Coaxial shunt and high-power switch module current detection system

Abstract

The invention provides a coaxial shunt, which comprises a main body structure, a conductive bolt and a coaxial connection structure, and is characterized in that the main body structure comprises an outer conductor, an inner conductor and a resistor body; the conductive bolt is detachably connected with the high-power switch module, and the conductive bolt fixes the main body structure to the high-power switch module by abutting against the inner conductor, receives current from the high-power switch module and transmits the current to the inner conductor, the resistor body and the outer conductor in sequence; the coaxial connection structure is detachably connected with the main body structure and the conductive bolt. The coaxial shunt provided by the invention is simple in structure and convenient to install, can be effectively used for detecting the current of the high-power switch module, and improves the detection precision and reliability. The invention also discloses a high-power switch module current detection system.

Description

Technical field

[0001] The present invention relates to current detection equipment, in particular to a coaxial shunt and a high-power switch module current detection system. [Background Technology]

[0002] Coaxial shunts are essential devices for current sensing in high-power switching modules. Traditional coaxial shunts typically consist of an outer conductor, a resistor, and a central conductor. These components are cylindrical and coaxially arranged, with the central conductor being a solid cylindrical structure, as described in CN119104766A. To improve detection accuracy, some designs employ specialized current paths, such as those described in CN118169447A, where the magnetic fields generated by the current flowing through the resistor, central conductor, and outer conductor cancel each other out, achieving a virtually zero-inductive effect.

[0003] However, existing coaxial splitters have some limitations. Figure 1 As shown, a high-power switch module 1, such as an IGBT / MOSFET module with a switching current of 100A or more, typically has 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 and the electrode 13 of the high-power switch module 1 before testing can be performed. Because the embedded nut 17 is embedded in the housing and cannot be tightened with external tools, most existing coaxial shunts 1 cannot be directly fixed to the high-power switch module 1. Typically, the copper busbar 7 of the current to be measured must be disconnected and inserted into the coaxial shunt 3. This method is not only inconvenient but also takes up valuable space.

[0004] Researchers have proposed various approaches to the construction and design of existing coaxial shunts. For example, one design utilizes a stacked resistor structure, effectively extending the conductive length and thereby increasing the resistance value without changing the physical dimensions, as shown in CN119595954A. Another approach incorporates a low-pass filter module within the resistor to filter out leaked high-frequency RF signals and increase the detection bandwidth, as shown in CN119355329A. Other research, such as CN114878887B, has also achieved faster response times by precisely controlling the resistor thickness, reducing it to the micron level.

[0005] Despite this, existing technologies still struggle to simultaneously address multiple challenges, including ease of installation, space efficiency, and measurement accuracy. In particular, in high-power switching module applications, designing a coaxial shunt that can be directly fixed to the module while ensuring high-precision measurements remains a pressing technical challenge. [Summary of the invention]

[0006] In order to solve the problem that the existing coaxial shunt cannot be directly fixed on the high-power switch module, the present invention provides a coaxial shunt with a new structure that can be directly mounted on the power switch module, so as to achieve the effect of not needing to interrupt the copper busbar, having a simple structure and convenient installation, and being able to measure the current waveform of the high-power switch module when it is working.

[0007] The technical solution of the present invention is to provide a coaxial shunt, including a main structure, a conductive bolt and a coaxial connection structure, wherein 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 is provided with a receiving cavity therein, the inner conductor and the outer conductor are spaced apart, the outer conductor, the inner conductor and the resistor are all cylindrical structures, the inner conductor and the resistor are accommodated in the receiving cavity, close to the second end, and form a central channel communicating with the receiving cavity, the two ends of the resistor are respectively connected to the outer conductor and the inner conductor; the conductive bolt is connected to the high-power switch module The blocks are detachably connected, the conductive bolt passes through the central channel from the first end and is installed toward the second end, fixing the main structure to the high-power switch module by abutting the inner conductor, the conductive bolt is spaced apart from the outer conductor and the resistor, receives current from the high-power switch module, and transmits it to the inner conductor, the resistor and the outer conductor in sequence; the coaxial connection structure is detachably connected to the main structure and the conductive bolt, and 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 shell, a conductive center body and an insulating connector. The conductive shell is detachably connected to the outer conductor, the conductive center body and the conductive shell are coaxially spaced apart, the conductive shell is installed on the outer conductor, and the conductive center body is in contact with the conductive bolt; the insulating connector is arranged between the conductive shell and the conductive center body to relatively fix the position of the conductive center body.

[0009] Furthermore, the conductive central 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 clamped between the outer conductor and the inner conductor, and forms the central channel together with the inner conductor. The resistor is attached to the insulating support body and the surrounding side of the inner conductor, and one end abuts the second end of the outer conductor.

[0011] Furthermore, the outer conductor includes a main body and a step portion, the main body extends toward the side of the accommodating cavity near the second end to form the step portion, a mounting groove is formed between the step portion and the main body, one end of the insulating support body abuts the step portion, a gap is formed between the resistor body and the main body, and one end of the resistor body is arranged in the mounting groove and abuts the step portion.

[0012] Furthermore, the insulating support body is fixed to the inner conductor, the step portion and the resistor body by glue, and the resistor body 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 smooth portion and the threaded connection portion are smaller than the center channel size, the head is provided with a groove on the side away from the smooth portion, and the head size is larger than the center channel size.

[0014] Furthermore, the inner conductor is arranged to protrude relative to the insulating support body on a side close to the central channel, and correspondingly, the step portion and the insulating support body are arranged coplanarly on a side close to the central channel.

[0015] The present invention also provides a high-power switch module current detection system, comprising a high-power switch module, an insulating gasket, a copper busbar, the coaxial shunt, and a detection device; the high-power switch module comprises a module housing, an electrode, and a chip embedded nut, wherein the electrode is disposed outside the module housing, the chip is disposed inside the module housing and is electrically connected to the electrode via a lead, and the embedded nut is disposed inside the module housing relative to the electrode; the insulating gasket is placed above the electrode, and the copper busbar is placed above the insulating gasket;

[0016] The coaxial shunt comprises a main body structure, a conductive bolt and a coaxial connection structure, wherein the main body structure comprises an outer conductor, an inner conductor and a resistor; the outer conductor has a first end and a second end and is provided with a receiving cavity therein, the inner conductor and the outer conductor are spaced apart, the outer conductor, the inner conductor and the resistor are all cylindrical structures, the inner conductor and the resistor are accommodated in the receiving cavity, close to the second end, and form a central channel communicating with the receiving cavity, the two ends of the resistor are respectively connected to the outer conductor and the inner conductor; 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, and fixes the main body structure to the high-power switch module by abutting against the inner conductor, the conductive bolt is spaced apart from the outer conductor and the resistor, receives current from the high-power switch module, and transmits it to the inner conductor, the resistor and the outer conductor in sequence;

[0017] The coaxial connection structure is detachably connected to the main structure and the conductive bolt. After the main structure is mounted to the high-power switch module by the conductive bolt, 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, 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, the other end of the conductive bolt is electrically connected to the inner conductor, and 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 switch module.

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

[0019] 1. By coaxially arranging the outer conductor, the inner conductor, and the resistor, current detection with low parasitic inductance is achieved.

[0020] 2. The design of the conductive bolt not only realizes electrical connection, but also plays a role of mechanical fixation.

[0021] 3. The design of the coaxial connection structure facilitates connection with external measuring equipment, thereby improving flexibility of use.

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

[0023] The beneficial effects of the high-power switch module current detection system provided by this application are:

[0024] 1. The copper busbar does not need to be broken, and can be directly installed using the space originally used for fixing bolts. By detachably connecting the conductive bolts of the coaxial shunt to the embedded nuts of the high-power switch module, the coaxial shunt and the high-power switch module can be directly installed, avoiding the need to break the copper busbar to insert the coaxial shunt.

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

[0026] 3. The coaxial shunt of the present invention can measure the current waveform of the high-power switch module during operation. The current from the high-power switch module is received by the coaxial shunt through the conductive bolt and transmitted through the inner conductor, the resistor, and the outer conductor. Combined with the coaxial connection structure, the current waveform can be accurately measured.

Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

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

[0029] Figure 2 This is a three-dimensional diagram of the high-power switch module current detection system provided by this application;

[0030] Figure 3 This is a cross-sectional view of the high-power switch module current detection system provided by the present application;

[0031] Figure 4 is a three-dimensional exploded schematic diagram of the coaxial splitter provided by the present application; and

[0032] Figure 5 This is a perspective view of the installation of the coaxial splitter provided by this application. [Specific implementation method]

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0036] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Please refer to Figures 2 to 5 The present application provides a high-power switch module current detection system 100, which includes a high-power switch module 1, a coaxial shunt 3, an insulating gasket 5, a copper busbar 7 and a detection device (not shown). The high-power switch module 1 includes a module housing 11, an electrode 13, a chip 15 and an embedded nut 17. The electrode 13 is arranged outside the module housing 11, and the chip 15 is arranged inside the module housing 11 and is electrically connected to the electrode 13 through a lead 19. The embedded nut 17 is arranged in the module housing 11 relative to the electrode 13. The insulating gasket 5 is placed above the electrode 13, and the copper busbar 7 is placed above the insulating gasket 5. It should be noted that the chip 15 generally includes an IGBT or MOSFET type chip, and the high-power switch modules 1 are all existing products, and the 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 detection device is generally an oscilloscope or similar detection equipment.

[0039] The coaxial shunt 3 includes a main structure 31, a conductive bolt 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 is provided with a housing cavity 305. 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 housing cavity 305, near the second end 303, and form a central channel 307 connecting the housing cavity 305. The two ends of the resistor 315 are respectively connected to the outer conductor 311 and the inner conductor 313. The coaxial arrangement of the outer conductor 311, the inner conductor 313, and the resistor 315 achieves current detection with low parasitic inductance.

[0040] The conductive bolt 33 is detachably connected to the high-power switch module 1. It extends from the first end 301 through the central channel 307 toward the second end 303, abutting the inner conductor 313 to secure the main structure 31 to the high-power switch module 1. 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 transferring 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 secures 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 toward the second end 303, sequentially 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 via the coaxial connection structure 35 to detect the current of the high-power switch module 1.

[0041] It should be noted that the detachable connection described in this application refers to a setting method that has two states, connected and separated, and can be freely switched, such as threaded connection, tight fit connection or elastic snap connection. The conductive bolt 33 is preferably detachably connected to the high-power switch module 1 by a threaded connection, which matches the embedded nut 17; the coaxial connection structure 35 is detachably connected to the main structure 31 in a manner including threaded connection, tight fit connection or elastic snap connection, etc., which are not specifically limited here. The coaxial shunt 3 provided in this application is completely different from the existing integrated setting scheme. It is detachably connected to the high-power switch module 1 through the conductive bolt 33. The detachable connection method of the coaxial connection structure 35 with the main structure 31 and the conductive bolt 33 separates the traditional coaxial shunt 3 into three parts, and has a sequential installation order, thereby realizing the direct installation of the coaxial shunt 3 and the high-power switch module 1, avoiding the problem of needing to break the copper bus 7 to insert the coaxial shunt 3, and making full use of the characteristics of the conductive bolt 33 that has both fastening function and conductive function. Moreover, in order to cooperate with the detachable connection of the conductive bolt 33, the inner conductor 313 is also set to a cylindrical structure, and a central channel 307 connected to the accommodating cavity 305 is formed inside to facilitate the disassembly and assembly of the conductive bolt 33, breaking the inherent idea of ​​setting the inner conductor 313 as a cylindrical solid structure.

[0042] In addition, the term "placed" as used herein means that the two need to be stacked during installation, without a fixed connection relationship. Of course, they can also be arranged in a detachable connection manner. Among them, the insulating spacer 5 is placed above the electrode 13, and the copper busbar 7 is placed above the insulating spacer 5, with a clear upper and lower stacking relationship. The arrangement of the copper busbar 7 and the insulating spacer 5 ensures that the output current of the high-power switch module 1 will flow 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 an existing BNC connector or a connector including but not limited to an 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. The conductive center body 353 and the conductive shell 351 are coaxially spaced apart. The conductive shell 351 is mounted on the outer conductor 311, and the conductive center body 353 abuts the conductive bolt 33. The insulating connector 355 is disposed between the conductive shell 351 and the conductive center body 353 to relatively fix the position of the conductive center body 353. The coaxial connection structure 35 is primarily used for connection to the detection equipment. The conductive center body 353 and the conductive shell 351 are coaxially spaced apart via the insulating connector 355, and cooperate with the main structure 31 and the conductive bolt 33 to achieve current detection with low parasitic inductance.

[0044] In this embodiment, if Figure 3 As shown, the conductive housing 351 is embedded in the accommodating cavity 305, achieving abutment connection with the outer conductor 311. The abutment between the conductive housing 351 and the outer conductor 311 can be achieved through a threaded connection, a tight fit, or an elastic connection. When the conductive housing 351 is embedded in the accommodating cavity 305, the conductive center body 353 abuts 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 core 353 and the conductive bolt 33, the conductive core 353 also includes an elastically retractable portion 3531 that elastically abuts the conductive bolt 33. Specifically, the elastically retractable portion 3531 in the conductive core 353 extends outward by a certain length relative to the interior of the conductive housing 351. When the conductive housing 351 is initially installed on the outer conductor 311, the elastically retractable portion 3531 initially abuts the conductive bolt 33. As the conductive housing 351 further enters the accommodating cavity 305, the elastically retractable portion 3531 is compressed and continues to abut the conductive bolt 33. This arrangement can ensure 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; and long-term disassembly and assembly of the coaxial connector will cause partial wear of the conductive center body 353. The arrangement of the elastic telescopic part 3531 can ensure that even if it is worn, it will not affect the connection between the conductive center body 353 and the conductive bolt 33, thereby improving the stability of the connection.

[0046] In this embodiment, the main structure 31 further includes a cylindrical insulating support 37, which is interposed 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 circumference of the inner conductor 313, with one end abutting the second end 303 of the outer conductor 311. The insulating support 37 ensures insulation between the inner conductor 313 and the outer conductor 311, 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 similarly to the insulating connector 355 in the coaxial connection structure 35. The insulating support 37 is positioned horizontally between the outer conductor 311 and the inner conductor 313 to secure the relative position of the inner conductor 313. One end of the resistor 315 abuts 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 similarly achieves insulation between the inner conductor 313 and the outer conductor 311, while ensuring 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. This not only secures the position of the inner conductor 313, but also effectively absorbs the pressure during installation and tightening of the conductive bolt 33, and provides a certain degree of protection for the resistor 315. Since the resistor 315 is made of a relatively thin soft film, when the conductive bolts 33 are used to mount the main structure 31 to the high-power switch module 1 , the insulating support 37 can ensure that the resistor 315 will not be deformed by force.

[0047] In order to further increase the stability and reliability of the main structure 31, the outer conductor 311 includes a main body 3111 and a step portion 3113. The main body 3111 extends toward the side of the center channel 307 near the second end 303 to form the step portion 3113. A mounting groove 309 is formed between the step portion 3113 and the main body 3111. One end of the insulating support body 37 abuts the step portion 3113. A gap is formed between the resistor body 315 and the main body 3111. One end of the resistor body 315 is arranged in the mounting groove 309 and abuts the step portion 3113. Different from the simple design of the outer conductor 311 having a planar structure at the second end, the outer conductor 311 is provided with the main body 3111 and the step portion 3113, and forms the installation groove 309 for accommodating the installation of the resistor 315, which can effectively increase the thickness of the second end 303 to bear the tightening force of the conductive bolt 33 and prevent the outer conductor from deformation; and the resistor 315 can stably fit with the step portion 3113 for conductivity, increase the contact area, thereby effectively improving the stability and reliability of the coaxial shunt 3.

[0048] In this embodiment, the insulating support body 37 is fixed to the inner conductor 313, the step portion 3113 and the resistor 315 by glue, and the resistor 315 is fixed to the step portion 3113 and the inner conductor 313 by welding, thereby ensuring the connection stability between the various parts and enabling 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 in sequence.

[0049] To ensure that the conductive bolt 33 secures the main structure 31 while also providing electrical conductivity, it includes a threaded portion 331, a smooth portion 333, and a head 335. The threaded portion 331 is threaded to mate with the high-power switch module 1. The smooth portion 333 and the threaded portion 331 are smaller than the central channel 307. The head 335 is provided with a groove 3301 on the side away from the smooth portion 333, and the head 335 is larger than the central channel 307. Because the threaded portion 331 and the smooth portion 333 are smaller than the central channel 307, the conductive bolt 33 can easily penetrate the central channel 307 and achieve a threaded connection with the embedded nut 17. Furthermore, the head 335 is larger than the central channel 307, allowing it to abut against the inner conductor 313. It should be noted that the groove 3301 can be a "slotted," "cross," or "hexagonal" groove structure, and 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 passage 307. Correspondingly, the step 3113 is coplanar with the insulating support 37 on the side near the central passage 307. With this arrangement, the conductive bolt 33, limited by the size of the inner conductor 313, can smoothly pass through the central passage 307. This ensures that the conductive bolt 33 is spaced apart from the insulating support 37 and the step, and that the inner conductor 313 and the head 335 are in sufficient contact, and the outer conductor 311 and the copper busbar 7 are in sufficient contact.

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

[0052] Provide the high-power switch module 1, and place the insulating gasket 5 and the copper busbar 7 above the electrode 13;

[0053] Provide the coaxial shunt 3 and press the main structure 31 onto the copper busbar 7 to ensure that the electrodes 13, the insulating gasket 5, and the through holes of the copper busbar 7 are positioned corresponding to the central channel 307;

[0054] The threaded connection portion 331 of the conductive bolt 33 is positioned toward the main structure 31, and is positioned from the first end 301 toward the second end 303. The threaded connection portion 331 sequentially passes through the inner conductor 313, the insulating support 37, the step portion 3113, the copper busbar 7, the insulating gasket 5, the electrode 13, and the module housing 11. Then, the conductive bolt 33 is tightened with a screwdriver 2 to securely connect 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 separated from 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 mounted on the first end 301 , the conductive shell 351 is connected to the outer conductor 311 , and the conductive center body 353 is in contact with 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 through a coaxial cable. The high-power switch module current detection system 100 is installed and 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 current flow direction during the specific detection process is explained. Here, taking the current of the high-power switch module 1 flowing out from the electrode 13 as an example, the current flow direction is summarized as follows:

[0059] Current flows from the electrode 13 into the coaxial shunt 3, passes through the threaded connection 331 and the smooth portion 333, and reaches the head 335. The current then flows through the head 335, the inner conductor 313, the resistor 315, and the stepped portion 3113 of the outer conductor 311, before exiting the copper busbar 7. The conductive center body 353 contacts the head 335, and the conductive housing 351 is electrically connected to the outer conductor 311. The detection device performs output detection of the current signal through the coaxial connection structure 35.

[0060] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A coaxial shunt for current detection of a high-power switch module, characterized in that: include: The main structure comprises: An outer conductor having a first end and a second end and an inner receiving cavity; an inner conductor, the inner conductor being spaced apart from the outer conductor; and a resistor, wherein the outer conductor, the inner conductor, and the resistor are all cylindrical structures, the inner conductor and the resistor are accommodated in the accommodating cavity, close to the second end, and form a central channel communicating with the accommodating cavity, and the two ends of the resistor are respectively connected to the outer conductor and the inner conductor; a conductive bolt, the conductive bolt being detachably connected to the high-power switch module, the conductive bolt being installed from the first end through the central channel toward the second end, and abutting against the inner conductor to fix the main structure to the high-power switch module, the conductive bolt being spaced apart from the outer conductor and the resistor, receiving current from the high-power switch module and transferring it sequentially to the inner conductor, the resistor, and the outer conductor; and A 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.

2. The coaxial splitter according to claim 1, characterized in that The coaxial connection structure includes: a conductive shell, wherein the conductive shell is detachably connected to the outer conductor; a conductive central body, the conductive central body and the conductive shell being coaxially spaced apart, the conductive shell being mounted on the outer conductor, the conductive central body being in contact with the conductive bolt; and An insulating connector is provided between the conductive shell and the conductive central body to relatively fix the position of the conductive central body.

3. The coaxial splitter according to claim 2, characterized in that: The conductive central body includes an elastic telescopic portion elastically abutting against the conductive bolt.

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

5. The coaxial splitter according to claim 4, characterized in that: The outer conductor comprises: the main body; and A step portion is formed, wherein the main body extends toward one side of the central channel near the second end, a mounting groove is formed between the step portion and the main body, and the insulating support body abuts the step portion; a gap is formed between the resistor body and the main body, and one end of the resistor body is arranged in the mounting groove and abuts the step portion.

6. The coaxial splitter according to claim 5, characterized in that: The insulating support body is fixed to the inner conductor, the step portion and the resistor by glue.

7. The coaxial splitter according to claim 5, characterized in that: The resistor is fixed to the step portion and the inner conductor by welding.

8. The coaxial splitter according to claim 4, characterized in that: The conductive bolt comprises: A threaded connection portion, provided with threads adapted to the high-power switch module; a smooth portion, wherein the dimensions of the smooth portion and the threaded connection portion are smaller than the dimension of the central passage; and A head portion is provided with a groove on a side of the head portion away from the smooth portion, and a size of the head portion is larger than a size of the central channel.

9. The coaxial splitter according to claim 8, characterized in that: The inner conductor is arranged to protrude relative to the insulating support body on a side close to the central channel. Correspondingly, the step portion and the insulating support body are arranged coplanarly on a side close to the central channel.

10. A high-power switch module current detection system, characterized in that: include: High-power switch module, including: module housing; Electrode, the electrode is arranged outside the module shell a chip, the chip being disposed in the module housing and electrically connected to the electrodes via leads; and an embedded nut, the embedded nut being arranged in the module housing relative to the electrode; an insulating gasket, the insulating gasket being placed above the electrode; a copper busbar, the copper busbar being placed above the insulating spacer; The coaxial shunt according to any one of claims 1 to 9, wherein the conductive bolt in the coaxial shunt 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, the other end of the conductive bolt is electrically connected to the inner conductor, and the outer conductor is electrically connected to the copper busbar; and A detection device is connected to the coaxial shunt through the coaxial connection structure to detect the current of the high-power switch module.

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