CN111381143A - RBDT dynamic characteristic testing device and testing method - Google Patents
RBDT dynamic characteristic testing device and testing method Download PDFInfo
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Abstract
The invention belongs to the field of power semiconductor device characteristic test, and particularly relates to a RBDT dynamic characteristic test device and a test method, wherein the device comprises the following steps: the Marx generator comprises a pulse discharge circuit of the RBDT to be detected, a charger, a first current limiting resistor and a first diode; the charger controls the charging of the Marx generator and the pulse discharging circuit; the Marx generator is connected with the RBDT to be tested in series to form a loop, and different trigger voltage pulses are output to the RBDT to be tested after charging; the first current-limiting resistor and the first diode are arranged on a loop formed by the Marx generator and the RBDT to be detected, so that the pulse circuit of the RBDT to be detected is prevented from influencing the operation of the Marx generator, and meanwhile, a switching device on the Marx generator is protected. The invention accurately obtains the waveform parameters reflecting the dynamic characteristics of the RBDT by changing the trigger voltage pulses which output different dynamic characteristics to the Marx generator in a control mode.
Description
Technical Field
The invention belongs to the field of power semiconductor device characteristic testing, and particularly relates to a RBDT dynamic characteristic testing device and a testing method.
Background
The pulse power technology is an electro-physical technology which stores energy for a long time and releases the stored energy to a load in a short time through a switching-on device to generate high-power electric pulses, and is widely applied to the fields of high-power microwaves, nuclear physical technology, sewage purification and the like; in the prior art, the energy storage mode of the pulse power generation circuit mainly comprises capacitive energy storage and inductive energy storage.
In pulse power systems, gas and liquid switches are generally used, such as spark gap, thyristor and oil-immersed switches, which have high withstand voltage and high throughflow, but are unstable, have a low lifetime and a low operating frequency. With the rapid development of semiconductor switches in recent years, more and more semiconductor switches are applied to pulse power applications such as thyristors in power electronics, insulated gate bipolar transistors. These switches have high operating frequency, stable operation and long service life, but have weak voltage resistance and low current capacity.
In order to adapt to the development of the pulse power technology, pulse power semiconductor devices specifically applied to the pulse power technology have been further researched, such as RBDT (reverse blocking diode thyristor). RBDT is a voltage triggered semiconductor device that is a two terminal device with an anode and a cathode, and no ports dedicated to triggering on or off. The trigger process of the RBDT is to apply a voltage pulse with a large rising rate to the RBDT in the positive direction, and the RBDT can be conducted in a very short time after the trigger voltage is applied. The RBDT is a semiconductor device and has the advantages of strong through-current capability, high reliability, small volume and the like.
The existing RBDT test circuit uses the voltage on a capacitor to be instantaneously applied to the RBDT after a switch is closed and conducted so as to trigger the RBDT to be turned on. Such test circuits generally cannot change some of the output voltage parameters, for example, when changing the output voltage rising rate, it cannot ensure that the output voltage peak value remains unchanged. The test circuit cannot comprehensively and accurately measure the waveform reflecting the dynamic characteristic of the RBDT and the parameters thereof.
Disclosure of Invention
The invention provides a device and a method for testing dynamic characteristics of RBDT, which are used for solving the technical problem that the existing RBDT testing circuit can not output RBDT trigger signals required by various required parameters, so that the waveform and the parameters of the dynamic characteristics of RBDT can not be comprehensively and accurately reflected.
The technical scheme for solving the technical problems is as follows: an RBDT dynamics testing apparatus, comprising: the Marx generator comprises a pulse discharge circuit of the RBDT to be detected, a charger, a first current limiting resistor and a first diode;
the charger is used for controlling the charging process of the Marx generator and the pulse discharging circuit and charging; the Marx generator is connected with the RBDT to be tested in series to form a loop and is used for outputting trigger voltage pulses with different dynamic characteristics to the RBDT to be tested after the charging; the pulse discharge circuit is used for discharging after the RBDT to be detected is triggered to be switched on by the trigger voltage pulse, a discharge current flows through the RBDT to be detected so as to analyze the dynamic characteristics of the RBDT to be detected, the first current limiting resistor and the first diode are both arranged on a loop formed by the Marx generator and the RBDT to be detected, the first diode is used for preventing the pulse discharge circuit from discharging to the Marx generator before the RBDT to be detected is switched on, and the first current limiting resistor is used for preventing a switching device inside the Marx generator from being damaged due to the fact that excessive current flows when the RBDT is switched on;
the dynamic characteristics include a rise rate, an amplitude, and a pulse width of the trigger voltage pulse.
The invention has the beneficial effects that: the testing device provided by the invention can output waveforms with different voltage rising rates under a certain peak voltage or output waveforms with different peak voltages under the same voltage rising rate by changing the control mode of the Marx generator by utilizing the principle of the Marx generator, and meanwhile, the testing device can not generate interference on the tested waveforms, and can accurately obtain waveform parameters with RBDT response dynamic characteristics. However, in the case that part of parameters of the trigger voltage waveform output by the existing test method cannot meet the requirements, for example, when the rising rate of the output voltage is changed, the output voltage of the trigger voltage waveform also changes, which is not favorable for accurately testing the dynamic characteristic of the RBDT. Therefore, the invention introduces a Marx generator, and solves the technical problem that the prior RBDT test circuit can not output the RBDT trigger signals required by various parameters, thereby leading to the incomplete and accurate reflection of the waveform and the parameters of the dynamic characteristics of the RBDT.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the Marx generator includes: the first control module comprises n first driving modules, n first switching devices, n first energy storage capacitors, a plurality of second current limiting resistors and a plurality of second diodes, wherein the n first driving modules, the n first switching devices and the n first energy storage capacitors are in one-to-one correspondence;
the first control module is used for respectively and independently sending control signals to the n first driving modules so as to drive the n first switching devices to be switched on at corresponding switching-on moments; (ii) a At each time, the first energy storage capacitors corresponding to the switched-on first switching devices are connected in series and output trigger voltage to the RBDT to be detected;
the plurality of second current limiting resistors are used for limiting the charging current of each first energy storage capacitor when the n first switching devices are all disconnected and the charger simultaneously charges the n first energy storage capacitors; in addition, after the charging and when the first switch device is switched on, the first energy storage capacitors are limited to discharge, and the first switched-on switch device is prevented from being damaged due to overlarge discharge current of the first energy storage capacitors; the plurality of second diodes are used for preventing a discharging loop circuit from being formed among the plurality of first energy storage capacitors corresponding to the plurality of first switching devices when the plurality of first switching devices are switched on, so that the control precision of the first control module is not influenced.
The invention has the further beneficial effects that: according to actual needs, the required trigger voltage amplitude is output by changing the charging voltage of each energy storage capacitor and/or the number of the switches which are turned on at each moment, and voltage pulses with required rising rate are realized by selecting the switches which are turned on in time at different trigger turn-on moments or controlling the turn-on time of each switch and the turn-on time of the switch.
Further, the pulse width of the trigger voltage pulse output by the Marx generator is larger than that of the current pulse output by the pulse discharge circuit.
The invention has the further beneficial effects that: in order to weaken the influence of the Marx generator on the result of the RBDT test, the pulse width of the voltage pulse output by the Marx generator needs to be larger than that of the current pulse output by a pulse discharge circuit in the device, so that the electromagnetic interference caused by the sudden change of the circuit to the RBDT characteristic test when all switching devices in the Marx generator are turned off can be avoided.
Further, the resistance value of the first current limiting resistor is determined based on the peak voltage and the pulse width of the trigger voltage pulse output by the Marx generator.
The invention has the further beneficial effects that: when the pulse width of the trigger voltage output by the Marx generator is large, the output end of the Marx generator needs to be connected with a resistor R in serieslimitAnd the switching device which is opened in the Marx generator after the RBDT is triggered to be opened is prevented from being damaged due to overlarge flowing current.
Further, the pulse discharge circuit includes: the second energy storage capacitor, the load resistor, the third diode and the RBDT to be detected are connected in series and form a loop; and when the second energy storage capacitor discharges, the pulse discharge circuit forms a current pulse on the load resistor.
Further, the charger includes: the second control module, the second driving module, the first charging circuit connected with each first energy storage capacitor in series, the third driving module and the second charging circuit connected with the second energy storage capacitor in series;
the second control module is used for sending a driving signal to the second driving module to conduct the first charging circuit to charge the first energy storage capacitors and sending a driving signal to the third driving module to conduct the second charging circuit to charge the second energy storage capacitors before dynamic testing.
Further, the first charging circuit includes: the second switching device, the first power supply and the third current-limiting resistor are connected in series and form a loop with each first energy-storing capacitor, wherein the second switching device is driven to be switched on by the second driving module;
the second charging circuit includes: and the third switching device, the second power supply and the fourth current-limiting resistor are connected in series and form a loop with the second energy-storing capacitor, wherein the third switching device is driven by the third driving module to be switched on.
Further, the charging voltage is determined according to the actually required trigger voltage amplitude.
Further, an interference isolation element is arranged between the first control module and each first driving module, and/or an interference isolation element is arranged between the second control module and each second driving module and/or each third driving module.
The invention also provides a RBDT dynamic characteristic testing method, which comprises the following steps:
setting the RBDT to be tested in any one of the RBDT dynamic characteristic testing devices;
controlling a Marx generator in the RBDT dynamic characteristic testing device to generate trigger pulse voltages with different dynamic characteristics to be applied to the RBDT to be tested;
and detecting whether the pulse discharge circuit in the RBDT dynamic characteristic testing device is conducted under each dynamic characteristic, and obtaining the dynamic characteristic of the RBDT to be tested based on the voltage at two ends of the corresponding RBDT which is conducted each time and the current pulse output by the pulse discharge circuit in a discharging mode.
Drawings
FIG. 1 is a schematic block diagram of an RBDT dynamic characteristics testing device provided by the present invention;
FIG. 2 is a circuit diagram of an RBDT dynamic characteristics testing device provided by the present invention;
fig. 3 is a diagram of trigger signals of first switching devices of each stage of a 5-stage Marx generator in an RBDT dynamic characteristic testing apparatus according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
An RBDT dynamics testing apparatus, as shown in fig. 1, includes: the Marx generator comprises a pulse discharge circuit of the RBDT to be detected, a charger, a first current-limiting resistor and a first diode;
the charger is used for controlling the charging process of the Marx generator and the pulse discharging circuit and charging; the Marx generator is connected with the RBDT to be tested in series to form a loop and is used for outputting trigger voltage pulses with different dynamic characteristics to the RBDT to be tested after charging; the pulse discharge circuit is used for discharging after the RBDT to be detected is triggered to be switched on by the trigger voltage pulse, the discharge current flows through the RBDT to be detected so as to analyze the dynamic characteristics of the RBDT to be detected, the first current limiting resistor and the first diode are both arranged on a loop formed by the Marx generator and the RBDT to be detected, the first diode is used for preventing the pulse discharge circuit from discharging to the Marx generator before the RBDT to be detected is switched on, and the first current limiting resistor is used for preventing a switching device in the Marx generator from being damaged due to the fact that overlarge current flows when the RBDT is switched on;
the dynamic characteristics include a rise rate, an amplitude, and a pulse width of the trigger voltage pulse.
By using the principle of a Marx generator and changing the control mode of the Marx generator, output waveforms with different voltage rising rates under a certain peak voltage or output waveforms with different peak voltages under the same voltage rising rate can be output, meanwhile, a testing device cannot generate interference on the tested waveforms, and waveform parameters of RBDT response dynamic characteristics can be accurately obtained. However, in the case that part of parameters of the trigger voltage waveform output by the existing test method cannot meet the requirements, for example, when the rising rate of the output voltage is changed, the output voltage of the trigger voltage waveform also changes, which is not favorable for accurately testing the dynamic characteristic of the RBDT. Therefore, the invention introduces a Marx generator, and solves the technical problem that the prior RBDT test circuit can not output the RBDT trigger signals required by various parameters, thereby leading to the incomplete and accurate reflection of the waveform and the parameters of the dynamic characteristics of the RBDT.
Preferably, as shown in fig. 2, an RBDT dynamic characteristics testing apparatus includes: the device comprises a Marx generator, a pulse discharge circuit of the RBDT to be detected, a charger and a peripheral circuit.
The charger part includes: energy storage capacitor C for Marx generator in parallel connection1-CnCharged DC voltage source DC1Resistance R0Switching device T1And T1Drive module, control module 2, and energy storage capacitor C for pulse discharge circuit0Charged DC voltage source DC2Resistance R21Switching device T2And T2And a driving module.
Wherein, the energy storage capacitor C1-CnNamely the n first energy storage capacitors and the DC voltage source DC1Namely the first power supply, a resistor R0I.e. the aforementioned third current-limiting resistor, the switching device T1I.e. the aforementioned second switching device, T1The driving module is the second driving module, the control module 2 is the second control module, and the energy storage capacitor C0Namely the second energy storage capacitor, DC voltage source DC2Namely the second power supply, a resistor R21Namely the fourth current-limiting resistor and the switching device T2I.e. the aforementioned third switching device, T2The driving module is the third driving module.
The Marx generator comprises: a plurality of similar dotted frames are formed by capacitors C2、MOSFET S2Diode D24And a resistance R3Formed module and capacitor CnResistance R2n+1、MOSFET SnThe driving module (driving module 1-driving module n) of each stage of switch and the control module 1. Each stage of switching device in the Marx generator is provided with a respective driving module, each driving module receives mutually independent control signals, and the control signals are output by the control module 1. DC (direct current)1、R0And T1Charging circuit, switching device T forming a Marx generator1From T1And the driving module drives and receives the control signal output by the control module 2. The Marx generator is used for outputting a trigger voltage pulse signal of the RBDT.
Wherein, the capacitor C2-a capacitance CnNamely the first energy storage capacitor, MOSFET S2-MOSFET SnI.e. the aforementioned first switching device, diode D24Namely the second diode, the resistor R3Resistance R2n+1Namely, the second current limiting resistor, the driving module 1-the driving module n is the first driving module, and the control module 1 is the first control module.
The pulse discharge circuit includes: energy storage capacitor C0Resistance R22Diode D2RBDT. In the figure DC2、R21And T2Charging circuit, T, forming a RBDT pulse discharge circuit to be measured2From T2The driving module drives and receives the control signal output by the control module 2. The peripheral circuit includes: resistance RlimitAnd a diode D1。
Wherein, the resistance R22I.e. the load resistor, diode D2Namely the third diode, the resistor RlimitI.e. a first current limiting resistor, diode D1Namely the first diode.
Note that the DC voltage source DC of the charger part1Resistance R0Switching device T1And T1The drive module can be attributed to a Marx generator and a direct current voltage source DC of a charger part2Resistance R21Switching device T2、T2The drive module and the control module 2 may be attributed to a pulse discharge circuit.
Specifically, the control module 1 is configured to independently send driving signals to the n driving modules to drive the n switching devices S1-SnOpening at corresponding time; in particular, the switching device S must first be triggered onn(ii) a At each time, the first energy storage capacitors corresponding to the switched-on switches are connected in series and output trigger voltage to the RBDT to be detected; second current limiting resistor (resistor R) in Marx generator1、R3、R2n+1) And a second diode (diode D)22、D24…) for switching the n switching devices S1-SnAre all disconnected and the charger is simultaneously directed toWhen the n first energy storage capacitors are charged, the charging current is limited; in addition, after the charging and when the switching device is turned on, the energy storage capacitor is prevented from discharging.
Then, as shown in fig. 2, the connection relationship of the various components of the Marx generator is as follows: DC (direct current)1Connection R0One end of (A) R0Another end of (1) and T1Connected, followed by a cascade of modules shown in a plurality of dashed boxes, where C is2Is one end of and R4And S2Connection, C2Another end of (1) and R3Is connected to R3Another end of (1) and S2Is connected to the other end of the same, a total of n-1 such modules, C, for an n-stage Marx generatornOne end and R2n+1Connection, CnThe other end and SnIs connected to R2n+1Another end of (1) and SnThe other end of the connecting rod is connected.
In peripheral circuit RlimitWith S in Marx generatornIs connected to one end of D and the other end is connected to D1Anode connection of D1The cathode is connected to the anode of the RBDT.
The connection relationship of each element of the pulse discharge circuit is as follows: DC (direct current)2And R21Is connected to one end of R21And one end of (A) and T2One end is connected, T2Another end of (1) and C0、R22Is connected to R22Another end of (D) and2anodic bonding, D2Is connected with the anode of the RBDT, and the cathode of the RBDT is connected with C0And DC2Is connected at the other end, DC2And C in Marx generator1Are connected at one end.
The charger is used for controlling the charging process of the Marx generator and the pulse discharging circuit and charging; the Marx generator is connected with the RBDT to be tested in series to form a loop and is used for outputting trigger voltage pulses with different dynamic characteristics to the RBDT to be tested after charging; in order to analyze the dynamic characteristics of the RBDT under load, the testing device is also provided with a pulse discharging circuit of the RBDT to be tested, the pulse discharging circuit is used for discharging after the RBDT to be tested is switched on under the trigger of the trigger voltage pulse, and discharging current flows through the RBDT to be tested so as to carry out the dynamic characteristics of the RBDT to be testedAnalyzing the dynamic characteristics, wherein the dynamic characteristics comprise rising rate, amplitude and pulse width of the trigger voltage pulse; d1And the RBDT pulse circuit is arranged on a loop of the Marx generator and the RBDT to be detected and used for preventing the influence of the RBDT pulse circuit to be detected on the Marx generator.
When testing the dynamic characteristics of the RBDT to be tested, when the Marx generator needs to output voltage pulses with different rising rates but the same peak voltage, the charging voltage of the charger on each energy storage capacitor in the Marx generator can be kept unchanged, and the switching device S in the Marx generator is controlled1-SnThe conduction time of the energy storage capacitors is controlled to discharge to the RBDT at different time to realize; if voltage pulses with the same voltage rising rate but different peak voltages need to be output, the charger needs to change the charging voltage of each energy storage capacitor in the Marx generator, and a switching device S in the Marx generator is adjusted1-SnThe rising rates of the output voltage pulses are ensured to be the same at the turn-on time, so that the output voltage of each energy storage capacitor and the charging voltage of the charger on each energy storage capacitor in the Marx generator can be controlled to output various trigger voltage pulses. When switching device S in Marx generator1-SnWhen the voltage output by the Marx generator is conducted at the same time, the voltage output by the Marx generator has the maximum voltage rising rate, and the voltage peak value is also maximum.
The Marx generator is used for providing trigger voltage of RBDT when the switching device S1Sn is in the OFF state and the charger is simultaneously a capacitor C1-CnCharging, after charging is finished, when S1-SnWhen the output voltage Vmarx of the Marx generator is still in the off state, the output voltage Vmarx of the Marx generator is 0V, and when the trigger voltage needs to be applied to the RBDT, the control module 1 outputs a control signal to the S1-SnA drive module corresponding to each switching device, when S1-SnAfter the state transition is completed, the capacitor C is blocked by a plurality of circuit protection elements because the capacitor voltage has no discontinuity1-CnWhen the output voltage of the Marx generator:
in the formula, YiOnly two values 0 and 1, when switching device Si(i is any one of 1 to n) is in OFF state, YiIs 0, Y is in the on state of the switching device SiiIs 1, VDC1For charger supply DC1The output voltage of (1). Wherein, when the Marx generator outputs voltage, the switching device SnMust be in a conducting state, as can be seen from the above, control S1-SnThe state of each switch can realize different Marx output voltage peak values.
For example, for a 5-stage Marx generator, S1-S5The trigger signals of all the switching devices are sequentially delayed by 10ns or sequentially delayed by 20ns, and when the trigger signals are sequentially delayed by 10ns, the rising rate of the voltage pulse output by the Marx generator is greater than that of the voltage pulse output by the Marx generator when the trigger signals are delayed by 20 ns.
When S is1-SnWhen the trigger signals are the same, the voltage output by the Marx generator has the maximum voltage rising rate, the voltage peak value is also the maximum, and if voltage pulses with larger rising rates are required to be obtained, S is carried out1-SnIt is desirable to use switching devices that have shorter trigger on times.
It should be noted that the switching device S in the Marx generator1-SnGenerally, the MOSFET with higher turn-on speed is selected and used, and under the condition of meeting the test requirement, other semiconductor switch devices such as IGBT and the like can be used, S1-SnThe driving module circuits are independent from each other, and the control signals received by the driving module circuits are also independent from each other, and the control signals are given by the control module 1. In addition, since many MOSFETs can be used as driving circuits, the driving modules 1 to n do not have a fixed circuit topology, and any driving circuit that can normally trigger on a MOSFET can be used in these driving modules.
Wherein the switching device T1Switching device T2IGBT, thyristor and MOSFET can be usedA means of controlling. Due to the switching device T1And a switching device T2More drive circuits can be used, therefore T1Drive module and T2The driving modules do not have a fixed circuit topology form, and as long as the driving circuit capable of normally triggering the on-off switch can be used in the driving modules.
In order to reduce the influence of the Marx generator on the RBDT test result, the pulse width of the voltage pulse output by the Marx generator needs to be larger than that of the current pulse output by a pulse discharge circuit in the device, so that S in the Marx generator can be avoided1-SnWhen the switching device is turned off, the circuit structure is suddenly changed to bring electromagnetic interference to the RBDT characteristic test.
In addition, a current limiting resistor RlmitIs determined based on the peak voltage and the pulse width of the trigger voltage pulse output by the Marx generator.
In the Marx generator, interference isolation elements are arranged between a control module 1 and n first drive modules, and in the charger, a control module 2 is respectively connected with T1Drive module and T2An interference isolation element is arranged between the driving modules.
It should be noted that the control module 1 and the control module 2 may be implemented by the same control circuit, and these control circuits also have no fixed circuit form, and generally are formed by chips such as a DSP, a single chip microcomputer, or an FPGA.
The testing device has a plurality of working modes, wherein one working mode is as follows: 1) the control module 2 simultaneously outputs control signals to T1Drive module and T2A drive module, the two drive modules simultaneously triggering the turn-on T1And T2After, DC1Capacitor C1-CnCharging until the voltage is stable, DC2Capacitor C0Charging until the voltage is stable; 2) the control module 1 outputs different control signals to the driving module 1-driving module n, the driving module triggers and turns on each switching device at corresponding time, and the Marx generator outputs voltage pulses at the moment; 2) the RBDT bears the voltage pulse output by the Marx generator, and if the voltage pulse meets the condition of triggering the voltage by the RBDT, the RBDT is triggered to be turned on in a short time; 3)capacitor C0After RBDT is turned on, R is paired22Discharging to generate current pulses; 4) and testing the current and the voltage of the RBDT by using a current probe and a voltage probe.
As shown in fig. 3, the switching device trigger signals of each stage of the 5-stage Marx generator in the test apparatus (where n is 5) are sequentially delayed by 10 ns. Suppose S1Is sent out at time 0, then time S is 10ns2Is sent out, 20ns time S3Is sent out at the 30ns time S4Is sent out, 40ns time S5Is sent out. Except for different delay times, the trigger waveforms of all stages of switching devices are the same, the pulse width of the trigger waveforms is wider and is 10 mus, and the pulse width of the RBDT trigger voltage pulse output by the Marx generator is also 10 mus.
Example two
An RBDT dynamic characteristic testing method comprises the following steps:
setting the RBDT to be tested in any one of the RBDT dynamic characteristic testing apparatuses described in the first embodiment;
controlling a Marx generator in the RBDT dynamic characteristic testing device to generate trigger pulse voltages with different dynamic characteristics to be applied to the RBDT to be tested;
and detecting whether a pulse discharge circuit in the RBDT dynamic characteristic testing device is conducted under each dynamic characteristic, and obtaining the dynamic characteristic of the RBDT to be tested based on the voltage at two ends of the RBDT and the current pulse output by the discharge of the pulse discharge circuit.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An RBDT dynamics testing apparatus, comprising: the Marx generator comprises a pulse discharge circuit of the RBDT to be detected, a charger, a first current limiting resistor and a first diode;
the charger is used for controlling the charging process of the Marx generator and the pulse discharging circuit and charging; the Marx generator is connected with the RBDT to be tested in series to form a loop and is used for outputting trigger voltage pulses with different dynamic characteristics to the RBDT to be tested after the charging; the pulse discharge circuit is used for discharging after the RBDT to be detected is triggered to be turned on by the trigger voltage pulse, the discharge current flows through the RBDT to be detected so as to analyze the dynamic characteristics of the RBDT to be detected, the first current limiting resistor and the first diode are arranged on a loop formed by the Marx generator and the RBDT to be detected, the first diode is used for preventing the pulse discharge circuit from discharging to the Marx generator before the RBDT to be detected is turned on, and the first current limiting resistor is used for preventing a switching device in the Marx generator from being damaged due to the fact that overlarge current flows through the switching device when the RBDT is turned on
The dynamic characteristics include a rise rate, an amplitude, and a pulse width of the trigger voltage pulse.
2. An RBDT dynamic behavior testing arrangement according to claim 1, wherein the Marx generator comprises: the first control module comprises n first driving modules, n first switching devices, n first energy storage capacitors, a plurality of second current limiting resistors and a plurality of second diodes, wherein the n first driving modules, the n first switching devices and the n first energy storage capacitors are in one-to-one correspondence;
the first control module is used for respectively and independently sending control signals to the n first driving modules so as to drive the n first switching devices to be switched on at corresponding switching-on moments; at each time, the first energy storage capacitors corresponding to the switched-on first switching devices are connected in series and output trigger voltage to the RBDT to be detected;
the plurality of second current limiting resistors are used for limiting the charging current of each first energy storage capacitor when the n first switching devices are all disconnected and the charger simultaneously charges the n first energy storage capacitors; in addition, after the charging and when the first switch device is switched on, the first energy storage capacitors are limited to discharge, and the first switched-on switch device is prevented from being damaged due to overlarge discharge current of the first energy storage capacitors; the plurality of second diodes are used for preventing a discharging loop circuit from being formed among the plurality of first energy storage capacitors corresponding to the plurality of first switching devices when the plurality of first switching devices are switched on, so that the control precision of the first control module is not influenced.
3. An RBDT dynamics testing apparatus according to claim 1, characterized in that the pulse width of the trigger voltage pulse output by said Marx generator is larger than the pulse width of the current pulse output by the pulse discharge circuit.
4. An RBDT dynamic behavior testing arrangement according to claim 1, wherein the resistance of the first current limiting resistor is determined based on the peak voltage and the pulse width of the trigger voltage pulse output by the Marx generator.
5. An RBDT dynamics testing arrangement according to claim 2, wherein the pulse discharge circuit includes: the second energy storage capacitor, the load resistor, the third diode and the RBDT to be detected are connected in series and form a loop; and when the second energy storage capacitor discharges, the pulse discharge circuit forms a current pulse on the load resistor.
6. An RBDT dynamics testing apparatus according to claim 5, wherein said charger includes: the second control module, the second driving module, the first charging circuit connected with each first energy storage capacitor in series, the third driving module and the second charging circuit connected with the second energy storage capacitor in series;
the second control module is used for sending a driving signal to the second driving module to conduct the first charging circuit to charge the first energy storage capacitors and sending a driving signal to the third driving module to conduct the second charging circuit to charge the second energy storage capacitors before dynamic testing.
7. An RBDT dynamics testing apparatus according to claim 6, wherein said first charging circuit comprises: the second switching device, the first power supply and the third current-limiting resistor are connected in series and form a loop with each first energy-storing capacitor, wherein the second switching device is driven to be switched on by the second driving module;
the second charging circuit includes: and the third switching device, the second power supply and the fourth current-limiting resistor are connected in series and form a loop with the second energy-storing capacitor, wherein the third switching device is driven by the third driving module to be switched on.
8. An RBDT dynamics testing apparatus according to claim 6, wherein the charging voltage is determined in accordance with the actual required magnitude of the trigger voltage.
9. An RBDT dynamics testing apparatus according to claim 6, characterised in that interference isolation elements are provided between the first control module and each of the first drive modules and/or between the second control module and the second and third drive modules respectively.
10. An RBDT dynamic characteristic testing method is characterized by comprising the following steps:
setting an RBDT to be tested in an RBDT dynamic testing apparatus according to any one of claims 1 to 9;
controlling a Marx generator in the RBDT dynamic characteristic testing device to generate trigger voltage pulses with different dynamic characteristics to be applied to the RBDT to be tested;
and detecting whether the pulse discharge circuit in the RBDT dynamic characteristic testing device is conducted under each dynamic characteristic, and obtaining the dynamic characteristic of the RBDT to be tested based on the voltage at two ends of the RBDT to be tested corresponding to each conduction and the current pulse output by the pulse discharge circuit in a discharge mode.
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