CN110429925B - A kind of all-solid-state trigger isolation resistor - Google Patents

Abstract

The invention provides an all-solid-state trigger isolation resistor, which solves the problems of poor resistance stability, easy breakdown, serious damage consequence, difficult mechanical fixation, large thermal expansion coefficient and the like of a water resistor in the conventional primary pulse source. The all-solid-state trigger isolation resistor adopts an all-solid-state design, and has the characteristics of high power capacity, high voltage resistance, stable resistance value, convenience in installation, good environmental adaptability and the like. The all-solid-state trigger isolation resistor comprises a resistor substrate, two contact finger springs and two shielding end caps; one end of the shielding end cap is provided with an axial groove, and the groove wall of the axial groove is connected with the radial end face of the shielding end cap through an arc surface; the two ends of the resistor matrix are respectively inserted into the axial grooves of the shielding end caps, the wall of each axial groove is provided with a radial annular groove, and the contact finger springs are arranged in the radial annular grooves to realize the electric connection of the shielding end caps and the resistor matrix.

Description

A kind of all-solid-state trigger isolation resistor

technical field

The invention relates to a pulse power device, in particular to an all-solid-state trigger isolation resistor, which is applied to the trigger isolation of a primary pulse source in a large pulse power device.

Background technique

Fast linear transformer drive source (FLTD) is a new type of drive source capable of generating high voltage and high current. It is characterized by integrating the traditional pulse generation, compression and shaping links in a circle with a height of 20cm to 35cm and a diameter of less than 3.0m. In the disk-shaped cavity, an electrical power pulse with a rising edge of about 100ns is directly generated. The peak output current of a single FLTD module can reach 2.0MA. Compared with the traditional Marx combined with multi-stage water medium pulse compression forming technology, it has many advantages and has become one of the most competitive technologies for the development of the next generation of large-scale drive sources.

The structure of the FLTD module is shown in Figure 1. The primary pulse source is connected in parallel by multiple discharge branches, and each discharge branch is composed of two positively and negatively charged capacitors 25 and an electric trigger gas switch 22. The discharge of each discharge branch The circuits all wrap around the magnetic core 28 once, and the secondary is a metal cylinder. The circuit of the whole module is equivalent to that the primary is connected in parallel with multiple single-turn coils, and the secondary is a single-turn coil. When the discharge branches work synchronously, the secondary load can obtain approximately the same peak voltage as the primary charging voltage, while the current is It is N times the current of a single discharge branch (N is the number of parallel connection of module discharge branches). The working process of the FLTD module is mainly divided into two steps: the first step is to DC charge each capacitor 25 through the high-voltage charging resistor 21 and the high-voltage charging cable 24; the second step is to provide an electric trigger signal from an external circuit to control the synchronous conduction of each electric trigger gas switch 22 .

The triggering process is as follows: the intermediate insulating disc 26 is provided with a ring-shaped trigger line 27, the external trigger is connected to the ring-shaped trigger line 27 through a high-voltage trigger cable 29, and the trigger electrodes of each electric trigger gas switch 22 are connected through a high-voltage trigger resistor 23 To the donut type trigger wire 27. After the charging of the module is completed, the external trigger generates a trigger signal, and the trigger signal is transmitted to the ring-shaped trigger line 27 through the high-voltage trigger cable 29, and the ring-shaped trigger line 27 distributes the trigger signal along the angle, and passes through the high-voltage trigger resistor 23 Applied to the trigger electrode of each electrically activated gas switch 22, thereby achieving approximately synchronous closing of each electrically activated gas switch.

It can be seen from the above triggering process that the synchronous discharge of the multi-level discharge unit is realized by controlling the electric trigger gas switch 22 inside the unit through the external trigger pulse through the high-voltage trigger resistor 23. Each discharge unit needs at least one high-voltage trigger resistor 23, so a single primary The number of high-voltage trigger resistors 23 required by the pulse source is dozens or even hundreds, and its working stability directly determines the overall performance of the primary pulse source, and is also one of the key factors that limit the improvement of the reliability of the pulse power device. Therefore, it is of great engineering application value to carry out the exploration of high-reliability new high-voltage resistors.

Aiming at the design of high-power high-voltage resistors for primary pulse sources, many explorations and researches have been carried out at home and abroad, but up to now, the use of water resistors (resistors with a certain conductive liquid as the medium) has not been able to be separated. In "Compact 810 kA linear transformer drivercavity" (Physical Review Special Topic-Accelerator and Beams, 2011, 14, pp.040401) by J.R.Woodworth, W.E.Fowler, B.S.Stoltzfus and other scholars, a parallel connection of 20 discharge branches is proposed. Fast linear transformer drive source module, each discharge branch contains a trigger resistor, the trigger resistor is composed of a plastic hose with conductive fluid inside, and the two ends of the hose are plugged with metal caps to seal the conductive fluid, and the metal cap is used as an electrical connection with the external Component connections (capacitors or switches). The advantages of this type of resistor are large power capacity, simple structure, and low cost, but there are problems in the following aspects in engineering practice: 1) The resistance value is unstable; Changes in conditions such as time and ambient temperature, the electrolyte is prone to coagulation, precipitation and other changes, which in turn lead to changes in the resistance of the water resistance; The dielectric constant is only about 1/81 of the electrolyte, which means that its internal electric field strength is 81 times that of the electrolyte, and the local electric field is severely distorted, which in turn leads to resistance failure caused by bubble breakdown; 3) Damage leads to serious consequences; usually the primary The pulse source is filled with transformer oil medium. When the water resistance is damaged and ruptured, the electrolyte will pollute the transformer oil in the entire primary source cavity, causing huge economic losses and difficulty in maintenance; 4) Mechanical fixation is difficult; Considering the length and thermal expansion and contraction effects, the outer wall of the water resistor is mostly made of plastic hose. During long-term use, due to the action of electromotive force, it is easy to cause deformation of the hose, resulting in root breakage and even insulation between the positive and negative charging resistors. Breakdown; 5) Thermal expansion and contraction are obvious; the thermal expansion coefficient of the electrolyte is large, and the thermal expansion and contraction range is large during the ambient temperature change process, which may easily cause the hose to rupture or the metal cap at the end to detach, resulting in damage to the resistance, especially in It is even more unusable when the ambient temperature is lower than 0°C or higher than 100°C, which directly limits the use environment of the primary pulse source.

To sum up, the high-voltage resistor is one of the key unit components of the primary pulse source in large-scale pulse power devices. Although water resistors are used as trigger resistors in many primary pulse sources, there are obvious deficiencies in them, which seriously restrict the primary pulse. Improvement of source reliability.

Contents of the invention

The invention provides an all-solid-state trigger isolation resistor, which solves the problems of poor resistance stability, easy breakdown, serious damage consequences, difficult mechanical fixation, and large thermal expansion coefficient existing in the water resistor in the existing primary pulse source. The trigger isolation resistor adopts an all-solid-state design, which has the characteristics of high power capacity, high voltage resistance, stable resistance, convenient installation, and good environmental adaptability.

The technical scheme that the present invention solves the above problems is:

An all-solid-state trigger isolation resistor, including a resistor base, two finger springs and two shielding end caps; one end of the shielding end cap is provided with an axial groove, and the groove wall of the axial groove is in contact with the shielding end The radial end surface of the cap is connected by an arc surface; the two ends of the resistance matrix are respectively inserted into the axial groove of the shielding end cap, and the groove wall of the axial groove is provided with a radial annular groove. The contact finger spring is installed in the radial annular groove to realize the electrical connection between the shielding end cap and the resistance matrix.

Further, the part where the resistor base is inserted into the shielding end cap is provided with a metal coating layer.

Further, the metal coating layer is a copper coating layer, a silver coating layer or a gold coating layer.

Further, the cross-sectional shape of the radial annular groove is trapezoidal, and the cross-sectional shape of the contact finger spring is elliptical, so as to ensure good electrical contact between the shielding end cap and the resistance matrix under the condition of plugging.

Further, the resistance matrix is formed by pressing an insulating material doped with a conductive material.

Further, the resistance matrix is formed by pressing ceramic-doped graphite or ceramic-doped aluminum powder.

Further, the resistance matrix is a cylindrical structure or a rectangular parallelepiped structure.

Further, the inner diameter of the finger spring is 0.8mm-1.0mm smaller than the radius of the axial groove.

Further, the finger springs are springs made of beryllium copper.

Further, the resistance matrix has a diameter of 15 mm and an axial length of 150 mm.

Compared with the prior art, the present invention has the following advantages:

The all-solid-state trigger isolation resistor of the present invention is a solid resistor, which fully utilizes the characteristics of the solid resistor itself (low inductance, large power capacity, and high withstand voltage level), and realizes the all-solid-state design of the high-power high-voltage resistor of the primary pulse source , proposed a system solution in the design of high-power high-voltage resistors in the primary pulse source, which solved the problems of poor resistance stability, easy breakdown, serious damage consequences, difficult mechanical fixation, and large thermal expansion coefficient of traditional water resistors. The high-voltage resistor is easy to be mass-produced industrially, effectively improves the reliability of this type of resistor, and provides an important reference for the engineering practice of the primary pulse source high-voltage resistor.

Description of drawings

Figure 1 is a schematic diagram of the existing FLTD module structure;

Fig. 2 is the installation schematic diagram of the all-solid-state trigger isolation resistor of the present invention;

FIG. 3 is a schematic structural diagram of an all-solid-state trigger isolation resistor of the present invention.

Reference signs: 1-all solid-state trigger isolation resistor, 2-charging resistor, 11-resistor matrix, 12-finger spring, 13-shielding end cap, 14-axial groove, 15-radial annular groove, 16 -Metal coating layer, 21-high voltage charging resistor, 22-electric trigger gas switch, 23-high voltage trigger resistor, 24-high voltage charging cable, 25-capacitor, 26-intermediate insulating disc, 27-trigger wire, 28-magnetic core, 29 - High voltage trigger cable.

detailed description

The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The invention provides a trigger isolation resistor, which is an all-solid-state high-power high-voltage resistor. In the primary pulse source, the trigger isolation resistance requires it to have the characteristics of low inductance, large power capacity, and high withstand voltage. According to the above characteristics, the trigger isolation resistor of the present invention adopts an all-solid design to meet the requirements of high-voltage resistors with different functions on parameters such as inductance, power capacity, and withstand voltage.

As shown in Figure 2, the all-solid-state trigger isolation resistor provided by the present invention uses a ceramic solid resistor, which is characterized by low inductance and high withstand voltage. Although the power capacity is not as good as that of wire-wound resistors, it can fully withstand the trigger pulse energy. During installation, one end of the all-solid-state trigger isolation resistor is connected to the trigger electrode of the electric trigger gas switch 22, and the other end is connected to the trigger control signal source.

The cross-sectional structure of the all-solid-state trigger isolation resistor along the length direction is shown in FIG. 3 , which includes a resistor base 11 , two finger springs 12 and two shielding end caps 13 . The resistor matrix 11 is made of insulating material doped with conductive material, such as ceramic doped with graphite, ceramic doped with aluminum powder, etc. It can be made into various structures, such as cylindrical, cuboid, etc., according to the specific use environment requirements. The surface of both ends of the resistance base 11 and the end cylinder are coated with a metal coating layer 16 (the part where the resistance base 11 is inserted into the shielding end cap 13), which is used for electrical contact with external components. In order to enhance the conductivity, it is best to choose Copper, silver or gold material. One end of the shielding end cap 13 is provided with an axial groove 14, and the groove wall of the axial groove 14 and the end face corner of the shielding end cap 13 are set as arc surfaces (the groove wall of the axial groove 14 and the edge of the shielding end cap 13 The radial end surface is connected by an arc surface); the two ends of the resistance matrix 11 are respectively inserted into the axial groove 14 of the shielding end cap 13, and the groove wall of the axial groove 14 is provided with a radial annular groove 15, and the contact finger The spring 12 is installed in the radial annular groove 15 for realizing the electrical connection between the shielding end cap 13 and the resistance base 11 . Specifically, the cross-sectional shape of the radial annular groove 15 can be trapezoidal, and the cross-sectional shape of the finger spring 12 is elliptical, so as to ensure good electrical contact between the shielding end cap 13 and the resistor base 11 under the condition of plugging.

In actual processing, the shielding end cap 13 is processed with a groove consistent with the interface of the resistance base 11, the depth of which is slightly greater than the length of the metal coating at the end of the resistance base 11, and the edges are rounded to shield the insulating base and the shielding end. The electric field at the joint point at the root of the cap 13. The solid resistance of the present invention adopts measures such as contact finger spring 12 connection, end shielding, etc., to ensure the overall withstand voltage level of the resistance.

The following takes the fast linear transformer drive source module as an example for details. The half-unit structure of the fast linear transformer drive source module is shown in Figure 2. The entire module consists of 32 discharge branches, and each discharge branch includes two capacitors 25, an electric trigger gas switch 22, and a charging resistor 2. Wire-wound resistors are used, arranged between the two branch electric trigger gas switches, and are divided into upper and lower rows; all solid-state trigger isolation resistor 1 adopts ceramic solid resistors, and is connected from the trigger wire on the ring wall of the module to the electric trigger gas switch 22 on the trigger electrode.

The structure of the all-solid-state trigger isolation resistor is shown in FIG. 3 , which is mainly composed of three parts: a resistor base 11 , a finger spring 12 and a shielding end cap 13 . The resistance matrix 11 is made of ceramic-doped graphite material, which is cylindrical as a whole, with a diameter of 15mm and an axial length of 150mm; both ends of the resistance matrix 11 and the end cylindrical surface are treated with metal coating within 10mm of the distance, and the material is silver, The thickness is 50 μm, which is used to improve the electrical contact characteristics between the resistance matrix 11 and the finger spring 12 . The shielding end cap 13 has a length of 15 mm, an outer diameter of 30 mm, an inner diameter of 15.5 mm, and a depth of 12 mm. There is an annular groove at a position 4 mm from the annular edge of the shielding end cap 13. The cross section of the trapezoid is trapezoidal. The bottom length is 6mm and the height is 3mm, which is used to place the finger spring 12; the finger spring 12 is made of beryllium copper material, the wire diameter is 1.0mm, the cross section is elliptical structure, the major axis is 5mm, the minor axis is 4mm, and the inclination angle is 10°. After the contact finger spring 12 is assembled to the shielding end cap 13, the protruding height is about 0.8mm to 1.0mm (the inner diameter of the finger spring 12 is smaller than the radius of the axial groove 14 by 0.8mm to 1.0mm), so as to ensure Good electrical contact between the shield end cap 13 and the resistor base 14 .

Claims (10)

1. An all-solid-state trigger isolation resistor is characterized in that: it comprises a resistance matrix (11), two finger springs (12) and two shielding end caps (13); One end of the shielding end cap (13) is provided with an axial groove (14), and the groove wall of the axial groove (14) is connected with the radial end surface of the shielding end cap (13) through an arc surface; The two ends of the resistance matrix (11) are respectively inserted into the axial grooves (14) of the shielding end cap (13), and the groove walls of the axial grooves (14) are provided with radial annular grooves (15 ), the finger springs (12) are installed in the radial annular groove (15) to realize the electrical connection between the shielding end cap (13) and the resistance base (11). 2. The all-solid-state trigger isolation resistor according to claim 1, characterized in that: the part where the resistor base (11) is inserted into the shielding end cap (13) is provided with a metal coating layer (16). 3. The all-solid-state trigger isolation resistor according to claim 2, characterized in that: the metal coating layer (16) is a copper coating layer, a silver coating layer or a gold coating layer. 4. The all-solid-state trigger isolation resistor according to claim 1, 2 or 3, characterized in that: the cross-sectional shape of the radial annular groove (15) is trapezoidal, and the cross-sectional shape of the finger spring (12) is is elliptical. 5. The all-solid-state trigger isolation resistor according to claim 4, characterized in that: the resistor base (11) is formed by pressing an insulating material doped with a conductive material. 6. The all-solid-state trigger isolation resistor according to claim 5, characterized in that: the resistor matrix (11) is made of ceramic doped graphite or ceramic doped aluminum powder. 7. The all-solid-state trigger isolation resistor according to claim 6, characterized in that: the resistor base (11) is a cylindrical structure or a cuboid structure. 8. The all-solid-state trigger isolation resistor according to claim 7, characterized in that: the inner diameter of the finger spring (12) is 0.8mm-1.0mm smaller than the radius of the axial groove (14). 9. The all-solid-state trigger isolation resistor according to claim 8, characterized in that: the finger spring (12) is a spring made of beryllium copper. 10. The all-solid-state trigger isolation resistor according to claim 9, characterized in that: the resistor base (11) has a diameter of 15 mm and an axial length of 150 mm.

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