CN101588672B - Output protection circuit of Marx trigger of double-electrode gas switch - Google Patents
Output protection circuit of Marx trigger of double-electrode gas switch Download PDFInfo
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- CN101588672B CN101588672B CN 200910022925 CN200910022925A CN101588672B CN 101588672 B CN101588672 B CN 101588672B CN 200910022925 CN200910022925 CN 200910022925 CN 200910022925 A CN200910022925 A CN 200910022925A CN 101588672 B CN101588672 B CN 101588672B
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Abstract
The invention relates to a xenon lamp pumping primary power supply of a high-power solid laser and discloses an output protection circuit of a Marx trigger of a double-electrode gas switch for use in the xenon lamp pumping primary power supply of the high-power solid laser. The output protection circuit comprises a leak resistor, a stopping condenser and a discharge gap, wherein the stopping condenser and the discharge gap are serially connected between the output end of the Marx trigger and the cathode terminal of the double-electrode gas switch; and one end of the leak resistor is connected with the common node of the stopping condenser and the discharge gap, and the other end of the leak resistor is connected with the other end of the stopping condenser or directly grounded. The output protection circuit mainly solves the problem of isolation between a pulse voltage of a xenon lamp preionization circuit and the Marx trigger for triggering the double-electrode gas switch of a main discharge circuit when a high-power xenon flash lamp is driven, ensures the mutual normal cooperation between the triggering of the double-electrode gas switch of the main discharge circuit of the high-power xenon flash lamp and the preionization of the xenon lamp, and makes the operation of the xenon flash lamp reliable.
Description
Technical field
The present invention relates to the primary source of great-power solid laser xenon flash lamp pumping, particularly the output protection circuit of the Marx trigger of two electrode gas switches in a kind of primary source that is applied to the great-power solid laser xenon flash lamp pumping.
Background technology
In the primary source system of light laser xenon flash lamp pumping, switch is responsible for energy is delivered to the high power xenon flashlamp load from energy-storage system, is the critical component of whole primary source system.The switch of at present extensive use is ignitron, but along with the development of light laser primary source system to larger energy storage, the through-current capability of ignitron can't satisfy the demands, and the self breakdown probability is larger, has been not suitable for the primary source system of larger energy storage to the high reliability request of switch.
Two electrode gas switches have advantages of that through-current capability is strong, life-span length, working stability, do not have heavy metal Hg to pollute.Two electrode gas switches need the electrode gap of a trigger impulse voltage breakdown gas switch that amplitude is high, the forward position is steep to make switch conduction in the course of the work.
When large electric current passes through xenon flash lamp, in order to prevent owing to the too fast xenon lamp that causes of Current rise speed is damaged, need to adopt a preionization pulse voltage to puncture first the long gas gap of xenon flash lamp, in xenon flash lamp, produce the plasma that high electricity is led, for the large pulse current after the hundreds of microsecond ready, after increasing the preionization process, reliability and the life-span of xenon flash lamp by large electric current the time is improved, if there is not on the other hand the preionization process, there is the conducting time-delay in xenon flash lamp, after increasing the preionization process, the conducting time-delay of xenon flash lamp exists hardly, the plasma that preionization produces is so that the xenon flash lamp after discharge is stable, and the synchronism of many xenon flash lamp discharges strengthens, and has improved the efficient of laser amplifier.Figure 1 shows that the common circuit of the two electrode gas switch great-power solid laser primary sources that do not adopt preionization technique, wherein the Marx trigger is as the trigger of two electrode gas switch ignition conductings.
Adopt preionization technique can greatly improve reliability and the life-span of high power xenon flashlamp work; if but under the effect of preionization pulse, do not take quarantine measures; as shown in Figure 1; be the power supply that produces the preionization pulse in the empty frame; after increasing the preionization pulse; because the preionization pulse is about an amplitude 40kV; other positive pulse of rising front us level; to act directly on Marx trigger output; Marx flip-flop circuit figure as shown in Figure 2; fill the 13kV left and right sides forward dc high pressure during its normal operation; after capacitance is passed through in positive preionization pulse; because capacitance voltage can not suddenly change; afterbody ball gap is born the above high-voltage pulse of 50kV and directly puncture with instantaneous; in like manner successively reverse sequence puncture of ball gap; to misoperation occur behind the fast Marx generator of the high pressure reverse-conducting and export high-voltage pulse; cause two electrode gas switches by false triggering; thereby make preionization pulse and major loop pulse be added in simultaneously on the xenon flash lamp; xenon flash lamp must explode; therefore must take to isolate accordingly the protective circuit of preionization pulse; to guarantee that two electrode gas switch triggering processes normally cooperate mutually with the preionization process of xenon flash lamp; namely increase main discharge to the time of delay of preionization pulse; so that when the conducting of main discharge gas switch; high power xenon flashlamp is still kept conducting; and the preionization switch has disconnected; preionization branch road capacitor can not be reversed the vibration of charging like this, the xenon flash lamp reliability service of large driven current density.
Summary of the invention
For two electrode gas switches of prior art MARX trigger misoperation and the not high problem of reliability that may occur in the course of the work; the object of the present invention is to provide a kind of output protection circuit of Marx trigger of two electrode gas switches; adopt this output protection circuit; can be effectively with preionization pulse and the isolation of Marx trigger, the malfuncton probability that assurance MARX trigger is low and high functional reliability.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of output protection circuit of Marx trigger of two electrode gas switches; it is characterized in that; comprise: bleeder resistance; be connected to capacitance and the discharging gap of the series connection between the cathode terminal of the output of Marx trigger and two electrode gas switches; one end of described bleeder resistance is connected to the common node of isolation capacitance and discharging gap, and the other end is connected to the other end or the direct ground connection of isolation capacitance.
Further improvement of the present invention is:
The other end of described capacitance is connected to the cathode terminal of two electrode gas switches by resonant inductance, the other end of discharging gap is connected to the output of Marx trigger.
The other end of described discharging gap is connected to the cathode terminal of two electrode gas switches by resonant inductance, the other end of capacitance is connected to the output of Marx trigger.
The output protection circuit of the Marx trigger of the present invention's two electrode gas switches compared with prior art has the following advantages:
1, adopt this Marx trigger to trigger the protective circuit of two electrode gas switches, can be so that the Marx trigger of main discharge circuit gas switch be subjected to the impact of preionization pulse voltage and mistake not to export high-voltage pulse, to guarantee that two electrode gas switch triggering conductings lag behind the preionization moment tens of xenon lamp constantly to the hundreds of microsecond, and the time length that lags behind is controllable, thereby guarantees the xenon flash lamp reliability service of large driven current density;
2, connect a discharge resistance to ground between the external series gap of employing Marx trigger and the capacitance, the residual charge that the capacitance of can releasing at short notice stores, guaranteed that Marx trigger output pulse amplitude can not reduce, thereby guaranteed the light a fire reliability of two electrode gas switches of Marx trigger.
3, adopt Marx trigger low-pressure end to connect the common ground end with the shortest distance, guarantee that the voltage of high pressure fast pulse trigger low-pressure end is zero, avoided the impact on high pressure fast pulse flip-flop operation stability.Reduced the Marx trigger to electromagnetic interference intensity on every side.
4, the main storage capacitor equivalent capacity of the employing of this Marx trigger is about 500pf～2000pf, under the prerequisite that guarantees reliable triggering two electrode gas switches, adopt less main storage capacitor can effectively reduce the output energy, thereby reduce the Marx trigger to electromagnetic interference intensity on every side; Choosing capacitance is about 500pf～2000pf, adopts less capacitance can absorb the output energy of more Marx trigger, thereby reduces the electromagnetic interference intensity that triggers the loop.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and the specific embodiments.
Fig. 1 is the common circuit figure of two electrode gas switch great-power solid laser primary energies.
Fig. 2 is the circuit theory diagrams of Marx trigger.
Fig. 3 is the application circuit with Marx trigger output protection circuit of a kind of two electrode gas switches of the present invention.
Fig. 4 is the structure chart of Marx trigger and output protection circuit among Fig. 3.
Fig. 5 is the application circuit with Marx trigger output protection circuit of another kind of two electrode gas switches of the present invention.
Fig. 6 is the structure chart of Marx trigger and output protection circuit among Fig. 5.
Among Fig. 1-Fig. 6: C2, capacitance; C3, coupling capacitance; L2, resonant inductance; R1, bleeder resistance; S, external series gap; G, common ground end; D, MARX trigger earth terminal; K, MARX trigger output sleeve pipe.
Embodiment
Embodiment 1
As shown in Figure 3, Figure 4, be the application circuit of Marx trigger output protection circuit with a kind of two electrode gas switches of the present invention.Be specially at Marx trigger output connect successively external series gap S, capacitance C2, resonant inductance L2, and be connected with the cathode terminal of two electrode gas switches; The bleeder resistance R1 that connects between the common node of capacitance and resonant inductance and the ground, bleeder resistance R1 must can hold the voltage pulse output of MARX trigger and any fault not occur; The Marx trigger has the loop of one's own by coupling capacitance C3.Coupling capacitance C3 is connected across between the earth terminal of gas switch anode and MARX trigger.Under the prerequisite that guarantees insulation distance, the connection of coupling capacitance C3 should be tried one's best compact.MARX trigger integral body places in the closed metal cavity of a coaxial configuration, adopt dry air as the working gas in insulating gas and gap, external series gap, capacitance and bleeder resistance all place the Marx trigger inner, the benefit of integrated design is like this: at first external series gap can utilize Marx trigger air pressure inside to satisfy insulating requirements, saves the trouble of at every turn inflating to external series gap; Secondly, volume is little, compact conformation.The earth terminal of MARX trigger is taken as and is guaranteeing under the condition of insulation distance on the nearest trigger shell of MARX trigger output.
After adopting the serial connection external series gap; mistake is exported high-voltage pulse so that the Marx trigger is not subjected to the impact of preionization pulse voltage; thereby the two electrode gas switch triggering processes that guarantee normally cooperate mutually with the preionization process of xenon lamp; when capacitance can arrive at the trigger impulse of nanosecond; do not affect amplitude and the steepness of trigger impulse; but behind switch conduction, the heavy current pulse of Microsecond grade is then separated by capacitance, thereby plays the effect of protection Marx trigger.Because it is very short to trigger the loop ON time, on capacitance, will leave the part residual charge, thereby reduced the service efficiency of Marx trigger, therefore, jumbo bleeder resistance of high value of output termination at capacitance arrives ground, when Marx trigger output high pressure fast pulse, do not affect amplitude and the forward position of trigger impulse; When the Marx trigger was not worked, the residual charge on the capacitance can slowly discharge by bleeder resistance again, and was ready for work next time.The Marx trigger is through behind the foregoing circuit, being connected in series a resonant inductance L2 is connected with the cathode terminal end of two electrode gas switches again, the equivalent capacity of resonant inductance L2 and two electrode gas switches produces resonance, can improve the amplitude of Marx trigger output pulse, by selecting suitable resonant inductance L2, the amplitude of trigger impulse can be risen to original 1.5～1.7 times.By coupling capacitance C3 of cross-over connection between the earth terminal of MARX trigger and gas switch anode, and with the earth terminal of MARX trigger with the shortest distance join common, can effectively reduce the transient voltage amplitude that trigger impulse produces at Marx trigger low-pressure end place, reduce the Marx trigger to electromagnetic interference intensity on every side.
The parameter selection range of output protection circuit is as follows: external series gap is inner to be non-uniform field slightly, its dc breakdown voltage is not greater than 50kV (being to be punctured by preionization to get final product), its pulse breakdown voltage is not more than 70～75kV (guaranteeing reliably to be punctured by the Marx trigger), and the inflation absolute pressure is 1～5Bar; It is 10M Ω～60M Ω that bleeder resistance is selected resistance, and capacity is 120W～200W; The low-inductive capacitor series connection that capacitance is 5400pF by four capacitances, the withstand voltage of each electric capacity is 40kV, it is the high-voltage conducting wires of 0.5～1m that resonant inductance is selected length, the withstand voltage 100～200kV of coupling capacitance, capacitance 0.5～10nf.
In the implementation column 1, bleeder resistance R1 also can be connected in parallel on the capacitance two ends, except requiring it can bear the MARX trigger voltage pulse output, also requires it to have larger capacity for the requirement of bleeder resistance, resistance value is taken as 60～100M Ω, and capacity is 200W～400W.
Embodiment 2
Such as Fig. 5, shown in Figure 6, be the application circuit of Marx trigger output protection circuit with a kind of two electrode gas switches of the present invention.Physical circuit is: at connect the successively cathode terminal of capacitance, external series gap, resonant inductance and two electrode gas switches of the output of Marx trigger; Common node between capacitance and external series gap connects common by bleeder resistance; The Marx trigger has the loop of one's own by coupling capacitance C3.The MARX trigger still adopts the used structure of application example 1, just only capacitance is placed the Marx trigger inner, external series gap and bleeder resistance are all external, and its advantage is that the Marx flip flop design is simple, cost reduces, and be convenient between external series gap and Marx trigger parameter adjustment with cooperate.
Capacitance protects Marx trigger internal circuit not to be subjected to the large the influence of peak current of energy resource system major loop when the major loop conducting, and resonant inductance can improve voltage magnitude on the external series gap by resonance before the external series gap conducting.After triggering is finished, bleeder resistance forms bleed-off circuit by the isolation resistance of Marx trigger low-pressure end, mistake is not exported high-voltage pulse to external series gap so that the Marx trigger is not subjected to the impact of preionization pulse voltage, thereby the two electrode gas switch triggering processes that guarantee normally cooperate mutually with the preionization process of xenon lamp, prevent that again the preionization pulse from causing damage in Marx trigger reverse-conducting moment to high accuracy high voltage direct current generator and light-operated 10kV pulse trigger.
The parameter of output protection circuit is selected as follows: capacitance adopts the low inductance ceramic capacitor three of capacitance 1750pf, withstand voltage 50kV and two strings to form; Bleeder resistance adopts about resistance 60M Ω; Resonant inductance is 0.5～1 meter high-voltage conducting wires; External series gap inflation absolute pressure 1～5bar, more than its self-breakdown voltage 50kV, pulse breakdown voltage is no more than 70kV; Withstand voltage 100～the 200kV of coupling capacitance, capacitance 0.5～10nf.
In the implementation column 2, bleeder resistance R1 also can be connected in parallel on the capacitance two ends, except requiring it can bear the MARX trigger voltage pulse output, also requires it to have larger capacity for the requirement of bleeder resistance, resistance value is taken as 60～100M Ω, and capacity is for being 200W～400W.
Embodiment 3
The present embodiment circuit theory diagrams are with embodiment 1, but Marx trigger master storage capacitor parameter is from 20kV, and 10nf is down to 20kV, 5nf, and the capacitance parameter is chosen as 1000pf, withstand voltage 200kV.
Because Marx trigger master storage capacitor reduces, after its output energy reduces, reduced the electromagnetic interference amplitude to other equipment of energy resource system; After increasing capacitance, when the Marx trigger is exported, reduced noise amplitudes to circuits for triggering thereby absorb multi-energy more.
The resonant inductance correspondence is reduced to the following high-voltage conducting wires of 0.4m in the present embodiment, and all the other output protection circuit parameter ranges of choice are with embodiment 1.
Embodiment 4
The present embodiment circuit theory diagrams and mounting structure be with embodiment 2, but Marx trigger master storage capacitor parameter is from 20Kv, and 10nf is down to 20kV, and 6nf is down to 500pf every straight equivalent capacity from 2625pf.
With embodiment 3, reduce main storage capacitor and capacitance after, can effectively reduce triggering the electromagnetic interference amplitude of loop and peripheral equipment.
Resonant inductance is the high-voltage conducting wires less than 0.4m in the present embodiment, and the capacitance capacitance adopts 2 withstand voltage 50kV, and electric capacity is that the low inductance ceramic capacitor of 1nf is in series, and all the other output protection circuit parameter ranges of choice are with embodiment 2.
Claims (3)
1. the output protection circuit of the Marx trigger of an electrode gas switch, it is characterized in that, comprise: capacitance and the discharging gap of the series connection between the cathode terminal of bleeder resistance, coupling capacitance, the output that is connected to the Marx trigger and two electrode gas switches, one end of described bleeder resistance is connected to the common node of capacitance and discharging gap, and the other end is connected to the other end or the direct ground connection of capacitance; Coupling capacitance is connected across between the earth terminal of gas switch anode and Marx trigger.
2. the output protection circuit of the Marx trigger of a kind of two electrode gas switches according to claim 1; it is characterized in that; the other end of described capacitance is connected to the cathode terminal of two electrode gas switches by resonant inductance, the other end of discharging gap is connected to the output of Marx trigger.
3. the output protection circuit of the Marx trigger of a kind of two electrode gas switches according to claim 1; it is characterized in that; the other end of described discharging gap is connected to the cathode terminal of two electrode gas switches by resonant inductance, the other end of capacitance is connected to the output of Marx trigger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910022925 CN101588672B (en) | 2009-06-11 | 2009-06-11 | Output protection circuit of Marx trigger of double-electrode gas switch |
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| CN 200910022925 CN101588672B (en) | 2009-06-11 | 2009-06-11 | Output protection circuit of Marx trigger of double-electrode gas switch |
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| CN101588672B true CN101588672B (en) | 2013-01-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103023462B (en) * | 2012-12-13 | 2015-02-04 | 西安电子工程研究所 | Generator for generating exponential rise pulse current |
| CN105307367B (en) * | 2015-09-14 | 2018-07-17 | 西安交通大学 | A kind of circuit and method extending two-electrode gas switch service life number |
| CN106849918B (en) * | 2017-01-23 | 2019-01-29 | 华中科技大学 | A kind of pulse pump power supply device of xenon lamp excitation high-energy laser |
| CN107026384B (en) * | 2017-05-02 | 2023-07-21 | 中国工程物理研究院激光聚变研究中心 | Xenon lamp device for pumping energy of solid laser amplifier |
| CN108390586A (en) * | 2018-04-13 | 2018-08-10 | 武汉华中华昌能源电气科技有限公司 | A kind of flash pumping laser power circuit |
| CN114421930A (en) * | 2021-12-20 | 2022-04-29 | 西北核技术研究所 | Marx generator based on photoconductive switch triggering and triggering circuit based on photoconductive switch |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311067A (en) * | 1992-06-15 | 1994-05-10 | The United States Of America As Represented By The Secretary Of The Navy | High performance pulse generator |
| CN201450658U (en) * | 2009-06-11 | 2010-05-05 | 西安交通大学 | Output protection circuit of Marx trigger of two-electrode gas switch |
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2009
- 2009-06-11 CN CN 200910022925 patent/CN101588672B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311067A (en) * | 1992-06-15 | 1994-05-10 | The United States Of America As Represented By The Secretary Of The Navy | High performance pulse generator |
| CN201450658U (en) * | 2009-06-11 | 2010-05-05 | 西安交通大学 | Output protection circuit of Marx trigger of two-electrode gas switch |
Non-Patent Citations (1)
| Title |
|---|
| 高景明 等."陡化前沿Marx发生器的阻抗特性".《强激光与粒子束》.2008,第20卷(第12期),第2105-2108页. |
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Effective date of registration: 20180808 Address after: 710077 room 10607, block C, Xi'an National Digital publishing base, 996 high tech Zone, Xi an City, Shaanxi Province. Patentee after: Xi'an Xijiao Ruili Electric Research Institute Co., Ltd. Address before: 710049 28 Xianning Road, Beilin District, Xi'an, Shaanxi Patentee before: Xi'an Jiaotong University |