Current transformer

Abstract

The current transformer comprises a first magnetic core, a second magnetic core, a PCB layer and a bonding pad, the first magnetic core is provided with a groove, and a magnetic core column is arranged on the groove; the second magnetic core is buckled on the first magnetic core so as to form an accommodating space with the groove; one end of the PCB layer is arranged in the containing space, the other end of the PCB layer extends out of the containing space, the PCB layer comprises at least one layer of PCB, the PCB is provided with an installation through hole, and the magnetic core column is sleeved with the installation through hole. The two bonding pads are arranged at one end, extending out of the accommodating space, of the PCB layer. According to the scheme, the adaptability of the current transformer can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of current transformers, and in particular to a current transformer. Background Art

[0002] Current transformer is a measuring device widely used in power systems. It is mainly used to measure the size of AC current and convert high current into lower standard current output for subsequent measurement and protection control. Traditional current transformers mostly adopt a winding structure, mainly composed of an iron core, a skeleton, a primary terminal and a secondary winding. The primary terminal is usually connected to the skeleton through injection molding or other processes, and is connected in series to the circuit for measuring current, carrying a large current. The working principle of the current transformer is based on the principle of electromagnetic induction, and the current is sensed by the change of the magnetic flux of the iron core.

[0003] Once the design of a traditional current transformer is determined, the maximum current that the primary terminal can carry is fixed. When the current capacity of the primary side needs to be changed, the existing structure is usually not easy to adjust, and it is often necessary to redesign the mold or open a new mold, which increases production costs and limits the adaptability of the product. This makes the measurement range and flexibility of the current transformer relatively limited, and cannot meet the needs of different application scenarios. Summary of the invention

[0004] An embodiment of the present application provides a current transformer, which can improve the adaptability of the current transformer.

[0005] The present application provides a current transformer, including:

[0006] A first magnetic core, wherein the first magnetic core has a groove, and a magnetic core column is arranged on the groove;

[0007] a second magnetic core, the second magnetic core being buckled on the first magnetic core to form a receiving space with the groove;

[0008] A PCB layer, one end of which is disposed in the accommodation space and the other end of which extends out of the accommodation space, wherein the PCB layer comprises at least one PCB board, wherein the PCB board has a mounting through hole, and the mounting through hole is sleeved on the magnetic core column;

[0009] Solder pads, two of which are arranged at one end of the PCB layer extending out of the accommodation space.

[0010] In the current transformer provided in the embodiment of the present application, a winding structure is integrated in the PCB board, and the winding structure includes at least one first winding and at least one second winding.

[0011] In the current transformer provided in the embodiment of the present application, when the winding structure is a first winding and a second winding, the first winding is arranged around the mounting through hole, and the second winding is arranged around the first winding.

[0012] In the current transformer provided in the embodiment of the present application, when the winding structure includes at least two first windings, the first windings and the second windings are alternately arranged.

[0013] In the current transformer provided in the embodiment of the present application, the first winding and the second winding are arranged in parallel.

[0014] In the current transformer provided in the embodiment of the present application, when the PCB board includes at least two layers of PCB boards, the PCB boards are arranged in parallel.

[0015] In the current transformer provided in the embodiment of the present application, the first windings on two adjacent layers of the PCB boards are arranged in parallel.

[0016] In the current transformer provided in the embodiment of the present application, the second windings on two adjacent layers of the PCB boards are arranged in parallel.

[0017] In the current transformer provided in the embodiment of the present application, the two ends of the second winding are respectively connected to the two pads.

[0018] In the current transformer provided in the embodiment of the present application, one end of the first winding is connected to one of the pads, and the other end is grounded.

[0019] In summary, the current transformer provided in the embodiment of the present application includes a first magnetic core, a second magnetic core, a PCB layer and a soldering pad, wherein the first magnetic core has a groove, and a magnetic core column is arranged on the groove; the second magnetic core is buckled on the first magnetic core to form a accommodating space with the groove; one end of the PCB layer is arranged in the accommodating space, and the other end extends out of the accommodating space, and the PCB layer includes at least one layer of PCB board, and the PCB board has a mounting through hole, and the mounting through hole is sleeved on the magnetic core column. The two soldering pads are arranged at one end of the PCB layer extending out of the accommodating space. This solution can adjust the current carrying capacity of the current transformer by adjusting the number of layers of PCB boards in the PCB layer, thereby improving the adaptability of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the current transformer provided in an embodiment of the present application.

[0022] Figure 2 It is a schematic diagram of the assembly structure of a PCB board and a pad provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items.

[0025] It should be understood that when an element or layer is referred to as being "on, "adjacent to, "connected to, or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, "directly adjacent to, "directly connected to, or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion, and are not to be understood as indicating or implying relative importance.

[0026] Spatial relationship terms such as "under", "below", "below", "under", "above", "above", "above", "below", "upper", "lower", "upper", "lower", "inside", "outside", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly. In addition, terms such as "first", "second", etc. are used for descriptive purposes only and cannot be understood to indicate or imply relative importance.

[0027] Once the design of a traditional current transformer is determined, the maximum current that the primary terminal can carry is fixed. When the current capacity of the primary side needs to be changed, the existing structure is usually not easy to adjust, and it is often necessary to redesign the mold or open a new mold, which increases production costs and limits the adaptability of the product. This makes the measurement range and flexibility of the current transformer relatively limited, and cannot meet the needs of different application scenarios.

[0028] Based on this, the embodiment of the present application provides a current transformer. The technical solution shown in the present application will be described in detail below through specific embodiments. It should be noted that the description order of the following embodiments is not intended to limit the priority order of the embodiments.

[0029] See also Figure 1-Figure 2 The current transformer may include a first magnetic core 10 , a second magnetic core 20 , a PCB layer 30 and a pad 40 .

[0030] The first magnetic core 10 has a groove 11, and a magnetic core column 12 is arranged on the groove 11. The second magnetic core 20 is buckled on the first magnetic core 10 to form a receiving space with the groove 11. One end of the PCB layer 30 is arranged in the receiving space, and the other end extends out of the receiving space. The PCB layer 30 includes at least one PCB board 31, and the PCB board 31 has a mounting through hole 311, and the mounting through hole 311 is sleeved on the magnetic core column 12; two pads 40 are arranged at one end of the PCB layer 30 extending out of the receiving space.

[0031] It should be noted that the preferred materials of the first magnetic core 10 and the second magnetic core 20 should have high magnetic permeability and low hysteresis loss to ensure that the current transformer can maintain good linearity and sensitivity under various working conditions. In addition, the first magnetic core 10 and the second magnetic core 20 can be mechanically fastened or bonded to facilitate the disassembly and assembly of the first magnetic core 10 and the second magnetic core 20, thereby facilitating the adjustment of the number of layers of the PCB board 31 in the PCB layer 30, and further facilitating the adjustment of the current transformer's current carrying capacity and improving the adaptability of the current transformer.

[0032] In addition, the design of the first magnetic core 10 and the second magnetic core 20 enables the magnetic field to be efficiently distributed inside the transformer, providing a larger magnetic flux density. The structure of the groove 11 and the magnetic core column 12 helps to better guide the magnetic field and enhance the inductive performance of the current transformer. The accommodation space formed by the groove 11 and the magnetic core column 12 provides a stable installation platform for the PCB layer 30, ensures the physical stability of the component, and helps to improve the reliability of the current transformer.

[0033] The PCB board 31 is integrated with a winding structure, which may include at least one first winding 312 and at least one second winding 313. Since the winding of the current transformer is replaced by the PCB winding, it has a more accurate design of line width, line spacing and interlayer distance, optimizes current distribution, reduces eddy current loss, has better measurement accuracy, and is easier to produce.

[0034] The two ends of the second winding 313 are respectively connected to two pads 40, which can effectively solve the stray parameters around the PCB layer 30 and reduce the EMI of the product. One end of the first winding 312 is connected to a pad 40, and the other end is grounded.

[0035] In some embodiments, when the winding structure is a first winding 312 and a second winding 313, the first winding 312 is disposed around the mounting through hole 311, and the second winding 313 is disposed around the first winding 312. The second winding 313 may be conventionally spirally wound.

[0036] By integrating a first winding 312 and a second winding 313 on the PCB board 31, the sensing capability and accuracy of the current transformer can be improved, and the measurement sensitivity can be enhanced. Electromagnetic interference can be better suppressed, and electromagnetic compatibility can be improved, especially in a high-frequency environment.

[0037] In another embodiment, when the winding structure includes at least two first windings 312, the first windings 312 and the second windings 313 are alternately arranged. The alternately arranged first windings 312 and second windings 313 can effectively balance the magnetic field distribution, improve the induction efficiency of the current transformer, and help reduce mutual interference between the windings, further improving the measurement accuracy and linearity of the current transformer.

[0038] The first winding 312 and the second winding 313 are arranged in parallel. In the specific implementation process, the first winding 312 and the second winding 313 can be connected in parallel through terminals or through holes. The parallel arrangement can increase the current carrying capacity of the current transformer, so that it can handle a larger current load, thereby improving adaptability and meeting the needs of different application scenarios. In addition, it can also share the load, reduce the current density of the winding, and reduce the risk of overheating, thereby improving the reliability and service life of the current transformer.

[0039] It should be noted that when the PCB board 31 includes at least two layers of PCB boards 31, the PCB boards 31 are arranged in parallel. The parallel arrangement of multiple layers of PCB boards 31 can effectively increase the current handling capacity of the current transformer and meet the detection requirements of larger currents. By using the design of multiple layers of PCB boards 31, a higher current handling capacity can be achieved in a limited space, making the device more compact and adaptable to application scenarios with limited space.

[0040] Specifically, the first windings 312 on two adjacent layers of PCB boards 31 are arranged in parallel. The second windings 313 on two adjacent layers of PCB boards 31 are arranged in parallel. Through the parallel design of adjacent layers of windings, the current sensing capability and linearity of the current transformer are further improved, which can improve the transmission efficiency of the signal, reduce signal attenuation, and help improve the measurement accuracy and system stability.

[0041] In summary, the current transformer provided in the embodiment of the present application includes a first magnetic core 10, a second magnetic core 20, a PCB layer 30 and a soldering pad 40, wherein the first magnetic core 10 has a groove 11, and a magnetic core column 12 is arranged on the groove 11; the second magnetic core 20 is buckled on the first magnetic core 10 to form a receiving space with the groove 11; one end of the PCB layer 30 is arranged in the receiving space, and the other end extends out of the receiving space, and the PCB layer 30 includes at least one layer of PCB board 31, and the PCB board 31 has a mounting through hole 311, and the mounting through hole 311 is sleeved on the magnetic core column 12. Two soldering pads 40 are arranged at one end of the PCB layer 30 extending out of the receiving space. This solution can adjust the current carrying capacity of the current transformer by adjusting the number of layers of the PCB board 31 in the PCB layer 30, thereby improving the adaptability of the current transformer. Furthermore, since the current transformer eliminates the skeleton and integrates the windings and terminals on the PCB board 31, it can be directly assembled into the test circuit in a plug-in manner. It has a simple structure and has the advantages of small size, low weight, simple structure, simple process and low cost.

[0042] The current transformer provided in the present application is introduced in detail above. The principles and implementation methods of the present application are explained by using specific examples in the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application. At the same time, for technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A current transformer, characterized in that: include A first magnetic core, wherein the first magnetic core has a groove, and a magnetic core column is arranged on the groove; a second magnetic core, the second magnetic core being buckled on the first magnetic core to form a receiving space with the groove; A PCB layer, one end of which is disposed in the accommodation space and the other end of which extends out of the accommodation space, wherein the PCB layer comprises at least one PCB board, wherein the PCB board has a mounting through hole, and the mounting through hole is sleeved on the magnetic core column; Solder pads, two of the solder pads are arranged at one end of the PCB layer extending out of the accommodation space.

2. The current transformer according to claim 1, characterized in that: A winding structure is integrated in the PCB board, and the winding structure includes at least one first winding and at least one second winding.

3. The current transformer according to claim 2, characterized in that: When the winding structure includes one first winding and one second winding, the first winding is arranged around the mounting through hole, and the second winding is arranged around the first winding.

4. The current transformer according to claim 2, characterized in that: When the winding structure includes at least two first windings, the first windings and the second windings are alternately arranged.

5. The current transformer according to claim 2, characterized in that: The first winding and the second winding are arranged in parallel.

6. The current transformer according to claim 2, characterized in that: When the PCB board includes at least two layers of PCB boards, the PCB boards are arranged in parallel.

7. The current transformer according to claim 6, characterized in that: The first windings on two adjacent layers of the PCB boards are arranged in parallel.

8. The current transformer according to claim 6, characterized in that: The second windings on two adjacent layers of the PCB boards are arranged in parallel.

9. The current transformer according to claim 2, characterized in that: Two ends of the second winding are connected to the two pads respectively.

10. The current transformer according to claim 2, characterized in that: One end of the first winding is connected to one of the pads, and the other end is grounded.

Images