Laminated copper busbar and three-phase high-power inverter

Abstract

The embodiment of the present invention provides a laminated copper bar and a three-phase high-power inverter, wherein the laminated copper bar includes a busbar positive copper bar, a busbar negative copper bar, a U-phase output copper bar, a V-phase output copper bar, a W-phase output copper bar and six insulating plates fixed together by insulating fixings, and the busbar positive copper bar, the busbar negative copper bar, the U-phase output copper bar, the V-phase output copper bar and the W-phase output copper bar are respectively sandwiched between two adjacent insulating plates; the first side surface of the laminated copper bar has a first terminal group, a second terminal group and a third terminal group, and the second side surface of the laminated copper bar has a fourth terminal group, a fifth terminal group and a sixth terminal group. The embodiment of the present invention uses five layers of laminated copper bars to install six single-tube half-bridge arm high-power switch modules in two planes respectively, which greatly improves the power density of the inverter, so that it can be used in industries with strict space requirements.

Description

Technical Field

[0001] The invention relates to the field of inverters, and more specifically to a laminated copper busbar and a three-phase high-power inverter. Background Art

[0002] In a low-voltage, high-power megawatt inverter, the voltage on the DC bus is converted into UVW three-phase AC power through six semiconductor switches. Figure 1 shown.

[0003] In specific implementation, the inverter can be used as follows: Figure 2 The double-tube IGBT (Insulated Gate Bipolar Transistor) shown in the figure performs voltage conversion. In this inverter, each double-tube IGBT includes an upper bridge arm switch tube and a lower bridge arm switch tube, and is connected through the positive and negative layers of the busbar. However, since the power of a single double-tube IGBT is relatively small, the inverter using the double-tube IGBT and the positive and negative layers of the busbar copper busbar structure often requires multiple parallel connections to meet the power requirements, which makes the area of ​​the positive and negative layers of the busbar copper busbars larger and causes the power density of the inverter to be relatively small. For example, for a 1.2 MW inverter, the width of the cabinet is more than 800 mm, which limits its use in many industries with strict space requirements.

[0004] In addition, low-voltage high-power megawatt inverters can also use Figure 3 The single-tube half-bridge arm high-power IGBT shown in the figure performs voltage conversion. Each single-tube half-bridge arm high-power IGBT includes three parallel switch tubes and adopts a bus +, bus -, and output single-phase three-layer laminated copper busbar structure. However, in the inverter using this structure, multiple single-tube half-bridge arm high-power IGBTs are located on the same mounting surface, and there is also a problem of low power density. In a megawatt-level inverter, the cabinet occupies a large space. Summary of the invention

[0005] In order to solve the problem that the above-mentioned low-voltage high-power megawatt inverter has low power density and cannot be used in industries with strict space requirements, the embodiments of the present invention provide a laminated copper busbar and a three-phase high-power inverter.

[0006] The technical solution of the present invention to solve the above technical problems is to provide a laminated copper bar, comprising a busbar positive copper bar, a busbar negative copper bar, a U-phase output copper bar, a V-phase output copper bar, a W-phase output copper bar and six insulating plates fixed together by insulating fixings, and the busbar positive copper bar, the busbar negative copper bar, the U-phase output copper bar, the V-phase output copper bar and the W-phase output copper bar are respectively sandwiched between two adjacent insulating plates; the first side surface of the laminated copper bar has a first terminal group, a second terminal group and a third terminal group arranged along the length direction of the laminated copper bar and respectively used to connect the power unit module, and the second side surface of the laminated copper bar has a fourth terminal group, a fifth terminal group and a sixth terminal group arranged along the length direction of the laminated copper bar and respectively used to connect the power unit module.

[0007] Preferably, the first terminal group includes a first positive input terminal conductively connected to the busbar positive copper bar and a first U-phase output terminal conductively connected to the U-phase output copper bar;

[0008] The second terminal group includes a second positive input terminal conductively connected to the busbar positive copper bar and a first V-phase output terminal conductively connected to the V-phase output copper bar;

[0009] The third terminal group includes a third positive input terminal conductively connected to the busbar positive copper bar and a first W-phase output terminal conductively connected to the W-phase output copper bar;

[0010] The fourth terminal group includes a first negative input terminal conductively connected to the busbar negative copper bar and a second U-phase output terminal conductively connected to the U-phase output copper bar;

[0011] The fifth terminal group includes a second negative input terminal conductively connected to the busbar negative copper bar and a second V-phase output terminal conductively connected to the V-phase output copper bar;

[0012] The sixth terminal group includes a third negative input terminal conductively connected to the busbar negative copper bar and a second W-phase output terminal conductively connected to the W-phase output copper bar.

[0013] Preferably, a first capacitor terminal plate and a second capacitor terminal plate are provided at one of the long sides of the laminated copper busbar, and the first capacitor terminal plate and the second capacitor terminal plate face different sides of the laminated busbar; the first capacitor terminal plate is vertically connected to the long side of the busbar positive copper busbar, and the second capacitor terminal plate is vertically connected to the long side of the busbar negative copper busbar; the first capacitor terminal plate and the second capacitor terminal plate respectively have a plurality of capacitor terminals for connecting capacitor pins.

[0014] Preferably, a positive DC input board and a negative DC input board are provided at the first short side of the laminated copper busbar, and the positive DC input board and the negative DC input board face different sides of the laminated busbar; the positive DC input board is vertically connected to the first short side of the busbar positive copper busbar, and the negative DC input board is vertically connected to the first short side of the busbar negative copper busbar.

[0015] Preferably, the V-phase output copper bar is located between the U-phase output copper bar and the W-phase output copper bar, and the second short side of the laminated copper bar is provided with a U-phase output board, a V-phase output board and a W-phase output board, and the U-phase output board is vertically connected to the second short side of the U-phase output copper bar, the W-phase output board is vertically connected to the second short side of the W-phase output copper bar, the V-phase output board is connected to the second short side of the V-phase output copper bar and is located in the same plane as the V-phase output copper bar; the U-phase output board and the W-phase output board face different sides of the laminated busbar.

[0016] Preferably, the busbar positive copper bar, busbar negative copper bar, U-phase output copper bar, V-phase output copper bar, and W-phase output copper bar are arranged in sequence from the first side to the second side of the laminated copper bar, and the length of the long side of the V-phase output copper bar is smaller than the length of the long side of the U-phase output copper bar, and the length of the long side of the W-phase output copper bar is smaller than the length of the long side of the V-phase output copper bar.

[0017] Preferably, the first positive input terminal, the second positive input terminal, and the third positive input terminal are respectively composed of a first hollow stud welded to the busbar positive copper bar, and the first end of the first hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module, and the second end passes through the second side of the laminated copper bar and is fixedly connected with the first nut;

[0018] The first negative input terminal, the second negative input terminal, and the third negative input terminal are respectively composed of second hollow studs welded to the busbar negative copper bar, and the first end of the second hollow stud passes through the first side of the laminated copper bar and is fixedly connected to the second nut, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module;

[0019] The first U-phase output terminal and the second U-phase output terminal are composed of a third hollow stud welded to the U-phase output copper bar, wherein the first end of the third hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module, and the second end passes through the second side of the laminated copper bar and has a stud plane overlapping with the terminal of the power unit module;

[0020] The first V-phase output terminal and the second V-phase output terminal are composed of a fourth hollow stud welded to the V-phase output copper bar, wherein the first end of the fourth hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module;

[0021] The first W-phase output terminal and the second W-phase output terminal are composed of a fifth hollow stud welded to the W-phase output copper busbar, a first end of the fifth hollow stud passes through the first side of the laminated copper busbar and has a stud plane for overlapping with the terminal of the power unit module, and a second end passes through the second side of the laminated copper busbar and has a stud plane for overlapping with the terminal of the power unit module.

[0022] Preferably, there are safety-compliance insulating pads between the first hollow stud, the second hollow stud, the third hollow stud, the fourth hollow stud, the fifth hollow stud and the non-welded copper busbar.

[0023] An embodiment of the present invention further provides a three-phase high-power inverter, comprising a cabinet and six single-tube half-bridge arm high-power switch modules, wherein the three-phase high-power inverter further comprises the laminated copper busbar as described above, and the laminated copper busbar is vertically installed in the cabinet; wherein three single-tube half-bridge arm high-power switch modules are installed on a first side of the laminated copper busbar, and are respectively conductively connected to the first terminal group, the second terminal group, and the third terminal group; another three single-tube half-bridge arm high-power switch modules are installed on a second side of the laminated copper busbar, and are respectively conductively connected to the fourth terminal group, the fifth terminal group, and the sixth terminal group.

[0024] Preferably, the laminated copper busbar is installed in the cabinet in a manner perpendicular to the door panel of the cabinet, the cabinet has a fan, a first air duct and a second air duct, each of the single-tube half-bridge arm high-power switch modules includes a shell, and the shell has a first opening and a second opening; wherein:

[0025] The fan is located below the laminated copper busbar, the second air duct is adjacent to the back plate of the cabinet, and the first air duct is adjacent to the second air duct;

[0026] The air inlet of the first air duct is located at the air outlet of the fan, the first air duct includes a plurality of air outlets, and each air outlet of the first air duct is connected to a first opening of the housing of the single-tube half-bridge arm high-power switch module;

[0027] The air outlet of the second air duct is located at the back or top of the cabinet, the second air duct includes a plurality of air inlets, and each air inlet of the second air duct is connected to a second opening of the housing of the single-tube half-bridge arm high-power switch module.

[0028] The laminated copper busbar and three-phase high-power inverter provided by the embodiments of the present invention have the following beneficial effects: six single-tube half-bridge arm high-power switch modules are respectively installed in two planes through five-layer laminated copper busbars, which greatly improves the power density of the inverter, so that it can be used in industries with strict space requirements.

[0029] Furthermore, in the above inverter, each single-tube half-bridge arm high-power switch module forms an independent power module unit, which only needs to be maintained separately during maintenance, and is lighter in weight.

[0030] In addition, in the three-phase high-power inverter of the embodiment of the present invention, the heat of the cabinet module is more dispersed through the five-layer laminated copper busbar, so that only one fan is needed to achieve heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the circuit topology diagram of the three-phase inverter;

[0032] Figure 2 This is the circuit topology diagram of the dual-tube IGBT;

[0033] Figure 3 It is the circuit topology diagram of single-tube half-bridge high-power IGBT;

[0034] Figure 4 is a schematic diagram of a laminated copper bus provided by an embodiment of the present invention;

[0035] Figure 5 is an exploded schematic diagram of a laminated copper bus provided by an embodiment of the present invention;

[0036] Figure 6 is a schematic diagram of a capacitor installed on a laminated copper busbar provided in an embodiment of the present invention;

[0037] Figure 7 is a side view schematic diagram of a capacitor installed on a laminated copper busbar provided by an embodiment of the present invention;

[0038] Figure 8 is a partial cross-sectional schematic diagram of a laminated copper busbar provided in an embodiment of the present invention;

[0039] Fig. 9 is another partial cross-sectional schematic diagram of a laminated copper busbar provided by an embodiment of the present invention;

[0040] Fig.10 is a schematic diagram of a three-phase high-power inverter provided by an embodiment of the present invention;

[0041] Fig.11 1 is a schematic diagram of installing a single-tube half-bridge arm high-power switch module in a three-phase high-power inverter provided by an embodiment of the present invention;

[0042] Fig.12 Schematic diagram of a single-tube half-bridge arm high-power switch module in a three-phase high-power inverter provided by an embodiment of the present invention;

[0043] Fig.13 Schematic diagram of another single-tube half-bridge arm high-power switch module in the three-phase high-power inverter provided by an embodiment of the present invention;

[0044] Fig.14 Schematic diagram of the heat dissipation part in the three-phase high-power inverter provided by an embodiment of the present invention;

[0045] Fig.15 It is a side schematic diagram of the heat dissipation part in the three-phase high-power inverter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] like Figure 4-7 As shown, it is a schematic diagram of the structure of the laminated copper bar provided by an embodiment of the present invention, and the laminated copper bar can be applied to the inverter to realize input and output wiring. The laminated copper bar of this embodiment includes a busbar positive copper bar 10, a busbar negative copper bar 20, a U-phase output copper bar 30, a V-phase output copper bar 40, a W-phase output copper bar 50 and six insulating plates 60, wherein the busbar positive copper bar 10, the busbar negative copper bar 20, the U-phase output copper bar 30, the V-phase output copper bar 40, the W-phase output copper bar 50 and the six insulating plates 60 are fixed together by insulating fixings 70, and the busbar positive copper bar 10, the busbar negative copper bar 20, the U-phase output copper bar 30, the V-phase output copper bar 40 and the W-phase output copper bar 50 are respectively sandwiched between two adjacent insulating plates 60 (i.e., the busbar positive copper bar 10, the busbar negative copper bar 20, the U-phase output copper bar 30, the V-phase output copper bar 40, and the W-phase output copper bar 50 are located in different planes). The first side surface of the laminated copper busbar has a first terminal group, a second terminal group and a third terminal group arranged along the length direction of the laminated copper busbar and respectively used to connect the power unit module, and the second side surface of the laminated copper busbar has a fourth terminal group, a fifth terminal group and a sixth terminal group arranged along the length direction of the laminated copper busbar and respectively used to connect the power unit module.

[0048] The first terminal group, the second terminal group and the third terminal group can be connected to the upper bridge arm power unit module of the inverter respectively, that is, the three upper bridge arm power unit modules of the inverter can be installed on the first side of the above-mentioned laminated copper busbar; the fourth terminal group, the fifth terminal group and the sixth terminal group can be connected to the lower bridge arm power unit module of the inverter respectively, that is, the three lower bridge arm power unit modules of the inverter can be installed on the second side of the above-mentioned laminated copper busbar. The above-mentioned laminated copper busbar structure with five layers of copper busbars, due to the large number of stacking layers, not only has very good overall rigidity, which can meet the use of high vibration occasions, but also the above-mentioned laminated copper busbar disperses and installs the six half-bridge arm power unit modules on two planes, which greatly improves the power density of the inverter, so that it can be used in industries with strict space requirements. In addition, compared with the power module with integrated upper and lower bridge arms, the half-bridge arm power unit module is lighter and easier to maintain.

[0049] Specifically, the first terminal group may include a first positive input terminal 103 conductively connected to the busbar positive copper bar 10 and a first U-phase output terminal 302 conductively connected to the U-phase output copper bar 30. The second terminal group includes a second positive input terminal 104 conductively connected to the busbar positive copper bar 10 and a first V-phase output terminal 402 conductively connected to the V-phase output copper bar 40. The third terminal group includes a third positive input terminal 105 conductively connected to the busbar positive copper bar 10 and a first W-phase output terminal 502 conductively connected to the W-phase output copper bar 50. The fourth terminal group includes a first negative input terminal 203 conductively connected to the busbar negative copper bar 20 and a second U-phase output terminal 303 conductively connected to the U-phase output copper bar 50. The fifth terminal group includes a second negative input terminal 204 conductively connected to the busbar negative copper bar 20 and a second V-phase output terminal 403 conductively connected to the V-phase output copper bar 40. The sixth terminal group includes a third negative input terminal 205 conductively connected to the busbar negative copper bar 20 and a second W-phase output terminal 503 conductively connected to the W-phase output copper bar 50 .

[0050] In order to realize the installation of the bus capacitor 80 in the inverter, the laminated copper bus provided in the embodiment of the present invention has a first capacitor terminal plate 102 and a second capacitor terminal plate 202 at one of the long sides (the first capacitor terminal plate 102 and the second capacitor terminal plate 202 are located in the same plane), and the first capacitor terminal plate 102 and the second capacitor terminal plate 202 face different sides of the laminated copper bus. The first capacitor terminal plate 102 is vertically connected to a long side of the bus positive copper bus 10, the second capacitor terminal plate 202 is vertically connected to a long side of the bus negative copper bus 20, and the first capacitor terminal plate 102 and the second capacitor terminal plate 202 respectively have a plurality of capacitor terminals for connecting the pins of the bus capacitor 80. Through the above structure, the installation surface of the bus capacitor 80 can be perpendicular to the installation plane of the power unit module, thereby reducing the area of ​​the laminated copper bus in the same dimension and improving the power density of the inverter. In particular, when the bus positive copper bar 10 is located on the first side of the bus negative copper bar 20, the first capacitor terminal plate 102 can be formed by vertically bending the long side of the bus positive copper bar 10 toward the first side of the laminated copper bar, and the second capacitor terminal plate 02 can be formed by vertically bending the long side of the bus negative copper bar 20 toward the second side of the laminated copper bar.

[0051] Preferably, the laminated copper busbar can realize DC input in the following manner: a positive DC input board 101 and a negative DC input board 201 are arranged at the first short side of the laminated copper busbar (the positive DC input board 101 and the negative DC input board 201 are located in the same plane), and the positive DC input board 101 and the negative DC input board 201 face different sides of the laminated copper busbar. The positive DC input board 101 is vertically connected to the first short side of the busbar positive copper busbar 10, and the negative DC input board 201 is vertically connected to the first short side of the busbar negative copper busbar 20. In this way, the DC input part of the laminated copper busbar is perpendicular to the installation plane of the power unit module, further reducing the area of ​​the laminated copper busbar in the same dimension, and improving the power density of the inverter. Similarly, when the bus positive copper bar 10 is located on the first side of the bus negative copper bar 20, the above-mentioned positive DC input board 101 can be formed by vertically bending the first short side of the bus positive copper bar 10 toward the first side of the laminated copper bar, and the negative DC input board 201 can be formed by vertically bending the first short side of the bus negative copper bar 20 toward the second side of the laminated copper bar.

[0052] In the above-mentioned laminated copper bar, the V-phase output copper bar 40 is located between the U-phase output copper bar 30 and the W-phase output copper bar 50 (there is an insulating plate 60 between the copper bars). Similarly, the above-mentioned laminated copper bar can realize three-phase AC output in the following manner: a U-phase output board 301, a V-phase output board 401 and a W-phase output board 501 are arranged at the second short side of the laminated copper bar (the U-phase output board 301 and the W-phase output board 501 are located in the same plane), and the U-phase output board 301 is vertically connected to the second short side of the U-phase output copper bar 30, the W-phase output board 501 is vertically connected to the second short side of the W-phase output copper bar 50, and the V-phase output board 401 is connected to the second short side of the V-phase output copper bar 40 and is located in the same plane with the V-phase output copper bar 40. In addition, the above-mentioned U-phase output board 301 and the W-phase output board 501 face different sides of the laminated copper bar. In this way, the three-phase AC output part of the laminated copper bar is perpendicular to the installation plane of the power unit module, further reducing the area of ​​the laminated copper bar in the same dimension, and improving the power density of the inverter. In particular, when the U-phase output copper bar 30 is located on the first side of the W-phase output copper bar 50, the above-mentioned U-phase output plate 301 can be formed by the second short side of the U-phase output copper bar 30 being vertically bent toward the first side of the laminated copper bar, the W-phase output plate 501 can be formed by the second short side of the W-phase output copper bar 50 being vertically bent toward the second side of the laminated copper bar, and the V-phase output plate 401 can be formed by extending the V-phase output copper bar 40 (or by a connecting plate welded to the V-phase output copper bar 40).

[0053] Specifically, the busbar positive copper bar 10, busbar negative copper bar 20, U-phase output copper bar 30, V-phase output copper bar 40, and W-phase output copper bar 50 are arranged in sequence from the first side to the second side of the laminated copper bar, and the lengths of the long sides of the busbar positive copper bar 10 and the busbar negative copper bar 20 are equal, the length of the long side of the U-phase output copper bar 30 may be slightly smaller than the length of the long side of the busbar negative copper bar 20, the length of the long side of the V-phase output copper bar 40 is smaller than the length of the long side of the U-phase output copper bar 30, and the length of the long side of the W-phase output copper bar 50 is smaller than the length of the long side of the V-phase output copper bar 40. Through this structure, the material of the laminated copper bar itself can be saved and the cost can be reduced.

[0054] Combination Figure 8As shown, the first positive input terminal 103, the second positive input terminal 104, and the third positive input terminal 105 can be respectively composed of a first hollow stud 71 welded to the busbar positive copper bar 10, and the first end of the first hollow stud 71 passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the first side of the laminated copper bar, and the second end passes through the second side of the laminated copper bar and is fixedly connected with the first nut 77. The first hollow stud 71 can not only realize the busbar positive voltage output of the upper bridge arm power unit module on the first side of the laminated copper bar, but also fasten the five-layer copper bar to improve the bonding strength of the laminated copper bar. In order to meet the safety requirements, the first hollow stud 71 and the non-welded copper bar (i.e., the busbar negative copper bar 20, the U-phase output copper bar 30, the V-phase output copper bar 40, and the W-phase output copper bar 50) are provided with a safety insulation ring 76.

[0055] Similarly, the first negative input terminal 203, the second negative input terminal 204, and the third negative input terminal 205 are respectively composed of a second hollow stud 72 welded to the busbar negative copper bar 20, and the first end of the second hollow stud 72 passes through the first side of the laminated copper bar and is fixedly connected to the second nut 78, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the second side of the laminated copper bar (the second end can also be fixedly connected to a second nut 78). Similarly, the above-mentioned second hollow stud 72 can not only realize the busbar negative voltage output of the lower bridge arm power unit module on the second side of the laminated copper bar, but also fasten the five-layer copper bar to improve the bonding strength of the laminated copper bar. In order to meet the safety requirements, the above-mentioned second hollow stud 72 and the non-welded copper bar (i.e., the busbar positive copper bar 10, the U-phase output copper bar 30, the V-phase output copper bar 40, and the W-phase output copper bar 50) have a safety insulation ring 76 to avoid the safety requirements.

[0056] Combination Fig. 9 As shown, the first W-phase output terminal 502 and the second W-phase output terminal 503 can be composed of a fifth hollow stud 75 welded to the W-phase output copper bar 50, the first end of the fifth hollow stud 75 passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the first side of the laminated copper bar, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the second side of the laminated copper bar. In order to meet the safety requirements, the fifth hollow stud 75 and the non-welded copper bar (i.e., the busbar positive copper bar 10, the busbar negative copper bar 20, the U-phase output copper bar 30, and the V-phase output copper bar 40) are provided with a safety insulation ring 76.

[0057] Similarly, the first U-phase output terminal 302 and the second U-phase output terminal 303 may be formed by a third hollow stud welded to the U-phase output copper bar 30, the first end of the third hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the first side of the laminated copper bar, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the second side of the laminated copper bar. In order to meet safety requirements, there is a safety insulation ring between the third hollow stud and the non-welded copper bar (i.e., the busbar positive copper bar 10 and the busbar negative copper bar 20) to avoid safety requirements.

[0058] Similarly, the first V-phase output terminal 402 and the second V-phase output terminal 403 may be formed by a fourth hollow stud welded to the V-phase output copper bar 40, the first end of the fourth hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the first side of the laminated copper bar, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module on the second side of the laminated copper bar. In order to meet safety requirements, the fourth hollow stud and the non-welded copper bar (i.e., the busbar positive copper bar 10, the busbar negative copper bar 20, and the U-phase output copper bar 30) are provided with a safety insulation ring to avoid the safety requirements.

[0059] The first hollow stud 71, the second hollow stud 72, the third hollow stud, the fourth hollow stud and the fifth hollow stud 75 may respectively have axial threaded through holes, so that the copper busbar studs of the power unit module on the first side and the second side of the laminated copper busbar can be reliably fixed to the first hollow stud 71, the second hollow stud 72, the third hollow stud, the fourth hollow stud and the fifth hollow stud 75 by bolts to ensure reliable electrical connection.

[0060] like Fig.10As shown, it is a structural schematic diagram of a three-phase high-power inverter provided by an embodiment of the present invention, and the three-phase high-power inverter can be applied to high-power motor control. The three-phase high-power inverter of this embodiment includes a cabinet 90 and six single-tube half-bridge arm high-power switch modules (i.e., U-phase upper bridge arm power unit module 81, V-phase upper bridge arm power unit module 82, W-phase upper bridge arm power unit module 83, U-phase lower bridge arm power unit module 84, V-phase lower bridge arm power unit module 85, W-phase lower bridge arm power unit module 86), and the three-phase high-power inverter also includes the laminated copper busbar as described above, and the laminated copper busbar is vertically installed in the cabinet 90; wherein, three single-tube half-bridge arm high-power switch modules (i.e., U-phase upper bridge arm power unit module 81, V-phase upper bridge arm power unit module 82, W-phase upper bridge arm power unit module 83, U-phase lower bridge arm power unit module 84, V-phase lower bridge arm power unit module 85, W-phase lower bridge arm power unit module 86) are provided. The power unit module 81, the V-phase upper bridge arm power unit module 82, the W-phase upper bridge arm power unit module 83) are installed on the first side of the laminated copper busbar and are conductively connected to the first terminal group, the second terminal group and the third terminal group respectively; the other three single-tube half-bridge arm high-power switch modules (i.e., the U-phase lower bridge arm power unit module 84, the V-phase lower bridge arm power unit module 85, the W-phase lower bridge arm power unit module 86) are installed on the second side of the laminated copper busbar and are conductively connected to the fourth terminal group, the fifth terminal group and the sixth terminal group respectively.

[0061] The following takes the W-phase upper bridge arm power unit module 83 and the W-phase lower bridge arm power unit module 86 as examples to illustrate the single-tube half-bridge arm high-power switch module and its structure installed on the laminated copper busbar.

[0062] like Fig.12 As shown, the W-phase upper bridge arm power unit module 83 includes a housing 830, and the housing has an air inlet (not shown in the figure) and an air outlet 8302, a busbar positive connection bar 831 and a W-phase output connection bar 833 are respectively fixed to the housing, and the busbar positive connection bar 831 has a busbar positive mounting hole 8311, and the W-phase output connection bar 833 has a W-phase output mounting hole 8331. The structures of the U-phase upper bridge arm power unit module 81 and the V-phase upper bridge arm power unit module 82 are similar to those of the W-phase upper bridge arm power unit module 83.

[0063] like Fig.13 As shown, the W-phase lower bridge arm power unit module 86 includes a housing 860, and the housing has an air inlet (not shown) and an air outlet 8602, a busbar negative connection bar 861 and a W-phase output connection bar 863 are respectively fixed to the housing, and the busbar negative connection bar 861 has a busbar negative mounting hole 8611, and the W-phase output connection bar 863 has a W-phase output mounting hole 8631. The structures of the U-phase lower bridge arm power unit module 84 and the V-phase lower bridge arm power unit module 85 are similar to those of the W-phase lower bridge arm power unit module 86.

[0064] like Fig.11As shown, the W-phase output connection bar 863 of the W-phase lower bridge arm power unit module 86 is fixedly connected to the laminated copper bar by the bolt 79 passing through the W-phase output mounting hole 8631 and threadedly connected to the fifth hollow stud 75, and is conductively connected to the second W-phase output terminal 503. Similarly, the busbar negative connection bar 861 of the W-phase lower bridge arm power unit module 86 is fixedly connected to the laminated copper bar by the bolt passing through the busbar negative mounting hole 8611 and threadedly connected to the second hollow stud 72, and is conductively connected to the third negative input terminal 205. The U-phase upper bridge arm power unit module 81, the V-phase upper bridge arm power unit module 82, the W-phase upper bridge arm power unit module 83, the U-phase lower bridge arm power unit module 84, and the V-phase lower bridge arm power unit module 85 are fixed to the laminated copper bar in a similar manner.

[0065] like Figure 14-15 As shown, the laminated copper busbar is installed in the cabinet 90 in a manner perpendicular to the door panel of the cabinet 90. The cabinet 90 has a fan 87, a first air duct 91 and a second air duct 92, and the fan 87 is located below the laminated copper busbar. The second air duct is arranged adjacent to the back plate 93 of the cabinet 90, and the first air duct 91 is arranged adjacent to the second air duct 92. The air inlet of the first air duct 91 is located at the air outlet of the fan 87. The first air duct 91 includes a plurality of air outlets, and each air outlet of the first air duct 1 is connected to the first opening of the housing of a single-tube half-bridge arm high-power switch module. The air outlet of the second air duct 92 is located at the back or top of the cabinet 90. The second air duct 92 includes a plurality of air inlets, and each air inlet of the second air duct 92 is connected to the second opening of the housing of a single-tube half-bridge arm high-power switch module.

[0066] Compared with the structure of the existing inverter that requires a fan for each group of modules, the above three-phase high-power inverter uses a five-layer laminated copper busbar, so that the heat of the modules in the cabinet 90 is more dispersed. Through the independent curved air duct, only one high-power cooling fan is needed in the cabinet 90 to dissipate the heat of the radiator of the six single-tube half-bridge arm high-power switch modules, which greatly improves the cabinet space of the entire three-phase high-power inverter, so that the size of the 1.2MW three-phase high-power inverter can reach height x depth x width = 2000x600x600mm. Compared with the existing inverter with a three-layer laminated copper busbar structure, the width of the cabinet 90 can be reduced by 200mm.

[0067] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A laminated copper busbar, characterized in that: The invention comprises a busbar positive copper bar, a busbar negative copper bar, a U-phase output copper bar, a V-phase output copper bar, a W-phase output copper bar and six insulating plates fixed together by insulating fixing members, and the busbar positive copper bar, the busbar negative copper bar, the U-phase output copper bar, the V-phase output copper bar and the W-phase output copper bar are respectively sandwiched between two adjacent insulating plates; the first side surface of the laminated copper bar has a first terminal group, a second terminal group and a third terminal group arranged along the length direction of the laminated copper bar and respectively used to connect the power unit module, and the second side surface of the laminated copper bar has a fourth terminal group, a fifth terminal group and a sixth terminal group arranged along the length direction of the laminated copper bar and respectively used to connect the power unit module; The first short side of the laminated copper bar is provided with a positive DC input board and a negative DC input board; the V-phase output copper bar is located between the U-phase output copper bar and the W-phase output copper bar; the second short side of the laminated copper bar is provided with a U-phase output board, a V-phase output board and a W-phase output board, and the U-phase output board is vertically connected to the second short side of the U-phase output copper bar, the W-phase output board is vertically connected to the second short side of the W-phase output copper bar, the V-phase output board is connected to the second short side of the V-phase output copper bar and is located in the same plane with the V-phase output copper bar; the U-phase output board and the W-phase output board face different sides of the laminated copper bar.

2. The laminated copper busbar according to claim 1, characterized in that: The first terminal group includes a first positive input terminal conductively connected to the busbar positive copper bar and a first U-phase output terminal conductively connected to the U-phase output copper bar; The second terminal group includes a second positive input terminal conductively connected to the busbar positive copper bar and a first V-phase output terminal conductively connected to the V-phase output copper bar; The third terminal group includes a third positive input terminal conductively connected to the busbar positive copper bar and a first W-phase output terminal conductively connected to the W-phase output copper bar; The fourth terminal group includes a first negative input terminal conductively connected to the busbar negative copper bar and a second U-phase output terminal conductively connected to the U-phase output copper bar; The fifth terminal group includes a second negative input terminal conductively connected to the busbar negative copper bar and a second V-phase output terminal conductively connected to the V-phase output copper bar; The sixth terminal group includes a third negative input terminal conductively connected to the busbar negative copper bar and a second W-phase output terminal conductively connected to the W-phase output copper bar.

3. The laminated copper busbar according to claim 1, characterized in that: A first capacitor terminal plate and a second capacitor terminal plate are provided at one of the long sides of the laminated copper busbar, and the first capacitor terminal plate and the second capacitor terminal plate face different sides of the laminated copper busbar; the first capacitor terminal plate is vertically connected to the long side of the busbar positive copper busbar, and the second capacitor terminal plate is vertically connected to the long side of the busbar negative copper busbar; the first capacitor terminal plate and the second capacitor terminal plate respectively have a plurality of capacitor terminal blocks for connecting capacitor pins.

4. The laminated copper busbar according to claim 1, characterized in that: The positive DC input board and the negative DC input board face different sides of the laminated copper bar; the positive DC input board is vertically connected to the first short side of the busbar positive copper bar, and the negative DC input board is vertically connected to the first short side of the busbar negative copper bar.

5. The laminated copper busbar according to claim 2, characterized in that: The busbar positive copper bar, busbar negative copper bar, U-phase output copper bar, V-phase output copper bar, and W-phase output copper bar are arranged in sequence from the first side to the second side of the laminated copper bar, and the length of the long side of the V-phase output copper bar is smaller than the length of the long side of the U-phase output copper bar, and the length of the long side of the W-phase output copper bar is smaller than the length of the long side of the V-phase output copper bar.

6. The laminated copper busbar according to claim 5, characterized in that: The first positive input terminal, the second positive input terminal, and the third positive input terminal are respectively composed of a first hollow stud welded to the busbar positive copper bar, and the first end of the first hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module, and the second end passes through the second side of the laminated copper bar and is fixedly connected to the first nut; The first negative input terminal, the second negative input terminal, and the third negative input terminal are respectively composed of second hollow studs welded to the busbar negative copper bar, and the first end of the second hollow stud passes through the first side of the laminated copper bar and is fixedly connected to the second nut, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module; The first U-phase output terminal and the second U-phase output terminal are composed of a third hollow stud welded to the U-phase output copper bar, wherein the first end of the third hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module, and the second end passes through the second side of the laminated copper bar and has a stud plane overlapping with the terminal of the power unit module; The first V-phase output terminal and the second V-phase output terminal are composed of a fourth hollow stud welded to the V-phase output copper bar, wherein the first end of the fourth hollow stud passes through the first side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module, and the second end passes through the second side of the laminated copper bar and has a stud plane for overlapping with the terminal of the power unit module; The first W-phase output terminal and the second W-phase output terminal are composed of a fifth hollow stud welded to the W-phase output copper busbar, a first end of the fifth hollow stud passes through the first side of the laminated copper busbar and has a stud plane for overlapping with the terminal of the power unit module, and a second end passes through the second side of the laminated copper busbar and has a stud plane for overlapping with the terminal of the power unit module.

7. The laminated copper busbar according to claim 6, characterized in that: Safety-compliance insulating pads are provided between the first hollow stud, the second hollow stud, the third hollow stud, the fourth hollow stud, the fifth hollow stud and the non-welded copper busbar.

8. A three-phase high-power inverter, comprising a cabinet and six single-tube half-bridge arm high-power switch modules, characterized in that: The three-phase high-power inverter also includes a laminated copper busbar as described in any one of claims 1 to 7, and the laminated copper busbar is vertically installed in the cabinet; wherein three single-tube half-bridge arm high-power switch modules are installed on a first side of the laminated copper busbar and are respectively conductively connected to the first terminal group, the second terminal group and the third terminal group; another three single-tube half-bridge arm high-power switch modules are installed on a second side of the laminated copper busbar and are respectively conductively connected to the fourth terminal group, the fifth terminal group and the sixth terminal group.

9. The three-phase high-power inverter according to claim 8, characterized in that: The laminated copper busbar is installed in the cabinet in a manner perpendicular to the door panel of the cabinet, and a fan, a first air duct and a second air duct are arranged in the cabinet. Each of the single-tube half-bridge arm high-power switch modules includes a shell, and the shell has a first opening and a second opening; wherein: The fan is located below the laminated copper busbar, the second air duct is adjacent to the back plate of the cabinet, and the first air duct is adjacent to the second air duct; The air inlet of the first air duct is located at the air outlet of the fan, the first air duct includes a plurality of air outlets, and each of the air outlets of the first air duct is connected to a first opening of the housing of a single-tube half-bridge arm high-power switch module; The air outlet of the second air duct is located at the back or top of the cabinet, the second air duct includes a plurality of air inlets, and each of the air inlets of the second air duct is connected to a second opening of the housing of the single-tube half-bridge arm high-power switch module.

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