CN217788165U

CN217788165U - Planar transformer

Info

Publication number: CN217788165U
Application number: CN202222132443.9U
Authority: CN
Inventors: 覃新宏
Original assignee: Guangxi Kaishenda Electronics Co ltd
Current assignee: Guangxi Kaishenda Electronics Co ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-11-11
Anticipated expiration: 2032-08-12

Abstract

The application relates to a planar transformer, which comprises a flat coil, a coil plate and a magnetic core capable of being spliced, wherein the input end and the output end of the flat coil are provided with lead ends, the lead ends extend outwards along the vertical direction of the coil plate, the coil plate is connected with an electric connector, a through hole is formed in the middle of the coil plate, one side of the coil plate is provided with a through groove, and the lead ends can pass through the through groove; the magnetic core capable of being spliced comprises a bottom plate, a magnetic column arranged in the center of the bottom plate, edge blocks arranged on two opposite edges of the bottom plate and a top plate, wherein the flat coil surrounds the magnetic column, the magnetic column penetrates through the coil plate along the through hole, the flat coil and the coil plate are stacked in a layered mode, and the edge blocks, the top plate and the bottom plate sandwich the flat coil and the coil plate. The method has the advantages that the maximum working current of the secondary winding is large, and therefore the effect of transmitting high power can be achieved.

Description

Planar transformer

Technical Field

The application relates to the field of transformers, in particular to a planar transformer.

Background

The planar transformer has the characteristics of small height, high frequency, good insulating property and the like, and is widely applied to the fields of electronic equipment, aerospace, medicine and the like. The transformer mainly comprises a primary winding, a secondary winding and a magnetic pole, wherein alternating current is input into the primary winding of the planar transformer to cause the change of magnetic flux in the magnetic pole, so that induced current is generated in the secondary winding, and the purpose of transforming voltage is achieved by utilizing the ratio of the number of turns of the primary winding to the number of turns of the secondary winding.

In the related art, the planar transformer mostly only uses the PBC board with the built-in coil as the primary winding or the secondary winding, so that the design is simple and the assembly is convenient, while the maximum current allowed by the built-in coil of the PBC board is relatively small, and when the output voltage is fixed, the transmission of large power cannot be realized.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the maximum current which can pass through the secondary coil of the planar transformer in the related art is low, so that the transmitted power is generally low, the application provides a planar transformer.

The application provides a planar transformer adopts following technical scheme:

a planar transformer comprises a flat coil, a coil plate and a magnetic core capable of being spliced, wherein the input end and the output end of the flat coil are provided with lead ends, the lead ends extend outwards along the vertical direction of the coil plate, the coil plate is connected with an electric connector, a through hole is formed in the middle of the coil plate, a through groove is formed in one side of the coil plate, and the lead ends can penetrate through the through groove; the magnetic core capable of being spliced comprises a bottom plate, a magnetic column arranged in the center of the bottom plate, edge blocks arranged on two opposite sides of the bottom plate and a top plate, wherein the flat coil surrounds the magnetic column, the magnetic column penetrates through the coil plate along the through hole, the flat coil and the coil plate are stacked in a layered mode, and the edge blocks, the top plate and the bottom plate clamp the flat coil and the coil plate.

By adopting the technical scheme, the maximum working current of the conductor is determined by the heat dissipation performance and the resistivity of the conductor, wherein the heat dissipation performance is determined by the conductor material, the resistivity is determined by the conductor material and the cross-sectional area, the larger the sectional area of the conductor is, the smaller the resistivity of the conductor is, the larger the maximum working current is, and to sum up, under the condition that the conductor material is fixed, the larger the sectional area of the conductor is, the larger the maximum working current is, the larger the sectional area of the conductor is, and the secondary winding in the planar transformer adopts the flat coil with the large section, so that the maximum working current is increased, and the planar transformer can transmit larger power under the condition that the working voltage is stable.

Preferably, the lengths of the lead terminals on the output terminal and the input terminal are different from each other.

By adopting the technical scheme, the input end and the output end can be distinguished by the length of the lead ends on the input end and the output end when the input end and the output end are connected with equipment.

Preferably, the end of the lead terminal extending direction exceeds the plane where the top plate or the bottom plate is located.

Through adopting above-mentioned technical scheme, when planar transformer is connected with the wiring board, the terminal insert the wiring board, and roof or bottom plate and wiring board laminating can play the positioning action.

Preferably, the coil board is a PCB board or a ceramic board.

By adopting the technical scheme, because the coils are stacked in the planar transformer, the distance is small, and in order to ensure that the mutual influence between the coils is as small as possible during working, the adopted coil board has the two characteristics of good heat insulation performance and good insulation performance, so that the coil board can be selected from a PCB board or a ceramic board.

Preferably, the coil plate is provided with an electrical connection hole, the electrical connection hole is positioned at the opposite side of the edge where the coil plate and the through groove are positioned, the electrical connection piece is a contact pin, the contact pin is connected with the coil plate by being inserted into the electrical connection hole, and a first coil is arranged in the coil plate; when the number of the coil plates is larger than one, the first coil is electrically connected with the contact pin in an inserting mode through the electric connecting hole.

By adopting the technical scheme, because the number of turns of a single coil in the coil plate is limited, when the power required by the secondary winding is large, the current in the primary winding is also large, so that the number of turns of the primary winding is increased by connecting the first coils in the plurality of coil plates in series, and the current in the primary winding can be reduced by inputting a larger voltage into the primary winding.

Preferably, at least one of the coil plates has a second coil built therein, and the second coil is used for circuit feedback.

By adopting the technical scheme, the second coil in the coil plate can be used as a feedback coil, and whether the planar transformer fails or not can be monitored in real time by monitoring the voltage at two ends of the feedback coil.

Preferably, the spliceable magnetic core comprises two E-shaped cores that are butted.

Through adopting above-mentioned technical scheme, can piece together the concatenation magnetic core and form by two the same E shape magnetic cores butt joints, only need come a material when the supplied materials can.

Preferably, the spliceable magnetic core comprises an E-shaped magnetic core and an I-shaped magnetic core which are butted.

Through adopting above-mentioned technical scheme, can splice in the magnetic core E shape magnetic core and included bottom plate, whole magnetic column and limit piece, can arrange coil plate and flat coil cover in E shape magnetic core when the installation on, dock I shape magnetic core and E shape magnetic core again, simplify the installation.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the planar transformer can realize the transmission of larger power by adopting the large-section flat coil as a secondary winding;

2. the planar transformer is provided with a feedback coil, so that whether the planar transformer fails or not can be monitored in real time;

3. the lead ends of the planar transformer have a positioning function, and the input end and the output end can be judged according to the length of the lead ends;

4. the planar transformer adopts a magnetic core which can be spliced, and the installation steps can be simplified.

Drawings

Fig. 1 is an isometric view of a planar transformer of specific embodiment 1.

Fig. 2 is a sectional view of a planar transformer according to embodiment 1.

Fig. 3 is a cross-sectional view of a planar transformer according to embodiment 2.

Fig. 4 is an isometric view of a planar transformer of specific embodiment 3.

Fig. 5 is a sectional view of a planar transformer according to embodiment 3.

Description of the reference numerals: 1. the magnetic cores can be spliced; 11. a magnetic column; 12. an edge block; 13. a base plate; 14. a top plate; 2. a coil plate; 21. an electrical connection hole; 22. a through groove; 3. a flat coil; 31. and a lead terminal.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a planar transformer.

Example 1

Referring to fig. 1-2, a planar transformer includes a pancake coil 3, a coil plate 2, and a spliceable core 1.

The magnetic core 1 capable of being spliced comprises a bottom plate 13, a magnetic column 11 arranged in the center of the bottom plate 13, edge blocks 12 arranged on two opposite edges of the bottom plate 13 and a top plate 14, and the magnetic core 1 capable of being spliced can be split into two E-shaped magnetic cores along the middle.

The coil plate 2 is a PCB plate, a coil is arranged in the coil plate, one side of the coil plate 2 is provided with a through groove 22 through which a lead terminal 31 can pass, and the other opposite side is provided with an electric connecting hole 21; the electric connecting hole 21 is inserted with a contact pin, the contact pin and the electric connecting hole 21 form an electric connecting piece, the right middle of the coil plate 2 is also provided with a through hole, and the through hole is adaptive to the magnetic column 11 of the magnetic core 1 and can be spliced.

The input end and the output end of the flat coil 3 are respectively provided with a lead terminal 31, and the lead terminals 31 extend outwards along the vertical direction of the coil plate 2. In addition, the lead terminals 31 have a long length and a short length, and the connection modes can be distinguished by using the difference between the lengths of the two lead terminals 31.

The spliceable magnetic core 1 comprises two E-shaped magnetic cores, the E-shaped magnetic core comprising a bottom plate 13 is arranged on an installation table, a coil plate 2 is sleeved on a magnetic column 11 along a through hole, a flat coil 3 is sleeved on the magnetic column 11 and is stacked with the coil plate 2, the two other E-shaped magnetic cores are spliced, the end part of the extension direction of a lead terminal 31 exceeds the plane where a top plate 14 or the bottom plate 13 is located, the planar transformer is installed in an equipment wiring board, and after the lead terminal 31 is inserted into a wiring hole of the equipment wiring board, the bottom plate 13 or the top plate 14 is attached to the equipment wiring board, so that the positioning effect is achieved; and subsequently fixed by gluing or taping.

After the installation is finished, the flat coil 3 is used as a secondary winding to be electrically connected with an equipment wiring board, one group of coils in the coil plate 2 are connected with a power supply through pins and used as a primary winding, the other group of coils in the coil plate 2 are used as feedback coils and are connected into a feedback circuit through the pins, and the function of monitoring the working state of the planar transformer in real time is achieved.

The implementation principle of the embodiment 1 is as follows: the cross section of the flat coil 3 is large, so that the maximum working current is large, and the planar transformer can complete high-power transmission; when the secondary winding is connected with the equipment, the lead terminal 31 is partially inserted into the equipment wiring board beyond the top plate 14 or the bottom plate 13, and the top plate 14 or the bottom plate 13 is attached to the wiring board, so that the positioning function is realized.

Example 2

Referring to fig. 3, the present embodiment is different from embodiment 1 in that: the components of the spliceable core 1 are different.

Specifically, the magnetic core 1 capable of being spliced comprises an E-shaped magnetic core and an I-shaped magnetic core, wherein a bottom plate 13, a magnetic column 11 and an edge block 12 in the magnetic core 1 capable of being spliced form the E-shaped magnetic core, the I-shaped magnetic core is used as a top plate 14 of the magnetic core 1 capable of being spliced, the coil plate 2 and the flat coil 3 can be sleeved on the E-shaped magnetic core during installation, and then the I-shaped magnetic core is in butt joint with the E-shaped magnetic core.

The implementation principle of the embodiment 2 is as follows: the bottom plate 13, the magnetic column 11 and the side block 12 in the magnetic core 1 capable of being spliced form an E-shaped magnetic core, namely the magnetic column 11 is of an integrated structure, and the coil plate 2 and the flat coil 3 can be directly sleeved on the magnetic column 11 during installation, so that the installation operation is simplified.

Example 3

Referring to fig. 4 to 5, the present embodiment is different from embodiment 1 in that: the coil plate 2 has two pieces.

Specifically, a first coil is arranged in one coil plate 2, and a first coil and a second coil are arranged in the other coil plate 2; when the magnetic pole is installed, the flat coil 3 is clamped by the two coil plates 2, and the three are overlapped and sleeved on the magnetic pole 11; when the transformer works, the first coils in the two coil plates 2 are connected in series in a plug-in mode with the contact pins through the electric connecting holes 21, then a power supply is connected to form a primary winding, the number of turns of the primary winding formed by connecting the first coils in the two coil plates 2 in series is more, the number of turns of the secondary winding is unchanged, and therefore the turn ratio of the primary winding to the secondary winding is improved, voltage reduction in a higher proportion is achieved, and when transmitted power is achieved, the purpose of reducing current in the primary winding can be achieved.

The implementation principle of the embodiment 3 is as follows: the number of primary winding turns is increased in series, and the current in the primary winding is reduced by increasing the input voltage when power is delivered.

Example 4

This example differs from example 2 in that: the material of the coil plate 2 is ceramic.

The ceramic has better heat insulation and insulation effects than a PCB (printed Circuit Board), and is used for separating the flat coil 3 with larger working current from the primary winding, so that the safety of the planar transformer is improved.

The implementation principle of the embodiment 4 is as follows: the safety of the planar transformer is improved by the ceramic material coil plate 2.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A planar transformer, characterized by: the magnetic core splicing type coil comprises a flat coil (3), a coil plate (2) and a magnetic core (1) which can be spliced, wherein the input end and the output end of the flat coil (3) are provided with lead ends (31), the lead ends (31) extend outwards along the vertical direction of the coil plate (2), the coil plate (2) is connected with an electric connector, a through hole is formed in the middle of the coil plate (2), one side of the coil plate (2) is provided with a through groove (22), and the lead ends (31) can pass through the through groove (22); the magnetic core (1) capable of being spliced comprises a bottom plate (13), a magnetic column (11) arranged in the center of the bottom plate (13), and edge blocks (12) and a top plate (14) arranged on two opposite edges of the bottom plate (13), wherein the flat coil (3) is wound on the magnetic column (11), the magnetic column (11) penetrates through the coil plate (2) along the through hole, the flat coil (3) and the coil plate (2) are stacked in a layered mode, and the edge blocks (12), the top plate (14) and the bottom plate (13) clamp the flat coil (3) and the coil plate (2) in a wrapping mode.

2. A planar transformer according to claim 1, wherein: the lengths of the lead terminals (31) on the output terminal and the input terminal are different.

3. A planar transformer according to claim 1, wherein: the end part of the extending direction of the lead terminal (31) exceeds the plane of the top plate (14) or the bottom plate (13).

4. A planar transformer according to claim 1, wherein: the coil plate (2) is a PCB plate or a ceramic plate.

5. A planar transformer according to claim 1, wherein: the coil plate (2) is provided with an electric connecting hole (21), the electric connecting hole (21) is located on the opposite side of the edge where the coil plate (2) and the through groove (22) are located, the electric connecting piece is a contact pin, the contact pin is connected with the coil plate (2) through being inserted into the electric connecting hole (21), and a first coil is arranged in the coil plate (2); when the number of the coil plates (2) is larger than one, the first coil is electrically connected with the contact pins in an inserting mode through the electric connecting holes (21).

6. A planar transformer according to claim 5, wherein: at least one coil plate (2) is internally provided with a second coil, and the second coil is used for circuit feedback.

7. A planar transformer according to claim 1, wherein: the spliceable magnetic core (1) comprises two E-shaped magnetic cores which are butted.

8. A planar transformer according to claim 1, wherein: the spliceable magnetic core (1) comprises an E-shaped magnetic core and an I-shaped magnetic core which are butted.