Three-phase high-frequency transformer multi-magnetic core combined connection structure

Abstract

This invention discloses a multi-core combined connection structure for a three-phase high-frequency transformer, belonging to the technical field of multi-core combined connection structures. Each E-shaped core is wound with three sets of coils, A, B, and C. The three-phase magnetic fluxes A, B, and C pass through the same core with a 120° phase difference. Therefore, there is not only an electrical connection but also a magnetic connection between the phases. Due to the magnetic connection between the phases, even if there is a short-circuit fault in one phase of the circuit, the internal magnetic fields of the transformer will mutually hinder the sudden change in current, and the other two phases will not be severely unbalanced, reducing the risk of secondary damage to the circuit system. Coils are wound on both the central and side columns of the core, resulting in high space utilization and improved power density of the transformer. It can be connected according to different requirements such as Yy, Yd, and Dy, and the connection method is flexible and varied.

Description

Technical Field

[0001] This invention relates to a multi-core combined connection structure, and more particularly to a multi-core combined connection structure for a three-phase high-frequency transformer, belonging to the technical field of multi-core combined connection structures. Background Technology

[0002] In high-frequency magnetic components, when a transformer needs to be three-phase with a large capacity or special dimensions, multiple sets of coils and magnetic cores are required to form a three-phase transformer. The general method is to fabricate three independent single-phase transformers and then combine them according to different connection methods to form the required three-phase transformer, as shown in the instruction manual. Figure 1 Taking the YyO connection as an example and attached Figure 2 ;

[0003] However, existing technologies have the following problems:

[0004] 1. Each magnetic core is wound with only a single set of coils. The three-phase magnetic circuits A / B / C are relatively independent, and there is only an electrical connection between the phases, not a magnetic connection.

[0005] 2. If one phase of the circuit fails, it will cause severe uneven loading on the other two phases, resulting in secondary damage to the circuit system;

[0006] 3. The coil is only wound in the column of the magnetic core, resulting in low space utilization and a large transformer size;

[0007] To address this issue, a multi-core combined connection structure for a three-phase high-frequency transformer is designed to optimize the aforementioned problems. Summary of the Invention

[0008] The main objective of this invention is to provide a multi-core combined connection structure for a three-phase high-frequency transformer. Each E-shaped core is wound with three sets of coils, A / B / C. The three-phase magnetic fluxes A / B / C pass through the same core with a phase difference of 120°, so there is not only an electrical connection between the phases, but also a magnetic connection.

[0009] Because of the magnetic connection between phases, even if one phase of the circuit is short-circuited, the magnetic fields inside the transformer will mutually hinder the sudden change in current, and the other two phases will not be severely unbalanced, reducing the risk of secondary damage to the circuit system.

[0010] By winding coils on both the central and side columns of the magnetic core, the space utilization is large and the power density of the transformer is improved.

[0011] It can be connected according to different requirements such as Yy, Yd, Dy, etc., and the connection method is flexible and varied.

[0012] The objective of this invention can be achieved by adopting the following technical solution:

[0013] A multi-core combined connection structure for a three-phase high-frequency transformer includes a three-phase transformer E-type core one, a three-phase transformer E-type core two, and a three-phase transformer E-type core three;

[0014] The three-phase transformer E-type magnetic core one, three-phase transformer E-type magnetic core two and three-phase transformer E-type magnetic core three have N14 coil, N15 coil, N16 coil, N24 coil, N25 coil, N26 coil, N34 coil, N35 coil and N36 coil wound above the side column and middle column;

[0015] The three-phase transformer E-type magnetic core one, three-phase transformer E-type magnetic core two and three-phase transformer E-type magnetic core three have N11 coil, N12 coil, N13 coil, N21 coil, N22 coil, N23 coil, N31 coil, N32 coil and N33 coil wound below the side column and middle column;

[0016] The secondary coils on the three-phase transformer E-type magnetic core one, three-phase transformer E-type magnetic core two, and three-phase transformer E-type magnetic core three are electrically connected to each other, and the primary coils on the three-phase transformer E-type magnetic core one, three-phase transformer E-type magnetic core two, and three-phase transformer E-type magnetic core three are electrically connected to each other to form an electrical connection structure of YyO, Yy, Yd, or Dy.

[0017] Preferably, terminal 2 of coil N14 is electrically connected to terminal 1 of coil N25;

[0018] Terminal 2 of coil N15 is electrically connected to terminal 1 of coil N26;

[0019] Terminal 2 of coil N16 is electrically connected to terminal 1 of coil N24.

[0020] Preferably, terminal 2 of coil N24 is electrically connected to terminal 1 of coil N35;

[0021] Terminal 2 of coil N25 is electrically connected to terminal 1 of coil N36;

[0022] Terminal 2 of coil N26 is electrically connected to terminal 1 of coil N34.

[0023] Preferably, the two terminals of coils N34, N35 and N36 are electrically connected to each other.

[0024] Preferably, terminal 2 of coil N11 is electrically connected to terminal 1 of coil N22;

[0025] Terminal 2 of coil N12 is electrically connected to terminal 1 of coil N23;

[0026] Terminal 2 of coil N13 is electrically connected to terminal 1 of coil N21.

[0027] Preferably, terminal 2 of coil N21 is electrically connected to terminal 2 of coil N32;

[0028] Terminal 2 of coil N22 is electrically connected to terminal 2 of coil N33;

[0029] The second terminal of the N23 coil is electrically connected to the second terminal of the N31 coil.

[0030] Preferably, terminals 1 of coils N31, N32, and N33 are electrically connected to each other.

[0031] Beneficial technical effects of the present invention:

[0032] The present invention provides a multi-core combined connection structure for a three-phase high-frequency transformer. Each E-shaped core is wound with three sets of coils A, B, and C. The three-phase magnetic fluxes A, B, and C pass through the same core with a phase difference of 120°. Therefore, there is not only an electrical connection between the phases, but also a magnetic connection.

[0033] Because of the magnetic connection between phases, even if one phase of the circuit is short-circuited, the magnetic fields inside the transformer will mutually hinder the sudden change in current, and the other two phases will not be severely unbalanced, reducing the risk of secondary damage to the circuit system.

[0034] By winding coils on both the central and side columns of the magnetic core, the space utilization is large and the power density of the transformer is improved.

[0035] It can be connected according to different requirements such as Yy, Yd, Dy, etc., and the connection method is flexible and varied. Attached Figure Description

[0036] Figure 1 This is a connection diagram for a three-phase transformer using existing technology.

[0037] Figure 2 For existing electrical schematics;

[0038] Figure 3 This is a circuit diagram of a preferred embodiment of the three-phase high-frequency transformer with multi-core YyO connection.

[0039] Figure 4 This is a simplified electrical schematic diagram of a preferred embodiment of the present invention, showing a multi-core YyO connection of a three-phase high-frequency transformer.

[0040] Figure 5 This is a simplified electrical schematic diagram of a preferred embodiment of the present invention, showing a three-phase high-frequency transformer with a multi-core Yy connection.

[0041] Figure 6 This is a simplified electrical schematic diagram of a preferred embodiment of the present invention, showing a three-phase high-frequency transformer with a multi-core Yd connection.

[0042] Figure 7This is a simplified electrical schematic diagram of a preferred embodiment of the present invention, showing a three-phase high-frequency transformer with a multi-core combination and Dy connection.

[0043] In the diagram: 1 - Three-phase transformer E-type magnetic core one, 2 - Three-phase transformer E-type magnetic core two, 3 - Three-phase transformer E-type magnetic core three. Detailed Implementation

[0044] To enable those skilled in the art to understand the technical solution of the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0045] like Figures 3-7 As shown, this embodiment provides a multi-core combined connection structure for a three-phase high-frequency transformer, including a three-phase transformer E-type core 1, a three-phase transformer E-type core 2, and a three-phase transformer E-type core 3.

[0046] The side posts and center posts of three-phase transformer E-type magnetic core 1, three-phase transformer E-type magnetic core 2 and three-phase transformer E-type magnetic core 3 are wound with N14 coil, N15 coil, N16 coil, N24 coil, N25 coil, N26 coil, N34 coil, N35 coil and N36 coil.

[0047] The side posts and center posts of three-phase transformer E-type magnetic core 1, three-phase transformer E-type magnetic core 2 and three-phase transformer E-type magnetic core 3 are wound with N11 coil, N12 coil, N13 coil, N21 coil, N22 coil, N23 coil, N31 coil, N32 coil and N33 coil.

[0048] The secondary coils on three-phase transformer E-type core 1, three-phase transformer E-type core 2, and three-phase transformer E-type core 3 are electrically connected to each other, and the primary coils on three-phase transformer E-type core 1, three-phase transformer E-type core 2, and three-phase transformer E-type core 3 are electrically connected to each other to form an electrical connection structure of YyO, Yy, Yd, or Dy.

[0049] In an E-shaped magnetic core (where the cross-sectional area of ​​the center column is twice that of the side columns), the center column is wound with coils, and the side columns are also wound with coils. This utilizes the winding space of the side columns, and the three-phase coils A / B / C are distributed on each set of magnetic cores, so that the phases are connected not only electrically but also magnetically. Finally, the coils are connected according to different connection methods such as Yy, Yd, and Dy to obtain the required three-phase transformer. The connection method is versatile and flexible.

[0050] In an E-shaped magnetic core (where the cross-sectional area of ​​the center column is twice that of the side columns), coils are wound around the center column and the side columns respectively. The number of coils on the primary side is the same on both the center column and the side columns, and the number of coils on the secondary side is the same on both the center column and the side columns.

[0051] In this embodiment, terminal 2 of coil N14 is electrically connected to terminal 1 of coil N25;

[0052] Terminal 2 of coil N15 is electrically connected to terminal 1 of coil N26;

[0053] Terminal 2 of coil N16 is electrically connected to terminal 1 of coil N24.

[0054] In this embodiment, terminal 2 of coil N24 is electrically connected to terminal 1 of coil N35;

[0055] Terminal 2 of coil N25 is electrically connected to terminal 1 of coil N36;

[0056] Terminal 2 of coil N26 is electrically connected to terminal 1 of coil N34.

[0057] In this embodiment, the two terminals of coils N34, N35, and N36 are electrically connected to each other.

[0058] In this embodiment, terminal 2 of coil N11 is electrically connected to terminal 1 of coil N22;

[0059] Terminal 2 of coil N12 is electrically connected to terminal 1 of coil N23;

[0060] Terminal 2 of coil N13 is electrically connected to terminal 1 of coil N21.

[0061] In this embodiment, terminal 2 of coil N21 is electrically connected to terminal 2 of coil N32;

[0062] Terminal 2 of coil N22 is electrically connected to terminal 2 of coil N33;

[0063] The second terminal of the N23 coil is electrically connected to the second terminal of the N31 coil.

[0064] In this embodiment, terminals 1 of coils N31, N32, and N33 are electrically connected to each other.

[0065] Each group of magnetic cores and coils is connected according to different connection methods to obtain the required transformer, see... Figure 2 .

[0066] Taking the YyO connection as an example, such as Figure 3 ,set up:

[0067] The potential generated by N1 is F1.

[0068] The potential generated by N2 is E2.

[0069] The potential generated by N3 is E3.

[0070] The phase voltage (P1-N) of phase A on the primary side is UA.

[0071] The phase voltage (P2-N) of phase B on the primary side is UB.

[0072] The primary side C-phase voltage (P3-N) is UC.

[0073] The phase voltage (S1-n) of phase A on the secondary side is Ua.

[0074] The secondary side phase B phase voltage (S2-n) is Ub.

[0075] The secondary side C-phase voltage (S3-n) is Uc.

[0076] Connect coil N1 of primary side group one to N2 of group two and N3 of group three to form phase A. Since the cross-sectional area of ​​the magnetic core side column is 1 / 2 of the middle column, the potential generated by N1 and N3 is 1 / 2 of N2, that is, F1 = E3 = E2 / 2. Therefore, the final phase voltage UA of primary side phase A is twice the electromotive force E2 generated by N2, that is, UA = 2E2 = 4E1 = 4E3. Similarly, UB = UC = UA = 2E2 = 4E1 = 4E3.

[0077] Similarly, for the secondary edge, Ua = Ub = Uc.

[0078] The above are merely further embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A multi-core combined connection structure for a three-phase high-frequency transformer, characterized in that: Including three-phase transformer E-type magnetic core one (1), three-phase transformer E-type magnetic core two (2) and three-phase transformer E-type magnetic core three (3); The three-phase transformer E-type magnetic core one (1), three-phase transformer E-type magnetic core two (2) and three-phase transformer E-type magnetic core three (3) are arranged in order from left to right; The three-phase transformer E-type magnetic core one (1) has an N14 coil wound above the left column, an N15 coil wound above the middle column, an N16 coil wound above the right column, an N24 coil wound above the left column, an N25 coil wound above the middle column, an N26 coil wound above the right column, an N34 coil wound above the left column, an N35 coil wound above the middle column, and an N36 coil wound above the right column. The three-phase transformer E-type magnetic core one (1) has an N11 coil wound below the left column, an N12 coil wound below the middle column, an N13 coil wound below the right column, an N21 coil wound below the left column, an N22 coil wound below the middle column, an N23 coil wound below the right column, an N31 coil wound below the left column, an N32 coil wound below the middle column, and an N33 coil wound below the right column. Terminal 2 of N14 coil is electrically connected to terminal 1 of N25 coil; Terminal 2 of coil N15 is electrically connected to terminal 1 of coil N26; Terminal 2 of coil N16 is electrically connected to terminal 1 of coil N24; Terminal 2 of the N24 coil is electrically connected to terminal 1 of the N35 coil; Terminal 2 of coil N25 is electrically connected to terminal 1 of coil N36; Terminal 2 of coil N26 is electrically connected to terminal 1 of coil N34; Terminal 2 of coils N34, N35, and N36 are electrically connected to each other; Terminal 2 of coil N11 is electrically connected to terminal 1 of coil N22; Terminal 2 of coil N12 is electrically connected to terminal 1 of coil N23; Terminal 2 of coil N13 is electrically connected to terminal 1 of coil N21; Terminal 2 of coil N21 is electrically connected to terminal 2 of coil N32; Terminal 2 of coil N22 is electrically connected to terminal 2 of coil N33; Terminal 2 of coil N23 is electrically connected to terminal 2 of coil N31; Terminal 1 of coils N31, N32, and N33 is electrically connected to each other.

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