CN217214403U - Planar transformer coil structure - Google Patents

Abstract

The utility model provides a be applied to transformer technical field's planar transformer coil structure. The utility model discloses a planar transformer coil structure, can form planar transformer coil through half circle or a circle copper foil coil welding, swiftly realize the coiling of transformer coil, adapt to the high frequency, the winding of transformer coil is swift, high current and more complicated structure of the planar coil.

Description

Planar transformer coil structure

Technical Field

The utility model belongs to the technical field of the transformer, more specifically say, relate to a planar transformer coil structure.

Background

With the development of science and technology, novel magnetic cores are developed rapidly, especially the development of planar magnetic cores attracts attention, and compared with general magnetic core transformers, the planar transformer and the inductor have the advantages of greatly reduced overall dimensions, high current density, high power, good heat dissipation, low leakage inductance, high efficiency, low cost, good coupling, wide working frequency and the like, so that the planar transformer and the inductor are widely applied to the technical fields of communication, aerospace, digital cameras, computers and the like, the size of a circuit board is greatly reduced, and a certain effect is achieved for promoting the development of the electronic industry.

Planar transformer coils include structural style such as copper foil is folding, flat line is found around, printed board coil, and these structural style coils all have certain limitation, for example: when the copper foil folding coil is designed, the structure is single and comprises a ring shape or a square shape, the thickness of the coil folding position is thicker, when the number of turns is more, the thickness of the coil is increased, the utilization rate of a window is reduced, and the insulation treatment difficulty is higher; due to the limitation of the width-thickness ratio of the vertical winding form of the flat wire, when the frequency is high, the thickness of the flat wire is small, and the winding of the coil is difficult to realize; due to the limitation of the copper-clad thickness of the printed board, when the current is large, the coil is difficult to manufacture. Therefore, when a designer encounters high frequency, large current and complex coil structure, the above structural form hardly meets the technical requirements of the transformer.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that: the planar transformer coil structure is simple in structure, can be welded by a half-turn or one-turn copper foil coil to form a planar transformer coil, is convenient and quick to wind the transformer coil, is convenient to prepare, is good in reliability, and effectively adapts to high-frequency and large-current planar coils with complex structures.

To solve the technical problem, the utility model discloses the technical scheme who takes does:

the utility model relates to a planar transformer coil structure, planar transformer coil structure include half circle coil, half circle coil includes half circle coil A, half circle coil B, set up coil A kink A and coil A kink B on the half circle coil A, coil A kink A and coil A kink B buckle opposite direction, set up coil B kink A and coil B kink B on the half circle coil B, coil B kink A and coil B kink B buckle opposite direction, set up the connection step on the coil A kink B, coil B kink A upper surface and coil B kink B lower surface set up the connection step respectively.

One connecting step of the half-turn coil B of the planar transformer coil structure is welded with one connecting step of the other half-turn coil B, one connecting step of the half-turn coil B3 positioned at the top is welded with one connecting step of the half-turn coil A, and one connecting step of the half-turn coil B positioned at the bottom is welded with one connecting step of the other half-turn coil A.

And the surfaces of the half-turn coil A and the half-turn coil B are electroplated to form an electroplated layer.

The two half-turn coils which are mutually connected form a coil component, the upper and lower multi-layer coil components form a transformer coil, and the connecting steps of the two half-turn coils which are mutually connected are in lap joint.

The height of the connecting step of the half-turn coil is equal to half of the thickness of the half-turn coil, and welding process holes are respectively formed in the half-turn coil A and the half-turn coil B.

And an insulating sheet is arranged between adjacent coil assemblies, and a gap is arranged on the insulating sheet.

The insulating sheet is formed by stamping and processing DuPont paper or a polyimide film.

The planar transformer coil structure also comprises a magnetic core and a secondary coil, wherein the part of the secondary coil except the lead-out part is coated with an assembly welding film layer, and the secondary coil and a transformer coil formed by an upper layer coil assembly and a lower layer coil assembly are inserted on the magnetic core.

The connecting steps of the two half-turn coils which are connected with each other are connected by tin soldering.

And a coil framework is also arranged between the transformer coil and the magnetic core.

Adopt the technical scheme of the utility model, can obtain following beneficial effect:

planar transformer coil structure, to being not enough among the prior art, based on unique ingenious design, provide improvement scheme. When carrying out transformer coil preparation, at first carry out tinning respectively with the connection step of the half turn coil in figure 1 and figure 2, then weld different half turn coils, two half turn coils form a coil pack, a plurality of coil packs form transformer coil, then need be at the coil pack position veneer insulating piece that has welded, guarantee central symmetry, the edge distance of insulating piece and coil is unanimous, then fill up coil pack from a left side right side in proper order with the insulating piece of figure 4, the direction of filling up coil pack is from up down, the insulating piece order is with fill up into the direction and not allow the mistake, the breach position of guaranteeing every layer of insulating piece exists the overlapping, guarantee to insulate. All the insulating sheets are positioned by the mold core, and then are clamped by a ticket clamp or a tool to be dipped so as to fix the coil and increase the insulating property. And (5) overlapping the secondary side coils according to requirements, and wrapping the coils by using an insulating tape for fixing. And sequentially sleeving the coils on the framework, then loading the coils into the magnetic core, adhering and fixing the magnetic core by glue, then protecting the leading-out head part, and performing vacuum impregnation treatment to further improve the insulating property. According to the structure, the planar transformer coil is formed by welding half-turn coils, and the processing step is half of the thickness of the copper foil, so that the thickness after splicing welding is consistent with the thickness of the copper foil, the height of the coil can be effectively reduced, the utilization rate of a magnetic core window is improved, and the power density of the transformer is improved; the half-turn coil welding structure has certain universality, the number of turns of the coil can be adjusted by increasing or decreasing the number of half-turn coils, the transformation ratio of the transformer is changed, the design of transformers with various frequencies can be adapted by adjusting the thickness of copper foil or in a parallel connection mode, the coil structure can be adjusted according to the design requirement, the limitation of the shape, the width-thickness ratio and the thickness of the coil is avoided, and the half-turn coil welding structure is particularly suitable for the design of high-frequency and high-current planar transformers; the utility model discloses a three kinds of insulation mode carry out insulation processing, at first half circle coil or a circle coil upper and lower surface are scribbled the one deck resistance welding membrane, then the one deck insulating piece has been piled up between every turn, the insulating piece adopts dupont paper or polyimide film to dash machine-shaping, the insulating piece is through specific order of filling in, the requirement of insulating and intergroup insulation between turns has been guaranteed, last coil passes through flooding treatment fixed coil and insulating piece, it is insulating to improve, can also be through flooding many times, make in the gap between coil and insulating piece is filled up to the insulating varnish, great improvement compressive property. The utility model discloses an in the planar transformer assembling process, can carry out the assembly of sandwich formula, coil from the top down is former limit, secondary in proper order, the assembly form on former limit promptly, can reduce distribution parameter, also can be through parallel connection design, further reduces distribution parameter. Planar transformer coil structure, can form planar transformer coil through half circle or a circle copper foil coil welding, convenient and fast realizes transformer coil's coiling, preparation is convenient, good reliability, effectively adapts to high frequency, heavy current and more complex structure's planar coil.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic structural diagram of a half-turn coil a of a planar transformer coil structure according to the present invention;

fig. 2 is a schematic structural diagram of a half-turn coil B of the planar transformer coil structure according to the present invention;

fig. 3 is a schematic structural diagram of a planar transformer coil structure according to the present invention when a half-turn coil forms a transformer coil;

fig. 4 is a schematic structural diagram of an insulating sheet of the planar transformer coil structure according to the present invention;

fig. 5 is a schematic structural diagram of the planar transformer coil structure according to the present invention when the insulating sheet is connected to the transformer coil;

fig. 6 is a schematic structural view of a secondary coil of the planar transformer coil structure according to the present invention;

fig. 7 is a schematic diagram of the overall structure of the planar transformer coil structure according to the present invention;

in the drawings, the symbols are respectively: 1. a half turn coil; 2. a half turn coil A; 3. a half turn coil B; 4. a coil A bending part B; 5. a coil B is bent at part A; 6. a coil B bent part B; 7. connecting steps; 8. a coil assembly; 9. an insulating sheet; 10. a notch; 11. a magnetic core; 12. a secondary coil; 13. a lead-out portion; 14. a transformer coil; 15. welding a fabrication hole; 16. a coil A bending part A; 17. half turn coil weld locations.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes, structures, mutual positions and connection relations of the components, the functions and operation principles of the components, and the like:

as shown in fig. 1-7, the utility model relates to a planar transformer coil structure, planar transformer coil structure include half circle coil 1, half circle coil 1 includes half circle coil A2, half circle coil B3, set up coil A kink A16 and coil A kink B4 on half circle coil A2, coil A kink A16 and coil A kink B4 opposite bending direction, set up coil B kink A5 and coil B kink B6 on half circle coil B3, coil B kink A5 and coil B kink B6 opposite bending direction, set up connection step 7 on coil A kink B4, coil B kink A5 upper surface and coil B kink B6 lower surface set up connection step 7 respectively. The structure provides an improved scheme based on unique and ingenious conception aiming at the defects in the prior art. When carrying out transformer coil preparation, at first carry out tinning respectively with the connection step of the half turn coil in figure 1 and figure 2, then weld different half turn coils, two half turn coils form a coil pack, a plurality of coil packs form transformer coil, then need be at the coil pack position veneer insulating piece that has welded, guarantee central symmetry, the edge distance of insulating piece and coil is unanimous, then fill up coil pack from a left side right side in proper order with the insulating piece of figure 4, the direction of filling up coil pack is from up down, the insulating piece order is with fill up into the direction and not allow the mistake, the breach position of guaranteeing every layer of insulating piece exists the overlapping, guarantee to insulate. All the insulating sheets are positioned by the mold core, and then are clamped by a ticket clamp or a tool to be dipped so as to fix the coil and increase the insulating property. And (5) overlapping the secondary side coils according to requirements, and wrapping the coils by using an insulating tape for fixing. And sleeving the coils on the framework in sequence, then loading the coils into the magnetic core, adhering and fixing the magnetic core by adopting glue, then protecting the leading-out head part, and carrying out vacuum impregnation treatment to further increase the insulating property. According to the structure, the planar transformer coil is formed by welding half-turn coils, and the processing step is half of the thickness of the copper foil, so that the thickness after splicing welding is consistent with the thickness of the copper foil, the height of the coil can be effectively reduced, the utilization rate of a magnetic core window is improved, and the power density of the transformer is improved; the half-turn coil welding structure has certain universality, the number of turns of the coil can be adjusted by increasing or decreasing the number of half-turn coils, the transformation ratio of the transformer is changed, the design of transformers with various frequencies can be adapted by adjusting the thickness of copper foil or in a parallel connection mode, the coil structure can be adjusted according to the design requirement, the limitation of the shape, the width-thickness ratio and the thickness of the coil is avoided, and the half-turn coil welding structure is particularly suitable for the design of high-frequency and high-current planar transformers; the utility model discloses a three kinds of insulation mode carry out insulation processing, at first half circle coil or a circle coil upper and lower surface are scribbled the one deck resistance welding membrane, then the one deck insulating piece has been piled up between every turn, the insulating piece adopts dupont paper or polyimide film to dash machine-shaping, the insulating piece is through specific order of filling in, the requirement of insulating and intergroup insulation between turns has been guaranteed, last coil passes through flooding treatment fixed coil and insulating piece, it is insulating to improve, can also be through flooding many times, make in the gap between coil and insulating piece is filled up to the insulating varnish, great improvement compressive property. The utility model discloses an among the planar transformer assembling process, can carry out the assembly of sandwich formula, coil from the top down is the assembly form on former limit, secondary, former limit in proper order promptly, can reduce distribution parameter, also can further reduce distribution parameter through parallel design. Planar transformer coil structure, simple structure can form planar transformer coil through half circle or a circle copper foil coil welding, convenient and fast realizes transformer coil's coiling, the preparation is convenient, the good reliability to effectively adapt to high frequency, heavy current and more complex structure's planar coil.

One connecting step 7 of the half-turn coil B3 of the planar transformer coil structure is welded with one connecting step 7 of the other half-turn coil B3, one connecting step 7 of the uppermost half-turn coil B3 is welded with one connecting step 7 of one half-turn coil A2, and one connecting step 7 of the lowermost half-turn coil B3 is welded with one connecting step 7 of the other half-turn coil A2. The half-turn coil A2 and the half-turn coil B3 are both formed by processing copper foils, and electroplating is performed on the surfaces of the half-turn coil A2 and the half-turn coil B3 to form electroplated layers. Two half-turn coils 1 connected with each other form a coil assembly 8, the upper and lower multi-layer coil assemblies 8 form a transformer coil 14, and the connecting steps 7 of the two half-turn coils 1 connected with each other are connected in an overlapping manner. The height of the connecting step 7 of the half-turn coil 1 is equal to half of the thickness of the half-turn coil 1, and welding process holes 15 are respectively arranged on the half-turn coil A2 and the half-turn coil B3. According to the structure, when the transformer coil is formed, the coil assembly is sequentially welded from bottom to top by positioning through the welding process holes, the bottom of each layer of the coil assembly needs to be covered with a layer of heat insulation film during welding, welding spots below the coil assembly are prevented from being melted, if the welding spots are too high or burrs exist, filing can be conducted, then welding is continued until the coil assembly reaches the specified number of turns, and finally the last half-turn coil is welded.

An insulating sheet 9 is arranged between adjacent coil assemblies 8, and a gap 10 is arranged on the insulating sheet 9.

The insulating sheet 9 is formed by stamping dupont paper or polyimide film.

The planar transformer coil structure further comprises a magnetic core 11 and a secondary coil 12, wherein the secondary coil 12 except for the lead-out part 13 is coated with an assembly welding film layer, and a transformer coil 14 formed by the secondary coil 12 and the upper and lower multilayer coil assemblies 8 is inserted on the magnetic core 11.

The connecting steps 7 of the two half-turn coils 1 connected with each other are connected by soldering.

A coil frame is also arranged between the transformer coil 14 and the magnetic core 11.

The coil structure of the planar transformer of the utility model, fig. 1 is a half-turn coil A (coil starting end half-turn coil), one end of the half-turn coil A without the connecting step 7 is a leading-out section, and one end of the half-turn coil A with the connecting step 7 is a welding end for welding with a welding boss of a half-turn coil B; FIG. 2 is a half-turn coil B, wherein two ends of the half-turn coil B are respectively provided with a connecting step 7, one end of each connecting step is arranged on the front side, the other end of each connecting step is arranged on the back side, the height of each connecting step is half of the thickness of the half-turn coil B, and after each connected half-turn coil is spliced and welded, the height of each connecting step 7 is consistent with the thickness of a half-turn coil 1 made of copper foil, so that the height of each coil is ensured; each half-turn coil is provided with a plurality of welding process holes 15 which can be used for welding and positioning coil components, and the schematic diagram after the process holes are positioned and welded is shown in figure 3; preferably, the half-turn coils in fig. 1 and 2 are processed by copper foil, and are electroplated to increase weldability, besides the welding position, the upper and lower parts of the coil can be coated with solder resist or insulating varnish to increase insulation, and each half-turn coil is connected by soldering. Fig. 4 is an insulating sheet (coil insulating sheet) schematic diagram, and the breach is cut out respectively to the breach 10 position of insulating sheet, then in the coil that down fills up into in fig. 3 from last in proper order, because the position of breach is different, all can have the lap between filling in every layer of insulating sheet of coil, and this lap can effectually guarantee to be insulating, avoids turn-to-turn short circuit. Fig. 4 is a schematic view of the coil of fig. 3 after the insulating sheet is inserted therein. As preferred, the insulating piece adopts dupont paper or polyimide film punching machine shaping, and breach 10 adopts the scissors to cut open, and insulating piece outer lane size slightly is greater than coil overall dimension, and the inner circle size slightly is less than coil inner circle size, and specific size can design according to the insulating requirement, reserves certain margin distance, can effectual assurance turn-to-turn and intergroup be insulating. FIG. 6 is a diagram of secondary windings, which can be stacked in multiple groups according to the transformer frequency, and each group of secondary windings is coated with a layer of assembly welding film except for the lead-out portion, so as to effectively insulate to ensure high frequency use. The primary winding of fig. 5 and the secondary winding of fig. 6 are placed in the core 11, and the assembly is completed as shown in fig. 7, both between the groups and insulated from the insulating sheet on the core spacers. Preferably, the transformer assembly adopts sandwich type assembly, namely a primary side, a secondary side and a primary side are sequentially assembled, distribution parameters are reduced, a framework is added between the interior of a coil and a magnetic core, insulation paint is filled in gaps between turns and groups through multiple times of vacuum impregnation, insulation can be greatly increased, and the magnetic core coil is fixed.

Planar transformer coil structure, to being not enough among the prior art, based on unique ingenious design, provide improvement scheme. When carrying out transformer coil preparation, at first carry out tinning respectively with the connection step of the half turn coil in figure 1 and figure 2, then weld different half turn coils, two half turn coils form a coil pack, a plurality of coil packs form transformer coil, then need be at the coil pack position veneer insulating piece that has welded, guarantee central symmetry, the edge distance of insulating piece and coil is unanimous, then fill up coil pack from a left side right side in proper order with the insulating piece of figure 4, the direction of filling up coil pack is from up down, the insulating piece order is with fill up into the direction and not allow the mistake, the breach position of guaranteeing every layer of insulating piece exists the overlapping, guarantee to insulate. All the insulating sheets are positioned by the mold core, and then are clamped by a ticket clamp or a tool to be dipped so as to fix the coil and increase the insulating property. And (5) overlapping the secondary side coils according to requirements, and wrapping the coils by using an insulating tape for fixing. And sleeving the coils on the framework in sequence, then loading the coils into the magnetic core, adhering and fixing the magnetic core by adopting glue, then protecting the leading-out head part, and carrying out vacuum impregnation treatment to further increase the insulating property. According to the structure, the planar transformer coil is formed by welding half-turn coils, and the processing step is half of the thickness of the copper foil, so that the thickness after splicing welding is consistent with the thickness of the copper foil, the height of the coil can be effectively reduced, the utilization rate of a magnetic core window is improved, and the power density of the transformer is improved; the half-turn coil welding structure has certain universality, the number of turns of the coil can be adjusted by increasing or decreasing the number of half-turn coils, the transformation ratio of the transformer is changed, the design of transformers with various frequencies can be adapted by adjusting the thickness of copper foil or in a parallel connection mode, the coil structure can be adjusted according to the design requirement, the limitation of the shape, the width-thickness ratio and the thickness of the coil is avoided, and the half-turn coil welding structure is particularly suitable for the design of high-frequency and high-current planar transformers; the utility model discloses a three kinds of insulation mode carry out insulation processing, at first half circle coil or a circle coil upper and lower surface are scribbled the one deck resistance welding membrane, then the one deck insulating piece has been piled up between every turn, the insulating piece adopts dupont paper or polyimide film to dash machine-shaping, the insulating piece is through specific order of filling in, the requirement of insulating and intergroup insulation between turns has been guaranteed, last coil passes through flooding treatment fixed coil and insulating piece, it is insulating to improve, can also be through flooding many times, make in the gap between coil and insulating piece is filled up to the insulating varnish, great improvement compressive property. The utility model discloses an among the planar transformer assembling process, can carry out the assembly of sandwich formula, coil from the top down is the assembly form on former limit, secondary, former limit in proper order promptly, can reduce distribution parameter, also can further reduce distribution parameter through parallel design. Planar transformer coil structure, can form planar transformer coil through half a turn or a circle copper foil coil welding, convenient and fast realizes transformer coil's coiling, the preparation is convenient, the good reliability effectively adapts to high frequency, heavy current and more complex construction's planar coil.

The present invention has been described in detail with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and the present invention can be implemented in various ways without modification, and the present invention is not limited by the above embodiments.

Claims (10)

1. A planar transformer coil structure, characterized in that: planar transformer coil structure include half circle coil (1), half circle coil (1) includes half circle coil A (2), half circle coil B (3), set up coil A kink A (16) and coil A kink B (4) on half circle coil A (2), coil A kink A (16) and coil A kink B (4) opposite direction of buckling, set up coil B kink A (5) and coil B kink B (6) on half circle coil B (3), coil B kink A (5) and coil B kink B (6) opposite direction of buckling, set up on coil A kink B (4) and connect step (7), coil B kink A (5) upper surface and coil B kink B (6) lower surface set up respectively and connect step (7).

2. The planar transformer coil structure of claim 1, wherein: the planar transformer coil structure is characterized in that one connecting step (7) of one half-turn coil B (3) is welded with one connecting step (7) of the other half-turn coil B (3), one connecting step (7) of the half-turn coil B (3) positioned at the top is welded with one connecting step (7) of one half-turn coil A (2), and one connecting step (7) of the half-turn coil B (3) positioned at the bottom is welded with one connecting step (7) of the other half-turn coil A (2).

3. Planar transformer coil structure according to claim 1 or 2, characterized in that: the half-turn coil A (2) and the half-turn coil B (3) are both formed by processing copper foils, and the surfaces of the half-turn coil A (2) and the half-turn coil B (3) are both subjected to electroplating treatment to form electroplated layers.

4. The planar transformer coil structure of claim 2, wherein: two half-turn coils (1) which are connected with each other form a coil component (8), the upper and lower multi-layer coil components (8) form a transformer coil (14), and the connecting steps (7) of the two half-turn coils (1) which are connected with each other are in lap joint.

5. Planar transformer coil structure according to claim 1 or 2, characterized in that: the height of the connecting step (7) of the half-turn coil (1) is equal to half of the thickness of the half-turn coil (1), and welding process holes (15) are respectively formed in the half-turn coil A (2) and the half-turn coil B (3).

6. The planar transformer coil structure of claim 4, wherein: an insulating sheet (9) is arranged between the adjacent coil assemblies (8), and a gap (10) is arranged on the insulating sheet (9).

7. The planar transformer coil structure of claim 6, wherein: the insulating sheet (9) is formed by stamping and processing DuPont paper or a polyimide film.

8. The planar transformer coil structure of claim 4, wherein: the planar transformer coil structure further comprises a magnetic core (11) and a secondary coil (12), wherein the position of the secondary coil (12) except for the lead-out part (13) is coated with an assembly welding film layer, and a transformer coil (14) formed by the secondary coil (12) and the upper and lower multilayer coil assemblies (8) is inserted on the magnetic core (11).

9. The planar transformer coil structure of claim 4, wherein: the connecting steps (7) of the two half-turn coils (1) which are connected with each other are connected by soldering.

10. The planar transformer coil structure of claim 8, wherein: a coil framework is further arranged between the transformer coil (14) and the magnetic core (11).

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