1, characterized in that: The first coil and the second coil are wound in opposite directions.

4. The three-phase magnetic integrated inductor according to claim 1, characterized in that: The upper cover magnetic core and / or the lower cover magnetic core are formed by splicing a plurality of magnetic cores.

5. The three-phase magnetic integrated inductor according to claim 1, characterized in that: The first side column, the second side column, the third side column and the fourth side column are respectively formed by splicing a plurality of magnetic cores.

6. A two-phase magnetic integrated inductor, characterized in that: include: An upper cover magnetic core, a lower cover magnetic core, a first side column, a second side column, a third side column, a first coil and a second coil; The lower cover magnetic core is arranged horizontally, and the lower cover magnetic core is connected to the first side column, the second side column, and the third side column respectively. The first side column, the second side column, and the third side column are all used to support the upper cover magnetic core and are connected to the upper cover magnetic core; The first coil and the second coil are wound around the upper cover magnetic core and / or the lower cover magnetic core, and the first coil is arranged in the interval formed by the first side column and the second side column, and the second coil is arranged in the interval formed by the second side column and the third side column.

7. The two-phase magnetic integrated inductor according to claim 6, characterized in that: The first coil and the second coil are wound in the same direction.

8. The two-phase magnetic integrated inductor according to claim 6, characterized in that: The first coil and the second coil are wound in opposite directions.

9. The two-phase magnetic integrated inductor according to claim 6, characterized in that: The upper cover magnetic core and / or the lower cover magnetic core are formed by splicing multiple magnetic cores; Alternatively, the upper cover magnetic core and the lower cover magnetic core are both integral magnetic cores.

10. The two-phase magnetic integrated inductor according to claim 6, characterized in that: The first side column, the second side column and the third side column are respectively formed by splicing a plurality of magnetic cores; Alternatively, the first side column, the second side column, and the third side column are respectively formed by a whole magnetic core.

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