CN213635674U - Flat transformer - Google Patents
Flat transformer Download PDFInfo
- Publication number
- CN213635674U CN213635674U CN202022877164.6U CN202022877164U CN213635674U CN 213635674 U CN213635674 U CN 213635674U CN 202022877164 U CN202022877164 U CN 202022877164U CN 213635674 U CN213635674 U CN 213635674U
- Authority
- CN
- China
- Prior art keywords
- planar transformer
- iron core
- terminal
- primary winding
- secondary winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 claims abstract description 61
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052802 copper Inorganic materials 0.000 claims abstract description 41
- 239000010949 copper Substances 0.000 claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000010030 laminating Methods 0.000 claims abstract description 3
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 239000004642 Polyimide Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 229920001721 polyimide Polymers 0.000 claims description 5
- 239000011889 copper foil Substances 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 14
- 239000006185 dispersion Substances 0.000 abstract description 3
- 239000002390 adhesive tape Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Landscapes
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model provides a flat transformer, which comprises an iron core and a plurality of layers of PCB power supply boards arranged in a laminating way, wherein the iron core is fixed on the PCB power supply boards to form a closed magnetic circuit; the planar transformer also comprises a primary winding and a secondary winding, wherein the primary winding is electrically connected with the input circuit, and the secondary winding is electrically connected with the output circuit; the number of turns of the primary winding is 4, and the primary winding surrounds the iron core; the secondary winding comprises two copper sheet bodies with the thickness of 0.25mm, a flat copper coil is wound on each copper sheet body, and the number of turns of each flat copper coil is 7. The utility model provides a flat copper coil winding copper sheet body is selected to planar transformer's secondary winding to guarantee that planar transformer generates heat some dispersion at work, be difficult for concentrating on a point, make planar transformer have better radiating effect, improve planar transformer's work efficiency. And the utility model discloses in set up two copper sheet bodies, form the intermediate layer effect, effectively reduce the leakage inductance.
Description
Technical Field
The utility model relates to a transformer technical field, concretely relates to planar transformer.
Background
In some electronic products, such as electronic ballast power supplies, LED drivers, chargers, and computers, various electronic components such as transformers, inductors, filters, and chokes are used. Along with the development of circuit ultra-large scale and system integration, component slice type and printed circuit board PCB surface mounting high-density, many electronic products tend to portable design, the volume of the product is reduced, the weight is lightened, and when some electronic products are designed, the size thickness and the size of the product have a specified value, so that the height of the electronic components mounted in the electronic products is limited to a certain extent.
In various electronic components, such as a transformer, when the transformer is designed, in order to ensure output power, the window area, the coil sectional area, and the like of the transformer must reach certain values, so that the size (length, width, and height) of the transformer cannot be reduced at will, and when a conventional transformer is installed in an electronic product with certain limitation on installation height, the size of the transformer is limited by the design height of the electronic product.
The transformer in the traditional mode is characterized in that a primary coil and a secondary coil are wound by a framework, a pair of magnetic cores penetrates through the framework and is wound and fixed by adhesive tapes, and the transformer has the defects of complex manufacturing process, poor product consistency, poor coupling of the primary coil and the secondary coil and larger leakage inductance.
Compared with the conventional framework transformer, the planar transformer has the advantages that the planar winding of the transformer and even the planar transformer constructed by the new process of the coil assembly have larger advantages in the aspect of improving the characteristics of the switching power supply by using the existing printed circuit board manufacturing technology, and compared with the conventional transformer, the planar transformer has the characteristics of good coupling performance between windings, high efficiency and small magnetic flux leakage. Meanwhile, the planar transformer is an innovative trend to realize the thinning and high frequency of the transformer, and is widely applied to various switching power supplies with a plurality of advantages (such as high frequency, low modeling, low magnetic core loss and the like).
The biggest difference between the skeleton transformer of planar transformer and traditional mode is in iron core and coil winding, how to reduce direct current copper and hinder, the leakage inductance, restrain radio frequency interference's basis, reduce the heat production of planar transformer in work, promote planar transformer's work efficiency, become the problem that awaits a urgent need to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a planar transformer to solve the technical problem who exists among the prior art.
In order to solve the technical problem, an embodiment of the utility model discloses a flat transformer, which comprises an iron core and a plurality of layers of PCB power supply boards arranged in a laminating way, wherein the iron core is fixed on the PCB power supply boards to form a closed magnetic circuit;
the planar transformer further comprises a primary winding and a secondary winding, the primary winding has a first terminal and a second terminal, the first terminal and the second terminal are respectively and electrically connected with the input circuit, the secondary winding has a third terminal and a fourth terminal, and the third terminal and the fourth terminal are respectively and electrically connected with the output circuit;
the primary winding is printed on the PCB power supply board in a spiral surrounding mode through a copper foil in an etching mode, the number of turns of the primary winding is 4, and the primary winding surrounds the iron core;
the secondary winding comprises a copper sheet body with the thickness of 0.25mm, a flat copper coil is wound on the copper sheet body, and the number of turns of the flat copper coil is 7.
Optionally, an insulation gap of 0.5mm is provided between adjacent flat copper coils.
Optionally, the bends of adjacent flat copper coils are aligned.
Optionally, the number of the secondary windings is at least two, and the adjacent secondary windings are connected through polyimide tape bonding.
Optionally, at least two of said secondary windings are wound with insulating tape around their circumferential edges in the assembled state.
Optionally, the PCB power board is provided with a mounting through hole, the iron core penetrates through the mounting through hole and is fixedly connected with the PCB power board, and the secondary winding surrounds the iron core.
Optionally, the planar transformer further comprises a contact pin, and the contact pin is fixed on the PCB power board in a welding manner and electrically connected with the secondary winding.
Optionally, the iron core is an EE-type iron core or an EI-type iron core.
Optionally, the planar transformer includes a housing, and a heat dissipation structure is disposed on the housing.
Optionally, an insulating layer is disposed at the bottom of the iron core.
The utility model has the advantages that: the utility model provides a flat copper coil winding copper sheet body is selected to planar transformer's secondary winding to guarantee that planar transformer generates heat some dispersion at work, be difficult for concentrating on a point, make planar transformer have better radiating effect, improve planar transformer's work efficiency. And the utility model discloses in set up two copper sheet bodies, form the intermediate layer effect, effectively reduce the leakage inductance.
Drawings
Fig. 1 shows one of the structural diagrams of a planar transformer according to an embodiment of the present invention;
fig. 2 shows a second structure diagram of a planar transformer according to an embodiment of the present invention.
Wherein,
1. a first terminal;
2. a second terminal;
3. a third terminal;
4. a fourth terminal;
5. a housing;
6. a primary winding;
7. a secondary winding.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.
The embodiment of the utility model discloses planar transformer, secondary winding select flat copper coil winding copper sheet body to guarantee that planar transformer generates heat some dispersion at work, be difficult for concentrating on a point, make planar transformer have better radiating effect, improve planar transformer's work efficiency. And the utility model discloses in set up two copper sheet bodies, form the intermediate layer effect, effectively reduce the leakage inductance.
As shown in fig. 1 and 2, the planar transformer in this embodiment includes an iron core and a plurality of layers of PCB power boards arranged in a stacked manner, wherein the iron core is fixed on the PCB power boards to form a closed magnetic circuit. The iron core can be of an integrated structure or a split structure, for example, the iron core can be of two split structures, a first iron core and a second iron core are clamped on the PCB power panel and connected in a bonding mode to form a closed magnetic circuit. For another example, the first iron core and the second iron core clamp the PCB power panel and are connected in a bonding manner, a silica gel pad is disposed on the first iron core or the second iron core, and the first iron core or the second iron core is in contact with the metal member through the silica gel pad. Therefore, the planar transformer in the application can set the number of the PCB power supply boards according to specific needs, and adjust the position relation between the PCB power supply boards and the iron core so as to obtain more combination modes and adapt to specific use requirements.
Preferably, the iron core is an EE type iron core or an EI type iron core, and is generally made of a high-frequency power ferrite material, has low magnetic core loss at high frequency, is the best material in the industry, is not easily saturated, is not easily heated, and has good working efficiency in a specified working environment.
The planar transformer further comprises a primary winding 6 and a secondary winding 7, wherein the primary winding 6 is provided with a first terminal 1 and a second terminal 2, the first terminal 1 and the second terminal 2 are respectively and electrically connected with an input circuit, the secondary winding 7 is provided with a third terminal 3 and a fourth terminal 4, and the third terminal 3 and the fourth terminal 4 are respectively and electrically connected with an output circuit. The primary winding 6 is printed on the PCB power supply board in a spiral surrounding mode through a copper foil in an etching mode, the number of turns of the primary winding 6 is 4, and the primary winding 6 surrounds the iron core.
The secondary winding 7 comprises two copper sheet bodies with the thickness of 0.25mm, a flat copper coil is wound on each copper sheet body, and the number of turns of each flat copper coil is 7. The secondary winding 7 is formed by winding a copper sheet body by a flat copper coil, so that heat generating points of the flat transformer are dispersed in the working process, and the flat transformer is not easy to concentrate on one point, so that the flat transformer has a better heat dissipation effect, and the working efficiency of the flat transformer is improved. And the utility model discloses in set up two copper sheet bodies, form the intermediate layer effect, effectively reduce the leakage inductance.
And 0.5mm of insulation gap is arranged between the adjacent flat copper coils on each copper sheet body, so that a better voltage-resistant effect is achieved between the two adjacent turns of flat copper coils. And, in order to further improve the effect of the transformer, the bending parts of the adjacent flat copper coils on each copper sheet body are aligned.
Furthermore, the PCB power panel is provided with a mounting through hole, the iron core penetrates through the mounting through hole and is fixedly connected with the PCB power panel, and the primary winding 6 surrounds the iron core. The PCB power supply boards are also provided with through holes, and the primary windings 6 on the two adjacent PCB power supply boards are electrically connected through the through holes. The flat-plate transformer further comprises a contact pin, wherein the contact pin is fixed on the PCB power panel in a welding mode and electrically connected with the secondary winding 7, so that the electrical connection performance is more reliable. In addition, the planar transformer further comprises a surface paste so as to obtain good insulation performance. And an insulating layer is arranged at the bottom of the iron core.
Further, the adjacent secondary windings 7 are connected through a polyimide adhesive tape in an adhesive mode, the polyimide adhesive tape comprises two layers, and the thickness of each layer of the polyimide adhesive tape is 0.06mm, so that a good insulation effect is achieved. Meanwhile, in the assembled state of the two secondary windings 7, the peripheral edges of the two secondary windings are wound with the insulating tapes, and in the assembling process, the insulating tapes penetrate through the central holes of the secondary windings 7 to tightly wrap the peripheral edges of the secondary windings, so that the insulating effect is further improved.
The planar transformer comprises a shell 5, wherein a heat dissipation structure is arranged on the shell 5 and can be heat dissipation holes in the shape without specific limitation in order to further improve the heat dissipation effect, and the heat dissipation holes are preferably uniformly distributed on the whole shell.
The planar transformer in the application can be vertical and horizontal, the overall height of the planar transformer is not more than 30mm, the highest power that can be realized is 6kW, and the highest frequency is 200 kHz. And the planar transformer in this application can effectively reduce direct current copper and hinder, reduces leakage inductance and distributed capacitance, satisfies resonant circuit's design demand, because the iron core has good magnetic screen effect, consequently, can effectively restrain radio frequency interference.
The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (10)
1. A flat transformer is characterized by comprising an iron core and a plurality of layers of PCB power supply boards arranged in a laminating mode, wherein the iron core is fixed on the PCB power supply boards to form a closed magnetic circuit;
the planar transformer further comprises a primary winding and a secondary winding, the primary winding has a first terminal and a second terminal, the first terminal and the second terminal are respectively and electrically connected with the input circuit, the secondary winding has a third terminal and a fourth terminal, and the third terminal and the fourth terminal are respectively and electrically connected with the output circuit;
the primary winding is printed on the PCB power supply board in a spiral surrounding mode through a copper foil in an etching mode, the number of turns of the primary winding is 4, and the primary winding surrounds the iron core;
the secondary winding comprises two copper sheet bodies with the thickness of 0.25mm, a flat copper coil is wound on each copper sheet body, and the number of turns of each flat copper coil is 7.
2. The planar transformer according to claim 1, wherein an insulation gap of 0.5mm is provided between adjacent flat copper coils on each copper sheet body.
3. The planar transformer of claim 1, wherein the bends of adjacent flat copper coils on each copper sheet body are aligned.
4. The planar transformer according to claim 1, wherein adjacent secondary windings are bonded together by polyimide tape.
5. A planar transformer according to claim 4, wherein the two secondary windings are wound with insulating tape around their circumferential edges in the assembled state.
6. The planar transformer according to claim 1, wherein the PCB power board is provided with a mounting through hole, the iron core penetrates through the mounting through hole and is fixedly connected with the PCB power board, and the secondary winding is disposed around the iron core.
7. The planar transformer according to claim 1, further comprising a pin fixed on the PCB power board by soldering to be electrically connected to the secondary winding.
8. The planar transformer according to claim 1, wherein the core is an EE-type core or an EI-type core.
9. The planar transformer according to claim 1, wherein the planar transformer comprises a housing, and the housing is provided with a heat dissipation structure.
10. The planar transformer according to claim 1, wherein the bottom of the iron core is provided with an insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022877164.6U CN213635674U (en) | 2020-12-03 | 2020-12-03 | Flat transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022877164.6U CN213635674U (en) | 2020-12-03 | 2020-12-03 | Flat transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213635674U true CN213635674U (en) | 2021-07-06 |
Family
ID=76639480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022877164.6U Expired - Fee Related CN213635674U (en) | 2020-12-03 | 2020-12-03 | Flat transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213635674U (en) |
-
2020
- 2020-12-03 CN CN202022877164.6U patent/CN213635674U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210706 Termination date: 20211203 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |