CN205453646U - Two digital circuit magnetism pulse generator that indicate of high efficiency - Google Patents
Two digital circuit magnetism pulse generator that indicate of high efficiency Download PDFInfo
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- CN205453646U CN205453646U CN201620269584.7U CN201620269584U CN205453646U CN 205453646 U CN205453646 U CN 205453646U CN 201620269584 U CN201620269584 U CN 201620269584U CN 205453646 U CN205453646 U CN 205453646U
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Abstract
The utility model discloses a two digital circuit magnetism pulse generator that indicate of high efficiency relates to the circuit technical field who is used for producing the electric pulse. Pulse generator includes DC power supply, trigger circuit and marx circuit, DC power supply's output respectively with the power input end of trigger circuit and marx circuit is connected, trigger circuit's output through the opto -coupler with the signal input part of marx circuit connects, the output of marx circuit does pulse generator's pulse signal output. Pulse generator output voltage peak value, pulse width, pulse front edge optional, small, the stability is high, efficient, repetition rate is high, convenient to use.
Description
Technical field
This utility model relates to produce the circuit engineering field of electric pulse, particularly relates to the double index electromagnetic pulse generating means of a kind of high efficiency.
Background technology
Through simulating conduction and two kinds of conflicting modes of radiation frequently with injection method and irradiation method in electromagnetic compatibility effect experiment, and assess the electromagnetic immunity/sensitivity of the electronic equipment in weaponry or device with this, double indexes are directly injected into tested device, circuit or device port along simulation interference sources such as electromagnetic pulses by injection method exactly soon.The advantage of injection method is that experimental condition and step are simple, and the source using power relatively low just can make Device under test obtain certain magnitude of voltage and energy value；Furthermore, relative to irradiation method, the uncertain factor of injection method is little, and therefore the comparison of result of the test and the reproducibility of result of the test can obtain good guarantee every time；And, use the more convenient voltage to tested device internal circuit key node of injection method or current waveform to be monitored.Therefore, injection method is by an important means of weaponry effect study, and the premise of result of the test correctness it is to ensure that as the pouring-in pair of fast rising pulse source of index of high stability, therefore, the pouring-in Double exponential pulse generator developing a kind of high stability has important military significance.
Marx circuit is exactly that multistage storage capacitor is charged by power sources in parallel, then connects to load discharge.Due to its charged in parallel, discharged in series mechanism, so having outstanding advantages, can obtain higher output pulse with relatively low supply voltage, its voltage peak can be far above supply voltage.And use ambipolar Marx circuit structure owing to discharge respectively towards two loads, so voltage pulse output peak value halves, efficiency is low, want the output pulse of output HIGH voltage peak value, the progression needed is multiplied, and progression increase the length that will certainly increase Marx circuit, the stability exporting pulse is declined accordingly, increase the volume of pulse generating unit, additionally, repetition rate is switched by snowslide pipe and is limited, traditional pulse source is used to be difficult to obtain higher repetition rate, and repetition rate is by an important index in galvanomagnetic-effect experiment, repetition rate is the highest, build-up effect is the most serious, effect test effect is the most obvious, therefore, need to change the structure of Marx circuit, improve its delivery efficiency and repetition rate.
Utility model content
Technical problem to be solved in the utility model is to provide the double index electromagnetic pulse generating means of a kind of high efficiency, described pulse generating unit output voltage peak value, pulse width, pulse front edge are optional, and volume is little, degree of stability is high, efficiency is high, repetition rate is high, easy to use.
For solving above-mentioned technical problem, technical solution adopted in the utility model is: the double index electromagnetic pulse generating means of a kind of high efficiency, it is characterized in that: include DC source, trigger circuit and Marx circuit, the outfan of described DC source power input with described triggering circuit and Marx circuit respectively is connected, the outfan of described triggering circuit is connected through the signal input part of optocoupler with described Marx circuit, the pulse signal output end that outfan is described pulse generating unit of described Marx circuit.
nullFurther technical scheme is: described DC source includes transformator U1、Electric capacity C11-C15 and diode D11-D14，The input termination alternating current of transformator U1，One outfan of transformator U1 is connected with one end of electric capacity C11，The other end of electric capacity C11 is connected through the negative pole of electric capacity C13 with diode D14，The positive pole of diode D14 is successively through electric capacity C14、After electric capacity C12, another outfan with transformator U1 is connected，The positive pole of diode D11 and the negative pole of diode D12 connect the node of electric capacity C11 and electric capacity C13，The negative pole of diode D11 connects the node of electric capacity C12 and transformator U1，The positive pole of diode D12 and the negative pole of diode D13 connect the node of electric capacity C12 and electric capacity C14，The cathode output end that node is described DC source of transformator U1 and electric capacity C12，The cathode output end that node is described DC source of electric capacity C14 and diode D14，Described electric capacity C15 is connected in parallel on the outfan of described DC source.
Further technical scheme is: described triggering circuit includes that the first order triggers circuit and circuit is triggered in the second level, the described first order triggers circuit and includes NE555 intervalometer U2 and shaping chip U3, described U3 uses 74LS123, the 1 foot ground connection of described U2,2 feet of described U2 are divided into two-way, the first via is through resistance R21 ground connection, and the second tunnel is triggered switch S21 ground connection；3 feet of described U2 are connected with 2 feet of described U3；4 feet of described U2 connect power supply；The 5 foot meridian capacitor C21 ground connection of described U2；6 feet of described U2 are divided into three tunnels, and the first via connects power supply through electric capacity C22 ground connection, the second tunnel through resistance R22, and the 3rd tunnel is connected with 7 feet of described U2；8 feet of described U2 connect power supply；The 1 foot ground connection of described U3；3 feet of described U3 connect power supply；Being divided into two-way, the first via to be connected with 15 feet of described U3 after the 14 foot meridian capacitor C23 of described U3, the second tunnel connects power supply through resistance R23；Being divided into two-way after the 13 foot meridian capacitor C24 of described U3, the first via is the outfan that the described first order triggers circuit, and the second tunnel is through resistance R24 ground connection, and other pin of described U3 is unsettled；
The described second level is triggered circuit and is included audion Q21, the input of outfan and second level triggering circuit that the described first order triggers circuit is connected, the described second level is triggered the input of circuit and is divided into two-way, the first via is ground connection after backward diode D21, second tunnel is connected with the base stage of audion Q21, the grounded emitter of audion Q21, the colelctor electrode of audion Q21 is divided into two-way, the first via is followed by power supply through resistance R25, second tunnel is connected with one end of electric capacity C25, the other end of electric capacity C25 is divided into two-way, the first via is through electric capacity C26 ground connection, second tunnel is through resistance R26 ground connection, the signal output part that node is described triggering circuit of described electric capacity C25 and resistance R26.
Further technical scheme is: described Marx circuit includes input stage circuit, some grades of charge-discharge circuits and output-stage circuit, described input stage circuit includes audion T1, the base stage of described audion T1 is the input of described Marx circuit, the colelctor electrode of described audion T1 connects the input of first order charge-discharge circuit, the grounded emitter of described audion T1；nullDescribed every grade of charge-discharge circuit includes charging inductance L31、Electric capacity C31、Resistance R31-R32 and avalanche transistor T2，The one termination VCC of described charging inductance L31，The other end is divided into two-way after electric capacity C31，The first via is connected with the base stage of avalanche transistor T2，Second tunnel is connected with the emitter stage of avalanche transistor T2，The base stage of avalanche transistor T2 is successively through resistance R31、Ground connection after resistance R32，The input that node is every grade of charge-discharge circuit of wherein said charging inductance L31 and electric capacity C31，The outfan of the current collection of avalanche transistor T2 extremely every grade of charge-discharge circuit，Wherein，The input of the output termination second level charge-discharge circuit of first order charge-discharge circuit，The outfan of second level charge-discharge circuit is connected with the input of third level charge-discharge circuit，The like，The outfan of described n-th grade of charge-discharge circuit is connected with the input of described output-stage circuit，Wherein said output-stage circuit includes charging inductance L32、Electric capacity C32 and resistance R33-R34，One end of charging inductance L32 is the input of described output-stage circuit after merging with one end of electric capacity C32，Another termination power VCC of charging inductance L32，The other end of electric capacity C32 is divided into two-way，The first via is the outfan of described Marx circuit，Second tunnel ground connection after resistance R33-R34 successively，N is the natural number more than 3.
Further technical scheme is: described Marx circuit and triggering circuit are positioned at shielding box.
Further technical scheme is: the outfan of described Marx circuit is provided with N connector.
nullUse and have the beneficial effects that produced by technique scheme: in charge circuit，Charging inductance is used to replace the part charging resistor in tradition Marx circuit，Utilize inductance D.C. resistance low and feature that alternating-current resistance is little，Reduce DC charging time and the isolation to high-frequency pulse signal，The charging interval of circuit is limited by charging resistor，Typically require charging resistor and the product of storage capacitor that the pulse repetition period is more than five times，And in charging process, energy on charging resistor is lost can be converted to heat energy，Circuit temperature is caused to rise，Snowslide pipe hydraulic performance decline，Affect pulse recurrence frequency further，In charge circuit，Resistance is replaced by inductance，Total charging resistor can be reduced，I.e. reduce the charging interval，Owing to inductance is not belonging to dissipative cell，Pulse energy utilization ratio greatly improves，Consume energy in circuit to reduce，Circuit heat condition is improved，Improve the repetition rate of pulse source；In Marx circuit, charging inductance, storage capacitor and charging resistor all use paster to encapsulate, and further reduce the volume of impulse circuit.
In Marx circuit, all of switch all uses the avalanche transistor FMMT415 that paster encapsulates.Found by pre-stage test, novel avalanche transistor is a kind of more satisfactory device that can simultaneously provide quickly response and the biggest peak power, the avalanche effect utilizing it can make switch conduction times greatly be shortened, and stability and concordance than FMMT417 are more preferable；It addition, use paster encapsulation to reduce the volume of pulse source.
Described charging resistor uses the method for two charging resistor series connection to increase insulation distance, to prevent output voltage to be susceptible to spark discharge when increasing.The progression of described Marx circuit, supply voltage, the value of electric capacity three need to go to arrange according to different demands.In order to reduce the impact on pulse source of external electromagnetic interference source and high-voltage DC power supply, described Marx circuit is placed in shielding box, circuit ground effect so can be made more preferable, and eliminate the interference to Waveform testing device (oscillograph), waveform is the most smooth, and repeatability is more preferably.
To sum up, described pulse generating unit output voltage peak value, pulse width, pulse front edge are optional, and volume is little, degree of stability is high, efficiency is high, repetition rate is high, easy to use.
Accompanying drawing explanation
Fig. 1 is the theory diagram of pulse generating unit described in the utility model；
Fig. 2 is the schematic diagram of DC source in pulse generating unit described in the utility model；
Fig. 3 is the schematic diagram triggering circuit in pulse generating unit described in the utility model；
Fig. 4 is the schematic diagram of Marx circuit in pulse generating unit described in the utility model；
Fig. 5 is partial circuit structural representation in shielding box；
Wherein: 1, shielding box 2, N connector.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Elaborate a lot of detail in the following description so that fully understanding this utility model, but this utility model can also use other to be different from alternate manner described here to be implemented, those skilled in the art can do similar popularization in the case of this utility model intension, and therefore this utility model is not limited by following public specific embodiment.
As shown in Figure 1, the utility model discloses the double index electromagnetic pulse generating means of a kind of high efficiency, including DC source, trigger circuit and Marx circuit, the outfan of described DC source power input with described triggering circuit and Marx circuit respectively is connected, the outfan of described triggering circuit is connected with the signal input part of described Marx circuit, the pulse signal output end that outfan is described pulse generating unit of described Marx circuit.
The DC source of exportable 250V DC voltage charges to the electric capacity in Marx circuit；Trigger circuit and use one spike of output of NE555 and 74LS123 circuit structure, whole Marx circuit is turned on or off and is controlled；Output pulse is connected oscillograph by the output of Marx circuit and shows.Marx circuit and triggering circuit are placed in shielding box, shielding box is equivalent to ground, the outfan of Marx circuit is connected with the lead-out terminal of N connector, and fixing end is screwed on shielding box, thus ensure that whole pulse generating unit various piece good the most altogether.
nullFig. 2 is the schematic diagram of DC source，Described DC source includes transformator U1、Electric capacity C11-C15 and diode D11-D14，The input termination alternating current of transformator U1，One outfan of transformator U1 is connected with one end of electric capacity C11，The other end of electric capacity C11 is connected through the negative pole of electric capacity C13 with diode D14，The positive pole of diode D14 is successively through electric capacity C14、After electric capacity C12, another outfan with transformator U1 is connected，The positive pole of diode D11 and the negative pole of diode D12 connect the node of electric capacity C11 and electric capacity C13，The negative pole of diode D11 connects the node of electric capacity C12 and transformator U1，The positive pole of diode D12 and the negative pole of diode D13 connect the node of electric capacity C12 and electric capacity C14，The cathode output end that node is described DC source of transformator U1 and electric capacity C12，The cathode output end that node is described DC source of electric capacity C14 and diode D14，Described electric capacity C15 is connected in parallel on the outfan of described DC source.
This DC source is made up of four voltage doubling rectifing circuits and capacitor filter, and voltage doubling rectifing circuit is the memory action utilizing filter capacitor, multiple electric capacity and diode can obtain the output voltage times over transformer secondary voltage；In the case of zero load, the voltage at electric capacity C11 two ends isU1, using electric capacity C12 two ends as outfan, the value of output voltage is 2U1, the like, finally can obtain 4 timesnullThe output voltage of U1，In view of when after load on circuit band，Output voltage would be impossible to reach the multiple of U1 peak value，In order to enable supply voltage to reach desired output voltage，U1 is taken as 50V，All electric capacity are selected pressure for 300V、Capacity is the electrochemical capacitor of 10uF，Outfan in voltage doubling rectifing circuit is connected in parallel with a capacitor and i.e. constitutes capacitor filter，Capacitor filter utilizes filling of electric capacity、Discharge process，Make output voltage smooth-out，The effect of filtering depends on discharge time，Electric capacity Yu is big，Load resistance Yu is big，After filtering, output voltage Yu smooths，Its stability is better，Here selected pressure for 500V、Capacity is the electrochemical capacitor of 47uF，Filter capacitor Yu is big，The angle of flow of diode will be the least，So commutation diode is electric capacity charging by flowing through dash current the biggest within the of short duration time，This is the most unfavorable to life-span and the stability of diode，So the maximal integer mass flow average current of diode is had the highest requirement，Here the commutation diode having selected maximal integer mass flow average current to be 1A.This DC power supply circuit can export the VD of 250V, and the voltage wanting to realize between 180V and 260V all can be realized by the voltage of the multiple of adjustment voltage doubling rectifing circuit and transformer secondary.Owing to pulse source needs high voltage, small area analysis, DC source that degree of stability is high, the stability of DC source will directly affect flatness and the stability of the output pulse of Marx impulse circuit, by selecting bigger filter capacitor and voltage doubling rectifing circuit to achieve the indices of DC source, compare the Switching Power Supply on market, its volume have also been obtained and further reduces, and this is beneficial to the integrated and Miniaturization Design of whole pulse source system.
As shown in Figure 3, the first order that includes described triggering circuit triggers circuit and circuit is triggered in the second level, the described first order triggers circuit and includes NE555 intervalometer U2 and shaping chip U3, described U3 uses 74LS123, the 1 foot ground connection of described U2,2 feet of described U2 are divided into two-way, and the first via is through resistance R21 ground connection, and the second tunnel is triggered switch S21 ground connection；3 feet of described U2 are connected with 2 feet of described U3；4 feet of described U2 connect power supply；The 5 foot meridian capacitor C21 ground connection of described U2；6 feet of described U2 are divided into three tunnels, and the first via connects power supply through electric capacity C22 ground connection, the second tunnel through resistance R22, and the 3rd tunnel is connected with 7 feet of described U2；8 feet of described U2 connect power supply；The 1 foot ground connection of described U3；3 feet of described U3 connect power supply；Being divided into two-way, the first via to be connected with 15 feet of described U3 after the 14 foot meridian capacitor C23 of described U3, the second tunnel connects power supply through resistance R23；Being divided into two-way after the 13 foot meridian capacitor C24 of described U3, the first via is the outfan that the described first order triggers circuit, and the second tunnel is through resistance R24 ground connection, and other pin of described U3 is unsettled；
The described second level is triggered circuit and is included audion Q21, the input of outfan and second level triggering circuit that the described first order triggers circuit is connected, the described second level is triggered the input of circuit and is divided into two-way, the first via is ground connection after backward diode D21, second tunnel is connected with the base stage of audion Q21, the grounded emitter of audion Q21, the colelctor electrode of audion Q21 is divided into two-way, the first via is followed by power supply through resistance R25, second tunnel is connected with one end of electric capacity C25, the other end of electric capacity C25 is divided into two-way, the first via is through electric capacity C26 ground connection, second tunnel is through resistance R26 ground connection, the signal output part that node is described triggering circuit of described electric capacity C25 and resistance R26.
A stable rectangular pulse is produced by NE555 intervalometer, performance parameter due to NE555 itself, its pulse width minimum can only achieve us level, the audion T1 of the input stage circuit of Marx impulse circuit needs a triggering pulse to trigger, the forward position triggering pulse can produce certain impact to the stability of Marx circuit output waveform, triggers the pulsewidth requirement to be met of pulse.If triggering the pulsewidth charging interval more than Marx circuit of pulse, then it would appear that one is triggered Marx circuit multiple discharge in pulse, thus produce the situation of multiple pulse.In order to avoid the appearance of this situation, use 74LS123 shaping circuit will trigger pulse shortening so that it is less than the charging interval of Marx circuit.For reducing pulsewidth further, improving rising edge steepness, the outfan at 74LS123 shaping circuit has added peaker, and so so that the triggering signal leading edge of output is relatively steep, but amplitude is relatively low, and driving force is weak.nullOwing to the stability of impulse circuit output pulse is heavily dependent on leading-edge steepness and the driving force of triggering pulse，Therefore，Trigger in the first order and after circuit, add again second level triggering circuit，If this triggering main circuit is made up of avalanche transistor MMBT3904 and peripheral circuit，His snowslide conducting voltage is 50V，So using the DC source of 50V that it is powered here，One-level triggers pulse as its input pulse，Its concrete operation principle is: switch on power，Charge to electric capacity C25，When the switch S21 that the first order triggers circuit presses，Audion Q21 turns on，Right-hand member at electric capacity C25 produces the spike of a 50V，Again by the peaker being made up of resistance R26 and electric capacity C26，This spike is carried out further steepness，Finally one output voltage of output is 50V、Pulse front edge is the spike of 5ns，By this pulse as the triggering signal of Marx circuit，If needing to produce the triggering signal of certain repetition rate，Have only to the switch S21 short circuit triggering circuit，Revise resistance and the capacitance parameter of 555 generators as required.
Found by analysis and research, increase and trigger signal slope K, the triggering shake of pulse can be made to reduce.In order to increase triggering signal slope K, devise 2 grades of triggering patterns triggered, triggered circuit by the first order and produce a pulse that amplitude is relatively low, forward position is steeper, the input signal of circuit is triggered as the second level, triggering circuit due to the second level uses audion to be that avalanche transistor MMBT3904 is as switch, its supply voltage uses 50V, utilize avalanche theory, circuit is triggered in the second level can provide a rising edge steeper, the triggering signal that driving force is higher, can effectively improve triggering stability problem.Pass through experiment test, compared for different rising edge and trigger the result of signal, as shown in table 1 (sample size is 50 times), as can be seen from the table, if using the triggering circuit that one-level triggers and two-stage triggering combines, triggered time shake is the least, meets and provides stable triggering for MARX impulse circuit so that the output pulse stability of impulse circuit more preferably, pulse front edge steeper.
Table 1 is different triggers the signal impact on triggering degree of stability
| Trigger signal | Voltage | Rising edge | Slope K | Triggered time shake variance |
| Only one-level triggers | 5V | 35ns | 0.14V/ns | 1.51ns |
| The first order triggers and the second level is triggered | 50V | 5ns | 10V/ns | 0.017ns |
As shown in Figure 4, described Marx circuit includes input stage circuit, some grades of charge-discharge circuits and output-stage circuit, described input stage circuit includes audion T1, the base stage of described audion T1 is the input of described Marx circuit, the colelctor electrode of described audion T1 connects the input of first order charge-discharge circuit, the grounded emitter of described audion T1；nullDescribed every grade of charge-discharge circuit includes charging inductance L31、Electric capacity C31、Resistance R31-R32 and avalanche transistor T2，The one termination VCC of described charging inductance L31，The other end is divided into two-way after electric capacity C31，The first via is connected with the base stage of avalanche transistor T2，Second tunnel is connected with the emitter stage of avalanche transistor T2，The base stage of avalanche transistor T2 is successively through resistance R31、Ground connection after resistance R32，The input that node is every grade of charge-discharge circuit of wherein said charging inductance L31 and electric capacity C31，The outfan of the current collection of avalanche transistor T2 extremely every grade of charge-discharge circuit，Wherein，The input of the output termination second level charge-discharge circuit of first order charge-discharge circuit，The outfan of second level charge-discharge circuit is connected with the input of third level charge-discharge circuit，The like，The outfan of described n-th grade of charge-discharge circuit is connected with the input of described output-stage circuit，Wherein said output-stage circuit includes charging inductance L32、Electric capacity C32 and resistance R33-R34，One end of charging inductance L32 is the input of described output-stage circuit after merging with one end of electric capacity C32，Another termination power VCC of charging inductance L32，The other end of electric capacity C32 is divided into two-way，The first via is the outfan of described Marx circuit，Second tunnel ground connection after resistance R33-R34 successively，N is the natural number more than 3.
nullWhen DC source is connected，Each charging capacitor charges rapidly，Before pressing triggering switch S21，Each avalanche transistor ends，But it is in critical avalanche condition，Each charging capacitor is all filled with DC bias supplies voltage VCC，When pressing triggering switch S21，First triode T1 triggering and conducting is caused，The first order triggers the avalanche transistor T2 overvoltage conducting of circuit，Now，The first order triggers the electromotive force of the charging capacitor C31 right-hand member in circuit and triggers the electromotive force of charging capacitor C31 left end in circuit equal to the second level，It is equal to supply voltage VCC，Owing to the voltage at electric capacity two ends will not suddenly change，Therefore，In circuit is triggered in the second level, the right-hand member of charging capacitor C31 can get the moment electromotive force of 2 times of VCC，And this moment electromotive force is added between colelctor electrode and the emitting stage of the avalanche transistor T2 that the first order triggers circuit，Make the first order trigger the avalanche transistor T2 in circuit and avalanche breakdown occurs，The like，The whole snowslide of audions at different levels turns on，Now，Each charging capacitor is equivalent to series connection，Discharged over the ground by load resistance R33-R34，The last output voltage that obtains on load resistance R33-R34 is the negative pulse of n times of direct current power source voltage，In theory，Its multiple is exactly the number of charging capacitor.Due to the avalanche effect of avalanche transistor, the output pulse front edge that the repid discharge of electric capacity is formed can reach subnanosecond level, and owing to the loss of side circuit and the conducting resistance of snowslide pipe exist so that actual output crest voltage is about the 80% of Theoretical Calculation.
Marx circuit belongs to high speed circuit, it is desirable to high frequency substrate material dielectric constant is necessary little and stable, and dielectric loss must be little, and water absorption is low, pressure, thermostability, chemical resistance, impact strength, peel strength etc. also must be good.Additionally when connecting up high-frequency circuit, impedance matching is also the problem needing to consider.In order to reduce the lead-in inductance of circuit, the main circuit of whole PCB design uses wireless design, and avalanche transistor and electric capacity share same pad, and the design of this compact had both reduced circuit volume, improve again stability.Marx circuit final choice is politef sheet material (relative dielectric constant εrIt is 2.55, dielectric loss 0.002, thickness of slab 1mm), the voltage of 15kV can be born.
Charging inductance L31 uses high frequency coiling chip inductor, and inductance value is 50 μ H, and load impedance is can be at 50 Ω, supply voltage 180-260V.Charging capacitor can between 10pF 100nF value, all components and parts all use paster encapsulation, the PCB design of compact make pulse source achieve miniaturization.Finding by being continuously increased the progression of Marx circuit, it is the highest can reach 50 grades, and the supply voltage that different progression is suitable for, capacitance are different.nullThe progression of Marx circuit、Supply voltage、The value of electric capacity three is complementary，Need according to the requirement that pulse source is different being gone setting，It is it desired to export pulse front edge and pulsewidth reaches ps level，Output voltage peak value do not had requirement，So value of electric capacity will the least (the most a few ps)，Supply voltage needs the maximum reaching avalanche transistor to bear voltage，Must assure that one-level avalanche transistor can overvoltage conducting，And if requiring that pulse source has higher voltage peak，It is the most permissible that output pulse front edge and pulsewidth reach ns level，So value of charging capacitor can obtain larger，In general，Electric capacity is the biggest，Output voltage peak value is the highest，But the most to a certain extent，Output voltage peak value will no longer change，Now electric capacity can between 1000pF and 100nF value，The value of supply voltage is the most unsuitable excessive，Excessive part avalanche transistor generation thermal breakdown is caused owing to multistage Marx circuit electromotive force in snowslide turn on process adds up，Affect the working life of pulse generating unit.Therefore, when using larger capacitance, when the progression of Marx circuit reaches more than 30 grades, supply voltage ensures to reach the minimum conducting voltage of avalanche transistor.
It is the high-frequency circuit part of pulse generating unit as shown in Figure 5, in order to avoid the impact on peripheral circuit of the high-frequency circuit of this pulse generating unit, Marx circuit and triggering circuit are placed in shielding box 1, in order to prevent triggering circuit to the generation interference of Marx circuit, 1 port of photoelectrical coupler is connected at the outfan triggering circuit, the ground triggering circuit is connected to 2 ports of photoelectrical coupler, 3 ports of photoelectrical coupler connect 50V DC source, and 4 ports of photoelectrical coupler are connected to the input of Marx circuit；All of DC source the most individually have employed shielding and the process of heat radiation, it is placed on the outside of shielding box 1, additionally, the pulse source output voltage many in view of progression is higher, so having selected pressure higher N connector 2, connecting the right-hand member at shielding box and export negative pulse, the design of this isolation and shielding can effectively reduce the impact on Marx circuit of the inside and outside circuit so that the overall structure of pulse source is compacter and stable.
Claims (6)
1. the double index electromagnetic pulse generating means of high efficiency, it is characterized in that: include DC source, trigger circuit and Marx circuit, the outfan of described DC source power input with described triggering circuit and Marx circuit respectively is connected, the outfan of described triggering circuit is connected through the signal input part of optocoupler with described Marx circuit, the pulse signal output end that outfan is described pulse generating unit of described Marx circuit.
null2. the double index electromagnetic pulse generating means of high efficiency as claimed in claim 1，It is characterized in that: described DC source includes transformator U1、Electric capacity C11-C15 and diode D11-D14，The input termination alternating current of transformator U1，One outfan of transformator U1 is connected with one end of electric capacity C11，The other end of electric capacity C11 is connected through the negative pole of electric capacity C13 with diode D14，The positive pole of diode D14 is successively through electric capacity C14、After electric capacity C12, another outfan with transformator U1 is connected，The positive pole of diode D11 and the negative pole of diode D12 connect the node of electric capacity C11 and electric capacity C13，The negative pole of diode D11 connects the node of electric capacity C12 and transformator U1，The positive pole of diode D12 and the negative pole of diode D13 connect the node of electric capacity C12 and electric capacity C14，The cathode output end that node is described DC source of transformator U1 and electric capacity C12，The cathode output end that node is described DC source of electric capacity C14 and diode D14，Described electric capacity C15 is connected in parallel on the outfan of described DC source.
3. the double index electromagnetic pulse generating means of high efficiency as claimed in claim 1, it is characterized in that: described triggering circuit includes that the first order triggers circuit and circuit is triggered in the second level, the described first order triggers circuit and includes NE555 intervalometer U2 and shaping chip U3, described U3 uses 74LS123, the 1 foot ground connection of described U2,2 feet of described U2 are divided into two-way, and the first via is through resistance R21 ground connection, and the second tunnel is triggered switch S21 ground connection；3 feet of described U2 are connected with 2 feet of described U3；4 feet of described U2 connect power supply；The 5 foot meridian capacitor C21 ground connection of described U2；6 feet of described U2 are divided into three tunnels, and the first via connects power supply through electric capacity C22 ground connection, the second tunnel through resistance R22, and the 3rd tunnel is connected with 7 feet of described U2；8 feet of described U2 connect power supply；The 1 foot ground connection of described U3；3 feet of described U3 connect power supply；Being divided into two-way, the first via to be connected with 15 feet of described U3 after the 14 foot meridian capacitor C23 of described U3, the second tunnel connects power supply through resistance R23；Being divided into two-way after the 13 foot meridian capacitor C24 of described U3, the first via is the outfan that the described first order triggers circuit, and the second tunnel is through resistance R24 ground connection, and other pin of described U3 is unsettled；
The described second level is triggered circuit and is included audion Q21, the input of outfan and second level triggering circuit that the described first order triggers circuit is connected, the described second level is triggered the input of circuit and is divided into two-way, the first via is ground connection after backward diode D21, second tunnel is connected with the base stage of audion Q21, the grounded emitter of audion Q21, the colelctor electrode of audion Q21 is divided into two-way, the first via is followed by power supply through resistance R25, second tunnel is connected with one end of electric capacity C25, the other end of electric capacity C25 is divided into two-way, the first via is through electric capacity C26 ground connection, second tunnel is through resistance R26 ground connection, the signal output part that node is described triggering circuit of described electric capacity C25 and resistance R26.
4. the double index electromagnetic pulse generating means of high efficiency as claimed in claim 1, it is characterized in that: described Marx circuit includes input stage circuit, some grades of charge-discharge circuits and output-stage circuit, described input stage circuit includes audion T1, the base stage of described audion T1 is the input of described Marx circuit, the colelctor electrode of described audion T1 connects the input of first order charge-discharge circuit, the grounded emitter of described audion T1；nullDescribed every grade of charge-discharge circuit includes charging inductance L31、Electric capacity C31、Resistance R31-R32 and avalanche transistor T2，The one termination VCC of described charging inductance L31，The other end is divided into two-way after electric capacity C31，The first via is connected with the base stage of avalanche transistor T2，Second tunnel is connected with the emitter stage of avalanche transistor T2，The base stage of avalanche transistor T2 is successively through resistance R31、Ground connection after resistance R32，The input that node is every grade of charge-discharge circuit of wherein said charging inductance L31 and electric capacity C31，The outfan of the current collection of avalanche transistor T2 extremely every grade of charge-discharge circuit，Wherein，The input of the output termination second level charge-discharge circuit of first order charge-discharge circuit，The outfan of second level charge-discharge circuit is connected with the input of third level charge-discharge circuit，The like，The outfan of described n-th grade of charge-discharge circuit is connected with the input of described output-stage circuit，Wherein said output-stage circuit includes charging inductance L32、Electric capacity C32 and resistance R33-R34，One end of charging inductance L32 is the input of described output-stage circuit after merging with one end of electric capacity C32，Another termination power VCC of charging inductance L32，The other end of electric capacity C32 is divided into two-way，The first via is the outfan of described Marx circuit，Second tunnel ground connection after resistance R33-R34 successively，N is the natural number more than 3.
5. the double index electromagnetic pulse generating means of high efficiency as claimed in claim 1, it is characterised in that: described Marx circuit and triggering circuit are positioned at shielding box (1).
6. the double index electromagnetic pulse generating means of high efficiency as claimed in claim 1, it is characterised in that: the outfan of described Marx circuit is provided with N connector (2).
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| CN201620269584.7U CN205453646U (en) | 2016-04-01 | 2016-04-01 | Two digital circuit magnetism pulse generator that indicate of high efficiency |
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| CN201620269584.7U CN205453646U (en) | 2016-04-01 | 2016-04-01 | Two digital circuit magnetism pulse generator that indicate of high efficiency |
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| CN105634441A (en) * | 2016-04-01 | 2016-06-01 | 中国人民解放军军械工程学院 | High-efficiency and double-exponential electromagnetic pulse generation device |
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| CN112713797A (en) * | 2020-12-02 | 2021-04-27 | 清华大学 | Cascaded regulation nanosecond pulse power supply based on double avalanche triodes and control method thereof |
| CN113092915A (en) * | 2021-04-12 | 2021-07-09 | 北京航空航天大学 | Method for rapidly deducing electromagnetic environment adaptability boundary scene of radio frequency equipment |
| CN114665845A (en) * | 2022-03-01 | 2022-06-24 | 电子科技大学 | High-peak power pulse source based on high-voltage triggering and power synthesis |
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- 2016-04-01 CN CN201620269584.7U patent/CN205453646U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105634441A (en) * | 2016-04-01 | 2016-06-01 | 中国人民解放军军械工程学院 | High-efficiency and double-exponential electromagnetic pulse generation device |
| CN105634441B (en) * | 2016-04-01 | 2019-03-12 | 中国人民解放军军械工程学院 | High efficiency two fingers number electromagnetic pulse generating device |
| CN110880884A (en) * | 2019-11-29 | 2020-03-13 | 深圳先进技术研究院 | Output-adjustable nanosecond pulse source based on avalanche triode cascade circuit |
| CN111721984A (en) * | 2020-05-12 | 2020-09-29 | 西北核技术研究院 | Multi-parameter program-controlled adjustable double-exponential-wave pulse current injection device |
| CN112713797A (en) * | 2020-12-02 | 2021-04-27 | 清华大学 | Cascaded regulation nanosecond pulse power supply based on double avalanche triodes and control method thereof |
| CN113092915A (en) * | 2021-04-12 | 2021-07-09 | 北京航空航天大学 | Method for rapidly deducing electromagnetic environment adaptability boundary scene of radio frequency equipment |
| CN113092915B (en) * | 2021-04-12 | 2021-09-21 | 北京航空航天大学 | Method for rapidly deducing electromagnetic environment adaptability boundary scene of radio frequency equipment |
| CN114665845A (en) * | 2022-03-01 | 2022-06-24 | 电子科技大学 | High-peak power pulse source based on high-voltage triggering and power synthesis |
| CN114665845B (en) * | 2022-03-01 | 2023-12-22 | 电子科技大学 | High-peak power pulse source based on high-voltage triggering and power synthesis |
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