Planar high-power transformer

Abstract

The utility model provides a planar high-power transformer which comprises a magnetic core, a plurality of secondary copper sheets, a plurality of primary copper sheets, an upper insulating plate, a lower insulating plate, an insulating ring, a plurality of insulating sheets, a first copper column, a second copper column, a third copper column, a fourth copper column, a plurality of connecting copper columns and a fifth copper column. The upper insulating plate and the lower insulating plate sleeve the insulating ring, the first copper column, the second copper column, the third copper column, the fourth copper column, the fifth copper column and the plurality of connecting copper columns are connected between the upper insulating plate and the lower insulating plate, and the plurality of secondary copper sheets and the plurality of primary copper sheets sleeve the insulating ring and are located between the upper insulating plate and the lower insulating plate. The planar high-power transformer has the advantages of being small in size, tight in coupling, low in leakage inductance, high in performance precision, good in stability, compact in structure, high in strength, good in vibration resistance, capable of achieving whole-process automatic production, high in production efficiency and good in product consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic components, in particular to a planar high-power transformer. Background Art

[0002] As an electromagnetic component, the transformer is an important and indispensable electronic component in various electronic devices. It is widely used in power supply technology and power electronics technology. Its main functions include isolation and insulation, voltage conversion, current conversion, etc.

[0003] Compared with traditional transformers that use copper wires as winding coils, planar transformers have the advantages of high power density and small size because their winding coils are made of double-layer printed circuit boards or prefabricated flat copper plates, and the development of planar magnetic core technology. Using planar transformers to replace traditional skeleton transformers is the future development direction of transformers.

[0004] There is a protrusion on the edge of the PCB copper-clad plate of a planar transformer, and an electrical connection point in the form of a through hole is arranged in the protrusion, and the electrical connection points of adjacent PCB copper-clad plates are electrically connected by connecting columns. However, the protrusions of adjacent PCB copper-clad plates of the existing planar transformer are suspended from the overall frame of the transformer and electrically connected by connecting columns. During the production and transportation process, or even when the planar transformer is installed on the circuit board assembly process, the planar transformer is inevitably contacted and collided with other components. The protrusions of the PCB copper-clad plates suspended from the overall frame of the transformer are easily collided and bent, thereby affecting the working performance of the planar transformer.

[0005] In addition, the several layers of PCB copper clad boards of the existing planar transformer are fixed by the bottom magnetic core and the top magnetic core, and the several layers of PCB copper clad boards are bonded together by an insulating sheet. As the working time increases, the bonding force of the insulating sheet will fail, resulting in cracking and separation between the several layers of PCB copper clad boards. Considering the working vibration factors, the cracking and separation gaps between adjacent PCB copper clad boards will become larger and larger, affecting the close coupling between adjacent PCB copper clad boards, increasing the leakage magnetic phenomenon of the PCB copper clad boards, and affecting the working accuracy and stability of the planar transformer. Summary of the invention

[0006] In order to achieve the main purpose of the utility model, the utility model provides a planar high-power transformer with small volume, close coupling and low leakage inductance, high performance precision and good stability, compact structure, high strength and good vibration resistance, which can realize full-process automated production, high production efficiency and good product consistency.

[0007] In order to achieve the main purpose of the utility model, the utility model provides a planar high-power transformer, including a magnetic core, a plurality of secondary copper sheets, a plurality of primary copper sheets, an upper insulating plate, a lower insulating plate, an insulating ring, a plurality of insulating sheets, a first copper column, a second copper column, a third copper column, a fourth copper column, a plurality of connecting copper columns and a fifth copper column. The magnetic core includes an upper magnetic plate, a lower magnetic plate, two magnetic side plates and a magnetic column. The two magnetic side plates are connected between the upper magnetic plate and the lower magnetic plate to form a receiving cavity. The receiving cavity has a first opening and a second opening. The magnetic column is connected to the upper magnetic plate. and the lower magnetic plate and is located in the accommodating cavity, the insulating ring is sleeved on the magnetic column, the upper insulating plate is sleeved on the insulating ring adjacent to the upper magnetic plate, and the lower insulating plate is sleeved on the insulating ring adjacent to the lower magnetic plate; the first copper column, the second copper column and the third copper column are sequentially arranged side by side in the first opening and connected between the upper insulating plate and the lower insulating plate, the secondary pin ends of the first copper column, the second copper column and the third copper column protrude from the lower end surface of the lower insulating plate, the fourth copper column and the fifth copper column are located in the second opening and connected between the upper insulating plate and the lower insulating plate, the fourth copper column and the fifth copper column The primary pin end of the copper column protrudes from the lower end surface of the lower insulating plate, and a plurality of connecting copper columns are arranged side by side between the fourth copper column and the fifth copper column and connected between the upper insulating plate and the lower insulating plate; a plurality of secondary copper sheets and a plurality of primary copper sheets are sleeved on the insulating ring and located between the upper insulating plate and the lower insulating plate, and at least two secondary copper sheets are arranged between two adjacent primary copper sheets; two ends of one of the two adjacent secondary copper sheets are sleeved on the first copper column and the second copper column, and two ends of the other secondary copper sheet are sleeved on the second copper column and the third copper column The two ends of the primary copper sheet adjacent to the upper insulating plate are sleeved on the fourth copper column and the connecting copper column adjacent to the fourth copper column, the two ends of the primary copper sheet adjacent to the lower insulating plate are sleeved on the fifth copper column and the connecting copper column adjacent to the fifth copper column, and one end of two adjacent primary copper sheets is respectively sleeved on a connecting copper column; multiple insulating sheets are sleeved on the insulating ring, an insulating sheet is provided between the upper insulating plate and the primary copper sheet, an insulating sheet is provided between the lower insulating plate and the primary copper sheet, and an insulating sheet is provided between two adjacent copper sheets of multiple secondary copper sheets and multiple primary copper sheets.

[0008] It can be seen from the above scheme that the planar high-power transformer of the utility model does not need a skeleton, fully utilizes the space of the transformer, greatly reduces the volume and height of the transformer, and makes the transformer lighter. In addition, the upper insulating plate and the lower insulating plate of the planar high-power transformer of the utility model are firmly and rigidly connected by the first copper column, the second copper column, the third copper column, the fourth copper column, multiple connecting copper columns and the fifth copper column, so that multiple secondary copper sheets and multiple primary copper sheets are tightly clamped between the upper insulating plate and the lower insulating plate, so that the structure of the transformer is compact and has high strength, and the coupling degree of the multiple secondary copper sheets and the multiple primary copper sheets tightly overlap is increased, which can reduce leakage magnetic flux, and fully utilize the space, reduce parasitic parameters and the size can be controlled extremely accurately, so that the leakage inductance of the mass-produced transformer is stable and consistent, so that the performance accuracy of the transformer is high and the stability is good, and the mounting area of ​​the planar high-power transformer of the utility model is large, the height is low, and the anti-vibration performance is strong after installation. At the same time, the secondary copper sheet and the primary copper sheet of the planar high-power transformer of the utility model are flat copper sheets, which have the characteristics of large unit current density. Under the same cross-sectional area as the round copper wire, they can achieve the current value that the round copper wire cannot reach. In addition, at least two secondary copper sheets are stacked between two adjacent primary copper sheets in this embodiment, which can meet the high current and high power requirements of the product. In addition, the insulating ring of the planar high-power transformer of the utility model is sleeved on the magnetic column, the upper insulating plate is sleeved on the insulating ring adjacent to the upper magnetic plate, and multiple insulating sheets are respectively sleeved on the insulating ring, an insulating sheet is arranged between the upper insulating plate and the primary copper sheet, an insulating sheet is arranged between the lower insulating plate and the primary copper sheet, and an insulating sheet is arranged between two adjacent copper sheets of multiple secondary copper sheets and multiple primary copper sheets, so that the insulation effect of the transformer is better and the anti-interference performance is better. In addition, the secondary copper sheet and the primary copper sheet of the planar high-power transformer of the utility model are both produced by machine automation, which can achieve extremely high consistency in appearance and size. When producing the transformer, relevant automation equipment can be used to achieve full-process automated production, with high production efficiency, good product consistency, stable performance, and saving of material and labor costs.

[0009] Therefore, the planar high-power transformer of the utility model has the characteristics of small size, close coupling and low leakage inductance, high performance accuracy and good stability, compact structure, high strength and good vibration resistance, and can realize full-process automated production, high production efficiency and good product consistency.

[0010] A further solution is that multiple secondary copper sheets are respectively sleeved on the connection positions of the first copper column, the second copper column and the third copper column with solder; and / or, multiple primary copper sheets are respectively sleeved on the connection positions of the fourth copper column, the connecting copper column and the fifth copper column with solder.

[0011] A further solution is that the secondary pin ends of the first copper pillar, the second copper pillar and the third copper pillar are flush with the lower end surface of the lower magnetic plate away from the upper magnetic plate; and / or the primary pin ends of the fourth copper pillar and the fifth copper pillar are flush with the lower end surface of the lower magnetic plate away from the upper magnetic plate.

[0012] A further solution is that the number of the plurality of secondary copper sheets is greater than the number of the plurality of primary copper sheets, and the thickness of the secondary copper sheets is greater than the thickness of the primary copper sheets.

[0013] A further solution is that the diameters of the first copper pillar, the second copper pillar and the third copper pillar are the same, the diameters of the fourth copper pillar, the connecting copper pillar and the fifth copper pillar are the same, and the diameter of the third copper pillar is greater than the diameter of the fourth copper pillar.

[0014] A further solution is that the top ends of the first copper pillar, the second copper pillar and the third copper pillar are radially protruding with a first shoulder, and the first shoulder is located on the upper end surface of the upper insulating plate away from the lower insulating plate; and / or the secondary pin ends of the first copper pillar, the second copper pillar and the third copper pillar are radially protruding with a second shoulder.

[0015] A further solution is that the top ends of the fourth copper pillar and the fifth copper pillar are radially protruding with a third shoulder, and the third shoulder is located on the upper end surface of the upper insulating plate away from the lower insulating plate; and / or, the primary pin ends of the fourth copper pillar and the fifth copper pillar are radially protruding with a fourth shoulder; and / or, the two ends of the connecting copper pillars are respectively radially protruding with a fifth shoulder and a sixth shoulder, the fifth shoulder is located on the upper end surface of the upper insulating plate away from the lower insulating plate, and the sixth shoulder is located on the lower end surface of the lower insulating plate away from the upper insulating plate.

[0016] A further solution is that both the upper insulating plate and the lower insulating plate are insulating fiberboards; and / or, both end surfaces of the insulating sheet are provided with adhesive layers, an insulating sheet is bonded between the upper insulating plate and the primary copper sheet, an insulating sheet is bonded between the lower insulating plate and the primary copper sheet, and an insulating sheet is bonded between two adjacent copper sheets of multiple secondary copper sheets and multiple primary copper sheets.

[0017] A further solution is that the magnetic core includes a first magnet and a second magnet, the first magnet includes an upper magnetic plate, two first side plates and a first column, the second magnet includes a lower magnetic plate, two second side plates and a second column, a first side plate and a second side plate are connected by epoxy resin glue to form a magnetic side plate, and the first column and the second column are connected by epoxy resin glue to form a magnetic column.

[0018] A further solution is that the magnetic core includes a first magnet and a second magnet, the first magnet includes an upper magnetic plate, two magnetic side plates and a magnetic column, the second magnet is a lower magnetic plate, the magnetic side plates are connected to the second magnet by epoxy resin glue, and the magnetic column is connected to the second magnet by epoxy resin glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a structural diagram from the first perspective of an embodiment of the planar high-power transformer of the utility model.

[0020] Figure 2 It is a structural diagram from a second viewing angle of an embodiment of the planar high-power transformer of the utility model.

[0021] Figure 3 It is a cross-sectional view from a first viewing angle of an embodiment of the planar high-power transformer of the utility model.

[0022] Figure 4 It is a cross-sectional view from a second viewing angle of an embodiment of the planar high-power transformer of the utility model.

[0023] Figure 5 It is a structural exploded view of an embodiment of a planar high-power transformer of the utility model.

[0024] Figure 6 It is a partial structural diagram of a planar high-power transformer embodiment of the utility model from a first viewing angle.

[0025] Figure 7 It is a partial structural diagram of the second viewing angle of an embodiment of the planar high-power transformer of the utility model.

[0026] Figure 8 It is an exploded view of the first implementation mode of the magnetic core in the embodiment of the planar high-power transformer of the utility model.

[0027] Fig. 9 It is an exploded view of a second implementation mode of the magnetic core in the planar high-power transformer embodiment of the utility model.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0029] See also Figures 1 to 9The present embodiment discloses a planar high-power transformer 10, including a magnetic core 11, a plurality of secondary copper sheets 20 and a plurality of primary copper sheets 21. The magnetic core 11 includes an upper magnetic plate 111, a lower magnetic plate 112, two magnetic side plates 113 and a magnetic column 114. The two magnetic side plates 113 are arranged opposite to each other and are respectively connected between the upper magnetic plate 111 and the lower magnetic plate 112 to form a receiving cavity (not marked). The receiving cavity has a first opening (not marked) and a second opening (not marked) arranged opposite to each other. The magnetic column 114 is connected between the upper magnetic plate 111 and the lower magnetic plate 112 and is located in the receiving cavity. Among them, the planar high-power transformer 10 of this embodiment also includes an upper insulating plate 12, a lower insulating plate 13, an insulating ring 23, a plurality of insulating sheets 22, a first copper column 17, a second copper column 18, a third copper column 19, a fourth copper column 14, a plurality of connecting copper columns 16 and a fifth copper column 15. The insulating ring 23 is sleeved on the magnetic column 114, the upper insulating plate 12 is sleeved on the insulating ring 23 adjacent to the upper magnetic plate 111, and the lower insulating plate 13 is sleeved on the insulating ring 23 adjacent to the lower magnetic plate 112. Furthermore, in this embodiment, the first copper pillar 17, the second copper pillar 18 and the third copper pillar 19 are sequentially arranged side by side in the first opening and are respectively connected between the upper insulating plate 12 and the lower insulating plate 13, and the secondary pin ends of the first copper pillar 17, the second copper pillar 18 and the third copper pillar 19 protrude from the lower insulating plate 13 and are arranged away from the lower end surface of the upper insulating plate 12, the fourth copper pillar 14 and the fifth copper pillar 15 are located in the second opening and are respectively connected between the upper insulating plate 12 and the lower insulating plate 13, and the primary pin ends of the fourth copper pillar 14 and the fifth copper pillar 15 protrude from the lower end surface of the lower insulating plate 13, the fourth copper pillar 14 and the fifth copper pillar 15 are respectively arranged close to the two magnetic side plates 113, and a plurality of connecting copper pillars 16 are arranged side by side between the fourth copper pillar 14 and the fifth copper pillar 15 and are connected between the upper insulating plate 12 and the lower insulating plate 13. In addition, in this embodiment, multiple secondary copper sheets 20 and multiple primary copper sheets 21 are respectively sleeved on the insulating ring 23 and located between the upper insulating plate 12 and the lower insulating plate 13, and at least two secondary copper sheets 20 are arranged between two adjacent primary copper sheets 21; the two ends of one of the two adjacent secondary copper sheets 20 are respectively sleeved on the first copper column 17 and the second copper column 18, and the two ends of the other secondary copper sheet 20 are respectively sleeved on the second copper column 18 and the third copper column 19; the two ends of the primary copper sheet 21 adjacent to the upper insulating plate 12 are respectively sleeved on the fourth copper column 14 and the connecting copper column 16 adjacent to the fourth copper column 14, and the two ends of the primary copper sheet 21 adjacent to the lower insulating plate 13 are respectively sleeved on the fifth copper column 15 and the connecting copper column 16 adjacent to the fifth copper column 15, and one end of two adjacent primary copper sheets 21 is respectively sleeved on one connecting copper column 16. In addition, in this embodiment, multiple insulating sheets 22 are respectively sleeved on the insulating rings 23, an insulating sheet 22 is arranged between the upper insulating plate 12 and the primary copper sheet 21, an insulating sheet 22 is arranged between the lower insulating plate 13 and the primary copper sheet 21, and an insulating sheet 22 is arranged between two adjacent copper sheets of the multiple secondary copper sheets 20 and the multiple primary copper sheets 21.

[0030] The planar high-power transformer 10 of this embodiment does not need a skeleton, fully utilizes the space of the transformer 10, greatly reduces the volume and height of the transformer 10, and makes the weight of the transformer 10 lighter. In addition, the upper insulating plate 12 and the lower insulating plate 13 of the planar high-power transformer 10 of this embodiment are firmly and rigidly connected by the first copper pillar 17, the second copper pillar 18, the third copper pillar 19, the fourth copper pillar 14, the plurality of connecting copper pillars 16 and the fifth copper pillar 15, so that the plurality of secondary copper sheets 20 and the plurality of primary copper sheets 21 are tightly clamped between the upper insulating plate 12 and the lower insulating plate 13, so that the structure of the transformer 10 is compact and has high strength, and the coupling degree of the plurality of secondary copper sheets 20 and the plurality of primary copper sheets 21 tightly overlapped is increased, which can reduce leakage magnetic flux, and fully utilize the space, reduce parasitic parameters, and the size can be controlled extremely accurately, so that the leakage inductance of the mass-produced transformer 10 is stable and consistent, so that the performance accuracy of the transformer 10 is high and the stability is good, and the planar high-power transformer 10 of this embodiment has a large mounting area, a low height, and strong anti-vibration performance after installation. At the same time, the secondary copper sheet 20 and the primary copper sheet 21 of the planar high-power transformer 10 of the present embodiment are flat copper sheets, which have the characteristics of large unit current density. Under the same cross-sectional area as the round copper wire, the current value that the round copper wire cannot reach can be achieved. In addition, at least two secondary copper sheets 20 are stacked between two adjacent primary copper sheets 21 of the present embodiment, which can meet the high current and high power requirements of the product. In addition, the insulating ring 23 of the planar high-power transformer 10 of the present embodiment is sleeved on the magnetic column 114, the upper insulating plate 12 is sleeved on the insulating ring 23 adjacent to the upper magnetic plate 111, and multiple insulating sheets 22 are respectively sleeved on the insulating ring 23, an insulating sheet 22 is arranged between the upper insulating plate 12 and the primary copper sheet 21, an insulating sheet 22 is arranged between the lower insulating plate 13 and the primary copper sheet 21, and an insulating sheet 22 is arranged between two adjacent copper sheets of multiple secondary copper sheets 20 and multiple primary copper sheets 21, so that the insulation effect of the transformer 10 is better and the anti-interference performance is better. In addition, the secondary copper sheet 20 and the primary copper sheet 21 of the planar high-power transformer 10 of this embodiment are both produced by machine automation, which can achieve extremely high consistency in appearance and size. When producing the transformer 10, relevant automation equipment can be used to achieve full-process automated production, with high production efficiency, good product consistency, stable performance, and saving of material and labor costs.

[0031] Therefore, the planar high-power transformer 10 of this embodiment has the characteristics of small size, tight coupling and low leakage inductance, high performance accuracy and good stability, compact structure, high strength and good vibration resistance, and can achieve full-process automated production, high production efficiency and good product consistency.

[0032] In order to improve the stability of the structural connection and the reliability of the electrical connection, in this embodiment, multiple secondary copper sheets 20 are respectively sleeved on the connection positions of the first copper column 17, the second copper column 18 and the third copper column 19 by soldering, and multiple primary copper sheets 21 are respectively sleeved on the connection positions of the fourth copper column 14, the connection copper column 16 and the fifth copper column 15 by soldering, so that the connection ends of the secondary copper sheets 20 and the primary copper sheets 21 are firmly electrically connected to the copper columns by soldering. Specifically, in this embodiment, the secondary pin ends of the first copper column 17, the second copper column 18 and the third copper column 19 are flush with the lower end surface of the lower magnetic plate 112 away from the upper magnetic plate 111, and the primary pin ends of the fourth copper column 14 and the fifth copper column 15 are flush with the lower end surface of the lower magnetic plate 112 away from the upper magnetic plate 111.

[0033] In order to further improve the stability of the structural connection and the reliability of the electrical connection, the top ends of the first copper pillar 17, the second copper pillar 18 and the third copper pillar 19 of this embodiment are radially protruded with first shoulders 171, 181, 191, and the first shoulders 171, 181, 191 are located on the upper end surface of the upper insulating plate 12 away from the lower insulating plate 13. The secondary pin ends of the first copper pillar 17, the second copper pillar 18 and the third copper pillar 19 of this embodiment are radially protruded with second shoulders 172, 182, 192. The top ends of the fourth copper pillar 14 and the fifth copper pillar 15 of this embodiment are radially protruded with second shoulders 172, 182, 192. The third shoulders 141 and 151 are protrudingly provided, and the third shoulders 141 and 151 are located on the upper end surface of the upper insulating plate 12 away from the lower insulating plate 13. The primary pin ends of the fourth copper pillar 14 and the fifth copper pillar 15 of this embodiment are radially protrudingly provided with fourth shoulders 142 and 152. The two ends of the connecting copper pillar 16 of this embodiment are radially protrudingly provided with fifth shoulders 161 and sixth shoulders 162, respectively. The fifth shoulder 161 is located on the upper end surface of the upper insulating plate 12 away from the lower insulating plate 13, and the sixth shoulder 162 is located on the lower end surface of the lower insulating plate 13 away from the upper insulating plate 12. Among them, one end of the copper pillar itself has a shoulder, and during the manufacturing process, the other end of the copper pillar can be deformed to form another shoulder by riveting it.

[0034] In order to meet the high current and high power requirements of the product, the number of multiple secondary copper sheets 20 in this embodiment is greater than the number of multiple primary copper sheets 21, and the thickness of the secondary copper sheet 20 is greater than the thickness of the primary copper sheet 21. In addition, the diameters of the first copper column 17, the second copper column 18 and the third copper column 19 in this embodiment are the same, the diameters of the fourth copper column 14, the connecting copper column 16 and the fifth copper column 15 are the same, and the diameter of the third copper column 19 is greater than the diameter of the fourth copper column 14, thereby realizing the characteristics of large overcurrent and large output power of the transformer 10.

[0035] Specifically, the upper insulating plate 12 and the lower insulating plate 13 of the present embodiment are both insulating fiberboards, and adhesive layers (not marked) are provided on both end surfaces of the insulating sheet 22 of the present embodiment, the insulating sheet 22 is bonded between the upper insulating plate 12 and the primary copper sheet 21, the insulating sheet 22 is bonded between the lower insulating plate 13 and the primary copper sheet 21, and the insulating sheet 22 is bonded between two adjacent copper sheets of the multiple secondary copper sheets 20 and the multiple primary copper sheets 21, so that the upper insulating plate 12, the lower insulating plate 13, the multiple secondary copper sheets 20 and the multiple primary copper sheets 21, the multiple insulating sheets 22, the first copper column 17, the second copper column 18, the third copper column 19, the fourth copper column 14, the multiple connecting copper columns 16 and the fifth copper column 15 are tightly combined into a whole, with a compact structure, high strength, tight coupling and low leakage inductance, which greatly improves the performance accuracy and stability.

[0036] Combination Figure 8 , is a first embodiment of the magnetic core 11, in which the magnetic core 11 includes a first magnet 110 and a second magnet 120, the first magnet 110 includes an upper magnetic plate 111, two first side plates 1102 and a first column 1103, the second magnet 120 includes a lower magnetic plate 112, two second side plates 1202 and a second column 1203, a first side plate 1102 and a second side plate 1202 are connected by epoxy resin glue to form a magnetic side plate 113, and the first column 1103 and the second column 1203 are connected by epoxy resin glue to form a magnetic column 114.

[0037] Combination Fig. 9 , is a second embodiment of the magnetic core 11', in which the magnetic core 11' includes a first magnet 110' and a second magnet 120', the first magnet 110' includes an upper magnetic plate 111, two magnetic side plates 113 and a magnetic column 114, the second magnet 120' is a lower magnetic plate 112, the magnetic side plates 113 and the second magnet 120' are connected by epoxy resin glue, and the magnetic column 114 and the second magnet 120' are connected by epoxy resin glue.

[0038] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the present invention should be included in the scope of the present invention patent application.

Claims

1. A planar high-power transformer, comprising a magnetic core, a plurality of secondary copper sheets and a plurality of primary copper sheets, wherein the magnetic core comprises an upper magnetic plate, a lower magnetic plate, two magnetic side plates and a magnetic column, wherein the two magnetic side plates are connected between the upper magnetic plate and the lower magnetic plate to form a receiving cavity, wherein the receiving cavity has a first opening and a second opening, and the magnetic column is connected between the upper magnetic plate and the lower magnetic plate and is located in the receiving cavity, wherein: The planar high-power transformer also includes an upper insulating plate, a lower insulating plate, an insulating ring, a plurality of insulating sheets, a first copper pillar, a second copper pillar, a third copper pillar, a fourth copper pillar, a plurality of connecting copper pillars and a fifth copper pillar, wherein the insulating ring is sleeved on the magnetic pillar, the upper insulating plate is sleeved on the insulating ring adjacent to the upper magnetic plate, and the lower insulating plate is sleeved on the insulating ring adjacent to the lower magnetic plate; the first copper pillar, the second copper pillar and the third copper pillar are sequentially arranged side by side in the first opening and connected between the upper insulating plate and the lower insulating plate, the secondary pin ends of the first copper pillar, the second copper pillar and the third copper pillar protrude from the lower end surface of the lower insulating plate, the fourth copper pillar and the fifth copper pillar are located in the second opening and connected between the upper insulating plate and the lower insulating plate, the primary pin ends of the fourth copper pillar and the fifth copper pillar protrude from the lower end surface of the lower insulating plate, and a plurality of connecting copper pillars are arranged side by side between the fourth copper pillar and the fifth copper pillar and connected between the upper insulating plate and the lower insulating plate; A plurality of the secondary copper sheets and the primary copper sheets are sleeved on the insulating ring and located between the upper insulating plate and the lower insulating plate, and at least two of the secondary copper sheets are arranged between two adjacent primary copper sheets; two ends of one of the two adjacent secondary copper sheets are sleeved on the first copper column and the second copper column, and two ends of the other secondary copper sheet are sleeved on the second copper column and the third copper column; two ends of the primary copper sheet adjacent to the upper insulating plate are sleeved on the fourth copper column and the connecting copper column adjacent to the fourth copper column, two ends of the primary copper sheet adjacent to the lower insulating plate are sleeved on the fifth copper column and the connecting copper column adjacent to the fifth copper column, and one end of two adjacent primary copper sheets is sleeved on one of the connecting copper columns respectively; a plurality of the insulating sheets are sleeved on the insulating ring, the insulating sheet is arranged between the upper insulating plate and the primary copper sheet, the insulating sheet is arranged between the lower insulating plate and the primary copper sheet, and the insulating sheet is arranged between two adjacent copper sheets of the plurality of the secondary copper sheets and the plurality of the primary copper sheets.

2. The planar high-power transformer according to claim 1, characterized in that: A plurality of the secondary copper sheets are respectively sleeved on the connection positions of the first copper column, the second copper column and the third copper column with solder; And / or, the plurality of primary copper sheets are respectively sleeved and soldered at connection positions on the fourth copper column, the connecting copper column and the fifth copper column.

3. The planar high-power transformer according to claim 1, characterized in that: The secondary pin ends of the first copper pillar, the second copper pillar and the third copper pillar are flush with the lower end surface of the lower magnetic plate away from the upper magnetic plate; And / or, the primary pin ends of the fourth copper column and the fifth copper column are flush with the lower end surface of the lower magnetic plate away from the upper magnetic plate.

4. The planar high-power transformer according to claim 1, characterized in that: The number of the secondary copper sheets is greater than the number of the primary copper sheets, and the thickness of the secondary copper sheets is greater than the thickness of the primary copper sheets.

5. The planar high-power transformer according to claim 4, characterized in that: The first copper pillar, the second copper pillar and the third copper pillar have the same diameter, the fourth copper pillar, the connecting copper pillar and the fifth copper pillar have the same diameter, and the diameter of the third copper pillar is greater than the diameter of the fourth copper pillar.

6. The planar high-power transformer according to claim 1, characterized in that: The top ends of the first copper column, the second copper column and the third copper column are radially protruded to form a first shoulder, and the first shoulder is located on the upper end surface of the upper insulating plate away from the lower insulating plate; And / or, the secondary pin ends of the first copper pillar, the second copper pillar and the third copper pillar are radially protruding and provided with a second shoulder.

7. The planar high-power transformer according to claim 1, characterized in that: The top ends of the fourth copper column and the fifth copper column are radially protruded to form a third shoulder, and the third shoulder is located on the upper end surface of the upper insulating plate away from the lower insulating plate; And / or, the primary pin ends of the fourth copper pillar and the fifth copper pillar are radially protruding and provided with a fourth shoulder; And / or, the two ends of the connecting copper column are radially protruding with a fifth shoulder and a sixth shoulder, the fifth shoulder is located on the upper end surface of the upper insulating plate away from the lower insulating plate, and the sixth shoulder is located on the lower end surface of the lower insulating plate away from the upper insulating plate.

8. The planar high-power transformer according to claim 1, characterized in that: The upper insulating plate and the lower insulating plate are both insulating fiberboards; And / or, both end surfaces of the insulating sheet are provided with an adhesive layer, the insulating sheet is bonded between the upper insulating plate and the primary copper sheet, the insulating sheet is bonded between the lower insulating plate and the primary copper sheet, and the insulating sheet is bonded between two adjacent copper sheets of the multiple secondary copper sheets and the multiple primary copper sheets.

9. The planar high-power transformer according to any one of claims 1 to 8, characterized in that: The magnetic core includes a first magnet and a second magnet, the first magnet includes the upper magnetic plate, two first side plates and a first column, the second magnet includes the lower magnetic plate, two second side plates and a second column, one first side plate and one second side plate are connected by epoxy resin glue to form a magnetic side plate, and the first column and the second column are connected by epoxy resin glue to form the magnetic column.

10. The planar high-power transformer according to any one of claims 1 to 8, characterized in that: The magnetic core includes a first magnet and a second magnet, the first magnet includes the upper magnetic plate, the two magnetic side plates and the magnetic column, the second magnet is the lower magnetic plate, the magnetic side plates are connected to the second magnet by epoxy resin glue, and the magnetic column is connected to the second magnet by epoxy resin glue.

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