Coaxial shunt and current detection system

Abstract

A coaxial shunt provided by the present invention comprises an outer conductor, a resistor body, a central shaft conductor and an insulating filler, the outer conductor, the resistor body and the central shaft conductor are all cylindrical structures and are coaxially arranged from outside to inside, an insulating connecting piece is arranged between the outer conductor and the central shaft conductor, and the insulating filler is arranged between the outer conductor and the central shaft conductor. The insulating connecting piece is mechanically connected with the outer conductor and the central shaft conductor at the same time, and / or the central shaft conductor is flexibly and electrically connected with the resistor body. According to the coaxial shunt provided by the invention, the insulation connecting piece and / or the central shaft conductor are / is flexibly and electrically connected with the resistor body, so that the resistor body is ensured to be stable and reliable. The invention also provides a current detection system using the coaxial shunt.

Description

[Technical field]

[0001] The present invention relates to the technical field of high-frequency current detection, and in particular to a coaxial shunt and a current detection system. [Background technology]

[0002] A shunt is a resistor used to shunt current. According to Ohm's law, the voltage across a resistor is equal to the product of the current and the resistance. If the resistance value is known, the current value can be calculated by detecting the voltage across the resistor.

[0003] However, in the field of electronic measurement, it is often necessary to measure high-frequency (above 100MHz) current waveforms. If traditional resistance measurement is used, the resulting shunt will produce a large parasitic inductance, resulting in a large current measurement error. In the prior art, for example, Chinese patent CN118169447A discloses a coaxial shunt, in which current flows into the resistor through a first conductive rod, then flows in the opposite direction through a conductive sleeve, and flows out through a second conductive rod, that is, the current is turned back when flowing through the coaxial shunt, thereby offsetting the interference of the magnetic field.

[0004] Therefore, the prior art usually includes an outer conductor, a resistor body and a central axis conductor, and the central axis conductor is connected to the resistor body. During use, the central axis conductor needs to be fixed to the conductor in the circuit by welding or threaded connection, and it will inevitably be affected by external forces. The external force exerted on the central axis conductor will be directly transmitted to the resistor body, causing varying degrees of damage to the resistor body. Therefore, existing coaxial shunts have the problems of poor stability and short service life. When the user installs and fixes the coaxial shunt, since the central axis conductor is connected to the internal resistor body, the central axis conductor is affected by external forces, which will form a certain pulling force and torsion on the resistor body. Slight effects will change the resistance value of the resistor body, resulting in reduced measurement accuracy; in severe cases, the resistor body will be directly damaged, resulting in continued use. [Summary of the invention]

[0005] The present invention provides a coaxial shunt and a current detection system for solving the above-mentioned problem, so as to improve the stability of high-frequency current detection and prolong the service life of the coaxial shunt.

[0006] The present invention provides a coaxial shunt, comprising an outer conductor, a resistor, a central axis conductor and an insulating filler. A containing cavity is provided inside the outer conductor, and the resistor is accommodated in the containing cavity. The outer conductor, the resistor and the central axis conductor are all cylindrical structures, which are coaxially arranged from the outside to the inside. The central axis conductor passes through the outer conductor, and the two ends of the resistor are electrically connected to the outer conductor and the central axis conductor respectively. The insulating filler is arranged in the containing cavity and is used to fill the gap between the outer conductor, the resistor and the central axis conductor; an insulating connector is provided between the outer conductor and the central axis conductor, and the insulating connector is mechanically connected to the outer conductor and the central axis conductor at the same time, so as to fix the relative position of the central axis conductor and the outer conductor, and transmit the external force applied to the central axis conductor to the outer conductor; and / or the central axis conductor and the resistor are flexibly electrically connected to buffer the external force applied to the central axis conductor.

[0007] At the same time, the present invention provides a current detection system, including a detection device and a coaxial shunt, including an outer conductor, a resistor, a central axis conductor and an insulating filler, wherein a receiving cavity is provided inside the outer conductor, and the resistor is received in the receiving cavity, and the outer conductor, the resistor and the central axis conductor are all cylindrical structures, and are coaxially arranged from the outside to the inside, and the central axis conductor passes through the outer conductor, and the two ends of the resistor are electrically connected to the outer conductor and the central axis conductor respectively, and the insulating filler is arranged in the receiving cavity, and is used to fill the space between the outer conductor, the resistor and the central axis conductor. gap; an insulating connector is provided between the outer conductor and the central axis conductor, and the insulating connector is mechanically connected to the outer conductor and the central axis conductor at the same time, for fixing the relative positions of the central axis conductor and the outer conductor, and transmitting the external force applied to the central axis conductor to the outer conductor; and / or a flexible electrical connection between the central axis conductor and the resistor, for buffering the external force applied to the central axis conductor; the detection device is electrically connected to the outer conductor and the central axis conductor, for detecting the high-frequency current signal flowing through the outer conductor, the resistor and the central axis conductor.

[0008] Compared with the prior art, the coaxial shunt provided by the present invention provides the insulating connector between the central axis conductor and the outer conductor, and mechanically connects and fixes the relative positions of the outer conductor and the central axis conductor. When the coaxial shunt is used, the user will not damage the resistor disposed inside the outer conductor by pulling or twisting the central axis conductor during operation, thereby ensuring that the resistor is stable and reliable. And / or the central axis conductor and the resistor are connected by a flexible electrical connection to buffer the external force on the central axis conductor, thereby also ensuring that the resistor is stable and effective.

[0009] The current detection system using the coaxial shunt can also ensure the accuracy of detecting high-frequency current signals while extending the service life of the coaxial shunt, reducing the replacement frequency, and thus reducing the detection cost.

Brief Description of the Drawings

[0010] 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. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0011] Figure 1 It is a structural block diagram of the current detection system provided by the present application;

[0012] Figure 2 is a schematic diagram of the three-dimensional structure of the coaxial splitter provided in Example 1 of the present application;

[0013] Figure 3 is a three-dimensional structural exploded diagram of the coaxial splitter provided in Example 1 of the present application;

[0014] Figure 4 is a cross-sectional view of a coaxial splitter provided in Example 1 of the present application;

[0015] Figure 5 is a state diagram of the coaxial shunt provided in the first embodiment of the present application being used in the current detection system;

[0016] Figure 6 yes Figure 3 A schematic diagram of the three-dimensional structure of the insulating connector shown;

[0017] Figure 7 yes Figure 3 A schematic diagram of the three-dimensional structure of the central axis conductor shown;

[0018] Figure 8 is a cross-sectional view of a coaxial splitter provided in Example 2 of the present application;

[0019] Fig. 9 yes Figure 8 A schematic diagram of the three-dimensional structure of the insulating connector shown;

[0020] Fig.10 yes Figure 8 A schematic diagram of the three-dimensional structure of the central axis conductor shown;

[0021] Fig.11 is a cross-sectional view of the insulating connector of the coaxial shunt provided in Embodiment 3 of the present application;

[0022] Fig.12 is a cross-sectional view of the outer conductor of the coaxial shunt provided in Embodiment 3 of the present application;

[0023] Fig.13 is a schematic diagram of the three-dimensional structure of the coaxial splitter provided in the fourth embodiment of the present application;

[0024] Fig.14 is a schematic diagram of the three-dimensional structure of the coaxial splitter provided in Example 5 of the present application; and

[0025] Fig.15 This is a cross-sectional view of the coaxial splitter provided in Example 6 of the present application. [Specific implementation method]

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 The current detection system 100 provided by the present invention includes a coaxial shunt 10 and a detection device 30. The detection device 30 is electrically connected to the coaxial shunt 10 to detect and display the high-frequency current signal I flowing through the coaxial shunt 10. It should be noted that the detection device 30 is a computer, an oscilloscope or other terminal device that can be used to detect and display the current waveform, which is not limited here. The high-frequency current is mainly a current signal with a frequency above 100MHz. Of course, the current detection system 100 can also detect low-frequency signals. However, when measuring high-frequency signals, it can reduce the influence of parasitic inductance compared to ordinary shunts and improve detection accuracy.

[0028] Please continue reading Figure 2 , Figure 3 and Figure 4, are respectively a three-dimensional structural schematic diagram, an exploded diagram and a cross-sectional view of the coaxial shunt 10 provided in Example 1 of the present application. The coaxial shunt 10 comprises an outer conductor 1, a resistor 3, a central axis conductor 5, an insulating filler (not shown) and an insulating connector 7. A containing cavity 101 is provided inside the outer conductor 1, and the resistor 3 is accommodated in the containing cavity 101. The outer conductor 1, the resistor 3 and the central axis conductor 5 are all cylindrical structures, which are coaxially arranged from the outside to the inside. The central axis conductor 5 passes through the outer conductor 1, and the two ends of the resistor 3 are electrically connected to the outer conductor 1 and the central axis conductor 5 respectively. The central axis conductor 5 is not directly connected to the outer conductor 1, but is indirectly connected through the resistor 3. One end of the central axis conductor 5 extending out of the outer conductor 1 is used to connect to the outside to import or export the high-frequency current signal I.

[0029] The two ends of the resistor 3 are electrically connected to the outer conductor 1 and the center axis conductor 5, respectively. The center axis conductor 5 is connected to the outer conductor 1 through the resistor 3. When the high-frequency current signal I flows in from the center axis conductor 5, it flows through the resistor 3 and is then led out through the outer conductor 1. When the high-frequency current signal I flows through the center axis conductor 5 and the outer conductor 1, the influence of the magnetic field is eliminated due to the return flow, that is, the influence of parasitic inductance on the high-frequency current detection is eliminated. Of course, the high-frequency current signal I can also flow in through the outer conductor 1, and accordingly, flow through the resistor 3 and then flow out through the center axis conductor 5.

[0030] The outer conductor 1 and the center axis conductor 5 are both made of conductive materials, such as metal copper conductors, and the resistor 3 is made of a material with a clear resistance value and good stability, such as a carbon composite resistor, etc., which is not limited here. After the resistance value of the resistor 3 and the voltage between the center axis conductor 5 and the outer conductor 1 are determined, the high-frequency current signal I flowing through the coaxial shunt 10 can be simply calculated using Ohm's law.

[0031] The insulating filler is provided in the accommodating cavity 101, and is used to fill the gap between the outer conductor 1, the resistor 3 and the central axis conductor 5. Since the outer conductor 1 and the central axis conductor 5 are not directly connected, and the outer conductor 1, the resistor 3 and the central axis conductor 5 are coaxially arranged from the outside to the inside, there are a lot of gaps in the middle. By providing the insulating filler, the gap can be filled, so that the position between the outer conductor 1, the resistor 3 and the central axis conductor 5 is relatively stable. The insulating filler can be selected from existing insulating materials. In this embodiment, insulating glue is preferably used, which can not only be used for filling, but also can fix the relative positions of the outer conductor 1, the resistor 3 and the central axis conductor 5.

[0032] The insulating connector 7 is mechanically connected to the outer conductor 1 and the central axis conductor 5 at the same time, and is used to fix the relative position of the central axis conductor 5 and the outer conductor 1, and transmit the external force on the central axis conductor 5 to the outer conductor 1. The outer conductor 1 and the central axis conductor 5 are electrically connected through the resistor 3, and the central axis conductor 5 and the resistor 3 are usually fixed by welding, which makes it very easy to damage the resistor 3 during use. Through the insulating connector 7, although there is no direct contact connection between the outer conductor 1 and the central axis conductor 5, the relative position is fixed. When the coaxial shunt 10 is used, whether the central axis conductor 5 is pulled or rotated, the relative position of the outer conductor 1 and the central axis conductor 5 remains unchanged, so that the resistor 3 will not be affected by external forces, that is, it will not be affected by the pulling force or the torsion formed by the rotation of the central axis conductor 5, thereby improving the stability of the resistor 3 and extending the service life of the resistor 3.

[0033] Please continue reading Figure 5 , Figure 5 The coaxial shunt 10 provided in the first embodiment of the present invention is used in the current detection system 100. Taking the coaxial shunt 10 provided in the first embodiment as an example, the use of the current detection system 100 is described. The detection device 30 is electrically connected to the outer conductor 1 and the central axis conductor 5, and is used to detect the high-frequency current signal I flowing through the outer conductor 1, the resistor 3 and the central axis conductor 5. Figure 5As shown, the high-frequency current signal I comes from the double-sided PCB9, a through hole 901 is provided in the double-sided PCB9, the central axis conductor 5 passes through the double-sided PCB9 through the through hole 901, and cooperates with the nut 501 to fix the coaxial shunt 10 on the double-sided PCB9, the outer conductor 1 abuts against one side of the double-sided PCB9, a first conductive sheet 91 is provided at the abutting position, so that the outer conductor 1 is electrically connected to the double-sided PCB9, and the first conductive sheet 91 and the central axis conductor 5 are arranged at intervals, and the two are not fitted or connected; the nut 501 abuts against the other side of the double-sided PCB9, a second conductive sheet 93 is provided on the other side of the double-sided PCB9, and the nut 501 abuts against the second conductive sheet 93, so that the central axis conductor 5 is electrically connected to the second conductive sheet 93. The high-frequency current signal I comes from the double-sided PCB9, the first conductive sheet 91 and the second conductive sheet 93 are respectively the input and output ends of the high-frequency current signal I, and are respectively electrically connected to the outer conductor 1 and one end of the central axis conductor 5. The detection device 30 is electrically connected to the other end of the central axis conductor 5 and the outer conductor 1 to facilitate the detection of the high-frequency current signal I. It should be noted that, in addition to the nut 501 connected to the second conductive sheet 93 and the central axis conductor 5, a plurality of conductive nuts 501 may be provided to be connected to the outer conductor 1 and the first conductive sheet 91, so that the installation of the coaxial shunt 10 is more stable, and a conductive metal gasket may be provided between the outer conductor 1 and the first conductive sheet 91 to facilitate a more complete contact between the outer conductor 1 and the first conductive sheet 91, which will not be described in detail here.

[0034] In this embodiment, when installing the coaxial shunt 10, the central axis conductor 5 is subjected to both tension and torsion because the central axis conductor 5 needs to pass through the double-sided PCB 9 and is fixed with the nut 501. Since the insulating connector 7 is mechanically connected to the central axis conductor 5 and the outer conductor 1 at the same time, the tension and torsion on the central axis conductor 5 will be transmitted to the outer conductor 1, and the relative position between the outer conductor 1 and the central axis conductor 5 remains unchanged, so that the resistor 3 will not be affected by external forces.

[0035] It should be noted that the mechanical connection is different from the existing coaxial shunt 10 which only uses the insulating filler to fix the relative position of the outer conductor 1 and the central axis conductor 5. Instead, the mechanical connection is achieved by matching the mechanical structure of the insulating connector 7 with the structure of the outer conductor 1 and the central axis conductor 5 to fix the relative position of the outer conductor 1 and the central axis conductor 5, and can transmit the external force on the central axis conductor 5. In this embodiment, the design is mainly carried out in the form of mechanical structures engaging with each other. Of course, in other embodiments, other mechanical connection methods can also be used, as long as the position between the outer conductor 1 and the central axis conductor 5 is fixed and there is no direct electrical connection between them. When the outer conductor 1 and the central axis conductor 5 are mechanically connected and fixed, an insulating connector 7 including insulating material must be used, and other conductive material connectors cannot be used alone, otherwise the measurement structure will be seriously affected.

[0036] Of course, the structure of the insulating connector 7 can be varied. In order to ensure that the mechanical connection between the central axis conductor 5 and the outer conductor 1 and the insulating connector 7 is more stable and the force transmission is ensured, please continue to refer to Figure 6 and Figure 7 , is a schematic diagram of the three-dimensional structure of the insulating connector 7 and the central axis conductor 5 provided in Example 1.

[0037] The central axis conductor 5 is provided with a first boss 51, and the insulating connector 7 is provided with a base 71 and a first groove 73. The first groove 73 is arranged relative to the first boss 51 and is arranged on the side of the base 71 close to the resistor 3. In order to ensure that the central axis conductor 5 and the insulating connector 7 are fully engaged, the central axis conductor 5 is arranged by the first boss 51 and the first groove 73 to achieve an engagement connection with the insulating connector 7. Moreover, since the central axis conductor 5 is mainly affected by tension and torsion, the engagement of the first boss 51 and the first groove 73 can ensure that the insulating connector 7 can transmit the rotational torsion when the central axis conductor 5 rotates; the first groove 73 is arranged on the side of the base 71 close to the resistor 3, so that the base 71 and the first boss 51 cooperate to ensure that the insulating connector 7 can transmit the tension on the central axis conductor 5. The overall structure is simple and practical, easy to install, and does not increase the volume of the coaxial shunt 10.

[0038] In this embodiment, the central axis conductor 5 passes through the base 71, the structural shape of the first groove 73 matches the structural shape of the first boss 51, and the first boss 51 is received in the first groove 73 and fully fits with the base 71. Figure 6It can be seen that the base 71 in the insulating connector 7 provided in the first embodiment is a circular ring structure, the central axis conductor 5 is coaxially arranged with the base 71, the first boss 51 includes two symmetrically arranged semicircular ring structures and two recessed parts, and correspondingly, the structural shape of the first groove 73 is basically the same as the overall shape of the first boss 51, but there is a slight difference in size. The two are just matched, so that the first boss 51 is accommodated in the first groove 73. Of course, the gap between the first boss 51 and the first groove 73 can also be filled by adding insulating glue, so that the snap connection between the first boss 51 and the first groove 73 is more stable, ensuring that the torsion of the central axis conductor 5 can be effectively transmitted.

[0039] It should be noted that, in another embodiment, the structure of the first boss 51 can also be other shapes, and the structure and shape of the first groove 73 and the first boss 51 do not need to be completely consistent. It is only necessary for the first boss 51 to abut against the side walls of the first groove 73 on both sides of the rotation direction. This arrangement can ensure that the first boss 51 can cooperate with the first groove 73 to effectively transfer the torsion exerted on the center axis conductor 5. However, the first boss 51 must be connected to the base 71 through the first groove 73, otherwise the torsion cannot be transferred, and the center axis conductor 5 will still rotate relative to the outer conductor 1, causing damage to the resistor 3. For example, if the first boss 51 and the first groove 73 are both complete annular structures, then the first boss 51 and the base 71 are not connected by a snap fit.

[0040] You can continue to read Figure 8 , Fig. 9 and Fig.10 , respectively, are a cross-sectional view of the coaxial shunt 10, a schematic diagram of the three-dimensional structure of the insulating connector 7 and the center axis conductor 5 provided in the second embodiment of the present application. The difference between the second embodiment and the first embodiment is that the structure of the first boss 51 and the structure of the insulating connector 7 are different. Here, a special example is given, the first boss 51 is composed of a semicircular ring structure, and the insulating connector 7 is arranged on one side of the center axis conductor 5 and is arranged relative to the first boss 51. The insulating connector 7 is also provided with a base 71 and the first groove 73, but the center axis conductor 5 does not penetrate the base 71. The first groove 73 is still arranged relative to the first boss 51 and is arranged on the side of the base 71 close to the resistor 3. The overall structures of the two match, and can also effectively transmit the torque of the center axis conductor 5 during rotation. Compared with the first embodiment, the second embodiment reduces the use of materials and reduces the production cost. Users can choose according to actual needs, and no further restrictions are made here.

[0041] After the force on the central axis conductor 5 is transmitted to the insulating connector 7, it is necessary to consider how to transmit the force to the outer conductor 1 again. Figure 3 , Figure 4 and Figure 6 The outer conductor 1 is provided with a snap-fitting groove 11, and the insulating connector 7 is provided with a second boss 75. The second boss 75 is arranged opposite to the snap-fitting groove 11 and is arranged on a side of the base 71 away from the resistor 3. Figure 3 and Figure 4 It can be seen that the shape of the engaging groove 11 provided in the outer conductor 1 matches that of the second boss 75, and the two are fully fitted. When the insulating connector 7 transmits the rotational torque, the torque can be transmitted to the outer conductor 1 by the engaging connection between the second boss 75 and the engaging groove 11. Moreover, in this embodiment, since the second boss 75 is provided on the side of the base 71 away from the resistor 3, the overall area of ​​the second boss 75 and the engaging groove 11 is smaller than that of the base 71. Therefore, when the insulating connector 7 transmits the pulling force, the base 71 is fully fitted with the outer conductor 1, and the pulling force is transmitted to the outer conductor 1. It should be noted that in another embodiment, the second boss 75 can also be provided on the peripheral side of the base 71, and the mutual cooperation between the second boss 75 and the engaging groove 11 can also be realized, so as to realize the transmission of the force by the insulating connector 7.

[0042] Similarly, the second boss 75 must be engaged with the outer conductor 1 through the first groove 73, otherwise the torque cannot be transmitted, and the central axis conductor 5 will still rotate relative to the outer conductor 1, resulting in damage to the resistor 3. For example, if the second boss 75 and the engaging groove 11 are both complete annular structures, the second boss 75 and the outer conductor 1 are not engaged.

[0043] Also, see Fig.11 and Fig.12, are cross-sectional views of the insulating connector 7 and the outer conductor 1 in the coaxial shunt 10 provided in the third embodiment of the present application, respectively. The difference between the third embodiment and the first embodiment is that the structures of the outer conductor 1 and the insulating connector 7 are different. In the third embodiment, the outer conductor 1 is provided with a ridge 13, and the insulating connector 7 is provided with a second groove 77, and the second groove 77 is arranged relative to the ridge 13. The second groove 77 is arranged on the base 71 to cooperate with the ridge 13, so that the base 71 and the ridge 13 are fully fitted, and the transmission of tension and torsion can also be achieved. Of course, the structure of the second groove 77 and the second ridge 13 is not further limited here. In order to fit more fully and better realize the transmission of force, a plurality of second grooves 77 can be evenly arranged along the circumference on the base 71, and the ridge 13 can also be arranged accordingly.

[0044] In the first, second and third embodiments, the central axis conductor 5 is a columnar structure, and the central axis conductor 5 extending out of the outer conductor 1 is provided with a thread on one side, which cooperates with the nut 501 to fix the position, that is, Figure 5 As shown, the coaxial shunt 10 is conveniently fixed on the double-sided PCB 9 for use. This arrangement is simple and convenient, and the coaxial shunt 10 can be disassembled and installed at any time; and the central axis conductor 5 and the second conductive sheet 93, and the outer conductor 1 and the first conductive sheet 91 are firmly connected and are not easily disturbed by the surrounding environment.

[0045] Please continue reading Fig.13, is a three-dimensional structural diagram of the coaxial shunt 10 provided in the fourth embodiment of the present application. The main difference between the fourth embodiment and the above embodiments is that, in the above embodiments, the central axis conductor 5 is connected to the double-sided PCB 9 by a columnar structure threaded connection to measure the high-frequency current signal I; while in the fourth embodiment, the central axis conductor 5 is provided with a first conductive rod 33, and the outer conductor 1 is provided with a second conductive rod 35, the first conductive rod 33 is provided on the side where the central axis conductor 5 extends out of the outer conductor 1, and the second conductive rod 35 is spaced apart from the first conductive rod 33 and is provided on the same side of the outer conductor 1, and both are slender conductors. The first conductive rod 33 and the second conductive rod 35 can also be used to measure the high-frequency current signal I, and the first conductive rod 33 and the second conductive rod 35 need to be fixed to the input and output ports of the high-frequency current signal I by welding. The setting method of the fourth embodiment is applicable to a wider range of scenarios, and can also be measured without the cooperation of the double-sided PCB 9. Similarly, the insulating connector 7 also needs to be provided in the fourth embodiment. Since the first conductive rod 33 needs to be installed and fixed, it will also be affected by the tension and rotational torque. The insulating connector 7 can also solve the problem of damage to the resistor 3.

[0046] In order to ensure that the resistor 3 is not affected by the central axis conductor 5, the central axis conductor 5 and the resistor 3 may be connected in a flexible electrical connection. Fig.14 , is a cross-sectional view of the coaxial shunt 10 provided in the fifth embodiment of the present application. The central axis conductor 5 includes a first rod 57 and a second rod 59, the first rod 57 is mechanically connected to the insulating connector 7, and one end of the first rod 57 extends out of the outer conductor 1; the second rod 59 penetrates the resistor 3, is flexibly electrically connected to the first rod 57, and is electrically connected to the resistor 3. Compared with the integrated arrangement of the central axis conductor 5 in other embodiments, the coaxial shunt 10 provided in the fifth embodiment can more easily realize the installation and engagement of the insulating connector 7 relative to the central axis conductor 5 and the outer conductor 1 by setting the central axis conductor 5 as the first rod 57 and the second rod 59 that can be installed separately. The installation of the first rod 57 and the second rod 59 can be carried out separately, and will not contact the resistor 3 multiple times during the installation process, thereby protecting the resistor 3 as much as possible.

[0047] It should be noted that the flexible electrical connection refers to the electrical connection between two conductive materials, but it is not a rigid connection, which directly conducts the force, but has a certain buffering effect. In this embodiment, it refers to the electrical connection between the first rod 57 and the second rod 59, but the physical connection is not fixed. The relative position between the first rod 57 and the second rod 59 can be moved, but it will not affect the state of their electrical connection. Through the flexible electrical connection between the first rod 57 and the second rod 59, the first rod 57, after being subjected to force, can be displaced to a certain extent relative to the second rod 59, and will not directly affect the resistor 3. Of course, the central axis conductor 5 can also be directly and flexibly electrically connected to the resistor 3. The central axis conductor 5 can be offset to a certain position relative to the resistor 3, but it will not affect the electrical connection with the resistor 3.

[0048] In the fifth embodiment, the first rod 57 is provided with a mounting groove 571, one end of the second rod 59 is arranged in the mounting groove 571, and the second rod 59 is connected to the resistor 3. The connection mode of the first rod 57 and the second rod 59 is equivalent to the connection mode of the plug and socket electrical connector. In this setting mode, the cross-sectional area of ​​the first rod 57 is larger than the cross-sectional area of ​​the second rod 59, and one end of the second rod 59 can be relatively offset relative to the first rod 57 in the mounting groove 571. That is, when the first rod 57 is subjected to tension or torsion, there will be no large force conduction between the first rod 57 and the second rod 59, and the second rod 59 is connected to the resistor 3 to realize the conduction of the high-frequency current signal I, but will not damage the resistor 3. The second rod 59 cooperates with the outer conductor 1, connects the measuring device, and measures and displays the high-frequency current signal I flowing through the coaxial shunt 10.

[0049] Also, see Fig.15 , is a cross-sectional view of the coaxial shunt 10 provided in the sixth embodiment of the present application. In the sixth embodiment, the first rod 57 and the second rod 59 are not directly physically connected, and a conductive connector 58 is provided between the two. The first rod 57 and the second rod 59 are flexibly electrically connected through the conductive connector 58. The purpose of protecting the resistor 3 can be achieved by flexibly electrically connecting the conductive connector 58 with the first rod 57 and / or the second rod 59. The connection scheme of the conductive connector 58 with the first rod 57 and the second rod 59 includes a variety of situations that can be selected. When the conductive connector 58 is flexibly electrically connected to the first rod 57, the resistor 3 can be connected to both the conductive connector 58 and the second rod 59; when the conductive connector 58 is flexibly electrically connected to the second rod 59, the resistor 3 can be connected to the second rod 59. No specific restrictions are made here.

[0050] In this embodiment, the conductive connector 58 is a conductive elastic metal, such as a conductive sheet or wire made of beryllium copper, phosphor copper, etc. The first rod 57 and the second rod 59 can be connected to the conductive connector 58 by welding or plugging. Since the conductive connector 58 is an elastic metal, it has a certain deformation ability. When the first rod 57 is affected by an external force and transmitted to the conductive connector 58, the corresponding external force will not be directly transmitted to the second rod 59, thereby protecting the resistor 3. Of course, in another embodiment, the two ends of the conductive connector 58 are connected to the first rod 57 and the second rod 59, and the resistor 3 is connected to the conductive connector 58, which can also play the role of protecting the resistor 3. In addition, in addition to being directly connected, the connection between the conductive connector 58 and the first rod 57 and the second rod 59 can also be connected in a plug and socket electrical connection mode. A variety of methods are used in combination to achieve protection of the resistor 3.

[0051] It should be noted here that the flexible electrical connection between the center axis conductor 58 and the resistor 3 can be used alone or in combination with the insulating connector 7. In the schemes of Example 5 and Example 6, the coaxial shunt 10 is a combination of the two schemes, which has the best protection effect on the resistor 3.

[0052] Compared with the prior art, the coaxial shunt 10 provided by the present invention is provided with the insulating connector 7, and the relative positions of the outer conductor 1 and the central axis conductor 5 are fixed by clamping at the same time. When the coaxial shunt 10 is used, the user will not damage the resistor 3 disposed inside the outer conductor 1 by pulling or twisting the central axis conductor 5 during operation, thereby ensuring that the resistor 3 is stable and reliable. And / or the central axis conductor 5 and the resistor 3 are connected by a flexible electrical connection, so as to buffer the external force on the central axis conductor 5, thereby also ensuring that the resistor 3 is stable and effective.

[0053] In addition, the insulating connector 7 has a simple overall structure, and fully utilizes the gap between the outer conductor 1 and the central axis conductor 5 without affecting the overall volume of the coaxial shunt 10. When the insulating connector 7 is fully fitted with the outer conductor 1 and the central axis conductor 5, the force transmission is achieved, thereby ensuring the safety and effectiveness of the resistor 3. The flexible electrical connection between the central axis conductor 5 and the resistor 3 does not increase the overall volume of the coaxial shunt 10, thereby ensuring the safety and reliability of the resistor 3.

[0054] The current detection system 100 using the coaxial shunt 10, due to the function of the insulating connector 7, ensures the accuracy of detecting the high-frequency current signal I while extending the service life of the product, reducing the replacement frequency of the coaxial shunt 10, thereby reducing the detection cost.

[0055] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A coaxial shunt for assisting in measuring a high-frequency current signal, comprising: An outer conductor, wherein a receiving cavity is provided inside the outer conductor; A resistor, the resistor being received in the accommodating cavity; The outer conductor, the resistor and the central axis conductor are all cylindrical structures and are coaxially arranged from the outside to the inside. The central axis conductor passes through the outer conductor, and the two ends of the resistor are electrically connected to the outer conductor and the central axis conductor respectively; and The insulating filler is arranged in the accommodating cavity and is used to fill the gap between the outer conductor, the resistor and the central axis conductor; characterized in that: An insulating connector is provided between the outer conductor and the central axis conductor, and the insulating connector is mechanically connected to the outer conductor and the central axis conductor at the same time, and is used to fix the relative position of the central axis conductor and the outer conductor, and transmit the external force on the central axis conductor to the outer conductor; And / or a flexible electrical connection between the central axis conductor and the resistor is used to buffer the external force applied to the central axis conductor.

2. The coaxial splitter according to claim 1, characterized in that: The central axis conductor is provided with a first boss, the insulating connector is provided with a base and a first groove, the first groove is arranged relative to the first boss and is arranged on a side of the base close to the resistor.

3. The coaxial splitter according to claim 2, characterized in that: The central axis conductor passes through the base, the structural shape of the first groove matches the structural shape of the first boss, and the first boss is received in the first groove.

4. The coaxial splitter according to claim 2, characterized in that: The outer conductor is provided with a clamping groove, and the insulating connector is provided with a second boss, which is arranged opposite to the clamping groove.

5. The coaxial splitter according to claim 2, characterized in that: The outer conductor is provided with a convex ridge, and the insulating connector is provided with a second groove, and the second groove is arranged relative to the convex ridge.

6. The coaxial splitter according to claim 1, characterized in that: The central axis conductor is a columnar structure, and a thread is provided on one side of the central axis conductor extending out of the outer conductor, and is used to be fixed in position in cooperation with a nut.

7. The coaxial splitter according to claim 1, characterized in that: The central axis conductor is provided with a first conductive rod, and the outer conductor is provided with a second conductive rod. The first conductive rod is provided on the side of the central axis conductor extending out of the outer conductor, and the second conductive rod and the first conductive rod are spaced apart and provided on the same side of the outer conductor, and both are elongated conductors.

8. The coaxial splitter according to claim 1, characterized in that: The central axis conductor comprises: a first rod, one end of which extends out of the outer conductor; and The second rod passes through the resistor and is flexibly and electrically connected to the first rod.

9. The coaxial splitter according to claim 8, characterized in that: The first rod is provided with a mounting groove, one end of the second rod is arranged in the mounting groove, and the second rod is electrically connected to the resistor; Or a conductive connecting member is provided between the first rod and the second rod, and the conductive connecting member is flexibly electrically connected to the first rod and / or the second rod.

10. A current detection system, characterized in that: include: Testing equipment; and According to the coaxial shunt as described in any one of claims 1 to claim 9, the detection device is electrically connected to the outer conductor and the central axis conductor, and is used to detect the high-frequency current signal flowing through the outer conductor, the resistor and the central axis conductor.

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