Pulse current generating device and control method thereof

Abstract

The application relates to a pulse current generating device and a control method thereof. The device comprises a charging module, a trigger control module and a pulse shaping module. The charging module and the trigger control module are electrically connected with the pulse shaping module. The pulse shaping module comprises a plurality of discharge units. The charging module is used for receiving a charging command and charging the plurality of discharge units. The trigger control module is used for receiving a trigger command and sequentially triggering the plurality of charged discharge units in time sequence, so that the plurality of discharge units sequentially output corresponding pulse currents. The technical scheme of the application can realize a pulse large current with a wider pulse width and a higher peak, so as to stably test a load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulse power supply, in particular to a pulse current generating device and a control method thereof. BACKGROUND

[0002] A large-current pulse source can be used to test the performance and stability of power equipment, such as the impulse current test of devices such as circuit breakers and lightning arresters. In physical, chemical and other scientific experiments, a large-current pulse source can also be used to generate extreme conditions such as high temperature, high pressure and strong magnetic field to provide the required energy for the experiment.

[0003] Some scientific research projects need large-current long-pulse-width pulse current as energy for testing. If the traditional pulse large-current pulse width needs to be adjusted, one way is to change the load characteristics, and the other way is to change the charging voltage value / energy storage value, but these two methods are not easy to implement in actual operation, and pose a challenge to the selection of components. SUMMARY

[0004] Based on the above description, the present application provides a pulse current generating device and a control method thereof to solve the problem that the current pulse is difficult to adjust.

[0005] According to a first aspect, the present application provides a pulse current generating device, comprising: a charging module, a trigger control module and a pulse shaping module; the charging module and the trigger control module are electrically connected with the pulse shaping module respectively; the pulse shaping module comprises a plurality of discharge units;

[0006] The charging module is configured to receive a charging command and charge the plurality of discharge units.

[0007] The trigger control module is configured to receive a trigger command and sequentially trigger the charged plurality of discharge units in time sequence, so that the plurality of discharge units sequentially output corresponding pulse currents.

[0008] In one or more embodiments, the trigger control module comprises a control board and a driving unit; the control board is configured to receive the trigger command and control the driving unit to drive the plurality of discharge units; and the driving unit is configured to sequentially trigger the plurality of discharge units to discharge.

[0009] The driving unit comprises a plurality of pulse transformers, each pulse transformer being electrically connected to one discharge unit.

[0010] In one or more embodiments, each of the discharge units comprises a storage capacitor and a discharge switch; a first end of the discharge switch is electrically connected to the trigger control module; a second end of the discharge switch is electrically connected to one end of the storage capacitor, and the other end of the storage capacitor is electrically connected to the charging module; and a third end of the discharge switch is configured to be electrically connected to a load.

[0011] In one or more embodiments, the discharge switch is configured as a thyristor; and / or

[0012] A parallel-connected freewheeling diode is connected across the storage capacitor.

[0013] In one or more embodiments, a parallel-connected equivalent resistor is connected across each of the discharge switches; and / or

[0014] A parallel-connected RCD buffer circuit is connected across the discharge switch; and / or

[0015] A parallel-connected voltage-dependent resistor is connected across the discharge switch.

[0016] In one or more embodiments, each of the discharge units further comprises a discharge inductor and a discharge resistor; the discharge switch, the discharge inductor and the discharge resistor are electrically connected in sequence, and one end of the discharge resistor, which is away from the discharge inductor, is configured to be electrically connected to a load.

[0017] The discharge inductor is configured to adjust the peak of the discharge current of the storage capacitor.

[0018] The discharge resistor is configured to adjust the front edge steepness of the discharge current of the storage capacitor.

[0019] In one or more embodiments, a control module is further included, which is configured to control the charging and discharging of the charging module, and to control the trigger control module to send a trigger signal to the pulse shaping module; the trigger signal is configured to sequentially trigger the discharging of the plurality of discharge units.

[0020] In one or more embodiments, an output end of each of the discharge units is electrically connected to a current sensor, and the current sensor is electrically connected to the control module.

[0021] In one or more embodiments, an energy dissipation module is further included, which is electrically connected between the control module and the pulse shaping module, and is configured to dissipate the energy of each of the discharge units that has been charged but not completely discharged.

[0022] According to a second aspect, the present application provides a control method of a pulse current generating device, the pulse current generating device comprising a charging module, a trigger control module and a pulse shaping module; the control method comprising:

[0023] Receive charging commands and trigger commands;

[0024] The charging module charges the plurality of discharge units in the pulse shaping module according to the charging command;

[0025] The trigger control module triggers the plurality of charged discharge units in sequence according to the trigger command, so that the plurality of discharge units output corresponding pulse currents in sequence.

[0026] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0027] The pulse current generating device of the present application includes a charging module, a trigger control module and a pulse shaping module; the pulse shaping module includes multiple discharge units; the charging module charges each discharge unit according to the charging command, and after charging stops, the trigger control module triggers each charged discharge unit in sequence according to the trigger command, so that each discharge unit outputs the corresponding pulse current in sequence. In this way, the waveforms of each pulse current are superimposed to obtain a large pulse current with a wider pulse width and a higher peak, so as to stably test the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the principle of a pulse current generating device provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 The charge and discharge control principle diagram of a discharge unit;

[0030] Figure 3 This is a circuit diagram of a driving unit and a discharging unit in a specific embodiment of the present application;

[0031] Figure 4 This is a circuit diagram between each discharge unit and the load in a specific embodiment of the present application;

[0032] Figure 5 Schematic diagram of a flow chart of a control method of a pulse current generating device in one embodiment of the present application;

[0033] Figure 6 A schematic diagram of the triggering timing of each discharge unit in a specific embodiment of the present application;

[0034] Figure 7 Schematic diagram of the waveform of traditional pulse current;

[0035] Figure 8 Schematic diagram of the waveform of the pulsed high current output by the control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] For the purpose of promoting the understanding of the present application, a more complete description of the application will be provided below with reference to the relevant drawings. The drawings show embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0038] It can be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through a central element. In the following embodiments, "connected" between the circuits, units, units, etc. connected to each other, if there is transmission of electrical signals or data between them, it should be understood as "electrically connected", "communication connection" and the like.

[0039] Some scientific research projects need large current long pulse current as energy for testing. The pulse current of the traditional single channel mainly depends on the charging voltage and the load characteristics, and the pulse width cannot be actively adjusted. If the pulse width of the traditional pulse current needs to be adjusted, one is to change the load characteristics, and the other is to change the charging voltage value / energy storage value, but these two methods are not easy to implement in actual operation, and challenge the selection of components.

[0040] Based on this, the embodiments of the present application provide a pulse current generating device and a control method thereof to solve the problem that the pulse current is difficult to adjust at present.

[0041] Referring to Figure 1 , Figure 1 A principle schematic diagram of a pulse current generating device provided by an embodiment of the present application is shown. The pulse current generating device 100 provided by an embodiment of the present application includes a charging module 10, a trigger control module 20 and a pulse shaping module 30; the charging module 10 and the trigger control module 20 are electrically connected with the pulse shaping module 30 respectively; the pulse shaping module 30 includes a plurality of discharge units 31; the charging module 10 is used for receiving a charging command and charging the plurality of discharge units 31; the trigger control module 20 is used for receiving a trigger command and triggering the plurality of charged discharge units 31 in sequence according to a time sequence, so that the plurality of discharge units 31 output corresponding pulse currents in sequence.

[0042] It should be noted that the pulse shaping module 30 includes a plurality of discharge units 31, and the number of the discharge units 31 can be set according to actual conditions, which is not limited in the embodiment. Specifically, the user can send a charging command to the charging module 10 and send a trigger command to the trigger control module 20 through the upper computer 200. The charging command can include charging parameters such as charging voltage and charging time. The trigger command can include trigger timing and trigger delay. The charging module 10 adopts a high-voltage charger. It should be noted that after the charging module 10 fully charges or reaches the energy storage threshold of each discharge unit 31, the trigger control module 20 triggers each charged discharge unit 31 in sequence according to the trigger command, so that each discharge unit 31 outputs a corresponding pulse current in sequence, and the current source is provided to the load 300 through the high-voltage output interface K.

[0043] The embodiment of the application charges each discharge unit 31 according to the charging command through the charging module 10, and after the charging stops, triggers each charged discharge unit 31 in sequence according to the trigger command through the trigger control module 20, so that each discharge unit 31 outputs a corresponding pulse current in sequence. In this way, the waveforms of each pulse current are superimposed to obtain a pulse large current with a wider pulse width and a higher peak. It should be noted that when a larger pulse current is needed, the trigger delay between different branches, i.e., the discharge units 31, can be reduced, so that the waveforms of the multiple currents are superimposed faster, thereby generating a larger pulse current. When a longer current pulse width is needed, the trigger delay between different branches can be appropriately increased to stagger the peak currents of each branch and uniformly superimpose them, thereby obtaining a longer current pulse width.

[0044] Referring to Figure 1 and Figure 2 In some embodiments, the trigger control module 20 includes a control board 21 and a driving unit 22; the control board 21 is configured to receive the trigger command and control the driving unit 22 to drive the plurality of discharge units 31; and the driving unit 22 is configured to trigger the plurality of discharge units 31 to discharge in sequence. The driving unit 22 includes a plurality of pulse transformers 221, and each pulse transformer 221 is electrically connected to one discharge unit 31.

[0045] It should be noted that the control board 21 can use high-speed optical communication chips HFBR1414TZ and HFBR2412TZ. The signals sent by the control board 21 are weak signals, and the circuits in the discharge unit 31 are high-voltage circuits. In order to provide a good electromagnetic environment for trigger control, each drive unit 22 in the embodiment uses a pulse transformer 221 to isolate high voltage and improve anti-interference ability. In addition, the pulse transformer 221 is a passive device, and the circuit board design should be electromagnetically compatible according to its position to eliminate electromagnetic interference. Further, the trigger control module 20 involves shielding the circuit with a metal shell to reduce electromagnetic interference. Further, the discharge unit 31 and the drive unit 22 are connected by high-voltage lines to isolate high and low potentials. In this way, the pulse transformer 221 generates the pulse drive current signal required by the discharge unit 31 when the pulse discharge is triggered, and at the same time, the control board 21 and the discharge unit 31 are isolated by the pulse transformer 221, and the circuit layout is reasonable, which effectively improves the anti-interference ability and reliability of the circuit.

[0046] Continuing to refer to Figure 2 In some embodiments, each discharge unit 31 is independent of each other, and each discharge unit 31 includes an energy storage capacitor 311 and a discharge switch 312; the first end of the discharge switch 312 is electrically connected to the trigger control module 20; the second end of the discharge switch 312 is electrically connected to one end of the energy storage capacitor 311, and the other end of the energy storage capacitor 311 is electrically connected to the charging module 10; the third end of the discharge switch 312 is used for electrically connected to the load 300.

[0047] Specifically, each discharge unit 31 is independent of each other, which facilitates timing control. Each discharge switch 312 has a first end, a second end and a third end, the first end of the discharge switch 312 is electrically connected to one pulse transformer 221 of the drive unit 22, the second end is electrically connected to one end of the energy storage capacitor 311, and the third end is indirectly electrically connected to the load 300, and the other end of the energy storage capacitor 311 is electrically connected to the charging module 10. In this way, the energy storage capacitor 311 is charged by the charging module 10, and the pulse drive current signal is sent to the discharge switch 312 by the pulse transformer 221 to realize the conduction of the discharge switch 312, so that the energy storage capacitor 311 can discharge to generate a pulse current.

[0048] Referring to Figure 2 , Figure 3 and Figure 4In some embodiments, the discharge switch 312 is configured as a thyristor Tl. The pulse transformer 221 is configured as a transformer Bl. The energy storage capacitor 311 is configured as a capacitor Cl. In this way, the turn-on or turn-off of the discharge unit 31 is realized by the thyristor Tl, which can realize the effects of no electric shock, fast action, long service life and almost no maintenance. In addition, in the present embodiment, the transformer Bl can be arranged close to the corresponding thyristor Tl to better cooperate with the thyristor Tl power regulator and improve the energy utilization efficiency and stability of the entire system.

[0049] In the present embodiment, in order to quickly and reliably turn on the thyristor Tl, a trigger current with a large enough amplitude and a steep pulse front edge must be provided to the gate of the thyristor Tl. In the present embodiment, more energy storage can be achieved by increasing the capacitance value of the capacitor Cl to increase the amplitude of the trigger current of the thyristor Tl. Alternatively, a transformer Bl with a high coupling coefficient and low distribution parameters can be selected to reduce attenuation, which can also increase the amplitude of the trigger current of the thyristor Tl. Alternatively, the trigger control signal sent by the control panel 21 passes through the field effect transistor Ml to realize high-speed switching, and then passes through the transformer Bl and the capacitor Cl to provide the thyristor Tl with a trigger current with a steep pulse front edge.

[0050] Continuing to refer to Figure 4 In some embodiments, a freewheeling diode Dl is connected in parallel across the energy storage capacitor 311. Specifically, the freewheeling diode Dl is connected in parallel across the capacitor Cl. In this way, by connecting a freewheeling diode Dl in parallel across each capacitor Cl used for energy storage, reverse discharge damage to the energy storage capacitor 311 can be prevented.

[0051] Continuing to refer to Figure 3 In some embodiments, an equivalent resistor Rl is connected in parallel across each discharge switch 312. Specifically, the equivalent resistor Rl is connected in parallel across the thyristor Tl. It should be noted that in order to make the voltage distribution on each thyristor Tl uniform, a resistor Rl with the same resistance value is connected in parallel across the valve plate of each thyristor Tl to achieve static uniform protection for each thyristor Tl and improve the safety and stability of the device.

[0052] Further, the discharge switch 312 is connected in parallel with an RCD buffer circuit. Specifically, the RCD buffer circuit is composed of a resistor R2 and a capacitor C2, and is connected in parallel with the thyristor T1. In this embodiment, the RCD buffer circuit is connected in parallel with the thyristor T1 to obtain better voltage equalization effect, ensure the safety of the device, and reduce the overvoltage caused by inconsistent turn-off due to the delay of the gate drive signal and the different recovery times of the reverse recovery charge. The working principle of the RCD buffer circuit is to use the property that the voltage of the capacitor C2 cannot change abruptly to slow down the rapid change of the voltage on the power electronic device, achieve dynamic voltage equalization, and improve the stability of the device. In addition to the dynamic voltage equalization function, the RCD buffer circuit also has the functions of overvoltage protection and the like in some cases, which have been considered in the circuit design.

[0053] In some embodiments, a pressure-sensitive resistor R3 is connected in parallel with the discharge switch 312. Specifically, the pressure-sensitive resistor R3 is connected in parallel with the thyristor T1. It should be noted that when a transient overvoltage occurs in the circuit of the discharge unit 31, the pressure-sensitive resistor R3 and the protected devices and components simultaneously bear this overvoltage, and the response speed of the pressure-sensitive resistor R3 used is in the order of nanoseconds, which can effectively limit the voltage and thus protect the devices and components from the impact of overvoltage, thereby improving the safety of the device.

[0054] Further, continuing to refer to Figure 3 A T-shaped loop is provided between the transformer B1 and the thyristor T1, and the T-shaped loop is composed of a resistor R4 and a diode D2. Specifically, the resistor R4 is mainly used to limit the current output by the transformer B1 to protect the devices, and the diode D2 is mainly used for protection, unidirectional conduction, and prevention of reverse discharge damage to the devices.

[0055] Continuing to refer to Figure 2 In some embodiments, the discharge unit 31 further includes a discharge inductor 313 and a discharge resistor 314; the discharge switch 312, the discharge inductor 313, and the discharge resistor 314 are sequentially electrically connected, and one end of the discharge resistor 314 away from the discharge inductor 313 is used for electrical connection to the load 300; the discharge inductor 313 is used for adjusting the peak of the discharge current of the energy storage capacitor 311; and the discharge resistor 314 is used for adjusting the steepness of the waveform front of the discharge current of the energy storage capacitor 311.

[0056] It should be noted that the above description can be combined with Figure 4, the discharge inductance 313 is configured as the inductance L1, the discharge resistance 314 is configured as the resistance R5, and the resistance R0 and the inductance L0 represent the equivalent characteristics of the load 300. Specifically, the capacitor C1, the thyristor T1, the inductance L1 and the resistance R5 are connected in series, and form a loop with the resistance R0 and the inductance L0. After the thyristor T1 is turned on, the capacitor C1 starts to discharge and passes through the inductance L1 and the resistance R5, the peak of the discharge current of the capacitor C1 is adjusted by the inductance L, and the steepness of the front edge of the waveform of the discharge current of the capacitor C1 is adjusted by the resistance R5, so as to output the corresponding pulse current. It should be noted that the greater the resistance value of the resistance R5, the smaller the peak of the discharge current; the smaller the inductance value of the inductance L1, the steeper the steepness of the front edge of the waveform of the discharge current. In this way, the waveform of the discharge current is controlled by the inductance L1 and the resistance R5, which helps to adjust the pulse width and the peak of the pulse current.

[0057] Continuing to refer to Figure 1 and Figure 2 In some embodiments, a control module 40 is further included, which is configured to control the charging and discharging of the charging module 10, and control the trigger control module 20 to send a trigger signal to the pulse shaping module 30; the trigger signal is used to trigger the plurality of discharge units 31 to discharge in sequence. Specifically, the user sends a charging command and a trigger command to the control module 40 through the upper computer 200, the control module 40 sends the charging command to the charging module 10, the charging module 10 charges the energy storage capacitor 311 in each discharge unit 31, and after the charging is completed, the control module 40 sends the trigger command to the trigger control module 20, each pulse transformer 221 in the trigger control module 20 outputs a pulse driving current signal, i.e. a trigger signal, to trigger the discharge switch 312 in each discharge unit 31 to conduct in sequence, so that the charged energy storage capacitor 311 discharges. In this way, by setting the control module 40, the charging and discharging operation of the pulse shaping module 30 by the charging module 10 and the trigger control module 20 is facilitated, the mis-triggering of the pulse shaping module 30 is avoided, and the anti-interference capability is improved.

[0058] Continuing Figure 2 In some embodiments, the output end of each discharge unit 31 is electrically connected to a current sensor 315, and the current sensor 315 is electrically connected to the control module 40. In this embodiment, the energy storage capacitor 311, the discharge switch 312, the discharge inductance 313 and the discharge resistance 314 are connected in series, and form a loop with the load 300. By connecting the current sensor 315 between the discharge resistance 314 and the load 300, the peak and the pulse width of the pulse current output by the discharge unit 31 are detected.

[0059] Continuing Figure 2 and Figure 3In some embodiments, a discharge module 50 is further included, which is electrically connected between the control module 40 and the pulse forming module 30, and is configured to discharge the energy storage capacitor 311 in each discharge unit 31 that is fully charged but not fully discharged. Specifically, the discharge module 50 refers to a device configured to consume the electric energy of the energy storage capacitor 311 in the discharge unit 31. The discharge module 50 can be an IGBT module, a diode, a resistor or the like. The discharge module 50 is electrically connected between the control module 40 and the pulse forming module 30. It is to be noted that the trigger operation state can be monitored by the control module 40. When the control module 40 determines that each discharge unit 31 is fully charged but no trigger signal is received by each discharge unit 31, the control module 40 controls the discharge module 50 to discharge the energy storage capacitor 311 in the discharge unit 31. Alternatively, when the control module 40 determines that each discharge unit 31 is fully charged and has completed discharging, the control module 40 controls the discharge module 50 to discharge the residual electric charge in each energy storage capacitor 311. In this way, the circuit and device of the discharge unit 31 can be protected, and the service life is improved by arranging the discharge module 50.

[0060] Referring to Figure 1 , Figure 2 and Figure 5 , based on the same inventive concept, the embodiments of the present application further provide a control method of the pulse current generating device, which comprises a charging module 10, a trigger control module 20 and a pulse forming module 30. The control method of the present embodiment comprises:

[0061] S10, receiving a charging command and a trigger command.

[0062] S20, the charging module 10 charges the plurality of discharge units 31 in the pulse forming module 30 according to the charging command.

[0063] S30, the trigger control module 20 triggers the plurality of discharge units 31 that are charged in sequence according to the trigger command, so that the plurality of discharge units 31 outputs corresponding pulse currents in sequence.

[0064] In the present embodiment, the charging command can include charging parameters such as charging voltage and charging time. The trigger command can include trigger timing and trigger delay. Specifically, the user sends the charging command and the trigger command to the pulse current generating device through the upper computer 200. The charging module 10 charges the energy storage capacitor 311 in each discharge unit 31 according to the charging command. After the charging is completed, each pulse transformer 221 in the trigger control module 20 outputs a pulse driving current signal, i.e. a trigger signal, to trigger each discharge switch 312 in the discharge unit 31 in sequence, so that the charged energy storage capacitor 311 is discharged, and each discharge unit 31 outputs corresponding pulse currents in sequence. Referring toFigure 6 In a specific embodiment, the pulse shaping module 30 employs 6 discharge units 31, and the trigger control module 20 triggers the 6 discharge units 31 in sequence according to the trigger timings P1, P2, P3, P4, P5, P6. In this way, the pulse current waveforms output by the individual discharge units 31 are superimposed, resulting in a pulse current with a wider pulse width and a higher peak, and the current peak value and output pulse width of the output current waveform can be adjusted by the different branch trigger timings.

[0065] It should be noted that the control board 21 in the trigger control module 20 employs high-speed optical communication chips HFBR1414TZ and HFBR2412TZ, which have a maximum transmission delay of 65 ns. Adding the delay of the logic circuit in the circuit, the total delay time will not exceed 1 us. For the required 1.5 ms pulse width, the error is less than 0.67‰, so the adjustment accuracy is high.

[0066] In the present embodiment, the peak value, rising edge, and falling edge data of the single-channel output can be obtained by performing a discharge test on the circuit of a single discharge unit 31. According to the relationship between the falling edge and peak value of the preceding discharge unit 31 and the relationship between the rising edge and peak value of the subsequent discharge unit 31, the delay between the discharge units 31 can be calculated according to the required pulse width and peak value. Specifically, the expected peak value is set to Xmax, the total pulse width is set to Tmax, the single-channel discharge peak value is set to X (X>Xmax), the rising edge is set to Tup, and the falling edge is set to Tdown. The trigger delay between the first discharge unit 31 and the second discharge unit 31 is set to T12, and the pulse current waveform of the first discharge unit 31 is fitted with the pulse current waveform of the second discharge unit 31, so that the falling edge of the first discharge unit 31 partially overlaps with the rising edge of the second discharge unit 31. When X=1.05Xmax, the second discharge unit 31 is triggered (the trigger delay at this time is T12), at which time the pulse current of the second discharge unit 31 is superimposed with the pulse current of the first discharge unit 31, ensuring that the real-time current exceeds 1.05Xmax. In this way, when the superimposed current reaches 1.05Xmax, the subsequent discharge units 31 are triggered, and current superposition compensation is performed to obtain an output current with a high peak value and a long pulse width.

[0067] It should be noted that when a larger pulse current is required, the trigger delay between the different branches, i.e., the discharge units 31, can be reduced to allow the multiple current waveforms to be superimposed more quickly, thereby generating a larger pulse current. When a longer current pulse width is required, the trigger delay between the different branches can be appropriately increased to stagger the peak current of each branch and uniformly superimpose them, thereby obtaining a longer current pulse width.

[0068] Referring to Figure 7 and Figure 8 , Figure 7A waveform diagram of a traditional pulse current is shown, Figure 8 A waveform diagram of a pulse large current output by the control method based on the embodiment of the application is shown. The traditional pulse current waveform presents a rapid rising and falling trend, and the pulse width at the peak value is short. In order to obtain a long pulse width large current, the discharge energy needs to be increased to obtain an output waveform of "current peak value > 100 kA and duration not less than 1.5 ms", and the current peak value needs to reach 200 kA or even higher, which causes challenges to the selection of various capacitors, resistors and other components. The pulse large current waveform output by the control method based on the embodiment is triggered to the second discharge unit 31 when the peak of the pulse current waveform output by the first discharge unit 31 starts to fall, the two waveforms are superimposed, the third discharge unit 31 is triggered when the superimposed waveform falls, and the like. Through the superposition of multiple waveforms, an output waveform with a long pulse width and a high peak value is obtained, and the waveform pulse width can be adjusted through the trigger timing, which is not only convenient to adjust, but also has a small difficulty in component selection and a wide range of component models that can be selected.

[0069] In summary, the embodiment of the application charges each discharge unit 31 according to the charging command through the charging module 10, and after the charging is stopped, triggers the charged discharge unit 31 in sequence according to the trigger command through the trigger control module 20, so that each discharge unit 31 outputs the corresponding pulse current in sequence. In this way, by modifying the trigger delay between different branches, i.e. the discharge units 31, the peak value and pulse width of the output current are adjusted. When a larger pulse current is needed, the trigger delay between different branches, i.e. the discharge units 31, can be reduced to make the multiple current waveforms superimposed faster, thereby generating a larger pulse current. When a longer current pulse width is needed, the trigger delay between different branches can be appropriately increased to stagger the peak current of each branch and uniformly superimpose, thereby obtaining a longer current pulse width. In addition, the pulse transformer 221 generates the pulse drive current signal required by the discharge unit 31 when the pulse discharge is triggered, at the same time, the control board 21 and the discharge unit 31 are isolated through the pulse transformer 221, and the circuit anti-interference ability and reliability are effectively improved through reasonable circuit layout.

[0070] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A pulse current generating device, characterized in that: include: Charging module, trigger control module and pulse shaping module; The charging module and the trigger control module are electrically connected to the pulse shaping module respectively; the pulse shaping module includes a plurality of discharge units; The charging module is configured to receive a charging command and charge the plurality of discharge units; The trigger control module is configured to receive a trigger command and trigger the plurality of charged discharge units in sequence, so that the plurality of discharge units sequentially output corresponding pulse currents; Each of the discharge units includes an energy storage capacitor and a discharge switch; the first end of the discharge switch is electrically connected to the trigger control module; the second end of the discharge switch is electrically connected to one end of the energy storage capacitor, and the other end of the energy storage capacitor is electrically connected to the charging module; the third end of the discharge switch is used to be electrically connected to the load; the discharge unit also includes a discharge inductor and a discharge resistor; the discharge switch, the discharge inductor and the discharge resistor are electrically connected in sequence, and the end of the discharge resistor facing away from the discharge inductor is used to be electrically connected to the load; the discharge inductor is used to adjust the peak of the discharge current of the energy storage capacitor; the discharge resistor is used to adjust the waveform front steepness of the discharge current of the energy storage capacitor.

2. The pulse current generating device according to claim 1, characterized in that: The trigger control module includes a control board and a driving unit; the control board is used to receive the trigger command and control the driving unit to drive the multiple discharge units; the driving unit is used to trigger the multiple discharge units to discharge in sequence; The driving unit includes a plurality of pulse transformers, and each of the pulse transformers is electrically connected to one of the discharge units.

3. The pulse current generating device according to claim 1, characterized in that: The discharge switch is configured as a thyristor; and / or A freewheeling diode is connected in parallel at both ends of the energy storage capacitor.

4. The pulse current generating device according to claim 1, characterized in that: A resistor of equal value is connected in parallel across both ends of each of the discharge switches; and / or An RCD snubber circuit is connected in parallel at both ends of the discharge switch; and / or Two ends of the discharge switch are connected in parallel with a varistor.

5. The pulse current generating device according to any one of claims 1 to 4, characterized in that: It also includes a centralized control module, which is used to control the charging and power-off of the charging module, and control the trigger control module to send a trigger signal to the pulse shaping module; the trigger signal is used to trigger the multiple discharge units to discharge in sequence.

6. The pulse current generating device according to claim 5, characterized in that: The output end of each discharge unit is electrically connected to a current sensor, and the current sensor is electrically connected to the centralized control module.

7. The pulse current generating device according to claim 5, characterized in that: It also includes an energy dissipation module, which is electrically connected between the centralized control module and the pulse shaping module. The energy dissipation module is used to dissipate energy from each of the discharge units that have been charged but not fully discharged.

8. A control method for a pulse current generating device, characterized in that: The pulse current generating device includes a charging module, a trigger control module and a pulse shaping module; the control method includes: Receive charging commands and trigger commands; The charging module charges the plurality of discharge units in the pulse shaping module according to the charging command; The trigger control module triggers the multiple charged discharge units in sequence according to the trigger command, so that the multiple discharge units output corresponding pulse currents in sequence; Each of the discharge units includes an energy storage capacitor and a discharge switch; the first end of the discharge switch is electrically connected to the trigger control module; the second end of the discharge switch is electrically connected to one end of the energy storage capacitor, and the other end of the energy storage capacitor is electrically connected to the charging module; the third end of the discharge switch is used to be electrically connected to the load; the discharge unit also includes a discharge inductor and a discharge resistor; the discharge switch, the discharge inductor and the discharge resistor are electrically connected in sequence, and the end of the discharge resistor facing away from the discharge inductor is used to be electrically connected to the load; the discharge inductor is used to adjust the peak of the discharge current of the energy storage capacitor; the discharge resistor is used to adjust the waveform front steepness of the discharge current of the energy storage capacitor.

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