CN112820520B - Electric shielding belt, electric shielding structure applied to coil and manufacturing method of electric shielding structure - Google Patents
Electric shielding belt, electric shielding structure applied to coil and manufacturing method of electric shielding structure Download PDFInfo
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- CN112820520B CN112820520B CN201911116815.5A CN201911116815A CN112820520B CN 112820520 B CN112820520 B CN 112820520B CN 201911116815 A CN201911116815 A CN 201911116815A CN 112820520 B CN112820520 B CN 112820520B
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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
- H01F41/02—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
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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
- H01F41/02—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
- H01F41/064—Winding non-flat conductive wires, e.g. rods, cables or cords
- H01F41/066—Winding non-flat conductive wires, e.g. rods, cables or cords with insulation
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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
- H01F41/02—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
- H01F41/08—Winding conductors onto closed formers or cores, e.g. threading conductors through toroidal cores
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Abstract
The invention discloses an electric shielding tape, which comprises a conductor layer and an insulating layer which are mutually overlapped, wherein the conductor layer and the insulating layer are respectively provided with a front surface and a back surface; the back surface of the conductor layer is symmetrically and fixedly attached to the front surface of the insulating layer, and the electric shielding tape with the bottom surface being the front surface of the conductor layer and the top surface being the back surface of the insulating layer and the back surface being in a layered structure is synthesized; the electric shielding belt is uniformly wound on the winding in a spiral winding mode, and the invention also discloses a manufacturing method of the electric shielding structure applied to the coil. The coil electric shielding structure provided by the invention selects the electric shielding belt synthesized by the winding, the conductor layer and the insulating layer to replace the traditional electric shielding structure needing die sinking, realizes a high-efficiency electric shielding process, reduces parasitic capacitance coupling, greatly reduces the die sinking time and material cost, and can realize the electric shielding processing process of the industry with low price, high efficiency and batch.
Description
Technical Field
The invention relates to the technical field of electromagnetism, in particular to an electric shielding belt, an electric shielding structure applied to a coil and a manufacturing method of the electric shielding belt.
Background
The electric shielding structure applied to the coil has obvious benefits of shielding parasitic parameters and preventing the influence of parasitic parameter coupling between the primary side and the secondary side of the coil on the measurement precision. There are many configurations of the existing electrical shields, such as: 1. the buckling metal shielding boxes or metal shielding shells mostly need special dies, coils with different sizes cannot be used universally, and the buckling metal shielding boxes or metal shielding shells are long in manufacturing time, high in cost and large in occupied volume; 2. the thin-band wound electric shielding structure is only used for a cylindrical coil structure, cannot be used for an annular coil, and is narrow in application range.
Patent application No. CN102033165B, entitled rogowski coil, medium voltage electrical apparatus comprising such a coil and method of providing electrostatic shielding for such a coil, discloses a rogowski coil comprising: a magnetic core (4); a Rogowski coil winding (6) disposed on the core; an insulator (8) provided on the Rogowski coil winding provided on the core; a conductive winding (10) disposed on an insulator disposed on the Rogowski coil winding disposed on the core. The conductive winding includes an electrical connection (14) structured to be Ground (GND). When the conductive winding is grounded, the grounded conductive winding provides electrostatic shielding for the Rogowski coil winding of the Rogowski coil, and in this patent document, the electrical connection and output are both metal wires, which is complex in processing and assembly, low in efficiency, and prone to short-circuit during lamination winding.
Therefore, there is a need for an electrical shielding tape, an electrical shielding structure and a method for manufacturing the same, which are low in cost, simple in manufacturing, applicable to coils of different sizes and types, and high in assembly efficiency, and which do not require mold opening.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the electric shielding belt, the electric shielding structure applied to the coil and the manufacturing method of the electric shielding belt are provided, when the electric shielding operation is realized, the parasitic capacitance coupling is efficiently reduced, the manual winding can be met, the efficiency can be improved in the assembling link by using equipment such as a belt wrapping machine, and the large-scale production and assembly can be realized.
In order to solve the technical problems, the invention is realized by the following technical scheme: an electrical shielding tape comprising a conductor layer and an insulating layer overlying one another, the conductor layer and the insulating layer each having a front face and a back face;
and symmetrically and fixedly attaching the back surface of the conductor layer to the front surface of the insulating layer, and synthesizing the electric shielding tape with the bottom surface being the front surface of the conductor layer and the top surface being the back surface of the insulating layer and in a layered structure.
Further, the width of the insulating layer is larger than that of the conductor layer; the length of the insulating layer is greater than the length of the conductor layer.
Furthermore, the geometric center of the conductor layer coincides with the geometric center of the insulating layer, and the conductor layer and the insulating layer are mutually stuck and fixed.
Further, the conductor layer is a metal tape, and the insulation layer is an insulation tape.
Further, the metal tape is a copper foil tape.
Furthermore, the copper foil tape is made of red copper, and the insulating tape is made of polyvinyl chloride or polyolefin.
The invention also provides an electric shielding structure applied to the coil, which comprises a winding and the electric shielding belt, wherein the winding comprises a magnetic core and at least one turn of enameled wire uniformly wound on the magnetic core;
the electric shielding tape is uniformly wound on the winding in a spiral winding form, wherein the front surface of the conductor layer is contacted with the winding, and the back surface of the insulation layer is far away from the winding.
Furthermore, the magnetic core is an annular iron core with magnetism, and the section of the annular iron core is rectangular.
Furthermore, at least one layer of polyester film adhesive tape is wound on the surface of the annular iron core.
Furthermore, the interior of the enameled wire is made of pure copper materials, and the exterior of the enameled wire is made of insulating materials.
The invention also provides a manufacturing method of the electric shielding structure applied to the coil, which comprises the following steps:
uniformly winding at least one turn of enameled wire on the magnetic core through a winding machine to form a winding;
step two, symmetrically attaching the back of the conductor layer to the front of the insulating layer through the matching of a first winding machine, a second winding machine, a positioning device and a third winding machine, and synthesizing the electric shielding tape with the bottom surface being the front of the conductor layer and the top surface being the back of the insulating layer;
winding at least one layer of polyester film adhesive tape on the surface of the winding formed in the step one by a tape wrapping machine;
step four, uniformly winding the electric shielding tape formed in the step two on the winding in a spiral winding mode with the bottom surface at the lower part and the top surface at the upper part;
and fifthly, fixedly connecting a grounding wire to the tail end of the back surface of the conductor layer, and performing grounding operation through the grounding wire to provide electrostatic shielding for the winding.
Compared with the prior art, the invention has the advantages that:
1. the electric shielding tape provided by the invention is synthesized by symmetrically and fixedly attaching the front side of the conductor layer to the back side of the insulating layer, is not only suitable for a cylindrical coil structure, but also suitable for different types of annular coils with different sizes, and has the advantages of novel structure, flexible implementation, high manufacturing efficiency, small occupied volume and wide application range.
2. According to the electric shielding structure applied to the coil, the electric shielding belt synthesized by the conductor layer and the insulating layer is selected to replace the traditional electric shielding structure needing die sinking, so that a high-efficiency electric shielding process is realized, parasitic capacitance coupling is reduced, the time cost and the material cost of die sinking are greatly reduced, and the electric shielding treatment process in the industry can be completed in a cheap, efficient and batched manner.
3. The manufacturing method applied to the coil electric shielding structure provided by the invention combines the conductor layer and the insulating layer which are respectively provided with the sticky front surface and the non-sticky back surface to form the electric shielding belt, and the electric shielding belt is uniformly wound on the winding in a spiral winding mode that the bottom surface is arranged at the lower part and the top surface is arranged at the upper part, so that the short circuit is avoided when the metal adhesive tape is laminated and wound, the production efficiency is improved, and the operation is simple and convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic view illustrating an assembly of a core and an enamel wire according to the present invention;
FIG. 2 is a schematic cross-sectional view of an electrical shielding structure of the coil of the present invention;
FIG. 3 is a schematic diagram of an assembly of a conductive layer and an insulating layer;
FIG. 4 is a block diagram of an apparatus for processing the electrical shielding tape and the electrical shielding structure;
1. a magnetic core; 2. enameled wires; 3. a conductor layer; 4. an insulating layer; 5. a first winding machine; 6. a second winding machine; 7. a positioning device; 8. and a third winding machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example one
An electrical shielding tape as shown in fig. 2-3, comprising a conductor layer 3 and an insulating layer 4 stacked on top of each other, said conductor layer 3 and insulating layer 4 each having a front side and a back side; in this embodiment, the conductive layer 3 and the insulating layer 4 are both front-side adhesive and back-side non-adhesive, and the conductive layer 3 is a metal tape, more specifically a copper foil tape, and is made of red copper; the insulating layer 4 is an insulating tape and is made of materials such as polyvinyl chloride or polyolefin.
Will the back symmetry of conductor layer 3 adheres to the front of insulating layer 4, and synthetic bottom surface is the front of conductor layer 3, and the top surface is that the back of insulating layer 4 is the laminated structure electric shielding tape, wherein, conductor layer 3 and insulating layer 4 can be respectively from output on the taping machine, and the preparation is accomplished electric shielding tape bottom surface is the viscidity face, the top surface is the non-viscidity face, uses this electric shielding tape not only can be applicable to cylindric coil structure, still can be applicable to the toroidal coil of different size different grade types, novel structure, implements in a flexible way, and the preparation is efficient, occupies smallly, and application scope is extensive.
Preferably, the width of the insulating layer 4 is larger than that of the conductor layer 3, so that the insulating layer 4 can completely cover the back surface of the conductor layer 3; the length of the insulating layer 4 is greater than the length of the conductor layer 3; the geometric center of the conductor layer 3 is the same as that of the insulating layer 4, when the electric shielding belt is manufactured, the initial end and the tail end of the insulating layer 4 are longer than the conductor layer 3 by a section, and the conductor layer 3 made of red copper materials is prevented from being exposed due to the fact that the head end and the tail end are too short when the conductor layer 3 is spirally and uniformly wound on the winding, so that short circuit is avoided.
The electric shielding belt can be formed by compositely winding a first winding machine 5 and a second winding machine 6; and respectively installing reels of the conductor layer coil and the insulating layer coil on a first winding machine 5 and a second winding machine 6, respectively releasing the corresponding conductor layer belt and insulating layer belt, and realizing bonding synthesis and winding at the synthesis part of a third winding machine 8 under the limitation of respective corresponding constraint mechanisms and positioning devices 7, so as to finish the manufacture of the electric shielding belt.
Example two
An electric shielding structure applied to a coil as shown in fig. 1-3 comprises a winding and an electric shielding tape according to the first embodiment, wherein the winding comprises a magnetic core 1 and an enameled wire 2 uniformly wound on the magnetic core 1 by one turn; in this embodiment, the magnetic core 1 is an annular magnetic core, and has a rectangular cross section, and the enameled wire 2 is made of pure copper material inside and insulating material outside.
In another embodiment of the invention, the cross section of the annular core is isosceles trapezoid.
As shown in fig. 2, the electric shield tape is uniformly wound around the winding in a spiral winding form with a bottom surface, i.e., an adhesive surface, on the lower side and a top surface, i.e., a non-adhesive surface, on the upper side, with the front surface of the conductor layer 3 contacting the winding and the back surface of the insulating layer 4 being away from the winding.
Preferably, the surface of the annular iron core is wound with at least one layer of polyester film adhesive tape by a tape wrapping machine before the electric shielding tape is wound, so that the accidental short circuit of the front surfaces of the enameled wire 2 and the conductor layer 3 is effectively avoided.
The specific using process of the electric shielding structure applied to the coil is as follows: firstly, a winding is manufactured, and at least one turn of enameled wire 2 which is made of pure copper and has special insulation treatment on the outside is uniformly wound on the magnetic core 1 through a winding machine to form the winding; then, manufacturing an electric shielding tape, wherein the process of manufacturing the electric shielding tape is the same as that of the first embodiment, and is not described herein again; uniformly winding the electric shielding tape on the winding in a spiral winding mode; and finally, fixedly connecting a grounding wire to the tail end of the back surface of the conductor layer 3, and performing grounding operation through the grounding wire to provide electrostatic shielding for the winding so as to realize the electric shielding function.
EXAMPLE III
An electric shielding structure applied to a coil as shown in fig. 1 to 3 comprises a winding and an electric shielding tape uniformly wound on the winding, wherein,
the winding comprises a magnetic core 1 and a plurality of turns of enameled wires 2 uniformly wound on the magnetic core 1, and the number of turns of the enameled wires 2 is different from that of the enameled wires 2 wound on the magnetic core 1 in the second embodiment, and the specific number of turns is selected according to actual needs; gaps do not exist among the turns of the enameled wires 2;
the electric shielding belt comprises a conductor layer 3 and an insulating layer 4 which are mutually fixed in a hot melting mode, wherein the conductor layer 3 and the insulating layer 4 are provided with a front surface and a back surface;
the back surface of the conductor layer 3 is fixedly adhered to the front surface of the insulating layer 4 through hot melting, the electric shielding tape with the bottom surface being the front surface of the conductor layer 3 and the top surface being the back surface of the insulating layer 4 is synthesized, and the electric shielding tape is uniformly wound on the winding in a spiral winding mode with the bottom surface at the bottom and the top surface at the top; the specific use process and principle are the same as those of the embodiment.
Example four
As shown in fig. 1 to 4, the present invention further provides a method for manufacturing an electric shielding structure applied to a coil on the basis of the second embodiment or the third embodiment, including the following steps:
step one, uniformly winding at least one turn of enameled wire 2 which is made of pure copper and has special insulation treatment on the outside on the magnetic core 1 through a winding machine to form windings, wherein the number of the windings is not limited;
step two, symmetrically attaching the back of the conductor layer 3 to the front of the insulating layer 4 through the matching of a first winding machine 5, a second winding machine 6, a positioning device 7 and a third winding machine 8, and synthesizing the electric shielding tape with the bottom surface being the front of the conductor layer 3 and the top surface being the back of the insulating layer 4;
winding at least one layer of polyester film adhesive tape on the surface of the winding formed in the step one through a tape wrapping machine, so that the condition that the front sides of the enameled wire 2 and the conductor layer 3 are short-circuited accidentally is effectively avoided;
step four, uniformly winding the electric shielding tape formed in the step two on the winding in a spiral winding mode that the bottom surface, namely the viscous surface, is arranged at the lower part, and the top surface, namely the non-viscous surface, is arranged at the upper part;
and step five, fixedly connecting a grounding wire to the tail end of the back surface of the conductor layer 3, and performing grounding operation through the grounding wire to provide electrostatic shielding for the winding.
This embodiment forms electric shielding area and spiral winding to the winding through all having the conductor layer and the insulating layer combination that take sticky front and non-sticky back, can not the short circuit when both having ensured conductor layer lamination winding, has also improved production efficiency, and easy operation is convenient.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.
Claims (9)
1. An electrical shielding tape characterized by: the conductive layer (3) and the insulating layer (4) are mutually overlapped, and the conductive layer (3) and the insulating layer (4) are provided with a front surface and a back surface;
symmetrically and fixedly attaching the back surface of the conductor layer (3) to the front surface of the insulating layer (4), and synthesizing the electric shielding tape with the bottom surface being the front surface of the conductor layer (3) and the top surface being the back surface of the insulating layer (4) and in a layered structure;
the width of the insulating layer (4) is greater than the width of the conductor layer (3); the length of the insulating layer (4) is greater than the length of the conductor layer (3);
the conductor layer and the insulating layer are both sticky on the front surface and non-sticky on the back surface;
the tail end of the back face of the conductor layer is fixedly connected with a grounding wire and is grounded through the grounding wire, so that electrostatic shielding is provided for the winding; when the electric shielding operation is realized, the parasitic capacitance coupling is efficiently reduced, the manual winding can be met, the efficiency can be improved in the assembly link by using equipment such as a tape wrapping machine, and the large-scale production and assembly can be realized;
the electric shielding belt is formed by compositely winding through a first winding machine and a second winding machine; respectively installing reels of the conductor layer coil and the insulating layer coil on a first winding machine and a second winding machine, respectively releasing the corresponding conductor layer belt and insulating layer belt, and realizing bonding synthesis and winding at the synthesis position of a third winding machine under the limitation of respective corresponding constraint mechanisms and positioning devices; and winding at least one layer of polyester film adhesive tape on the surface of the winding by a tape wrapping machine.
2. An electrical shielding tape according to claim 1, wherein: the geometric center of the conductor layer (3) coincides with the geometric center of the insulating layer (4), and the conductor layer (3) and the insulating layer (4) are mutually pasted and fixed.
3. An electrical shielding tape according to claim 2, wherein: the conductor layer (3) is a metal adhesive tape, and the insulating layer (4) is an insulating adhesive tape.
4. An electrical shielding tape according to claim 3, wherein: the metal adhesive tape is a copper foil adhesive tape.
5. An electrical shielding tape according to claim 4, wherein: the copper foil tape is made of red copper, and the insulating tape is made of polyvinyl chloride or polyolefin.
6. An electric shielding structure applied to a coil is characterized in that: -an electrical shielding tape according to any of claims 1 to 5, comprising a winding comprising a magnetic core (1) and at least one turn of enamelled wire (2) uniformly wound around said magnetic core (1);
the electric shielding tape is uniformly wound on the winding in a spiral winding form, wherein the front surface of the conductor layer (3) is contacted with the winding, and the back surface of the insulation layer (4) is far away from the winding.
7. An electric shielding structure applied to a coil according to claim 6, wherein: the magnetic core (1) is a magnetic annular iron core, and the section of the annular iron core is rectangular.
8. An electric shielding structure applied to a coil according to claim 7, wherein: at least one layer of polyester film adhesive tape is wound on the surface of the annular iron core.
9. A method for manufacturing an electric shielding structure applied to a coil, wherein the electric shielding tape of claim 1 is used, comprising the steps of:
uniformly winding at least one turn of enameled wire (2) on a magnetic core (1) through a winding machine to form a winding;
step two, symmetrically attaching the back of the conductor layer (3) to the front of the insulating layer (4) through the matching of a first winding machine (5), a second winding machine (6), a positioning device (7) and a third winding machine (8), and synthesizing the electric shielding tape with the bottom surface being the front of the conductor layer (3) and the top surface being the back of the insulating layer (4);
winding at least one layer of polyester film adhesive tape on the surface of the winding formed in the step one by a tape wrapping machine;
step four, uniformly winding the electric shielding tape formed in the step two on the winding in a spiral winding mode with the bottom surface at the lower part and the top surface at the upper part;
and fifthly, fixedly connecting a grounding wire to the tail end of the back surface of the conductor layer (3) and performing grounding operation through the grounding wire to provide electrostatic shielding for the winding.
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| CN201911116815.5A CN112820520B (en) | 2019-11-15 | 2019-11-15 | Electric shielding belt, electric shielding structure applied to coil and manufacturing method of electric shielding structure |
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| CN201911116815.5A CN112820520B (en) | 2019-11-15 | 2019-11-15 | Electric shielding belt, electric shielding structure applied to coil and manufacturing method of electric shielding structure |
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| JPH0645162A (en) * | 1992-07-21 | 1994-02-18 | I Kiyuu For:Kk | Noiseless transformer |
| CN101630588A (en) * | 2009-07-01 | 2010-01-20 | 刘清伟 | Automatic glue welding method and device of copper foil |
| CN102033165A (en) * | 2009-08-20 | 2011-04-27 | 伊顿公司 | Rogowski coil, medium voltage electrical apparatus including the same, and method of providing electrostatic shielding for a rogowski coil |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2084647U (en) * | 1991-04-13 | 1991-09-11 | 沈阳变压器研究所 | Foil winding machine |
| CN103630704B (en) * | 2013-11-27 | 2015-06-24 | 大连理工大学 | Continuous resistance wire probe and making method thereof |
| CN204390867U (en) * | 2014-11-03 | 2015-06-10 | 苏州悦煌电子有限公司 | A kind of high frequency transformer |
| CN204792370U (en) * | 2015-07-10 | 2015-11-18 | 珠海拓锐德电子科技有限公司 | Toroidal transformer |
| CN105390269A (en) * | 2015-11-24 | 2016-03-09 | 宜兴市兴益特种变压器有限公司 | Dual-layer split-body simultaneous-winding foil winding machine |
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2019
- 2019-11-15 CN CN201911116815.5A patent/CN112820520B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0645162A (en) * | 1992-07-21 | 1994-02-18 | I Kiyuu For:Kk | Noiseless transformer |
| CN101630588A (en) * | 2009-07-01 | 2010-01-20 | 刘清伟 | Automatic glue welding method and device of copper foil |
| CN102033165A (en) * | 2009-08-20 | 2011-04-27 | 伊顿公司 | Rogowski coil, medium voltage electrical apparatus including the same, and method of providing electrostatic shielding for a rogowski coil |
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