Transformer

Abstract

The invention discloses a transformer, and relates to the technical field of transformers, and the transformer comprises an iron core, a primary winding and a secondary winding. Wherein the primary winding is wound on the iron core, the primary winding is used for being electrically connected with a board card, the secondary winding comprises a conductive shell and a conductive inner core arranged in the conductive shell, the conductive shell is provided with a containing cavity for containing the iron core, the conductive inner core penetrates through a closed magnetic circuit formed in the iron core, and the conductive shell and the conductive inner core are used for being electrically connected with the board card. According to the transformer with the design, on the basis that basic electrical performance is guaranteed, the transformer is compact in structure, small in size and low in cost and has good heat conduction, heat dissipation and shielding performance.

Description

Technical Field

[0001] This application relates to the technical field of transformers, and particularly to a transformer. Background Art

[0002] Currently, after simplification, a transformer component usually consists of a primary winding, a secondary winding, and an iron core. When an alternating current passes through the primary winding, an alternating magnetic flux is generated in the iron core, inducing a voltage (or current) in the secondary winding. Based on the above working principle, when designing a transformer, there are design difficulties such as a large amount of heat generation, poor thermal conductivity, and poor shielding performance. In order to control heat generation, promote heat dissipation, and maintain a clean electromagnetic environment, current transformers often need to be provided with a heat conduction structure and a shielding structure, which will result in a complex transformer structure, a large volume, and a high production cost.

[0003] Therefore, how to balance a small volume, low cost, and good thermal conductivity, electromagnetic shielding performance, etc. in the design of a transformer is a technical problem that those skilled in the art need to solve currently. Summary of the Invention

[0004] The purpose of this application is to provide a transformer, which solves the problem that the traditional transformer design cannot balance a small volume, low cost, and good thermal conductivity and electromagnetic shielding performance.

[0005] To achieve the above purpose, this application provides a transformer, including:

[0006] An iron core;

[0007] A primary winding wound around the outside of the iron core for electrical connection with a board;

[0008] A secondary winding, including a conductive outer shell and a conductive inner core disposed inside the conductive outer shell. The conductive outer shell has a receiving cavity for accommodating the iron core. The conductive inner core passes through the closed magnetic circuit formed in the iron core. The conductive outer shell and the conductive inner core are used for electrical connection with a board.

[0009] In some embodiments, the conductive outer shell includes an annular surrounding plate and a sealing plate disposed at an opening on one side of the annular surrounding plate. The sealing plate and the annular surrounding plate form the receiving cavity, and the iron core is inserted into the receiving cavity from the opening on the other side of the annular surrounding plate.

[0010] In some embodiments, the secondary winding is a structure formed by punching, cutting, and bending a metal plate.

[0011] In some embodiments, the sealing plate includes two first sealing plate bodies and a second sealing plate body disposed between the two first sealing plate bodies. The conductive inner core includes two conductive core plates. The two conductive core plates are integrally disposed on the two first sealing plate bodies respectively. The second sealing plate body and the two first sealing plate bodies are folded and joined to form the sealing plate, and the two conductive core plates overlap to form the conductive inner core.

[0012] In some embodiments, a bending portion is provided at one end of the second sealing plate body close to the conductive inner core, and a clamping groove is provided in the bending portion. After the two conductive core plates overlap, they are clamped in the clamping groove.

[0013] In some embodiments, the annular enclosing plate is a closed rectangular enclosing plate formed by integral folding, and the closed rectangular enclosing plate includes:

[0014] Two first enclosing plate bodies, respectively arranged on both sides of the conductive inner core along the first direction;

[0015] A second enclosing plate body, arranged on one side of the conductive inner core along the second direction perpendicular to the first direction;

[0016] Two third enclosing plate bodies, arranged on the other side of the conductive inner core along the second direction, and the two third enclosing plate bodies are integrally arranged on the two first enclosing plate bodies respectively.

[0017] In some embodiments, first pin portions are provided on the first enclosing plate body, the second enclosing plate body and the third enclosing plate body, and a second pin portion is provided on the conductive inner core. Both the first pin portion and the second pin portion are used for connecting with the board.

[0018] In some embodiments, the transformer further includes a bottom partition plate, which covers the surface of the primary winding close to the second pin portion. The bottom partition plate is provided with a fixing hole for fixing the wire end of the primary winding and an avoidance groove for avoiding the second pin portion.

[0019] In some embodiments, the transformer further includes two bobbin skeletons. The primary winding is wound around the two bobbin skeletons, and the iron core is embedded in the two bobbin skeletons to fix the primary winding and the iron core and separate the primary winding and the iron core.

[0020] In some embodiments, the iron core includes two yokes and two spaced iron core columns. The two yokes are respectively arranged at both ends of the two iron core columns;

[0021] The bobbin skeleton includes a skeleton body and extension bodies arranged at both ends of the skeleton body. The skeleton body is provided with an annular groove for accommodating the winding of the primary winding and a jack for inserting the iron core column. The annular groove is provided with a hollow hole, and the extension bodies on the same side of the two skeleton bodies form a accommodating space for accommodating the yoke.

[0022] Compared with the above background art, the transformer provided by the embodiment of the present application includes an iron core, a primary winding, and a secondary winding. Among them, the primary winding is wound around the iron core, and the primary winding is used for electrical connection with the board. The secondary winding includes a conductive outer shell and a conductive inner core disposed inside the conductive outer shell. The conductive outer shell has a receiving cavity for receiving the iron core. The conductive inner core passes through the closed magnetic circuit formed in the iron core. The conductive outer shell and the conductive inner core are used for electrical connection with the board. Compared with the traditional secondary winding, the transformer provided by the embodiment of the present application designs the secondary winding as a housing structure with a receiving cavity. The beneficial effects of the transformer configured in this way mainly include:

[0023] First, the secondary winding is electrically connected to the board through the conductive inner core and the conductive outer shell, and the primary winding is electrically connected to the board. At the same time, the iron core is located in the receiving cavity. When an alternating current passes through the primary winding, an alternating magnetic flux is generated in the iron core, inducing a voltage in the secondary winding formed by the conductive inner core and the conductive outer shell. In this way, the transformer completes the transmission of electrical energy and the transfer of signals through the connection with the board, thereby converting the input voltage into the output voltage required by the circuit to meet the different voltage requirements of different circuit modules;

[0024] Second, the conductive inner core passes through the closed magnetic circuit formed in the iron core, which helps to concentrate the magnetic flux, reduce the magnetic flux leakage, and enable more magnetic flux to pass through the iron core to close, thereby improving the energy transmission efficiency of the transformer and reducing the energy loss. At the same time, the special structural design of the conductive inner core and the conductive outer shell can also optimize the magnetic field distribution inside the transformer, making the magnetic field more uniform and stable, which helps to improve the performance and reliability of the transformer;

[0025] Third, on the basis of playing the basic electrical performance, due to the special structure of the secondary winding formed by the conductive inner core and the conductive outer shell. Specifically, the main part of the secondary winding is disposed outside the iron core and the primary winding. Since the secondary winding will generate heat when participating in the circuit, placing the main part of the secondary winding on the outermost side can increase the heat dissipation area and facilitate heat dissipation, making the transformer have good heat conduction and heat dissipation performance;

[0026] Fourth, since the iron core and the primary winding wound around the iron core are integrally received in the receiving cavity, that is, the conductive outer shell of the secondary winding integrally wraps the iron core and the primary winding from the outside. Therefore, this design not only has good shielding performance, enabling the transformer to have good anti-interference and anti-magnetic and electrical leakage capabilities, but also can play a role in protecting the internal components;

[0027] Fifthly, the overall structure of the transformer designed as above is compact, reducing the volume and being more conducive to the electrical connection with the board. The conductive outer shell of the secondary winding serves as both a wire and a protective housing, achieving multiple functions with one component. In addition, as a container, when the product applying this design needs to be potted and encapsulated, the conductive outer shell can directly serve as the encapsulation container without the need for additional molds and auxiliary materials, thus reducing the production cost to a certain extent.

[0028] In summary, the transformer designed as above not only ensures the basic electrical performance but also takes into account the compact structure, small volume, low cost, and good thermal conductivity, heat dissipation, and shielding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0030] Figure 1 Schematic diagram of the overall structure of the transformer in the embodiment of the present application;

[0031] Figure 2 For Figure 1 exploded view of the transformer shown;

[0032] Figure 3 For Figure 2 assembly schematic diagram of the iron core, primary winding, secondary winding, and bobbin skeleton in ;

[0033] Figure 4 For Figure 2 schematic diagram of the structure of the secondary winding in ;

[0034] Figure 5 For Figure 4 forming schematic diagram of the secondary winding shown;

[0035] Figure 6 For Figure 2 assembly schematic diagram of the iron core, primary winding, and bobbin skeleton in ;

[0036] Figure 7 For Figure 6 assembly schematic diagram of the primary winding and bobbin skeleton in ;

[0037] Figure 8 For Figure 7 schematic diagram of the structure of the bobbin skeleton in ;

[0038] Figure 9 For Figure 7Schematic diagram of part of the iron core structure.

[0039] Among them:

[0040] 10 - Iron core, 11 - Yoke, 12 - Core column;

[0041] 20 - Primary winding, 21 - Wire end;

[0042] 30 - Secondary winding, 31 - Conductive housing, 311 - Ring-shaped enclosing plate, 3111 - First enclosing plate body, 3112 - Second enclosing plate body, 3113 - Third enclosing plate body, 312 - Sealing plate, 3121 - First sealing plate body, 3122 - Second sealing plate body, 3123 - Bending part, 3124 - Card slot, 313 - First pin part, 32 - Conductive inner core, 321 - Conductive core plate, 322 - Second pin part, 33 - Accommodating cavity;

[0043] 40 - Bottom partition board, 41 - Fixing hole, 42 - Avoidance groove;

[0044] 50 - Bobbin skeleton, 51 - Skeleton body, 511 - Ring-shaped groove, 512 - Jack, 513 - Hollow hole, 52 - Extension body, 521 - Accommodating space. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0046] In order to enable those skilled in the art of this technology to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0047] Please refer to Figure 1 、 Figure 2 and Figure 3 , the transformer provided by the embodiment of the present application includes an iron core 10, a primary winding 20 and a secondary winding 30. Among them, the primary winding 20 is wound around the outside of the iron core 10, and the primary winding 20 is used for electrical connection with the board. The secondary winding 30 includes a conductive housing 31 and a conductive inner core 32 arranged inside the conductive housing 31. The conductive housing 31 has an accommodating cavity 33 for accommodating the iron core 10. The conductive inner core 32 passes through the closed magnetic circuit formed in the iron core 10. The conductive housing 31 and the conductive inner core 32 are used for electrical connection with the board.

[0048] It should be noted that the above board can be an integrated circuit board or a PCB board. The PCB board is used for electrical connection with the transformer. By connecting to the PCB board, the transformer leads out the coil windings to the PCB board to achieve electrical connection with other circuit components, thereby completing the transmission of electrical energy and the transfer of signals, and thus can convert the input voltage into the output voltage required by the circuit to meet the different voltage requirements of different circuit modules.

[0049] In this way, compared with the traditional secondary winding 30, the transformer provided by the embodiment of the present application designs the secondary winding 30 as a housing structure with a receiving cavity 33. The beneficial effects of such a transformer mainly include:

[0050] First, the secondary winding 30 is electrically connected to the board through the conductive inner core 32 and the conductive outer shell 31, and the primary winding 20 is electrically connected to the board. At the same time, the iron core 10 is located in the receiving cavity 33. When an alternating current passes through the primary winding 20, an alternating magnetic flux is generated in the iron core 10, so that a voltage is induced in the secondary winding 30 formed by the conductive inner core 32 and the conductive outer shell 31. In this way, the transformer completes the transmission of electrical energy and the transfer of signals through the connection with the board, thereby converting the input voltage into the output voltage required by the circuit to meet the different voltage requirements of different circuit modules;

[0051] Second, the conductive inner core 32 passes through the closed magnetic circuit formed in the iron core 10, which helps to concentrate the magnetic flux, reduce magnetic flux leakage, and make more magnetic flux close through the iron core 10, thereby improving the energy transmission efficiency of the transformer and reducing energy loss. At the same time, the special structural design of the conductive inner core 32 and the conductive outer shell 31 can also optimize the magnetic field distribution inside the transformer, make the magnetic field more uniform and stable, and help to improve the performance and reliability of the transformer;

[0052] Third, on the basis of achieving basic electrical performance, due to the special structure of the secondary winding 30 formed by the conductive inner core 32 and the conductive outer shell 31. Specifically, the main part of the secondary winding 30 is arranged outside the iron core 10 and the primary winding 20. Since the secondary winding 30 will generate heat when participating in the circuit, placing the main part of the secondary winding 30 on the outermost can play a role in increasing the heat dissipation area and facilitating heat dissipation, so that the transformer has good heat conduction and heat dissipation performance;

[0053] Fourth, since the iron core 10 and the primary winding 20 wound around the iron core 10 are integrally accommodated in the receiving cavity 33, that is, the conductive outer shell 31 of the secondary winding 30 integrally wraps the iron core 10 and the primary winding 20 from the outside. Therefore, this design not only has good shielding performance, enables the transformer to have good anti-interference and anti-magnetic and electrical leakage prevention capabilities, but also can play a role in protecting the internal components;

[0054] Fifthly, the overall structure of the transformer designed as above is compact, reducing the volume and being more conducive to the electrical connection with the board. The conductive outer shell 31 of the secondary winding 30 serves both as a wire and a protective shell, achieving multiple functions with one component. In addition, as a container, when potting encapsulation is required for the product applying this design, the conductive outer shell 31 can directly serve as the encapsulation container without additional molds and auxiliary materials, thus reducing the production cost to a certain extent.

[0055] In summary, the transformer designed as above, while ensuring the basic electrical performance, also takes into account a compact structure, small volume, low cost, and good thermal conductivity, heat dissipation, and shielding performance.

[0056] Please refer to Figure 4 simultaneously. The conductive outer shell 31 includes an annular enclosing plate 311 and a sealing plate 312 provided at the opening on one side of the annular enclosing plate 311. The sealing plate 312 is used to block the opening of the annular enclosing plate 311 on this side. The sealing plate 312 and the annular enclosing plate 311 form an accommodating cavity 33, and the iron core 10 is loaded into the accommodating cavity 33 from the opening on the other side of the annular enclosing plate 311.

[0057] In this embodiment, the annular enclosing plate 311 can be an enclosing plate with a rectangular cross-section. That is to say, the conductive outer shell 31 is specifically a cuboid shell with an opening on one side, and this cuboid shell has a cuboid accommodating cavity 33 to accommodate the primary winding 20 and the iron core 10.

[0058] With the above arrangement, the compact structure formed by the annular enclosing plate 311 and the sealing plate 312 not only enables the cuboid shell to better adapt to the limited space, is conducive to layout and installation on a compact circuit board, and facilitates electrical connection with the circuit board (the circuit board can be arranged on the opening side of the cuboid shell), but also is conducive to installing and matching the primary winding 20 and the iron core 10 to form a compact transformer structure.

[0059] Please refer to Figure 5 simultaneously. The secondary winding 30 is made of metal. The secondary winding 30 is a structure formed by punching, cutting, and bending a metal plate, enabling it to form a single-turn secondary coil. For example, it is formed by punching, cutting, and bending a whole piece of copper or aluminum plate. In this way, the conductive outer shell 31 can not only play the role of electromagnetic shielding (reducing the impact of electromagnetic interference generated during the operation of the transformer on the surrounding circuits and devices and preventing external electromagnetic interference from affecting the normal operation of the transformer), improving the electromagnetic compatibility of the entire system, but also further improve the thermal conductivity, and at the same time, the structural strength is enhanced due to the existence of the metal shell.

[0060] In this way, by folding and splicing, the annular enclosing plate 311, the sealing plate 312, and the conductive inner core 32 can be formed, which can simplify the manufacturing process, improve production efficiency and consistency, and reduce production costs.

[0061] As can be seen from the above, the annular shroud 311, the sealing plate 312, and the conductive inner core 32 are integrally formed structures made of metal material, and the conductive inner core 32 is integrally provided on the sealing plate 312.

[0062] Specifically, the sealing plate 312 includes two first sealing plate bodies 3121 and a second sealing plate body 3122 disposed between the two first sealing plate bodies 3121. The conductive inner core 32 includes two conductive core plates 321. The two conductive core plates 321 are respectively integrally provided on the two first sealing plate bodies 3121. The second sealing plate body 3122 and the two first sealing plate bodies 3121 are folded and joined to form the sealing plate 312, and the two conductive core plates 321 are overlapped to form the conductive inner core 32.

[0063] Compared with the conductive inner core 32 with a single plate structure, the conductive inner core 32 formed by overlapping two conductive core plates 321 has a greater current-carrying capacity and higher structural strength.

[0064] At the same time, the close connection between the conductive inner core 32 and the sealing plate 312 not only enables the conductive inner core 32 to form a good conduction path with the shroud and the sealing plate 312 on both sides thereof, but also enables heat to be conducted to the outer shell more quickly and then dissipated to the surrounding environment through the outer shell.

[0065] To ensure the stability of the conductive inner core 32 formed by overlapping two conductive core plates 321, a bent portion 3123 is provided at one end of the second sealing plate body 3122 close to the conductive inner core 32, and a card slot 3124 is provided in the bent portion 3123. After the two conductive core plates 321 are overlapped, they are clamped in the card slot 3124.

[0066] In this way, by overlapping the two conductive core plates 321 and clamping them in the card slot 3124, it is ensured that there will be no excessive gap between the two overlapped conductive core plates 321, and the effect of keeping them in close fit is always maintained.

[0067] The above-mentioned second sealing plate body 3122 is used to fill the vacancy left after the two first sealing plate bodies 3121 are joined. The second sealing plate body 3122 is rotatably provided on the annular shroud 311, which is beneficial to the disassembly and assembly of the secondary winding 30.

[0068] In some embodiments, the annular shroud 311 is an integrally folded and formed closed rectangular shroud, and the closed rectangular shroud includes a second shroud body 3112, two first shroud bodies 3111, and two third shroud bodies 3113.

[0069] Among them, two first enclosure body 3111 are respectively arranged on both sides of the conductive inner core 32 along the first direction (the so-called first direction refers to the thickness direction of the conductive inner core 32), the second enclosure body 3112 is arranged on one side of the conductive inner core 32 along the second direction perpendicular to the first direction (the so-called second direction refers to the width direction of the conductive inner core 32), and two third enclosure body 3113 are arranged on the other side of the conductive inner core 32 along the second direction perpendicular to the first direction. That is to say, the two third enclosure body 3113 are arranged on the opposite side of the second enclosure body 3112, and the two third enclosure body 3113 are respectively integrally arranged at one end of the two first enclosure body 3111 far away from the second enclosure body 3112.

[0070] The conductive inner core 32 and the two first enclosure body 3111 and the sealing plate 312 on its two sides form a good conductive path. For example, the conductive inner core 32 can be the signal input end for the secondary winding 30 to connect to the PCB board, the conductive housing 31 can be the signal output end for the secondary winding 30 to connect to the PCB board, and the sealing plate 312 is used to establish the conductive path between the conductive inner core 32 and the conductive housing 31, so as to facilitate the realization of the function of the secondary winding 30 to output voltage.

[0071] Compared with the split-type secondary winding 30, using the above-mentioned secondary winding 30 which is punched, cut and bent can reduce the resistance generated at the connection, so that the current carrying capacity is larger and the heat generation is less.

[0072] In some embodiments, the first pin portions 313 are provided on the first enclosure body 3111, the second enclosure body 3112 and the third enclosure body 3113, and the second pin portion 322 is provided on the conductive inner core 32. The first pin portions 313 and the second pin portion 322 are both used to connect to the board card.

[0073] In this embodiment, each first pin portion 313 can be set as a convex structure at one end of the corresponding enclosure body far away from the sealing plate 312, the second pin portion 322 can be a convex structure arranged at one end of the conductive inner core 32 far away from the sealing plate 312, and each first pin portion 313 forms an equipotential output point. Each first pin portion 313 and the second pin portion 322 can be welded to the pads of the PCB board to realize the electrical connection with the PCB board.

[0074] In some embodiments, the transformer further includes a bottom partition 40. The bottom partition 40 covers the surface of the primary winding 20 on the side close to the second pin portion 322. The bottom partition 40 is provided with a fixing hole 41 for fixing the wire end 21 of the primary winding 20 and an avoidance groove 42 for avoiding the second pin portion 322.

[0075] It can be seen that the bottom partition 40 can fix the wire ends 21 of the primary winding 20, limit the relative positions between the internal components of the transformer and the metal shell, and protect the upper surface of the exposed primary winding 20. At the same time, it can also separate the PCB board and the primary winding 20.

[0076] In this embodiment, the primary winding 20 is arranged in one or two groups. Please refer to Figure 6 together. The multi-turn coil can be divided into two groups. The two groups of primary windings 20 are respectively wound around the outside of the two core columns 12 of the iron core 10. Among them, the wire ends 21 on the right side of the two groups of primary windings 20 can be used as signal input ends connected to the PCB board, and the wire ends 21 on the left side of the two groups of primary windings 20 can be used as signal output ends connected to the PCB board. The two groups of primary windings 20 can be connected in parallel or in series according to the functions performed by the transformer.

[0077] It should be noted that Figure 6 the shown primary winding 20 is wound in a double-strand parallel winding form. The number of turns and the winding form here are only examples and are not limited. The two windings shown in the figure are to make full use of the space, and the wire type can be selected according to the requirements, such as Litz wire or enameled wire.

[0078] Please refer to Figure 7 and Figure 8 together. The transformer also includes two bobbin skeletons 50. The primary winding 20 is wound around the two bobbin skeletons 50, and the iron core 10 is embedded in the two bobbin skeletons 50 to fix the primary winding 20 and the iron core 10 and separate the primary winding 20 and the iron core 10.

[0079] Please refer to Figure 9 together. The iron core 10 includes two yokes 11 and two core columns 12 arranged at intervals. The two yokes 11 are respectively arranged at both ends of the two core columns 12.

[0080] It should be noted that the iron core 10 is the main magnetic path of the transformer, and its main function is to conduct magnetism. The iron core 10 can convert the electrical energy of the primary circuit (primary winding 20) into magnetic energy, and then convert the magnetic energy into the electrical energy of the secondary circuit (secondary winding 30). In this example, the iron core 10 adopts a square ring structure and can be spliced by four magnetic cores or spliced by one C-shaped and one I-shaped. The structure of the iron core 10 can be divided into two parts. The two core columns 12 are the parts for sleeving the primary winding 20, and the yokes 11 at both ends are the parts for closing the magnetic circuit.

[0081] Correspondingly, the bobbin skeleton 50 includes a skeleton body 51 and extension bodies 52 provided at both ends of the skeleton body 51. The skeleton body 51 is provided with an annular groove 511 for accommodating the winding of the primary winding 20 and a jack 512 for inserting the iron core column 12. The depths of the annular groove 511 and the jack 512 can be adjusted according to the sizes of the primary winding 20 and the iron core column 12 respectively. A hollow hole 513 is provided in the annular groove 511. The setting of the hollow hole 513 is conducive to heat dissipation and weight reduction. The extension bodies 52 on the same side of the two skeleton bodies 51 form a receiving space 521 for accommodating the yoke 11.

[0082] In some embodiments, two extension bodies 52 arranged up and down are provided at both ends of a single skeleton body 51. The extension body 52 has a triangular cross-section. In this way, there are two pairs (a total of four) of extension bodies 52 on the same side of the two skeleton bodies 51. The four extension bodies 52 are located at the four corner positions of the yoke 11 and are used for limit installation of the yoke 11 to ensure that the entire iron core 10 is embedded in the two bobbin skeletons 50.

[0083] It can be seen that the main function of the bobbin skeleton 50 is to carry the primary winding 20 and support the stable winding of the primary winding 20. To facilitate the limitation of the wound primary winding 20, the skeleton body 51 is provided with an annular groove 511 for accommodating the winding of the primary winding 20, and the jack 512 of the skeleton body 51 is used for inserting the iron core column 12. In this way, the setting of the bobbin skeleton 50 can physically isolate the primary winding 20 from the built-in iron core 10, prevent contact arcing, and is conducive to assembly during the production process.

[0084] Generally speaking, the bobbin skeleton 50 is made of insulating plastic material. Through processes such as injection molding, the hollow hole 513 in the skeleton body 51 can achieve the purpose of heat dissipation and weight reduction.

[0085] During installation, first, wind the litz wire or enameled wire or other insulated wire evenly on the corresponding bobbin skeleton 50 to form a complete and shaped primary winding 20. Then insert the fired iron core 10 (here, a combination of "C" type and "I" type magnetic cores) into the two bobbin skeletons 50 wound with the primary winding 20. After that, assemble the folded secondary winding 30 with the assembled iron core 10 and primary winding 20 as a whole, and finally install the insulating bottom partition 40.

[0086] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0087] The above has introduced the transformer provided by the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the solution of the present application and its core idea. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A transformer, characterized in that: include: Iron core; A primary winding, wound on the outside of the core, for electrical connection with the board; The secondary winding comprises a conductive shell and a conductive inner core arranged in the conductive shell, wherein the conductive shell has a receiving cavity for accommodating the iron core, and the conductive inner core passes through a closed magnetic circuit formed in the iron core. The conductive shell and the conductive inner core are used for electrical connection with a board.

2. The transformer according to claim 1, characterized in that The conductive shell includes an annular enclosure and a sealing plate arranged at an opening on one side of the annular enclosure, the sealing plate and the annular enclosure form the accommodating cavity, and the iron core is loaded into the accommodating cavity from the opening on the other side of the annular enclosure.

3. The transformer according to claim 2, characterized in that: The secondary winding is a structure formed by punching, cutting and bending a metal plate.

4. The transformer according to claim 3, characterized in that: The sealing plate includes two first sealing plate bodies and a second sealing plate body arranged between the two first sealing plate bodies, and the conductive inner core includes two conductive core plates, and the two conductive core plates are respectively integrally arranged on the two first sealing plate bodies, and the second sealing plate body and the two first sealing plate bodies are folded and spliced ​​to form the sealing plate, and the two conductive core plates are overlapped to form the conductive inner core.

5. The transformer according to claim 4, characterized in that A bending portion is provided at one end of the second sealing plate body close to the conductive inner core, and a clamping groove is provided on the bending portion. Two conductive core plates are clamped in the clamping groove after being overlapped.

6. The transformer according to claim 2, characterized in that The annular enclosure is a closed rectangular enclosure formed by folding in one piece, and the closed rectangular enclosure includes: Two first enclosure bodies are respectively arranged on two sides of the conductive inner core along the first direction; A second enclosure body is provided on one side of the conductive inner core along a second direction perpendicular to the first direction; Two third enclosure bodies are arranged on the other side of the conductive inner core along the second direction, and the two third enclosure bodies are respectively integrally arranged on the two first enclosure bodies.

7. The transformer according to claim 6, characterized in that The first enclosure body, the second enclosure body and the third enclosure body are each provided with a first pin portion, the conductive inner core is provided with a second pin portion, and the first pin portion and the second pin portion are both used for connecting to a board.

8. The transformer according to claim 7, characterized in that The transformer further includes a bottom partition, which covers a surface of the primary winding close to the second pin portion, and is provided with a fixing hole for fixing the wire end of the primary winding and an avoidance groove for avoiding the second pin portion.

9. The transformer according to claim 1, characterized in that: The transformer also includes two bobbin frames, the primary winding is wound on the two bobbin frames, and the iron core is embedded in the two bobbin frames to fix the primary winding and the iron core and separate the primary winding and the iron core.

10. The transformer according to claim 9, characterized in that The iron core comprises two iron yokes and two iron core columns arranged at intervals, and the two iron yokes are respectively arranged at the two ends of the two iron core columns; The bobbin skeleton includes a skeleton body and extended bodies arranged at both ends of the skeleton body. The skeleton body is provided with an annular groove for accommodating the primary winding and an insertion hole for inserting the iron core column. A hollow hole is provided in the annular groove. The extended bodies on the same side of the two skeleton bodies form a accommodating space for accommodating the iron yoke.

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