WO2021017454A1 - 一种电流互感器 - Google Patents

一种电流互感器 Download PDF

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Publication number
WO2021017454A1
WO2021017454A1 PCT/CN2020/074679 CN2020074679W WO2021017454A1 WO 2021017454 A1 WO2021017454 A1 WO 2021017454A1 CN 2020074679 W CN2020074679 W CN 2020074679W WO 2021017454 A1 WO2021017454 A1 WO 2021017454A1
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Prior art keywords
magnetic core
rib support
secondary coil
current transformer
lead
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PCT/CN2020/074679
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English (en)
French (fr)
Inventor
李春
龚志良
朱仁波
邱东强
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东莞铭普光磁股份有限公司
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Publication of WO2021017454A1 publication Critical patent/WO2021017454A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F27/2852—Construction of conductive connections, of leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F2027/2857—Coil formed from wound foil conductor

Definitions

  • the present invention relates to the technical field of electric energy detection, in particular to a current transformer.
  • current transformers are widely used in multiple power applications such as detection and safety devices, such as motor protectors, battery charging devices, safe power devices, wireless charging devices, etc.
  • the working principle of current transformers the number of primary windings is small , String in the line that needs to measure the current, so all the current in the line flows, the number of turns of the secondary winding is relatively large, and it is connected in series in the measuring instrument and the protection circuit.
  • the current transformer When the current transformer is working, its secondary circuit It is always closed, so the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit.
  • the current transformer is used to convert a large current on the primary side into a small current on the secondary side, and the secondary side cannot be opened. With the development of miniaturization and thinning of electronic products, current transformers are required to be miniaturized and ultra-thin.
  • the magnetic ring of the current transformer is wound with a metal wire to form a secondary coil 2', and the primary coil 3'with a rubber tube passes through the magnetic ring and passes through the secondary coil 2'.
  • the glue is fixed on the bakelite base 1'.
  • the pins of the secondary coil 2'are peeled and immersed in tin and the leads are wound on the secondary
  • the pin of the primary coil 3' is peeled and tinned and the lead wire is wound on the PIN pin 5'of the primary coil.
  • the overall size of this current transformer is still relatively large, which cannot meet the low-height requirements of new application scenarios.
  • the invention provides a current transformer. Through an innovative magnetic core structure design method, not only the structure is compact, the height is low, and the size is small, but also the automatic production is facilitated.
  • an embodiment of the present invention provides a current transformer, including a body, the body includes a first magnetic core and a second magnetic core, the second magnetic core includes a central column wound with a secondary coil The winding portion and the first rib support portion and the second rib support portion that connect the center column winding portion rib support to the first magnetic core, and the first rib support portion is connected to the One end of the central column winding part is fixed to one side of the first magnetic core, and the second rib support part is connected to the other end of the central column winding part and fixed to the other end of the first magnetic core.
  • One side; the gap between the central column winding portion and the first magnetic core is provided with a primary coil.
  • a plurality of secondary coil lead pads and a plurality of primary coil pin pads are provided on the top of the first rib support portion and the top of the second rib support portion.
  • the primary coil is a copper foil winding.
  • two primary coil terminal pins for welding are connected to the copper foil winding, and the ends of the primary coil terminal pins are bent and formed toward the outside of the copper foil winding;
  • the two primary coil terminal pins abut on the same side and are welded on the pad of the first rib support part or the pad of the second rib support part; or
  • One of the primary coil terminal pins is attached to and welded to the pad of the first rib support portion, and the other of the primary coil terminal pins is attached to and welded to the second rib support portion On the pad.
  • both sides of the copper foil winding are bent toward the second magnetic core to form a bent part, and the two bent parts of the copper foil winding are located on two sides of the central column winding part. Between the side and the first rib support portion and the second rib support portion.
  • each bending portion is folded outward to form a folded portion.
  • one pin of the secondary coil is welded to one of the primary coil lead pads of the first rib support portion, and the other pin of the secondary coil is welded to the first gear.
  • One lead of the secondary coil is welded to one of the primary coil lead pads of the second rib support part, and the other lead of the secondary coil is welded to the other one of the second rib support part On the lead pad of the secondary coil.
  • one lead of the secondary coil is welded to one of the primary coil lead pads of the first rib support part, and the other lead of the secondary coil is welded to the second rib support On the lead pad of one of the secondary coils.
  • the first magnetic core and the second magnetic core are both soft magnetic nickel zinc ferrite or manganese zinc ferrite cores.
  • the first magnetic core has a rectangular plate-shaped structure
  • the cross section of the second magnetic core has an I-shaped structure
  • the first magnetic core and the second magnetic core are fixedly connected by dispensing glue.
  • the first magnetic core and the second magnetic core are assembled, the primary coil is arranged between the first magnetic core and the second magnetic core, and the first magnetic
  • the central column winding part of the core is wound with a secondary coil, wherein the pins of the primary coil and the secondary coil can be flexibly drawn out and arranged on the first rib support part and/the second rib support part on.
  • the second magnetic core adopts an "H" type structure
  • the first magnetic core adopts a plate structure, and the two are assembled to replace the magnetic ring in the prior art. Through such a flat design, it can be effectively Ground to reduce the height of the current transformer.
  • center column winding portion is used to wind the secondary coil, and the primary coil using copper foil winding or the like is provided in the gap between the center column winding portion and the first magnetic core. Effectively reduce the difficulty of assembling the current transformer, thereby helping to improve production efficiency.
  • Figure 1 is a schematic diagram of the structure of a current transformer in the prior art
  • FIG. 2 is a schematic diagram of the structure of a current transformer according to the first embodiment of the present invention.
  • Figure 3 is an exploded view of the current transformer in the first embodiment of the present invention.
  • Fig. 4 is a schematic diagram of another structure of the secondary coil in Fig. 3;
  • Fig. 5 is a schematic diagram of another structure of the primary coil in Fig. 3;
  • Fig. 6 is a schematic diagram of another structure of the primary coil in Fig. 3;
  • FIG. 7 is a schematic diagram of the structure of a current transformer according to the second embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a current transformer according to the third embodiment of the present invention.
  • FIG. 9 is a schematic diagram of the structure of a current transformer according to the fourth embodiment of the present invention.
  • FIG. 10 is a schematic diagram of the structure of a current transformer according to the fifth embodiment of the present invention.
  • FIG. 11 is a schematic diagram of the structure of a current transformer according to the sixth embodiment of the present invention.
  • the second magnetic core 21. The winding part of the central column; 22. The first rib support portion; 23. The second rib support portion; 24. Secondary coil lead pad; 25. Primary coil pin pad ;
  • Embodiment 1 of the present invention is a diagrammatic representation of Embodiment 1 of the present invention.
  • the first embodiment of the present invention provides a current transformer, including a body, the body includes a first magnetic core 1 and a second magnetic core 2, the second magnetic core 2 includes a secondary coil 4 wound
  • the column winding portion 21 and the first rib support portion 22 and the second rib support portion 23 that connect the center column winding portion 21 to the first magnetic core 1 and the first rib support portion 22 are connected
  • One end of the column winding portion 21 is fixed on one side of the first magnetic core 1
  • the second rib support portion 23 is connected to the other end of the central column winding portion 21 and fixed on the other side of the first magnetic core 1
  • a primary coil 3 is provided in the gap between the column winding portion 21 and the first magnetic core 1.
  • the first magnetic core 1 and the second magnetic core 2 are assembled.
  • the primary coil 3 is arranged between the first magnetic core 1 and the second magnetic core 2.
  • the first magnetic core The central column winding portion 21 of 1 is wound around the secondary coil 4, wherein the pins of the primary coil 3 and the secondary coil 4 can be flexibly drawn out and arranged on the first rib support portion 22 and/or the second rib support portion 23.
  • the second magnetic core 2 adopts an "H" structure, and the first magnetic core 1 adopts a plate structure.
  • the two are assembled to replace the magnetic ring in the prior art. Through such a flat design, it can effectively reduce The height of the current transformer.
  • center-pillar winding part 21 is used to wind the secondary coil 4, and the primary coil 3 using copper foil winding or the like is provided in the gap between the center-pillar winding part 21 and the first magnetic core 1, which can effectively reduce the current mutual inductance. It is difficult to assemble the device, which helps to improve production efficiency.
  • the top of the first rib support portion 22 and the top of the second rib support portion 23 are each provided with several secondary coil lead pads 24 and several Primary coil lead pad 25.
  • the design of electroplated pin pads on the second magnetic core 2 can effectively facilitate the automatic welding of wires and pins, and realizes the automatic production of the whole process from automatic winding to wire welding; among them, the second magnetic core 2
  • the pad electrode is surface-mounted with SMD structure, which can have better coplanarity.
  • the first magnetic core 1 and the second magnetic core 2 are both soft ferrite cores.
  • Soft magnetic materials include nickel-zinc ferrite and manganese-zinc ferrite to ensure that the maximum operating temperature is 125°C, and the Curie temperature Tc must exceed 125°C.
  • the first magnetic core 1 has a rectangular plate-shaped structure
  • the cross section of the second magnetic core 2 has an I-shaped structure.
  • the first magnetic core 1 and the second magnetic core 2 are fixedly connected by dispensing glue, saving The original structure dispensing fixed magnetic core and fixed base and pin insertion PIN needle process.
  • it has a chip ultra-thin design, and has a closed magnetic core structure similar to a magnetic ring.
  • the structure of the two magnetic cores can be Lower height dimensions, while minimizing the footprint of the product PCB package under the same electrical conditions.
  • the primary coil 3 is a copper foil winding, and the copper foil winding has a good overcurrent capability, and at the same time, the winding process and the manufacturing man-hours are saved.
  • Two primary coil terminal pins 31 for welding are connected to the copper foil winding. The ends of the primary coil terminal pins 31 are bent toward the outside of the copper foil winding to form; the two primary coil terminal pins 31 abut on the same side Welded on the first rib support 22 or the second rib support 23.
  • the first magnetic core 1 and the second magnetic core 2 are made of nickel-zinc ferrite, and the bottom surface of the second magnetic core 2 is electroplated with tin on the secondary coil
  • the lead pads and the primary coil lead pads are separated from each other.
  • the secondary coil 4 is wound on the cylindrical center-pillar winding part 21, and the lead of the secondary coil 4 is welded to the bottom surface of the second magnetic core 2.
  • the lead pad of the secondary coil, and the copper foil winding pin is also welded on the bottom surface of the second magnetic core 2 on the electro-tinned primary coil pin pad.
  • the coil winding and the copper winding are separated by a distance, and then the The first magnetic core 1 and the second magnetic core 2 are assembled and fixed by epoxy glue.
  • the bottom of its pin is used as the pad part.
  • various shapes of pins can be designed to be suitable for various PCB packaging.
  • the winding can be Z-shaped, U-shaped or ⁇ -shaped.
  • the winding start lead and end lead of the secondary coil 4 can be in the same direction, or the winding start lead and end lead are not on the same side, that is, a lead of the secondary coil 4 is welded to the first rib.
  • the present invention has a variety of structural design solutions, which are described in detail through the following embodiments:
  • the second embodiment of the present invention changes the position of the start lead pin and the end lead pin of the secondary winding, and the connection relationship is as follows:
  • one of the leads of the secondary coil 4 is welded to the secondary coil lead pad of the first rib support part, and the other lead is welded to the secondary coil lead pad of the second rib support part The upper, so that the start lead and the end lead of the secondary coil are respectively welded on opposite sides; finally, the first magnetic core 1, the second magnetic core 2, the secondary coil 4, etc. are assembled into a current transformer.
  • the third embodiment of the present invention improves the pins of the copper foil winding, and both sides of the copper foil winding are bent toward the second magnetic core 2 to form a bend
  • the two bending portions 32 of the copper foil winding are located between the two sides of the central column winding portion 21 and the first rib support portion 22 and the second rib support portion 23.
  • the starting lead of the secondary coil 4 is welded to one of the secondary coil lead pads 24 of the second rib support 23, and the end lead of the secondary coil 4 is welded to the second rib support.
  • the other secondary coil lead pad 24 of the part 23 is welded on the same side as the start lead and end lead of the secondary coil 4; finally, the first magnetic core 1, the second magnetic core 2, and the copper foil winding , The secondary coil 4, etc. are assembled into a current transformer as shown in Figure 8.
  • the fourth embodiment of the present invention changes the position of the start and end leads of the secondary winding, and one of the leads of the secondary coil 4 is welded to the first gear.
  • the secondary coil lead pad of the side support part On the secondary coil lead pad of the side support part, and the other lead is on the secondary coil lead pad of the second rib support part. So that the start lead and end lead of the secondary coil are respectively welded on opposite sides; finally, the first magnetic core 1, the second magnetic core 2, the copper foil winding, the secondary coil 4, etc. are assembled into a current transformer.
  • Embodiment 5 of the present invention is a diagrammatic representation of Embodiment 5 of the present invention.
  • the fifth embodiment of the present invention improves the pins of the copper foil winding, and both sides of the copper foil winding are bent toward the second magnetic core 2 to form a bend Section 32, the two bending portions 32 of the copper foil winding are located between the two sides of the central column winding portion 21 and the first rib support portion 22, the second rib support portion 23, and the bending portion 32 of each The ends are folded outward to form a folded portion 33.
  • the starting lead of the secondary coil 4 is welded to one of the secondary coil lead pads 24 of the second rib support 23, and the end lead of the secondary coil 4 is welded to the second rib support
  • the other secondary coil lead pad 24 of the part 23 is welded on the same side as the start lead and end lead of the secondary coil 4; finally, the first magnetic core 1, the second magnetic core 2, and the copper foil winding , The secondary coil 4, etc. are assembled into a current transformer.
  • Embodiment 6 of the present invention is a diagrammatic representation of Embodiment 6 of the present invention.
  • the fifth embodiment of the present invention changes the position of the start and end leads of the secondary winding, and one of the leads of the secondary coil 4 is welded to the first gear.
  • the secondary coil lead pad of the side support part On the secondary coil lead pad of the side support part, and the other lead is welded to the secondary coil lead pad of the second rib support part, so that the start lead and the end lead of the secondary coil are respectively welded on two opposite sides.
  • Side Finally, the first magnetic core 1, the second magnetic core 2, the copper foil winding, the secondary coil 4, etc. are assembled into a current transformer.

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  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

本发明公开了一种电流互感器，包括本体，所述本体包括第一磁芯和第二磁芯，所述第二磁芯包括缠绕有次级线圈的中柱绕线部和将所述中柱绕线部挡边支撑连接在所述第一磁芯上的第一挡边支撑部、第二挡边支撑部，所述第一挡边支撑部连接所述中柱绕线部的一端并固定在所述第一磁芯的一侧，所述第二挡边支撑部连接所述中柱绕线部的另一端并固定在所述第一磁芯的另一侧；所述中柱绕线部与所述第一磁芯之间的间隙设有初级线圈。本发明实施例提供的电流互感器具有创新的磁芯结构设计方式，不仅结构紧凑、高度较低、尺寸较小，而且有利于自动化生产。

Description

一种电流互感器 技术领域
本发明涉及电能检测技术领域，尤其是涉及一种电流互感器。
背景技术
目前，电流互感器广泛应用于检测和保险装置等多个用电领域，如电动机保护器、电瓶充电装置、安全用电装置，无线充电装置等，电流互感器工作原理：初级绕组匝数很少，串在需要测量的电流的线路中，因此在线路的全部电流流过，次级绕组匝数比较多，串接在测量仪表和保护回路中，电流互感器在工作时，它的次级回路始终是闭合的，因此测量仪表和保护回路串联线圈的阻抗很小，电流互感器的工作状态接近短路。电流互感器是把一次侧大电流转换成二次侧小电流来使用，二次侧不可开路。随着电子产品的小型号化和轻薄化发展，要求电流互感器也要小型化和超薄化。
现有技术中，如图1所示，电流互感器的磁环缠绕金属线以形成次级线圈2′，套设有胶管的初级线圈3′穿过磁环并与次级线圈2′通过点胶固定在电木底座1′上，电木底座1′下设有次级线圈PIN脚4′和初级线圈PIN脚5′，次级线圈2′的引脚去皮浸锡与引线缠绕在次级线圈PIN脚4′上，初级线圈3′的引脚去皮浸锡与引线缠绕在初级线圈PIN脚5′上。但是这种电流互感器的整体尺寸仍然较大，无法满足新的应用场景低高度的要求。
发明内容
本发明提供一种电流互感器，通过创新的磁芯结构设计方式，不仅结构紧凑、高度较低、尺寸较小，而且有利于自动化生产。
为了解决上述技术问题，本发明实施例提供了一种电流互感器，包括本体，所述本体包括第一磁芯和第二磁芯，所述第二磁芯包括缠绕有次级线圈的中柱绕线部和将所述中柱绕线部挡边支撑连接在所述第一磁芯上的第一挡边支撑部、第二挡边支撑部，所述第一挡边支撑部连接所述中柱绕线部的一端并固定在所述第 一磁芯的一侧，所述第二挡边支撑部连接所述中柱绕线部的另一端并固定在所述第一磁芯的另一侧；所述中柱绕线部与所述第一磁芯之间的间隙设有初级线圈。
作为优选方案，所述第一挡边支撑部的顶部、所述第二挡边支撑部的顶部上均设有若干次级线圈引线焊盘、若干初级线圈引脚焊盘。
作为优选方案，所述初级线圈为铜箔绕组。
作为优选方案，所述铜箔绕组上连接有用于焊接的两个初级线圈端子引脚，所述初级线圈端子引脚的端部朝向所述铜箔绕组的外侧弯折成型；
两个所述初级线圈端子引脚同侧贴靠并焊接在所述第一挡边支撑部的焊盘上或所述第二挡边支撑部的焊盘上；或
其中一个所述初级线圈端子引脚贴靠并焊接在所述第一挡边支撑部的焊盘上，其中另一个所述初级线圈端子引脚贴靠并焊接在所述第二挡边支撑部的焊盘上。
作为优选方案，所述铜箔绕组的两侧均朝向所述第二磁芯弯折形成弯折部，所述铜箔绕组的两个所述弯折部位于所述中柱绕线部的两侧和所述第一挡边支撑部、所述第二挡边支撑部之间。
作为优选方案，每一所述弯折部的端部向外翻折形成翻折部。
作为优选方案，所述次级线圈的一引脚焊接在所述第一挡边支撑部的其中一次级线圈引线焊盘上，所述次级线圈的另一引脚焊接在所述第一挡边支撑部的其中另一次级线圈引线焊盘上；或
所述次级线圈的一引线焊接在所述第二挡边支撑部的其中一次级线圈引线焊盘上，所述次级线圈的另一引线焊接在所述第二挡边支撑部的其中另一次级线圈引线焊盘上。
作为优选方案，所述次级线圈的一引线焊接在所述第一挡边支撑部的其中一次级线圈引线焊盘上，所述次级线圈的另一引线焊接在所述第二挡边支撑部的其中一次级线圈引线焊盘上。
作为优选方案，所述第一磁芯、所述第二磁芯均为软磁镍锌铁氧体或锰锌铁氧体磁芯。
作为优选方案，所述第一磁芯呈矩形板状结构，所述第二磁芯的截面呈工字型结构，所述第一磁芯与所述第二磁芯通过点胶固定连接。
相比于现有技术，本发明实施例具有如下有益效果：
通过设计新的磁芯结构，将所述第一磁芯、所述第二磁芯组装，所述第一磁芯与所述第二磁芯之间设置所述初级线圈，所述第一磁芯的中柱绕线部缠绕次级线圈，其中，所述初级线圈、所述次级线圈的引脚可灵活引出设置在所述第一挡边支撑部和/所述第二挡边支撑部上。
所述第二磁芯采用“H”型结构，所述第一磁芯采用板式结构，两者之间进行组装，从而取代了现有技术中的磁环，通过这样的扁平化设计，能够有效地降低电流互感器的高度。
此外，所述中柱绕线部用于缠绕所述次级线圈，采用铜箔绕组等的所述初级线圈设于所述中柱绕线部与所述第一磁芯之间的间隙，能够有效地降低电流互感器的组装难度，从而有利于提高生产效率。
附图说明
图1是现有技术的电流互感器的结构示意图；
图2是本发明实施例一的电流互感器的结构示意图；
图3是本发明实施例一的电流互感器的爆炸图；
图4是图3中次级线圈的另一种结构示意图；
图5是图3中初级线圈的另一种结构示意图；
图6是图3中初级线圈的又一种结构示意图；
图7是本发明实施例二的电流互感器的结构示意图；
图8是本发明实施例三的电流互感器的结构示意图；
图9是本发明实施例四的电流互感器的结构示意图；
图10是本发明实施例五的电流互感器的结构示意图；
图11是本发明实施例六的电流互感器的结构示意图；
其中，说明书附图中的附图标记如下：
1、第一磁芯；
2、第二磁芯；21、中柱绕线部；22、第一挡边支撑部；23、第二挡边支撑部；24、次级线圈引线焊盘；25、初级线圈引脚焊盘；
3、初级线圈；31、初级线圈端子引脚的端部；32、弯折部；33、翻折部；
4、次级线圈。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例一：
请参见图2和图3，本发明实施例一提供了电流互感器，包括本体，本体包括第一磁芯1和第二磁芯2，第二磁芯2包括缠绕有次级线圈4的中柱绕线部21和将中柱绕线部21挡边支撑连接在第一磁芯1上的第一挡边支撑部22、第二挡边支撑部23，第一挡边支撑部22连接中柱绕线部21的一端并固定在第一磁芯1的一侧，第二挡边支撑部23连接中柱绕线部21的另一端并固定在第一磁芯1的另一侧；中柱绕线部21与第一磁芯1之间的间隙设有初级线圈3。
在本实施例中，通过设计新的磁芯结构，将第一磁芯1、第二磁芯2组装，第一磁芯1与第二磁芯2之间设置初级线圈3，第一磁芯1的中柱绕线部21缠绕次级线圈4，其中，初级线圈3、次级线圈4的引脚可灵活引出设置在第一挡边支撑部22和/第二挡边支撑部23上。
第二磁芯2采用“H”型结构，第一磁芯1采用板式结构，两者之间进行组装，从而取代了现有技术中的磁环，通过这样的扁平化设计，能够有效地降低电流互感器的高度。
此外，中柱绕线部21用于缠绕次级线圈4，采用铜箔绕组等的初级线圈3设于中柱绕线部21与第一磁芯1之间的间隙，能够有效地降低电流互感器的组装难度，从而有利于提高生产效率。
请参见图3，在本发明实施例中，为了使结构合理化，第一挡边支撑部22 的顶部、第二挡边支撑部23的顶部上均设有若干次级线圈引线焊盘24、若干初级线圈引脚焊盘25。在第二磁芯2上设计电镀引脚焊盘，能够有效地方便线材与引脚的自动焊接，实现了从全自动绕线到引线焊接全过程自动化生产；其中，第二磁芯2上的焊盘电极作SMD结构表面贴装，能够具有更好的共面度。
在本发明实施例中，应当说明的是，第一磁芯1、第二磁芯2均为软磁铁氧体磁芯。软磁材料包括镍锌铁氧体和锰锌铁氧体，以确保最大的工作温度在125℃，居里温度Tc必须超125摄氏度。
在本发明实施例中，第一磁芯1呈矩形板状结构，第二磁芯2的截面呈工字型结构，第一磁芯1与第二磁芯2通过点胶固定连接，节省了原有结构点胶固定磁芯与固定底座及引脚插PIN针工序。这样通过揉合第一磁芯1和第二磁芯2，使之具有片式超薄化设计，又具备类似磁环类闭合的磁芯结构，采用两个磁芯贴合的结构，能够具有更低的高度尺寸，同时实现同等电性条件下产品PCB封装占用空间的最小化。
在本实施例中，作为优选的，初级线圈3为铜箔绕组，铜箔绕组具有很好的过流能力，同时节省了绕线工序及其制作工时。铜箔绕组上连接有用于焊接的两个初级线圈端子引脚31，初级线圈端子引脚31的端部朝向铜箔绕组的外侧弯折成型；两个初级线圈端子引脚31同侧贴靠焊接在第一挡边支撑部22或第二挡边支撑部23上。
请继续参见图2和图3，在本实施例一中，第一磁芯1、第二磁芯2采用镍锌铁氧体材质，第二磁芯2的底面凸台电镀锡的次级线圈引线焊盘、初级线圈引脚焊盘拉开间距隔离，次级线圈4绕在柱状的中柱绕线部21上，次级线圈4的引线焊接在第二磁芯2的底面凸台电镀锡次级线圈引线焊盘上，同时铜箔绕组引脚也焊接在第二磁芯2的底面凸台电镀锡初级线圈引脚焊盘上，线圈绕组与铜泊绕组拉开间距隔离，然后再将第一磁芯1与第二磁芯2组装，进行点环氧胶固定。
在本发明实施例中，作为初级线圈的铜箔绕组，其引脚底部用作焊盘部分，可以根据生产研发的不同需求，设计出各种形状的引脚以适用各种PCB封装， 铜泊绕组可以为Z形、U形或Ω形。而次级线圈4的绕线起始引线和结束引线可以在同一边方向，也可以是绕线起始引线和结束引线不在同一边，也即次级线圈4的一引线焊接在第一挡边支撑部22/第二挡边支撑部23的其中一个次级线圈引线焊盘24上，次级线圈4的另一引线焊接在第一挡边支撑部22/第二挡边支撑部23的其中另一个次级线圈引线焊盘24上，或次级线圈4的一引线焊接在第一挡边支撑部22的其中一个次级线圈引线焊盘24上，次级线圈4的另一引线焊接在第二挡边支撑部23的其中一个次级线圈引线焊盘24上。因此，本发明具有多种结构设计方案，通过以下实施例进行详细介绍：
本发明实施例二：
请参见图4，在本发明实施例一的基础上，本发明实施例二对所述次级绕组的起始引线脚、结束引线脚进行位置变换，连接关系如下：
如图7所示，次级线圈4的其中一引线焊接在第一挡边支撑部的次级线圈引线焊盘上，其中另一引线焊接在第二挡边支撑部的次级线圈引线焊盘上，以使次级线圈的起始引线、结束引线分别焊接在相对两侧；最后将第一磁芯1、第二磁芯2、次级线圈4等组装成电流互感器。
本发明实施例三：
请参见图5，在本发明实施例一的基础上，本发明实施例三对所述铜箔绕组的引脚进行改进，铜箔绕组的两侧均朝向第二磁芯2弯折形成弯折部32，铜箔绕组的两个弯折部32位于中柱绕线部21的两侧和第一挡边支撑部22、第二挡边支撑部23之间。
如图8所示，将次级线圈4的起始引线焊接在第二挡边支撑部23的其中一个次级线圈引线焊盘24上，次级线圈4的结束引线焊接在第二挡边支撑部23的其中另一个次级线圈引线焊盘24上，以使次级线圈4的起始引线、结束引线焊接在同一侧；最后将第一磁芯1、第二磁芯2、铜箔绕组、次级线圈4等组装成如图8所示电流互感器。
本发明实施例四：
请参见图9，在本发明实施例三的基础上，本发明实施例四对所述次级绕组 的起始线、结束引线进行位置变换，次级线圈4的其中一引线焊接在第一挡边支撑部的次级线圈引线焊盘上，其中另一引线在第二挡边支撑部的次级线圈引线焊盘上。以使次级线圈的起始引线、结束引线分别焊接在相对两侧；最后将第一磁芯1、第二磁芯2、铜箔绕组、次级线圈4等组装成电流互感器。
本发明实施例五：
请参见图6，在本发明实施例一的基础上，本发明实施例五对所述铜箔绕组的引脚进行改进，铜箔绕组的两侧均朝向第二磁芯2弯折形成弯折部32，铜箔绕组的两个弯折部32位于中柱绕线部21的两侧和第一挡边支撑部22、第二挡边支撑部23之间，且每一弯折部32的端部向外翻折形成翻折部33。
如图10所示，将次级线圈4的起始引线焊接在第二挡边支撑部23的其中一个次级线圈引线焊盘24上，次级线圈4的结束引线焊接在第二挡边支撑部23的其中另一个次级线圈引线焊盘24上，以使次级线圈4的起始引线、结束引线焊接在同一侧；最后将第一磁芯1、第二磁芯2、铜箔绕组、次级线圈4等组装成电流互感器。
本发明实施例六：
请参见图11，在本发明实施例五的基础上，本发明实施例五对所述次级绕组的起始线、结束引线进行位置变换，次级线圈4的其中一引线焊接在第一挡边支撑部的次级线圈引线焊盘上，其中另一引线焊接在第二挡边支撑部的次级线圈引线焊盘上，以使次级线圈的起始引线、结束引线分别焊接在相对两侧；最后将第一磁芯1、第二磁芯2、铜箔绕组、次级线圈4等组装成电流互感器。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (10)

  1. 一种电流互感器，其特征在于，包括本体，所述本体包括第一磁芯和第二磁芯，所述第二磁芯包括缠绕有次级线圈的中柱绕线部和将所述中柱绕线部挡边支撑连接在所述第一磁芯上的第一挡边支撑部、第二挡边支撑部，所述第一挡边支撑部连接所述中柱绕线部的一端并固定在所述第一磁芯的一侧，所述第二挡边支撑部连接所述中柱绕线部的另一端并固定在所述第一磁芯的另一侧；所述中柱绕线部与所述第一磁芯之间的间隙设有初级线圈。
  2. 如权利要求1所述的电流互感器，其特征在于，所述第一挡边支撑部的顶部、所述第二挡边支撑部的顶部上均设有若干次级线圈引线焊盘、若干初级线圈引脚焊盘。
  3. 如权利要求1或2所述的电流互感器，其特征在于，所述初级线圈为铜箔绕组。
  4. 如权利要求3所述的电流互感器，其特征在于，所述铜箔绕组上连接有用于焊接的两个初级线圈端子引脚，所述初级线圈端子引脚的端部朝向所述铜箔绕组的外侧弯折成型；
    两个所述初级线圈端子引脚同侧贴靠并焊接在所述第一挡边支撑部的焊盘上或所述第二挡边支撑部的焊盘上；或
    其中一个所述初级线圈端子引脚贴靠并焊接在所述第一挡边支撑部的焊盘上，其中另一个所述初级线圈端子引脚贴靠并焊接在所述第二挡边支撑部的焊盘上。
  5. 如权利要求3所述的电流互感器，其特征在于，所述铜箔绕组的两侧均朝向所述第二磁芯弯折形成弯折部，所述铜箔绕组的两个所述弯折部位于所述中柱绕线部的两侧和所述第一挡边支撑部、所述第二挡边支撑部之间。
  6. 如权利要求5所述的电流互感器，其特征在于，每一所述弯折部的端部向外翻折形成翻折部。
  7. 如权利要求2所述的电流互感器，其特征在于，所述次级线圈的一引线焊接在所述第一挡边支撑部的其中一次级线圈引线焊盘上，所述次级线圈的另一引线焊接在所述第一挡边支撑部的其中另一次级线圈引线焊盘上；或
    所述次级线圈的一引线焊接在所述第二挡边支撑部的其中一次级线圈引线焊盘上，所述次级线圈的另一引线焊接在所述第二挡边支撑部的其中另一次级线圈引线焊盘上。
  8. 如权利要求2所述的电流互感器，其特征在于，所述次级线圈的一引线焊接在所述第一挡边支撑部的其中一次级线圈引线焊盘上，所述次级线圈的另一引线焊接在所述第二挡边支撑部的其中一次级线圈引线焊盘上。
  9. 如权利要求1所述的电流互感器，其特征在于，所述第一磁芯、所述第二磁芯均为软磁镍锌铁氧体或锰锌铁氧体磁芯。
  10. 如权利要求1所述的电流互感器，其特征在于，所述第一磁芯呈矩形板状结构，所述第二磁芯的截面呈工字型结构，所述第一磁芯与所述第二磁芯通过点胶固定连接。
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