CN108880512B - High-power double-exponential pulse width continuous regulating circuit and regulating method - Google Patents
High-power double-exponential pulse width continuous regulating circuit and regulating method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 15
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- 238000003860 storage Methods 0.000 claims abstract description 82
- 239000003990 capacitor Substances 0.000 claims abstract description 80
- 238000012432 intermediate storage Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
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- 238000004364 calculation method Methods 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
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- 239000013256 coordination polymer Substances 0.000 description 2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a high-power double-exponential pulse width continuous regulating circuit and a regulating method. The circuit structure comprises a Marx circuit, a middle storage circuit, a peaking circuit and a load resistor; the improvement is as follows: also includes a Chop circuit; the Chop circuit comprises a Chop switch, a Chop switch trigger and a Chop resistor; the Chop switch and the Chop resistor are connected in series and then connected in parallel with a middle storage capacitor in a middle storage circuit, the output end of the Chop switch trigger is connected with a trigger electrode for triggering the Chop switch, and the resistance value of the Chop resistor is less than or equal to that of the load resistor.
Description
Technical Field
The invention relates to a pulse width continuous adjusting technology, in particular to a high-power double-exponential pulse width continuous adjusting circuit and an adjusting method.
Background
Pulse power techniques compress energy on a time scale to obtain high power pulses. To obtain the fast leading edge pulse, a two-stage compression circuit is usually adopted, namely, the Marx circuit, the middle storage circuit and the peaking circuit are used for compression.
When the storage capacitor and the load impedance of the two-stage compression circuit are determined, the pulse width parameter of the output pulse is also determined. The width of the output pulse is determined by the size of the middle storage capacitor and the size of the load impedance, the pulse width can be adjusted by changing the size of the middle storage capacitor, but the adjustment range of the pulse width by changing the middle storage capacitor to adjust the pulse width is limited, and the precision is not high.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a high-power double-exponential pulse width continuous regulating circuit and a regulating method aiming at the problems that the existing fast-leading-edge high-power double-exponential pulse generating circuit is limited in pulse width regulating range and low in regulating precision, and the application range of pulse power is widened while the pulse width regulating range and flexibility are improved.
The basic principle of the invention is as follows:
a Chop circuit is added in the existing two-stage compression circuit, and continuous and accurate adjustability of output pulses in a certain range is achieved by accurately controlling the turn-on time of a Chop switch.
The technical scheme adopted by the invention is as follows:
the invention provides a high-power double-exponential pulse width continuous regulating circuit which comprises a Marx circuit, a middle storage circuit, a peaking circuit and a load resistor, wherein the Marx circuit is connected with the middle storage circuit;
it is characterized in that: also includes a Chop circuit; the Chop circuit comprises a Chop switch, a Chop switch trigger and a Chop resistor; the Chop switch and the Chop resistor are connected in series and then connected in parallel with a middle storage capacitor in a middle storage circuit, the output end of the Chop switch trigger is connected with a trigger electrode for triggering the Chop switch, the trigger electrode receives a high-voltage output signal of the Chop switch trigger, and the resistance value of the Chop resistor is smaller than or equal to that of the load resistor.
Furthermore, the Chop switch is a high-voltage ultraviolet preionization multistage gas switch, and the high-voltage ultraviolet preionization multistage gas switch comprises a switch main gap and an ultraviolet preionization gap; when the switch works, the main gap pulse voltage is utilized to obtain the preionization voltage in the preionization gap in a coupling mode, the preionization gap is firstly punctured to enable air ionization to generate effective initial electrons in the main gap, the statistical time delay in the switch puncture process is reduced, the switch conduction is accelerated, the switch jitter is reduced, and the switch has the advantages of high working voltage, strong current capacity, small time delay jitter and the like.
Furthermore, the Marx circuit comprises a Marx capacitor, a Marx internal resistance, a Marx inductor and a Marx switch which are sequentially connected in series.
Further, the intermediate storage circuit comprises an intermediate storage capacitor, an intermediate storage inductor and an intermediate storage switch; the middle storage capacitor is connected with the Marx circuit in parallel, one end of the middle storage capacitor is grounded, and the other end of the middle storage capacitor is sequentially provided with a middle storage inductor and a middle storage switch; one end of a Chop switch in the Chop circuit is connected between the middle storage capacitor and the middle storage inductor, and the other end of the Chop switch is connected with the Chop resistor in series and then grounded.
Further, the peaking circuit comprises a peaking capacitor, a peaking switch and a peaking inductor; the peaking capacitor is connected with the middle storage circuit in parallel, and the peaking capacitor, the peaking inductor and the load resistor form a closed loop through the peaking switch.
The adjusting method based on the high-power double-exponential pulse width continuous adjusting circuit comprises the following steps of:
【1】 In the initial state, the Marx capacitor starts to charge, after the charging is finished, the Marx switch is triggered, and the Marx capacitor charges the storage capacitor by isolating the Marx inductor and the Marx internal resistor;
【2】 When the charging voltage of the middle storage capacitor reaches the peak value, the middle storage switch is triggered to be conducted, and the middle storage capacitor gives the peaking capacitor C through the middle storage inductorPCharging;
【3】 When the voltage of the peaking capacitor is equal to the upper voltage of the middle storage capacitor, the peaking switch is conducted; the middle storage capacitor and the peaking capacitor are discharged through a load resistor;
【4】 When the required pulse width is X, the Chop switch is synchronized with the Marx trigger signal according to the required pulse width, the trigger delay of the Marx trigger signal and the Chop switch is calculated, the external synchronizer accurately controls the trigger delay of the Marx trigger signal and the Chop switch, the intermediate storage capacitor is also discharged through the Chop resistor, and therefore a pulse with continuously adjustable pulse width can be obtained on the load resistor.
Further, the specific calculation formula of the trigger delay of the Marx trigger signal and the Chop switch is as follows:
T＝T1+T2+X；
X＝T3-T4
T3＝0.69CTRload
T4＝0.69CTRloadRchop/(Rload+Rchop)
wherein, T is the trigger delay of the Marx trigger signal and the Chop switch;
T1applying a high-voltage trigger signal until the Marx circuit outputs high-voltage pulse;
T2the time for charging the middle storage capacitor of the Marx circuit to the peak value;
T3pulse width for discharging the medium storage capacitor through the load resistor, wherein CTIs the capacitance of the middle storage capacitor, RloadIs the resistance value of the load resistor;
T4the pulse width of discharging of the middle storage capacitor through the load resistor and the chop resistor; rchopIs the Chop resistance value.
The invention has the beneficial effects that:
the invention provides a Chop circuit design added on the basis of the existing two-stage compression circuit, which can greatly improve the regulation range and flexibility of the output pulse width, improve the experimental efficiency, expand the application field of high-power pulse and improve the application level of the high-power pulse.
Drawings
Fig. 1 is a circuit schematic of an embodiment of the invention.
FIG. 2 is a waveform diagram of an output when the pulse width is 150ns according to an embodiment of the present invention.
FIG. 3 is a waveform diagram of an output when the pulse width is 50ns according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Examples
The invention adds the Chop circuit in the existing two-stage compression circuit, and realizes continuous and accurate adjustment of output pulses in a certain range by accurately controlling the turn-on time of the Chop switch.
As shown in fig. 1, the circuit comprises a Marx circuit, a middle storage circuit, a peaking circuit, a load resistor and a Chop circuit;
the Marx circuit comprises a Marx capacitor C which is connected in series in sequenceMarxMarx internal resistance RMarxMarx switch SMarxMarx inductor LMarx。
The middle storage circuit comprises a middle storage capacitor CTMiddle storage inductor LTAnd a middle storage switch ST(ii) a Middle storage capacitor CTIs connected with the Marx circuit in parallel and has a middle storage capacitor CTOne end is grounded, and the other end is sequentially provided with a middle storage inductor LTMiddle storage switch ST(ii) a Capacitor C is stored in Chop circuit one end accessTBetween the middle and storage inductorTAnd the other end is grounded.
The peaking circuit includes a peaking capacitor CpPeaking switch SpAnd peaking inductance Lp(ii) a Peaking capacitor CpA peaking capacitor C connected in parallel with the intermediate storage circuitpPeaking inductor LpAnd a load resistor RloadBy peaking switch SpForming a closed loop.
The Chop circuit comprising a Chop switch SChopTrigger and Chop resistor RChop(ii) a Middle storage capacitor C in Chop circuit and middle storage circuitTParallel connection (specifically: Chop switch S)ChopOne end is connected to the middle storage capacitor CTAnd middle storage inductor LTBetween the other end and the Chop resistor RChopGrounded after being connected in series) and the output end of the Chop switch Trigger and the Trigger Chop switch SChopThe Trigger electrode receives the high-voltage output signal of Trigger of Chop switch, and Chop resistor RChopResistance value of less than or equal to load resistance RloadThe resistance value of (c), in this embodiment:
CMarxabout 1.5 nF; l isMarxAbout 100 μ H; r is a hydrogen atomchopAbout 30 ohms; cpIs about 150pF, LpAbout 200 nH; rloadAbout 120 ohms.
The Chop switch is a high-voltage ultraviolet preionization multistage gas switch, and the high-voltage ultraviolet preionization multistage gas switch comprises a switch main gap and an ultraviolet preionization gap; when the switch works, the main gap pulse voltage is utilized to obtain the preionization voltage in the preionization gap in a coupling mode, the preionization gap is firstly punctured to enable air ionization to generate effective initial electrons in the main gap, the statistical time delay in the switch puncture process is reduced, the switch conduction is accelerated, the switch jitter is reduced, and the switch has the advantages of high working voltage, strong current capacity, small time delay jitter and the like.
The method for continuously adjusting the pulse width by adopting the circuit in the embodiment comprises the following steps:
(1) at initial state, Marx capacitance CmarxCharging to a certain voltage; after charging is completed, trigger SmarxSwitch, Marx capacitance passing through isolation inductance LmarxAnd Marx internal resistance RmarxCentering storage capacitor CTCharging;
(2) middle storage capacitor CTWhen the charging voltage reaches the peak value, the storage switch S is triggeredTConducting, medium storage capacitor CTThrough the middle storage inductor LTPeaking capacitor CPCharging;
(3) capacitor C when peakingPVoltage equal to the middle storage capacitor CTAt the upper voltage, peaking switch SPConducting, middle storage capacitor CTPeaking capacitor CPThrough a load resistor RloadThe leading edge of the discharging and outputting double-exponential pulse is mainly due to the peaking inductance and the peaking capacitor L of the peaking circuitPDetermining that the back edge of the output double exponential pulse is formed by a capacitor C of a middle storage loopTAnd a load resistance RloadDetermining;
(4) when the required pulse width is X, according to the required pulse width,
chop switch SChopBy synchronizing with the Marx trigger signal, the simultaneous computation of the Marx trigger signal and the Chop switch SChopThe external synchronous machine accurately controls the Marx trigger signal and the Chop switch SChopDelay triggering of the capacitor CTAlso through Chop resistor RChopDischarge, thereby loading the resistor RloadA pulse with a continuously adjustable pulse width is obtained.
Marx trigger signal and Chop switch SChopIs triggered by a specific meterThe formula is as follows:
T＝T1+T2+X；
X＝T3-T4
T3＝0.69CTRload
T4＝0.69CTRloadRchop/(Rload+Rchop)
wherein T is Marx trigger signal and Chop switch SChopThe trigger delay of (2);
T1applying a high-voltage trigger signal until the Marx circuit outputs high-voltage pulse;
T2the time for charging the middle storage capacitor of the Marx circuit to the peak value;
T3for storing a capacitor CTPulse width through load resistance, wherein CTIs the capacitance of the middle storage capacitor, RloadIs the resistance value of the load resistor;
T4the pulse width of the medium storage capacitor discharging through the load resistor and the chop resistor; rchopIs the Chop resistance value.
In the practical process, R is more than or equal to 0chop≤RloadWithin the above range, R is adjustedchopThe exact X, and thus T, is obtained.
Fig. 2 is an output waveform of a typical pulse width continuously adjustable double-exponential pulse generation method according to an embodiment of the present invention, and the feasibility of the method is verified through circuit simulation results. The output pulse width is typically 150ns as shown in fig. 2, and 50ns as shown in fig. 3. As can be seen from fig. 2 and 3, under the condition of outputting the same voltage, the Chop circuit is adopted to accurately control the time delay of the Marx trigger system and the Chop circuit so as to realize the regulation function.
The present invention has been described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that the detailed description of the invention is not limited to the specific embodiments shown and described. Any modification based on the idea of the invention falls within the scope of the claims.
Claims (4)
1. A high-power double-exponential pulse width continuous regulating circuit comprises a Marx circuit, a middle storage circuit, a peaking circuit and a load resistor; the method is characterized in that:
also includes a Chop circuit; the Chop circuit comprises a Chop switch, a Chop switch trigger and a Chop resistor; the Chop switch and the Chop resistor are connected in series and then connected in parallel with a middle storage capacitor in a middle storage circuit, the output end of the Chop switch trigger is connected with a trigger electrode for triggering the Chop switch, and the resistance value of the Chop resistor is less than or equal to that of the load resistor;
the Chop switch is a high-voltage ultraviolet preionization multistage gas switch, and the high-voltage ultraviolet preionization multistage gas switch consists of a switch main gap and an ultraviolet preionization gap;
the specific process for realizing the continuous adjustment of the double-exponential pulse width by the circuit is as follows:
【1】 In the initial state, the Marx capacitor starts to charge, and after the charging is finished, the Marx switch is triggered, so that the Marx capacitor charges the storage capacitor through the Marx inductor and the Marx internal resistance;
【2】 When the charging voltage of the middle storage capacitor reaches the peak value, the middle storage switch is triggered to be conducted, and the middle storage capacitor gives the peaking capacitor C through the middle storage inductorPCharging;
【3】 When the voltage of the peaking capacitor is equal to the upper voltage of the middle storage capacitor, the peaking switch is conducted; the middle storage capacitor and the peaking capacitor are discharged through the load resistor;
【4】 When the required pulse width is X, according to the required pulse width, the Chop switch synchronizes with the Marx trigger signal and calculates the trigger delay of the Marx trigger signal and the Chop switch at the same time, and the external synchronizer accurately controls the trigger delay of the Marx trigger signal and the Chop switch to enable the intermediate storage capacitor to discharge through the Chop resistor, so that a pulse with continuously adjustable pulse width can be obtained on the load resistor;
the specific calculation formula of the trigger delay of the Marx trigger signal and the Chop switch is as follows:
T＝T1+T2+X；
X＝T3-T4
T3＝0.69CTRload
T4＝0.69CTRloadRchop/(Rload+Rchop)
wherein, T is the trigger delay of the Marx trigger signal and the Chop switch;
T1applying a high-voltage trigger signal until the Marx circuit outputs high-voltage pulse;
T2the time for charging the middle storage capacitor of the Marx circuit to the peak value;
T3pulse width for discharging the medium storage capacitor through the load resistor, wherein CTIs the capacitance of the middle storage capacitor, RloadIs the resistance value of the load resistor;
T4the pulse width of discharging of the middle storage capacitor through the load resistor and the chop resistor; rchopIs the Chop resistance value.
2. The high power bi-exponential pulse width continuous modulation circuit of claim 1, wherein: the Marx circuit comprises a Marx capacitor, a Marx internal resistance, a Marx inductor and a Marx switch which are sequentially connected in series.
3. The high power bi-exponential pulse width continuous conditioning circuit of claim 2, wherein: the middle storage circuit comprises a middle storage capacitor, a middle storage inductor and a middle storage switch; the middle storage capacitor is connected with the Marx circuit in parallel, one end of the middle storage capacitor is grounded, and the other end of the middle storage capacitor is sequentially provided with a middle storage inductor and a middle storage switch; one end of a Chop switch in the Chop circuit is connected between the middle storage capacitor and the middle storage inductor, and the other end of the Chop switch is connected with the Chop resistor in series and then grounded.
4. The high power bi-exponential pulse width continuous modulation circuit of claim 3, characterized in that: the peaking circuit comprises a peaking capacitor, a peaking switch and a peaking inductor; the peaking capacitor is connected with the middle storage circuit in parallel, and the peaking capacitor, the peaking inductor and the load resistor form a closed loop through the peaking switch.
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| CN110380712A (en) * | 2019-07-03 | 2019-10-25 | 西北核技术研究院 | The Pulsed current injection source circuit that Double exponential pulse high current amplitude continuously adjusts |
| CN111721984B (en) * | 2020-05-12 | 2023-04-18 | 西北核技术研究院 | Multi-parameter program-controlled adjustable double-exponential-wave pulse current injection device |
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