CN110942894A - Current transformer with novel structure and manufacturing method - Google Patents
Current transformer with novel structure and manufacturing method Download PDFInfo
- Publication number
- CN110942894A CN110942894A CN201911348192.4A CN201911348192A CN110942894A CN 110942894 A CN110942894 A CN 110942894A CN 201911348192 A CN201911348192 A CN 201911348192A CN 110942894 A CN110942894 A CN 110942894A
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- China
- Prior art keywords
- shell
- side winding
- secondary side
- hollow cylinder
- hole
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H01F27/02—Casings
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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
- H01F27/28—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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a current transformer with a novel structure and a manufacturing method thereof, and the current transformer comprises a shell, a magnetic ring, a primary side winding, a secondary side winding, a potting material and a fixing adhesive, wherein the shell is an annular body with a hollow cylinder arranged at the center position inside and a square shell outside, a through hole is arranged in one side wall of the upper end surface of the shell, the hollow cylinder is connected with the through hole through a long circular groove on the top end surface of the shell, three protruding pins are arranged at the bottom end of the shell, the secondary side winding is uniformly wound on the magnetic ring and horizontally arranged in the annular body inside the shell, the start and tail ends of the secondary side winding are respectively connected on the two pins on the shell, the primary side winding is inserted into the hollow cylinder and the through hole from the top end of the shell. The effect is small, easy operation, simple to operate satisfy the ann rule requirement, utilizes the novel structure of shell to keep apart primary side winding and secondary side winding to carry out the embedment to the secondary side winding, guaranteed that two windings are withstand voltage and creepage distance between.
Description
Technical Field
The invention relates to a current transformer, in particular to a current transformer with a novel structure and a winding method.
Background
The current transformer is composed of a closed iron core and a winding according to the principle of electromagnetic induction. The primary side winding of the transformer has few turns and is connected in series in a circuit of current to be measured, so that the transformer usually has all current of the circuit flowing through, and the secondary side winding has more turns and is connected in series in a measuring instrument and a protection circuit. In a high-frequency switching power supply, it is necessary to detect the current of components such as a switching tube and an inductor. The current transformer has the advantages of low energy consumption, wide frequency band, good signal reducibility, low price, isolation of control and main power circuits and the like, so the current transformer is well applied to a switching power supply and is often used as a current detection method. The switching power supply needs to meet the requirements of safety regulations, so that the primary side and the secondary side of a current transformer in the switching power supply need to meet certain creepage distance and higher voltage withstanding requirements, and the conventional structure is difficult to meet the requirements of larger creepage distance and higher voltage withstanding.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a current transformer with a novel structure and a manufacturing method thereof, and the specific technical scheme is that the current transformer with the novel structure comprises a shell, a magnetic ring, a primary side winding, a secondary side winding, a potting material and a fixing adhesive, and is characterized in that: the shell is an annular body with a hollow cylinder in the center and a square shell outside, a through hole is formed in one side wall of the upper end face of the shell, the hollow cylinder is connected with the through hole through a long circular groove in the top end face of the shell, the diameters of the hollow cylinder, the through hole and the groove are slightly larger than the outer diameter of the primary side winding, and three protruding pins are arranged at the bottom end of the shell.
The manufacturing method comprises the following steps of (I) uniformly winding a secondary side winding on a magnetic ring; secondly, tin ironing and measuring the coil of the start and tail of the secondary side winding; thirdly, the qualified wound magnetic ring is horizontally arranged in an annular body in the shell; fourthly, respectively connecting the start and tail ends of the secondary side winding to two pins on the shell; filling and sealing the annular body of the shell by using a filling and sealing material, and curing; inserting the primary side winding into the hollow cylinder and the through hole from the top end of the shell; fixing the primary side winding and the groove together by fixing glue; and (eighthly), finally carrying out factory inspection, and carrying out performance and appearance inspection, wherein the product is qualified when the requirements are met.
The novel structure of the shell is utilized to isolate the primary side winding from the secondary side winding, the secondary side winding is encapsulated, the encapsulation material increases the insulation of the primary side winding and the secondary side winding, the creepage distance between the primary side winding and the secondary side winding is ensured, the voltage resistance of the primary side winding and the secondary side winding is enhanced, and the novel structure is convenient to install, small in size and easy to meet safety requirements.
Drawings
FIG. 1 is a structural cross-sectional view of the present invention;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a bottom perspective view of the housing of the present invention;
fig. 4 is a top perspective view of the housing of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
Example 1
As shown in fig. 1 to 4, a current transformer with a novel structure comprises a housing 1, a magnetic ring 2, a primary side winding 3, a secondary side winding 4, a potting material 5 and a fixing glue 6, wherein the housing 1 is an annular body with a hollow cylinder 1-1 at the center position inside and a square housing outside, a through hole 1-2 is formed in one side wall of the upper end surface of the housing 1, the hollow cylinder 1-1 is connected with the through hole 1-2 through a long circular groove 1-3 on the top end surface of the housing 1, the diameters of the hollow cylinder 1-1, the through hole 1-2 and the groove 1-3 are slightly larger than the outer diameter of the primary side winding 3, and three protruded pins 1-4 are arranged at the bottom end of the housing 1.
Example one
Taking a current transformer D12.7-49 as an example, a primary side winding 3 is a phi 1.2mm tinned copper wire, a secondary side winding 4 is a phi 0.2 polyurethane enameled wire, firstly, the phi 0.2 polyurethane enameled wire is uniformly wound on a magnetic ring 2 for 100 circles to serve as the secondary side winding 4, then, the starting end and the tail end of the secondary side winding are subjected to tin ironing treatment, after the treatment, the tin ironing and circle number testing is carried out, the secondary side winding is horizontally arranged in an annular body in a shell 1, the starting end and the tail end of the secondary side winding 4 are connected to two different pins 1-4 of the shell 1, the annular body of the shell 1 is encapsulated and solidified by an encapsulating material 5, after the encapsulation and solidification, the phi 1.2mm tinned copper wire of the primary side winding 3 is inserted into a hollow cylinder 1-1 and a through hole 1-2 reserved on the shell 1 and extends out of the through hole, is fixed in a groove 1-3 by fixing glue 6 and dried, and (4) carrying out processes of tin ironing twice, labeling, rechecking and the like, and finally carrying out factory inspection, and inspecting the performance and the appearance, wherein the product is qualified when the requirements are met.
Claims (2)
1. The utility model provides a current transformer of novel structure, includes shell (1), magnetic ring (2), primary side winding (3), secondary side winding (4), potting material (5), solid fixed glue (6), its characterized in that: the magnetic ring is characterized in that the shell (1) is an annular body with a hollow cylinder (1-1) in the center and a square shell outside, a through hole (1-2) is formed in one side wall of the upper end face of the shell (1), the hollow cylinder (1-1) is connected with the through hole (1-2) through a long circular groove (1-3) on the top end face of the shell (1), the diameters of the hollow cylinder (1-1), the through hole (1-2) and the groove (1-3) are slightly larger than the outer diameter of the primary side winding (3), three protruding pins (1-4) are arranged at the bottom end of the shell (1), the secondary side winding (4) is uniformly wound on the magnetic ring (2) and horizontally arranged in the annular body in the shell (1),
the start and tail ends of the secondary side winding (4) are respectively connected to two pins (1-4) on the shell (1), the primary side winding (3) is inserted into the hollow cylinder (1-1) and the through hole (1-2) from the top end of the shell (1), and the primary side winding (3) and the groove (1-3) are fixed together by fixing glue (6).
2. The method for manufacturing the current transformer with the novel structure according to claim 1, is characterized in that: the preparation method comprises the following steps of,
uniformly winding a secondary side winding (4) on a magnetic ring (2);
secondly, tin ironing and measuring the coil of the start and the tail of the secondary side winding (4);
thirdly, the qualified wound magnetic ring (2) is horizontally arranged in an annular body in the shell (1);
fourthly, the start and the tail of the secondary side winding (4) are respectively connected to two pins (1-4) on the shell (1);
fifthly, encapsulating and curing the annular body of the shell (1) by using an encapsulating material (5);
inserting the primary side winding (3) into the hollow cylinder (1-1) and the through hole (1-2) from the top end of the shell (1);
fixing the primary side winding (3) and the grooves (1-3) together by using fixing glue (6);
and (eighthly), finally carrying out factory inspection, and carrying out performance and appearance inspection, wherein the product is qualified when the requirements are met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348192.4A CN110942894A (en) | 2019-12-24 | 2019-12-24 | Current transformer with novel structure and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348192.4A CN110942894A (en) | 2019-12-24 | 2019-12-24 | Current transformer with novel structure and manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110942894A true CN110942894A (en) | 2020-03-31 |
Family
ID=69912059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911348192.4A Withdrawn CN110942894A (en) | 2019-12-24 | 2019-12-24 | Current transformer with novel structure and manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110942894A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611475A (en) * | 2021-06-11 | 2021-11-05 | 上海大一互电力电器有限公司 | Polyurethane encapsulation type current transformer and production equipment and method |
-
2019
- 2019-12-24 CN CN201911348192.4A patent/CN110942894A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611475A (en) * | 2021-06-11 | 2021-11-05 | 上海大一互电力电器有限公司 | Polyurethane encapsulation type current transformer and production equipment and method |
| CN113611475B (en) * | 2021-06-11 | 2024-06-04 | 上海大一互电力电器有限公司 | Polyurethane encapsulated type current transformer and production equipment and method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200331 |