Portable multifunctional dummy load resistor for pulse source debugging

Abstract

The invention discloses a portable multifunctional dummy load resistor for pulse source debugging, and solves the problems that the resistance value of an existing resistive dummy load is unstable, or the rated power is low, and the large current impact stability is poor. The bottom end of the insulation outer cylinder is closed, the top of the insulation outer cylinder is covered with the grounding metal ring, the insulation inner cylinder is arranged in the insulation outer cylinder, the N resistor assemblies are arranged in the insulation outer cylinder and distributed around the insulation inner cylinder, and the high-voltage cable plug connector and the coil assembly are arranged on the top of the grounding metal ring. N > = 3; the device is compact in structure and flexible to move, can simultaneously realize three functions of dummy load, voltage measurement and current measurement, is suitable for debugging hundreds of kV pulse sources, and is convenient to carry.

Description

Technical Field

[0001] This invention relates to resistive dummy loads, and more specifically to a portable, multifunctional dummy load resistor for pulse source debugging. Background Technology

[0002] In the development and debugging of pulse sources, resistive dummy loads are often used to simulate real loads (such as high- and low-impedance vacuum X-ray tubes). Because pulse sources have high output voltages (hundreds of thousands of V), large currents (thousands of A), and narrow pulse widths (tens of ns), the resistive load must have high withstand voltage, be able to withstand high-power pulse impacts, and be purely resistive, thereby reducing the influence of resistance and inductance on the dummy load. Electrolyte solutions (or water loads) are generally used as dummy load resistors, capable of withstanding high power, but their resistance is affected by factors such as temperature and the chemical reaction between the electrolyte and the metal electrodes, resulting in unstable resistance. Oxide film resistors have stable resistance and high-frequency non-inductive characteristics, but their rated power is low, and their stability under high-current impacts is poor, making them unsuitable for debugging hundreds of kV pulse sources. Summary of the Invention

[0003] To address the technical problems of existing resistive dummy loads having unstable resistance values, low rated power, poor stability under high current surges, and the inability to simultaneously perform dummy load, voltage measurement, and current measurement functions, thus failing to meet the debugging requirements of hundreds of kV pulse sources, this invention provides a portable multifunctional dummy load resistor for pulse source debugging.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a portable multifunctional dummy load resistor for pulse source debugging, characterized in that it includes an insulating outer cylinder with a closed bottom, a grounding metal ring covering the top of the insulating outer cylinder, an insulating inner cylinder disposed inside the insulating outer cylinder, N resistor assemblies disposed inside the insulating outer cylinder and distributed around the insulating inner cylinder, a high-voltage cable connector disposed on the top of the grounding metal ring, and a coil assembly; N≥3; The grounding metal ring is provided with M first signal lead-out holes, where M ≥ N; The top of the insulating inner cylinder is connected to the grounding metal ring, and its inner hole corresponds to the middle hole of the grounding metal ring. A high-voltage shielding plate is provided at its bottom, and its inner hole is used to insert the high-voltage end of the high-voltage cable for electrical connection with the high-voltage shielding plate. The resistor assembly is supported between the grounding metal ring and the high-voltage shielding plate, and both ends of the resistor assembly are electrically connected to the grounding metal ring and the high-voltage shielding plate respectively. Each resistor assembly is provided with a BNC connector. The connection ends of the N BNC connectors are led out from the N first signal lead-out holes respectively, and are used to connect to the external first signal acquisition device. The high-voltage cable connector has a high-voltage cable insertion hole in the middle, which corresponds to the middle hole of the grounding metal ring; the high-voltage cable connector is electrically connected to the grounding metal ring to realize the electrical connection between the external high-voltage cable grounding layer and the grounding metal ring. The bottom surface of the high-voltage shielding disk is flat, and there is a gap between it and the bottom surface of the insulating outer cylinder; The coil assembly is coaxially embedded in the high-voltage cable connector, and its connection end extends out of the high-voltage cable connector for connecting to a second external signal acquisition device.

[0005] Furthermore, the resistor assembly includes a low-voltage arm resistor and a high-voltage arm resistor that are coaxially connected; The low-voltage arm resistor is positioned at the top of the high-voltage arm resistor; The BNC connector is located on the connector between the low-voltage arm resistor and the high-voltage arm resistor.

[0006] Furthermore, the cable insertion hole in the middle of the high-voltage cable connector is a stepped hole; The stepped hole includes a large hole on the lower side and a small hole on the upper side; The coil assembly is embedded in the large hole.

[0007] Furthermore, the high-voltage cable connector is provided with a vent hole and a second signal lead-out hole on its side wall; The connection end of the coil assembly is led out to the outside of the high-voltage cable connector through the second signal lead-out hole.

[0008] Furthermore, an inner cylinder connecting ring is provided circumferentially on the outer wall near the top of the insulating inner cylinder; The top surface of the grounding metal ring is provided with an annular groove that matches the inner cylinder connecting ring. The annular groove is arranged circumferentially around the central hole of the grounding metal ring. The inner cylinder connecting ring is embedded in the annular groove to achieve the connection between the insulating inner cylinder and the grounding metal ring.

[0009] Furthermore, the bottom surface of the grounding metal ring is provided with M circular grooves; Each of the M first signal lead-out holes corresponds to one of the M circular grooves; N resistor components are installed one-to-one with N circular grooves; The top of the resistor assembly is fitted into its corresponding circular groove.

[0010] Furthermore, the coil assembly includes a ring-shaped coil frame and connecting wires; The connecting wire is wound on a ring-shaped bobbin coil, and its two ends are led out through the second signal lead-out hole.

[0011] Furthermore, both the low-voltage arm resistor and the high-voltage arm resistor are non-inductive oxide film resistors; The insulating outer cylinder contains an insulating medium. The insulating inner cylinder is filled with dry compressed air or SF6.

[0012] Furthermore, the insulating medium is deionized water or transformer oil; The high-voltage cable connector is generally annular, and its side wall is provided with a weight-reducing groove that is recessed towards the axis of the cable connector hole.

[0013] Furthermore, the insulating outer cylinder is made of polyetheretherketone and has at least two casters at the bottom; The insulating inner cylinder is made of nylon material; The connector between the low-voltage arm resistor and the high-voltage arm resistor is a screw.

[0014] The beneficial effects of this invention are: 1. The portable multi-functional dummy load resistor for pulse source debugging provided by this invention has a compact structure and is flexible in movement. It can simultaneously realize three functions: dummy load, voltage measurement, and current measurement. It is suitable for debugging hundreds of kV pulse sources and is easy to carry.

[0015] 2. This invention uses multiple sets of oxide film resistors instead of electrolyte resistors, which can maintain the stability of the dummy load resistor value and is not easily affected by external conditions such as temperature. The use of a multi-channel parallel structure of "high-voltage arm resistor + low-voltage arm resistor" reduces the loop inductance and simultaneously reduces the single-channel conduction current, avoiding the impact of large current surges on the measurement results of the resistor divider.

[0016] 3. This invention combines an insulating outer cylinder and an insulating inner cylinder, and sets up multiple resistor components between the two, which are formed by connecting low-voltage arm resistors and high-voltage arm resistors in series. This can be used to measure the output voltage and pulse width of a pulse source. At the same time, multiple resistor components are connected in parallel to form a dummy load resistor, and the equivalent resistance of the dummy load can be adjusted by changing the resistance value and the number of parallel components.

[0017] 4. The present invention also provides a high-voltage cable connector at the top of the grounding metal ring, and embeds a coil assembly in the middle of the high-voltage cable connector, which can realize the function of measuring the circuit current.

[0018] 5. In this invention, the grounding metal ring and the high-voltage cable connector are placed on the same side of the insulating outer cylinder, rather than opposite sides, which reduces the overall length of the dummy load resistor.

[0019] 6. In this invention, dry compressed air or SF6 is injected into the insulating inner cylinder. When the insulating inner cylinder, the high-voltage cable connector, and the high-voltage cable form a sealed cavity, the surface insulation strength can be increased, and the length of the insulating inner cylinder can be further reduced.

[0020] 7. The present invention provides a high-voltage shielding disk at the bottom of the insulating inner cylinder, which makes the surface of the dummy load high-voltage end smooth, reduces the electric field enhancement caused by the tip protrusion, and protects the high-voltage arm resistor, preventing the resistor from being damaged due to the large electric field strength at the high-voltage arm resistor port.

[0021] 8. The present invention uses nylon as the insulating inner cylinder material, which has a good tensile strength and can well adapt to the deformation caused by cable plugging.

[0022] 9. This invention uses polyetheretherketone (PEEK) as the insulating outer cylinder material, which has high structural strength, is not easily deformed, and can effectively seal the transformer oil or deionized water filled inside. Compared with using a metal outer cylinder, it also reduces the parasitic capacitance of the dummy load.

[0023] 10. The present invention has casters at the bottom of the insulating outer cylinder to further increase the portability of the dummy load. Attached Figure Description

[0024] Figure 1 This is one of the structural schematic diagrams of a portable multifunctional dummy load embodiment for pulse source debugging according to the present invention; Figure 2 This is a second schematic diagram of a portable multifunctional dummy load embodiment for pulse source debugging according to the present invention; Figure 3 This is the third schematic diagram of a portable multifunctional dummy load embodiment for pulse source debugging according to the present invention; Figure 4 This is one of the partial structural schematic diagrams of a portable multifunctional dummy load embodiment for pulse source debugging according to the present invention; Figure 5 This is a second partial structural schematic diagram of a portable multifunctional dummy load embodiment for pulse source debugging according to the present invention.

[0025] The attached figures are labeled as follows: 1-Insulating outer cylinder, 2-Grounding metal ring, 21-Annular groove, 22-Circular groove, 23-First signal lead-out hole, 3-Insulating inner cylinder, 31-Inner cylinder connecting ring, 4-Resistor assembly, 41-Low voltage arm resistor, 42-High voltage arm resistor, 5-High voltage cable connector, 51-Large hole, 52-Small hole, 53-Ventilation hole, 54-Second signal lead-out hole, 55-Weight reduction groove, 6-High voltage shielding disc, 7-Coil assembly, 71-Annular coil frame, 72-Connecting wire. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention provides a portable, multifunctional dummy load resistor for pulse source debugging, combined with... Figures 1 to 5 As shown, it includes an insulating outer cylinder 1 with its bottom closed, a grounding metal ring 2 covering the top of the insulating outer cylinder 1, an insulating inner cylinder 3 disposed inside the insulating outer cylinder 1, N resistor assemblies 4 disposed inside the insulating outer cylinder 1 and distributed around the insulating inner cylinder 3, a high-voltage cable connector 5 disposed on the top of the grounding metal ring 2, and a coil assembly 7; N≥3; in this embodiment, N=4, that is, a 4-way parallel structure, to achieve an equivalent impedance of 50 ohms.

[0028] The insulating outer cylinder 1 is made of polyetheretherketone and has at least two casters at the bottom for easy movement; the insulating outer cylinder 1 contains insulating media such as deionized water or transformer oil.

[0029] The top surface of the grounding metal ring 2 is provided with an annular groove 21 that matches the inner cylinder connecting ring 31. The annular groove 21 is arranged around the central hole of the grounding metal ring 2. The bottom surface of the grounding metal ring 2 is provided with M circular grooves 22; M≥N; N resistor components 4 are installed one-to-one with the N circular grooves 22. The grounding metal ring 2 is also provided with M first signal lead-out holes 23, and the M first signal lead-out holes 23 correspond one-to-one with the M circular grooves 22.

[0030] An inner cylinder connecting ring 31, matching the annular groove 21 on the grounding metal ring 2, is provided on the outer wall near the top of the insulating inner cylinder 3. This allows the inner cylinder connecting ring 31 to be fitted into the annular groove 21, thus connecting the top of the insulating inner cylinder 3 to the grounding metal ring 2. The inner hole of the insulating inner cylinder 3 corresponds to the middle hole of the grounding metal ring 2. A high-voltage shielding plate 6 is provided at the bottom of the insulating inner cylinder 3. The bottom surface of the high-voltage shielding plate 6 is flat and has a gap with the bottom surface of the insulating outer cylinder 1. The insulating inner cylinder 3 is made of nylon material, which can well adapt to the deformation caused by cable plugging. The use of the high-voltage shielding plate 6 can make the surface of the dummy load high voltage end smooth, reduce the electric field enhancement caused by the tip protrusion, and protect the high voltage arm resistor, preventing resistor damage caused by the high electric field strength at the high voltage arm resistor port.

[0031] The resistor assembly 4 is supported between the grounding metal ring 2 and the high-voltage shielding plate 6, and both ends of the resistor assembly 4 are electrically connected to the grounding metal ring 2 and the high-voltage shielding plate 6 respectively. There is a threaded hole in the middle of the bottom of the resistor assembly 4, and the high-voltage shielding plate 6 has holes corresponding to each resistor assembly. The stud of the screw is passed through the corresponding hole on the high-voltage shielding plate 6 from the bottom and screwed into the threaded hole at the bottom of the resistor assembly 4, so that the two are tightened together and the electrical connection is achieved at the same time.

[0032] The resistor assembly 4 includes a low-voltage arm resistor 41 and a high-voltage arm resistor 42 connected in series on the same axis. The low-voltage arm resistor 41 is disposed on top of the high-voltage arm resistor 42 and is embedded in its corresponding circular groove 22. In this embodiment, both the low-voltage arm resistor 41 and the high-voltage arm resistor 42 are oxide film non-inductive resistors. They are connected in series by screws, and each screw is connected to a BNC connector. The connection end of the BNC connector is led out from the corresponding first signal lead-out hole 23 on the grounding metal ring 2. The high-voltage arm resistor and the low-voltage arm resistor connected in series can form a resistance voltage divider to realize voltage measurement.

[0033] like Figure 3 As shown, the high-voltage cable connector 5 is generally annular, with a weight-reducing groove 55 recessed on its side wall towards the axis of the cable connector hole. The central hole of the high-voltage cable connector 5 is the high-voltage cable connector hole, which corresponds to the central hole of the grounding metal ring 2; Figure 4 As shown, the high-voltage cable connector 5 has a stepped hole in the middle; the stepped hole includes a large hole 51 on the lower side and a small hole 52 on the upper side; the coil assembly 7 is embedded in the large hole 51. The high-voltage cable connector 5 has a vent hole 53 and a second signal lead-out hole 54 on its side wall.

[0034] The insulating inner cylinder 3, the high-voltage cable connector 5, and the external high-voltage cable can form a sealed cavity. By injecting dry compressed air or SF6 into the sealed cavity, the surface insulation strength can be increased and the length of the insulating inner cylinder can be reduced.

[0035] The coil assembly 7 is embedded in the center of the high-voltage cable connector 5, and its connecting end extends out of the high-voltage cable connector 5. The coil assembly 7 includes a ring coil frame 71 and a connecting wire 72; the connecting wire 72 is wound on the ring coil frame 71, and its two ends are led out through the second signal lead-out hole 54.

[0036] In use, the coil assembly 7 is installed into the large hole 51 on the high-voltage cable connector 5, and the two ends of the connecting wire 72 are led out from the second signal lead-out hole 54 on the side of the high-voltage cable connector 5 to draw out the measurement signal.

[0037] Insert the insulating inner cylinder 3 into the central hole of the grounding metal ring 2, and its inner cylinder connecting ring 31 will be embedded in the annular groove 21. Then, install the high-voltage cable connector 5 to the top of the grounding metal ring 2 and press the inner cylinder connecting ring 31, that is, press the insulating inner cylinder 3.

[0038] One end of the low-voltage arm resistor 41 extends into the circular groove 22 on the bottom surface of the grounding metal ring 2 and contacts the grounding metal ring 2. The other end is connected to the high-voltage arm resistor 42 through a screw. The screw is connected to a BNC connector to lead out the measurement signal from the first signal lead-out hole 23 of the grounding metal ring 2.

[0039] The bottom of the high-voltage arm resistor 42 has a threaded hole for connecting to the high-voltage shielding disc 6 via screws, achieving both mechanical and electrical connection. Figure 3 As shown, the high-voltage shielding disk 6 has M small threaded holes. The multiple large holes shown in the figure are for hollowing out to reduce parasitic capacitance and also for weight reduction. The M small threaded holes are respectively set between each adjacent large hole.

[0040] The bottom of the insulating inner cylinder 3 is connected to the high-voltage shielding plate 6 by screws, leaving a gap of 1-2mm to ensure that the low-voltage arm resistor 41 can be tightly connected to the grounding metal ring 2 after tightening.

[0041] Because the resistor is heavy and the BNC connector has poor load-bearing capacity, the above structure allows the weight of the resistor assembly to be mainly borne by the high-voltage shielding plate 6 and the insulating inner cylinder 3. The tight connection can ensure that the BNC connector is not easy to break, and at the same time ensure that the resistor assembly as a whole does not shake.

[0042] Based on the grounding metal ring 2, all components are installed. The grounding metal ring 2 is installed on top of the insulating outer cylinder 1. After adding insulating medium, the dummy load resistor is installed. In use, the external pulse source is connected to the dummy load resistor through a high-voltage coaxial cable. The high-voltage end of the high-voltage coaxial cable is inserted into the insulating inner cylinder 3 and electrically connected to the high-voltage shielding disc 6. Its grounding layer is electrically connected to the grounding metal ring 2 through the high-voltage cable connector 5. The grounding metal ring 2 has screw holes, and the flange on the upper edge of the insulating outer cylinder 1 also has screw holes and a sealing ring groove. After installing the sealing ring, the grounding metal ring 2 and the insulating outer cylinder 1 are installed with screws and nuts. Therefore, insulating medium is added to the insulating outer cylinder 1 first, and then the grounding metal ring 2 is installed to achieve a seal.

[0043] When a high-power, high-current high-voltage pulse is fed into the dummy load resistor, the energy is converted into heat through the parallel resistor assembly. The heat is dissipated with deionized water or transformer oil, resulting in good heat dissipation. Because both the low-voltage arm resistor 41 and the high-voltage arm resistor 42 use oxide film non-inductive resistors, and multiple resistor assemblies are connected in parallel, and the high-voltage lead-in and grounding metal ring 2 are positioned on the same side, this structure ensures that the self-inductance of the dummy load resistor itself is very small, thus accurately simulating the use of a real load. Furthermore, the high-power pulse dummy load resistor of this embodiment is simple, portable, and has a stable resistance value, capable of simultaneously performing dummy load, voltage measurement, and current measurement functions. The high-power dummy load of this embodiment is suitable for testing high-power, high-voltage, and high-current pulse sources, and can also be used for performance testing of DC high-voltage equipment, high-voltage cable insulation testing, and other fields.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A portable, multifunctional dummy load resistor for pulse source debugging, characterized in that: Includes an insulating outer cylinder (1) with its bottom closed, a grounding metal ring (2) covering the top of the insulating outer cylinder (1), an insulating inner cylinder (3) set inside the insulating outer cylinder (1), N resistor assemblies (4) set inside the insulating outer cylinder (1) and distributed around the insulating inner cylinder (3), a high-voltage cable connector (5) set on the top of the grounding metal ring (2), and a coil assembly (7); N≥3; The grounding metal ring (2) is provided with M first signal lead-out holes (23), where M ≥ N; The top of the insulating inner cylinder (3) is connected to the grounding metal ring (2), and its inner hole corresponds to the middle hole of the grounding metal ring (2). A high-voltage shielding plate (6) is provided at its bottom, and its inner hole is used to insert the high-voltage end of the high-voltage cable to be electrically connected to the high-voltage shielding plate (6). The resistor assembly (4) is supported between the grounding metal ring (2) and the high-voltage shielding plate (6), and the two ends of the resistor assembly (4) are electrically connected to the grounding metal ring (2) and the high-voltage shielding plate (6) respectively. Each resistor assembly (4) is provided with a BNC connector; the connection ends of the N BNC connectors are led out from the N first signal lead-out holes (23) respectively, and are used to connect to the external first signal acquisition device. The high-voltage cable connector (5) is provided with a high-voltage cable connector hole in the middle, which corresponds to the middle hole of the grounding metal ring (2); the high-voltage cable connector (5) is electrically connected to the grounding metal ring (2) to realize the electrical connection between the external high-voltage cable grounding layer and the grounding metal ring (2); The bottom surface of the high-voltage shielding disk (6) is flat, and there is a gap between it and the bottom surface of the insulating outer cylinder (1); The coil assembly (7) is coaxially embedded in the high-voltage cable connector (5), and its connection end extends out of the high-voltage cable connector (5) for connecting to the second external signal acquisition device.

2. The portable multifunctional dummy load resistor for pulse source debugging according to claim 1, characterized in that: The resistor assembly (4) includes a low-voltage arm resistor (41) and a high-voltage arm resistor (42) connected coaxially. The low-voltage arm resistor (41) is disposed on top of the high-voltage arm resistor (42); The BNC connector is located on the connector between the low-voltage arm resistor (41) and the high-voltage arm resistor (42).

3. The portable multifunctional dummy load resistor for pulse source debugging according to claim 2, characterized in that: The cable insertion hole in the middle of the high-voltage cable connector (5) is a stepped hole; The stepped hole includes a large hole (51) on the lower side and a small hole (52) on the upper side. The coil assembly (7) is embedded in the large hole (51).

4. The portable multifunctional dummy load resistor for pulse source debugging according to claim 2 or 3, characterized in that: The high-voltage cable connector (5) has a vent hole (53) and a second signal lead-out hole (54) on its side wall. The connection end of the coil assembly (7) is led out to the outside of the high-voltage cable connector (5) through the second signal lead-out hole (54).

5. The portable multifunctional dummy load resistor for pulse source debugging according to claim 4, characterized in that: An inner cylinder connecting ring (31) is provided around the outer wall near the top of the insulating inner cylinder (3). The top surface of the grounding metal ring (2) is provided with an annular groove (21) that matches the inner cylinder connecting ring (31). The annular groove (21) is arranged circumferentially around the central hole of the grounding metal ring (2). The inner cylinder connecting ring (31) is embedded in the annular groove (21) to achieve the connection between the insulating inner cylinder (3) and the grounding metal ring (2).

6. The portable multifunctional dummy load resistor for pulse source debugging according to claim 5, characterized in that: The bottom surface of the grounding metal ring (2) is provided with M circular grooves (22). M first signal lead-out holes (23) correspond one-to-one with M circular grooves (22); N resistor components (4) are installed one-to-one with N circular grooves (22); The top of the resistor assembly (4) is fitted into its corresponding circular groove (22).

7. The portable multifunctional dummy load resistor for pulse source debugging according to claim 6, characterized in that: The coil assembly (7) includes a ring coil frame (71) and connecting wires (72). The connecting line (72) is wound on the ring-shaped bobbin coil (71), and its two ends are led out through the second signal lead-out hole (54).

8. The portable multifunctional dummy load resistor for pulse source debugging according to claim 2, characterized in that: Both the low-voltage arm resistor (41) and the high-voltage arm resistor (42) are non-inductive oxide film resistors; The insulating outer cylinder (1) contains an insulating medium; The insulating inner cylinder (3) is filled with dry compressed air or SF6.

9. The portable multifunctional dummy load resistor for pulse source debugging according to claim 8, characterized in that: The insulating medium is deionized water or transformer oil; The high-voltage cable connector (5) is generally annular, and its side wall is provided with a weight-reducing groove (55) that is recessed in the direction of the cable connector hole axis.

10. The portable multifunctional dummy load resistor for pulse source debugging according to claim 9, characterized in that: The insulating outer cylinder (1) is made of polyetheretherketone and has at least two casters at the bottom; The insulating inner cylinder (3) is made of nylon material; The connector between the low-voltage arm resistor (41) and the high-voltage arm resistor (42) is a screw.

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