High-frequency transformer with low-voltage and high-current output

Abstract

The invention discloses a high-frequency transformer with low-voltage and high-current output. The high-frequency transformer comprises an inner copper bar sleeve, an outer copper bar sleeve and a high-voltage wire bag which are coaxially arranged inside and outside, a cavity extending in the axial lead direction in the inner copper bar sleeve is used for accommodating a transformer magnetic core; the outer copper bar sleeve is arranged on the inner copper bar sleeve in a sleeving manner in the axial lead direction; the high-voltage wire is wrapped between the inner copper bar sleeve and the outer copper bar sleeve and is insulated and isolated from the inner copper bar sleeve and the outer copper bar sleeve respectively; the inner copper bar sleeve and the outer copper bar sleeve are both secondary side coils of the high-frequency transformer. According to the invention, the high-voltage wire is wrapped between the two secondary coils of the inner copper bar sleeve and the outer copper bar sleeve, on one hand, the primary and secondary coils are well coupled, the reduction of the utilization rate of the wire due to the proximity effect under high frequency is reduced, and the power conversion efficiency is improved; on the other hand, the high-frequency high-voltage wire is wrapped by the inner and outer copper bar sleeves, so that radiation interference of high-frequency switch noise to the outside is effectively reduced; in addition, the inner copper bar sleeve and the outer copper bar sleeve have good thermal conductivity, heat dissipation performance and excellent through-current capability.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a high-frequency transformer with low voltage and high current output. Background Art

[0002] As one of the main components of the switching power supply, the high-frequency transformer plays the role of electrical isolation, voltage conversion and energy transmission. Its design scheme has a crucial impact on the power supply output quality, reliability, conversion efficiency and the degree of external electromagnetic interference. As the output power of the power supply increases, the larger the output current, the more difficult the design of the transformer becomes. On the one hand, due to the high-frequency skin effect and the proximity effect of the winding, the utilization rate of the current carrying capacity of the winding wire is reduced, and the heating of the wire package seriously affects the reliability and reduces the conversion efficiency of the transformer. On the other hand, the electromagnetic interference generated to the outside also increases significantly with the increase of current. In the commonly used transformer design in the prior art, in order to ensure that the temperature is not too high when the output current is increased, it may be necessary to use more multi-strand copper wire windings in parallel and then connect them to the output electrode. This scheme increases the difficulty of connecting the winding and the electrode, and the winding process is complicated, and it is difficult to achieve good electromagnetic shielding. Due to the limitation of the size of the winding space, the output current capacity is also greatly limited. Multiple windings are squeezed together for heat dissipation. When the load increases, the temperature is often difficult to control, the primary and secondary coupling is poor, and the loss is also large. Summary of the invention

[0003] In view of the defects existing in the prior art, the purpose of the present invention is to provide a high-frequency transformer with low voltage and high current output, in which the primary high-voltage wire package is arranged between the two secondary coils of the inner copper busbar sleeve and the outer copper busbar sleeve, and the high-frequency high-voltage wire package is fully wrapped by the inner and outer copper busbar sleeves as two secondary coils. The transformer has a simple and compact structure, good coupling between the primary and secondary coils, high power conversion efficiency, and good heat dissipation performance. Therefore, it is suitable for wide promotion.

[0004] The present invention proposes a high-frequency transformer with low-voltage and high-current output, comprising: an inner copper bar sleeve, an outer copper bar sleeve and a high-voltage wire package which are coaxially arranged inside and outside; the inner copper bar sleeve has a cavity extending in the direction of the axial centerline, which is used to accommodate the transformer core; the outer copper bar sleeve is sleeved on the inner copper bar sleeve along the axial centerline; the high-voltage wire package is arranged between the inner copper bar sleeve and the outer copper bar sleeve, and is insulated and isolated from the inner copper bar sleeve and the outer copper bar sleeve respectively, wherein the inner copper bar sleeve and the outer copper bar sleeve are both secondary coils of the high-frequency transformer.

[0005] As a further definition of the present invention, the inner copper bar sleeve comprises: the first to fourth inner copper plates connected in sequence, the first and third inner copper plates, and the second and fourth inner copper plates are arranged parallel to each other; the outer copper bar sleeve comprises: the first to fourth outer copper plates connected in sequence, the first and third outer copper plates, and the second and fourth outer copper plates are arranged parallel to each other; wherein the inner copper bar sleeve is located inside the outer copper bar sleeve, and its longitudinal section forms a U-shaped structure.

[0006] As a further limitation of the present invention, the lower edge of the fourth inner copper plate of the inner copper bar sleeve is bent 90 degrees and extended toward the second inner copper plate to form an inner tapped copper bar; the lower edge of the first outer copper plate of the outer copper bar sleeve is bent 90 degrees and extended away from the third outer copper plate to form an outer tapped copper bar; the inner tapped copper bar and the outer tapped copper bar are both center tap lead-out terminals of the secondary coil.

[0007] As a further limitation of the present invention, the cross-section of the inner tap copper busbar is approximately U-shaped, and the U-shaped opening is toward the extension direction of the outer tap copper busbar of the outer copper busbar sleeve; the two ends of the U-shaped bottom edge extend outward respectively and extend out of the two ends of the inner copper busbar sleeve, and the width dimension of the extension of the bottom edge is basically the same as the width dimension of the outer tap copper busbar of the outer copper busbar sleeve; the distal edges of the two side edges of the U-shape are basically flush with the outer side edges of the outer tap copper busbar of the outer copper busbar sleeve; wherein, the through holes on the two side edges of the U-shape of the inner tap copper busbar and the screw holes on the two ends of the outer tap copper busbar of the outer copper busbar sleeve realize the electrical connection between the inner tap copper busbar and the outer tap copper busbar through bolts.

[0008] As a further definition of the present invention, one end of the first inner copper plate of the inner copper bar sleeve is parallel to the axial centerline direction of the inner copper bar sleeve and extends out of the first busbar on the outside of the inner copper bar sleeve; the first busbar includes: a first horizontal section extending outward along one end of the first inner copper plate; a first vertical section extending along the outside of the first horizontal section and bending downward 90 degrees to form; and a second horizontal section extending outward by bending 90 degrees outward from the lower end of the first vertical section, and the second horizontal section is basically parallel to the first horizontal section; one end of the fourth outer copper plate of the outer copper bar sleeve is parallel to the outer copper bar A second busbar extends outward from the outer copper busbar sleeve in the direction of the axial centerline of the sleeve; the second busbar comprises: a third horizontal section extending outward along one end of the fourth outer copper plate; a second vertical section extending downward by 90 degrees along the outer side of the third horizontal section; and a fourth horizontal section extending outward by 90 degrees along the lower end of the second vertical section, and the fourth horizontal section is substantially parallel to the third horizontal section; wherein the second horizontal section of the first busbar forms the output end of the secondary coil of the high-frequency transformer, and the fourth horizontal section of the second busbar forms the other output end of the secondary coil of the high-frequency transformer.

[0009] As a further limitation of the present invention, the copper plate extensions extending outwards at both ends of the third inner copper plate of the inner copper busbar sleeve are used to install a temperature sensing switch.

[0010] As a further limitation of the present invention, it also includes: a copper bar bracket, which has a "X"-shaped structure and is electrically connected to the tapped copper bar of the secondary coil of the high-frequency transformer, and is used to install the magnetic core of the output inductor, including a first vertical copper bar, a second vertical copper bar, a first horizontal copper bar and a second horizontal copper bar; wherein, the lower end of the first vertical copper bar is connected to the outer side of the outer tapped copper plate of the outer copper bar sleeve, the upper end of the first vertical copper bar is connected to one end of the first horizontal copper bar, the other end of the first horizontal copper bar is connected to the upper end of the second vertical copper bar, the lower end of the second vertical copper bar is connected to one end of the second horizontal copper bar, and the other end of the second horizontal copper bar is connected to the positive output terminal.

[0011] As a further limitation of the present invention, the first vertical copper bar, the second vertical copper bar and the first horizontal copper bar have the same width, and the first vertical copper bar and the second vertical copper bar have the same height.

[0012] As a further limitation of the present invention, the first to fourth outer copper plates of the outer copper bar sleeve, the outer tap copper plate, the second busbar and the first vertical copper bar, the second vertical copper bar, the first horizontal copper bar and the second horizontal copper bar of the copper bar bracket are integrally formed.

[0013] As a further limitation of the present invention, the first to fourth inner copper plates of the inner copper busbar sleeve, the inner tap copper busbar and the first busbar are integrally formed.

[0014] The technical effects of the high-frequency transformer with low voltage and high current output provided by the present invention are as follows:

[0015] 1. The primary high-voltage wire package is set between the two secondary coils of the inner copper busbar sleeve and the outer copper busbar sleeve. On the one hand, it realizes good coupling between the primary and secondary windings, reduces the reduction in the utilization rate of the wire due to the proximity effect under high-frequency conditions, and improves the power conversion efficiency; on the other hand, because the high-frequency wire package is fully wrapped by the inner and outer copper busbar sleeve coils, the external radiation interference of the high-frequency switching noise is effectively reduced.

[0016] 2. Using inner and outer copper busbars as secondary coils is conducive to the rapid outward conduction of heat generated by the high-frequency transformer, thus achieving good heat dissipation.

[0017] 3. The inner copper bar sleeve is used as a secondary coil (output winding) of the high-frequency transformer, and it also replaces the role of the traditional transformer coil frame, making it convenient to wrap the high-voltage winding wire on the surface of the inner copper bar sleeve.

[0018] 4. The outer copper busbar sleeve and copper busbar bracket adopt an integrated structure. The transformer core and the output inductor core are installed on the integrated outer copper busbar sleeve, realizing the integrated design of the transformer and the output filter inductor, reducing the assembly and connection process of the output high current busbar, and reducing the heat loss caused by the contact resistance caused by the additional connection endpoints. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is one of the structural diagrams of Embodiment 1 of the present invention;

[0021] Figure 2 This is the second structural diagram of Embodiment 1 of the present invention;

[0022] Figure 3 This is the third structural diagram of Embodiment 1 of the present invention;

[0023] Figure 4 is a schematic diagram of the decomposed structure of Embodiment 1 of the present invention;

[0024] Figure 5 It is a schematic structural diagram of an inner copper busbar sleeve and a high-voltage wire package in Embodiment 1 of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the inner copper busbar sleeve of embodiment 1 of the present invention;

[0026] Figure 7 is a schematic structural diagram of the inner copper busbar sleeve from another perspective of Example 1 of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the outer copper busbar sleeve of Example 1 of the present invention;

[0028] Fig. 9 is a schematic structural diagram of the outer copper busbar sleeve from another perspective of Example 1 of the present invention;

[0029] Fig.10 The circuit diagram of Embodiment 1 of the present invention;

[0030] Fig.11 is a schematic structural diagram of Embodiment 2 of the present invention;

[0031] Fig.12 It is a structural diagram of embodiment 3 of the present invention.

[0032] Reference numerals:

[0033] Inner copper busbar sleeve 1; cavity 11; first inner copper plate 12; second inner copper plate 13; third inner copper plate 14; copper plate extension 14a; fourth inner copper plate 15; inner tap copper busbar 16; bottom edge 16a; side edge 16b; first busbar 17; first horizontal section 17a; first vertical section 17b; second horizontal section 17c;

[0034] External copper bar sleeve 2; first external copper plate 21; second external copper plate 22; third external copper plate 23; fourth external copper plate 24; external tap copper bar 25; second bus bar 26; third horizontal section 26a; second vertical section 26b; fourth horizontal section 26c; copper bar bracket 27; first vertical copper bar 27a; second vertical copper bar 27c; first horizontal copper bar 27c; second horizontal copper bar 27d;

[0035] Transformer core 3;

[0036] Inductor core 4;

[0037] High voltage wire package 5. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Fig.10As shown, the high-frequency transformer capable of low-voltage and high-current output provided in this embodiment comprises: an inner copper bar sleeve 1, an outer copper bar sleeve 2 and a high-voltage wire package 5 which are coaxially arranged inside and outside. Inside the inner copper bar sleeve 1, a cavity 11 with two ends opening is extended along the axis aa direction, and the cavity 11 is used to accommodate the transformer core 3, which is composed of two EE ferrite cores, and the inner copper bar sleeve 1 is arranged around the inner magnetic column of the EE ferrite core. The outer copper bar sleeve 2 is sleeved on the outer side of the inner copper bar sleeve 1 along the axis aa direction, and there is a gap between the inner wall of the outer copper bar sleeve 2 and the outer wall of the inner copper bar sleeve 1, and the high-voltage wire package 5 is arranged in the gap between the inner copper bar sleeve 1 and the outer copper bar sleeve 2, and the high-voltage wire package 5 is insulated and isolated from the inner copper bar sleeve 1 and the outer copper bar sleeve 2 respectively; wherein, the inner copper bar sleeve 1 and the outer copper bar sleeve 2 are both made of anti-oxidation treated copper plates, which are respectively used as the two secondary coils (secondary windings) of the high-frequency transformer to form a full-wave rectifier output side.

[0041] The high-voltage wire package 5 is wound on the inner copper busbar sleeve 1, and the inner copper busbar sleeve 1 and the outer copper busbar sleeve 2 are respectively arranged inside and outside the high-voltage wire package 5. Wrapping the high-voltage wire package 5 is beneficial to the good coupling of the primary and secondary windings, reducing the reduced utilization rate of the wire due to the proximity effect under high-frequency conditions, and improving the power conversion efficiency. On the other hand, since the high-frequency high-voltage wire package 5 is wrapped by the inner copper busbar sleeve 1 and the outer copper busbar sleeve 2, the external radiation interference of the high-frequency switching noise is effectively reduced. The inner copper busbar sleeve 1 and the outer copper busbar sleeve 2 are direct currents of the output secondary winding after rectification by the rectifier diode, with less external interference and shielding effect on the internal high-frequency signal.

[0042] like Figure 6 and Figure 7 It is a structural schematic diagram of an inner copper bar sleeve 1, and the inner copper bar sleeve 1 includes: the first to fourth inner copper plates connected in sequence, and the first and third inner copper plates, the second and fourth inner copper plates are arranged parallel to each other, and the cross-sections of the first to fourth inner copper plates are approximately in the shape of a square. Specifically, the first inner copper plate 12 is located at the bottom of the inner copper bar sleeve 1, and one side of the first inner copper plate 12 is bent upward at 90 degrees and extended to form the second inner copper plate 13; the upper side of the second inner copper plate 13 is bent inward at 90 degrees and extended to form the third inner copper plate 14, and the third inner copper plate 14 is parallel to the first inner copper plate 12; the side of the third inner copper plate 14 away from the second inner copper plate 13 is bent downward at 90 degrees and extended to form the fourth inner copper plate 15, and the fourth inner copper plate 15 is parallel to the second inner copper plate 13; therefore, the first inner copper plate 12, the second inner copper plate 13, the third inner copper plate 14 and the fourth inner copper plate 15 are surrounded by a square tube structure with two ends open.

[0043] At the lower edge of the fourth inner copper plate 15 of the inner copper bar sleeve 1, an inner tap copper bar 16 is bent 90 degrees and extended toward the second inner copper plate 13 to form a central tap lead-out end of the secondary coil of the inner copper bar sleeve 1. Specifically, the cross section of the inner tap copper bar 16 is approximately U-shaped, and the two ends of the bottom edge 16a of the U shape extend outwards respectively and extend out of the two ends of the inner copper bar sleeve 1. The two side edges 16b at the two ends of the bottom edge 16a of the U shape are located outside the two ends of the inner copper bar sleeve 1, and a plurality of through holes are distributed on the two side edges 16b.

[0044] like Figure 6 As shown, the two ends of the third inner copper plate 14 of the inner copper busbar sleeve 1 have copper plate extensions 14a extending outwards respectively. A temperature sensing switch can be installed on the copper plate extensions 14a for temperature rise protection of the transformer. The temperature sensing switch is a common technology and will not be described in detail.

[0045] like Figure 7 As shown, one end of the first inner copper plate 13 of the inner copper bar sleeve 1 is parallel to the axial centerline direction of the inner copper bar sleeve 1, and a first busbar 17 is provided on the outside of the inner copper bar sleeve 1. Specifically, the first busbar 17 includes: a first horizontal section 17a extending outwardly along one end of the first inner copper plate 12, a first vertical section 17b extending along the outer side of the first horizontal section 17a and bending downward 90 degrees, and a second horizontal section 17c extending outwardly along the lower end of the first vertical section 17b, bending outward 90 degrees, and extending outward, and the second horizontal section 17c is substantially parallel to the first horizontal section 17a, and a plurality of external connection holes are provided on the second horizontal section 17c, and the second horizontal section 17c forms the output end of the secondary coil of the high-frequency transformer.

[0046] like Figure 8 and Fig. 9 As shown, the outer copper bar sleeve 2 includes: the first to fourth outer copper plates connected in sequence, the first and third outer copper plates, the second and fourth outer copper plates are arranged parallel to each other, and the cross-sections of the first to fourth outer copper plates are approximately in the shape of a square. Specifically, the first outer copper plate 21 of the outer copper bar sleeve 2 is arranged parallel to the second inner copper plate 13 of the inner copper bar sleeve 1, and the upper side of the first outer copper plate 21 is bent 90 degrees and extended toward the inner side of the outer copper bar sleeve 2 to form the second outer copper plate 22; the side of the second outer copper plate 22 is bent 90 degrees downward away from the first outer copper plate 21 and extended to form the third outer copper plate 23; the lower side of the third outer copper plate 23 is bent 90 degrees and extended toward the first outer copper plate 21 to form the fourth outer copper plate 24. Thus, the first to fourth outer copper plates are bent multiple times to form a square tube structure with two ends open.

[0047] From the lower side of the first outer copper plate 21 of the outer copper bar sleeve 2, away from the direction of the third outer copper plate 23, it is bent outward 90 degrees and extended to form an outer tap copper bar 25, which is used for the outer copper bar sleeve 2 as the center tap lead-out end of the secondary coil. A plurality of openings are respectively provided at both ends of the outer tap copper bar 25, which correspond to the through holes of the U-shaped side 16b of the inner tap copper bar 16 on the inner copper bar sleeve 1, and the outer tap copper bar 25 and the inner tap copper bar 16 are electrically connected by bolts.

[0048] like Figure 8 As shown, along one end of the fourth outer copper plate 24 of the outer copper bar sleeve 2, parallel to the axis aa direction of the outer copper bar sleeve 2, a second busbar 26 extending outward from the outer copper bar sleeve 2 forms another output end of the secondary coil of the high-frequency transformer. Specifically, the second busbar 26 includes: a third horizontal section 26a extending outward along one end of the fourth outer copper plate 24, a second vertical section 26b extending downward by 90 degrees along the outer side of the third horizontal section 26a; and a fourth horizontal section 26c extending outward by 90 degrees along the lower end of the second vertical section 26b, and the fourth horizontal section 26c is substantially parallel to the third horizontal section 26a, and a plurality of connecting screw holes are provided on the fourth horizontal section 26c.

[0049] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the U-shaped opening of the inner tap copper bar 16 of the inner copper bar sleeve 1 faces the extension direction of the outer tap copper bar 25 of the outer copper bar sleeve 2; the two ends of the U-shaped bottom edge 16a extend outward respectively and extend out of the two ends of the inner copper bar sleeve 1, and the extension width of the bottom edge 16a is basically the same as the width of the outer tap copper bar 25 of the outer copper bar sleeve 2; the distal edges of the two side edges 16b of the U-shape are basically flush with the outer side edges of the outer tap copper bar 25 of the outer copper bar sleeve 2; wherein, the inner copper bar sleeve 1 is located in the outer copper bar sleeve 2, and its longitudinal section forms a U-shaped structure.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 8 , Fig. 9As shown, the high-frequency transformer also includes: a copper bar support 27, which is in a "X" shape and is integrally formed with the outer tap copper bar 25 of the outer copper bar sleeve 2 of the high-frequency transformer. Specifically, the copper bar support 27 includes a first vertical copper bar 27a, a second vertical copper bar 27b, a first horizontal copper bar 27c and a second horizontal copper bar 27d. Among them, the lower end of the first vertical copper bar 27a is connected to the outer side of the outer tap copper plate 25 of the outer copper bar sleeve 2, the upper end of the first vertical copper bar 27a is connected to one end of the first horizontal copper bar 27c, the other end of the first horizontal copper bar 27c is connected to the upper end of the second vertical copper bar 27b, the lower end of the second vertical copper bar 27b is connected to one end of the second horizontal copper bar 27d, and the other end of the second horizontal copper bar 27d is connected to the positive output end of the high-frequency transformer. The first vertical copper bar 27a, the second vertical copper bar 27b and the first horizontal copper bar 27c have the same width, and the first vertical copper bar 27a and the second vertical copper bar 27b have the same height. The inductor core 4 is sleeved on the first vertical copper bar 27a.

[0051] It should be noted that, in this embodiment, the first outer copper plate 21, the second outer copper plate 22, the third outer copper plate 23 and the fourth outer copper plate 24, the outer tap copper plate 25 and the second busbar 26 of the outer copper bar sleeve 2, and the first vertical copper bar 27a, the second vertical copper bar 27b, the first horizontal copper bar 27c and the second horizontal copper bar 27d of the copper bar bracket 27 are integrally bent. The first to fourth inner copper plates of the inner copper bar sleeve 1, the inner tap copper bar 16 and the first busbar 17 are integrally bent.

[0052] Example 2

[0053] like Fig.11 As shown, the high-frequency transformer capable of low-voltage and high-current output provided in this embodiment is different from the first embodiment in that an inductor core 4 is installed on the first vertical copper bar 27a of the copper bar bracket 27, and another inductor core 4 is installed on the second vertical copper bar 27b. The output filter inductor can realize the assembly of multiple inductor cores on the copper bar bracket 27 on the outer copper bar sleeve 2.

[0054] Example 3

[0055] like Fig.12 As shown, the high-frequency transformer capable of low-voltage and high-current output provided in this embodiment is different from the first embodiment in that an inductor core 4 is installed on the copper bus bracket 27, and the inductor core 4 is composed of an EE ferrite core.

[0056] The output filter inductor of the present invention can realize the assembly of various magnetic cores on the copper busbar bracket 27 of the outer copper busbar sleeve 2, so that from an economic point of view, a pair of EE ferrite cores or a group of flat ring amorphous cores, or two groups of amorphous cores can be adopted, so that one structural design can flexibly and diversely realize the requirements of different core assembly forms at different power outputs.

[0057] The present invention can realize overall modular assembly of a high-frequency transformer and an output filter inductor on the same structure, thereby reducing the bridging process between different devices (transformer and output inductor) and the inevitable contact resistance at the connection point during connection, which causes large heat loss when a large current passes through.

[0058] In the present invention, unless otherwise specified, the directional words contained in the terms such as "up, down, left, right, front, back, inside, outside, vertical, horizontal" only represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, number series nouns such as "first", "second" and "third" do not represent specific quantities and orders, but are merely used to distinguish names. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or equipment.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-frequency transformer with low voltage and high current output, characterized in that: include: An inner copper busbar sleeve (1), an outer copper busbar sleeve (2) and a high-voltage wire package (5) are coaxially arranged inside and outside; The inner copper busbar sleeve (1) has a cavity (11) extending in the direction of the axial centerline, which is used to accommodate the transformer magnetic core (3); The outer copper bar sleeve (2) is sleeved on the inner copper bar sleeve (1) along the axis direction; The high-voltage wire package (5) is arranged between the inner copper bar sleeve (1) and the outer copper bar sleeve (2), and is insulated and isolated from the inner copper bar sleeve (1) and the outer copper bar sleeve (2) respectively; Wherein, the inner copper bar sleeve (1) and the outer copper bar sleeve (2) are both secondary coils of a high-frequency transformer.

2. The high frequency transformer according to claim 1, characterized in that: The inner copper busbar sleeve (1) comprises: first to fourth inner copper plates connected in sequence, the first and third inner copper plates, and the second and fourth inner copper plates arranged parallel to each other; The outer copper busbar sleeve (2) comprises: first to fourth outer copper plates connected in sequence, the first and third outer copper plates, and the second and fourth outer copper plates are arranged parallel to each other; The inner copper busbar sleeve (1) is located inside the outer copper busbar sleeve (2), and its longitudinal section forms a U-shaped structure.

3. The high frequency transformer according to claim 2, characterized in that: The lower edge of the fourth inner copper plate (15) of the inner copper bar sleeve (1) is bent 90 degrees toward the second inner copper plate (13) and extended to form an inner tap copper bar (16); The lower edge of the first outer copper plate (21) of the outer copper bar sleeve (2) is bent 90 degrees away from the third outer copper plate (23) and extended to form an outer tap copper bar (25); The inner tap copper bar (16) and the outer tap copper bar (25) are both central tap lead-out ends of the secondary coil.

4. The high frequency transformer according to claim 3, characterized in that: The cross section of the inner tap copper bar (16) is approximately U-shaped, and the U-shaped opening faces the extension direction of the outer tap copper bar (25) of the outer copper bar sleeve (2); The two ends of the U-shaped bottom edge (16a) extend outwards respectively and extend out of the two ends of the inner copper bar sleeve (1), and the width dimension of the extended bottom edge (16a) is substantially the same as the width dimension of the outer tap copper bar (25) of the outer copper bar sleeve (2); The distal edges of the two side edges (16b) of the U-shape are respectively substantially flush with the outer edges of the outer tap copper bar (25) of the outer copper bar sleeve (2); The through holes on the two side edges (16b) of the U-shape of the inner tap copper bar (16) and the screw holes on the two ends of the outer tap copper bar (25) of the outer copper bar sleeve (2) are used to realize electrical connection between the inner tap copper bar (16) and the outer tap copper bar (25) through bolts.

5. The high frequency transformer according to claim 4, characterized in that: One end of the first inner copper plate (12) of the inner copper bar sleeve (1) is parallel to the axis of the inner copper bar sleeve (1) and extends out of the first bus bar (17) outside the inner copper bar sleeve (1); The first busbar (17) comprises: A first horizontal section (17a) extending outwardly along one end of the first inner copper plate (12); A first vertical section (17b) is formed by extending along the outer side of the first horizontal section (17a) and bending downward by 90 degrees; and a second horizontal section (17c) formed by bending outward at 90 degrees along the lower end of the first vertical section (17b) and extending outward, and the second horizontal section (17c) is substantially parallel to the first horizontal section (17a); One end of the fourth outer copper plate (24) of the outer copper bar sleeve (2) is parallel to the axis of the outer copper bar sleeve (2) and extends out of the second bus bar (26) outside the outer copper bar sleeve (2); The second busbar (26) comprises: a third horizontal section (26a) extending outwardly along one end of the fourth outer copper plate (24); A second vertical section (26b) extending downwardly by 90 degrees along the outer side of the third horizontal section (26a); and a fourth horizontal section (26c) extending outwardly at a 90-degree bend along the lower end of the second vertical section (26b), wherein the fourth horizontal section (26c) is substantially parallel to the third horizontal section (26a); The second horizontal section (17c) of the first busbar (17) forms the output end of the secondary coil of the high-frequency transformer, and the fourth horizontal section (26c) of the second busbar (26) forms the other output end of the secondary coil of the high-frequency transformer.

6. The high frequency transformer according to claim 5, characterized in that: The two ends of the third inner copper plate (14) of the inner copper busbar sleeve (1) respectively have copper plate extensions (14a) extending outwards for mounting a temperature sensing switch.

7. The high frequency transformer according to claim 6, characterized in that: Also includes: The copper bar bracket (27) is in a "X"-shaped structure, is electrically connected to the tapped copper bar of the secondary coil of the high-frequency transformer, and is used to install the magnetic core of the output inductor, and includes a first vertical copper bar (27a), a second vertical copper bar (27b), a first horizontal copper bar (27c), and a second horizontal copper bar (27d); The lower end of the first vertical copper bar (27a) is connected to the outer side of the outer tap copper plate (25) of the outer copper bar sleeve (2), the upper end of the first vertical copper bar (27a) is connected to one end of the first horizontal copper bar (27c), the other end of the first horizontal copper bar (27c) is connected to the upper end of the second vertical copper bar (27b), the lower end of the second vertical copper bar (27b) is connected to one end of the second horizontal copper bar (27d), and the other end of the second horizontal copper bar (27d) is connected to the positive output terminal.

8. The high frequency transformer according to claim 7, characterized in that: The first vertical copper bar (27a), the second vertical copper bar (27b) and the first horizontal copper bar (27c) have the same width, and the first vertical copper bar (27a) and the second vertical copper bar (27b) have the same height.

9. The high frequency transformer according to claim 8, characterized in that: The first to fourth outer copper plates of the outer copper bar sleeve (2), the outer tap copper plate (25), the second bus bar (26) and the first vertical copper bar (27a), the second vertical copper bar (27b), the first horizontal copper bar (27c) and the second horizontal copper bar (27d) of the copper bar bracket (27) are integrally formed.

10. The high frequency transformer according to claim 8, characterized in that: The first to fourth inner copper plates of the inner copper busbar sleeve (1), the inner tap copper busbar (16) and the first busbar (17) are integrally formed.

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