CN217134125U

CN217134125U - Surface-mounted network transformer structure

Info

Publication number: CN217134125U
Application number: CN202220447252.9U
Authority: CN
Inventors: 吴天强; 张峰平; 张大伟; 张超; 杨静
Original assignee: CETC 9 Research Institute
Current assignee: CETC 9 Research Institute
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-08-05
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a surface mounting type network transformer structure, including encapsulation shell, magnetic core and winding, the encapsulation shell includes the open casing of one end and PCB board, and the terminal surface of uncovered department is the rectangle cyclic annular, is equipped with the several pad on it, and the pad comprises upper step and lower step, and the lower step is located the metallization cladding material intercommunication that the surface set up through the upper and lower step of the inboard just same pad of upper step, and the lead-out wire welding of winding is on the metallization cladding material of lower step department, and the PCB board welding is on the metallization cladding material of upper step. The utility model discloses it is good with PCB looks welded step up roughness, can reduce the transformer greatly when reflow soldering, some pins appear and weld on, some pins do not weld the circumstances, have increased the reliability of product. The lead-out wire is the enameled wire, when carrying out reflow soldering, reduces the risk that the enameled wire dropped greatly, has improved the stability that winding and casing are connected, and the enameled wire need not go the lacquer and handle, the effectual processing cost of manufacture that has reduced.

Description

Surface-mounted network transformer structure

Technical Field

The utility model relates to a table pastes formula network transformer especially relates to a table pastes formula network transformer structure.

Background

Network transformers are an indispensable important component in communication devices. The device is mainly applied to network switches, routers, servers, network cards, hubs, ADSL (asymmetrical digital subscriber line), VDSL (very high-voltage digital subscriber line) digital equipment, EOC (Ethernet over coax) terminals, network set-top boxes, smart televisions, network cameras, mainboards and other equipment, and plays roles in signal coupling, impedance matching, waveform restoration, signal clutter control, high-voltage isolation and the like. The network transformer in the ethernet device has the following functions: firstly, transmitting data, namely transmitting a signal transmitted from a data line end to an equipment IC end in a coupling mode; secondly, high-voltage isolation is carried out, so that the IC end of the equipment is isolated from the outside, the equipment IC is prevented from being damaged by surge or thunder, and the anti-interference capability is enhanced; voltage matching, namely, the levels transmitted from the data line ends are different, and the levels are isolated by using a network transformer without influencing equipment ICs (integrated circuits); and fourthly, signal clutter is suppressed, and a common mode choke in the network transformer can filter clutter common mode signals and improve signal quality.

Because network equipment needs more miniaturized, modularization and high-quality installation components, a network transformer is used as a key component and tends to develop towards miniaturization, and the patch type network transformer is small in size and can greatly reduce the installation size compared with a direct insertion type network transformer.

In the traditional surface mount type network transformer, an enameled wire is directly soldered on a pad pin, the flatness of each pin of the transformer is poor, the enameled wire may fall off when reflow soldering is carried out, and the condition of missing soldering can occur due to uneven pin surfaces; in order to prevent the enameled wire from falling off during welding, an electronic spot welding machine is used for spot welding in a soldering mode, but before soldering, the enamel skin needs to be manually removed completely, the efficiency is low, the quality is difficult to guarantee, and the condition that the welding pad is not welded due to the fact that the pins are not flat exists. Therefore, how to improve the packaging structure of the surface-mounted network transformer makes the network transformer suitable for the reflow soldering SMT process, and the conditions that the enameled wire falls off and the pin is not welded are avoided, so that the packaging structure has very important significance.

Disclosure of Invention

An object of the utility model is to provide a solve above-mentioned problem, can not appear that the enameled wire drops and the pin does not weld the first-class condition, a table pastes formula network transformer structure.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a surface mounting type network transformer structure, includes the encapsulation shell, is located magnetic core and the winding of encapsulation shell, the encapsulation shell includes the open casing of one end and PCB board, the terminal surface of the uncovered department of casing is the rectangle cyclic annular, is equipped with the several pad on it, and the terminal surface of uncovered department divide into coaxial inner ring and outer loop, the pad comprises the second grade step form by last step and lower step, and wherein the lower step is located the inner ring, and the upper step is located the outer loop, and the metallization cladding material intercommunication that the surface set up is passed through to the last step of same pad, lower step, and the lead-out wire welding of winding is on the metallization cladding material of lower step department, and the PCB board welding is on the metallization cladding material of last step.

Preferably, the method comprises the following steps: the lead-out wire is connected with the lower step through an electronic spot welding machine in a spot welding mode, and the PCB is welded with the upper step through reflow soldering.

Preferably, the method comprises the following steps: the outgoing line is an enameled wire.

Compared with the prior art, the utility model has the advantages of:

1. compared with the traditional surface-mounted network transformer packaging shell, the structure has the advantages that the flatness of the upper step of the shell welded with the PCB is good, the number of pins welded is greatly reduced when the transformer uses a reflow soldering process, the number of pins not welded is reduced, and the use reliability of the transformer is greatly improved.

2. The lead-out wire of winding and casing lower step pass through electron spot welder spot welding and connect, make when carrying out reflow soldering, reduce the risk that the enameled wire dropped greatly, have increased the connection stability of winding and encapsulation shell.

3. The utility model discloses technical scheme processing method is simple, and the structural consistency is stronger, and the enameled wire that the winding was drawn forth also need not go on the depainting and handle, the effectual processing cost of manufacture that has reduced.

Drawings

Fig. 1 is a perspective view of a middle housing of the present invention;

FIG. 2 is a front view of the present invention without a PCB board;

fig. 3 is a front view of the middle housing of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

fig. 5 is a schematic view of the position of the case and the PCB board of fig. 4 when being soldered.

In the figure: 1. a magnetic core; 2. a winding; 3. a housing; 4. an outgoing line; 5. descending a step; 6. an upper step; 7. a metallized coating; 8. and (7) a PCB board.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Example 1: referring to fig. 1-5, a surface-mounted network transformer structure includes a package housing, a magnetic core 1 and a winding 2, the magnetic core 1 and the winding 2 are located in the package housing, the package housing includes a casing 3 with an open end and a PCB 8, the end face of the casing 3 is rectangular ring-shaped, a plurality of pads are arranged on the end face, the end face of the open end is divided into an inner ring and an outer ring which are coaxial, the pads form a second-stage step by an upper step 6 and a lower step 5, the lower step 5 is located in the inner ring, the upper step 6 is located in the outer ring, the upper step 6 and the lower step 5 of the same pad are communicated through a metallization coating 7 arranged on the surface, an outgoing line 4 of the winding 2 is welded on the metallization coating 7 of the lower step 5, and the PCB 8 is welded on the metallization coating 7 of the upper step 6.

The lead-out wire 4 is connected with the lower step 5 through an electronic spot welding machine in a spot welding mode, and the PCB 8 is welded with the upper step 6 through reflow soldering. The outgoing line 4 is an enameled wire.

The surface-mounted network transformer packaging structure adopting the stepped structure is innovative, the upper step 6 is used for welding the PCB 8, the lower step 5 is used for welding the outgoing line 4 of the winding 2, the welding positions of the PCB 8 and the outgoing line 4 are different and have height difference, mutual influence cannot be caused during welding, the height difference exists when the outgoing line 4 is welded on the lower step 5 in time, and the flatness of the upper step 6 cannot be influenced. The upper step 6 and the lower step 5 are communicated through the metallization coating 7, and the PCB 8 and the winding 2 can be well communicated.

The upper step 6 is used for being welded with the PCB 8, and during reflow soldering, the situation that some pins are welded and some pins are not welded can be avoided; the lower step 5 is used for being welded with the enameled wire in a spot welding mode, and the enameled wire cannot fall off during reflow welding. This greatly increases the reliability of the use of the network transformer. And the network transformer produced in this way has good consistency.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a surface-mounted network transformer structure, includes the encapsulation shell, is located magnetic core and the winding of encapsulation shell, the encapsulation shell includes the open casing of one end and PCB board, the terminal surface of the uncovered department of casing is the rectangle cyclic annular, is equipped with several pad, its characterized in that on it: the end face of the opening is divided into an inner ring and an outer ring which are coaxial, the pad is in a secondary step shape formed by an upper step and a lower step, the lower step is located in the inner ring, the upper step is located in the outer ring, the upper step and the lower step of the same pad are communicated through a metalized coating arranged on the surface, a lead-out wire of a winding is welded on the metalized coating at the lower step, and the PCB is welded on the metalized coating at the upper step.

2. A surface-mount network transformer structure according to claim 1, characterized in that: the lead-out wire is connected with the lower step through an electronic spot welding machine in a spot welding mode, and the PCB is welded with the upper step through reflow soldering.

3. A surface-mount network transformer structure according to claim 1, characterized in that: the outgoing line is an enameled wire.