TWM480152U - Modular planar coil and planar transformer using the same - Google Patents

Abstract

Disclosed are a modular planar coil and a planar transformer using the modular planar coil. The modular planar coil includes a first planar coil, a second coil and connecting part connecting both coils. Each planar coil comprises an outer coil and an inner coil electrically connected in series at the same plan. The two coils are connected in series by the connecting part at their inner coil. The two planar coils are prepared in two adjacent plans separated by a distance. The outer coil of each planar coil ends at a free terminal, which is positioned at a pad position and a connection position, respectively.

Description

Modular planar coil and planar transformer including the same

This creation relates to a modular planar coil, and more particularly to a planar coil module for use in a planar transformer. The present invention provides a multi-layer, multi-turn planar coil that is modular in design and facilitates connection to other planar coils. This creation also reveals a planar transformer using this planar coil.

Transformers are an important component in the supply of electronic products. The conventional transformer is bulky and cannot meet the requirements for miniaturization of the product. A planar transformer (a planar transformer) is a transformer in which a conductive foil such as a copper foil is laid on a multilayer printed circuit board (PCB) as a winding, and the thickness of the transformer can be greatly reduced. Planar transformers are widely used in communications, computers, industrial control, aerospace engineering, medical equipment and other products. However, because flat-panel transformers require a relatively large number of boards, they are still large. And because the efficiency is not high, the output impedance is also large, and it is easy to generate noise. How to achieve a thinner and more efficient planar transformer has become a technical problem that needs to be overcome in this industry.

Taiwan Patent No. I387981 discloses a planar transformer comprising only a single printed circuit board. However, the single printed circuit board includes a plurality of primary circuit layers, a plurality of secondary circuit layers, and via holes for mounting the magnetic core. This patent makes most of the winding layers on a multilayer substrate. On the whole, a single printed circuit board is formed to reduce the thickness. However, the structure is the same as that of a planar transformer formed using a multilayer printed circuit board.

Taiwan invention patent I357086 provides a transformer suitable for being deployed in a line Inside the substrate. The transformer includes a first planar coil and a second planar coil, wherein the first planar coil has a plurality of first windings and the second planar coil has a plurality of second windings. At least two adjacent first windings constitute a first winding bundle. At least two adjacent second windings constitute a second winding bundle. The two cross each other, thereby reducing the number of layers of the planar coil.

Chinese invention patent CN 103081044A discloses a planar transformer having Multi-layer single-layer, single-turn wire-wound boards, combined with different winding boards, form different types of planar transformers according to different needs.

European patent EP 2 602 801 A1 discloses a planar transformer having a majority A layer, single-turn wound metal plate is used as a secondary winding to be combined with the primary winding.

German patent DE 10 2012 003 365 A1 discloses a planar transformer Use a spiral metal strip as the winding. The scroll metal strip is a single layer, multi-turn design. The end of the inner ring of the winding is bent through the insulating plate to another plane.

European patent EP 2 637 183 A2 discloses a planar transformer using a single layer The coil bobbin acts as a coil. The bobbin is stretched out of the shape of a pad to serve as a layer-to-layer and connection electrode to the outside.

US Patent Publication No. 2013-278371A1 discloses a planar transformer, used Most single-layer planar metal windings, and most metal windings are connected and positioned in series with terminals to achieve multi-layer winding.

Patent Cooperation Treaty Patent No. WO 0070926A1 also discloses a planar transformation A multi-layer, single-turn bobbin made of continuous material. The tongues in the shape of a pad are connected in series between the layers.

According to the technical status of planar transformers, the industry is small for planar transformers. It can be said that it has spared no effort in development. However, it is still difficult to get rid of the know-how of making planar transformers with printed circuit boards. The proposed design uses a single-layer wound plate as a combined unit, and it is impossible to propose a design that truly achieves multi-turn winding. Furthermore, although there are specific known techniques for designing a plurality of winding plates in series, the connection method is fixed, and only a specific winding plate structure can be provided for a specific number of layers or turns of the winding plate module application. . It does not have a modular design and cannot be combined or extended according to the needs of the use.

The purpose of this creation is to provide a modular multi-layer, multi-turn planar coil.

Another object of the present invention is to provide a planar coil that is easy to change the number of layers and the number of turns of a planar coil in response to different needs in use.

The purpose of this creation is to provide a planar transformer using a modular planar coil.

The purpose of this creation is to provide a planar coil that is simple to manufacture and suitable for surface mount mounting and a planar transformer using the planar coil.

The modular planar coil according to the present invention is a planar coil assembly including a first planar coil, a second planar coil, and a connecting portion for electrically connecting the first planar coil and the second planar coil . The first planar coil and the second planar coil each include an outer ring and an inner ring that are electrically connected in series, and maintain a distance from each other, and the connecting portion is electrically connected to the inner ring of the two planar coils. The first planar coil and the second planar coil are located on two adjacent planes, and Keep a distance. The first planar coil and the outer ring of the second planar coil extend away from one end of the inner ring to form a pad. Wherein the pad of the first planar coil is located at a first position on the outer circumference of the imaginary geometric figure including the two planar coil region, and the pad of the second planar coil is located on the outer periphery of the geometric figure, away from the first position Second position. The two pads extend in the height direction to the same height or different heights.

In a preferred embodiment of the present invention, the geometric pattern includes the two planar coil regions A rectangle of the field. In other embodiments, the geometry is a polygon or circle that includes the two planar coil regions.

In a preferred embodiment of the present invention, the planar coil assembly may further comprise an insulation a sheet between the first planar coil and the second planar coil. The insulating sheet forms a port for the connecting portion to be inserted.

In some examples of the present creation, the first planar coil, the second planar coil Forming a continuous material with the joint. In other examples, the first planar coil and the second planar coil are separately fabricated and connected by the joint. In such an example, the joint may be a welding consumable or a viscous conductive material.

In some examples of the present creation, the first planar coil and the second planar coil Form a scroll. In this example, the inner circumference and the outer circumference of the first planar coil and the second planar coil are each formed substantially one week. In other examples of the present invention, the first planar coil and the second planar coil form a rectangular outline, such as a multiple rectangular shape that lies in the same plane, or a multiple square that is in the same plane. In this example, the inner circumference and the outer circumference of the first planar coil and the second planar coil are each formed substantially one week.

Another aspect of this creation is to provide a planar coil module, including two The aforementioned planar coil assembly of the present invention, wherein the pad of the first planar coil of the second planar coil assembly is located at a second position on the outer circumference of the geometric pattern, and the pad of the second planar coil is located on the outer circumference of the geometric pattern. Leaving the third position of the first and second positions. The two sets of planar coil assemblies are electrically connected at the second position.

A planar transformer using the modularized planar coil of the present invention may include the first A planar coil assembly, another planar coil assembly (third planar coil module) stacked with the first planar coil assembly, and a core. The core extends perpendicular to the plane of the two planar coil assembly and passes through a central portion of the two planar coil assembly. The third planar coil module includes at least one planar coil. The planar transformer may further include a metal casing covering the core and the coil portion of the two planar coil assembly.

In an embodiment of the present invention, the planar transformer may further include the first plane The coil assembly is coupled to the second planar coil assembly in the second position. Also included may be stacked with the first and second planar coil assemblies, another planar coil assembly (fourth planar coil assembly). The fourth planar coil module includes at least one planar coil. In such an embodiment, at least one of the third planar coil assembly and the fourth planar coil assembly is sandwiched between the first and second planar coil assemblies.

The above and other objects and advantages of the present invention will become more apparent from the following detailed description.

1‧‧‧ planar transformer

10‧‧‧First planar coil assembly

11, 12‧‧‧ pads

13‧‧‧First plane coil

131, 141‧‧ ‧ outer ring

132, 142‧‧ inner circle

14‧‧‧Second plane coil

15‧‧‧Connecting Department

16‧‧‧Insulation sheet

17‧‧‧Incision

18‧‧‧ holes

20‧‧‧Second planar coil assembly

21, 22‧‧‧ pads

231, 241‧‧ ‧ outer ring

232, 242‧‧ inner circle

30‧‧‧First coil plate

40‧‧‧second coil plate

50‧‧‧third coil plate

60‧‧‧fourth coil plate

70‧‧‧ iron core

71‧‧‧Upper casing

72‧‧‧ Lower case

73, 74, 75, 7677, 78, 79‧‧‧ insulation boards

P1‧‧‧ first position

P2‧‧‧ second position

P3‧‧‧ third position

Fig. 1 is a schematic view showing the structure of a planar transformer using the present modularized planar coil.

Figure 2 is a perspective view showing an embodiment of the modularized planar coil of the present invention.

Figure 3 is a perspective view showing another embodiment of the modularized planar coil of the present invention.

Fig. 4 is a schematic view showing an example of the connection mode of the modularized planar coil of the present creation.

Several embodiments of the modularized planar coil of the present creation are described below in accordance with the drawings. It should be noted, however, that the description of the present embodiment is merely illustrative of the basic architecture and possible applications of the modularized planar coil of the present invention, and is not intended to limit the scope of the present invention.

Fig. 1 is a schematic view showing the structure of a planar transformer using the present modularized planar coil. As shown in the figure, in this embodiment, the planar transformer 1 includes an upper casing 71, an insulating plate 73, a first coil plate 30, an insulating plate 74, and a first planar coil assembly from above to below. 10. The insulating plate 75, the second coil plate 40, the insulating plate 76, the third coil plate 50, the insulating plate 77, the second planar coil assembly 20, the insulating plate 78, the fourth coil plate 60, the insulating plate 79, and the lower casing 72, and a core 70 passing through each of the coils and the central portion of the insulating plate. In this configuration, the first coil plate 30, the second coil plate 40, the third coil plate 50, and the fourth coil plate 60 are sequentially connected in series as a secondary side coil. The first planar coil assembly 10 is connected in series with the second planar coil assembly 20 as a primary side coil. Of course, in this configuration, the primary side coil and the secondary side coil can be interchanged. For the sake of explanation, the first planar coil assembly 10 and/or the second planar coil assembly 20 are referred to as "primary coils", and the first coil plate 30 and the second coil plate 40 are referred to as "secondary coils". All or one of the third coil plate 50 and the fourth coil plate 60. Therefore, in the following description, the "primary side coil" and the "secondary side coil" are interchangeable and common concepts.

The figure shows that the primary side coil uses two sets of planar coil assemblies 10, 20 having a double-layer, double-ring configuration. The secondary side coil uses four sets of single layer, single turn coil plates. However, it is known in the industry that the secondary side coil can also use any number of planar coil assemblies, or a flat coil assembly can be used with a single layer coil plate. The number of coils on each side used is not limited to this implementation. As shown in the example. For example, only one set of planar coil assemblies (primary side) and one or two sets of single layer coil plates (secondary side) may be used. It is also possible to use two sets of planar coil assemblies (primary side) and one or two sets of single layer coil plates (secondary side). However, in order to improve the efficiency, it is preferable to overlap the primary side coil and the secondary side coil. An insulating plate may be used for insulation between the coils, but it may be insulated by other means, for example, with an insulating layer formed on the surface of the coil. The material of the insulating sheet or the insulating layer may be any commercially available insulating material as long as it is suitable for processing and provides a good insulating effect. If an insulating sheet is used, the thickness should not be too thick, but it should not be too thin to cause damage and its insulating effect and fixing function.

In the above structure, the secondary side coil plates 30, 40, 50, 60 can be utilized What is the appropriate way to connect in series. The primary side planar coil assemblies 10, 20 are two examples of the inventive modular coil assembly. The figure shows that the planar coil modules 10, 20 have two pads 11, 12 and 21, 22 (see Figures 2 and 3) extending beyond the module. The four sets of coil plates 30, 40, 50, 60 also have two pads extending out of the module, and the pads 11, 12, 21, 22 of the planar coil modules 10, 20 are located on opposite sides. However, whether the pads of the two side coils are placed on opposite sides is not a technical limitation.

After the above components are combined, a set of transformers 1 is formed. Wherein, the upper casing The lower casing 72 covers the core 70 and the coil portions of the planar coil modules 10, 20 and the coil plates 30, 40, 50, 60, respectively. In addition to protecting the transformer 1, it also provides the function of an electromagnetic wave barrier. The pads 11, 21, 22 of the planar coil modules 10, 20 (see Figures 2-3) and the pads of the coil plate provide the possibility that the transformer 1 can be surface-mounted and assembled on a circuit board.

In the embodiment of the present invention, the planar coil mold assembly 10, 20 and the coil plate 30, 40, 50, and 60 are all made of materials with good conductivity. Suitable materials include various metals or alloys such as copper, silver, brass, and the like. The material, shape and size of the core 70 can be applied according to the application. The requirements are selected from known technologies. The materials, shapes and dimensions of the upper and lower casings 71, 72 can also be selected from known techniques depending on the application requirements. Further, the housing is not limited to the manner in which the lower housings are combined. It is also possible to make the housing from a single material or to combine more than two components. If necessary, the housing of one of the sides or the number of layers of one of the housings may be omitted. All of these are within the scope of known technology and need not be described here.

Figure 2 is a perspective view showing an embodiment of the modularized planar coil of the present invention. Such as The modular planar coil shown in the figures is formed into a planar coil assembly 10. The planar coil assembly 10 includes a first planar coil 13 , a second planar coil 14 , and a joint portion 15 . The first planar coil 13 and the second planar coil 14 are located in two adjacent planes, maintaining a certain distance from each other. In this embodiment, the first planar coil 13, the second planar coil 14 and the connecting portion 15 are made of a continuous material. The first planar coil 13 and the second planar coil 14 and the connecting portion 15 are made of a material having good conductivity. Suitable materials include various metals or alloys such as copper, silver, brass, and the like. Copper foil should be a better choice considering cost, processing, conductivity and ease of assembly. But not any technical limitations. The first planar coil 13, the second planar coil 14 and the joint 15 forming a single material can be fabricated by any metal working technique. Suitable techniques include known techniques of coating, low temperature deformation, high temperature deformation, cutting, stamping, etching, or the like.

The first planar coil 13, the second planar coil 14 and the connecting portion 15 may not Made of a continuous material. For example, the first planar coil 13 and the second planar coil 14 can be separately fabricated and then connected by the connecting portion. In such an example, the joint 15 can be a solder material or a viscous conductive material. When manufacturing in this manner, care must be taken to electrically connect the connecting portion 15 to the first planar coil 13 and the second planar coil 14.

FIG. 2 also shows that the first planar coil 13 and the second planar coil 14 are each packaged. An outer ring 131, 141 and an inner ring 132, 142, which are electrically connected in series, are kept at a distance from each other. Although the first planar coil 13 and the second planar coil 14 are each shown to include two windings, the present invention is not limited to the structure of two windings. More than two turns can also be applied to this creation. The number of turns depends on the required voltage conversion ratio, the width of the winding, the distance of each turn, and the diameter of the core 70. Therefore, there are no technical restrictions. In addition, the material width, thickness, and even shape of each winding may be determined as needed. Basically, the surface is formed into a flat winding, which is more material-saving and easy to process.

In the example of FIG. 2, the connecting portion 15 is electrically connected to the two planar coils 13, The inner circumferences 132, 142 of 14 and the windings of the two planar coils 13, 14 all extend in the same clock direction. Even if the first planar coil 13 and the second planar coil 14 are electrically connected in series, they are located in adjacent planes and maintain a distance.

The outer circumferences 131, 141 of the first planar coil 13 and the second planar coil 14 Up, away from one end of its inner rings 132, 142, the winding extends to form pads 11, 12. In the design of the present invention, the pads 11, 12 are respectively located at a first position P1 on the outer circumference of the imaginary geometry including the two-plane coil region, and a second position P2 from the first position. Specifically, the geometry may be a rectangle including the area where the planar coil component is located, for example, a rectangle formed by the upper and lower casings 71, 72 projected on the plane of the pads 11, 12, as shown in FIG. . At this time, the pads 11, 12 may be respectively located at the first position P1 and the second position P2 on one side or both sides of the rectangle (refer to FIG. 4), as shown in FIG. 4. In the surface bonding application, the first position P1 and the second position P2 may be where any two legs of the planar transformer are located. In other embodiments, the geometry may also be a polygon or circle containing the area in which the planar coil assembly is located. There is no limit to the shape, and it depends on the needs of the full-view application. The pads 11, 12 can be bent to form a suitable table Adhesively bonded pads. In addition, it can also extend laterally to form a large area of the pad to provide a function of fixing or dissipating heat. In the preferred embodiment of the present invention, the pads 11, 12 are positioned at different pin locations of the standard surface adhesive component.

The first planar coil 13 and the second planar coil 14 are both formed as shown in FIG. A scroll, that is, a slightly rounded outline. This design can provide better conversion efficiency. However, this creation is not limited to the winding of the scroll. For example, square, rectangular windings, and even other geometric windings commonly used in conventional techniques can be applied to the present creation. The figure shows that the inner circumference and the outer circumference of the first planar coil and the second planar coil are each formed substantially one week. This design ensures that the winding angle of the first planar coil 13 and the second planar coil 14 is maximized. But not any technical limitations. If the winding is not a spiral shape, the inner circumference and the outer circumference of the first planar coil and the second planar coil may each be formed substantially once. Thereby the winding angle is maximized.

In the example of FIG. 2, the planar coil module 10 further includes an insulating sheet 16, Between the first planar coil 13 and the second planar coil 14 to electrically isolate the two planar coils. The insulating sheet can use the same material, size, and thickness as the insulating sheets 73-79. The insulating sheet 16 forms a predetermined opening 17 for the connecting portion 15 to be inserted. The stable planar coil module 10 is thus formed. The depth of the slit 17 depends on the application, but preferably does not extend to the hole 18 in the center of the insulating sheet 16.

If necessary, an adhesive may be applied to the upper and lower sides of the insulating sheet 16 to improve The positioning effect of the first planar coil 13 and the second planar coil 14. Further, an insulating coating (not shown) may be applied to the winding surfaces of the first planar coil 13 and the second planar coil 14 to improve the insulating effect.

When assembled, the winding of the planar coil assembly 10 is preferably adjacent to the adjacent coil plate 30, 40 (Fig. 1) The windings overlap. However, it is also feasible to use the traversing method or the offset arrangement.

Figure 3 is a perspective view showing another embodiment of the modularized planar coil of the present invention. As shown, the modular planar coil of this embodiment also forms a planar coil assembly 20. The structure of the planar coil assembly 20 is the same as that of the planar coil assembly 10 of FIG. The biggest difference is that the outer rings 231, 241 are separated from one end of the inner rings 232, 242, and the windings also extend to form the pads 21, 22, but the pads 21, 22 are respectively located in the area including the two planar coils. The second position P2 on the outer circumference of the imaginary geometry and the third position P3 from the second position (see Fig. 4). Taking the example shown in Fig. 4 as an example, the geometric figure is a rectangle which is placed on a plane and coincides with the upper and lower casings 71, 72. At this time, the pads 21 and 22 are respectively located at the second position P2 and the third position P3 on one side or both sides of the rectangle. In other words, the second position P2 is the same as the geometrical pattern, and the position of the pad 12 extending from the outer circumference of the second coil in the embodiment of Fig. 2 is the same. In the surface bonding application, the second position P2 and the third position P3 may also be where any two legs of the planar transformer are located. Under this design, if two sets of planar coil assemblies have one of the pads in the same position as one of the other set of pads, the two pads can be overlapped to form an electrical connection, and two sets of planar coils can be achieved. The purpose of the serial connection of components.

Figure 4 is a diagram showing an example of the connection mode of the modularized planar coil of the present creation. intention. In the figures, the blocks surrounding the two planar coil assemblies represent the possible shapes of the planar transformer package containing the two planar coil assemblies. As shown in the figure, when the planar coil assemblies 10, 20 are connected in series, as long as the two sets of components are overlapped, the predetermined distance is maintained therebetween, and the two are overlapped with the pads at the same position with respect to the imaginary geometric figure, and fixed. , can form a series of coils. The two coil components can be fixed in any industrially used method, such as welding, adhesion, cold forging, welding, etc., as long as the two are electrically connected. In addition, the figure also shows the pads of the planar coil assembly 10. 11 and the pads 21, 22 of the planar coil assembly 20 are bent and extended to form a gasket to facilitate contact with the contacts on the circuit board. Since the planar coil assembly 10 is located far from the substrate, the pads 11, 12 extend in the height direction by the same length. The planar coil assembly 20 is located closer to the substrate, and its pads 21, 22 extend in the height direction by a shorter length than the pads 11, 12. In addition, the pads 12 of the planar coil assembly 10 provide only the function of overlapping the planar coil assembly 20, so that it is not necessary to bend to form a gasket shape.

In the specific example shown in Figure 4, the order of the concatenation method is: by bit The pad 11 of a position P1 enters the first group of planar coil assemblies 10, and is located in the outer layer 131 and the inner ring 132 of the first planar coil 13 of the second layer in the figure, and further to the first layer (upper layer) in the figure. The inner ring 142 and the outer ring 141 of the second planar coil 14 reach the pad 12 at the second position P2. The first planar coil 23 of the fourth layer (the lowest layer) in the figure is entered by the pad 21 via the pad 12 and the pad 21 of the same position at the second position P2. The outer ring 231 and the inner ring 232, and further to the inner ring 242 and the outer ring 241 of the second planar coil 24 located in the third layer in the figure, reach the pad 22 at the third position P3.

After the planar coil assembly 10 and the planar coil assembly 20 are connected in series, a four-layer layer is formed. The double-turn winding structure and three spacer pads are provided for assembly on the circuit board, for example, by surface adhesion. Of course, if three spacers are not required, the spacer of the pad 21 can be omitted. The pad 21 provides only the function of connecting to the pad 12. However, considering the stability of the overall planar coil assembly, it is preferable to provide a spacer regardless of whether the electrical or electronic connection function is provided. The purpose is to support the entire planar coil with the spacer.

Of course, the tandem method shown in the example of Figure 4 is only one possible Example. Since this creation provides a modular planar coil architecture, each set of planar coil assemblies has The coil body structure is basically the same, as long as the position and length of the pad, or even the extension of the gasket, can be changed according to the actual application requirements, and the coil structure with an unlimited number of turns and layers can be achieved. For example, the connection manner of the planar coils may be serially connected in the order of the first layer, the second layer, the third layer, and the fourth layer in the figure. Or concatenate in any order. In addition, as long as the lengths of the pads 11, 12 of the first set of planar coils 10 are extended, other planar coils of the same or different stages, or other electronic components, may be disposed between the two sets of planar coil assemblies. As noted above, this creation provides a modular planar coil architecture. The modular planar coil has multiple layers and multiple turns of winding. Sufficient to convert ratios that provide greater selectivity. The winding of the planar coil assembly can be formed into a single material that is easy to manufacture and assemble. The modular pad design provides the ability to easily connect most planar coil assemblies in series. It can be used to achieve the winding of the required number of layers and the number of turns according to the needs of the application. The planar coil module of the present invention does not need to be fabricated using a printed circuit board, and can greatly reduce the thickness of the planar transformer. And because a single component forms a multi-layer, multi-turn winding, the impedance can be reduced and the conversion efficiency can be improved.

10‧‧‧First planar coil assembly

11, 12‧‧‧ pads

13‧‧‧First plane coil

131, 141‧‧ ‧ outer ring

132, 142‧‧ inner circle

14‧‧‧Second plane coil

15‧‧‧Connecting Department

16‧‧‧Insulation sheet

17‧‧‧Incision

18‧‧‧ holes

Claims (24)

A planar coil assembly includes a first planar coil, a second planar coil, and a joint electrically connected in series with the first planar coil and the second planar coil; wherein the first planar coil and the second The planar coils each comprise an outer ring and an inner ring electrically connected in series, and the connecting portion is electrically connected to the inner ring of the two planar coil; the first planar coil and the second planar coil are located Adjacent to two planes, and maintaining a distance; the first planar coil and the outer ring of the second planar coil are extended from one end of the inner ring to form a pad; wherein the pad of the first planar coil is located a first position on the outer circumference of the imaginary geometry of the two planar coil regions, and the pads of the second planar coil are located on the outer circumference of the geometric pattern, away from the second position of the first position. The planar coil assembly of claim 1, wherein the two pads extend to the same height in a height direction. The planar coil assembly of claim 1, wherein the two pads extend to different heights in a height direction. The planar coil assembly of claim 1, wherein the geometric shape is a rectangle including the two planar coil regions. The planar coil assembly of claim 1, wherein the geometric shape is a polygon including the two planar coil regions. The planar coil assembly of claim 1, further comprising an insulating sheet interposed between the first planar coil and the second planar coil. The planar coil assembly of claim 6, wherein the insulating sheet forms a port for the connecting portion to be inserted. The planar coil assembly of claim 1, wherein the first planar coil, The second planar coil forms a continuous material with the joint. The planar coil assembly of claim 1, wherein the connecting portion is a solder material or a viscous conductive material. The planar coil assembly of claim 1, wherein the first planar coil and the second planar coil form a scroll shape, and the inner circumference and the outer circumference of the first planar coil and the second planar coil are respectively Formed substantially for one week. The planar coil assembly of claim 1, wherein the first planar coil and the second planar coil form a rectangular contour, and the inner circumference and the outer circumference of the first planar coil and the second planar coil are respectively Formed substantially for one week. A planar coil module includes at least a first planar coil assembly and a second planar coil assembly. The first and second planar coil assemblies each include: a first planar coil, a second planar coil, and a joint. Electrically connecting the first planar coil and the second planar coil in series; wherein the first planar coil and the second planar coil each comprise an outer ring and an inner ring electrically connected in series, maintaining a distance from each other, And the connecting portion is electrically connected to the inner ring of the two planar coil; the first planar coil and the second planar coil are located in two adjacent planes and maintain a distance; the first planar coil and the second planar coil are external Extending the end of the inner ring from the inner ring to form a pad; wherein the pad of the first planar coil is located at a first position on an outer circumference of the imaginary geometric figure including the two planar coil region, and the pad of the second planar coil is located a second position away from the first position on the outer circumference of the geometric pattern; a pad of the first planar coil of the second planar coil assembly is located at a second position on the outer circumference of the geometric figure, and a second plane thereof Ring pads positioned on an outer periphery of the geometry, leaving the first and third position of the second position; and The two sets of planar coil assemblies are electrically connected at the second position. The planar coil module of claim 12, wherein the four pads extend in the height direction to the same height. The planar coil module of claim 12, wherein the geometric figure is a rectangle including the planar coil region. The planar coil module of claim 12, further comprising two insulating sheets interposed between each of the first planar coils and the second planar coil. The planar coil module of claim 15, wherein the insulating sheet forms a port for the connecting portion to be inserted. The planar coil module of claim 12, wherein each of the first planar coil and the second planar coil and the connecting portion form a continuous material. The planar coil module of claim 12, wherein the connecting portion is a solder material or a viscous conductive material. The planar coil module of claim 12, wherein the first planar coil and the second planar coil of each planar coil assembly form a scroll shape, and the inner circumference of the first planar coil and the second planar coil Formed substantially one week with each other. A planar transformer includes a first planar coil assembly, a third planar coil assembly stacked with the first planar coil assembly, and a core; wherein the first planar coil assembly includes: a first planar coil, a second a planar coil and a connecting portion electrically connecting the first planar coil and the second planar coil; wherein the first planar coil and the second planar coil each comprise an outer ring and an inner electrically connected The loops are kept at a distance from each other, and the connecting portion is electrically connected to the inner ring of the two planar coils; the first planar coil and the second planar coil are located on two adjacent planes and maintained at a distance; Extending the first planar coil and the outer ring of the second planar coil from an end of the inner ring to form a pad; and the pad of the first planar coil is located on the outer circumference of the imaginary geometric figure including the two planar coil region a position, and a pad of the second planar coil is located on an outer circumference of the geometric pattern, away from the second position of the first position; the third planar coil assembly includes at least one planar coil; and the core is perpendicular to the two planar coil assembly The plane extends in the direction of the plane and passes through the central portion of the two-plane coil assembly. The planar transformer of claim 20, further comprising a metal casing covering the core and the coil portions of the two sets of planar coil assemblies. The planar transformer of claim 20, further comprising a second planar coil assembly, the second planar coil assembly comprising a first planar coil, a second planar coil, and a connecting portion electrically connected in series The first planar coil and the second planar coil; wherein the first planar coil and the second planar coil each comprise an outer ring and an inner ring electrically connected in series, each other maintaining a distance, and the connecting portion is electrically An inner ring of the two planar coils; the first planar coil and the second planar coil are located in two adjacent planes and maintained at a distance; the outer circumference of the first planar coil and the second planar coil are separated from the inner circumference thereof One end of the extension of the second planar coil assembly is located at a second position on the outer circumference of the geometric pattern, and the pad of the second planar coil is located on the outer circumference of the geometric pattern. Leaving a third position of the first and second positions; and the two sets of planar coil assemblies are electrically connected at the second position. The planar transformer of claim 22, wherein the third planar coil assembly is interposed between the first and second planar coil assemblies. The planar transformer of claim 22, further comprising a metal casing covering the core and the coil portions of the two sets of planar coil assemblies.