An inductive voltage superimposer type device for a short pulse circuit and an assembling method thereof

Abstract

This invention relates to a short-pulse loop induced voltage superimposed device and its assembly method; it solves the problems of long pulse loops and large inductance in existing induced voltage superimposed devices; it includes an induced voltage superimposed device body, which comprises a secondary magnetically insulated transmission line, a first-stage induction cavity, a secondary supporting vacuum cavity, and a ring-shaped short-circuit connecting piece; the secondary magnetically insulated transmission line includes a pulse superimposed section and a cantilever supporting section inner cylinder connected together, the first-stage induction cavity being sleeved outside the pulse superimposed section; the secondary supporting vacuum cavity being sleeved outside the cantilever supporting section inner cylinder, with one side connected to the cantilever supporting section inner cylinder and the other side connected to the first-stage induction cavity; the short-circuit connecting piece is made of conductive material; the short-circuit connecting piece is sleeved outside the pulse superimposed section, located within the gap, and its inner and outer sides are respectively attached to the outer wall of the pulse superimposed section and the inner wall of the first-stage induction cavity; this invention also proposes an assembly method for the above device.

Description

Technical Field

[0001] This invention relates to an induced voltage superimposed device, specifically to an induced voltage superimposed device with a short pulse circuit and its assembly method. Background Technology

[0002] A common technical approach for large pulse power devices is based on the principle of induced voltage superposition. The pulse energy is coupled to the secondary magnetically insulated wire and transmitted to the load using an induction cavity. Typical devices include IVA (Inductive Voltage Adder) and LTD (Linear Transformer Driver). These devices generally adopt a modular design to facilitate expansion and improve the power level of the device. When designing such devices, compact design must be considered to minimize the loop inductance and ensure that the leading edge of the output pulse meets the requirements.

[0003] like Figure 1 As shown, for the inductive voltage superimposed device, the low-voltage end of the first-stage inductive cavity 02 is the ground end, while the secondary magnetically insulated transmission line 01 of the inductive voltage superimposed device is a cantilever support structure. The high-voltage pulse returns from the support end to the ground end of the first-stage inductive cavity along the magnetically insulated transmission line. The pulse loop is long and the inductance is large, which is not conducive to the acquisition of faster leading-edge high-voltage pulses. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that in existing inductive voltage superimposed devices, the high-voltage pulse returns from the support end to the ground end of the first-stage induction cavity along the magnetically insulated transmission line, resulting in a long pulse loop and large inductance, which is not conducive to obtaining a faster leading-edge high-voltage pulse. The invention provides an inductive voltage superimposed device with a short pulse loop and its assembly method, which can realize a short-circuit connection between the secondary magnetically insulated transmission line and the inner wall of the first-stage induction cavity, effectively reducing the loop inductance.

[0005] The concept of this invention is as follows:

[0006] By adding a short-circuit structure at the corresponding position between the first-stage induction cavity and the secondary magnetically insulated transmission line, that is, connecting the secondary to the inner wall of the induction cavity at this position, the loop inductance is minimized without affecting the pulse coupling superposition of the induction cavity.

[0007] To achieve the above concept, the technical solution adopted by this invention is as follows:

[0008] A short-pulse circuit induced voltage superimposed device includes an induced voltage superimposed device body, the induced voltage superimposed device body including a secondary magnetically insulated transmission line, a multi-stage induction cavity arranged side by side, and a secondary support vacuum cavity for fixing the first-stage induction cavity in the multi-stage induction cavity.

[0009] Its special feature is:

[0010] The secondary magnetically insulated transmission line includes a pulse superposition section and a cantilever support section inner cylinder connected in sequence. The first-stage induction cavity is sleeved outside the pulse superposition section, and there is a gap between the two. The secondary support vacuum cavity is sleeved outside the cantilever support section inner cylinder, and one side is sealed to the cantilever support section inner cylinder, and the other side is sealed to the first-stage induction cavity. The secondary support vacuum cavity has an annular notch on the side near the gap, so that the interior of the secondary support vacuum cavity communicates with the gap.

[0011] It also includes a ring-shaped short-circuit connector, which is made of conductive material;

[0012] The short-circuit connecting piece is sleeved outside the pulse superposition section and located inside the gap. The inner and outer sides of the short-circuit connecting piece along the radial direction are respectively attached to the outer wall of the pulse superposition section and the inner wall of the first-stage induction cavity, thereby realizing the electrical connection between the pulse superposition section and the first-stage induction cavity.

[0013] The gaps on the left and right sides of the short-circuit connecting piece are interconnected.

[0014] Furthermore, the outer wall of the pulse superposition segment is provided with an annular groove, and the inner side of the short-circuit connecting piece is installed in the annular groove.

[0015] Furthermore, in order to measure the total current of the induced voltage superposition type device of the short pulse circuit, a Rogowski coil is also included;

[0016] The bottom of the annular groove is provided with an annular rectangular groove;

[0017] The Rogowski coil is installed in an annular rectangular slot;

[0018] The measurement signal line of the Rogowski coil passes through the inside of the secondary magnetically insulated transmission line.

[0019] Furthermore, the short-circuit connecting piece has a periodic butterfly-shaped structure along the circumferential direction;

[0020] The outer circle of the butterfly structure contacts the inner wall of the first-stage induction cavity, and the inner circle of the butterfly structure is connected to the outer wall of the pulse superposition segment. The butterfly structure of the short-circuit connector occupies less space in the radial direction, ensuring vacuum communication between the secondary magnetically insulated transmission line and the front and back of the short-circuit connector, and ensuring the vacuum extraction efficiency of the secondary gap and the insulation stack of the first-stage induction cavity.

[0021] Furthermore, the outer and inner circles of the butterfly-shaped structure form an S-shaped structure.

[0022] Furthermore, the outer edges of the butterfly-shaped structure are treated with beveled edges.

[0023] Furthermore, the short-circuit connector is made of beryllium copper.

[0024] This invention also proposes an assembly method for a short-pulse circuit induced voltage superimposed device, characterized in that, based on the aforementioned short-pulse circuit induced voltage superimposed device, the method includes the following steps:

[0025] Step 1: Adjust the secondary support vacuum cavity to ensure the coaxiality between the secondary magnetically insulated transmission line and the first-stage induction cavity;

[0026] Step 2: Install the short-circuit connector to ensure coaxiality between the short-circuit connector and the inner wall of the first-stage induction cavity, so that the secondary magnetically insulated transmission line can be easily pushed in and pulled out of the first-stage induction cavity;

[0027] Step 3: The short-circuit connector is now installed;

[0028] Step 4: Assembly of other components in the inductive voltage superposition device.

[0029] Furthermore, step 1 also includes: installing the Rogowski coil in a rectangular slot along the circumferential direction of the secondary magnetically insulated transmission line, and leading out the measurement signal line of the Rogowski coil;

[0030] Step 3 further includes: after the short-circuit connector is installed, calibrating the Rogowski coil and providing a sensitivity coefficient.

[0031] The beneficial effects of this invention are:

[0032] 1. The short-circuit connecting piece provided in this invention can realize the short-circuit connection between the secondary magnetically insulated transmission line and the inner wall of the first-stage induction cavity, effectively reducing the loop inductance.

[0033] 2. The short-circuit connector provided in this invention adopts a butterfly structure, and the outer circle and inner circle of the butterfly structure are S-shaped. On the one hand, it ensures the electrical connection between the secondary magnetically insulated transmission line and the inner wall of the first-stage induction cavity. On the other hand, by reasonably selecting the thickness of the short-circuit connector and the curvature of the S-shaped structure, the friction between the outer circle of the butterfly structure and the inner wall of the induction cavity can be reduced, which facilitates the disassembly of the secondary magnetically insulated transmission line and subsequent reconnection.

[0034] 3. The short-circuit connector provided in this invention has a butterfly-shaped structure that occupies less space in the radial direction, ensuring vacuum communication between the secondary magnetically insulated transmission line and the front and back of the short-circuit connector, and ensuring the vacuum extraction efficiency of the secondary gap and the insulation stack of the first-stage induction cavity.

[0035] 4. In this invention, a Rogowski coil is provided at the short-circuit connection point, which can be used to measure the total current of the short-pulse circuit induced voltage superimposed device, providing reliable electrical parameters for the operation of the short-pulse circuit induced voltage superimposed device. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the superposition principle of an existing induced voltage superposition device;

[0037] Figure 1 In the diagram, 01 is the secondary magnetically insulated transmission line; 02 is the first-stage induction cavity.

[0038] Figure 2 This is a schematic diagram of an embodiment of a short-pulse circuit induced voltage superimposed device according to the present invention;

[0039] Figure 3 This is a schematic diagram of the installation structure of the short-circuit connecting piece in an embodiment of the present invention (including pulse superposition segment, short-circuit connecting piece, first-stage induction cavity, Rogowski coil);

[0040] Figure 4 This is a partial cross-sectional view of the mounting structure of the short-circuit connecting piece in an embodiment of the present invention (including the pulse superposition section, the short-circuit connecting piece, the first-stage induction cavity, and the Rogowski coil);

[0041] Figure 5 This is a side view of the short-circuit connecting piece in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the Rogowski coil structure in an embodiment of the present invention;

[0043] Figure 7 yes Figure 2 A magnified view of a portion of the image;

[0044] Figure 8 This is a front view of the short-circuit connecting piece in an embodiment of the present invention;

[0045] Figures 2-8 In the middle, 1-secondary magnetically insulated transmission line; 11-pulse superposition section; 12-cantilever support section inner cylinder; 2-first-stage induction cavity; 3-short-circuit connecting piece; 4-secondary support vacuum cavity; 5-Rogowski coil. Detailed Implementation

[0046] The principle of existing induced voltage superposition devices is as follows: Figure 1 As shown, the device can be equivalent to multiple pulse transformers with a turns ratio of 1:1 connected in parallel. Each induction cavity serves as the primary coil of the pulse transformer, and the secondary magnetically insulated transmission line O1 serves as the secondary coil, realizing the superimposed output of high-voltage pulses, i.e., the output voltage U. o =n·U i U i U is the feed voltage of each induction cavity. oThe voltage output by the secondary magnetically insulated transmission line 01 is the low-voltage end of the first-stage induction cavity 02, which is the grounding end. The secondary magnetically insulated transmission line 01 is a cantilever support structure. The high-voltage pulse travels along the secondary magnetically insulated transmission line 01 and returns from the support end of the secondary magnetically insulated transmission line 01 to the grounding end of the first-stage induction cavity 02. The pulse loop is long and the inductance is large, which is not conducive to the acquisition of a faster leading-edge high-voltage pulse.

[0047] For induced voltage superposition devices, the gap between the inner wall of the first-stage induction cavity 02 and the outer wall of the secondary magnetically insulated transmission line 01 should be minimized. This requires a compact and efficient short-circuit connection structure with good electrical connection. During operation and maintenance, the secondary magnetically insulated transmission line 01 needs to be completely removed. The short-circuit connection structure should minimize friction with the inner wall of the first-stage induction cavity 02 while ensuring electrical contact, facilitating disassembly and subsequent reconnection. The secondary magnetically insulated transmission line 01 operates in a vacuum environment, so the short-circuit connection structure should not affect the vacuum extraction efficiency of the secondary gap. Furthermore, the secondary magnetically insulated transmission line 01 must conduct high-voltage pulses; therefore, the short-circuit connection structure should not be designed as an electrically driven structure to prevent damage to the circuit caused by the high-voltage pulses, which could prevent the secondary magnetically insulated transmission line 01 from being removed.

[0048] Based on this, the present invention proposes a short-pulse circuit induced voltage superposition type device, such as... Figures 2-4 As shown, it includes a secondary magnetically insulated transmission line 1, a first-stage induction cavity 2, a secondary support vacuum cavity 4, a short-circuit connecting piece 3, and a Rogowski coil 5;

[0049] The secondary magnetically insulated transmission line 1 is a cantilever structure, typically 5m to 20m in length, and is made of aluminum alloy (7075). Because it needs to conduct high-voltage pulses, the surface of the secondary magnetically insulated transmission line 1 has rounded corners and a smooth transition, without obvious sharp edges or openings. The secondary magnetically insulated transmission line 1 includes a pulse superposition section 11 and a cantilever support section inner cylinder 12 connected coaxially in sequence. The outer wall of the pulse superposition section 11 is provided with an annular groove that matches the shape of the short-circuit connecting piece 3. The bottom of the annular groove is provided with a rectangular groove with an annular structure. The inner wall of the pulse superposition section 11 with the rectangular groove and the groove is thickened to ensure that the yield strength of the secondary magnetically insulated transmission line 1 at this location is within a safe range.

[0050] The first-stage sensing cavity 2 is sleeved outside the pulse superposition section 11, and there is a gap between the two. The material of the inner wall of the first-stage sensing cavity 2 is aluminum alloy (7075).

[0051] The secondary support vacuum cavity 4 is used for cantilever support of the secondary magnetically insulated transmission line 1, coaxiality adjustment of the secondary magnetically insulated transmission line 1 and the first-stage induction cavity 2, and vacuum extraction of the gap formed between the secondary magnetically insulated transmission line 1 and the first-stage induction cavity 2. The secondary support vacuum cavity 4 includes a hollow first cylinder and a second cylinder connected in sequence. The ends of the first cylinder and the second cylinder that are far apart from each other are open. The inner diameter of the first cylinder is smaller than the inner diameter of the second cylinder. The inner diameter of the first cylinder is the same as the outer diameter of the inner wall of the cantilever support section 12. The secondary support vacuum cavity 4 is sleeved on the outside of the secondary magnetically insulated transmission line 1. The first cylinder is sealed and fixed to the inner cylinder of the cantilever support section 12. The end of the second cylinder that is far away from the first cylinder is sealed and connected to the first-stage induction cavity 2. The interior of the second cylinder is connected to the gap.

[0052] like Figure 5 and Figure 8 As shown, the short-circuit connecting piece 3 is a ring structure made of conductive material and is set in the groove of the outer wall of the pulse superposition section 11, and is located in the gap formed between the first-stage induction cavity 2 and the outer wall of the pulse superposition section 11. The inner and outer sides of the short-circuit connecting piece 3 are respectively attached to the outer wall of the pulse superposition section 11 and the inner wall of the first-stage induction cavity 2 along the radial direction, thereby realizing the electrical connection between the first-stage inner wall of the first-stage induction cavity 2 and the outer wall of the pulse superposition section 11 of the secondary magnetically insulated transmission line 1.

[0053] The short-circuit connector 3 is customized according to the dimensions of the first-stage induction cavity 2 and the pulse superposition segment 11, and is made of beryllium copper to ensure good electrical connection. The short-circuit connector 3 is periodically distributed in a butterfly shape along the circumference. The outer circle of the butterfly structure is in contact with the inner wall of the first-stage induction cavity 2. By reasonably setting the axial length of the short-circuit connector 3 and the outer arc length of the butterfly structure, sufficient contact area is ensured with the inner wall of the first-stage induction cavity 2 to achieve a large current carrying capacity. The inner circle of the butterfly structure is connected to the outer wall of the secondary magnetically insulated transmission line 1. Two through holes are provided radially on the inner circle of each butterfly structure for connection with the screw holes provided on the secondary magnetically insulated transmission line 1 by screws to ensure that the short-circuit connector 3 and the secondary magnetically insulated transmission line 1 have good coaxiality and electrical connection.

[0054] The outer and inner circles of the butterfly structure form an S-shaped structure. This structure ensures that the short-circuit connecting piece 3 has a certain elasticity in the radial direction, which can ensure good electrical contact between the outer circle of the butterfly structure and the outer wall of the first-stage induction cavity 2. By reasonably setting the thickness of the short-circuit connecting piece 3 and the curvature of the S-shaped structure, the radial elasticity of the butterfly structure can be adjusted to ensure that the friction between the outer circle of the butterfly structure and the outer wall of the first-stage induction cavity 2 is moderate, so that the secondary magnetically insulated transmission line 1 can be pushed and pulled into and out of the first-stage induction cavity 2 relatively easily.

[0055] To prevent the outer edge of the butterfly structure from scratching the inner wall surface of the first-stage induction cavity 2 when the secondary magnetically insulated transmission line 1 enters and exits the first-stage induction cavity 2, the outer edge of the butterfly structure is treated with a beveled edge and an arc-shaped transition structure.

[0056] In addition, the butterfly-shaped structure of the short-circuit connector 3 occupies less space in the radial direction, ensuring vacuum connection before and after the short-circuit connector 3 of the secondary magnetically insulated transmission line 1, and ensuring the vacuum extraction efficiency of the gap.

[0057] To measure the total current of the short-pulse loop induced voltage superposition device and provide reliable electrical parameters for its operation, a Rogowski coil 5 is fitted around the outside of the pulse superposition section 11. The Rogowski coil 5 is positioned within a rectangular slot, and its structure is as follows: Figure 6 As shown; due to the periodic butterfly-shaped distribution of the short-circuit connecting piece 3 along the circumferential direction, multiple positions of the Rogowski coil 5 along the circumferential direction are not covered, allowing the magnetic field signal to be observed; as Figure 3 As shown, the measurement signal of the Rogowski coil 5 is led out from the inside of the secondary magnetically insulated transmission line 1. Figure 3 The box in the diagram is the output terminal. A Rogowski coil 5 is installed at this position to measure the total current of the short-pulse circuit induced voltage superposition device, providing reliable electrical parameters for the operation of the short-pulse circuit induced voltage superposition device.

[0058] This invention also proposes an assembly method for a short-pulse circuit induced voltage superimposed device, wherein the installation sequence of the short-circuit connecting piece 3 and the Rogowski coil 5 in the induced voltage superimposed device is as follows:

[0059] 1. Install the Rogowski coil 5 in the rectangular slot along the circumferential direction of the secondary magnetically insulated transmission line 1, and lead out the measurement signal line of the Rogowski coil 5;

[0060] 2. Adjust the secondary support vacuum cavity 4 to ensure the coaxiality between the secondary magnetically insulated transmission line 1 and the first-stage induction cavity 2;

[0061] 3. Install the short-circuit connecting piece 3 to ensure the coaxiality between the short-circuit connecting piece 3 and the inner wall of the first-stage induction cavity 2, so that the secondary magnetically insulated transmission line 1 can be easily pushed and pulled out of the first-stage induction cavity 2;

[0062] 4. After the short-circuit connector 3 is installed, calibrate the Rogowski coil 5 and give the sensitivity coefficient;

[0063] 5. Assembly of other components of the induced voltage superposition device.

[0064] like Figure 7As shown, the current loops with and without short-circuit connector 3 are displayed (solid arrows indicate the current loop after installing short-circuit connector 3, and dashed arrows indicate the current loop without installing short-circuit connector 3). By comparison, it can be seen that installing short-circuit connector 3 reduces the loop inductance and ensures that the output high-voltage pulse has a faster leading edge.

Claims

1. A short pulse circuit induced voltage superimposed device, comprising an induced voltage superimposed device body, the induced voltage superimposed device body comprising a secondary magnetically insulated transmission line (1), a multi-stage induction cavity arranged side by side, and a secondary support vacuum cavity (4) for fixing the first-stage induction cavity (2) in the multi-stage induction cavity; Its features are: The secondary magnetically insulated transmission line (1) includes a pulse superposition section (11) and a cantilever support section inner cylinder (12) connected in sequence. The first-stage induction cavity (2) is sleeved on the outside of the pulse superposition section (11), and there is a gap between the two. The secondary support vacuum cavity (4) is sleeved on the outside of the cantilever support section inner cylinder (12), and one side is sealed to the cantilever support section inner cylinder (12), and the other side is sealed to the first-stage induction cavity (2). The interior of the secondary support vacuum cavity (4) is connected to the gap. It also includes a ring-shaped short-circuit connector (3), which is made of conductive material; The short-circuit connecting piece (3) is sleeved outside the pulse superposition section (11) and located in the gap. The inner and outer sides of the short-circuit connecting piece (3) are respectively attached to the outer wall of the pulse superposition section (11) and the inner wall of the first-stage induction cavity (2) along the radial direction, thereby realizing the electrical connection between the pulse superposition section (11) and the first-stage induction cavity (2). The gaps on the left and right sides of the short-circuit connecting piece (3) are interconnected; The short-circuit connecting piece (3) has a periodic butterfly structure along the circumferential direction; the inner circle of the butterfly structure is connected to the outer wall of the secondary magnetically insulated transmission line (1), and two through holes are provided radially on the inner circle of each butterfly structure for connection with the screw holes provided on the secondary magnetically insulated transmission line (1) by screws; The outer and inner circles of the butterfly-shaped structure form an S-shaped structure. The outer circle of the butterfly structure is in contact with the inner wall of the first-stage sensing cavity (2), and the inner circle of the butterfly structure is connected to the outer wall of the pulse superposition segment (11).

2. The short-pulse circuit induced voltage superposition device according to claim 1, characterized in that: The outer wall of the pulse superposition segment (11) is provided with an annular groove, and the inner side of the short-circuit connecting piece (3) is installed in the annular groove.

3. A short-pulse loop induced-voltage adder type device according to claim 2, characterized in that: It also includes Rogowski coils (5); The bottom of the annular groove is provided with an annular rectangular groove; The Rogowski coil (5) is installed in an annular rectangular slot; The measurement signal line of the Rogowski coil (5) passes through the inside of the secondary magnetically insulated transmission line (1).

4. A short-pulse loop induced-voltage adder type device according to claim 1, characterized in that: The outer edges of the butterfly-shaped structure are processed to form an edge arc transition structure.

5. A short-pulse loop-induced voltage adder type device according to claim 4, characterized in that: The short-circuit connector (3) is made of beryllium copper.

6. A method for assembling a short-pulse circuit induced voltage superposition type device, characterized in that, A short-pulse circuit induced voltage superposition device according to claim 1 or 2 includes the following steps: Step 1: Adjust the secondary support vacuum cavity (4) to ensure the coaxiality between the secondary magnetically insulated transmission line (1) and the first-stage induction cavity (2); Step 2: Install the short-circuit connecting piece (3) to ensure the coaxiality between the short-circuit connecting piece (3) and the inner wall of the first-stage induction cavity (2), and ensure that the secondary magnetically insulated transmission line (1) can be pushed out of the first-stage induction cavity (2); Step 3: Assembly of other components in the induced voltage superposition device.

7. A method for assembling a short-pulse circuit induced voltage superposition type device, characterized in that, A short-pulse circuit induced voltage superposition device according to any one of claims 3-5 includes the following steps: Step 1: Install the Rogowski coil (5) in the rectangular slot along the circumferential direction of the secondary magnetically insulated transmission line (1), and lead out the measurement signal line of the Rogowski coil (5); adjust the secondary support vacuum cavity (4) to ensure the coaxiality between the secondary magnetically insulated transmission line (1) and the first induction cavity (2); Step 2: Install the short-circuit connecting piece (3) to ensure the coaxiality between the short-circuit connecting piece (3) and the inner wall of the first-stage induction cavity (2), and ensure that the secondary magnetically insulated transmission line (1) can be pushed out of the first-stage induction cavity (2); Step 3: After the short-circuit connector (3) is installed, calibrate the Rogowski coil (5) and give the sensitivity coefficient; Step 4: Assembly of other components in the inductive voltage superposition device.

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