CN-119724847-B - Current transformer

CN119724847BCN 119724847 BCN119724847 BCN 119724847BCN-119724847-B

Abstract

The invention discloses a current transformer which comprises a framework, a winding, a first magnetic core, a second magnetic core, a first terminal and a second terminal, wherein the framework comprises a first side part, a second side part and a connecting part, the connecting part is of a hollow cylinder structure, the first side part and the second side part are respectively integrally connected with two ends of the connecting part, the winding is wound on the outer wall of the connecting part, the first terminal and the second terminal are respectively connected to the first side part and the second side part and are respectively electrically connected with the winding, the first magnetic core and the second magnetic core respectively adopt a U-shaped blade structure, openings of the U-shaped blade structures of the first magnetic core and the second magnetic core are oppositely connected to the framework, the first ends of the U-shaped blade structures of the first magnetic core and the second magnetic core are mutually connected in an inner cavity of the connecting part, and the second ends of the U-shaped blade structures of the first magnetic core and the second magnetic core are mutually connected above the winding. The current transformer provided by the invention not only can reduce the magnetic core loss, but also can enhance the EMC effect of the product.

Inventors

CAI JINBO
LEI XIAODONG
LIU YUQI
LIU XIANG

Assignees

东莞顺络功率器件有限公司

Dates

Publication Date: 20260508
Application Date: 20241231

Claims (9)

1. A current transformer is characterized by comprising a framework, a winding, a first magnetic core, a second magnetic core, a first terminal and a second terminal, The framework comprises a first side part, a second side part and a connecting part, wherein the connecting part is of a hollow cylinder structure, and the first side part and the second side part are respectively and integrally connected with two ends of the connecting part; The first magnetic core and the second magnetic core adopt U-shaped blade structures respectively, and openings of the U-shaped blade structures of the first magnetic core and the second magnetic core are oppositely connected to the framework, wherein first ends of the U-shaped blade structures of the first magnetic core and the second magnetic core are mutually connected in an inner cavity of the connecting part, and second ends of the U-shaped blade structures of the first magnetic core and the second magnetic core are mutually connected above the winding; Wherein: the first terminal includes a first primary coil and a first secondary terminal disposed between both ends of the first primary coil and electrically connected with the winding, and/or, The second terminal includes a second primary coil and a second secondary terminal, the second secondary terminal is disposed between two ends of the second primary coil, and the second secondary terminal is electrically connected with the winding.
2. The current transformer of claim 1, wherein the first terminal and the second terminal are integrally connected to the first side and the second side, respectively.
3. The current transformer of claim 2, wherein the armature is formed by injection molding, and the first and second terminals are placed in an injection mold to be integrally connected to the first and second sides, respectively, prior to injection molding the armature.
4. The current transformer according to claim 1, wherein the first secondary terminal comprises 1 to 5 first sub-secondary terminals, each of the first sub-secondary terminals being disposed in parallel with each other between both ends of the first primary coil, and/or, The second secondary terminal includes 1 to 5 second sub-secondary terminals, each of which is disposed in parallel with each other between both ends of the second primary coil.
5. The current transformer according to claim 4, wherein the width of the end portion of the first primary coil is larger than the width of the end portion of each of the first sub-secondary terminals, and/or, The width of the end of the second primary coil is larger than the width of the end of each second sub-secondary terminal.
6. The current transformer according to claim 5, wherein the width of the end portion of the first primary coil is 1.2 to 3 times the width of the end portion of each of the first sub-secondary terminals, and/or, The width of the end of the second primary coil is 1.2 to 3 times the width of the end of each of the second sub-secondary terminals.
7. The current transformer of claim 4, wherein each of the first sub-secondary terminals is a C-PIN, an L-PIN, or a gull-PIN, and/or each of the second sub-secondary terminals is a C-PIN, an L-PIN, or a gull-PIN.
8. The current transformer of claim 1, wherein a thickness of a top blade of the first and second magnetic cores structurally located above the windings is greater than or equal to 0.5mm.
9. The current transformer of claim 1, wherein the U-shaped blades of the first and second magnetic cores are each semi-circular, semi-elliptical or polygonal in shape with a top blade structurally above the windings.

Description

Current transformer Technical Field The invention relates to the technical field of current transformers, in particular to a current transformer. Background Currently, the main current transformer uses an EE-type magnetic core, an EF-type magnetic core or an EP-type magnetic core and a corresponding skeleton. These current transformers have the following problems: (1) In the use process, the problem of serious loss exists, and when the magnetic core works in an alternating magnetic field, particularly a driving transformer under a high-frequency environment, hysteresis loss and eddy current loss are more serious; (2) The magnetic cores can be subjected to various mechanical stress during the manufacturing, transportation and use processes, and if the mechanical strength is insufficient, the problem of magnetic core cracking easily occurs, so that the performance and the reliability of the transformer are affected; (3) The main material of the magnetic core used by the current transformer is manganese zinc ferrite, the price is relatively high, and the manufacturing cost of the transformer can be increased; (4) The mechanical strength of the terminal of the current transformer may be insufficient, and if fatigue crack occurs in the terminal, the terminal gradually expands until the terminal breaks, so that the terminal cannot work normally. The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the application and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by virtue of prior application or that it is already disclosed at the date of filing of this application. Disclosure of Invention In order to solve the technical problems, the invention provides a current transformer which not only can reduce the magnetic core loss, but also can enhance the EMC (Electro Magnetic Compatibility ) effect of products. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention discloses a current transformer which comprises a framework, a winding, a first magnetic core, a second magnetic core, a first terminal and a second terminal, wherein the framework comprises a first side part, a second side part and a connecting part, the connecting part is of a hollow cylinder structure, the first side part and the second side part are respectively integrally connected to two ends of the connecting part, the winding is wound on the outer wall of the connecting part, the first terminal and the second terminal are respectively connected to the first side part and the second side part and are respectively and electrically connected with the winding, the first magnetic core and the second magnetic core are respectively of U-shaped blade structures, openings of the U-shaped blade structures of the first magnetic core and the second magnetic core are oppositely connected to the framework, the first ends of the U-shaped blade structures of the first magnetic core and the second magnetic core are mutually connected to inner cavities of the connecting part, and the second ends of the U-shaped blade structures of the first magnetic core and the second magnetic core are mutually connected to the upper side of the winding. Further, the first terminal and the second terminal are integrally connected to the first side portion and the second side portion, respectively. Further, the frame is made by injection molding, and the first terminal and the second terminal are placed in an injection mold to be integrally connected to the first side portion and the second side portion, respectively, before the frame is injection molded. Further, the first terminal includes a first primary coil and a first secondary terminal disposed between both ends of the first primary coil and electrically connected to the winding, and/or, The second terminal includes a second primary coil and a second secondary terminal, the second secondary terminal is disposed between two ends of the second primary coil, and the second secondary terminal is electrically connected with the winding. Further, the first secondary terminal includes 1 to 5 first sub-secondary terminals, each of which is disposed in parallel with each other between both ends of the first primary coil, and/or, The second secondary terminal includes 1 to 5 second sub-secondary terminals, each of which is disposed in parallel with each other between both ends of the second primary coil. Further, the width of the end of the first primary coil is larger than the width of the end of each of the first sub-secondary terminals, and/or, The width of the end of the second primary coil is larger than the width of the end of each second sub-secondary terminal. Further, the width of the end portion of the first primary coil is 1.2 to 3 times the width of the end portion of