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CN-122026865-A - Optical fiber transmission laser triggered multipath output fast-front high-voltage pulse generator and generating method

CN122026865ACN 122026865 ACN122026865 ACN 122026865ACN-122026865-A

Abstract

The invention provides a multi-output fast-leading-edge high-voltage pulse generator triggered by optical fiber transmission laser and a generation method thereof, which are mainly used for solving the technical problems that an electric pulse triggering mode in the existing large-scale pulse power device is required to be amplified in multiple stages, the circuit topology is complex, the operation and maintenance are difficult, and a pulse charging power supply and a charging synchronization system are required to be additionally introduced in the existing PCSS adopting pulse bias, and the use and the maintenance are complex. The optical fiber transmission laser triggered multipath output fast-leading-edge high-voltage pulse generator comprises an optical fiber transmission laser triggered gas switch and two pulse capacitors to form a fast discharge branch, and the loop size can be effectively reduced to reduce stray inductance. One end of one pulse capacitor is connected with a plurality of trigger cables in parallel, and the time sequence of the trigger pulse signals can be controlled by adjusting the length of the trigger cables, so that the trigger pulses are accurately synchronized according to the set time sequence, and the structure is simple.

Inventors

  • WANG JIACHEN
  • WANG ZHIGUO
  • WEI HAO
  • SHEN YI
  • LI PENGCHAO

Assignees

  • 西北核技术研究所

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. The multi-output fast-leading-edge high-voltage pulse generator triggered by the optical fiber transmission laser is characterized by comprising a panel (9), two insulating plates (8) vertically connected to the lower surface of the panel (9) and oppositely arranged, two pulse capacitors (1) arranged between the two insulating plates (8) and connected to the lower end of the panel (9), two high-voltage introducing electrodes (11), a trigger isolation resistor (13) connected to the lower surface of the panel (9), and an optical fiber transmission laser trigger gas switch; One end of one pulse capacitor (1) is connected with an external load through a trigger cable and used for outputting trigger pulses, one end of the other pulse capacitor (1) is connected with a grounding electrode plate (6) to be grounded, and the two high-voltage introducing electrodes (11) are respectively connected with an external positive polarity direct-current charging power supply +V dc and a negative polarity direct-current charging power supply-V dc through charging cables; The optical fiber transmission laser triggering gas switch comprises two gap gas switches (3), a direct current bias photoconductive switch and a current limiting resistor, wherein the two gap gas switches (3) are positioned below two pulse capacitors (1), the two gap gas switches (3) comprise a shell (20), an insulating inner cylinder (19) which is nested in the shell (20), two high-voltage electrodes (15) which are respectively positioned at two ends of the insulating inner cylinder (19) and a triggering electrode (17) which is arranged in the middle of the insulating inner cylinder (19), a first gap is formed between the triggering electrode (17) and one of the high-voltage electrodes (15), and a second gap is formed between the triggering electrode (17) and the other high-voltage electrode (15); One end of the current limiting resistor is connected with one end of the direct current bias photoconductive switch, and the other end of the current limiting resistor is connected with any high-voltage electrode (15), the other end of the direct current bias photoconductive switch is connected with the trigger electrode (17) and is also connected with one end of the trigger isolation resistor (13), and the other end of the trigger isolation resistor (13) is connected with an external ground end; the two high-voltage electrodes (15) are respectively and electrically connected with the other ends of the two pulse capacitors (1), the two high-voltage electrodes (15) are respectively connected with the two high-voltage introduction electrodes (11), and the two gap gas switches (3) are also provided with gas pipe interfaces (24) which are connected with external gas charging and discharging equipment through gas pipes and are used for charging and discharging the two gap gas switches (3).
  2. 2. The fiber-optic transmission laser-triggered multiplexed output fast-front high-voltage pulse generator of claim 1, wherein: The panel (9) is provided with at least one trigger cable interface (26) for connecting with the trigger cable, an optical fiber interface (28) for connecting with an optical fiber, and a gas introduction interface (30) for passing through a gas pipe; the trigger cable interface (26) is an aviation plug interface, and the trigger cable is connected with an external load through the trigger cable interface (26); the lower part of the panel (9) is immersed in transformer oil; The trigger pulse lead-out electrode plate (5) is fixedly connected with one end of the corresponding pulse capacitor (1), and hole sites which are in one-to-one correspondence with the trigger cable guide pipes (7) are arranged on the trigger pulse lead-out electrode plate (5); Two ends of the trigger cable guide tube (7) are respectively and fixedly connected in the holes on the trigger cable interface (26) and the trigger pulse leading-out electrode plate (5), and one end of the grounding electrode plate (6) is connected with an external ground end through a panel (9).
  3. 3. The fiber-optic transmission laser-triggered multiplexed output fast-front high-voltage pulse generator of claim 2, wherein: two power interfaces (25) which are correspondingly connected with the charging cable are also arranged on the panel (9), and the power interfaces (25) are aviation plug interfaces; The charging cable guide tube (10) is respectively corresponding to the two power interfaces (25) and used for the charging cable to pass through; The upper ends of the two charging cable guide pipes (10) are respectively fixedly connected to the panel (9), and the two high-voltage introducing electrodes (11) are respectively positioned at the lower ends of the two charging cable guide pipes (10).
  4. 4. The fiber-optic transmission laser-triggered multiplexed output fast-front high-voltage pulse generator of claim 3, wherein: The device also comprises a connecting component; The connecting assembly comprises two fixing hoops (4) and two connecting hoops (2), wherein the two fixing hoops (4) are respectively nested at one sides of two high-voltage electrodes (15), the two connecting hoops (2) are respectively nested at the other sides of the two high-voltage electrodes (15) and are respectively connected to the lower ends of the two pulse capacitors (1), and the two high-voltage electrodes (15) are respectively electrically connected with the other ends of the two pulse capacitors (1) through the two connecting hoops (2).
  5. 5. The optical fiber transmission laser triggered multiplexed output fast-leading-edge high voltage pulse generator of claim 4, wherein: a trigger assembly is also arranged on the shell (20); The trigger assembly comprises a trigger needle (21), a trigger sealing piece (22) and a trigger fixing piece (23), wherein the trigger needle (21) sequentially penetrates through the shell (20) and the insulating inner cylinder (19) and is electrically connected with the trigger electrode (17), the trigger needle (21) is fixed on the shell (20) through the trigger fixing piece (23), the trigger sealing piece (22) is located between the trigger fixing piece (23) and the shell (20), and the other end of the current-limiting resistor is connected with the trigger electrode (17) through the trigger needle (21).
  6. 6. The optical fiber transmission laser triggered multiplexed output fast-leading-edge high voltage pulse generator of claim 5, wherein: the panel (9) is also provided with a resistor divider interface (27) and an isolation resistor interface (29); The resistor divider (12) comprises a high-voltage arm resistor R1 and a low-voltage arm resistor R2, wherein one end of the high-voltage arm resistor R1 is connected with one end of one pulse capacitor (1), the pulse capacitor (1) is connected with an external load, one end of the low-voltage arm resistor R2 is connected with an external ground end through a panel (9), the other end of the high-voltage arm resistor R1 is connected with the other end of the low-voltage arm resistor R2, and the other end of the high-voltage arm resistor R1 is also connected with an external oscilloscope through a resistor divider interface (27) for acquiring the discharge time delay of an optical fiber transmission laser triggering gas switch; The trigger isolation resistor (13) comprises a grounding resistor Re and a sampling resistor Rs, one end of the grounding resistor Re is connected with the trigger electrode (17), the other end of the grounding resistor Re is connected with one end of the sampling resistor Rs, the other end of the sampling resistor Rs is connected with an external ground end through a panel (9), one end of the sampling resistor Rs is connected with an external oscilloscope through an isolation resistor interface (29) and is used for leading out signals and acquiring an optical fiber transmission laser trigger gas switch trigger electrode (17) potential overturning process.
  7. 7. The fiber-optic transmission laser-triggered multiplexed output fast-front high-voltage pulse generator of claim 6, wherein: Three through holes are uniformly distributed on the side wall of the trigger electrode (17), wave bead screws (18) are arranged in the through holes, and holes are engraved on the inner side wall of the insulating inner cylinder (19) and used for clamping the wave bead screws (18).
  8. 8. The fiber-optic transmission laser-triggered multiplexed output fast-front high-voltage pulse generator of claim 7, wherein: The device further comprises two charging isolation resistors and two insulating connecting rods (14), wherein one ends of the two charging isolation resistors are respectively connected with the two high-voltage introduction electrodes (11), and the other ends of the two charging isolation resistors are respectively connected with the two high-voltage electrodes (15); The two insulating connecting rods (14) are arranged at the lower ends of the insulating plates (8) and are used for connecting the two insulating plates (8).
  9. 9. A method for generating a multi-output fast-front high-voltage pulse triggered by an optical fiber transmission laser, which is based on the multi-output fast-front high-voltage pulse generator triggered by the optical fiber transmission laser as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps: 1) The nitrogen or compressed air is utilized to purge the two gap gas switches (3) for a plurality of times, and impurities in the two gap gas switches (3) are discharged; 2) Compressed air is filled into the two gap gas switches (3), the pulse capacitor (1) is charged to set voltage, and the two gap gas switches (3) resist voltage; 3) The equivalent capacitor C1 of the first gap starts to discharge, the discharge current flows through the direct current bias photoconductive switch and the current limiting resistor, the discharge starts to be discharged with a time constant t, and the time constant is as follows: t=C1·(R lim +R on ); Wherein, C1 is the capacitance value of the equivalent capacitor C1 of the first gap, R lim is the resistance value of the current-limiting resistor, and R on is the equivalent resistance value when the direct-current bias photoconductive switch is turned on; 4) The potential of the trigger electrode (17) is positive or negative and instantaneously rises, the polarity of the high-voltage electrode (15) at one end of the second gap is opposite to that of the trigger electrode (17), and the second gap is broken down by overvoltage; 5) After the overvoltage breakdown of the second gap, the polarity of the potential of the trigger electrode (17) is reversed, the polarity of the potential of the high-voltage electrode (15) at one end of the first gap is opposite to that of the potential of the trigger electrode (17), the overvoltage breakdown of the first gap is carried out, and the optical fiber transmission laser triggers the gas switch to be conducted; 6) The two pulse capacitors (1) are serially discharged, and the discharge current flows through the pulse capacitor (1) connected with the grounding electrode plate (6) and transmits the laser trigger gas switch to the other pulse capacitor (1), and the other pulse capacitor (1) outputs a trigger pulse signal.
  10. 10. The method for generating the multiplexed output fast-forward high-voltage pulse triggered by the optical fiber transmission laser according to claim 9, wherein the method comprises the following steps: The step 6) also comprises the step of monitoring a trigger pulse signal of the high voltage of the fast front edge output by the other pulse capacitor (1) through a resistor divider (12) for obtaining the discharge time delay of the optical fiber transmission laser trigger gas switch; And the turnover process of the triggering electrode potential of the optical fiber transmission laser triggering gas switch is obtained through the grounding resistor Re and the sampling resistor Rs, and the turnover process is used for judging the working state of the optical fiber transmission laser triggering gas switch.

Description

Optical fiber transmission laser triggered multipath output fast-front high-voltage pulse generator and generating method Technical Field The invention relates to a fast-forward high-voltage pulse generator and a generation method, in particular to a multi-output fast-forward high-voltage pulse generator triggered by optical fiber transmission laser and a generation method. Background The accurate synchronous triggering according to the set time sequence is one of the bottleneck problems which restrict the large-scale pulse power device at present, especially the linear transformer driving source (linear transformer driver, LTD) is applied on a large scale, and a series of requirements of high trigger pulse amplitude (more than or equal to 100 kV), fast leading edge (20 ns), accurate time sequence control, compact structure, high reliability and the like are provided for a triggering system. Various triggering modes are designed for large pulse power devices at home and abroad, including electric pulse triggering, laser triggering and triggering modes based on photoconductive switches (photoconductive semiconductor switch, PCSS). The electric pulse triggering mode is widely applied, the technology is mature, and the electric pulse triggering mode is mainly based on the principles of quick discharge of capacitance, a Marx generator, a pulse transformer and the like. See S.T.Rogowski,W.E.Fowler,M.Mazarakis,et al.Operation and performance of the first high current LTD at Sandia National Laboratories[C].IEEE Pulsed Power Conference,Monterey,2005:155-157. san Diego, U.S. laboratory designed a two-stage trigger scheme for the LTD module, controlling thyristors with control signals, and then feeding a high voltage pulse generator to achieve electrical pulse output. Referring to F.Conti,J.C.Valenzuela,V.Fadeev,et al.MA-class linear transformer driver for Z-pinch research[J].Physical Review Accelerators and Beams,2020,23(9):090401-1-090401-15.2020, conti et al proposed a single stage LTD two stage triggering scheme using a 300V solid state pulse source to trigger a high voltage pulse generator to form an electrical pulse with an amplitude of 50kV and a front 2 ns. See Yin Jiahui, wei Hao, sun Fengju, et al, fast pulse linear transformer drive source synchronous triggering system [ J ]. Intense laser and particle beam 2012,24 (4): 871-875. Northwest nuclear technology institute based on Marx generator-pulse forming line triggered main discharge switch, generating electrical pulses with amplitude of hundred kv with a leading edge of about 10 ns. See Li Xiqin, zhao Juan, wu Gongguang, et al, design of trigger source of 100kV Mini-Marx generator [ J ]. Intense laser and particle beam 2014,26 (8): 085001-1-085001-4. National institute of engineering and physics uses hydrogen thyratron to trigger Marx generator, and a high voltage pulse generator with amplitude of 100kV and front 15ns was developed. See Y.Liu,F.Lin,X.Feng,et al.Design and construction of a trigger generator based on pulse transformer for spark gap switch[J].IEEE Transactions on Plasma Science,2011,39(12):3378-3385., which uses pulse transformers to trigger gas spark switches, the university of Huazhong science and technology developed a high voltage pulse generator with an output amplitude of hundred kilovolts and a leading edge of 25 ns. It can be seen that the electric pulse triggering mode needs to amplify the electric pulse in multiple stages, the first stage is a hydrogen thyratron or a semiconductor switch, and the electric pulse generated in the first stage is fed into a gas switch or a Marx generator to acquire the electric pulse with the amplitude of hundreds of kilovolts and the front edge of tens of nanoseconds. However, the hydrogen thyristors have the defects that the hydrogen thyristors need to be powered and preheated before being used, a plurality of current sources need to be additionally provided for power supply, and when the Marx generator formed by the semiconductor switches is abnormal, the Marx generator is possibly damaged as a whole due to uneven voltage division of the switches, and the reliability is still insufficient. Therefore, the electric pulse triggering mode utilizing multistage amplification has the problems of complex circuit topology, difficult operation and maintenance and the like. See S.F.Glover,F.J.Zutavern,M.E.Swalby,et al.Pulsed and DC charged PCSS based trigger generators[C].IEEE Pulsed Power Conference,Washington,DC,2009:1444-1447. and F.J.Zutavern,S.F.Glover,M.E.Swalby,et al.DC-charged GaAs PCSSs for trigger generators and other high-voltage applications[J].IEEE Transactions on Plasma Science,2010,38(10):2708-2715. holly asian national laboratories, a number of high voltage pulse generators have been developed based on PCSS triggering Trigatron switches. However, the PCSS adopting pulse bias requires the additional introduction of a pulse charging power supply and a charging synchronization system, is complex