CN205265644U - Quasi -square wave impulse generator based on single section charge network and single section modulation network - Google Patents

Abstract

The utility model relates to a quasi -square wave impulse generator, concretely relates to quasi -square wave impulse generator based on single section charge network and single section modulation network belongs to pulse power technical field. The utility model discloses the technical problem that solves is that to overcome the current required network joint number of pulse shaping network technique too much, the device volume is huge, relatively poor class of output waveform flat top stability is not enough, the utility model provides a quasi -square wave impulse generator based on single section charge network and single section modulation network, its circuit network joint number is few, the hole digging device has a simple structure, small and output waveform flat top stability is good, this generator only needs to charge to the single section network simultaneously, still can reduce the insulating requirement of condenser of the system of exchanging network, the good high voltage quasi -square wave pulse output of flat top stability has been realized, can be applied to the high power microwave, the flash of light is taken picture, the fields higher to electron beam requirements for quality such as laser research.

Description

Based on the quasi-square wave impulse generator of single-unit charging network and single-unit modulating network

Technical field

The utility model relates to a kind of quasi-square wave impulse generator, is specifically related to a kind of based on single-unit charging network and single-unit modulation netThe quasi-square wave impulse generator of network, belongs to Pulse Power Techniques field, is mainly used in the generation of high voltage quasi-square wave pulse, canBe applied to the fields such as High-Power Microwave, spark photograph, laser research.

Background technology

Pulse Power Techniques are to get in J.C.Martin and the research group thereof in Britain's atomic weapon sixties in 20th century research centerA series of technological break-through develops rapidly later. At present, in pulse power device, mainly contain two large pulse shaping technology:Pulse shaping line technology (PFL) and pulse forming network technology (PFN).

Pulse-forming line is in fact a kind of transmission line, is mainly used in forming ultrashort pulse, exists and pulse forming network is transmission lineIn line style pulse-modulator, substitute element, formed by lumped-parameter element, and there is the characteristic roughly the same with true transmission line.Pulse-forming line has the good advantage of output waveform, and adopts Blumlein line can double with respect to pulse formation lineVoltage-output, but produce high voltage quasi-square wave pulse when output that exceedes 200ns, this pulse of pulse-forming line at needsFormation technology exists the problem that volume is large, cost is expensive, in the urgent need to further solution.

Compared with pulse shaping line technology, pulse forming network technology has the advantage of following uniqueness: the one, and impedance adjustment is convenient,Only needing to change the parameter of component or arrange is adjustable impedance, range of application is expanded and reduced cost of manufacture;The 2nd, be applicable to output long pulse, this is the pulse delay effect due to component, can produce the long pulse that pulse width is several microsecondsPunching; The 3rd, energy storage density is high, is that current feed type PFN or voltage feed type PFN are situated between than the oil of PFL or waterMatter energy storage density is much higher, the developing direction of equality circuit densification, miniaturization. At present, pulse forming network is to produce lengthThe Major Technology of pulse.

Traditional pulse forming network the inductance such as mainly contains and waits capacitance network, and Guillemin network etc., but its waveform existsOvershoot, flat-top stability is general and device compactedness is poor, is difficult to meet High-Power Microwave, spark photograph, laser research etc. rightThe application that electron beam quality requirement is higher. In general, PFN will adopt five joints and above network joint number could obtain flat-topThe output of the slightly good high voltage quasi-square wave of stability, and the requirement of withstand voltage of each capacitor while needing to meet charging, certainly will cause electricityContainer volume is large and heavy. Therefore, in actual applications, too much network joint number and to the requirement of the withstand voltage aspect of capacitor oftenCan cause final pulse forming network bulky and heaviness, be difficult to meet concrete instructions for use. And minimizing network joint numberCannot obtain again desirable quasi-square wave pulse output, therefore, seek that network joint number is few, compact conformation, output waveform flat-top be stableThe good impulse generator of property has important for the densification, miniaturization and the practical development that realize high power pulse drive sourceMeaning.

Utility model content

The technical problems to be solved in the utility model be overcome the required network joint number of existing pulse forming network technology too much, device bodyThe deficiencies such as long-pending huge, output waveform flat-top less stable, have proposed a kind of based on single-unit charging network and single-unit modulating networkQuasi-square wave impulse generator, its circuit network joint number is few, and apparatus structure is simple, volume is little and output waveform flat-top good stability,This generator only need charge to single-unit network simultaneously, also can reduce the capacitor insulation requirement to modulating network, has realized flatThe high voltage quasi-square wave pulse output of top good stability, can be applied to High-Power Microwave, spark photograph, laser research etc. to electricityThe field that sub-beam quality is had relatively high expectations.

The utility model is by the following technical solutions: a kind of quasi-square wave pulse based on single-unit charging network and single-unit modulating network is sent outRaw device, described generator is by a joint charging network, joint shaping network and a main inductance L₁Composition, wherein, charging network byCapacitor C₁Form C₁Can be single high-voltage pulse capacitor or by multiple ordinary capacitor by connecting and/or composing in parallel;Shaping network is by capacitor C₂And inductance L₂Compose in parallel C₂It can be single high-voltage pulse capacitor or by multiple ordinary capacitorBy connecting and/or composing in parallel; One end of described charging network is connected with one end of shaping network, the other end of charging network withOne end (charging end) of switch connects, the other end ground connection of switch; The shaping network other end and main inductance L₁One end connect,Another termination load of main inductance.

Described capacitor C₁、C₂Capacitance and inductance L₁、L₂Inductance value true according to the pulse width of load request and characteristic impedanceFixed, design parameter can calculate according to following formula:

$\left\{\begin{array}{cc}{C}_1=0.420\frac{\mathrm{\τ}}{\mathrm{\ρ}},& C_2=0.315\frac{\mathrm{\τ}}{\mathrm{\ρ}}\\ L_1=0.309\mathrm{\ρ}\mathrm{\τ},& L_2=0.057\mathrm{\ρ}\mathrm{\τ}\end{array}\right.$

Wherein: τ is the pulse width of output quasi-square wave, the characteristic impedance that ρ is network.

The utility model has the advantage of:

1. different from traditional PFN, the pulse forming network in the utility model has only adopted single-unit network as energy-storage units,When work, only need to charge to single-unit electric capacity, and not need all capacitors all to charge.

2. the electric capacity of shaping network, in off-state in the time of charging, does not need to bear the charging high pressure of microsecond magnitude, and only need holdBe subject to the shaping voltage of nanosecond order, and it is much smaller to be carried in voltage ratio charging voltage on shaping network. Therefore, shaping capacitance instituteThe dielectric strength needing, well below traditional pulse forming network, is conducive to reduce the volume of capacitor in manufacture craft.

3. compared with traditional PFN, pulse forming network has been reduced to two joints by the utility model, greatly reduced the body of deviceAmass, can be applicable to the Compact pulsed power system of hundred nanosecond.

4. the utility model has overcome the shortcoming of traditional pulse forming network output waveform flat-top less stable, has realized flat-topThe high voltage quasi-square wave pulse output of good stability, can be applied to High-Power Microwave, spark photograph, laser research etc. to electronicsThe field that beam quality is had relatively high expectations.

Brief description of the drawings

The utility model will illustrate by embodiment and with reference to the mode of accompanying drawing, wherein:

Fig. 1 is the circuit diagram of prior art;

Fig. 2 is circuit diagram of the present utility model;

Fig. 3 is by the prior art of PSpice software emulation and two joint network output waveform comparison diagrams of the present utility model;

Wherein: 1 is the output waveform of two joint networks in prior art, and 2 is output waveform of the present utility model.

Fig. 4 is experimental provision structural representation of the present utility model;

Fig. 5 is one group of simulation and experiment comparison of wave shape figure of the present utility model;

Wherein: 8 is PSpice software emulation waveform, 9 is experiment output waveform.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, this circuit diagram be prior art adopt circuit, circuit adopt network joint number generally all five joints and withUpper, corresponding device volume and weight are huge, very inconvenient transport and practicality, cannot meet pulse power device densification,The requirement of miniaturization; Although minimizing network joint number can reduce the volume and weight of device, cannot obtain desirable quasi-square wave arteries and veinsPunching output.

As shown in Figure 2, this circuit diagram is circuit of the present utility model, and the utility model is by more piece network is reduced to two joints,While working simultaneously, only need to charge and can realize the output of quasi-square wave pulse first electric capacity. Of the present utility model based on listThe quasi-square wave impulse generator of joint charging network and single-unit modulating network, basic circuit comprises two capacitor C₁、C₂With two inductanceL₁、L₂, and two electric capacity are non-homogeneous electric capacity, two inductance are non-homogeneous inductance. The operation principle of circuit is: first pass throughHigh voltage source U_sTo capacitor C₁Charge, rear Closing Switch U has charged₁, now capacitor C₁Start circuit below to carry outElectric discharge, simultaneously also to capacitor C₂Charge. The in the situation that of load matched, work as capacitor C₁Discharge pulse peak value drops to maximumAmplitude 70% time, capacitor C₂No longer charge, now capacitor C₁And C₂Load is discharged simultaneously, two waveform phasesSuperpose mutually, formed the quasi-square wave pulse output waveform of flat-top good stability.

The capacitance of pulse forming network and inductance value are mainly true by the output pulse width of quasi-square wave and the characteristic impedance of networkFixed, concrete circuit parameter is:

$\{\begin{array}{cc}{C}_1=0.420\frac{\mathrm{\τ}}{\mathrm{\ρ}},& C_2=0.315\frac{\mathrm{\τ}}{\mathrm{\ρ}}\\ L_1=0.309\mathrm{\ρ}\mathrm{\τ},& L_2=0.057\mathrm{\ρ}\mathrm{\τ}\end{array};$

Fig. 3 is for adopting Pspice software to carry out exporting after emulation to two joint networks in prior art and two joint networks of the present utility modelThe comparison diagram of waveform. Simulation result shows, although two joint network output waveform 1 leading-edge pulse times of prior art are shorter,Flat-top poor stability, is obviously worse than output waveform 2 of the present utility model.

Fig. 4 is experimental provision structural representation of the present utility model: the utility model is by high-voltage switch gear 3, charging capacitor 4, parallel connectionInductance 5, shaping capacitance 6, main inductance 7 form. High-voltage switch gear 3 one end ground connection, the other end is connected with high voltage charging power supply; FillElectric network one end is connected with high voltage charging power supply, and the other end is connected with shaping network; One end of main inductance 7 one end and shaping networkBe connected, another termination load. Experimental provision length of the present utility model is only 500mm, and height is only 230mm, compact conformation and bodyLong-pending little. High-voltage switch gear 3 is gas switch, can be also that the switch of other types can make circuit logical as plasma shutter or otherDisconnected structure; Charging capacitor 4 and shaping capacitance 6 are ceramic condenser, and shunt inductance 5 and main inductance 7 are solenoid.

Simulate a quasi-square wave pulsewidth τ=120ns, network characteristic impedance ρ=12.5 Ω charges and single capacitor based on single capacitorThe quasi-square wave impulse generator of modulation, can show that by calculating the design parameter of this pulse forming network is as follows:C₁＝4nF,L₁＝492nH,C₂＝3nF,L₂＝85.5nH。

For verifying the characteristic of impulse generator of the present utility model, use PSpice software to carry out emulation according to the parameter of design and divideAnalyse and designed experimental provision and verify, result as shown in Figure 5. Simulation result shows, PSpice software of the present utility modelSimulation waveform 8 pulse widths are 116ns, substantially become matching status when load is 12.5 Ω, have verified the utility model design parameterCorrectness; Experiment output waveform 9 and simulation result are basically identical, thereby have proved the feasibility of this impulse generator. This reality, there is not overshoot phenomenon in, flat-top good stability shorter with the rising edge of novel output waveform.

In actual applications, adopt the quasi-square wave pulse generation based on single-unit charging network and single-unit modulating network of the present utility modelDevice, has effectively reduced the joint number of pulse forming network, has only utilized the charging of single-unit network and the modulation of single-unit network just to realize and has put downThe quasi-square wave pulse output of top good stability. This pulse forming network compact conformation, volume are little, can be applied to High-Power Microwave,The fields higher to electron beam quality requirement such as spark photograph, laser research.

Disclosed all features in this description, except mutually exclusive feature, all can combine by any way.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all new in this practicalityAny amendment of doing within the spirit of type and principle, be equal to and replace and improvement etc., all should be included in protection model of the present utility modelWithin enclosing.

Claims (5)

1. the quasi-square wave impulse generator based on single-unit charging network and single-unit modulating network, is characterized in that: described generationDevice is by a joint charging network, joint shaping network and a main inductance L₁Composition, wherein, charging network is by capacitor C₁Form, wholeL network is by capacitor C₂And inductance L₂Compose in parallel, one end of described charging network is connected with one end of shaping network, charging networkThe other end be connected with one end of switch, the other end ground connection of switch; The shaping network other end and main inductance L₁One end connect,Another termination load of main inductance;

Described capacitor C₁、C₂Capacitance and inductance L₁、L₂Inductance value true according to the pulse width of load request and characteristic impedanceFixed, design parameter can calculate according to following formula:

$\left\{\begin{array}{cc}{C}_1=0.420\frac{\mathrm{\τ}}{\mathrm{\ρ}},& C_2=0.315\frac{\mathrm{\τ}}{\mathrm{\ρ}}\\ L_1=0.309\mathrm{\ρ}\mathrm{\τ},& L_2=0.057\mathrm{\ρ}\mathrm{\τ}\end{array}\right.$

Wherein: τ is the pulse width of output quasi-square wave, the characteristic impedance that ρ is network.

2. the quasi-square wave impulse generator based on single-unit charging network and single-unit modulating network according to claim 1, its featureBe: C₁For single high-voltage pulse capacitor.

3. the quasi-square wave impulse generator based on single-unit charging network and single-unit modulating network according to claim 1, its featureBe: C₁By multiple ordinary capacitor by connecting and/or composing in parallel.

4. the quasi-square wave impulse generator based on single-unit charging network and single-unit modulating network according to claim 1, its featureBe: C₂For single high-voltage pulse capacitor.

5. the quasi-square wave impulse generator based on single-unit charging network and single-unit modulating network according to claim 1, its featureBe: C₂By multiple ordinary capacitor by connecting and/or composing in parallel.