CN110429925B - All-solid-state trigger isolation resistor - Google Patents
All-solid-state trigger isolation resistor Download PDFInfo
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- CN110429925B CN110429925B CN201910665125.9A CN201910665125A CN110429925B CN 110429925 B CN110429925 B CN 110429925B CN 201910665125 A CN201910665125 A CN 201910665125A CN 110429925 B CN110429925 B CN 110429925B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C8/00—Non-adjustable resistors consisting of loose powdered or granular conducting, or powdered or granular semi-conducting material
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
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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
Technical Field
The invention relates to a pulse power device, in particular to an all-solid-state trigger isolation resistor which is applied to trigger isolation of a primary pulse source in a large-scale pulse power device.
Background
The fast linear transformer driving source (FLTD) is a new driving source capable of producing high voltage and large current, and features that the traditional pulse producing, compressing and forming links are integrated into disc cavity with height of 20-35 cm and diameter less than 3.0m to produce electric power pulse with rising edge of 100ns directly. The peak value of the output current of a single FLTD module can reach 2.0MA, compared with the traditional Marx combined multi-stage water medium pulse compression forming technology, the peak value of the output current of the single FLTD module has a plurality of advantages, and the peak value becomes one of the competitive technologies for the development of the next generation large driving source.
The structure of the FLTD module is shown in fig. 1, the primary pulse source is formed by connecting a plurality of discharging branches in parallel, each discharging branch is formed by two capacitors 25 charged positively and negatively and one electrically triggered gas switch 22, the discharging loop of each discharging branch surrounds a magnetic core 28 for one circle, and the secondary is a metal cylinder. In the circuit of the whole module, when a primary winding is connected with a plurality of single-turn coils in parallel, a secondary winding is a single-turn coil, and each discharging branch circuit works synchronously, a secondary load can approximately obtain a peak voltage consistent with the primary charging voltage, and the current is N times of the current of the single discharging branch circuit (N is the parallel number of the discharging branch circuits of the module). The working process of the FLTD module mainly comprises two steps: in the first step, each capacitor 25 is charged with direct current through a high-voltage charging resistor 21 and a high-voltage charging cable 24; in the second step, the external circuit provides an electrical trigger signal to control the electrical trigger gas switches 22 to be synchronously conducted.
The triggering process is as follows: the middle insulating disc 26 is provided with a circular ring type trigger line 27, the external trigger is connected with the circular ring type trigger line 27 through a high-voltage trigger cable 29, and the trigger electrode of each electric trigger gas switch 22 is connected to the circular ring type trigger line 27 through a high-voltage trigger resistor 23. After the module charging is completed, the external trigger generates a trigger signal, the trigger signal is transmitted to the annular trigger line 27 through the high-voltage trigger cable 29, the annular trigger line 27 distributes the trigger signal in an angular direction, and the trigger signal is applied to the trigger electrodes of the electrical trigger gas switches 22 through the high-voltage trigger resistor 23, so that the approximate synchronous closing of the electrical trigger gas switches is realized.
It can be known from the above triggering process that the synchronous discharge of the multi-stage discharge unit is realized by controlling the electric trigger gas switch 22 inside the unit through the high-voltage trigger resistor 23 by the external trigger pulse, and each stage of discharge unit needs at least 1 high-voltage trigger resistor 23, so that the number of the high-voltage trigger resistors 23 required by a single primary pulse source reaches tens of or even hundreds of, and the working stability directly determines the overall performance of the primary pulse source, which is also one of the key factors limiting the improvement of the reliability of the pulse power device. Therefore, the development of a novel high-voltage resistor with high reliability has important engineering application value.
Aiming at the design of a primary pulse source high-power high-voltage resistor, numerous exploration and research are carried out at home and abroad, but at present, the use of water resistance (resistance using a certain conductive liquid as a medium) cannot be separated all the time. In Compact 810 kA linear transformer driver capacity (Physical Review specific diode-inductor and Beams,2011, 14, pp.040401) of the scholars of j.r.woodworth, w.e.fowler, b.s.stoltzfus, etc., a fast linear transformer driver source module with 20 parallel discharge branches is proposed, each discharge branch includes a trigger resistor, the trigger resistor is composed of a plastic hose filled with a conductive liquid, metal caps are inserted at both ends of the hose to seal the conductive liquid, and the metal caps are used as electrical connectors to be connected with external components (capacitors or switches). The advantages of such resistors are large power capacity, simple structure and low cost, but the following problems exist in engineering practice: 1) The resistance value is unstable; the water resistance is formed by matching electrolyte and purified water, and the electrolyte is easy to change such as condensation, precipitation and the like along with the change of conditions such as standing time, environmental temperature and the like, so that the resistance value of the water resistance is changed; 2) Breakdown easily occurs; the water resistance is easy to separate out tiny bubbles under the standing condition, and the dielectric constant of the bubbles is only about 1/81 of that of the electrolyte, which means that the electric field intensity in the water resistance is 81 times that of the electrolyte, and the local electric field is seriously distorted, thereby causing the resistance failure caused by bubble breakdown; 3) Damage can have serious consequences; usually, a primary pulse source is full of a transformer oil medium, and when a water resistor is damaged and broken, the electrolyte can pollute the transformer oil in the whole primary source cavity, so that huge economic loss and maintenance difficulty are caused; 4) Difficulty in mechanical fixation; in consideration of installation convenience, increase of the length of the edge surface and expansion and contraction effects, the outer wall of the water resistor is mostly made of plastic hoses, and during long-time use, the hoses are easy to deform due to the action of electric force, so that root breakage is caused, and even insulation breakdown between positive and negative charging resistors is caused; 5) The expansion with heat and the contraction with cold are obvious; the thermal expansion coefficient of the electrolyte is large, the thermal expansion and contraction amplitude is large in the process of environmental temperature change, the hose is easy to break or the end metal cap is easy to separate, the resistor is damaged, the electrolyte cannot be used particularly at the environmental temperature lower than 0 ℃ or higher than 100 ℃, and the use environment of a primary pulse source is directly limited.
In summary, the high voltage resistor is one of the key unit components of the primary pulse source in the large pulse power device, and although many primary pulse sources all use water resistors as trigger resistors, the high voltage resistor has obvious disadvantages and seriously restricts the improvement of the reliability of the primary pulse source.
Disclosure of Invention
The invention provides an all-solid-state trigger isolation resistor, which solves the problems of poor resistance stability, easy breakdown, serious damage effect, difficult mechanical fixation, large thermal expansion coefficient and the like of a water resistor in the conventional primary pulse source. The trigger isolation resistor adopts a full 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 technical scheme for solving the problems is as follows:
an all-solid-state trigger isolation resistor comprises a resistor substrate, two contact finger springs and two shielding end caps; an axial groove is formed in one end of the shielding end cap, 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 base body are respectively inserted into the axial grooves of the shielding end caps, the groove walls of the axial grooves are provided with radial annular grooves, and the contact finger springs are installed in the radial annular grooves to realize the electric connection of the shielding end caps and the resistor base body.
Furthermore, a metal coating layer is arranged on the part of the resistor substrate inserted into the shielding end cap.
Further, the metal coating layer is a copper coating layer, a silver coating layer or a gold coating layer.
Furthermore, the cross section of the radial annular groove is trapezoidal, and the cross section of the contact finger spring is oval, so that good electric contact between the shielding end cap and the resistor substrate under the plugging condition is ensured.
Furthermore, the resistor matrix is formed by pressing an insulating material doped with a conductive material.
Furthermore, the resistor matrix is formed by pressing ceramic-doped graphite and ceramic-doped aluminum powder.
Further, the resistor substrate is of a cylindrical structure or a cuboid structure.
Furthermore, the inner diameter of the contact finger spring is 0.8-1.0 mm smaller than the radius of the axial groove.
Further, the contact finger spring is made of beryllium copper.
Further, the diameter of the resistor matrix is 15mm, and the axial length is 150mm.
Compared with the prior art, the invention has the following advantages:
the all-solid-state trigger isolation resistor is an entity resistor, fully utilizes the characteristics of the entity resistor (low inductance, large power capacity and high voltage resistance level), realizes the all-solid-state design of the high-power high-voltage resistor of the primary pulse source, provides a system solution in the design of the high-power high-voltage resistor in the primary pulse source, and solves the problems of poor resistance stability, easy breakdown, serious damage consequence, difficult mechanical fixation, large thermal expansion coefficient and the like of the traditional water resistor. The high-voltage resistor is easy for industrial batch production, effectively improves the reliability of the resistor, and provides important reference for the engineering practice of the high-voltage resistor of the primary pulse source.
Drawings
FIG. 1 is a schematic diagram of a conventional FLTD module;
FIG. 2 is a schematic diagram of the installation 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 according to the present invention.
Reference numerals: 1-all-solid-state trigger isolation resistor, 2-charging resistor, 11-resistor substrate, 12-contact 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-middle insulating disc, 27-trigger wire, 28-magnetic core and 29-high-voltage trigger cable.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples.
The invention provides a trigger isolation resistor which is a fully solid state high-power high-voltage resistor. In the primary pulse source, the trigger isolation resistor is required to have the characteristics of low inductance, large power capacity, high voltage resistance and the like. According to the characteristics, the trigger isolation resistor adopts a full solid state design so as to meet the requirements of high-voltage resistors with different functions on parameters such as inductance, power capacity, voltage resistance and the like.
As shown in fig. 2, the all-solid-state trigger isolation resistor provided by the present invention uses a ceramic solid resistor, and is characterized by low inductance, high voltage resistance, and a power capacity that is not as high as that of a wire-wound resistor but can completely withstand the energy of the trigger pulse. When being installed, one end of the all-solid-state trigger isolation resistor is connected with the trigger electrode of the electric trigger gas switch 22, and the other end is connected with a 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, and comprises a resistor base body 11, two finger springs 12 and two shielding end caps 13. The resistor matrix 11 is formed by pressing an insulating material doped with a conductive material, such as ceramic doped graphite, ceramic doped aluminum powder, and the like, and can be made into various structures, such as a cylinder, a cuboid, and the like, according to specific use environment requirements. The resistor base body 11 is coated with metal coating layers 16 (portions of the resistor base body 11 inserted into the shield end caps 13) on both end surfaces and end cylindrical surfaces thereof for electrical contact with external components, and is preferably made of copper, silver or gold material for enhanced electrical conductivity. An axial groove 14 is formed in one end of the shielding end cap 13, and the corner between the groove wall of the axial groove 14 and the end face of the shielding end cap 13 is an arc surface (the groove wall of the axial groove 14 is connected with the radial end face of the shielding end cap 13 through the arc surface); the two ends of the resistor matrix 11 are respectively inserted into the axial grooves 14 of the shielding end caps 13, the wall of each axial groove 14 is provided with a radial annular groove 15, and the contact finger springs 12 are installed in the radial annular grooves 15 and used for achieving the electric connection between the shielding end caps 13 and the resistor matrix 11. In particular, the radial annular groove 15 may have a trapezoidal cross-section and the finger spring 12 may have an oval cross-section, in order to ensure good electrical contact in the plugged condition of the shielding end cap 13 and the resistor substrate 11.
During actual processing, the shielding end cap 13 is processed to form a groove consistent with the interface of the resistor substrate 11, the depth of the groove is slightly greater than the length of the metal coating at the end of the resistor substrate 11, and the edge of the groove is rounded to shield an electric field at the joint of the insulating substrate and the root of the shielding end cap 13. The solid resistor adopts the measures of contact finger spring 12 connection, end shielding and the like, thereby ensuring the whole voltage-resistant level of the resistor.
The details will be described below by taking a flyback transformer drive source module as an example. The structure of one-half unit of the driving source module of the fast straight type transformer is shown in fig. 2, the whole module consists of 32 discharge branches, each discharge branch comprises two capacitors 25 and 1 electrically-triggered gas switch 22, the charging resistor 2 adopts a wire-wound resistor, is arranged between the two electrically-triggered gas switches and is divided into an upper row and a lower row; the all-solid-state trigger isolation resistor 1 is a ceramic solid resistor and is connected to a trigger electrode of an electric trigger gas switch 22 from a trigger line on the module annular wall.
The all-solid-state trigger isolation resistor structure is shown in fig. 3 and mainly comprises a resistor base body 11, a contact finger spring 12 and a shielding end cap 13. The resistor matrix 11 is formed by pressing a ceramic-doped graphite material, and is integrally cylindrical, the diameter of the resistor matrix is 15mm, and the axial length of the resistor matrix is 150mm; the two end faces and the end cylindrical surface of the resistor matrix 11 are subjected to metal coating treatment within 10mm of distance, the material is silver, the thickness is 50 microns, and the electric contact characteristic between the resistor matrix 11 and the finger spring 12 is improved. The length of the shielding end cap 13 is 15mm, the outer diameter is 30mm, the inner diameter is 15.5mm, the depth is 12mm, an annular groove is arranged at a position 4mm away from the annular edge of the shielding end cap 13, the section of the annular groove is trapezoidal, the length of the upper bottom of the trapezoid is 4mm, the length of the lower bottom of the trapezoid is 6mm, the height of the trapezoid is 3mm, and the annular groove is used for placing the contact finger spring 12; the finger spring 12 is made of beryllium copper, the diameter of the wire is 1.0mm, the cross section of the finger spring is of an elliptical structure, the major axis of the finger spring is 5mm, the minor axis of the finger spring is 4mm, and the inclination angle is 10 degrees. The protruding height of the finger spring 12 after being assembled to the shielding end cap 13 is about 0.8mm to 1.0mm (the inner diameter of the finger spring 12 is 0.8mm to 1.0mm smaller than the radius of the axial groove 14), so as to ensure good electrical contact between the shielding end cap 13 and the resistor base 14 under the plugging condition.
Claims (10)
1. An all-solid-state trigger isolation resistor is characterized in that: the device comprises a resistor base body (11), two contact 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 face of the shielding end cap (13) through an arc surface;
the resistance resistor is characterized in that two ends of the resistor base body (11) are respectively inserted into axial grooves (14) of the shielding end caps (13), radial annular grooves (15) are formed in the groove walls of the axial grooves (14), and the contact finger springs (12) are installed in the radial annular grooves (15) to achieve electric connection of the shielding end caps (13) and the resistor base body (11).
2. The all-solid-state triggered isolation resistor of claim 1, wherein: and a metal coating layer (16) is arranged on the part of the resistor substrate (11) inserted into the shielding end cap (13).
3. The all-solid-state trigger isolation resistor according to claim 2, wherein: the metal coating layer (16) is a copper coating layer, a silver coating layer or a gold coating layer.
4. The all-solid-state triggered isolation resistor of claim 1, 2 or 3, wherein: the cross section of the radial annular groove (15) is trapezoidal, and the cross section of the contact finger spring (12) is oval.
5. The all-solid-state trigger isolation resistor according to claim 4, wherein: the resistor matrix (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, wherein: the resistor matrix (11) is formed by pressing ceramic-doped graphite and ceramic-doped aluminum powder.
7. The all-solid-state triggered isolation resistor of claim 6, wherein: the resistor matrix (11) is of a cylindrical structure or a cuboid structure.
8. The all-solid-state trigger isolation resistor according to claim 7, wherein: the inner diameter of the contact finger spring (12) is 0.8-1.0 mm smaller than the radius of the axial groove (14).
9. The all-solid-state triggered isolation resistor of claim 8, wherein: the contact finger spring (12) is made of beryllium copper materials.
10. The all-solid-state trigger isolation resistor of claim 9, wherein: the resistor matrix (11) is 15mm in diameter and 150mm in axial length.
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| CN201910665125.9A CN110429925B (en) | 2019-07-23 | 2019-07-23 | All-solid-state trigger isolation resistor |
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| CN201910665125.9A CN110429925B (en) | 2019-07-23 | 2019-07-23 | All-solid-state trigger isolation resistor |
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| CN110429925B true CN110429925B (en) | 2023-01-17 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE387497B (en) * | 1975-06-19 | 1976-09-06 | Ericsson Telefon Ab L M | PULSE GENERATOR |
| CN101261893A (en) * | 2008-04-14 | 2008-09-10 | 佛山市浦斯电子有限公司 | Heat protection pressure sensitive resistor module |
| WO2012171221A1 (en) * | 2011-06-17 | 2012-12-20 | Littelfuse, Inc. | Thermal metal oxide varistor circuit protection device |
| CN102859615A (en) * | 2010-02-19 | 2013-01-02 | 依斯克拉扎斯赛特公司 | Excess voltage circuit-breaker with a rotational disc and an electronic assembly to improve operation reliability |
| CN102930945A (en) * | 2012-10-31 | 2013-02-13 | 深圳市华力特电气股份有限公司 | Assembling method and device for spring-shaped resistor chip |
| WO2016155320A1 (en) * | 2015-03-30 | 2016-10-06 | 华为技术有限公司 | Charger, terminal device, and charging system |
| CN107146716A (en) * | 2017-06-26 | 2017-09-08 | 中国科学技术大学 | A kind of motor-driven multiple high-voltage capacitor charge and discharge switch |
-
2019
- 2019-07-23 CN CN201910665125.9A patent/CN110429925B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE387497B (en) * | 1975-06-19 | 1976-09-06 | Ericsson Telefon Ab L M | PULSE GENERATOR |
| US4041417A (en) * | 1975-06-19 | 1977-08-09 | Telefonaktiebolaget L M Ericsson | Low duty cycle pulse generator using two thyristors |
| CN101261893A (en) * | 2008-04-14 | 2008-09-10 | 佛山市浦斯电子有限公司 | Heat protection pressure sensitive resistor module |
| CN102859615A (en) * | 2010-02-19 | 2013-01-02 | 依斯克拉扎斯赛特公司 | Excess voltage circuit-breaker with a rotational disc and an electronic assembly to improve operation reliability |
| WO2012171221A1 (en) * | 2011-06-17 | 2012-12-20 | Littelfuse, Inc. | Thermal metal oxide varistor circuit protection device |
| CN102930945A (en) * | 2012-10-31 | 2013-02-13 | 深圳市华力特电气股份有限公司 | Assembling method and device for spring-shaped resistor chip |
| WO2016155320A1 (en) * | 2015-03-30 | 2016-10-06 | 华为技术有限公司 | Charger, terminal device, and charging system |
| CN107146716A (en) * | 2017-06-26 | 2017-09-08 | 中国科学技术大学 | A kind of motor-driven multiple high-voltage capacitor charge and discharge switch |
Non-Patent Citations (1)
| Title |
|---|
| 1MV小型重复频率Marx发生器研制;张晋琪等;《强激光与粒子束》;20150515(第05期);全文 * |
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