High-frequency high-power multi-group cascade transformer
By designing multiple independent high-frequency transformer structures and integrated series of secondary winding copper strips and cooling copper tubes, the problems of large core loss and unbalanced current of existing high-frequency and high-power transformers are solved, and a higher High-frequency, high-power multi-group cascade transformers with reliability and easy maintenance.
Patent Information
- Application Number
- CN202420974960.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-07
AI Technical Summary
The existing high-frequency and high-power transformers have large core losses and severe heat generation, uneven current of multiple sets of primary windings, inconvenient tap operation, and complex structure, resulting in high maintenance costs.
Design a high-frequency, high-power multi-group cascade transformer, adopting multiple independent transformer structures, each transformer has an independent skeleton and U-shaped magnetic core, the primary winding and the secondary winding are formed integrally through copper rows and cooling copper tubes. In series, reduce welding points, improve reliability, and adopt a modular design to facilitate mass production.
It reduces core loss, improves current balance and tap operation convenience, enhances structural reliability and production efficiency, and saves maintenance costs.
Smart Images
Figure CN222213888U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-frequency induction heating power supply isolation transformers in power electronics, and in particular to a high-frequency high-power multi-group cascade transformer used as a high-frequency current amplification isolation transformer in a high-frequency high-power induction heating power supply. Background Art
[0002] Conventional high-frequency high-power transformers mostly use multiple sets of primary windings wound on the same set of magnetic cores, and the secondary winding is a single-set structure. The magnetic flux of the transformer core with this structure is large, the core loss increases, the heat is serious, and the current of the multiple sets of primary windings of the transformer is unbalanced. Some windings are prone to overcurrent. If it is necessary to lead out taps on different turns of the primary winding of the transformer, it will be very inconvenient because the total height of the transformer is very high, the window size is small, the number of taps is large, and the lead-out length is also long. Utility Model Content
[0003] The purpose of the utility model is to solve the technical problems existing in the background technology, and for this purpose, a high-frequency, high-power, multi-group cascade transformer is provided.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0005] A high-frequency, high-power, multi-group cascade transformer, comprising a plurality of transformer structures;
[0006] Each transformer structure includes an independent frame, a primary winding and a U-shaped magnetic core, wherein the primary winding is fixedly mounted on the outside of the frame, one side of the U-shaped magnetic core is on the outside of the primary winding, and the other side of the U-shaped magnetic core is on the inside of the frame;
[0007] The upper and lower ends of the primary winding of each transformer structure are respectively welded with a first externally connected copper bar and a second externally connected copper bar;
[0008] The secondary winding copper bars of all transformer structures are integrally formed and connected in series. The secondary winding copper bars are located between the primary winding and the U-shaped magnetic core. A third externally connected copper bar is welded at the beginning of the series connection of the integrally formed series secondary winding copper bars, and a fourth externally connected copper bar is welded at the end of the series connection.
[0009] The following is a technical solution further defined by the present invention, wherein the primary winding is configured as a winding copper tube, and the upper and lower ends of the primary winding of each transformer structure are respectively fixedly connected to a first water connector and a second water connector.
[0010] The following is a technical solution further defined by the utility model, in which a secondary cooling copper tube is welded on the outer side of all secondary winding copper bars;
[0011] The secondary cooling copper tubes of the transformer structure on the same side are integrally formed and connected in series. The series start end of the integrally formed series secondary cooling copper tubes is fixedly connected to the first busbar, and the series end end is fixedly connected to the second busbar.
[0012] The following is a technical solution further defined by the present utility model, in which the outer side of the secondary winding copper bar is provided with a plurality of integrally formed secondary cooling copper tubes connected in series, and the plurality of integrally formed secondary cooling copper tubes connected in series are arranged in parallel up and down; the inlets and outlets of the plurality of integrally formed secondary cooling copper tubes connected in series are respectively collected and installed on the first busbar and the second busbar.
[0013] The following is a technical solution further defined by the present utility model: the upper end of the first manifold is fixedly connected to the third water connector, and the upper end of the second manifold is fixedly connected to the fourth water connector.
[0014] The following is a technical solution further defined by the present utility model. Each transformer structure includes a plurality of independent U-shaped magnetic cores, and the plurality of U-shaped magnetic cores are distributed circumferentially, and every two U-shaped magnetic cores form a pair of magnetic cores.
[0015] Compared with the prior art, the utility model has the following technical effects:
[0016] 1. Adopt multiple independent high-frequency transformer structure design
[0017] The high-frequency, high-power, multi-group cascade transformer designed by the utility model adopts multiple independent high-frequency transformer structure primary windings + independent magnetic core structures, and the primary winding of each transformer is independently connected to an inverter bridge of a high-frequency induction heating power supply.
[0018] 2. The secondary side structures of multiple high-frequency transformer structures are integrated into a series design
[0019] The high-frequency, high-power, multi-group cascade transformer designed by the utility model adopts the secondary side structures of multiple high-frequency transformer structures to be integrally formed in series, including the secondary side winding copper bar and the secondary side cooling copper tube are all integrally formed, without welding or overlapping structure in the middle, and has high reliability.
[0020] 3. Modular design, simple structure
[0021] The high-frequency, high-power, multi-group cascade transformer designed by the utility model has a modular structure, multiple primary winding structures are completely the same, can be mass-produced, is easy to install and maintain, and saves costs.
[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 It is a main structural schematic diagram of the utility model;
[0025] Figure 2 It is a schematic diagram of the top view structure of the utility model;
[0026] Figure 3 It is a left side structural schematic diagram of the utility model;
[0027] Figure 4 yes Figure 2 AA section view in;
[0028] Figure 5 yes Figure 1 BB cross-section diagram in.
[0029] Figure numerals: 1. U-shaped magnetic core; 2. Secondary winding copper bar; 3. Secondary cooling copper tube; 4. First external connection copper bar; 5. Second external connection copper bar; 6. Third external connection copper bar; 7. Fourth external connection copper bar; 8. First busbar; 9. Primary winding; 10. Frame; 11. Third water connector; 12. First water connector; 13. Second water connector; 14. Second busbar; 15. Fourth water connector. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0032] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.
[0034] like Figure 1-5 As shown, a high-frequency, high-power, multi-group cascade transformer is provided, which can be divided into multiple transformer structures, wherein there are at least 2 transformer structures, and in this embodiment, there are 4 transformer structures.
[0035] Each transformer structure includes an independent frame 10, a primary winding 9 and a U-shaped magnetic core 1. A copper tube is led out from the top of the primary winding 9 of each transformer structure to weld a first external connection copper bar 4, and a copper tube is led out from the bottom to weld a second external connection copper bar 5, which is used for external electrical connection of the primary winding 9 of the transformer.
[0036] The primary winding 9 is configured as a hollow winding copper tube. The primary winding 9 of each transformer structure is provided with a first water joint 12 at an upper end and a second water joint 13 at a lower end, and water is passed through the primary winding 9 for cooling.
[0037] The secondary winding copper bars 2 of all transformer structures are integrally formed and connected in series. After the secondary winding copper bars 2 of all transformer structures are cascaded (i.e. connected in series), a third external connection copper bar 6 and a fourth external connection copper bar 7 are led out at both ends for output electrical connection of the secondary winding copper bars 2 of the transformer.
[0038] Multiple secondary cooling copper tubes 3 are designed on the outside of the secondary winding copper bar 2 of all transformer structures. Figure 2 and 5 As shown, the secondary cooling copper tubes 3 of the transformer structure on the same side are integrally formed and connected in series, and two transformer structures are provided on the same side. The secondary cooling copper tubes 3 of the transformer structure on the same side are cascaded (i.e. connected in series) and fixedly connected to the first busbar 8 and the second busbar 14 at both ends.
[0039] like Figure 1 and 4 As shown, there are 5 integrally formed secondary cooling copper tubes 3 connected in series on the outside of the secondary winding copper bar 2, and the 5 integrally formed secondary cooling copper tubes 3 connected in series are arranged in parallel up and down; the inlets and outlets of the 5 integrally formed secondary cooling copper tubes 3 connected in series are respectively collected and installed on the first bus 8 and the second bus 14.
[0040] A third water joint 11 is welded to the upper end of the first manifold 8 , and a fourth water joint 15 is welded to the upper end of the second manifold 14 , for passing water through the secondary cooling copper tube 3 for cooling.
[0041] Each transformer structure has a plurality of independent U-shaped magnetic cores 1, and the plurality of U-shaped magnetic cores 1 are distributed circumferentially, and every two U-shaped magnetic cores 1 form a pair of magnetic cores. Each transformer can be designed with a plurality of pairs of magnetic cores.
[0042] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the utility model without departing from the content of the technical solution of the utility model should be included in the protection scope of the utility model.
Claims
1. A high-frequency, high-power, multi-group cascade transformer, characterized in that: including a plurality of transformer structures; Each transformer structure comprises an independent frame (10), a primary winding (9) and a U-shaped magnetic core (1), wherein the primary winding (9) is fixedly mounted on the outside of the frame (10), one side of the U-shaped magnetic core (1) is located on the outside of the primary winding (9), and the other side of the U-shaped magnetic core (1) is located on the inside of the frame (10); A first externally connected copper bar (4) and a second externally connected copper bar (5) are respectively welded to the upper and lower ends of the primary winding (9) of each transformer structure; The secondary winding copper bars (2) of all transformer structures are integrally formed and connected in series. The secondary winding copper bars (2) are located between the primary winding (9) and the U-shaped magnetic core (1). A third externally connected copper bar (6) is welded at the beginning of the series connection of the integrally formed series-connected secondary winding copper bars (2), and a fourth externally connected copper bar (7) is welded at the end of the series connection.
2. A high-frequency, high-power, multi-group cascade transformer as claimed in claim 1, characterized in that: The primary winding (9) is configured as a winding copper tube, and the upper and lower ends of the primary winding (9) of each transformer structure are respectively fixedly connected to a first water connector (12) and a second water connector (13).
3. A high-frequency, high-power, multi-group cascade transformer as claimed in claim 1, characterized in that: Secondary cooling copper tubes (3) are welded to the outer sides of all secondary winding copper bars (2); The secondary cooling copper tubes (3) of the transformer structure on the same side are integrally formed and connected in series, the series start end of the integrally formed secondary cooling copper tubes (3) is fixedly connected to the first collector tube (8), and the series end end is fixedly connected to the second collector tube (14).
4. A high-frequency, high-power, multi-group cascade transformer as claimed in claim 3, characterized in that: The outer side of the secondary winding copper bar (2) is provided with a plurality of secondary cooling copper tubes (3) integrally formed in series, and the plurality of secondary cooling copper tubes (3) integrally formed in series are arranged in parallel up and down; the inlets and outlets of the plurality of secondary cooling copper tubes (3) integrally formed in series are respectively collected and installed on the first manifold (8) and the second manifold (14).
5. A high-frequency, high-power, multi-group cascade transformer as claimed in claim 4, characterized in that: The upper end of the first conduit (8) is fixedly connected to the third water connector (11), and the upper end of the second conduit (14) is fixedly connected to the fourth water connector (15).
6. A high-frequency, high-power, multi-group cascade transformer as claimed in claim 1, characterized in that: Each transformer structure comprises a plurality of independent U-shaped magnetic cores (1), the plurality of U-shaped magnetic cores (1) are distributed in a circumferential direction, and every two U-shaped magnetic cores (1) form a pair of magnetic cores.