CN210296101U

CN210296101U - SMD large current isolation current transformer

Info

Publication number: CN210296101U
Application number: CN201921082949.5U
Authority: CN
Inventors: 聂柳荣; 王宁; 王洪友
Original assignee: Dongguan Pulse Electronics Co Ltd
Current assignee: Dongguan Pulse Electronics Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-04-10
Anticipated expiration: 2029-07-11

Abstract

The utility model discloses a SMD large current isolation current transformer, which comprises a first framework, a second framework, a first secondary winding and a primary winding; the first framework comprises a first seat body and a first barrel which are integrally formed and connected, and the first seat body is provided with first pins; the second framework comprises a second seat body and a second barrel which are integrally connected, and second pins are arranged on the second seat body; the first secondary winding is wound on the outer surface of the first cylinder, and corresponding first pins are in conduction connection; the primary winding is a copper foil, is fixed in the second cylinder in an embedding forming mode through an injection molding mode, and is connected with the second pin in a conduction mode. The copper foil is used as a primary winding and is fixed in the second cylinder body in an embedding and forming mode in an injection molding mode, so that the high-current power transformer can bear 100A high current, does not need winding, is high in structural precision and simple and convenient to manufacture, meets the IEC61558 reinforcing insulation requirement, and improves the electrical performance of the whole product.

Description

SMD large current isolation current transformer

Technical Field

The utility model relates to a current transformer field technique especially indicates a SMD heavy current isolation current transformer.

Background

The current transformer is an instrument for converting a large primary side current into a small secondary side current according to the electromagnetic induction principle to measure, and comprises a framework, a secondary winding and a primary winding; the existing isolation current transformer is made of a common standard framework, so that the isolation current transformer can only be used in occasions with low primary current, the current is too large, the isolation current transformer is not wound well by using copper foil or a stranded wire winding, and in addition, the insulation strength is relatively low. Further improvements to existing isolated current transformer structures are needed.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model discloses to the disappearance that prior art exists, its main objective provides a SMD heavy current isolation current transformer, and it can effectively be used in the lower occasion of elementary current to solve current transformer, and low and electric current of dielectric strength is too big, no matter with the copper foil or at the problem of the all good coiling of strand winding.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an SMD large-current isolation current transformer comprises a first framework, a second framework, a first secondary winding and a primary winding; the first framework comprises a first seat body and a first barrel which are integrally formed and connected, and the first seat body is provided with first pins; the second framework comprises a second seat body and a second cylinder body which are integrally connected, the second seat body is provided with second pins, and the second cylinder body and the first cylinder body are mutually nested together; the first secondary winding is a conducting wire and is wound on the outer surface of the first barrel, and the first secondary winding is in conductive connection with the corresponding first pin; the primary winding is a copper foil, the copper foil is embedded and molded and fixed in the second cylinder body in an injection molding mode, and the primary winding is connected with the second pin in a conduction mode.

Preferably, the number of the first pins is four, and the first pins all extend in parallel with the axial direction of the first barrel.

Preferably, the number of the second pins is two, and the two second pins extend in parallel with the axial direction of the second cylinder.

Preferably, the outer surface of the first secondary winding is coated with a first insulating tape.

As a preferred scheme, the second cylinder body is sleeved outside the first cylinder body.

As a preferable scheme, a second secondary winding is wound on the outer surface of the second cylinder, and the second secondary winding is in conductive connection with the corresponding first pin.

Preferably, the outer surface of the second secondary winding is coated with a second insulating tape.

Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme:

the copper foil is used as a primary winding, and the primary winding is fixed in the second cylinder body in an injection molding mode in an embedded mode, so that the 100A high current can be borne, the high primary current can be used in occasions, winding is not needed, the structure precision is high, the consistency is good, the manufacturing is simple and convenient, the processing cost is reduced, meanwhile, the insulating strength is high, the IEC61558 reinforcing and insulating requirements are met, and the electrical performance of the whole product is improved.

Second, through the surface with first secondary winding at first barrel, primary winding is fixed at the second barrel through the mode insert molding of moulding plastics to the cooperation is with the surface of second secondary winding at the second barrel, with the structure that forms sandwich, the effectual leakage inductance that has reduced eliminates because the error that the leakage inductance arouses.

To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a schematic perspective view of a preferred embodiment of the present invention;

FIG. 2 is an exploded view of the preferred embodiment of the present invention;

fig. 3 is a cross-sectional view of a preferred embodiment of the present invention.

The attached drawings indicate the following:

10. first framework 11 and first base

12. First cylinder 20 and second frame

21. Second seat 22 and second cylinder

30. First secondary winding 40, primary winding

51. First pin 52 and second pin

53. First insulating tape 54, second insulating tape

55. First magnetic core 56, second magnetic core

60. A second secondary winding.

Detailed Description

Referring to fig. 1 to 3, a specific structure of a preferred embodiment of the present invention is shown, which includes a first bobbin 10, a second bobbin 20, a first secondary winding 30 and a primary winding 40.

This first skeleton 10 is provided with first stitch 51 including the first pedestal 11 and the first barrel 12 that integrated into one piece connects on the first pedestal 11, and in this embodiment, first stitch 51 is four, and it all extends with the axial direction parallel of first barrel 12.

The second framework 20 comprises a second seat 21 and a second cylinder 22 which are integrally connected, the second seat 21 is provided with a second pin 52, and the second cylinder 22 and the first cylinder 12 are mutually nested together; in this embodiment, the second cylinder 22 is sleeved outside the first cylinder 12, and the number of the second pins 52 is two, and both the second pins extend parallel to the axial direction of the second cylinder 22.

The first secondary winding 30 is a wire, which is wound on the outer surface of the first barrel 12, and the first secondary winding 30 is conductively connected with the corresponding first pin 51; in the present embodiment, the first secondary winding 30 is sandwiched between the outer wall of the first cylinder 12 and the inner wall of the second cylinder 22, and the outer surface of the first secondary winding 30 is covered with the first insulating tape 53.

The primary winding 40 is made of copper foil, and is fixed in the second cylinder 22 by means of insert molding in an injection molding manner, and the primary winding 40 is connected with the second pin 52 in a conduction manner.

In the present embodiment, the second secondary winding 60 is wound on the outer surface of the second cylinder 22, and the second secondary winding 60 is electrically connected to the corresponding first pin 51; in this embodiment, the outer surface of the second secondary winding 60 is further coated with a second insulating tape 54.

The magnetic core further includes a first magnetic core 55 and a second magnetic core 56, the first magnetic core 55 and the second magnetic core 56 are arranged in parallel, and the first cylindrical body 12 and the second cylindrical body 22 are sandwiched between the first magnetic core 55 and the second magnetic core 56 and are covered with the first magnetic core 55 and the second magnetic core 56.

Detailed description the manufacturing process of this embodiment is as follows:

firstly, winding a first secondary winding 30 on the outer surface of a first cylinder 12, enabling the first secondary winding 30 to be in conductive connection with a corresponding first pin 51, and then coating a first insulating tape 53 on the outer surface of the first secondary winding 30 to manufacture a first semi-finished product; then, when the second framework 20 is manufactured, the primary winding 40 is fixed in the second cylinder 22 in an injection molding mode, the primary winding 40 is connected with the second pin 52 in a conduction mode, then the second secondary winding 60 is wound on the outer surface of the second cylinder 22, and then the second insulating colloid 54 is coated on the outer surface of the second secondary winding 60 to manufacture a second semi-finished product; then, the second cylinder 22 is sleeved outside the first cylinder 12, so that the two semi-finished products are assembled together, the second secondary winding 60 is connected with the corresponding first pin 51 in a conduction manner, and finally, the first magnetic core 55 and the second magnetic core 56 are assembled, so that the first cylinder 12 and the second cylinder 22 are covered by the first magnetic core 55 and the second magnetic core 56.

The utility model discloses a design focus lies in: firstly, the copper foil is used as the primary winding and is matched with the primary winding to be fixed in the second cylinder body in an injection molding mode, so that the high-current transformer can bear 100A high current, can be used in occasions with high primary current, does not need winding, and has high structural precision, good consistency and simple and convenient manufacture, thereby reducing the processing cost, simultaneously having high insulating strength, meeting the IEC61558 reinforcing and insulating requirements and improving the electrical performance of the whole product. Secondly, through the surface of winding first secondary winding at first barrel, primary winding is fixed at the second barrel through the mode of moulding plastics insert the shaping to the cooperation is with the surface of second secondary winding at the second barrel, with the structure of formation sandwich formula, the effectual leakage inductance that has reduced eliminates because the error that the leakage inductance arouses.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a SMD heavy current isolation current transformer which characterized in that: the transformer comprises a first framework, a second framework, a first secondary winding and a primary winding; the first framework comprises a first seat body and a first barrel which are integrally formed and connected, and the first seat body is provided with first pins; the second framework comprises a second seat body and a second cylinder body which are integrally connected, the second seat body is provided with second pins, and the second cylinder body and the first cylinder body are mutually nested together; the first secondary winding is a conducting wire and is wound on the outer surface of the first barrel, and the first secondary winding is in conductive connection with the corresponding first pin; the primary winding is a copper foil, the copper foil is embedded and molded and fixed in the second cylinder body in an injection molding mode, and the primary winding is connected with the second pin in a conduction mode.

2. The SMD high current isolating current transformer as claimed in claim 1, wherein: the first stitch is four, and the first stitch and the axial direction of the first barrel extend in parallel.

3. The SMD high current isolating current transformer as claimed in claim 1, wherein: the second stitch is two, and it all extends with the axial direction parallel of second barrel.

4. The SMD high current isolating current transformer as claimed in claim 1, wherein: the outer surface of the first secondary winding is coated with a first insulating adhesive tape.

5. The SMD high current isolating current transformer as claimed in claim 1, wherein: the second cylinder body is sleeved outside the first cylinder body.

6. The SMD high current isolating current transformer as claimed in claim 1, wherein: and a second secondary winding is wound on the outer surface of the second cylinder and is in conductive connection with the corresponding first pin.

7. The SMD large current isolating current transformer as claimed in claim 6, wherein: and the outer surface of the second secondary winding is coated with second insulating glue.