High frequency conversion transformer

Abstract

The invention provides a high-frequency-conversion transformer, and belongs to the technical field of electromagnetism, the transformer comprises two pairs of magnetic cores which are of an annular structure and are arranged in parallel; the primary winding is wound on the magnetic core; the secondary winding comprises a row of U-shaped copper blocks arranged in an array mode, two supporting arms of each U-shaped copper block are arranged at the annular hollow positions of the two magnetic cores in a penetrating mode respectively, and the supporting arms, penetrating out of the same side of the magnetic cores, of all the U-shaped copper blocks are connected with the same first conductive plate. By using the scheme provided by the invention, the leakage inductance can be reduced, the loss is reduced and the power density is improved.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic technology, and in particular relates to a high frequency conversion transformer. Background Technology

[0002] In switching power supply design, designing small-size, high-power-density, low-cost, and high-reliability products has always been the direction of power supply design, and magnetic core devices play a crucial role.

[0003] Currently, most high-current high-frequency transformers use multiple high-frequency transformers connected in parallel, with each transformer having its own magnetic core. This allows the primary coil to be wound evenly and tightly around the core, with the secondary coil surrounding it. The secondary coil consists of copper tubes and conductive sheets. Due to the proximity effect, current flows closer to the inside of the primary coil winding, resulting in high losses. The secondary coil uses copper tubes of varying sizes, and the different positions and paths of the secondary coils lead to varying leakage inductance. A larger leakage inductance results in a higher peak value in the subsequent rectifier diodes, and the inconsistent leakage inductance necessitates the installation of a peak value matching device on the RC diodes. Furthermore, this also brings a series of problems such as large power module size, high cost, and low power density. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a high-frequency conversion transformer that can reduce leakage inductance, decrease losses, and increase power density.

[0005] In order to achieve the objective of this invention, the following solution is proposed: A high-frequency transformer, comprising: The magnetic core is provided in two parallel sets, both of which are ring-shaped and include two parallel straight sections and a connecting section connecting the two ends of the straight sections. The primary winding is wound around the magnetic core; The secondary winding includes U-shaped copper blocks arranged in an array along the length of the straight section of the magnetic core. The two arms of the U-shaped copper blocks pass through the annular hollow of the two secondary magnetic cores, and all the U-shaped copper blocks are connected to the same first conductive plate through the arms on the same side of the magnetic core.

[0006] Furthermore, the primary winding is wound in one of the following ways: When winding a section, the primary winding is wound on the adjacent straight sections of the two magnetic cores; When winding two sections, the primary winding is wound on the straight sections outside the two magnetic cores respectively; When winding three sections, the primary winding is wound around the straight sections outside the two magnetic cores and the adjacent straight sections of the two magnetic cores, respectively. When winding four segments, the primary winding is wound around the four straight segments of the two magnetic cores respectively.

[0007] Furthermore, a heat dissipation frame is provided between two adjacent magnetic cores. The heat dissipation frame has a U-shaped cross-section. The openings of the two heat dissipation frames on the same magnetic core are arranged opposite each other. The primary winding is wrapped around the heat dissipation frame. One of the support arms of the heat dissipation frame has an L-shaped support plate at its end. One vertical end of the support plate is connected to the corresponding support arm of the heat dissipation frame, and the outer side of the horizontal part of the support plate is connected to the first heat sink. Furthermore, thermally conductive potting compound is used to fill the gaps between the primary winding, secondary winding, magnetic core, and heat dissipation frame.

[0008] Furthermore, the magnetic core is provided with four first conductive plates on the upper and lower sides. The opening directions of two adjacent U-shaped copper blocks are arranged in opposite directions. The two first conductive plates on the upper side and the U-shaped copper blocks connected to them form the first secondary winding, and the two first conductive plates on the lower side and the U-shaped copper blocks connected to them form the second secondary winding.

[0009] Furthermore, the outer end of one first conductive plate of the first secondary winding serves as the head of the first secondary winding, and the outer end of the other first conductive plate of the first secondary winding serves as the tail of the first secondary winding. The end of one first conductive plate of the second secondary winding corresponding to the lower end of the head of the first secondary winding serves as the tail of the second secondary winding, and the end of the other first conductive plate corresponding to the lower end of the tail of the first secondary winding serves as the head of the second secondary winding. When the tail of the first secondary winding and the head of the second secondary winding are short-circuited, the tail of the first secondary winding and the head of the second secondary winding serve as the center tap.

[0010] Furthermore, both the outer wall of the U-shaped copper block of the first secondary winding and the second secondary winding are provided with protruding plates. The protruding plates of all the U-shaped copper blocks of the first secondary winding are connected to a second conductive plate to form the third secondary winding. The protruding plates of all the U-shaped copper blocks of the second secondary winding are connected to another second conductive plate to form the fourth secondary winding.

[0011] Furthermore, using the symmetrical plane of the two arms of the U-shaped copper block as the dividing plane, the third secondary winding and the fourth secondary winding are each divided into two parts, namely the third-1 secondary winding and the third-2 secondary winding; the fourth-1 secondary winding and the fourth-2 secondary winding are connected, the third-1 secondary winding and the fourth-1 secondary winding are connected, and the connection structure formed by the third-1 secondary winding and the fourth-1 secondary winding is symmetrical with the connection structure formed by the third-2 secondary winding and the fourth-2 secondary winding.

[0012] Furthermore, the outer end of the first conductive plate located on the upper left side of the dividing surface serves as the head of the III-1 secondary winding; the connection point between the lower second conductive plate and one end of the corresponding convex plate serves as the tail of the III-1 secondary winding; the connection point between the lower second conductive plate and the other end of the corresponding convex plate serves as the head of the III-2 secondary winding; the outer end of the other first conductive plate located on the upper right side of the dividing surface serves as the tail of the III-2 secondary winding; and the outer end of the first conductive plate located on the lower left side of the dividing surface serves as the tail of the IV-1 secondary winding. One end of the second conductive plate and the corresponding convex plate at the end of the winding serves as the head of the N-1 secondary winding. One end of the second conductive plate and the corresponding convex plate at the upper end serves as the tail of the N-2 secondary winding. The outer end of the other first conductive plate located on the lower right side of the dividing surface serves as the head of the N-2 secondary winding. The tail of the N-1 secondary winding, the head of the N-1 secondary winding, the tail of the III-1 secondary winding, and the head of the III-1 secondary winding are connected in sequence, and the head of the N-1 secondary winding and the tail of the III-1 secondary winding are center taps.

[0013] Furthermore, one of the racetrack-shaped magnetic cores has a third conductive plate on its outer side. When the transformer is rectified in full-wave rectification, the tail of the I secondary winding and the head of the II secondary winding are connected to the third conductive plate, which is the negative pole. When the transformer is rectified in bridge rectification, the third conductive plate is a turn-to-turn shorting bar.

[0014] The beneficial effects of this invention are as follows: 1. The array of U-shaped copper blocks reduces winding losses. The primary winding is wound on different core columns of the EE-type magnetic core to achieve integer and fractional turns, thus adapting to various voltage levels. Heat dissipation skeletons are set in the vertical part of the two racetrack-shaped magnetic cores to improve heat dissipation and thus increase power density. 2. The two sets of secondary windings are symmetrical in both the top and bottom and the left and right sides, so that the leakage inductance and impedance of the two sets of secondary windings to the primary winding are equal, which is beneficial to the current sharing of the two sets of secondary windings and the consistency of RC absorption of the subsequent rectifier tube. 3. By winding the primary winding around the side post of the EE-type magnetic core, the winding presents a "sandwich" structure of primary winding-secondary winding-primary winding, thereby reducing leakage inductance and winding losses. By shorting the head and tail of multiple sets of secondary windings, the rectification mode can be changed between full wave and full bridge, so as to achieve switching between high, medium and low voltage. Attached Figure Description

[0015] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of the invention.

[0016] Figure 1 A three-dimensional structural schematic diagram of the transformer of this application is shown.

[0017] Figure 2The diagram shows four winding configurations of the primary winding of this application, where a is the middle post of the EE type magnetic core, b is wound around the side post of the EE type magnetic core, c is wound around both the middle post and side post of the EE type magnetic core, and d is wound around all straight segments of both magnetic cores 1.

[0018] Figure 3 A three-dimensional structural schematic diagram of the transformer with two secondary windings of this application is shown.

[0019] Figure 4 This application shows Figure 3 A three-dimensional diagram of the explosion.

[0020] Figure 5 A schematic diagram of the secondary winding of this application is shown.

[0021] Figure 6 A schematic diagram of the secondary winding 2 of this application is shown.

[0022] Figure 7 A three-dimensional structural schematic diagram of the 0.5-turn + 0.5-turn transformer of this application is shown.

[0023] Figure 8 This application shows Figure 7 A three-dimensional diagram of the explosion.

[0024] Figure 9 A schematic diagram of the structure of the secondary winding A of this application is shown.

[0025] Figure 10 A schematic diagram of the structure of the secondary winding B of this application is shown.

[0026] Figure 11 A schematic diagram of a single-winding bridge rectifier transformer of this application is shown.

[0027] Figure 12 The full-wave rectification topology of this application is shown.

[0028] Figure 13 The schematic diagram of the full-wave rectifier 1-turn + 1-turn transformer of this application is shown.

[0029] Figure 14 The schematic diagram of the full-wave rectifier 0.5-turn + 0.5-turn transformer of this application is shown.

[0030] Figure 15 The full-wave rectifier circuit of this application is shown.

[0031] Figure 16 The full-bridge rectifier circuit of this application is shown.

[0032] Figure 17 The schematic diagram of the bridge rectifier transformer with two secondary windings in series according to this application is shown.

[0033] Figure 18 The schematic diagram of the two-side-winding parallel bridge circuit transformer of this application is shown.

[0034] The diagram shows the following markings: racetrack-shaped magnetic core-1, heat dissipation frame-11, support plate-12, primary winding-2, secondary winding-3, secondary winding-1-31, head of secondary winding-1-311, tail of secondary winding-1-312, secondary winding-2-32, tail of secondary winding-2-321, head of secondary winding-2-322, secondary winding-33, secondary winding-331, head of secondary winding-3311, tail of secondary winding-3312, secondary winding-2-332, and so on. III-2 secondary winding head-3321, III-2 secondary winding tail-3322, IV secondary winding-34, IV-1 secondary winding-341, IV-1 secondary winding head-3411, IV-1 secondary winding tail-3412, IV-2 secondary winding-342, IV-2 secondary winding tail-3421, IV-2 secondary winding head-3422, U-shaped copper block-35, first conductive plate-36, second radiator-4, radiator-5, convex plate-6, second conductive plate-7, third conductive plate-8. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0036] like Figures 1-18 As shown, this embodiment provides a high-frequency conversion transformer, including a magnetic core 1, a primary winding 2, and a secondary winding 3. The transformer connection principle is as follows. Figure 11 As shown.

[0037] Specifically, such as Figure 1 As shown, the magnetic core 1 has a ring structure and two sets are arranged in parallel. In this embodiment, the magnetic core 1 has the following structure as an example: the magnetic core 1 includes two parallel straight sections and two connecting sections that connect the two ends of the two straight sections respectively. The two sets of magnetic cores 1 form an EE type magnetic core. The primary winding 2 is wound on at least one straight section of the magnetic core 1.

[0038] like Figure 2 As shown, the primary winding 2 can be wound in the following ways: 1. The primary winding 2 is wound in a section outside the two adjacent straight sections of the two magnetic cores 1, and the area covered by the primary winding 2 covering the straight sections of the two magnetic cores 1 is called the EE type magnetic core center column. This winding method is called the center column winding. 2. The primary winding 2 is wound in two sections and wound on the straight sections outside the two magnetic cores 1 respectively. The area covered by the primary winding 2 of the two magnetic cores 1 is called the EE type magnetic core side column. This winding method is called side column winding. 3. The primary winding 2 is wound in three sections, and then wound on the middle column and the side column of the EE type magnetic core respectively; Fourth, the primary winding 2 is wound in four sections, and then wound on the four straight sections of the two magnetic cores 1 respectively, so that integer turns and fractional turns can be easily achieved to suit various voltage levels.

[0039] In this embodiment, the primary winding 2 is wound simultaneously around the central column and the side column of two magnetic cores 1 as an example.

[0040] A set of heat dissipation frames 11 is provided on the upper and lower sides of the primary winding 2 and the straight section of the magnetic core 1 on which the primary winding 2 is wound. The cross-section of the heat dissipation frame 11 is U-shaped, and the openings of the set of heat dissipation frames 11 on the same straight section of the magnetic core 1 are arranged opposite to each other.

[0041] One end of one of the arms of the heat dissipation frame 11 is provided with an L-shaped support plate 12. The support plate 12 is horizontally arranged. The end of the vertical part of the support plate 12 away from its horizontal part is connected to one end of one of the arms of the heat dissipation frame 11. The outer wall of the horizontal part of the support plate 12 is connected to the heat sink 5 so that one side of the heat dissipation frame 11 is in contact with the straight section of the magnetic core 1 and the other side is in contact with the corresponding primary winding 2. The heat on the primary winding 2 and the magnetic core 1 can be conducted to the heat sink 5 through the support plate 12 at the same time, so as to facilitate heat dissipation and improve the heat dissipation effect of the transformer.

[0042] The secondary winding 3 includes a U-shaped copper block 35 and two first conductive plates 36. The U-shaped copper block 35 is arranged in an array along the straight section of the magnetic core 1, and the two side arms of the U-shaped copper block 35 are respectively inserted through the hollow middle part of the two secondary magnetic cores 1, so that the U-shaped copper block 35 forms a separate winding. Compared with the overall winding, this structure is composed of multiple U-shaped copper blocks 35 arranged at equal intervals. Under the same cross-sectional area, the surface area is increased, thereby increasing the conductive area and reducing the winding loss.

[0043] The arms on the same side of the U-shaped copper block 35 are connected to the same first conductive plate 36, so that the secondary winding 3 has a Z-shaped structure. The end of the first conductive plate 36 away from the U-shaped copper block 35 is connected to the second heat sink 4, thereby removing the heat from the side adjacent to the primary winding 1 and the secondary winding 3, thereby increasing the power density of the transformer. The winding arrangement presents the form of primary winding 2-secondary winding 3-primary winding 2, realizing a sandwich structure, reducing leakage inductance and winding loss.

[0044] Thermally conductive potting compound with high thermal conductivity is used to fill the gaps between the primary winding 1, secondary winding 3, EE-type magnetic core, and heat dissipation frame 11. The heat on the side adjacent to the primary winding 1 and secondary winding 3 is carried away, thereby improving the power density of the transformer.

[0045] like Figure 2 As shown, when the secondary winding has 1 turn and the secondary winding 3 is wound around the central post of the EE-type magnetic core, the primary winding 2 has the following four winding structures: 1. When the primary winding 2 is wound on the center column of the EE type magnetic core, the number of turns wound on the primary winding 2 is the total number of turns on the primary side of the transformer, thus realizing an integer number of turns on the primary side of the transformer. 2. When the primary winding 2 is wound around the side post of the EE type magnetic core, if the primary winding 2 on both sides is connected in parallel, fractional turns are achieved, that is, the total number of turns of the primary winding of the transformer is equal to half of the number of turns of a single primary winding 2; if the primary winding 2 on both sides is connected in series, the total number of turns of the primary winding of the transformer is equal to the number of turns of a single primary winding 2. 3. When the primary winding 2 is wound on the middle column and the side column of the EE type magnetic core respectively, forming one middle column winding and two side column windings, if the middle column winding and the two side column windings are connected in series and the two side column windings are connected in parallel, a large fraction of turns is achieved, and the total number of turns on the primary side of the transformer is equal to the sum of the middle column winding and half of the single-sided side column winding. IV. When the primary winding 2 is wound around the four straight segments of the two magnetic cores 1 respectively, four side column windings are formed. In order to facilitate the expression of the connection relationship, the two side column windings corresponding to each of the two magnetic cores 1 are given different names. The two side column windings of one magnetic core 1 are called side column winding A and side column winding B respectively, and the two side column windings of the other magnetic core 1 are called side column winding C and side column winding D respectively. If the four sets of side-end windings A, B, C, and D are connected in parallel, the total number of turns on the primary side of the transformer is equal to half the number of turns of one set of side-end windings. If the A-side winding of one magnetic core 1 is connected in parallel with the C-side column winding or the D-side column winding of another magnetic core 1, or the B-side winding of one magnetic core 1 is connected in parallel with the C-side column winding or the D-side column winding of another magnetic core 1, wherein the A-side column winding and the B-side column winding are connected in series, and the C-side column winding and the D-side column winding are connected in series, then the total number of turns on the primary side of the transformer is equal to the number of turns of one set of column windings. If the four sets of side-terminal windings A, B, C, and D are connected in series, then the total number of turns on the primary side of the transformer is equal to the sum of the number of turns in the two sets of side-terminal windings.

[0046] By using different winding methods and series-parallel combinations, different variations of the transformer can be achieved. This is equivalent to having multiple combinations on the primary side of a transformer to adapt to different voltage level input requirements.

[0047] Specifically, such as Figures 3-4As shown, adjacent U-shaped copper blocks 35 are arranged with opposite openings. Four first conductive plates 36 are arranged on the upper and lower sides of the EE-type magnetic core. All U-shaped copper blocks 35 with openings facing the same direction have their arms on the same side connected to the same first conductive plate 36, thus forming two secondary windings 31 and 32 with the same structure but opposite directions. This ensures that the leakage inductance of the primary winding 1 to the secondary windings 31 and 32 is consistent. To increase the current-carrying area, the primary secondary winding 31 and 32 can be connected in parallel, compared to... Figure 1 While a single set of secondary windings 3 can withstand small currents, the arrangement of two completely symmetrical secondary windings 3 with equal distances can withstand larger currents.

[0048] Specifically, such as Figures 5-6 As shown, the outer end of a first conductive plate 36 at the upper left of the first secondary winding 31 serves as the head 311 of the first secondary winding, and the outer end of a first conductive plate 36 at the upper right of the first secondary winding 31 serves as the tail 312 of the first secondary winding.

[0049] The outer end of a first conductive plate 36 at the lower left of the second secondary winding 32, corresponding to the lower part of the head 311 of the first secondary winding 31, serves as the tail 321 of the second secondary winding. The outer end of a first conductive plate 36 at the lower right of the second secondary winding 32, corresponding to the lower part of the tail 312 of the first secondary winding, serves as the head 322 of the second secondary winding.

[0050] When the tail 312 of the first secondary winding and the head 322 of the second secondary winding are short-circuited, the tail 312 of the first secondary winding and the head 322 of the second secondary winding serve as center taps, and are led out to the negative terminal through the third conductive plate 8 between the tail 312 of the first secondary winding and the head 322 of the second secondary winding, thereby forming a full-wave rectified 1-turn + 1-turn transformer.

[0051] Furthermore, such as Figures 7-8 As shown, in order to achieve the switching between high, medium and low voltage, a protruding plate 6 is provided on the outer wall of the horizontal part of the U-shaped copper block 35, so that the protruding plates 6 corresponding to all U-shaped copper blocks 35 with the opening facing upward are connected to the same second conductive plate 7, thereby forming two secondary windings 33 and 34 with the same structure but opposite directions.

[0052] The second heat sink 4 is provided on both sides of the two sub-cores 1, and the upper and lower first conductive plates 36 on the same side of the corresponding EE type core are connected to the upper and lower sides of the same second heat sink 4. This allows the primary winding 1 and the adjacent sides of the third secondary winding 33 and the fourth secondary winding 34 to carry away the temperature outside the primary winding 1 through the third secondary winding 33 and the fourth secondary winding 34. At the same time, the second heat sink 4 can also carry away the heat of the two outer side column windings, further improving the power density of the transformer.

[0053] Furthermore, such as Figures 9-10 As shown, the symmetrical plane of the two arms of the U-shaped copper block 35 is used as the dividing plane. The dividing plane divides the third secondary winding 33 into two parts, left and right. The part on the left side of the dividing plane is called the third-1 secondary winding 331, and the part on the right side of the dividing plane is called the third-2 secondary winding 332.

[0054] The dividing plane divides the IV secondary winding 34 into two parts, the left part of the dividing plane is called the IV-1 secondary winding 341, and the right part of the dividing plane is called the IV-2 secondary winding 342.

[0055] Specifically, such as Figure 9 As shown, the outer end of a first conductive plate 36 located to the upper left of the U-shaped copper block 35 with the opening facing upward serves as the head 3311 of the III-1 secondary winding; the connection point between one end of the protruding plate 6 and the second conductive plate 7 located below the U-shaped copper block 35 with the opening facing upward serves as the tail 3312 of the III-1 secondary winding; the connection point between the other end of the protruding plate 6 and the second conductive plate 7 located below the U-shaped copper block 35 with the opening facing upward serves as the head 3321 of the III-2 secondary winding; and the outer end of a first conductive plate 36 located to the upper right of the U-shaped copper block 35 with the opening facing upward serves as the tail 3322 of the III-2 secondary winding.

[0056] like Figure 10 As shown, the outer end of a first conductive plate 36 located to the lower left of the U-shaped copper block 35 with the opening facing downwards, and corresponding to the lower part of the head 3311 of the III-1 secondary winding, serves as the tail 3411 of the IV-1 secondary winding. The connection between the second conductive plate 7 located at the upper end of the U-shaped copper block 35 with the opening facing downwards and one end of the convex plate 6 located at the horizontal part of the U-shaped copper block 35 with the opening facing downwards serves as the head 3412 of the IV-1 secondary winding. The connection between the second conductive plate 7 located at the upper end of the U-shaped copper block 35 with the opening facing downwards and the other end of the convex plate 6 located at the horizontal part of the U-shaped copper block 35 with the opening facing downwards serves as the tail 3421 of the IV-2 secondary winding. The outer end of a first conductive plate 36 located to the lower right of the U-shaped copper block 35 with the opening facing downwards, and corresponding to the lower part of the tail 3322 of the III-2 secondary winding, serves as the head 3422 of the IV-2 secondary winding.

[0057] like Figure 14 As shown, the head 3311 of the secondary winding III-1, the tail 3312 of the secondary winding III-1, the head 3412 of the secondary winding IV-1, and the tail 3411 of the secondary winding IV-1 are connected in sequence, and the head 3412 of the secondary winding IV-1 and the tail 3312 of the secondary winding III-1 are center taps, thus forming a full-wave rectified 0.5-turn + 0.5-turn transformer.

[0058] Furthermore, such as Figures 12-16As shown, to achieve the switching between a full-wave rectifier transformer and a full-bridge rectifier transformer, a third conductive plate 8 can be installed on the outer side of one of the two magnetic cores 1, corresponding to the tail 312 of the first secondary winding and the head 322 of the second secondary winding. When the tail 312 of the first secondary winding and the head 322 of the second secondary winding are connected by the third conductive plate 8, the third conductive plate 8 is led out as the negative terminal. At this time, the transformer is a full-wave rectifier transformer, forming a... Figures 12-14 Full-wave rectifier topology; when the third conductive plate 8 serves as a short-circuit between the tail 312 of the I secondary winding and the head 322 of the II secondary winding, the transformer is as follows: Figures 16-18 The transformer in the full-bridge rectifier circuit shown.

[0059] Furthermore, the third conductive plate 8 can be replaced by the second heat sink 4.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to be the only or limiting of the invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. A high-frequency conversion transformer, characterized in that, include: The magnetic core (1) is provided in two parallel sets, both of which are ring-shaped and include two parallel straight sections and a connecting section connecting the two ends of the straight sections; Primary winding (2) is wound on magnetic core (1); The secondary winding (3) includes U-shaped copper blocks (35) arranged in an array along the length of the straight section of the magnetic core (1). The two arms of the U-shaped copper blocks (35) are respectively inserted into the annular hollow of the two secondary magnetic cores (1), and all the U-shaped copper blocks (35) are connected to the same first conductive plate (36) through the arms on the same side of the magnetic core (1).

2. The high-frequency transformer according to claim 1, characterized in that, The primary winding (2) is wound in one of the following ways: When a section is wound, the primary winding (2) is wound on the adjacent straight section of the two magnetic cores (1); When two sections are wound, the primary winding (2) is wound on the straight sections outside the two magnetic cores (1); When winding three segments, the primary winding (2) is wound around the straight segments outside the two magnetic cores (1) and the adjacent straight segments of the two magnetic cores (1); When winding four segments, the primary winding (2) is wound around the four straight segments of the two magnetic cores (1).

3. The high-frequency transformer according to claim 1, characterized in that, A heat dissipation frame (11) is provided between two adjacent magnetic cores (1). The cross-section of the heat dissipation frame (11) is U-shaped. The two heat dissipation frames (11) on the same magnetic core (1) are arranged with their openings facing each other. The primary winding (2) is wrapped around the heat dissipation frame (11). One of the support arms of the heat dissipation frame (11) is provided with an L-shaped support plate (12). One end of the vertical part of the support plate (12) is connected to the corresponding support arm of the heat dissipation frame (11). The outer side of the horizontal part of the support plate (12) is connected to the first heat sink (5).

4. The high-frequency transformer according to claim 3, characterized in that, Thermally conductive potting compound is used to fill the gaps between the primary winding (2), secondary winding (3), magnetic core (1), and heat dissipation frame (11).

5. The high-frequency transformer according to claim 1, characterized in that, The magnetic core (1) has four first conductive plates (36) on its upper and lower sides. The opening directions of two adjacent U-shaped copper blocks (35) are opposite. The two first conductive plates (36) on the upper side and the U-shaped copper blocks (35) connected to them form the first secondary winding (31). The two first conductive plates (36) on the lower side and the U-shaped copper blocks (35) connected to them form the second secondary winding (32).

6. The high-frequency transformer according to claim 5, characterized in that, The outer end of one of the first conductive plates (36) of the first secondary winding (31) serves as the head (311) of the first secondary winding. The outer end of the other first conductive plate (36) of the first secondary winding (31) serves as the tail (312) of the first secondary winding. The end of one of the first conductive plates (36) of the second secondary winding (32) below the head (311) of the first secondary winding serves as the tail (321) of the second secondary winding. The end of the other first conductive plate (36) of the second secondary winding (32) below the tail (312) of the first secondary winding serves as the head (322) of the second secondary winding. When the tail (312) of the first secondary winding and the head (322) of the second secondary winding are short-circuited, the tail (312) of the first secondary winding and the head (322) of the second secondary winding serve as the center tap.

7. The high-frequency transformer according to claim 5, characterized in that, The outer wall of the transverse portion of the U-shaped copper block (35) of the first secondary winding (31) and the second secondary winding (32) is provided with a protruding plate (6). The protruding plates (6) of all the U-shaped copper blocks (35) of the first secondary winding (31) are connected to a second conductive plate (7) to form the third secondary winding (33). The protruding plates (6) of all the U-shaped copper blocks (35) of the second secondary winding (32) are connected to another second conductive plate (7) to form the fourth secondary winding (34).

8. The high-frequency transformer according to claim 7, characterized in that, Using the symmetrical plane of the two arms of the U-shaped copper block (35) as the dividing plane, the third secondary winding (33) and the fourth secondary winding (34) are each divided into two parts, namely the third-1 secondary winding (331) and the third-2 secondary winding (332); the fourth-1 secondary winding (341) and the fourth-2 secondary winding (342), the third-1 secondary winding (331) and the fourth-1 secondary winding (341) are connected, the third-2 secondary winding (332) and the fourth-2 secondary winding (342) are connected, and the connection structure formed by the third-1 secondary winding (331) and the fourth-1 secondary winding (341) and the connection structure formed by the third-2 secondary winding (332) and the fourth-2 secondary winding (342) are symmetrical.

9. The high-frequency transformer according to claim 8, characterized in that, The outer end of the first conductive plate (36) located on the upper left side of the dividing surface serves as the head (3311) of the III-1 secondary winding. The connection point between the second conductive plate (7) at the lower end and one end of the corresponding convex plate (6) serves as the tail (3312) of the III-1 secondary winding. The connection point between the second conductive plate (7) at the lower end and the other end of the corresponding convex plate (6) serves as the head (3221) of the III-2 secondary winding. The outer end of the other first conductive plate (36) located on the upper right side of the dividing surface serves as the tail (3322) of the III-2 secondary winding. The outer end of the first conductive plate (36) located on the lower left side of the dividing surface serves as the tail (3411) of the IV-1 secondary winding. The second conductive plate (7) located at the upper end... One end of the corresponding convex plate (6) serves as the head (3412) of the IV-1 secondary winding. The second conductive plate (7) located at the upper end serves as the tail (3421) of the IV-2 secondary winding. The outer end of the other first conductive plate (36) located on the lower right side of the dividing surface serves as the head (3422) of the IV-2 secondary winding. The tail (3411) of the IV-1 secondary winding, the head (3412) of the IV-1 secondary winding, the tail (3312) of the III-1 secondary winding, and the head (3311) of the III-1 secondary winding are connected in sequence. The head (3412) of the IV-1 secondary winding and the tail (3312) of the III-1 secondary winding are center taps.

10. The high-frequency transformer according to claim 6, characterized in that, One of the racetrack-shaped magnetic cores (1) has a third conductive plate (8) on its outer side. When the transformer rectification is full-wave rectification, the tail (312) of the I secondary winding and the head (322) of the II secondary winding are connected to the third conductive plate (8). The third conductive plate (8) is the negative pole. When the transformer rectification is bridge type, the third conductive plate (8) is the inter-turn shorting bar.

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