TW201837933A - Structures of Inverter and Assembly Method thereof - Google Patents

Abstract

A method of assembling an inverter is disclosed including: winding coils around a bobbin; inserting a first core-column of a first iron-core in a through hole of the bobbin; disposing a first insulator, a middle iron-core and a second insulator in the through hole from another side of the bobbin sequentially; and inserting a second core-column of a second iron-core in the through hole from a second side of the bobbin and contacting with the second insulator. Structures of an inverter are also disclosed. The range of magnetic field formed by the cores in the winding coils will not affect the external winding in order to reduce a magnetic loss, reduce the magnetic field radiation and reduce the effect of EMI interference.

Description

Transformer structure and its assembly method

The invention relates to a transformer technology, in particular to a small-volume transformer structure and assembly method.

The general transformer structure mainly comprises a bobbin, a main winding, a secondary winding and a magnetic core group, wherein the main winding and the secondary winding are wound on the winding frame separately from each other; The assembly is assembled on the bobbin of the wound main stage and the secondary winding and partially inserted into the passage of the bobbin, thereby completing the assembly of the transformer.

Moreover, most of today's electronic products are required to be light and thin, so the external volume of the transformer is reduced with the overall volume of the product. However, when the volume of the transformer is getting smaller and smaller, the distance between the core group and the winding group is also shortened, so that the magnetic flux generated by the core group affects the external winding group and generates magnetic Interference, causing excessive magnetic loss, reduces transformer conversion efficiency.

In view of the above, the inventors of the present invention have made great efforts to solve the above problems in view of the above-mentioned prior art, and have made great efforts to solve the above problems, which has become the object of improvement of the present inventors.

An object of the present invention is to provide a transformer structure and a method for assembling the same, wherein the magnetic flux lines formed by the first iron core, the intermediate iron core and the second iron core which are linearly connected in series in the winding group do not affect the external winding group It can achieve the function of reducing magnetic loss and improving efficiency.

An object of the present invention is to provide a transformer structure and a method for assembling the same, which can reduce magnetic field radiation and achieve the effect of reducing EMI interference (electromagnetic interference).

In order to achieve the above object, the present invention is a transformer structure including a winding group, a first core, a first insulator, an intermediate core, a second insulator, and a second core. The winding group comprises a winding frame and a coil group wrapped around the winding frame, and the winding frame has a through hole; the first core has a first core, and the first core is disposed on one side of the winding frame a first core is received in the through hole; the first insulator is disposed in the through hole and abuts against a side of the first core; the intermediate core is disposed in the through hole and abuts the first insulator; a second insulator disposed in the through hole and attached to the other side of the intermediate core with respect to the first insulator; and the second core having a second core that is placed opposite to the first core The other side of the bobbin is received in the through hole and abuts against the second insulator.

The detailed description and technical content of the present invention are set forth in the accompanying drawings.

Please refer to FIG. 1 and FIG. 2 , which are schematic perspective views and perspective exploded views of the transformer structure of the present invention. The transformer structure 1 of the present invention comprises a winding group 10, a first core 20, a first insulator 30, an intermediate core 40, a second insulator 50, a second core 60 and a plurality of guiding legs. 70. The first core 20 and the second core 60 are correspondingly disposed on two sides of the winding group 10. The guiding legs 70 are disposed on a bottom surface of the winding group 10. The first insulator 30, the intermediate core 40, the second insulator 50, and the second core 60 are placed in the winding assembly 10 to form the transformer structure 1.

Referring to FIG. 2 , the winding assembly 10 includes a bobbin 11 and a coil assembly 12 sleeved around the bobbin 11 . The bobbin 11 has a through hole 110, and the bobbin 11 has a first side 11a and a second side 11b. Specifically, the bobbin 11 includes a bobbin 111 and a plurality of bottom ribs 112 connecting the bobbin 111. The through-holes 110 are disposed in the bobbins 111. The bottom ribs 112 are disposed on opposite sides of the bobbin 111, and the guiding legs 70 are spaced apart from the bottom ribs 112. on.

The first core 21 has a first stem 21 that is disposed on one side of the bobbin 11 and the first stem 21 is received in the through hole 110. In more detail, the first core 21 further includes a first connecting piece 22 and two first chips 23. The two first chips 23 are located on opposite sides of the first connecting piece 22 , and the first core 21 is located between the two first chips 23 . The two first chips 23 and the first stem 21 extend from the first connecting piece 22 in the same direction. Preferably, the extension length of the first stem 21 from the first connecting piece 22 is shorter than the extended length of the two first chips 23, thereby reducing the overall volume of the transformer 1.

The first insulator 30 is disposed in the through hole 110 of the bobbin 11 and abuts against a side surface of the first stem 21 . Furthermore, the intermediate core 40 is also disposed in the through hole 110 and is in contact with the first insulator 30. In addition, the second insulator 50 is also disposed in the through hole 110 of the bobbin 11 and is attached to the other side of the intermediate core 40 with respect to the first insulator 30. Preferably, the first insulator 30 and the second insulator 50 are respectively an insulating sheet; in addition, the intermediate core 40 is an I-shaped core.

Further, the second core 60 has a second stem 61. The second core 60 is disposed on the other side of the bobbin 11 with respect to the first core 20, and the second core 61 is received in the through hole 110 and abuts the second Insulator 50. In more detail, the second core 60 further includes a second connecting piece 62 and two second chips 63. The two second chips 63 are spaced apart from each other on opposite sides of the second connecting piece 62 , and the second core 61 is located between the two second chips 63 . The second chip 63 and the second stem 61 extend from the second connecting piece 62 in the same direction. Preferably, the extension length of the second stem 61 from the second connecting piece 62 is shorter than the extended length of the two second chips 63, thereby reducing the overall volume of the transformer 1.

Please refer to FIG. 3, which is a flow chart of a combination method of the transformer structure of the present invention. The transformer structure of the present invention is assembled as follows. First, a winding group 10 is provided which winds the coil assembly 12 outside the bobbin 11 (step a), wherein the bobbin 11 has a first side 11a and a second side 11b opposite to each other. Next, the first stem 21 of the first core 20 is inserted into the through hole 110 of the bobbin 11 from the first side 11a of the bobbin 11 (step b).

In addition, the first insulator 30, the intermediate core 40, and the second insulator 50 are sequentially inserted into the through hole 110 of the bobbin 11 from the second side 11b of the bobbin 11, and the first insulator 30 is attached thereto. The first stem 21 and the intermediate core 40 are interposed between the first insulator 30 and the second insulator 50 (step c).

In addition, the second stem 61 of the second core 60 is inserted into the through hole 110 of the bobbin 11 from the second side 11b of the bobbin 11, and the second stem 61 is attached to the second insulator 50 (step d). Subsequently, the plurality of lead pins 60 are spaced apart on the lead frame 11. Finally, the first core 20 and the second core 60 are fixed to the bobbin 11. The assembly of the transformer structure 1 of the present invention is completed.

Please refer to FIG. 4, which is a cross-sectional view of the transformer structure of the present invention. After the transformer structure of the present invention is completed in the aforementioned manner, the first core 20 and the second core 60 are disposed on the bottom rib 112 of the bobbin 11. In addition, the two first chips 23 are framed on one side of the coil group 12; and the second chips 63 are framed on the other side of the coil group 12 with respect to the two first chips 23. Preferably, the two first chips 23 and the two second chips 63 are framed around the circumference of the winding frame 11.

It is to be noted that the intermediate core 40 is disposed at the middle of the through hole 110 of the bobbin 11, and the first core 21, the first insulator 30, the intermediate core 40, and the second insulator The total length of the combined 50 and the second stem 61 is equal to the length of the through hole 110.

Please refer to FIG. 5 as a schematic diagram of the magnetic core of the transformer structure of the present invention. As shown, the core assembly of the transformer structure 1 of the present invention passes through the winding assembly 10 and includes a first core 20 (first stem 21), an intermediate core 40, and a second core 40 (first Two-column 41). It is to be noted that the first core 21, the intermediate core 40 and the second stem 41 are threaded in a winding manner in the winding group 10, and the first core 20 and the intermediate core 40 are sandwiched. The first insulator 30 is disposed; further, the second core 20 and the intermediate core 40 are sandwiched by the second insulator 50.

Accordingly, the magnetic lines of force between the first stem 21, the intermediate core 40, and the second stem 415 in the winding group 10 are separated into a plurality of segments by the arrangement of the first insulator 30 and the second insulator 50, and A smaller magnetic range is formed. Thereby, the magnetic lines of force formed by the first core 21, the intermediate core 40 and the second core 415 in the winding group 10 can not affect the external winding group 10, so mutual magnetic interference can be avoided, and the magnetic loss can be reduced. , the function of improving efficiency.

Specifically, the transformer structure 1 of the present invention has a double air gap between the first stem 21, the intermediate core 40 and the second stem 415; in addition, compared to a single air gap of a conventional transformer, the present invention The length of the air gap is half that of the conventional transformer, so that the area of the magnetic flux (magnetic leakage) radiating outward can be reduced, the magnetic loss of the magnetic line to the outer winding group can be greatly reduced, thereby achieving the function of improving the efficiency; further, the transformer structure of the present invention It can also reduce the magnetic field radiation to reduce the EMI interference (electromagnetic interference).

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and other equivalent variations of the patent spirit of the present invention are all within the scope of the invention.

1‧‧‧Transformer structure

10‧‧‧ Winding Group

11‧‧‧ Winding frame

11a‧‧‧ first side

11b‧‧‧ second side

110‧‧‧through holes

111‧‧‧winding

112‧‧‧ bottom rib

12‧‧‧ coil group

20‧‧‧First core

21‧‧‧first pillar

22‧‧‧First connecting piece

23‧‧‧First chip

30‧‧‧First insulator

40‧‧‧Intermediate core

50‧‧‧second insulator

60‧‧‧second core

61‧‧‧second core column

62‧‧‧Second connection piece

63‧‧‧second chip

70‧‧‧ lead pin

a~d‧‧‧step

1 is a schematic perspective view of a transformer structure of the present invention.

2 is a perspective exploded view of the transformer structure of the present invention.

3 is a flow chart of a combination method of the transformer structure of the present invention.

Figure 4 is a perspective exploded view of the present invention.

Fig. 5 is a schematic view showing the magnetic core of the iron core of the press structure of the present invention.

Claims (10)

A transformer structure comprising: a winding set comprising a winding frame and a coil set surrounding the winding frame, and the winding frame has a through hole; a first core having a first a first core is disposed on one side of the bobbin, and the first core is received in the through hole; a first insulator is disposed in the through hole and is attached thereto a side of the first stem; an intermediate core disposed in the through hole and abutting the first insulator; a second insulator disposed in the through hole and attached to the first insulator The other side of the intermediate core; and a second core having a second core, the second core being disposed on the other side of the bobbin opposite to the first core, The second core column is received in the through hole and abuts against the second insulator. The transformer structure of claim 1, further comprising a plurality of guiding legs, the winding frame comprising a bobbin and a plurality of bottom ribs connecting the bobbins, wherein the through holes are located in the bobbin The bottom ribs are disposed on opposite sides of the bobbin, and the guiding legs are spaced apart from the bottom ribs; the first core and the second core are disposed on the bottom ribs. The transformer structure of claim 1, wherein the first insulator and the second insulating system are respectively an insulating sheet; and the intermediate core is an I-shaped core. The transformer structure of claim 1, wherein the first core further comprises a first connecting piece and two first chips, wherein the two first chips are located on opposite sides of the first connecting piece, and the first The core is located between the two first chips, and the two first chips and the first core respectively extend from the first connecting piece in the same direction; the second core further includes a second connecting piece and two a second chip, the second chip is located on opposite sides of the second connecting piece, and the second core is located between the two second chips, the second chip and the second core The second connecting piece extends from the second connecting piece in the same direction. The transformer structure of claim 4, wherein the extension length of the first stem from the first tab is shorter than the extension length of the two first chips; the extension of the second stem from the second tab The length is shorter than the extension length of the two second chips. The transformer structure of claim 4, wherein the two first chips are bound to one side of the coil set, and the two second chips are framed on the other side of the coil set with respect to the two first chips; The two first chips and the two second chip frames surround the periphery of the winding frame. The transformer structure of claim 1, wherein the intermediate core is disposed at a middle of the through hole, the first core, the first insulator, the intermediate core, the second insulator, and the second stem The combined total length is equal to the length of the through hole. A transformer assembly method comprising the transformer structure according to any one of claims 1 to 7, comprising: winding a coil assembly outside the bobbin, the bobbin having an opposite first side and a second side; Inserting the first core of the first core into the through hole of the bobbin from the first side of the bobbin; placing the first insulator, the intermediate core and the second insulator sequentially from the second side of the bobbin a through hole of the bobbin, and the first insulator is attached to the first core, the intermediate core is sandwiched between the first insulator and the second insulator; and the second core of the second core is self-winding The second side of the wire is inserted into the through hole of the bobbin and the second leg is attached to the second insulator. The transformer assembly method of claim 8, further comprising setting the plurality of lead pins on the lead frame. The transformer assembly method of claim 8, further comprising fixing the first core and the second core to the bobbin.