A coaxial shunt and high-power switch module current detection system

Abstract

The utility model provides a kind of coaxial shunt, including main body structure, electrically-conductive bolt and coaxial connection structure, the main body structure includes outer conductor, inner conductor and resistance body;The electrically-conductive bolt with the high-power switch module is detachably connected, the electrically-conductive bolt is fixed by abutting the inner conductor, the main body structure is fixed in the high-power switch module, receives the current from the high-power switch module, and sequentially passes to the inner conductor, the resistance body and the outer conductor;The coaxial connection structure with the main body structure and the electrically-conductive bolt is detachably connected.The coaxial shunt provided in the application is simple in structure, easy to install, and can effectively detect the current of the high-power switch module, improving the detection accuracy and reliability.The application also discloses a high-power switch module current detection system.

Description

[Technical Field]

[0001] This utility model relates to current detection equipment, specifically to a current detection system for a coaxial shunt and a high-power switching module. [Background Technology]

[0002] A coaxial shunt is an important device for current detection in high-power switching modules. Traditional coaxial shunts typically consist of an outer conductor, a resistive element, and a central shaft conductor. These components are cylindrical and coaxially arranged, with the central shaft conductor always being a solid cylindrical structure, as shown in CN119104766A. To improve detection accuracy, some designs employ special current paths that cancel out the magnetic fields generated when the current flows through the resistive element, central shaft conductor, and outer conductor, achieving a virtually inductive effect, as shown in CN118169447A.

[0003] However, existing coaxial shunts have some limitations. For example... Figure 1 As shown, the high-power switching module 1 refers to modules such as IGBTs / MOSFETs with switching currents of 100A or higher. Its outgoing electrode 13 is typically a copper plate with a hole. Inside the module housing 11, there is a non-removable embedded nut 17. During use, a bolt is used to tighten the copper busbar 7 of the power circuit to the electrode 13 of the high-power switching module 1 for testing. Because the embedded nut 17 is embedded inside the housing and cannot be tightened with external tools, most existing coaxial shunts 1 cannot be directly fixed to the high-power switching module 1. Typically, the copper busbar 7 of the current to be measured needs to be disconnected and inserted into the coaxial shunt 3. This method is not only inconvenient but also occupies valuable space.

[0004] Researchers have proposed various solutions for the construction and design of existing coaxial shunts. For example, some designs employ a stacked resistor structure, effectively extending the conductive length and thus increasing the resistance without changing the physical dimensions, such as CN119595954A. Another approach is to incorporate a low-pass filter module within the resistor to filter out leaked high-frequency radio frequency signals and improve the detection bandwidth, such as CN119355329A. Further research has focused on precisely controlling the resistor thickness, reducing it to the micrometer level, to achieve faster response times, such as CN114878887B.

[0005] Nevertheless, existing technologies still struggle to simultaneously address issues related to ease of installation, space utilization efficiency, and measurement accuracy. Particularly in high-power switching module applications, designing a coaxial shunt that can be directly mounted on the module while ensuring high-precision measurements remains a pressing technical challenge. [Utility Model Content]

[0006] To address the issue that existing coaxial shunts cannot be directly mounted on high-power switching modules, and to achieve a new coaxial shunt structure that can be directly mounted on power switching modules without interrupting copper busbars, is simple in structure and easy to install, and can measure the current waveform of high-power switching modules during operation, this utility model provides a new coaxial shunt structure that can be directly mounted on power switching modules.

[0007] The technical solution of this utility model is as follows: A coaxial shunt is provided, comprising a main structure, conductive bolts, and a coaxial connection structure. The main structure includes an outer conductor, an inner conductor, and a resistor. The outer conductor has a first end and a second end, and has an internal cavity. The inner conductor is spaced apart from the outer conductor. The outer conductor, the inner conductor, and the resistor are all cylindrical structures. The inner conductor and the resistor are housed within the cavity, near the second end, and form a central channel connecting the cavity. The two ends of the resistor are respectively connected to the outer conductor and the inner conductor. The conductive bolts are connected to the high-power switch. The modules are detachably connected. The conductive bolt is installed from the first end through the central channel toward the second end. By abutting against the inner conductor, the main structure is fixed to the high-power switch module. The conductive bolt is spaced apart from the outer conductor and the resistor, receives current from the high-power switch module, and transmits it sequentially to the inner conductor, the resistor, and the outer conductor. The coaxial connection structure is detachably connected to the main structure and the conductive bolt. After the conductive bolt installs the main structure to the high-power switch module, the coaxial connection structure is installed at the first end.

[0008] Furthermore, the coaxial connection structure includes a conductive outer shell, a conductive central body, and an insulating connector. The conductive outer shell is detachably connected to the outer conductor, and the conductive central body is coaxially spaced from the conductive outer shell. The conductive outer shell is mounted on the outer conductor, and the conductive central body abuts against the conductive bolt. The insulating connector is located between the conductive outer shell and the conductive central body, and relatively fixes the position of the conductive central body.

[0009] Furthermore, the conductive center body includes an elastic telescopic portion that elastically abuts against the conductive bolt.

[0010] Furthermore, the main structure also includes a cylindrical insulating support body, which is sandwiched between the outer conductor and the inner conductor and together with the inner conductor forms the central channel. The resistor is attached to the insulating support body and the periphery of the inner conductor, and one end of the resistor abuts against the second end of the outer conductor.

[0011] Furthermore, the outer conductor includes a main body and a stepped portion. The main body extends towards the cavity from the second end to form the stepped portion. A mounting groove is formed between the stepped portion and the main body. One end of the insulating support abuts against the stepped portion. A gap is formed between the resistor and the main body. One end of the resistor is located in the mounting groove and abuts against the stepped portion.

[0012] Furthermore, the insulating support is fixed to the inner conductor, the step portion, and the resistor with adhesive, and the resistor is fixed to the step portion and the inner conductor by welding.

[0013] Furthermore, the conductive bolt includes a threaded connection portion, a smooth portion, and a head; the threaded connection portion is provided with a thread adapted to the high-power switch module, the dimensions of the smooth portion and the threaded connection portion are smaller than the dimensions of the central channel, the head is provided with a groove on the side away from the smooth portion, and the dimensions of the head are larger than the dimensions of the central channel.

[0014] Furthermore, the inner conductor protrudes from the insulating support on the side near the central channel, and correspondingly, the stepped portion and the insulating support are coplanar on the side near the central channel.

[0015] This utility model also provides a high-power switching module current detection system, including a high-power switching module, an insulating gasket, a copper busbar, the coaxial shunt, and a detection device; the high-power switching module includes a module housing, electrodes, and a chip-embedded nut, the electrodes are disposed outside the module housing, the chip is disposed inside the module housing and electrically connected to the electrodes via leads, and the embedded nut is disposed inside the module housing relative to the electrodes; the insulating gasket is placed above the electrodes, and the copper busbar is placed above the insulating gasket;

[0016] The coaxial shunt includes a main structure, conductive bolts, and a coaxial connection structure. The main structure includes an outer conductor, an inner conductor, and a resistor. The outer conductor has a first end and a second end, and has an internal cavity. The inner conductor is spaced apart from the outer conductor. The outer conductor, the inner conductor, and the resistor are all cylindrical structures. The inner conductor and the resistor are housed in the cavity, near the second end, and form a central channel connecting the cavity. The two ends of the resistor are connected to the outer conductor and the inner conductor, respectively. The conductive bolt is detachably connected to the high-power switch module. The conductive bolt is installed from the first end through the central channel toward the second end. By abutting against the inner conductor, the main structure is fixed to the high-power switch module. The conductive bolt is spaced apart from the outer conductor and the resistor, receives current from the high-power switch module, and transmits it sequentially to the inner conductor, the resistor, and the outer conductor.

[0017] The coaxial connection structure is detachably connected to the main structure and the conductive bolt. After the conductive bolt installs the main structure to the high-power switching module, the coaxial connection structure is installed at the first end. The conductive bolt in the coaxial shunt is installed from the first end through the central channel toward the second end, passing through the copper busbar, the insulating gasket, the electrode, and the module housing, and is threadedly connected to the embedded nut. One end of the conductive bolt is electrically connected to the electrode and the embedded nut, and the other end of the conductive bolt is electrically connected to the inner conductor. The outer conductor is electrically connected to the copper busbar. The detection device is connected to the coaxial shunt through the coaxial connection structure to detect the current of the high-power switching module.

[0018] Compared with the prior art, the structural design of the coaxial shunt provided in this application has the following advantages:

[0019] 1. Low parasitic inductance current detection is achieved by coaxial arrangement of the outer conductor, the inner conductor and the resistive element.

[0020] 2. The design of the conductive bolt achieves both electrical connection and mechanical fixation.

[0021] 3. The design of the coaxial connection structure facilitates connection with external measuring equipment and improves the flexibility of use.

[0022] 4. The connection method between the resistor, the inner conductor, the outer conductor, and the insulating support ensures the insulation performance between the inner conductor and the outer conductor, while also ensuring good electrical connection and mechanical strength.

[0023] The advantages of the high-power switching module current detection system provided in this application are as follows:

[0024] 1. The copper busbar does not need to be broken; it can be directly installed using the space previously occupied by the fixing bolts. By detachably connecting the conductive bolts of the coaxial shunt to the embedded nut of the high-power switching module, direct installation of the coaxial shunt and the high-power switching module is achieved, avoiding the need to break the copper busbar to insert it into the coaxial shunt.

[0025] 2. Simple structure and easy installation. The coaxial shunt of this utility model has a compact main structure, including key components such as the outer conductor, the inner conductor, and the resistor. It can be quickly installed using the conductive bolts, greatly simplifying the installation process.

[0026] 3. It can measure the current waveform when the high-power switching module is working. The coaxial shunt of this utility model receives the current from the high-power switching module through the conductive bolt, and transmits it through the inner conductor, the resistive element and the outer conductor. With the coaxial connection structure, accurate measurement of the current waveform can be achieved. [Attached Image Description]

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0028] Figure 1 This is a connection diagram of a high-power switching module current detection system in the prior art;

[0029] Figure 2 This is a perspective view of the high-power switching module current detection system provided in this application;

[0030] Figure 3 This is a cross-sectional view of the high-power switching module current detection system provided in this application;

[0031] Figure 4 This is an exploded perspective view of the coaxial shunt provided in this application; and

[0032] Figure 5 This is a perspective view of the coaxial shunt installation provided in this application.

Detailed Implementation Methods

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] Please refer to the following: Figures 2 to 5 This application provides a high-power switching module current detection system 100, which includes a high-power switching module 1, a coaxial shunt 3, an insulating pad 5, a copper busbar 7, and a detection device (not shown). The high-power switching module 1 includes a module housing 11, electrodes 13, a chip 15, and an embedded nut 17. The electrodes 13 are located outside the module housing 11, and the chip 15 is located inside the module housing 11 and electrically connected to the electrodes 13 via leads 19. The embedded nut 17 is located inside the module housing 11 relative to the electrodes 13. The insulating pad 5 is placed above the electrodes 13, and the copper busbar 7 is placed above the insulating pad 5. It should be noted that the chip 15 generally includes an IGBT or MOSFET type chip, and the high-power switching module 1 is a prior art product; its specific structure is not limited here. The module housing 11, the electrode 13, the insulating gasket 5 and the copper busbar 7 are all provided with through holes to facilitate the installation of the coaxial shunt 3. The testing equipment is generally an oscilloscope or a similar testing equipment.

[0039] The coaxial shunt 3 includes a main structure 31, conductive bolts 33, and a coaxial connection structure 35. The main structure 31 includes an outer conductor 311, an inner conductor 313, and a resistor 315. The outer conductor 311 has a first end 301 and a second end 303, and has a cavity 305 inside. The inner conductor 313 is spaced apart from the outer conductor 311. The outer conductor 311, the inner conductor 313, and the resistor 315 are all cylindrical structures. The inner conductor 313 and the resistor 315 are housed in the cavity 305, close to the second end 303, and form a central channel 307 connecting the cavity 305. The two ends of the resistor 315 are connected to the outer conductor 311 and the inner conductor 313, respectively. The coaxial arrangement of the outer conductor 311, the inner conductor 313, and the resistor 315 enables current detection with low parasitic inductance.

[0040] The conductive bolt 33 is detachably connected to the high-power switch module 1. The conductive bolt 33 is installed from the first end 301 through the central channel 307 towards the second end 303, and fixes the main structure 31 to the high-power switch module 1 by abutting against the inner conductor 313. The conductive bolt 33 is spaced apart from the outer conductor 311 and the resistor 315, receiving current from the high-power switch module 1 and sequentially transmitting it to the inner conductor 313, the resistor 315, and the outer conductor 311. The coaxial connection structure 35 is detachably connected to the main structure 31 and the conductive bolt 33. After the conductive bolt 33 installs the main structure 31 to the high-power switch module 1, the coaxial connection structure 35 is installed at the first end 301. The conductive bolt 33 in the coaxial shunt 3 is installed from the first end 301 through the central channel 307 towards the second end 303, successively passing through the copper busbar 7, the insulating gasket 5, the electrode 13, and the module housing 11, and is threadedly connected to the embedded nut 17. One end of the conductive bolt 33 is electrically connected to the electrode 13 and the embedded nut 17, and the other end of the conductive bolt 33 is electrically connected to the inner conductor 313. The outer conductor 311 is electrically connected to the copper busbar 7. The detection device is connected to the coaxial shunt 3 through the coaxial connection structure 35 to detect the current of the high-power switching module 1.

[0041] It should be noted that the detachable connection described in this application refers to a configuration that has both connected and disconnected states and can be freely switched, such as threaded connection, tight fit connection, or elastic snap-fit ​​connection. The conductive bolt 33 is preferably detachably connected to the high-power switch module 1 via a threaded connection, matching the embedded nut 17; the coaxial connection structure 35 is detachably connected to the main structure 31 via threaded connection, tight fit connection, or elastic snap-fit ​​connection, etc., without specific limitations. The coaxial shunt 3 provided in this application is completely different from the existing integrated configuration, being detachably connected to the high-power switch module 1 via the conductive bolt 33. The detachable connection of the coaxial connection structure 35 to the main structure 31 and the conductive bolt 33 separates the traditional coaxial shunt 3 into three parts with a sequential installation order, enabling direct installation of the coaxial shunt 3 to the high-power switch module 1. This avoids the need to interrupt the copper busbar 7 to insert the coaxial shunt 3, fully utilizing the dual function of the conductive bolt 33 in both fastening and conductivity. Moreover, in order to facilitate the detachable connection of the conductive bolt 33, the inner conductor 313 is also designed as a cylindrical structure, with a central channel 307 forming inside that connects to the accommodating cavity 305, so as to facilitate the assembly and disassembly of the conductive bolt 33, breaking the conventional thinking of setting the inner conductor 313 as a cylindrical solid structure.

[0042] Furthermore, the "placement" mentioned in this application refers to the fact that the two components need to be stacked during installation, and there is no fixed connection. Of course, they can also be set up in a detachable connection manner as described above. Specifically, the insulating pad 5 is placed above the electrode 13, and the copper busbar 7 is placed above the insulating pad 5, with a clear vertical stacking relationship. Through the arrangement of the copper busbar 7 and the insulating pad 5, it is ensured that the output current of the high-power switching module 1 flows through the coaxial shunt 3 and then to the copper busbar 7, thereby completing the current sampling.

[0043] The coaxial connection structure 35 can be selected from existing BNC connectors or connectors including but not limited to SMA / SMB / N type. In this embodiment, the coaxial connection structure 35 includes a conductive shell 351, a conductive center body 353, and an insulating connector 355. The conductive shell 351 is detachably connected to the outer conductor 311, and the conductive center body 353 is coaxially spaced from the conductive shell 351. The conductive shell 351 is mounted on the outer conductor 311, and the conductive center body 353 abuts against the conductive bolt 33. The insulating connector 355 is disposed between the conductive shell 351 and the conductive center body 353, relatively fixing the position of the conductive center body 353. The coaxial connection structure 35 is mainly used for connection to the detection equipment. The conductive center body 353 and the conductive shell 351 are coaxially spaced through the insulating connector 355, and together with the main structure 31 and the conductive bolt 33, low parasitic inductance current detection is achieved.

[0044] In this embodiment, as Figure 3 As shown, the conductive outer shell 351 is embedded in the accommodating cavity 305 to achieve abutment connection with the outer conductor 311. The conductive outer shell 351 and the outer conductor 311 can be connected by a threaded connection, a tight fit, or an elastic connection. When the conductive outer shell 351 is embedded in the accommodating cavity 305, the conductive central body 353 abuts against the conductive bolt 33, thereby allowing the current to be measured to enter the detection device through the coaxial connection structure 35.

[0045] To ensure the stability of the connection between the conductive center body 353 and the conductive bolt 33, the conductive center body 353 further includes an elastic telescopic portion 3531 that elastically abuts against the conductive bolt 33. Specifically, the elastic telescopic portion 3531 in the conductive center body 353 extends outward relative to the interior of the conductive outer shell 351 by a certain length. When the conductive outer shell 351 is initially installed onto the outer conductor 311, the elastic telescopic portion 3531 first abuts against the conductive bolt 33. As the conductive outer shell 351 further enters the receiving cavity 305, the elastic telescopic portion 3531 is compressed and continues to abut against the conductive bolt 33. This configuration ensures that after the coaxial connection structure 35 is installed, there will be no gap between the conductive center body 353 and the conductive bolt 33. Moreover, long-term disassembly and reassembly of the coaxial connector will cause some wear to the conductive center body 353. The elastic telescopic part 3531 ensures that even if wear occurs, it will not affect the connection between the conductive center body 353 and the conductive bolt 33, thus improving the stability of the connection.

[0046] In this embodiment, the main structure 31 further includes a cylindrical insulating support 37, which is sandwiched between the outer conductor 311 and the inner conductor 313, and together with the inner conductor 313 forms the central channel 307. The resistor 315 is attached to the insulating support 37 and the periphery of the inner conductor 313, with one end abutting against the second end 303 of the outer conductor 311. By providing the insulating support 37, the main structure 31 ensures the insulation performance between the inner conductor 313 and the outer conductor 311, thereby ensuring a coaxial arrangement between the inner conductor 313, the resistor 315, and the outer conductor 311. Of course, in another embodiment, the insulating support 37 can also be configured like the insulating connector 355 in the coaxial connection structure 35, with the insulating support 37 positioned between the outer conductor 311 and the inner conductor 313 in the same horizontal direction, fixing the relative position of the inner conductor 313. One end of the resistor 315 abuts against the second end 303 of the outer conductor 311, and the other end of the resistor 315 is sandwiched between the inner conductor 313 and the insulating support 37. This also achieves insulation between the inner conductor 313 and the outer conductor 311, and ensures a coaxial arrangement between the inner conductor 313, the resistor 315, and the outer conductor 311. In this embodiment, the insulating support 37 is preferably sandwiched between the inner conductor 313 and the second end 303, which not only fixes the position of the inner conductor 313, but also effectively bears the pressure when the conductive bolt 33 is tightened during installation, and provides a certain degree of protection for the resistor 315. Since the resistor 315 is made of a thin sheet, the insulating support 37 can ensure that the resistor 315 will not be deformed under stress when the conductive bolt 33 installs the main structure 31 to the high-power switch module 1.

[0047] To further increase the stability and reliability of the main structure 31, the outer conductor 311 includes a main body 3111 and a stepped portion 3113. The main body 3111 extends towards the central channel 307 near the second end 303 to form the stepped portion 3113. A mounting groove 309 is formed between the stepped portion 3113 and the main body 3111. One end of the insulating support 37 abuts against the stepped portion 3113. A gap is formed between the resistor 315 and the main body 3111. One end of the resistor 315 is located in the mounting groove 309 and abuts against the stepped portion 3113. Unlike the simple design where the outer conductor 311 has a planar structure at the second end, the outer conductor 311, by setting the main body 3111 and the stepped portion 3113, and forming the mounting groove 309 that can accommodate the resistor 315, can effectively increase the thickness of the second end 303 to bear the fastening force of the conductive bolt 33, preventing the outer conductor from deforming; moreover, the resistor 315 can stably fit and conduct electricity with the stepped portion 3113, increasing the contact area, thereby effectively improving the stability and reliability of the coaxial shunt 3.

[0048] In this embodiment, the insulating support 37 is fixed with adhesive to the inner conductor 313, the step portion 3113 and the resistor 315, and the resistor 315 is welded to the step portion 3113 and the inner conductor 313. This ensures the connection stability between the various parts and allows the current of the high-power switch module 1 to flow smoothly from the conductive bolt 33 through the inner conductor 313, the resistor 315 and the outer conductor 311.

[0049] To ensure that the conductive bolt 33 can fix the main structure 31 while achieving conductivity, the conductive bolt 33 includes a threaded connection portion 331, a smooth portion 333, and a head 335. The threaded connection portion 331 has a thread adapted to the high-power switch module 1. The dimensions of the smooth portion 333 and the threaded connection portion 331 are smaller than the dimensions of the central channel 307. The head 335 has a groove 3301 on the side away from the smooth portion 333, and the dimensions of the head 335 are larger than the dimensions of the central channel 307. Because the dimensions of the threaded connection portion 331 and the smooth portion 333 are smaller than the dimensions of the central channel 307, the conductive bolt 33 can easily pass through the central channel 307 to achieve a threaded connection with the embedded nut 17. Moreover, the head 335 is larger than the dimensions of the central channel 307, and the head 335 can abut against the inner conductor 313. It should be noted that the groove 3301 can be a slotted, Phillips, or hexagonal type, whichever is compatible with the existing screwdriver 2, and is not limited here. The screwdriver 2 can engage the groove 3301 to control the rotation and tightening of the conductive bolt 33, thereby achieving a detachable connection between the conductive bolt 33 and the embedded nut 17; moreover, the conductive center body 353 of the coaxial connection structure 35 can also be embedded in the groove 3301 and abut against the head 335, thereby effectively defining the axial position of the conductive center body 353.

[0050] The inner conductor 313 protrudes from the insulating support 37 on the side near the central channel 307. Correspondingly, the stepped portion 3113 is coplanar with the insulating support 37 on the side near the central channel 307. In this configuration, the conductive bolt 33, limited by the size of the inner conductor 313, can pass smoothly through the central channel 307 while ensuring that the conductive bolt 33 is spaced apart from the insulating support 37 and the stepped portion. Furthermore, the inner conductor 313 and the head 335 make sufficient contact, and the outer conductor 311 makes sufficient contact with the copper busbar 7.

[0051] The specific steps of the high-power switching module current detection system 100 provided in this application are summarized as follows:

[0052] The high-power switching module 1 is provided, and the insulating pad 5 and the copper busbar 7 are placed above the electrode 13;

[0053] The coaxial shunt 3 is provided to press the main structure 31 onto the copper busbar 7, ensuring that the electrode 13, the insulating pad 5, and the through hole of the copper busbar 7 are placed correspondingly to the central channel 307;

[0054] With the threaded connection portion 331 of the conductive bolt 33 facing the main structure 31, it is placed from the first end 301 to the second end 303. The threaded connection portion 331 passes through the inner conductor 313, the insulating support 37, the stepped portion 3113, the copper busbar 7, the insulating gasket 5, the electrode 13 and the module housing 11 in sequence. Then, the conductive bolt 33 is tightened with a screwdriver 2 to connect and fix the conductive bolt 33 to the embedded nut 17.

[0055] After the conductive bolt 33 is installed in place, the head 335 abuts against the inner conductor 313, and the second end 303 abuts against the copper busbar 7. The conductive bolt 33 is not connected to the outer conductor 311, the insulating support 37, the resistor 315 and the copper busbar 7. The conductive bolt 33 is electrically connected to the embedded nut 17 and the electrode 13.

[0056] The coaxial connection structure 35 is installed to the first end 301, the conductive outer shell 351 is connected to the outer conductor 311, and the conductive center body 353 abuts against the head 335 of the conductive bolt 33.

[0057] The detection device is provided, and the detection device is connected to the coaxial connection structure 35 or connected to the coaxial connection structure 35 via a coaxial cable. After the high-power switch module current detection system 100 is installed, it can detect the current of the high-power switch module 1.

[0058] After the high-power switch module current detection system 100 provided in this application is installed, the direction of current flow during the specific detection process is explained. Here, taking the current flowing out of the electrode 13 from the high-power switch module 1 as an example, the direction of current flow is summarized as follows:

[0059] Current flows from electrode 13 into coaxial shunt 3, passes through threaded connection 331 and smoothing portion 333 to head 335; current flows through head 335, inner conductor 313, resistor 315, and stepped portion 3113 of outer conductor 311, and then flows out from copper busbar 7. Conductive center body 353 contacts head 335, conductive outer shell 351 is electrically connected to outer conductor 311, and detection device completes current signal output detection through coaxial connection structure 35.

[0060] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A coaxial shunt for current detection in a high-power switching module, characterized in that, include: The main structure includes: An outer conductor having a first end and a second end, and having an internal accommodating cavity; Inner conductor, wherein the inner conductor and the outer conductor are spaced apart; and The resistor has a cylindrical structure, wherein the outer conductor, the inner conductor, and the resistor are all cylindrical. The inner conductor and the resistor are housed in the accommodating cavity, near the second end, and form a central channel connecting the accommodating cavity. The two ends of the resistor are respectively connected to the outer conductor and the inner conductor. A conductive bolt, detachably connected to the high-power switch module, is installed from the first end through the central channel towards the second end. By abutting against the inner conductor, it fixes the main structure to the high-power switch module. The conductive bolt is spaced apart from the outer conductor and the resistor, receives current from the high-power switch module, and sequentially transmits it to the inner conductor, the resistor, and the outer conductor. A coaxial connection structure is provided, which is detachably connected to the main structure and the conductive bolt. After the conductive bolt installs the main structure to the high-power switch module, the coaxial connection structure is installed at the first end.

2. The coaxial shunt according to claim 1, characterized in that, The coaxial connection structure includes: A conductive housing, wherein the conductive housing is detachably connected to the outer conductor; A conductive center body, coaxially spaced from the conductive outer shell, the conductive outer shell being mounted on the outer conductor, and the conductive center body abutting against the conductive bolt; and An insulating connector is disposed between the conductive outer shell and the conductive center body, and the position of the conductive center body is relatively fixed.

3. The coaxial shunt according to claim 2, characterized in that, The conductive center body includes an elastic telescopic part that elastically abuts against the conductive bolt.

4. The coaxial shunt according to claim 1, characterized in that, The main structure also includes a cylindrical insulating support body, which is sandwiched between the outer conductor and the inner conductor and together with the inner conductor forms the central channel. The resistor is attached to the insulating support body and the periphery of the inner conductor, and one end of the resistor abuts against the second end of the outer conductor.

5. The coaxial shunt according to claim 4, characterized in that, The outer conductor, the outer conductor comprising: Main body; and The main body extends from the second end toward the central channel to form the stepped portion, and a mounting groove is formed between the stepped portion and the main body. The insulating support abuts against the stepped portion. A gap is formed between the resistor and the main body, and one end of the resistor is located in the mounting groove and abuts against the stepped portion.

6. The coaxial shunt according to claim 5, characterized in that, The insulating support is fixed to the inner conductor, the stepped portion, and the resistor with adhesive.

7. The coaxial shunt according to claim 5, characterized in that, The resistor is welded and fixed to the stepped portion and the inner conductor.

8. The coaxial shunt according to claim 4, characterized in that, The conductive bolt includes: The threaded connection part is provided with a thread adapted to the high-power switching module; The smooth portion and the threaded connection portion are smaller than the size of the central channel; and The head has a textured groove on the side away from the smooth part, and the size of the head is larger than the size of the central channel.

9. The coaxial shunt according to claim 8, characterized in that, The inner conductor protrudes from the insulating support on the side near the central channel. Correspondingly, the stepped portion and the insulating support are coplanar on the side near the central channel.

10. A high-power switching module current detection system, characterized in that, include: High-power switching modules, including: Module housing; Electrodes, the electrodes being disposed outside the module housing A chip, wherein the chip is disposed within the module housing and electrically connected to the electrodes via leads; and An embedded nut is disposed within the module housing relative to the electrode; an insulating gasket is placed above the electrode. Copper busbar, wherein the copper busbar is positioned above the insulating pad; As described in any one of claims 1 to 9, in the coaxial shunt, the conductive bolt is installed from the first end through the central channel toward the second end, successively passing through the copper busbar, the insulating gasket, the electrode, and the module housing, and is threadedly connected to the embedded nut. One end of the conductive bolt is electrically connected to the electrode and the embedded nut, and the other end of the conductive bolt is electrically connected to the inner conductor. The outer conductor is electrically connected to the copper busbar. The detection device is connected to the coaxial shunt via the coaxial connection structure to detect the current of the high-power switching module.

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