Laminated busbar for IGBT protection against inrush current in synchronous reluctance controllers

Abstract

The present invention belongs to the field of application technology of electrical connection components, and specifically discloses a laminated busbar for use in a synchronous reluctance controller to protect an IGBT from inrush current. The laminated busbar comprises a fan cover, a contactor, a second capacitor, a grounding terminal, a circuit breaker and a heat sink, a heat sink fixing plate, a base plate, a cross support frame, a terminal mounting plate, a grounding terminal, a positive connection terminal block, a negative connection terminal block, a connecting copper bar, a W connection copper bar, a resistor connection copper bar, a first circuit breaker connection copper bar, and a second circuit breaker connection copper bar, wherein the positive connection terminal block and the negative connection terminal block are connected to the positive busbar and the negative busbar, respectively. The present invention has the following beneficial effects: 1. Lower overall cost; 2. High reliability and safety; 3. Simple and compact design that saves a lot of space; 4. Very low inductance (for switching devices such as IGBTs, it can avoid breakdown caused by surge voltage); 5. Very low impedance, greatly reducing the probability of installation errors.

Description

Technical Field

[0001] The present invention belongs to the technical field of application of electrical connection components, and in particular relates to a laminated busbar for an IGBT of a synchronous reluctance controller for anti-inrush current protection. Background Art

[0002] Generally speaking, the insulation between the copper busbars in traditional electrical cabinets and domestic inverters is achieved by spatial distance, which takes up a large space in the electrical cabinet. The copper busbars in the electrical cabinet cannot withstand the huge impact current, causing important components in the electrical cabinet (IGBT components, capacitors, etc.) to be broken down, burning the electrical cabinet and causing irreparable losses. At the same time, the electrical performance is poor, there are many connection points, and the reliability and anti-pollution ability are poor.

[0003] The main disadvantages are as follows: 1. Traditional copper busbars have poor insulation grades, poor resistance to high voltage and high current, and poor heat dissipation capabilities; 2. Once traditional copper busbars are subjected to huge impact voltages and currents, they cannot guarantee the protection of IGBTs, capacitors, power supplies and other equipment in the electrical cabinet; 3. The installation and disassembly of copper busbars are more complicated and prone to errors, and it takes a lot of time to replace its parts; 4. The copper base is exposed, prone to aging, heat generation, and a short lifespan (three years), which cannot meet the electrical design requirements.

[0004] Based on the above problems, the present invention provides a laminated busbar for protecting IGBTs against inrush current in synchronous reluctance controllers. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to address the deficiencies in the prior art and provide a laminated busbar for protecting IGBTs in synchronous reluctance controllers against inrush currents, thereby resolving the problems existing in the current use of laminated busbars in the background technology. The invention is suitable for synchronous reluctance (magnetic assist) controllers to protect important components (IGBTs) and other original parts of the controller from being affected by inrush currents and voltages.

[0006] Technical solution: The present invention provides a laminated busbar for anti-inrush current protection IGBT of a synchronous reluctance controller, comprising a fan cover, a first capacitor, a resistor, a single-arm bridge, an IGBT, a transformer, a contactor, a second capacitor, a grounding terminal, a circuit breaker and a radiator. The radiator is installed in a radiator fixing plate, the radiator fixing plate is installed on a base plate, cross support frames are provided on both sides of the bottom surface of the base plate, a terminal mounting plate is provided at one end of the base plate, a grounding terminal is provided on the terminal mounting plate, a positive connection terminal row, a negative connection terminal row, a connection copper bar, a W connection copper bar, a resistor connection copper bar, a first circuit breaker connection copper bar, and a second circuit breaker connection copper bar are respectively provided on the grounding terminal, the positive connection terminal row and the negative connection terminal row are respectively connected to the positive busbar and the negative busbar; wherein, the positive busbar and the negative busbar are stacked and composed, and the surfaces of the positive busbar and the negative busbar are respectively evenly sprayed with an insulating resin coating.

[0007] In the present technical solution, the surfaces of the positive busbar and the negative busbar are respectively evenly sprayed with an insulating resin coating with a thickness of 3 mm, wherein the insulating resin coating includes but is not limited to high-performance epoxy resin.

[0008] In the technical solution, the laminated busbar for the synchronous reluctance controller to protect the IGBT against inrush current also includes a rectifier bridge positive connection copper busbar and a rectifier bridge negative connection copper busbar connected to the positive busbar and the negative busbar, a rectifier bridge connection copper busbar connected to the positive busbar, and a T-shaped copper busbar connected to the single-arm bridge and the contactor respectively.

[0009] In the technical solution, the laminated busbar for the synchronous reluctance controller to protect the IGBT against inrush current also includes a copper busbar for connecting the positive and negative poles of the first capacitor; wherein the copper busbars for connecting the positive and negative poles of the first capacitor are respectively connected to the positive busbar and the negative busbar, and the connecting copper busbars are connected to the copper busbars for connecting the positive and negative poles of the first capacitor, and three groups of first capacitors are provided.

[0010] In the technical solution, the laminated busbar for the synchronous reluctance controller to protect the IGBT against inrush current further includes a grounding copper busbar connected to the negative busbar; wherein the grounding copper busbar is connected to the grounding terminal.

[0011] In the technical solution, the laminated busbar for the synchronous reluctance controller to protect the IGBT against inrush current also includes a first IGBT connecting copper busbar and a second IGBT connecting copper busbar respectively connected to the second capacitor; wherein the connecting copper busbars are respectively connected to the first IGBT connecting copper busbar and the second IGBT connecting copper busbar, and three second capacitors are provided.

[0012] In the technical solution, the laminated busbar for the synchronous reluctance controller to protect the IGBT against inrush current also includes a positive busbar support column and a negative busbar support column respectively arranged at the same end of the positive busbar and the negative busbar, and not in position; wherein the positive busbar support column and the negative busbar support column vertically support and fix the positive busbar and the negative busbar above the IGBT.

[0013] In the present technical solution, the width dimensions of the positive busbar and the negative busbar are the same, and the length dimension of the positive busbar is greater than the length dimension of the negative busbar; wherein, the thickness dimensions of the positive busbar and the negative busbar are the same.

[0014] In the technical solution, the laminated busbar for the synchronous reluctance controller anti-inrush current protection IGBT also includes a contactor bracket for mounting the contactor, and a first circuit breaker control mounting plate support bracket and a second circuit breaker control mounting plate support bracket for mounting the circuit breaker; wherein the contactor bracket, the first circuit breaker control mounting plate support bracket and the second circuit breaker control mounting plate support bracket are respectively arranged on the radiator fixing plate.

[0015] Compared with the prior art, the laminated busbar for the synchronous reluctance controller anti-inrush current protection IGBT of the present invention has the following beneficial effects: 1. Lower overall cost; 2. High reliability and high safety; 3. Simple and compact design can save a lot of space; 4. Very low inductance (for switching devices such as IGBT, it can avoid breakdown caused by surge voltage); 5. Very low impedance; 6. Greatly reduced probability of installation errors; 7. Convenient on-site installation and service; 8. Increased partial capacitance, under the same conditions, compared with cables, the current carrying capacity is greatly improved; 9. Under the same current carrying conditions, compared with cables, its temperature rise is lower; 10. Its structure is to stack two or more layers of copper busbars together, and the copper plate layers are separated by insulating materials. Electrical isolation, through related processes, the conductive layer and the insulating layer are pressed into a whole. Its advantage is that the connecting wire is made into a flat cross-section, which increases the surface area of ​​the conductive layer under the same current cross-section. At the same time, the spacing between the conductive layers is greatly reduced. Due to the proximity effect, opposite currents flow through adjacent conductive layers, and the magnetic fields they generate cancel each other out, thereby greatly reducing the distributed inductance in the circuit; 11. It has better current carrying capacity, lower temperature rise, and better heat dissipation and cooling effect; 12. It reduces the distributed inductance of the circuit, especially for the application of IGBT. Reduce the probability of damage to electrical components due to voltage breakdown; 13. On the one hand, it reduces the IGBT reverse peak voltage and improves the reliability of the system, and on the other hand, it reduces system noise and electromagnetic interference and radio frequency interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0017] Figure 1 It is a schematic diagram of the exploded structure of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention;

[0018] Figure 2 This is a schematic diagram of the assembled structure of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the negative busbar of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the positive busbar of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention;

[0021] Figure 5 This is a schematic structural diagram of the negative busbar and the positive busbar of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention before being superimposed and assembled;

[0022] Figure 6 It is a schematic top view of the structure of the grounding terminal, etc. of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention;

[0023] Figure 7 It is a schematic diagram of the top view layout structure of the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle", "inside", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, or they can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller shown includes a fan cover 4, a first capacitor 5, a resistor 6, a single-arm bridge 7, an IGBT 8, a transformer 9, a contactor 13, a second capacitor 23, a grounding terminal 26, a circuit breaker 34 and a heat sink 35.

[0028] The radiator 35 is installed in the radiator fixing plate 3, and the radiator fixing plate 3 is installed on the bottom plate 2. The bottom surface of the bottom plate 2 is provided with a horizontal support frame 1 on both sides. The terminal mounting plate 12 is provided at one end of the bottom plate 2. The ground terminal 26 is provided on the terminal mounting plate 12.

[0029] The grounding terminal 26 is provided with a positive connection terminal block 39, a negative connection terminal block 40, a connection copper bar 25, a W connection copper bar 29, a resistor connection copper bar 30, a first circuit breaker connection copper bar 31, and a second circuit breaker connection copper bar 32. The positive connection terminal block 39 and the negative connection terminal block 40 are connected to the positive busbar 17 and the negative busbar 36 respectively.

[0030] The positive busbar 17 and the negative busbar 36 are stacked together, and the surfaces of the positive busbar 17 and the negative busbar 36 are respectively evenly sprayed with an insulating resin coating.

[0031] In addition, preferably, the surfaces of the positive busbar 17 and the negative busbar 36 are respectively evenly sprayed with an insulating resin coating with a thickness of 3 mm, wherein the insulating resin coating includes but is not limited to high-performance epoxy resin.

[0032] Example 2

[0033] On the basis of Example 1, the laminated busbar for the anti-inrush current protection IGBT of the synchronous reluctance controller also includes a rectifier bridge positive connection copper busbar 11 connected to the positive busbar 17 and the negative busbar 36, a rectifier bridge negative connection copper busbar 14, a rectifier bridge connection copper busbar 16 connected to the positive busbar 17, and a T-shaped copper busbar 15 connected to the single-arm bridge 7 and the contactor 13 respectively.

[0034] Example 3

[0035] On the basis of the first or second embodiment, the laminated busbar for the synchronous reluctance controller to protect the IGBT against inrush current further includes a first capacitor positive and negative electrode connecting copper busbar 20;

[0036] Among them, the positive and negative electrodes of the first capacitor are connected to the copper bars 20 respectively connected to the positive busbar 17 and the negative busbar 36, the connecting copper bar 25 is connected to the positive and negative electrodes of the first capacitor 20, and three groups of first capacitors 5 are set.

[0037] Example 4

[0038] On the basis of the first embodiment, the second embodiment or the third embodiment, the laminated busbar for the synchronous reluctance controller for protecting the IGBT from inrush current further includes a grounding copper busbar 18 connected to the negative busbar 36;

[0039] The grounding copper bus 18 is connected to the grounding terminal 26 .

[0040] Example 5

[0041] On the basis of the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment, the laminated busbar for the IGBT of the synchronous reluctance controller against inrush current protection further includes a first IGBT connecting copper busbar 21 and a second IGBT connecting copper busbar 22 respectively connected to the second capacitor 23;

[0042] The connecting copper busbar 25 is connected to the first IGBT connecting copper busbar 21 and the second IGBT connecting copper busbar 22 respectively, and three second capacitors 23 are provided.

[0043] Example 6

[0044] On the basis of the first, second, third, fourth, or fifth embodiment, the laminated busbar for the synchronous reluctance controller for protecting the IGBT from inrush current further includes a positive busbar support column 37 and a negative busbar support column 38 respectively disposed at the same end of the positive busbar 17 and the negative busbar 36 and not in alignment;

[0045] The positive busbar support column 37 and the negative busbar support column 38 vertically support and fix the positive busbar 17 and the negative busbar 36 above the IGBT 8 .

[0046] In addition, the positive busbar 17 and the negative busbar 36 preferably have the same width dimensions, and the length dimension of the positive busbar 17 is greater than the length dimension of the negative busbar 36; wherein, the positive busbar 17 and the negative busbar 36 have the same thickness dimensions.

[0047] In addition, the preferred laminated busbar for the synchronous reluctance controller anti-inrush current protection IGBT also includes a contactor bracket 10 for mounting the contactor 13, and a first circuit breaker control mounting plate support frame 19 and a second circuit breaker control mounting plate support frame 24 for mounting the circuit breaker 34;

[0048] The contactor bracket 10 , the first circuit breaker control mounting plate support bracket 19 , and the second circuit breaker control mounting plate support bracket 24 are respectively arranged on the radiator fixing plate 3 .

[0049] In addition, further Figure 6 The markings on the grounding terminal 26 shown are: R, S, T - AC380V incoming line terminals; P1, (+) are positive connection terminal block 39; negative connection terminal block 40, consisting of two terminals connected by a copper busbar shorting piece; U, V, W - controller output terminals.

[0050] The working principle or structural principle of the laminated busbar of this structure for the anti-inrush current protection IGBT of the synchronous reluctance controller is as follows:

[0051] The radiator 35 is mounted on the horizontal support frame 1, the bottom plate 2, the radiator fixing plate 3, and the fan cover 4.

[0052] The positive and negative electrodes of the first capacitor 5 are connected to the positive busbar 17 and the negative busbar 36 through the first capacitor positive and negative electrode connecting copper bar 20. The negative busbar 36 is connected to the rectifier bridge negative electrode connecting copper bar 14. The positive busbar 17 is connected to the rectifier bridge positive electrode connecting copper bar 11. The grounding terminal 26 is provided with a connecting copper bar 25. The connecting copper bar 25 is respectively connected to the positive and negative electrode connecting copper bar 20 of the first capacitor 5. The positive busbar 17 and the negative busbar 36 are fixed to the upper end of the IGBT 8. The bottom surface of one end of the busbar 36 is provided with a first circular copper column 37 for support, and the bottom surface of one end of the busbar 17 is provided with a second circular copper column 38 for support;

[0053] The rectifier bridge negative connecting piece 14 (hole on the right) and the rectifier bridge positive connecting piece 11 (hole on the left) are respectively connected to the single-arm bridge 7. The hole on the right side of the single-arm bridge 7 is connected to the outlet of the circuit breaker 34 through the copper busbar 32. The middle hole of the single-arm bridge 7 is connected to the busbar positive electrode P(+) 26 through the copper busbar. The hole on the left side of the single-arm bridge 7 is connected to the positive busbar 17 through the rectifier bridge connection copper busbar 16. The middle hole of the single-arm bridge 7 is connected to the contactor 13 through the T-shaped copper busbar 15.

[0054] The transformer 9 is mounted on the radiator fixing plate 3 and is in contact with the contactor 13;

[0055] The second capacitor 23 is provided with a first IGBT connecting copper bar 21 and a second IGBT connecting copper bar 22, respectively. The grounding terminal 26 is connected to the heat sink fixing plate 3 and is connected to the first IGBT connecting copper bar 21 and the first IGBT connecting copper bar 22 through the connecting copper bar 25.

[0056] A W-connecting copper bar 29 is provided on the grounding terminal 26, and the W-connecting copper bar 29 is connected to the W-connecting copper bar 29;

[0057] The drive board fixing bracket 28 is mounted on the base plate 2, the drive board mounting plate 27 is mounted on the drive board fixing bracket 28, the resistor 6 is mounted on the drive board fixing bracket 28, the circuit breaker 34 is mounted on the circuit breaker control mounting plate 33, the grounding terminal 26 is provided with a resistor connecting copper busbar 30 connected to the resistor 6, the grounding terminal 26 is provided with a grounding copper busbar 18 connected to the negative busbar 36, and the grounding terminal 26 is provided with a first circuit breaker connecting copper busbar 31 and a second circuit breaker connecting copper busbar 32 connected to the circuit breaker 34;

[0058] The ground terminal 26 is provided with a positive connection terminal block 39 and a negative connection terminal block 40 connected to the positive busbar 17 and the negative busbar 36 respectively.

[0059] In addition, further Figure 5 As shown, the upper layer is the negative busbar 36; the lower layer is the positive busbar 17. The surfaces of the positive busbar 17 and the negative busbar 36 are respectively coated with high-performance epoxy resin for insulation treatment, and finally the coated busbars are pressed into a whole through pressing technology.

[0060] It should be noted that, in this document, terms such as "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A laminated busbar for an anti-inrush current protection IGBT of a synchronous reluctance controller, comprising a fan cover (4), a first capacitor (5), a resistor (6), a single-arm bridge (7), an IGBT (8), a transformer (9), a contactor (13), a second capacitor (23), a grounding terminal (26), a circuit breaker (34) and a heat sink (35), characterized in that: The radiator (35) is mounted in a radiator fixing plate (3), the radiator fixing plate (3) is mounted on a base plate (2), and horizontal support frames (1) are provided on both sides of the bottom surface of the base plate (2). A terminal mounting plate (12) is provided at one end of the base plate (2), and a grounding terminal (26) is provided on the terminal mounting plate (12). The grounding terminal (26) is respectively provided with a positive connection terminal block (39), a negative connection terminal block (40), a connection copper bar (25), a W connection copper bar (29), a resistor connection copper bar (30), a first circuit breaker connection copper bar (31), and a second circuit breaker connection copper bar (32). The positive connection terminal block (39) and the negative connection terminal block (40) are respectively connected to the positive busbar (17) and the negative busbar (36); The positive busbar (17) and the negative busbar (36) are stacked together, and the surfaces of the positive busbar (17) and the negative busbar (36) are respectively evenly sprayed with an insulating resin coating; It also includes a rectifier bridge positive connection copper bar (11) connected to the positive busbar (17) and the negative busbar (36), a rectifier bridge negative connection copper bar (14), a rectifier bridge connection copper bar (16) connected to the positive busbar (17), and a T-shaped copper bar (15) connected to the single-arm bridge (7) and the contactor (13) respectively; It also includes a first capacitor positive and negative electrode connecting copper bar (20), wherein the first capacitor positive and negative electrode connecting copper bar (20) are respectively connected to the positive busbar (17) and the negative busbar (36), and the connecting copper bar (25) is connected to the first capacitor positive and negative electrode connecting copper bar (20), and the first capacitor (5) is provided with three groups; It also includes a grounding copper busbar (18) connected to the negative busbar (36), wherein the grounding copper busbar (18) is connected to the grounding terminal (26); It also includes a first IGBT connecting copper bar (21) and a second IGBT connecting copper bar (22) respectively connected to the second capacitor (23), wherein the connecting copper bar (25) is respectively connected to the first IGBT connecting copper bar (21) and the second IGBT connecting copper bar (22), and three second capacitors (23) are provided.

2. The laminated busbar for the IGBT of a synchronous reluctance controller against inrush current protection according to claim 1, characterized in that: The surfaces of the positive busbar (17) and the negative busbar (36) are respectively evenly sprayed with an insulating resin coating with a thickness of 3 mm. The insulating resin coating includes but is not limited to high-performance epoxy resin.

3. The laminated busbar for the IGBT of a synchronous reluctance controller against inrush current protection according to claim 1, characterized in that: The laminated busbar for the synchronous reluctance controller anti-inrush current protection IGBT further includes a positive busbar support column (37) and a negative busbar support column (38) respectively arranged at the same end of the positive busbar (17) and the negative busbar (36) and not in position; The positive busbar support column (37) and the negative busbar support column (38) vertically support and fix the positive busbar (17) and the negative busbar (36) above the IGBT (8).

4. The laminated busbar for the IGBT of a synchronous reluctance controller against inrush current according to any one of claims 1 to 3, characterized in that: The width dimensions of the positive busbar (17) and the negative busbar (36) are the same, and the length dimension of the positive busbar (17) is greater than the length dimension of the negative busbar (36); The thickness of the positive busbar (17) and the negative busbar (36) are the same.

5. The laminated busbar for the IGBT of the synchronous reluctance controller against inrush current protection according to claim 4, characterized in that: The laminated busbar for the synchronous reluctance controller anti-inrush current protection IGBT also includes a contactor bracket (10) for mounting the contactor (13), and a first circuit breaker control mounting plate support frame (19) and a second circuit breaker control mounting plate support frame (24) for mounting the circuit breaker (34); The contactor bracket (10), the first circuit breaker control mounting plate support frame (19), and the second circuit breaker control mounting plate support frame (24) are respectively arranged on the radiator fixing plate (3).

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