CN106385244A - Fast-rise-time nanosecond high-voltage optical switch driving source - Google Patents
Fast-rise-time nanosecond high-voltage optical switch driving source Download PDFInfo
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- CN106385244A CN106385244A CN201611035570.XA CN201611035570A CN106385244A CN 106385244 A CN106385244 A CN 106385244A CN 201611035570 A CN201611035570 A CN 201611035570A CN 106385244 A CN106385244 A CN 106385244A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/537—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a spark gap
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Abstract
The present invention relates to a fast-rise-time nanosecond high-voltage optical switch driving source comprising a Blumlein PFN pulsed network circuit which comprises two sets of single simulation lines, wherein a group of single simulation lines is provided with a high-voltage DC power supply, and each group of single simulation lines comprises multi-level LC units. In the single simulation lines of the high-voltage DC power supply, the last level of LC unit far away from the high-voltage DC power supply further comprises a spark gap switch (S2) and an auxiliary charging resistor (R2 ). The inductor of the LC unit of the level is connected in series with the spark gap switch (S2), and the auxiliary charging resistor (R2) is connected in parallel with the spark gap switch (R2). The output high-voltage square wave pulse rise time and lagging edge time of the driving source are short, and the performance and service lifetime of a plasma electro-optic switch are corresponding increased. The output voltage has a voltage-multiplying function, which can greatly reduce the size and cost of the driving source system and improve the reliability of the driving source.
Description
Technical field
The present invention relates to a kind of fast rise time nanosecond high pressure electrooptical switching driving source, belong to technical field of pulse power.
Background technology
In ultra-large type Optical Maser System, the light path control of multi beam group laser is mainly opened using heavy caliber plasma electric light
Close and realize.Heavy caliber plasma electro-optical switch needs nanosecond high-voltage square-wave pulsed drive source to be driven, high-voltage square-wave arteries and veins
The electrical specifications parameter rushing driving source directly influences the optical characteristics of heavy caliber plasma electro-optical switch.Therefore, plasma
Body electrooptical switching is high to the waveform parameter index request in high-voltage square-wave pulsed drive source, especially square wave front edge time, square wave
Afterwards along important indicators such as time, waveform flat-top stability and pulse jitters.
Original heavy caliber plasma electro-optical switch driving source mainly adopts single artificial line mode, single artificial line circuit structure
Simply, it is easy to accomplish, its output voltage is the half of charging voltage.Discharge switch is in hot end, the auxiliary of discharge switch
Power supply and trigger drive unit need high_voltage isolation to power, in nanosecond pulse discharge process, because of auxiliary electric power supply
With trigger drive unit distribution capacity effect over the ground, it is also easy to produce electrion noise, causes the device of body and peripheral equipment
Damage.
Typical Blumlein PFN pulse network is to be made up of two groups of list artificial lines, and its equiva lent impedance is single artificial line
2 times, that is, it is equal to output load impedance.Due to circuit topological structure form, at load two ends because of the reflection of discharge waveform and refraction,
Output multiplication of voltage effect (for single artificial line circuit) can be produced, the voltage obtaining in load is equal to the charging electricity of input
Pressure.In Blumlein PFN pulse network, discharge switch one end altogether, in nanosecond high-voltage square-wave process of pulse discharge,
Distribution capacity causes interference less.But, in Blumlein PFN pulse network discharge process, due to nanosecond high-voltage square-wave
Change very greatly along di/dt before and after pulse, lead to output high-voltage square-wave pulse front edge and rear longer along the time.In high-voltage square-wave
In pulse front edge and the rear section along transformation period, plasma electro-optical switch leads to optical characteristics unstable because of electrical characteristic shakiness,
Plasma electro-optical switch can not normal work, and on this time period plasma electro-optical switch apply electrical power relatively
Greatly, this electrical power can be changed into plasma shutter heat energy, directly influences optical property and the life-span of plasma.Therefore,
In order to improve optical stability and the life-span of plasma, high-voltage square-wave power supply should reduce the forward position of high-voltage square-wave pulse as far as possible
Time and rear along the time.
Content of the invention
It is an object of the invention to provide a kind of fast rise time nanosecond high pressure electrooptical switching driving source, in order to solve heavy caliber etc. from
Daughter electrooptical switching driving source output high-voltage square-wave leading-edge pulse time and rear longer along the time, causes gas ions electrooptical switching
The problem that energy is unstable and service life is short.
For solving above-mentioned technical problem, the invention provides a kind of fast rise time nanosecond high pressure electrooptical switching driving source, including
Below scheme：
Scheme one：Including a Blumlein PFN pulse network loop, described Blumlein PFN pulse network loop
Including two groups of list artificial lines, one of which list artificial line is provided with high-voltage DC power supply, and it is mono- that every group of list artificial line all includes multistage LC
Unit, in the described single artificial line being provided with high-voltage DC power supply, the afterbody lc unit away from high-voltage DC power supply also includes one
Individual arrester switch (S2) and an auxiliary charging resistance (R2), the inductance of this grade of lc unit and described arrester switch (S2) string
Connection, described auxiliary charging resistance (R2) is in parallel with described arrester switch (R2).
Scheme two：On the basis of scheme one, described driving source also includes the coaxial cable for connecting its output end.
The invention has the beneficial effects as follows：On the basis of Blumlein PFN pulse network loop, HVDC will be provided with
The inductance of afterbody lc unit of single artificial line of power supply is connected with an arrester switch, and two in this arrester switch
An end auxiliary charging resistance in parallel, the Blumlein PFN pulse network after improvement within the high-voltage charging time period, fill by auxiliary
Resistance ensure that when arrester switch is off, that is, do not have larger dv/dt to change, also do not have larger pressure drop
Produce, ensure that the integrality of the slow charge circuit of high pressure simultaneously, that is, prime high-voltage DC power supply passes through this auxiliary charging resistance
It is rear stage lc unit and another group of list artificial line carries out high-voltage charging；Within the electrion time period, arrester switch plays
The effect of one copped wave, blocks the waveform forward position voltage slightly slow wave shape less than arrester switch breakdown voltage, by spark
Square wave voltage waveform forward position after gap shortens, thus improving the time parameter in waveform forward position；Rear edge in electrion waveform
Place, after voltage waveform amplitude reduces, according to load characteristic, load current drastically reduces, less than the condition of arrester switch conducting
Afterwards, end after arrester switch, have compressed further after high-voltage square-wave along the time；Efficiently solve traditional Blumlein PFN arteries and veins
Rush the output high-voltage square-wave pulse front edge and rear longer along the time causing in network loop because great output current changes
Problem, accordingly improves the performance and used life of plasma electro-optical switch, can greatly reduce the body driving origin system
Amass and cost, improve the reliability of driving source.
Brief description
Fig. 1 is the principle schematic in Blumlein PFN pulse network loop；
Fig. 2 is the major loop topology theory schematic diagram of fast rise time nanosecond high pressure electrooptical switching driving source.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 gives the principle schematic in Blumlein PFN pulse network loop, and this loop includes one group of list artificial line
And one group of single artificial line being provided with high-voltage DC power supply DC, two groups of list artificial lines all include multistage lc unit.It is being provided with high pressure
In single artificial line of dc source DC, high-voltage DC power supply DC string is located at one end of this single artificial line, distance high-voltage dc source
The farthest one-level lc unit of DC is single artificial line afterbody lc unit.The output end in Blumlein PFN pulse network loop is even
It is connected to load resistance RL, the voltage at RL two ends is output voltage U0.
On the basis of Fig. 1, Blumlein PFN pulse network loop is improved, by Blumlein PFN pulse mesh
It is provided with the inductance L3-n-1 of single artificial line afterbody lc unit of high-voltage DC power supply and an arrester switch in network loop
S2 connects, and in one auxiliary charging resistance R2 of the two ends of this arrester switch S2 parallel connection, Fig. 2 gives based on improved
The electrooptical switching driving source major loop topology theory schematic diagram in Blumlein PFN pulse network loop.Wherein, this driving source
The positive pole of high-voltage DC power supply V1 is connected with one end of charging resistor R1, the other end of charging resistor R1 and high-voltage DC power supply V1
Negative pole between be connected with discharge switch S1 and multistage lc unit.This driving source carry out exporting by coaxial cable drive etc. from
Sub- electrooptical switching, two output ends of driving source are also associated with load resistance Rz.
Just each components and parts employed in figure 2 are described in detail below.
1st, high-voltage DC power supply V1
It is charged for high-voltage square-wave pulse shaping loop using small-power high frequency voltage doubling rectifier formula high-voltage DC power supply V1,
This dc source has the advantages that small volume, control are simple and control accuracy is high.
2nd, charging resistor R1
Charging resistor R1 adopts glass glaze RI80 high-tension resistive, and it is little, resistance to that this type resistance has high pressure, series equivalent inductance
Power rush ability is strong and steady performance.
3rd, discharge switch S1
Discharge switch S1 selects hydrogen thyratron half control type device VE4141, and it is big that such switch has high pressure, peak point current
The advantages of little with triggering shake.
4th, oscillating capacitance, inductance
Oscillating capacitance in all lc units all using the capacitor little from high withstand voltage type series equivalent inductance, such as polyester
Thin film capacitor or ceramic capacitor, the series equivalent inductance value of capacitor controls below more than ten nanohenrys, beneficial to raising square wave
Impulse waveform index.
Vibration inductance in all lc units all using hollow inductance, this hollow inductance have full frequency band frequency characteristic good,
The advantages of parameter adjustment facilitates.
5th, arrester switch S2
Arrester switch S2 can effectively reduce Blumlein PFN pulse network loop export square-wave pulse forward position and
Afterwards along the time, significantly improve the time index characteristic of output square-wave pulse, improve the use longevity of plasma electro-optical switch
Life.
6th, auxiliary charging resistance R2
By the auxiliary charging resistance R2 of one kilohm of level of arrester switch S2 two ends parallel connection, both ensure that Blumlein
PFN pulse network loop charge function is realized, and ensure that discharge time characteristic again.
7th, coaxial cable
Coaxial cable port adopts coaxial quick connector, to improve interface dielectric level, is easy between driving source and load
Connection.
In the present embodiment, driving source output impedance is 12.5 Ω, and output voltage is -21kV, exports pulse current peak
For 1.7kA about, nanosecond pulse peak power is more than 36MW.In driving source, the method for the concrete value of each components and parts is such as
Under：
1) square-wave pulse leading edge time is exported according to driving source, in conjunction with the standard parameter value of capacitor, first initial estimate
Intend capacitance C of the single-unit capacitor of selectioni.When waveform leading edge time is less it is desirable to the time constant of the lc unit of single-unit
Little, the capacitance selection of capacitor is smaller can more preferably to realize leading edge time.For example, impulse waveform leading edge time design load
During for 40ns, capacitance C of single-unit capacitori1000pF can be selected.
2) the output characteristics impedance Z according to driving source, such as：Impedance is 12.5 Ω, in conjunction with formula (1), primary Calculation single-unit
Inductance value L of inductancei, the expression formula of wherein formula (1) is：
Wherein, L represents the total inductance value of every group of artificial line, and C represents the total capacitance value of every group of artificial line.In conjunction with nanosecond side
The demand of wave impulse, inductance value is generally more than ten to tens nanohenrys.
3) export the time requirement of square wave pulse width T according to driving source, in conjunction with formula (2), the series of primary Calculation lc unit
n.Check the result of series connection series n, if too big or too little, repeat step above, choosing value calculates again.Wherein formula (2)
Expression formula is：
4) calculate the total capacitance value C in every group of artificial line.
5) the repeated work frequency that driving source requires, rational charge constant τ of every group of artificial line of calculating are combined.
6) according to charge constant τ and total capacitance value C, in conjunction with formula τ=RC, calculate the resistance value of charging resistor R1.
According to loop stress levels and parameter, from the corresponding resistance model of RI80 type.
7) charging current according to every group of artificial line charge circuit and charging voltage, determines the ginseng of high-voltage DC power supply V1
Number.
8) operation voltage of arrester switch S2 is tentatively adjusted to 15kV, after carried out according to Real output waveform shape
Fine setting.
9) resistance value of the auxiliary charging resistance R2 in parallel of arrester switch S2 is chosen as 10k Ω, neither affects discharge wave
Shape, ensure that charging interval characteristic again.In different situations, operating frequency and the discharge time of driving source can be considered
Specifically to select the resistance of R2, typically in k Ω grade.
10) standard coaxial cable that output coaxial cable is 50 Ω using characteristic impedance, using 4 parallel connections, realizes 12.5
Ω characteristic impedance coupling requires, and transmits, to reduce nanosecond high-voltage square-wave pulse, the waveform causing because of impedance mismatch in the cable
Reflection and relaxation phenomenon.Coaxial cable port adopts coaxial quick connector, to improve the dielectric level of interface, is easy to driving source
Connection and between load.
The type selecting of each components and parts above-mentioned and parameter value, only as a kind of specific embodiment, are meeting the feelings of demand
Under condition, correspondingly can be adjusted according to actual conditions.
Fast rise time nanosecond, the operation principle of high pressure electrooptical switching driving source was as follows：
High-voltage DC power supply V1 is charged for two groups of list artificial lines by charging resistor R1.Two groups of list artificial lines have charged
Cheng Hou, external circuit controls triggering discharge switch S1 conducting, and the oscillating capacitor in single artificial line passes sequentially through discharge switch S1
Resonant discharge.When discharge waveform forward position reaches at the arrester switch S2 of series connection, because arrester switch S2 is in disconnection shape
State, voltage low waveform cut-off in waveform forward position is it is impossible to pass through arrester switch.Open when harmonic wave voltage magnitude exceedes gap
During the conducting voltage of pass S2, arrester switch is forced to puncture conducting, and electrion square wave advances to next stage lc unit successively.?
Electrion waveform reaches at coaxial cable wiring, because change in the instantaneous impedance, two groups of symmetrical list artificial line superposition square waves discharge, and fold
Plus after discharge voltage square wave transmitted to load-side by coaxial cable, drive plasma electro-optical switch, thus completing one
Discharge cycles.
In above-mentioned charging process, auxiliary charging resistance R2 ensure that when arrester switch is off both do not had
There is larger dv/dt to change, also do not have larger pressure drop to produce, ensure that the integrality of the slow charge circuit of high pressure, that is, simultaneously
Prime high-voltage DC power supply is rear stage lc unit by this auxiliary charging resistance and another group of list artificial line carries out high-voltage charging.
In above-mentioned discharge process, arrester switch S2 serves the effect of a copped wave, hitting less than arrester switch
The waveform forward position voltage slightly slow wave shape wearing voltage is blocked, and the square wave voltage waveform forward position after arrester switch S2 shortens, from
And improve the time parameter in waveform forward position.In the Hou Yanchu of electrion waveform, after voltage waveform amplitude reduces, according to load
Characteristic, load current drastically reduces, and after the condition less than arrester switch S2 conducting, arrester switch S2 ends, and presses further
Contract after high-voltage square-wave along the time.Arrester switch S2 both ensure that the circuit advantage of typical Blumlein PFN pulse network,
The high-voltage square-wave of steepness Blumlein PFN pulse network output simultaneously, further improves Pulse High Voltage output and refers to
Mark.
By experimental verification, on the premise of not changing square-wave pulse waveform quality, the fast rise time nanosecond in the present invention is high
The waveform leading edge time of the high-voltage square-wave pulse that piezoelectricity photoswitch driving source is exported is 30ns～40ns, after waveform along the time is
60ns～70ns.
Claims (2)
1. a kind of fast rise time nanosecond high pressure electrooptical switching driving source, including a Blumlein PFN pulse network loop, described
Blumlein PFN pulse network loop includes two groups of list artificial lines, and one of which list artificial line is provided with high-voltage DC power supply, often
The single artificial line of group all includes multistage lc unit it is characterised in that in the described single artificial line being provided with high-voltage DC power supply, away from height
The afterbody lc unit of pressure dc source also includes an arrester switch (S2) and an auxiliary charging resistance (R2), this level
The inductance of lc unit is connected with described arrester switch (S2), described auxiliary charging resistance (R2) and described arrester switch (R2)
In parallel.
2. fast rise time nanosecond according to claim 1 high pressure electrooptical switching driving source it is characterised in that described driving source also
Including the coaxial cable for connecting its output end.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712745A (en) * | 2017-03-28 | 2017-05-24 | 中国工程物理研究院流体物理研究所 | Composite high voltage pulse electric field, and electric field sterilization device and method |
| CN107257209A (en) * | 2017-07-17 | 2017-10-17 | 中国科学技术大学 | A kind of high-voltage nanosecond pulse trigger applied to hydrogen thyratron |
| CN108900178A (en) * | 2018-06-13 | 2018-11-27 | 中国工程物理研究院应用电子学研究所 | A kind of compound long pulse formation network |
| CN109802657A (en) * | 2019-03-13 | 2019-05-24 | 中国工程物理研究院应用电子学研究所 | A kind of PFN shaping module for Marx generator and its fixed device |
| CN109936345A (en) * | 2017-12-18 | 2019-06-25 | 中国科学院大连化学物理研究所 | Pulse-modulator high-pressure compensating device and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712745A (en) * | 2017-03-28 | 2017-05-24 | 中国工程物理研究院流体物理研究所 | Composite high voltage pulse electric field, and electric field sterilization device and method |
| CN106712745B (en) * | 2017-03-28 | 2023-08-04 | 中国工程物理研究院流体物理研究所 | Composite high-voltage pulse electric field, electric field sterilization device and method |
| CN107257209A (en) * | 2017-07-17 | 2017-10-17 | 中国科学技术大学 | A kind of high-voltage nanosecond pulse trigger applied to hydrogen thyratron |
| CN109936345A (en) * | 2017-12-18 | 2019-06-25 | 中国科学院大连化学物理研究所 | Pulse-modulator high-pressure compensating device and method |
| CN108900178A (en) * | 2018-06-13 | 2018-11-27 | 中国工程物理研究院应用电子学研究所 | A kind of compound long pulse formation network |
| CN108900178B (en) * | 2018-06-13 | 2022-05-31 | 中国工程物理研究院应用电子学研究所 | Composite long pulse forming network |
| CN109802657A (en) * | 2019-03-13 | 2019-05-24 | 中国工程物理研究院应用电子学研究所 | A kind of PFN shaping module for Marx generator and its fixed device |
| CN109802657B (en) * | 2019-03-13 | 2023-03-28 | 中国工程物理研究院应用电子学研究所 | PFN forming module for Marx generator and fixing device thereof |
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