Magnetic core assembly, miniature current transformer and processing method of miniature current transformer

Abstract

The invention relates to the technical field of current detection, and particularly discloses a magnetic core assembly, a miniature current transformer and a processing method thereof.The magnetic core assembly comprises a first magnetic core and a second magnetic core, the first magnetic core comprises a first base, a first mounting column and a first connecting plate, and the first mounting column and the first connecting plate are arranged on the first base; the first connecting plate is arranged on one side of the first mounting column. The second magnetic core comprises a second base, a second mounting column and a second connecting plate, the second mounting column and the second connecting plate are arranged on the second base, the second connecting plate is arranged on one side of the second mounting column, the second connecting plate is correspondingly connected with the first connecting plate, and the second mounting column is correspondingly connected with the first mounting column; the conductive part can be wound on the first mounting column and the second mounting column, the first connecting plate and the second connecting plate perform protection on one side of the conductive part, efficient heat dissipation can be performed on the circumferential surface of the guide part, and the overall size of the magnetic core assembly and the miniature current transformer can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of current detection, and in particular to a magnetic core component, a miniature current transformer and a processing method thereof. Background Art

[0002] A current transformer is a device used in power systems to measure electronic circuits and protect power systems. Its main function is to convert high current into low current to facilitate the use of measurement and protection equipment.

[0003] In the related art, the current transformer includes a magnetic core, a primary winding and a secondary winding. The magnetic core mostly adopts a "sun" shaped structure. The magnetic core includes a panel, a bottom column, a middle column and a side column. The primary winding and the secondary winding are wound around the circumference of the middle column and are wound between the middle column and the bottom column and between the middle column and the side column. To facilitate the winding of the primary winding and the secondary winding, sufficient winding spacing needs to be reserved between the bottom column, the middle column and the side column, so that the magnetic core needs to be designed to be large in volume, and the panel, the bottom column and the side column are arranged around the circumference of the primary winding and the secondary winding. The panel, the bottom column and the side column will also have a certain temperature under the action of magnetic induction. The heat of the primary winding and the secondary winding is not easy to dissipate. Under high voltage conditions, high temperature is easily formed. If the primary winding and the secondary winding are damaged due to high temperature or collision, a short circuit will be formed, causing a safety accident. Summary of the invention

[0004] The object of the present invention is to provide a magnetic core component, a miniature current transformer and a processing method thereof, so as to solve the problems of large volume and low heat dissipation capacity of the current transformer in the related art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a magnetic core component, the magnetic core component comprising:

[0007] A first magnetic core, comprising a first base, a first mounting post and a first connecting plate, wherein the first mounting post and the first connecting plate are arranged on the first base, and the first connecting plate is arranged on one side of the first mounting post;

[0008] The second magnetic core includes a second base, a second mounting column and a second connecting plate, wherein the second mounting column and the second connecting plate are arranged on the second base, the second connecting plate is arranged on one side of the second mounting column, the second connecting plate is correspondingly connected to the first connecting plate, and the second mounting column is correspondingly connected to the first mounting column.

[0009] In one embodiment, a first receiving groove is provided on a surface of the first connecting plate facing the first mounting column, the first receiving groove is an arc-shaped groove, and the first receiving groove is coaxially arranged with the first mounting column; and / or,

[0010] A second accommodating groove is arranged on the surface of the second connecting plate facing the second mounting column, the second accommodating groove is an arc-shaped groove, and the second accommodating groove is coaxially arranged with the second mounting column.

[0011] In one embodiment, the first mounting column and the first connecting plate are both extended along a first direction, and an extension length of the first mounting column is the same as an extension length of the first connecting plate; and / or,

[0012] The second mounting post and the second connecting plate are both extended along the first direction, and the extension length of the second mounting post is the same as the extension length of the second connecting plate.

[0013] In a second aspect, the present invention provides a miniature current transformer, the miniature current transformer comprising:

[0014] The magnetic core assembly of any of the above solutions;

[0015] A frame, wherein a mounting hole is provided in the frame, the mounting hole is extended along a first direction, a wire winding groove is provided on the frame, the wire winding groove is arranged along the circumference of the mounting hole, and the frame is arranged on the first mounting column and the second mounting column through the mounting hole;

[0016] A primary side winding is arranged in the frame, and the primary side winding is arranged along the circumference of the mounting hole, and the primary side winding has a first power connection structure;

[0017] The secondary winding is arranged in the winding groove and along the circumference of the mounting hole. The secondary winding has a second power connection structure, which is arranged on the frame. The second power connection structure and the first power connection structure are respectively arranged on both sides of the winding groove.

[0018] In one embodiment, the primary side winding includes an annular sheet, and the annular sheet is provided with a break to form a first end and a second end;

[0019] The first power connection structure includes two lead-out pieces, one of which is arranged at the first end of the annular piece, and the other of which is arranged at the second end of the annular piece, and both of which are extended to the outside of the frame.

[0020] In one of the embodiments, the secondary winding comprises a coil, and the coil is disposed in the winding slot;

[0021] The second power connection structure includes two pins, one of which is electrically connected to one end of the coil, and the other pin is electrically connected to the other end of the coil, and the two pins are fixedly arranged on the frame.

[0022] In one of the embodiments, a tin-immersion soldering structure is provided between the coil and the pin, an end of the coil is wound around the pin, and the end of the coil is fixedly connected to the pin through the tin-immersion soldering structure.

[0023] In one embodiment, the secondary winding further comprises an insulating member, wherein the insulating member is arranged along the circumference of the coil, and the insulating member covers the entire circumferential side wall of the coil; and / or,

[0024] An adhesive structure is provided between the first connecting plate and / or the second connecting plate and the secondary winding, and the first connecting plate and / or the second connecting plate are fixedly connected to the surface of the secondary winding via the adhesive structure.

[0025] In one embodiment, a first supporting structure is disposed on the frame, the first supporting structure is disposed between the first base and the second base, and the first supporting structure is capable of supporting the first connecting plate and / or the second connecting plate; and / or,

[0026] The frame is provided with a second supporting structure, and the second supporting structure can support the first base and / or the second base.

[0027] In a third aspect, the present invention provides a method for processing a miniature current transformer. Based on the miniature current transformer in any of the above schemes, the method for processing the miniature current transformer includes:

[0028] Obtaining primary side winding, secondary side winding, bobbin and magnetic core assembly;

[0029] The primary side winding is pre-buried in the frame, and the first power connection structure of the primary side winding is led out to the outside of the frame;

[0030] Winding the secondary winding on the frame, and fixing the second power connection structure of the secondary winding on the frame;

[0031] The skeleton is installed on the first magnetic core and the second magnetic core, and the first magnetic core, the second magnetic core and the secondary side winding are fixed.

[0032] The beneficial effects of the present invention are:

[0033] The present invention provides a magnetic core component, a miniature current transformer and a processing method thereof. The first mounting post and the second mounting post of the magnetic core component can be used for mounting conductive parts such as a secondary side winding. The first connecting plate and the second connecting plate are only arranged on one side of the first mounting post and the second mounting post, thereby reducing the lateral and overall occupied space of the magnetic core component, effectively reducing the volume of the magnetic core component, reducing the magnet enclosed space of the magnetic core component, and other circumferential surfaces of the conductive parts can all be used for efficient heat dissipation.

[0034] The miniature current transformer has a skeleton installed on the first mounting column and the second mounting column of the magnetic core assembly, the primary winding is arranged in the skeleton, and the secondary winding is wound in the winding groove on the skeleton. The skeleton can provide sufficient layout space for the primary winding and the secondary winding, and the skeleton can wrap the primary winding for insulation protection. The first power connection structure and the second power connection structure are arranged on both sides of the winding groove of the skeleton, with a large layout spacing, which can effectively ensure the insulation of the primary winding and the secondary winding in a small space. And by using the structure of the magnetic core assembly, the miniature current transformer has a small volume and efficient heat dissipation.

[0035] The processing method of the micro current transformer is to embed the primary side winding in the skeleton, position the primary side winding and the skeleton, reduce the winding steps of the primary side winding during assembly, and also reduce the volume of the micro current transformer. Then the secondary side winding is wound on the skeleton, so that the winding path and the winding position of the secondary side winding are selected and adjusted based on the position of the primary side winding, so as to ensure that there is sufficient insulation strength and coupling efficiency between the primary side winding and the secondary side winding. Then the skeleton and the secondary side winding are integrally installed on the first magnetic core and the second magnetic core, and the micro current transformer is integrally fixed by fixing the first magnetic core, the second magnetic core and the secondary side winding, so as to avoid mutual displacement between the first magnetic core, the second magnetic core and the secondary side winding, thereby ensuring the uniformity and coupling efficiency of the magnetic flux, so that the magnetic flux distribution meets the needs of current mutual inductance, ensures the measurement accuracy of the micro current transformer, and reduces the error. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of a first magnetic core in an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the connection structure of the first magnetic core and the second magnetic core in an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the overall structure of a miniature current transformer in an embodiment of the present invention;

[0039] Figure 4 It is a front view of a miniature current transformer in an embodiment of the present invention;

[0040] Figure 5 is a cross-sectional view of a miniature current transformer in an embodiment of the present invention;

[0041] Figure 6 Schematic diagram of the structure of the primary side winding in an embodiment of the present invention;

[0042] Figure 7 Schematic diagram of the connection structure between the skeleton and the secondary winding in an embodiment of the present invention;

[0043] Figure 8 A schematic diagram of the arrangement positions of the first power connection structure and the second power connection structure on the frame in an embodiment of the present invention;

[0044] Fig. 9 Schematic diagram of a processing method for a miniature current transformer in an embodiment of the present invention.

[0045] In the figure:

[0046] 1. Magnetic core assembly;

[0047] 11. first magnetic core; 111. first base; 112. first mounting column; 113. first connecting plate; 114. first receiving groove;

[0048] 12. second magnetic core; 121. second base; 122. second mounting column; 123. second connecting plate; 124. second receiving groove;

[0049] 2. Frame; 21. Mounting hole; 22. Winding groove; 23. First supporting structure; 24. Second supporting structure;

[0050] 3. primary side winding; 31. first power connection structure; 311. lead-out plate; 32. annular plate;

[0051] 4. secondary side winding; 41. second power connection structure; 411. pin; 42. coil; 43. insulating member;

[0052] 5. Bonding structure. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0054] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0056] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0057] like Figure 1 to Figure 2 As shown, the X direction in the figure is a schematic diagram of the first direction. An embodiment of the first aspect of the present invention provides a magnetic core assembly, which includes a first magnetic core 11 and a second magnetic core 12 connected to each other, the first magnetic core 11 includes a first base 111, a first mounting post 112 and a first connecting plate 113, the first mounting post 112 and the first connecting plate 113 are arranged on the first base 111, and the first connecting plate 113 is arranged on one side of the first mounting post 112.

[0058] The second magnetic core 12 includes a second base 121, a second mounting column 122 and a second connecting plate 123. The second mounting column 122 and the second connecting plate 123 are arranged on the second base 121. The second connecting plate 123 is arranged on one side of the second mounting column 122. The second connecting plate 123 is correspondingly connected to the first connecting plate 113, and the second mounting column 122 is correspondingly connected to the first mounting column 112.

[0059] With such arrangement, this embodiment can form a complete rod with closed ends through the corresponding connection between the first mounting column 112 and the second connecting column, so that the secondary side winding 4 and other conductive parts can be mounted thereon, and the first connecting plate 113 and the second connecting plate 123 are only arranged on one side of the first mounting column 112 and the second mounting column 122, which can protect the secondary side winding 4 and other conductive parts, and reduce the rotational torque at the connection between the first mounting column 112 and the second mounting column 122, thereby reducing the lateral and overall occupied space of the magnetic core assembly 1, effectively reducing the volume of the magnetic core assembly 1, and reducing the magnet enclosed space of the magnetic core assembly 1.

[0060] Moreover, when the secondary side winding 4 and other conductive parts are mounted on the first mounting column 112 and the second mounting column 122, the first connecting plate 113 and the second connecting plate 123 are only protected on one side of the conductive part, and other circumferential surfaces of the conductive part can efficiently dissipate heat. The magnetic core assembly 1 of this embodiment can reduce the heat dissipation barriers to the conductive parts, improve the heat dissipation capacity of the conductive parts and the current transformer as a whole, and solve the problem of large size and low heat dissipation capacity of the current transformer in the related technology.

[0061] In this embodiment, the cross-sectional shape of the first mounting column 112 and the second mounting column 122 can be, but not limited to, circular or polygonal, and the cross-sectional shape can be selected according to actual needs. The first connecting plate 113 and the second connecting plate 123 are plates with a certain width, and the width of the first connecting plate 113 can be equal to or greater than the radial dimension of the first mounting column 112, and the width of the second connecting plate 123 can be equal to or greater than the radial dimension of the second mounting column 122, so as to form a good protective effect on the conductive member.

[0062] like Figure 1 to Figure 2 As shown, in some embodiments, a first accommodating groove 114 is provided on the surface of the first connecting plate 113 facing the first mounting column 112, and the first accommodating groove 114 is an arc-shaped groove. The first accommodating groove 114 is coaxially arranged with the first mounting column 112, that is, when the secondary side winding 4 and other conductive parts are wound on the first mounting column 112, the first accommodating groove 114 can provide a certain accommodating space for the side of the secondary side winding 4 and other conductive parts, thereby reducing the distance between the first connecting plate 113 and the first mounting column 112, reducing the overall height of the magnetic core assembly 1, and further reducing the overall volume of the magnetic core assembly 1.

[0063] In this embodiment, the cross-sectional shape of the first accommodating groove 114 can be similar to the cross-sectional shape of the first mounting column 112, so that the groove wall of the first accommodating groove 114 and the side surface of the first mounting column 112 can be arranged at equal intervals, which facilitates the circumferential winding of conductive parts such as the secondary side winding 4 along the first mounting column 112.

[0064] like Figure 1 to Figure 2As shown, in some embodiments, a second accommodating groove 124 is provided on the surface of the second connecting plate 123 facing the second mounting column 122, and the second accommodating groove 124 is an arc-shaped groove. The second accommodating groove 124 is coaxially arranged with the second mounting column 122. Similarly, when the secondary side winding 4 and other conductive parts are wound on the second mounting column 122, the second accommodating groove 124 can provide a certain accommodating space for the side of the secondary side winding 4 and other conductive parts, thereby reducing the distance between the second connecting plate 123 and the second mounting column 122, reducing the overall height of the magnetic core assembly 1, and further reducing the overall volume of the magnetic core assembly 1.

[0065] In this embodiment, the first receiving groove 114 and the second receiving groove 124 can be set selectively or together, and can be set according to the installation requirements of the conductive parts such as the secondary side winding 4. The cross-sectional shape of the second receiving groove 124 can be similar to the cross-sectional shape of the second mounting column 122, so that the groove wall of the second receiving groove 124 and the side surface of the second mounting column 122 can be arranged at equal intervals, which facilitates the secondary side winding 4 and other conductive parts to be wound around the circumference of the second mounting column 122. Optionally, the first direction can be selected as the axial direction of the first mounting column 112 and the second mounting column 122.

[0066] like Figure 1 to Figure 2 As shown, in some embodiments, the first mounting column 112 and the first connecting plate 113 are both extended along the first direction, that is, the first mounting column 112 and the first connecting plate 113 are extended in the same direction, which is convenient for the sleeve installation of conductive parts such as the secondary winding 4. The extension length of the first mounting column 112 is the same as the extension length of the first connecting plate 113, so that the first magnetic core 11 can be processed into a standard part, reducing the size difference between the first mounting column 112 and the first connecting plate 113, and the connection position is located in the same plane, which is convenient for connection operation.

[0067] like Figure 1 to Figure 2 As shown, in some embodiments, the second mounting post 122 and the second connecting plate 123 are both extended along the first direction, and the second mounting post 122 and the second connecting plate 123 are extended in the same direction, which is convenient for the sleeve installation of conductive parts such as the secondary winding 4. The extension length of the second mounting post 122 is the same as the extension length of the second connecting plate 123. Similarly, it is convenient for the second magnetic core 12 to be processed into a standard part, reducing the size difference between the second mounting post 122 and the second connecting plate 123. The connection position is located in the same plane, and the connection operation is convenient, which is convenient for the first mounting post 112 to be connected with the second mounting post 122 and the first connecting plate 113 to be connected with the second connecting plate 123.

[0068] like Figures 3 to 5 As shown, an embodiment of the second aspect of the present invention provides a miniature current transformer, which includes a skeleton 2, a primary winding 3, a secondary winding 4 and a magnetic core assembly 1 in any of the above schemes.

[0069] The skeleton 2 is provided with a mounting hole 21, which is extended in the first direction. The skeleton 2 is provided with a winding groove 22, which is arranged along the circumference of the mounting hole 21. The skeleton 2 is arranged on the first mounting column 112 and the second mounting column 122 through the mounting hole 21, that is, the skeleton 2 is sleeved on the outer wall of the first mounting column 112 and the second mounting column 122, so as to form radial positioning of the skeleton 2 and the first magnetic core 11 and the second magnetic core 12. The primary side winding 3 is arranged in the skeleton 2, and the primary side winding 3 is arranged along the circumference of the mounting hole 21, so that the primary side winding 3 can be wound around the circumference of the first mounting column 112 and the second mounting column 122 of the magnetic core assembly 1. The primary side winding 3 has a first power connection structure 31, and the first power connection structure 31 can be connected to the circuit under test.

[0070] The secondary winding 4 is arranged in the winding groove 22, and the secondary winding 4 is arranged along the circumference of the mounting hole 21. The secondary winding 4 has a second power connection structure 41, and the second power connection structure 41 is arranged on the skeleton 2, and the second power connection structure 41 and the first power connection structure 31 are respectively arranged on both sides of the winding groove 22, and the second power connection structure 41 can be electrically connected to the circuit where the measuring instrument is located, and is supported by the skeleton 2, and the skeleton 2 can provide sufficient layout space for the primary winding 3 and the secondary winding 4, and the skeleton 2 is an insulating material, the primary winding 3 can be pre-buried in the skeleton 2, and the skeleton 2 can wrap the primary winding 3 for insulation protection, and the first power connection structure 31 and the second power connection structure 41 are respectively arranged on both sides of the winding groove 22 of the skeleton 2, and have a large layout spacing, which can effectively ensure the insulation of the primary winding 3 and the secondary winding 4 in a small space.

[0071] The first connecting plate 113 and the second connecting plate 123 of the magnetic core assembly 1 are only provided on one side of the first mounting column 112 and the second mounting column 122, which can protect the secondary winding 4 and reduce the rotational torque at the connection between the first mounting column 112 and the second mounting column 122, thereby reducing the lateral and overall occupied space of the magnetic core assembly 1, effectively reducing the volume of the magnetic core assembly 1, and reducing the magnet enclosed space of the magnetic core assembly 1. Moreover, when the secondary winding 4 is sleeved on the first mounting column 112 and the second mounting column 122, the first connecting plate 113 and the second connecting plate 123 are only provided on one side of the secondary winding 4, and other circumferential surfaces of the secondary winding 4 can be efficiently heat-dissipated. The magnetic core assembly 1 can reduce the heat dissipation barrier for the secondary winding 4 and improve the heat dissipation capacity of the secondary winding 4 and the current transformer as a whole.

[0072] In this embodiment, the first power connection structure 31 can be arranged outside the frame 2 to facilitate connection with structures such as a circuit board. Of course, the first power connection structure 31 can also be arranged inside the frame 2, and the electrical connection end of the external circuit under test can be inserted into the frame 2 to be electrically connected to the first power connection structure 31.

[0073] like Figures 4 to 6 As shown, in some embodiments, the primary side winding 3 includes an annular sheet 32, and the annular sheet 32 ​​is provided with a break to form a first end and a second end. The first power connection structure 31 includes two lead-out sheets 311, one lead-out sheet 311 is arranged at the first end of the annular sheet 32, and the other lead-out sheet 311 is arranged at the second end of the annular sheet 32, and both lead-out sheets 311 are passed out to the outside of the skeleton 2 to form the first power connection structure 31, and the annular sheet 32 ​​and part of the lead-out sheets 311 can be pre-buried inside the skeleton 2, which can not only be insulated by wrapping with the skeleton 2, but also improve the position accuracy of the annular sheet 32 ​​by using the skeleton 2, and the primary side winding 3 is designed as an annular sheet 32, which can reduce the nonlinear influence of the magnetic circuit, thereby improving the measurement accuracy of the current transformer.

[0074] In this embodiment, the annular sheet 32 ​​and the lead-out sheet 311 are integrally formed, and the joint between the annular sheet 32 ​​and the lead-out sheet 311 can be an inclined surface or a smooth curved surface transition to reduce stress concentration. A pre-buried hole is provided in the frame 2, and the pre-buried hole is used to accommodate the annular sheet 32. One or more through holes can be provided on the frame 2, and the through holes are connected to the pre-buried holes to facilitate determination of the position state of the annular sheet 32.

[0075] like Figures 3 to 5 as well as Figure 7 As shown, in some embodiments, the secondary side winding 4 includes a coil 42, and the coil 42 is arranged in the winding groove 22. The second power connection structure 41 includes two pins 411, one pin 411 is electrically connected to one end of the coil 42, and the other pin 411 is electrically connected to the other end of the coil 42. The two pins 411 are fixedly arranged on the skeleton 2 to form the second power connection structure 41, that is, the coil 42 is wound in the winding groove 22 of the skeleton 2, and the two pins 411 are fixed on the skeleton 2. The coil 42 and the pins 411 can be supported by the skeleton 2, and the position is stable, which also facilitates the accurate connection of the pins 411 with the circuit where the measuring instrument is located.

[0076] In this embodiment, the end of the coil 42 can be inserted into the skeleton 2 and electrically connected to the pin 411, and the skeleton 2 can support and protect the electrical connection position between the coil 42 and the pin 411. Alternatively, the coil 42 can also be wound around the pin 411 and electrically connected to the pin 411, and the end of the coil 42 can be directly set up through the pin 411, both of which can achieve electrical connection between the pin 411 and the coil 42, and can be selected according to the needs of use. The pin 411 and the lead-out sheet 311 can both be set at the bottom of the skeleton 2, and the positions of the two are unified, which is convenient for reducing the occupation of the lateral space of the skeleton 2 by the two, and reducing the overall volume of the miniature current transformer.

[0077] like Figures 3 to 5 as well as Figure 8As shown, in some embodiments, a tin-immersion soldering structure is provided between the coil 42 and the pin 411, the end of the coil 42 is wound around the pin 411, and the end of the coil 42 is fixedly connected to the pin 411 through the tin-immersion soldering structure. The tin-immersion soldering structure can make the connection between the coil 42 and the pin 411 have higher connection reliability, reduce undesirable phenomena such as false welding or cold welding, reduce the welding defect rate, and has little heat influence and is easy to process, thereby reducing the damage to other miniature components in the miniature current transformer caused by the connection processing between the coil 42 and the pin 411.

[0078] like Figures 3 to 5 as well as Figure 7 As shown, in some embodiments, the secondary side winding 4 also includes an insulating member 43, which is arranged along the circumference of the coil 42, and the insulating member 43 covers the entire circumferential side wall of the coil 42, so as to facilitate the insulation protection of the insulation structure of the coil 42 itself, and further insulation protection is provided between the coil 42 and the first connecting plate 113 and the second connecting plate 123 of the magnetic core component 1, thereby reducing the possibility of damage to the coil 42 and contact with the magnetic core component 1.

[0079] In this embodiment, the insulating member 43 is made of insulating material, such as plastic or rubber. The insulating member 43 can be a flexible sheet structure or a plate structure, and can be arranged around the circumference of the coil 42 to wrap. The surface of the insulating member 43 can be spaced apart from the first connecting plate 113 and the second connecting plate 123, or can be fitted to each other.

[0080] like Figures 3 to 5 as well as Figure 7 As shown, in some embodiments, an adhesive structure 5 is provided between the first connecting plate 113 and / or the second connecting plate 123 and the secondary side winding 4, and the first connecting plate 113 and / or the second connecting plate 123 are fixedly connected to the surface of the secondary side winding 4 through the adhesive structure 5, so as to facilitate the connection and fixation between the first connecting plate 113, the second connecting plate 123 and the secondary side winding 4, thereby reducing the modification or damage to the surface of the first connecting plate 113, the second connecting plate 123 and the secondary side winding 4.

[0081] In this embodiment, the bonding structure 5 can be but not limited to glue or film, and the material of the bonding structure 5 can be epoxy glue, which has strong bonding force and small shrinkage. The first connecting plate 113 and the second connecting plate 123 can be bonded to the secondary winding 4 through the bonding structure 5, or after the first connecting plate 113 and the second connecting plate 123 are connected, one of them can be bonded and fixed to the secondary winding 4.

[0082] like Figures 3 to 5As shown, in some embodiments, a first supporting structure 23 is provided on the skeleton 2, and the first supporting structure 23 is provided between the first base 111 and the second base 121, and the first supporting structure 23 can support the first connecting plate 113 or the second connecting plate 123. The first supporting structure 23 can be a plate-shaped or block-shaped structure, and can be built in a groove cavity surrounded by the first base 111 and the second base 121 and the first connecting plate 113 and the second connecting plate 123. After the main body of the skeleton 2 is sleeved on the first mounting column 112 and the second mounting column 122, the first supporting structure 23 can fit with the first base 111 or the second base 121 or reserve a certain distance to avoid excessive axial movement of the first magnetic core 11 or the second magnetic core 12 relative to the skeleton 2, and the top of the first supporting structure 23 can support the first connecting plate 113 or the second connecting plate 123, which can reduce the circumferential excessive shaking of the first magnetic core 11 and the second magnetic core 12.

[0083] Among them, one or two first supporting structures 23 can be provided. When two first supporting structures 23 are provided, the two first supporting structures 23 can be separately arranged on both sides of the winding groove 22, and are respectively arranged at the two end positions of the skeleton 2 to support the first connecting plate 113 and the second connecting plate 123 respectively.

[0084] like Figures 3 to 5 As shown, in some embodiments, a second supporting structure 24 is provided on the skeleton 2, and the second supporting structure 24 can support the first base 111 and / or the second base 121, that is, one or two second supporting structures 24 can be provided. When one second supporting structure 24 is provided, the second supporting structure 24 can be provided below the first base 111 or the second base 121 for support. When two second supporting structures 24 are provided, the second supporting structures 24 can be provided below the first base 111 and the second base 121 for support, respectively. In this embodiment, by providing the second supporting structure 24, the first magnetic core 11 and the second magnetic core 12 can be prevented from circumferentially shaking relative to the skeleton 2.

[0085] In this embodiment, the second supporting structure 24 can be fixedly arranged on the side of the first supporting structure 23, or the second supporting structure 24 can also be directly connected to the body of the skeleton 2. Optionally, the first supporting structure 23 and the second supporting structure 24 can be integrally formed. The top surface of the first supporting structure 23 can fit the bottom surface contour of the first connecting plate 113 or the second connecting plate 123, and the top surface of the second supporting structure 24 can fit the bottom surface contour of the first bottom plate or the second bottom plate. Optionally, a limiting groove can be provided on the first supporting structure 23 or the second supporting structure 24 to further limit the first connecting plate 113 or the second connecting plate 123 and the first bottom plate or the second bottom plate. The entire skeleton 2 can be made of insulating material, for example, plastic or rubber material.

[0086] See also Fig. 9 The embodiment of the third aspect of the present invention provides a method for processing a miniature current transformer. Based on the miniature current transformer in any of the above embodiments, the method for processing the miniature current transformer specifically includes:

[0087] S100, obtaining a primary side winding, a secondary side winding, a skeleton and a magnetic core assembly;

[0088] S200, pre-embed the primary side winding in the skeleton, and reserve a first power connection structure for the primary side winding, that is, the primary side winding can be pre-placed in the processing and molding equipment of the skeleton and processed and molded together with the skeleton, or, a pre-embedded hole can be opened on the skeleton, and the primary side winding is inserted into the pre-embedded hole to realize the pre-embedding of the primary winding in the skeleton. The first power connection structure can be exposed or built-in, and can serve as a connection structure with the circuit under test.

[0089] S300, winding the secondary side winding on the frame, and fixing the second power connection structure of the secondary side winding on the frame, so as to realize the positioning of the secondary side winding and the primary side winding on the frame.

[0090] S400, installing the skeleton on the first magnetic core and the second magnetic core of the magnetic core assembly, and fixing the first magnetic core, the second magnetic core and the secondary side winding, so as to facilitate accurate fixing of the first magnetic core, the second magnetic core and the secondary side winding after positioning and reduce displacement.

[0091] In this embodiment, the primary winding is first embedded in the skeleton, and the primary winding and the skeleton are positioned, which reduces the winding steps of the primary winding during assembly and also reduces the volume of the micro current transformer. Then the secondary winding is wound on the skeleton, which is convenient for selecting and adjusting the winding path and winding position of the secondary winding based on the position of the primary winding, so as to ensure that there is sufficient insulation strength and coupling efficiency between the primary winding and the secondary winding. Then the skeleton and the secondary winding are integrally installed on the first magnetic core and the second magnetic core, and the overall fixation of the micro current transformer is achieved by fixing the first magnetic core, the second magnetic core and the secondary winding, avoiding mutual displacement between the first magnetic core, the second magnetic core and the secondary winding, thereby ensuring the uniformity and coupling efficiency of the magnetic flux, so that the magnetic flux distribution meets the needs of the current mutual inductance, ensuring the measurement accuracy of the micro current transformer, and reducing the error. This embodiment can not only reduce the overall volume of the micro current transformer, but also make the micro current transformer easy to assemble and ensure the measurement accuracy.

[0092] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A magnetic core component, characterized in that: The magnetic core assembly comprises: A first magnetic core (11), comprising a first base (111), a first mounting post (112) and a first connecting plate (113), wherein the first mounting post (112) and the first connecting plate (113) are arranged on the first base (111), and the first connecting plate (113) is arranged on one side of the first mounting post (112); The second magnetic core (12) comprises a second base (121), a second mounting post (122) and a second connecting plate (123); the second mounting post (122) and the second connecting plate (123) are arranged on the second base (121); the second connecting plate (123) is arranged on one side of the second mounting post (122); the second connecting plate (123) is correspondingly connected to the first connecting plate (113); and the second mounting post (122) is correspondingly connected to the first mounting post (112).

2. The magnetic core assembly according to claim 1, characterized in that: A first receiving groove (114) is provided on the surface of the first connecting plate (113) facing the first mounting column (112), the first receiving groove (114) is an arc-shaped groove, and the first receiving groove (114) is coaxially arranged with the first mounting column (112); and / or, A second receiving groove (124) is provided on the surface of the second connecting plate (123) facing the second mounting column (122); the second receiving groove (124) is an arc-shaped groove; the second receiving groove (124) is coaxially arranged with the second mounting column (122).

3. The magnetic core assembly according to claim 1, characterized in that: The first mounting column (112) and the first connecting plate (113) are both extended along a first direction, and the extension length of the first mounting column (112) is the same as the extension length of the first connecting plate (113); and / or, The second mounting column (122) and the second connecting plate (123) are both extended along the first direction, and the extension length of the second mounting column (122) is the same as the extension length of the second connecting plate (123).

4. A miniature current transformer, characterized in that: The micro current transformer comprises: The magnetic core assembly according to any one of claims 1 to 3; A frame (2), wherein a mounting hole (21) is provided in the frame (2), wherein the mounting hole (21) is extended along a first direction, wherein a wire winding groove (22) is provided on the frame (2), wherein the wire winding groove (22) is provided along the circumference of the mounting hole (21), and wherein the frame (2) is provided on the first mounting column (112) and the second mounting column (122) through the mounting hole (21); A primary side winding (3) is arranged in the frame (2), and the primary side winding (3) is arranged along the circumference of the mounting hole (21), and the primary side winding (3) has a first power connection structure (31); The secondary winding (4) is arranged in the winding groove (22), and the secondary winding (4) is arranged along the circumference of the mounting hole (21). The secondary winding (4) has a second power connection structure (41), and the second power connection structure (41) is arranged on the frame (2), and the second power connection structure (41) and the first power connection structure (31) are arranged on both sides of the winding groove (22).

5. The miniature current transformer according to claim 4, characterized in that: The primary side winding (3) comprises an annular sheet (32), wherein the annular sheet (32) is provided with a break to form a first end and a second end; The first power connection structure (31) comprises two lead-out pieces (311), one of the lead-out pieces (311) being arranged at the first end of the annular piece (32), and the other of the lead-out pieces (311) being arranged at the second end of the annular piece (32), and both of the lead-out pieces (311) being extended outward from the frame (2).

6. The miniature current transformer according to claim 4, characterized in that: The secondary side winding (4) comprises a coil (42), and the coil (42) is arranged in the winding slot (22); The second power connection structure (41) comprises two pins (411), one of the pins (411) is electrically connected to one end of the coil (42), and the other pin (411) is electrically connected to the other end of the coil (42), and the two pins (411) are fixedly arranged on the frame (2).

7. The miniature current transformer according to claim 6, characterized in that: A tin-immersion soldering structure is provided between the coil (42) and the pin (411); the end of the coil (42) is wound around the pin (411), and the end of the coil (42) is fixedly connected to the pin (411) via the tin-immersion soldering structure.

8. The miniature current transformer according to claim 6, characterized in that: The secondary winding (4) further comprises an insulating member (43), wherein the insulating member (43) is arranged along the circumference of the coil (42), and the insulating member (43) covers the entire circumferential side wall of the coil (42); and / or, An adhesive structure (5) is provided between the first connecting plate (113) and / or the second connecting plate (123) and the secondary side winding (4); the first connecting plate (113) and / or the second connecting plate (123) are fixedly connected to the surface of the secondary side winding (4) via the adhesive structure (5).

9. The miniature current transformer according to claim 4, characterized in that: A first supporting structure (23) is provided on the frame (2), the first supporting structure (23) is provided between the first base (111) and the second base (121), and the first supporting structure (23) is capable of supporting the first connecting plate (113) and / or the second connecting plate (123); and / or, A second supporting structure (24) is provided on the frame (2), and the second supporting structure (24) is capable of supporting the first base (111) and / or the second base (121).

10. A method for processing a miniature current transformer, characterized in that: Based on the miniature current transformer according to any one of claims 4 to 9, the processing method of the miniature current transformer comprises: Obtaining primary side winding, secondary side winding, bobbin and magnetic core assembly; The primary side winding is pre-buried in the frame, and the first power connection structure of the primary side winding is led out to the outside of the frame; Winding the secondary winding on the frame, and fixing the second power connection structure of the secondary winding on the frame; The skeleton is installed on the first magnetic core and the second magnetic core of the magnetic core assembly, and the first magnetic core, the second magnetic core and the secondary side winding are fixed.

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