Coil structure and transformer

Abstract

The utility model relates to a coil structure and a transformer. The coil structure comprises a core column, a primary coil and a plurality of secondary coils. Wherein the primary coil is wound on the core column. Each secondary coil comprises a plurality of coil sections which are wound on the core column and on one side of the primary coil, the coil sections in each secondary coil are sequentially connected in series or mutually connected in parallel, and the coil sections in the secondary coils are sequentially and alternately arranged in the axial direction of the core column. When current is supplied to the primary coil, each secondary coil can induce voltage under the action of a magnetic field, so that the requirement of providing a plurality of output voltages to the outside can be met. Due to the fact that the distance between the coil sections in the coil structure is small, and the coil sections in the multiple secondary coils are sequentially and alternately arranged in the axial direction of the core column, the coil structure can enable the magnetic potential of each secondary coil to be evenly distributed, impedance deviation between the secondary coils is reduced, and the coil structure has the advantages of being simple in structure and convenient to use. And the effect of improving the downstream power utilization quality is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a coil structure and a transformer. Background Art

[0002] As the market share of electric vehicles continues to increase, the supporting transformers for charging equipment such as charging piles need to output multiple low voltages from a high voltage input, such as 10kV input and multiple 200V outputs.

[0003] In order to meet the voltage transformation requirements, traditional transformers use a coil structure in which multiple sets of secondary coils are arranged and distributed along the axial direction of the transformer core. However, although such a coil structure can meet the voltage transformation requirements, since the leakage magnetic position of each secondary coil corresponding to the transformer is different in the axial direction of the core, this also leads to uneven magnetic potential distribution of each secondary coil, which in turn leads to a large impedance deviation between each secondary coil, which seriously affects the power quality of downstream electrical equipment. Summary of the invention

[0004] Based on this, it is necessary to provide a coil structure and a transformer that can effectively reduce the impedance deviation between secondary coils to address the above problems.

[0005] A coil structure, comprising:

[0006] core column;

[0007] A primary coil, the primary coil is wound around the core column;

[0008] A plurality of secondary coils, each of the secondary coils comprises a plurality of coil segments wound around the core column and located on one side of the primary coil, the plurality of coil segments in each secondary coil are sequentially connected in series or in parallel with each other, and the coil segments in the plurality of secondary coils are sequentially alternately arranged along the axial direction of the core column.

[0009] The technical solution is further described below:

[0010] In one embodiment, the numbers of turns of the multiple secondary coils are the same or different.

[0011] In one embodiment, the plurality of coil segments in each of the secondary coils are arranged evenly spaced apart along the axial direction of the core column.

[0012] In one embodiment, the number of the secondary coils is three or five.

[0013] A transformer comprises the above coil structure.

[0014] In one of the embodiments, the transformer includes a three-dimensional wound core, and the three-dimensional wound core includes three coil structures. The three coil structures are arranged in a triangle, and the three coil structures are used to respectively pass currents of three different phases.

[0015] In one embodiment, the transformer further includes three primary input terminals and a plurality of secondary output terminals, the three primary input terminals are electrically connected to the three primary coils in a one-to-one correspondence, and the plurality of secondary output terminals are connected to the plurality of secondary coils in a one-to-one correspondence.

[0016] In one embodiment, the transformer further includes a clamp connected to the core column, and the clamp is used to fix the primary coil and the plurality of secondary coils to the core column.

[0017] In one embodiment, the clamp includes a first clamp and a second clamp, the first clamp and the second clamp are respectively located at two ends of the core column and are both connected to the core column, and the first clamp and the second clamp are used to jointly fix the primary coil and the multiple secondary coils.

[0018] In one embodiment, the transformer further includes a mounting bracket connected to a side of the second clamp facing away from the first clamp.

[0019] In the above coil structure and transformer, the primary coil and multiple secondary coils are all wound around the core column, so that when current is passed through the primary coil, each secondary coil can induce a voltage under the action of the magnetic field, thereby meeting the need to provide multiple output voltages to the outside. Each secondary coil includes multiple coil segments, and each coil segment in the multiple secondary coils is alternately arranged in sequence along the axial direction of the core column, so that two adjacent coil segments belong to different secondary coils. Compared with the spacing between the secondary coils in the traditional coil structure, the spacing between the coil segments in the coil structure is smaller. Therefore, when the coil structure is applied to the transformer, the leakage magnetic positions of the transformer corresponding to the two adjacent coil segments tend to be the same, thereby reducing the magnetic potential deviation between each coil segment. Therefore, when the multiple coil segments in each secondary coil are connected in series or in parallel, the magnetic potential of each secondary coil is evenly distributed in the axial direction of the core column, thereby reducing the impedance deviation between each secondary coil, achieving the effect of improving the downstream power quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0023] FIG. 1 is a schematic structural diagram of a traditional coil structure.

[0024] FIG. 2 is a schematic structural diagram of a coil structure in an embodiment of the present application.

[0025] FIG. 3 is a schematic structural diagram of a coil structure in an embodiment of the present application.

[0026] FIG. 4 is a schematic diagram of the structure of a transformer in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 100, coil structure; 110, primary coil; 120, core column; 130, secondary coil; 131, coil segment; 132, coil column; 200, transformer; 210, three-dimensional wound core; 220, secondary output terminal; 230, clamp; 231, second clamp; 232, second clamp; 240, mounting frame; 250, primary input terminal. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] Referring to FIG. 1 , FIG. 1 shows a schematic diagram of a conventional coil structure, which comprises a core column 120, a primary coil 110 and a plurality of secondary coils 130, wherein the primary coil 110 and the plurality of secondary coils 130 are both wound on the core column 120, the plurality of secondary coils 130 are all located on one side of the primary coil 110, and the plurality of secondary coils 130 are arranged along the axial direction of the core column 120. In the conventional coil structure, when the primary coil 110 is energized, each secondary coil 130 located on one side of the primary coil 110 can generate an induced voltage, so that the conventional coil structure can meet the requirement of providing multiple output voltages to the outside. However, since the multiple secondary coils 130 in the conventional coil structure are arranged along the axial direction of the core column 120, the distance between the two secondary coils 130 in the axial direction of the core column 120 is relatively large, which makes the leakage magnetic positions of the transformers corresponding to each secondary coil 130 different when the conventional coil structure is applied to the transformer, thereby causing the magnetic potential of each secondary coil 130 to be unequal, resulting in a large impedance deviation value between each secondary coil 130, which affects the power quality of the downstream electrical equipment connected to the secondary coil 130. The distance between the two secondary coils 130 refers to the distance from the head end of one secondary coil 130 to the head end of another secondary coil 130 in the axial direction of the core column 120.

[0036] Based on this, referring to FIG. 2 and FIG. 3 , an embodiment of the present application provides a coil structure 100, comprising a core column 120, a primary coil 110 and a plurality of secondary coils 130. The primary coil 110 is wound around the core column 120. Each secondary coil 130 comprises a plurality of coil segments 131 wound around the core column 120 and located on one side of the primary coil 110. The plurality of coil segments 131 in each secondary coil 130 are sequentially connected in series or in parallel with each other, and the respective coil segments 131 in the plurality of secondary coils 130 are sequentially alternately arranged along the axial direction of the core column 120.

[0037] In the coil structure 100, the primary coil 110 and the plurality of secondary coils 130 are wound around the core column 120, so that when current is passed through the primary coil 110, each secondary coil 130 can induce a voltage under the action of the magnetic field, thereby meeting the need to provide multiple output voltages to the outside. Each secondary coil 130 includes a plurality of coil segments 131, and each coil segment 131 in the plurality of secondary coils 130 is alternately arranged in sequence along the axial direction of the core column 120, so that two adjacent coil segments 131 belong to different secondary coils 130. Compared with the spacing between the secondary coils 130 and the secondary coils 130 in the traditional coil structure, the spacing between the coil segments 131 and the coil segments 131 in the coil structure 100 is smaller. Therefore, when the coil structure 100 is applied to the transformer 200, the leakage magnetic positions of the transformer 200 corresponding to the two adjacent coil segments 131 tend to be the same, thereby reducing the magnetic potential deviation between each coil segment 131. Therefore, when the multiple coil segments 131 in each secondary coil 130 are connected in series or in parallel, the magnetic potential of each secondary coil 130 is evenly distributed in the axial direction of the core column 120, thereby reducing the impedance deviation between each secondary coil 130 and achieving the effect of improving the downstream power quality.

[0038] It can be understood that the distance between two coil segments 131 refers to the distance from the head end of one coil segment 131 to the head end of the other coil segment 131 in the axial direction of the core column 120 .

[0039] Optionally, the number of secondary coils 130 can be designed as required, for example, two, three or more, preferably, the number of secondary coils 130 is three or five. The number of coil segments 131 in the secondary coil 130 can be designed as required, for example, two, three or more.

[0040] Optionally, the number of turns of each secondary coil 130 can be designed as needed. For example, in one embodiment, the number of turns of multiple secondary coils 130 is the same or different. In this way, when the material, size, number of turns and other parameters of each secondary coil 130 are the same, the voltage value output by each secondary coil 130 is the same; and when the material, size and other parameters of each secondary coil 130 are the same, but the number of turns is different, the voltage output by each secondary coil 130 is not equal. In other embodiments, only some of the secondary coils 130 may have the same number of turns.

[0041] In one embodiment, in each secondary coil 130 , the number of turns of each coil segment 131 is the same, so as to facilitate winding the secondary coil 130 on the core column 120 .

[0042] In one embodiment, the multiple coil segments 131 in each secondary coil 130 are evenly arranged along the axial direction of the core column 120. This helps to reduce the magnetic potential deviation between each secondary coil 130, reduce the impedance deviation between each secondary coil 130, and ensure the power quality of the downstream.

[0043] As shown in FIG. 4 , an embodiment of the present application further provides a transformer 200 , comprising the coil structure 100 in any of the above embodiments.

[0044] In the transformer 200, the primary coil 110 and the plurality of secondary coils 130 are wound around the core column 120, so that when current is passed through the primary coil 110, each secondary coil 130 can induce a voltage under the action of the magnetic field, thereby meeting the need to provide multiple output voltages to the outside. Each secondary coil 130 includes a plurality of coil segments 131, and each coil segment 131 in the plurality of secondary coils 130 is alternately arranged in sequence along the axial direction of the core column 120, so that two adjacent coil segments 131 belong to different secondary coils 130. Compared with the spacing between the secondary coils 130 and the secondary coils 130 in the traditional coil structure, the spacing between the coil segments 131 and the coil segments 131 in the coil structure 100 is smaller. Therefore, when the coil structure 100 is applied to the transformer 200, the leakage magnetic positions of the transformer 200 corresponding to the two adjacent coil segments 131 tend to be the same, thereby reducing the magnetic potential deviation between each coil segment 131. Therefore, when the multiple coil segments 131 in each secondary coil 130 are connected in series or in parallel, the magnetic potential of each secondary coil 130 is evenly distributed in the axial direction of the core column 120, thereby reducing the impedance deviation between each secondary coil 130 and achieving the effect of improving the downstream power quality.

[0045] Optionally, in one embodiment, the transformer 200 further includes a three-dimensional wound core 210, which includes three coil structures 100, which are arranged in a triangle, and the three coil structures 100 are used to respectively pass three currents of different phases. In this way, when three currents of different phases are passed through the three coil structures 100, the transformer 200 is a three-phase transformer, which enables the secondary coils 130 wound on different core columns 120 to induce voltages of different phases, so that the three coil structures 100 can output three voltages of different phases to the outside. Among them, the three coil structures 100 are arranged in a triangle, which means that the three coil structures 100 are arranged at intervals, and on the axial section perpendicular to the core column 120, the connection between the core columns 120 of the three coil structures 100 is a triangle, and the primary coils 110 and the secondary coils 130 wound on different core columns 120 can be respectively located at the three intersections of the triangle.

[0046] As shown in FIG4 , when the transformer includes a three-dimensional wound core, the transformer 200 is a vertical wound core transformer, so that the transformer 200 has obvious energy-saving and environmental protection advantages such as low no-load and load losses, low no-load current and low annual operating costs compared with the transformer 200 using a stacked core structure as the core structure, thereby effectively improving the performance of the transformer 200. Among them, in the vertical wound core transformer, the primary coil 110 can be wound around the outer periphery of the core column, and the secondary coil 130 can be wound around the core column 120 and located at the outer periphery of the primary coil 110.

[0047] Further, as shown in FIG. 4 , in one embodiment, the transformer 200 further includes three primary input terminals 250 and a plurality of secondary output terminals 220 , the three primary input terminals 250 and the three primary coils 110 are electrically connected one-to-one, and the plurality of secondary output terminals 220 are connected one-to-one with the plurality of secondary coils 130 . In this way, an external current can flow into the primary coil 110 through the primary input terminal 250 , so that the secondary coil 130 induces a voltage, and the secondary coil 130 can output the voltage to an external device through the secondary output terminal 220 . Among them, the three primary input terminals 250 can pass currents of different phases into the three primary coils 110 , so that the secondary coils 130 wound on different core columns 120 can induce voltages of different phases and output them through the secondary output terminals 220 connected thereto. Among them, the secondary output terminals 220 connected to the secondary coils 130 wound on the same core column 120 output voltages of the same phase.

[0048] In one embodiment, as shown in FIG4 , the transformer 200 further includes a clamp 230, which is connected to the core 120, and is used to fix the primary coil 110 and the plurality of secondary coils 130 to the core 120. In this way, the primary coil 110 and the plurality of secondary coils 130 can be reliably fixed on the core 120, so that when an external current flows into the primary coil 110, the secondary coil 130 can induce a corresponding voltage, thereby ensuring the reliability of the transformer 200.

[0049] Furthermore, in one embodiment, as shown in FIG4 , the clamp 230 further includes a first clamp 232 and a second clamp 231, the first clamp 232 and the second clamp 231 are respectively located at both ends of the core column 120, and are both connected to the core column 120, and the first clamp 232 and the second clamp 231 are used to jointly fix the primary coil 110 and the plurality of secondary coils 130. In this way, the primary coil 110 and the secondary coil 130 wound on the core column 120 can be stably arranged on the core column 120, thereby ensuring the reliability of the transformer 200.

[0050] Specifically, when the transformer is a three-dimensional wound core transformer, the first clamp 232 and the second clamp 231 can be respectively arranged at the two ends of the three core columns 120, and simultaneously connected to the three core columns 120, so that the first clamp 232 and the second clamp 231 can simultaneously press and fix the coils in the three coil structures 100, ensuring that each coil is fixed on the three-dimensional wound core 210. Three primary input terminals 250 and multiple secondary output terminals 220 can all be arranged on the first clamp 232, so as to facilitate the connection of external equipment with the input and output ends of the transformer 200.

[0051] Furthermore, in one embodiment, as shown in FIG4 , the transformer 200 further includes a mounting frame 240, which is connected to a side of the second clamp 230 away from the first clamp 250. In this way, the mounting frame 240 can support and fix the coil structure 100, so that the transformer 200 can be fixed at a desired position by the mounting frame 240, thereby improving the reliability and stability of the transformer 200.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A coil structure, It is characterized in that include: Core column, A primary coil, the primary coil is wound around the core column; A plurality of secondary coils, each of the secondary coils comprises a plurality of coil segments wound around the core column and located on one side of the primary coil, the plurality of coil segments in each secondary coil are sequentially connected in series or in parallel with each other, and the coil segments in the plurality of secondary coils are sequentially alternately arranged along the axial direction of the core column.

2. The coil structure according to claim 1, It is characterized in that The numbers of turns of the multiple secondary coils are the same or different.

3. The coil structure according to claim 1, It is characterized in that The plurality of coil segments in each of the secondary coils are arranged uniformly and spaced apart in an axial direction of the core column.

4. The coil structure according to claim 1, It is characterized in that The number of the secondary coils is three or five.

5. A transformer, It is characterized in that The invention comprises the coil structure as claimed in any one of claims 1 to 4.

6. The transformer according to claim 5, It is characterized in that The transformer comprises a three-dimensional wound core, and the three-dimensional wound core comprises three coil structures, and the three coil structures are arranged in a triangle, and the three coil structures are used to respectively pass currents of three different phases.

7. The transformer according to claim 6, It is characterized in that The transformer further includes three primary input terminals and a plurality of secondary output terminals. The three primary input terminals are electrically connected to the three primary coils in a one-to-one correspondence, and the plurality of secondary output terminals are electrically connected to the plurality of secondary coils in a one-to-one correspondence.

8. The transformer according to claim 5, It is characterized in that The transformer further includes a clamp connected to the core column, and the clamp is used to fix the primary coil and the plurality of secondary coils to the core column.

9. The transformer according to claim 8, It is characterized in that The clamp includes a first clamp and a second clamp, the first clamp and the second clamp are respectively located at two ends of the core column and are both connected to the core column, and the first clamp and the second clamp are used to jointly fix the primary coil and the multiple secondary coils.

10. The transformer according to claim 9, It is characterized in that The transformer further includes a mounting frame connected to a side of the second clamp facing away from the first clamp.

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