CN207425595U - A Network Transformer Structure - Google Patents

Abstract

The utility model discloses a network transformer structure, through the new design of structure to the magnetic core, has three book core portion on making a plurality of I-shaped magnetic cores of integral type, wherein first book core portion and second roll up the core portion and be used for coiling transformer coil, and the third rolls up core portion and is used for coiling common mode choke coil to, make transformer and common mode choke merge on a magnetic core, can replace two magnetic cores in the past, save the cost, save the space of circuit board.

Description

A Network Transformer Structure

technical field

The utility model relates to the technology in the field of magnetic cores, in particular to a network transformer structure.

Background technique

For the prior art related to the present utility model, please refer to the Chinese Patent Application No. CN106160696A published on November 23, 2016, which discloses a network filter module including a wire-wound toroidal transformer and a wire-wound toroidal common mode choke, wherein Both the transformer and the common mode choke coil have their own independent magnetic core structure, which leads to inconvenient winding during production, many assembly steps, high production cost, and the separation of the two magnetic cores will occupy more space on the circuit board.

Utility model content

In view of this, the utility model aims at the lack of the existing technology, and its main purpose is to provide a network transformer structure, so that the transformer and the common mode choke coil are combined on one magnetic core, which can replace the previous two magnetic cores, saving cost and save board space.

In order to achieve the above object, the utility model adopts the following technical solutions:

A network transformer structure comprising

Magnetic core module, the magnetic core module includes a flat magnetic core and a plurality of integrated I-shaped magnetic cores, the plurality of I-shaped magnetic cores are installed on the flat magnetic core, including a first flange, a transformer isolation column, the second flange, and the third flange, there are pads A and E on both sides of the top of the first flange, and pads B and F on both sides of the top of the transformer barrier. There are pads C and G on both sides of the top of the second flange, pads D and H on both sides of the top of the third flange, and between the first flange and the transformer barrier. a first roll core, a second roll core is provided between the transformer barrier and the second flange, and a third roll core is provided between the second flange and the third flange;

A transformer coil, the transformer coil is composed of a primary coil and a secondary coil, the primary coil and the secondary coil are wound on the first winding core and the second winding core; the input end of the primary coil is welded to the pad A, the center tap of the primary coil is welded to pad B, the output end of the primary coil is welded to pad C, the input end of the secondary coil is welded to pad E, and the center tap of the secondary coil is welded to pad F;

A common mode choke coil, the common mode choke coil includes a first coil and a second coil with the same number of turns and phases wound in opposite directions, and the first coil and the second coil are wound on a third winding core , the first wire end of the first coil is welded to the pad G, the second wire end of the first coil is welded to the pad D, the first wire end of the second coil is connected to the output terminal of the secondary coil, and the second coil’s The second wire head is welded to the pad H; the common mode choke coil (30) further includes a third coil (33), the third coil (33) is connected with the first coil (31), the second coil (32) ) are wound together on the third roll core (127);

The pad E is connected to the pad G through an external conductive device, so that the input end of the secondary coil of the transformer is connected to the first wire end of the first coil of the common mode choke coil.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above-mentioned technical scheme that through the new design of the structure of the magnetic core, the integrated multiple I-shaped magnetic cores have three There are three winding cores, wherein the first winding core and the second winding core are used for winding the transformer coil, and the third winding core is used for winding the common mode choke coil, so that the transformer and the common mode choke coil Combined on one magnetic core, it can replace the past two magnetic cores, saving cost and space on the circuit board.

In order to illustrate the structural features and functions of the utility model more clearly, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic view of the overall structure and assembly of the first embodiment of the present invention.

Fig. 2 is an exploded view of the first embodiment of the present invention.

Fig. 3 is a diagram of the winding steps of the first embodiment of the present invention.

Fig. 4 is a circuit diagram of the first embodiment of the present invention.

Fig. 5 is a schematic diagram of the overall structure assembly of the second embodiment of the present invention.

Fig. 6 is an exploded view of the second embodiment of the present invention.

Fig. 7 is a circuit diagram of the second embodiment of the present invention.

Fig. 8 is a schematic diagram of the overall structure assembly of the third embodiment of the present invention.

Fig. 9 is an exploded view of the third embodiment of the present invention.

Explanation of the accompanying drawings:

10. Magnetic core module 11. Flat magnetic core

12. I-shaped magnetic core 121. The first flange

122. Transformer barrier 123. Second flange

124, the third flange 125, the core of the first volume

126. The core of the second roll 127. The core of the third roll

128. Wire slot 20. Transformer coil

21. Primary coil 211. Input end of primary coil

212, the center tap of the primary coil 213, the output terminal of the primary coil

22. Secondary coil 221. Input end of secondary coil

222, the center tap of the secondary coil 223, the output terminal of the secondary coil

30. Common mode choke coil 31. First coil

311, the first thread end of the first coil 312, the second thread end of the first coil

32, the second coil 321, the first thread end of the second coil

322, the second thread end of the second coil 33, the third coil

331, the first thread end of the third coil 332, the second thread end of the third coil

40. Conductive devices.

Detailed ways

Please refer to Fig. 1 to Fig. 4, which shows the specific structure of the first embodiment of the utility model, which is a network transformer structure, including a magnetic core module 10, a transformer coil 20, a common mode choke coil 30. The transformer coil 20 and the common mode choke coil 30 are wound on the magnetic core module 10, and the functions of the transformer and the common mode choke coil are completed by one part.

Wherein, the magnetic core module 10 includes a planar magnetic core 11 and a plurality of integrated I-shaped magnetic cores 12, and the plurality of I-shaped magnetic cores 12 are installed on the planar magnetic core 11, including a first flange 121 , Transformer fence 122, second flange 123, third flange 124, pad A and pad E are provided on both sides of the top of the first flange 121, solder pads are provided on both sides of the top of transformer fence 122 The pad B and pad F are provided with pad C and pad G on both sides of the top of the second flange 123, and pad D and pad H are provided on both sides of the top of the third flange 124. A first roll core 125 is provided between the flange 121 and the transformer barrier 122, a second roll core 126 is provided between the transformer barrier 122 and the second flange 123, and the second flange 123 is connected to the third flange 123. A third roll core 127 is provided between the flanges 124 .

The transformer coil 20 is composed of a primary coil 21 and a secondary coil 22, the primary coil 21 and the secondary coil 22 are wound on the first winding core 125 and the second winding core 126; the input end of the primary coil 211 is soldered to pad A, the center tap 212 of the primary coil is soldered to pad B, the output end 213 of the primary coil is soldered to pad C, the input end 221 of the secondary coil is soldered to pad E, and the secondary coil’s The center tap 222 is soldered to pad F.

The common mode choke coil 30 includes a first coil 31 and a second coil 32 with the same number of turns and phases wound in opposite directions, the first coil 31 and the second coil 32 are wound on the third winding core 127, The first wire end 311 of the first coil is welded to the pad G, the second wire end 312 of the first coil is welded to the pad D, and the first wire end 321 of the second coil is connected to the output terminal 223 of the secondary coil. The second wire stub 322 of the second coil is soldered to the pad H. As shown in FIG.

The pad E and the pad G are connected through an external conductive device 40, so that the input end 221 of the secondary coil of the transformer is connected to the first wire end 311 of the first coil of the common mode choke coil. In this way, a transformer is formed between the first flange 121 and the second flange 123 , and a common mode choke coil is formed between the second flange 123 and the third flange 124 .

Through this new magnetic core design, the transformer and common mode choke are combined on one magnetic core, which can replace the previous two magnetic cores, saving cost and space on the circuit board. In addition, this new magnetic core has a simple structure, is easy to process and manufacture, and has low production cost.

More specifically, the wire between the input end 211 of the primary coil and the center tap 212 is wound on the first winding core 125, and the wire between the center tap 212 of the primary coil and the output end 213 is wound on the second winding core. Winding core part 126; the wire between the input end 221 of the secondary coil and the center tap 222 is wound on the first winding core part 125, and the wire between the center tap 222 and the output end 223 of the secondary coil is wound on The second roll core 126 .

In this embodiment, the conductive device 40 between the pad E and the pad G is a PCB board engraved with a circuit, or a wire, or other conductive device. When the conductive device is a wire, the wire passes through the wire slot 128 on the front side wall of the transformer barrier 122 . In this way, the protruding parts of the wires during transition can be accommodated in these wire passing slots 128 without exceeding the outside of the magnetic core, so that the wiring is neat and does not take up extra space.

The sidewalls on both sides of the first flange 121, the transformer barrier 122, the second flange 123, and the third flange 124 are provided with wire slots 128, and the output end 223 of the secondary coil of the transformer is connected to the common mode The contact position of the first wire end 321 of the second coil of the choke coil passes through the wire passing slot 128 on the front side wall of the second flange 123 .

Next, a general introduction to the manufacturing method of the foregoing network transformer structure is mainly included in the following steps.

(1) Preparation steps:

Prepare the flat sheet magnetic core 11, a plurality of integrated I-shaped magnetic cores 12, the first wire, the second wire, and the third wire, wherein the first wire is used as the primary coil 21 of the transformer, and the second wire is simultaneously The secondary coil 22 of the transformer and the second coil 32 of the common mode choke coil, and the third wire serves as the first coil 31 of the common mode choke coil.

(2) Winding steps:

First define one end of the first wire as the input end 211 of the primary coil of the transformer, and weld it to pad A, define one end of the second wire as the input end 221 of the transformer secondary coil, and solder it to pad E;

Then the first wire and the second wire are wound several times along the first winding core 125. After the first coil 31 is wound, the first wire extends to the pad B and is welded to the pad B, the part of this product that extends the first wire to pad B is defined as the center tap 212 of the primary coil of the transformer; the second wire extends to pad F and is welded to pad F, this product connects the second wire The portion extending to the pad F is defined as the center tap 222 of the secondary coil of the transformer;

Then the first wire and the second wire are wound several times along the second winding core 126. After the winding of the second winding core 126 is completed, the first wire extends to the pad C and is welded to the pad C, so far, the first wire has been wound; the second wire extends to the wire slot 128 on the front side wall of the second flange 123, and this product defines the part where the second wire is located in the wire slot 128 as a transformer The output terminal 223 of the secondary coil, and the first thread end 321 of the second coil as the common mode choke coil at the same time;

Next, define one end of the third wire as the first wire head 311 of the first coil of the common mode choke coil, and weld it to the pad G, and then connect the remaining part of the second wire and the third wire along the first wire The three-volume core 127 is wound several times; when the winding of the third core 127 is completed, the end of the second wire extends to the pad H and is welded to the pad H. So far, the second wire has been wound. The winding is completed; the end of the third wire extends to the pad D and is welded to the pad D. So far, the third wire has been wound;

Finally, the pad E is connected to the pad G through an external conductive device 40, so that the input end 221 of the secondary coil of the transformer is connected to the first wire end 311 of the first coil of the common mode choke coil.

(3) Lamination steps of the flat magnetic core 11:

The planar magnetic core 11 is bonded to the bottom of a plurality of integrated I-shaped magnetic cores 12 to form a closed magnetic circuit. In this way, a transformer is formed between the first flange 121 and the second flange 123, and the second flange 123 A common mode choke coil is formed between the third flange 124 .

Wherein, the conductive device 40 is a wire, and the wire passes through the wire slot 128 on the front side wall of the transformer barrier 122 .

With this magnetic core structure, 8 pads are formed on the magnetic core, only three wires are required to participate in the winding, and the winding continues after the intermediate welding, without the need for intermediate cutting and repositioning, the network shown in Figure 4 can be realized The number of welding times of the transformer, the winding process is simple, the requirements for the winding machine are low, and the winding efficiency is high. The production method of the utility model is easy to process and manufacture, and is suitable for automatic production. , reducing production costs.

Please refer to Fig. 5 to Fig. 7, which shows the specific structure of the second embodiment of the present invention, which is a network transformer structure. The structure of this embodiment is basically the same as that of the first embodiment, both including magnetic cores Module 10, transformer coil 20, common mode choke coil 30, the transformer coil 20 and common mode choke coil 30 are wound on the same magnetic core module 10, and the transformer and common mode choke coil are completed by one part circle function.

The structure of this embodiment is different from the second embodiment in that: this second embodiment adds a pad O on the basis of 8 pads, that is, there are 9 pads in total. And, a winding wire is added to the common mode choke coil 30 , which is called the third coil 33 . Wherein, the pad O is disposed on the third flange 124 , which is located between the pad D and the pad H. As shown in FIG. The third coil 33, the first coil 31 and the second coil 32 are all wound on the third winding core 127, the first wire head 331 of the third coil is welded to the pad F, the second wire of the third coil Header 332 is soldered to pad O. In this embodiment, since there is a distance between the pad F and the third winding core 127 , corresponding wires of the third coil 33 pass through the wire slot 128 on the side of the second flange 123 . Through this design, the common mode choke coil 30 has a three-wire output, and the output points are pad H, pad O, and pad D respectively, which meets the general three-wire wiring requirements and is convenient for connecting with existing general-purpose terminals. . The equivalent circuit of the network transformer of the second embodiment is shown in FIG. 7 .

The manufacturing method of the network transformer of the second embodiment is basically the same as that of the first embodiment, except that the winding method of the third coil 33 is added. Therefore, in (1) the preparation step, it is necessary to add one more wire, Call it the fourth wire, and the fourth wire serves as the third coil 33 . In (2) the winding step, the winding method for the fourth wire is as follows: one end of the fourth wire is defined as the first wire end 331 of the third coil of the common mode choke coil, and the other end is defined as the third The second wire end 332 of the coil, the first wire end 331 of the third coil is welded to the pad F, the wire close to the pad F passes through the wire slot 128 on the side of the second flange 123, and the fourth wire The middle part is wound on the third winding core 127 , and the second wire end 332 of the third coil is welded to the pad O. So far, the fourth wire has been wound to form the third coil 33 . (3) The bonding step of the planar magnetic core 11 is the same as that of the first embodiment, and will not be repeated here.

Please refer to Fig. 8 to Fig. 9, which shows the specific structure of the third embodiment of the present utility model, which is a network transformer structure. The structure of this embodiment is basically the same as that of the second embodiment, the difference is that : The magnetic core module 10 has increased pads P, that is, has 10 pads in total. The first wire end 331 of the third coil is welded to the pad P, the second wire end 332 of the third coil is welded to the pad O, and then the conductive device 40 is used to connect the pad P and the pad F. For example, the conductive device 40 can For the PCB board engraved with the circuit, the same function as the second embodiment can also be realized.

In summary, the focus of the design of the present utility model is that, through the new design of the structure of the magnetic core, there are three winding cores on the multiple I-shaped magnetic cores 12 of the integral type, wherein the first winding core 125 and The second winding core portion 126 is used for winding the transformer coil 20, and the third winding core portion 127 is used for winding the common mode choke coil 30, so that the transformer and the common mode choke coil are combined on one magnetic core, which can It replaces the past two magnetic cores, saving cost and space on the circuit board.

The above are only preferred embodiments of the present utility model, and do not limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model , all still belong to the scope of the technical solution of the utility model.

Claims (7)

1. a kind of network transformer structure, it is characterised in that：Including

Magnetic core module（10）, the magnetic core module include plain film magnetic core（11）With multiple I-shaped magnetic cores of integral type（12）, this is more A I-shaped magnetic core is installed on plain film magnetic core, includes first flange（121）, transformer jube（122）, second flange （123）, the 3rd flange（124）, pad A and pad E is equipped in the top both sides of first flange, in the top of transformer jube two Side is equipped with pad B and pad F, pad C and pad G is equipped in the top both sides of second flange, in the top both sides of the 3rd flange Equipped with pad D and pad H, the first core is equipped between the first flange and transformer jube（125）, the transformer jube with The second core is equipped between second flange（126）, the 3rd core is equipped between the second flange and the 3rd flange（127）；

Transformer coil（20）, which is by primary coil（21）And secondary coil（22）It forms, the primary line Circle and secondary coil are wound in the first core and the second core；The input terminal of the primary coil（211）It is welded in pad A, the centre cap of primary coil（212）It is welded in pad B, the output terminal of primary coil（213）It is welded in pad C, described time The input terminal of grade coil（221）It is welded in pad E, the centre cap of secondary coil（222）It is welded in pad F；

Common mode choke coil（30）, which includes the number of turn and the reversed first coil of all identical coiling of phase （31）With the second coil（32）, the first coil and the second coil winding are in the 3rd core, first the end of a thread of first coil （311）It is welded in pad G, second the end of a thread of first coil（312）Pad D is welded in, first the end of a thread of second coil（321） It is connected with the output terminal of secondary coil, second the end of a thread of the second coil（322）It is welded in pad H；The common mode choke coil （30）Further comprise there is tertiary coil（33）, the tertiary coil（33）With first coil（31）, the second coil（32）Together around It is formed on the 3rd core (127)；

The pad E and pad G pass through external conductive devices（40）It is connected, makes the input terminal of transformer secondary coil（221）With First the end of a thread of common mode choke first coil（311）It is conducted.

2. a kind of network transformer structure according to claim 1, it is characterised in that：3rd flange（124）Upper increasing Equipped with pad O, first the end of a thread of tertiary coil（331）It is welded in pad F, second the end of a thread of tertiary coil（332）It is welded in Disk O.

3. a kind of network transformer structure according to claim 2, it is characterised in that：The tertiary coil（33）In, Conducting wire between pad F and the 3rd core (127) passes through second flange（123）The crossed beam trunking of side（128）.

4. a kind of network transformer structure according to claim 2, it is characterised in that:The second flange（123）Upper increasing If pad P, first the end of a thread of tertiary coil（331）It is welded in pad P, second the end of a thread of tertiary coil（332）It is welded in pad O；Pass through conductive devices between pad P and pad O（40）It is connected.

5. a kind of network transformer structure according to claim 4, it is characterised in that：Between the pad E and pad G Conductive devices（40）For conducting wire, the conducting wire is from transformer jube（122）The crossed beam trunking of front side wall（128）It passes through；The pad P with Conductive devices between pad O are the pcb board for being carved with circuit.

6. a kind of network transformer structure according to claim 1, it is characterised in that：The first flange（121）, transformation Device jube（122）, second flange（123）, the 3rd flange（124）Two side be equipped with crossed beam trunking（128）, the transformer The output terminal of grade coil（223）With first the end of a thread of the second coil of common mode choke（321）Connecting position is from second flange （123）The crossed beam trunking of front side wall（128）It passes through.

7. a kind of network transformer structure according to claim 1, it is characterised in that：The input terminal of the primary coil （211）With primary coil centre cap（212）Between conducting wire be wound in the first core（125）, the center of primary coil is taken out Head（212）With primary coil output terminal（213）Between conducting wire be wound in the second core（126）；The secondary coil it is defeated Enter end（221）With secondary coil centre cap（222）Between conducting wire be wound in the first core（125）, in secondary coil Heart tap（222）Conducting wire between output terminal is wound in the second core（126）.