Pulse current generating device and control method thereof

Abstract

The invention relates to a pulse current generating device and a control method thereof. The pulse current generating device comprises a charging module, a trigger control module and a pulse forming module, the charging module and the trigger control module are electrically connected with the pulse forming 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 discharging units; and the trigger control module is used for receiving a trigger command and sequentially triggering the plurality of charged discharge units according to a time sequence, so that the plurality of discharge units sequentially output corresponding pulse current. According to the technical scheme of the invention, large pulse current with wider pulse width and higher wave crest can be realized, so that the load can be stably tested.

Description

Technical Field

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

[0002] High current pulse sources can be used to test the performance and stability of power equipment, such as impulse current testing of circuit breakers, lightning arresters, etc. In scientific research experiments such as physics and chemistry, high current pulse sources can also be used to generate extreme conditions such as high temperature, high pressure, and strong magnetic field to provide the energy required for the experiment.

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

[0004] Based on the above description, the present application provides a pulse current generating device and a control method thereof to solve the current problem that the pulse current 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 to the pulse shaping module respectively; the pulse shaping module comprises a plurality of discharge units;

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

[0007] The trigger control module is used to receive a trigger command and trigger the multiple charged discharge units in sequence in order to make the multiple discharge units output corresponding pulse currents in sequence.

[0008] In one or more embodiments, 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;

[0009] Wherein, the driving unit includes a plurality of pulse transformers, and each of the pulse transformers is electrically connected to one of the discharge units.

[0010] In one or more embodiments, 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 a load.

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

[0012] A freewheeling diode is connected in parallel at both ends of the energy storage capacitor.

[0013] In one or more embodiments, two ends of each of the discharge switches are connected in parallel with resistors of equal value; and / or

[0014] An RCD snubber circuit is connected in parallel at both ends of the discharge switch; and / or

[0015] Two ends of the discharge switch are connected in parallel with a varistor.

[0016] In one or more embodiments, the discharge unit further includes a discharge inductor and a discharge resistor; the discharge switch, the discharge inductor and the discharge resistor are electrically connected in sequence, and an end of the discharge resistor away from the discharge inductor is used to be electrically connected to a load;

[0017] The discharge inductor is used to adjust the peak value of the discharge current of the energy storage capacitor;

[0018] The discharge resistor is used to adjust the waveform front steepness of the discharge current of the energy storage capacitor.

[0019] In one or more embodiments, a centralized control module is further included, wherein the centralized control module 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.

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

[0021] In one or more embodiments, an energy dissipation module is further included. The energy dissipation module is electrically connected between the centralized control module and the pulse shaping module. The energy dissipation module is used to discharge energy from each of the discharge units that have been charged but not fully discharged.

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

[0023] Receive charging commands and triggering 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 multiple charged discharge units in sequence according to the trigger command, so that the multiple 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 a plurality of discharge units; each discharge unit is charged according to a charging command by the charging module, and after charging stops, each charged discharge unit is triggered in sequence according to a trigger command by the trigger control module, so that each discharge unit outputs a corresponding pulse current in sequence, so that 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 A circuit diagram of a driving unit and a discharging unit in a specific embodiment of the present application;

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

[0032] Figure 5 This is 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 It is a schematic diagram of the waveform of the traditional pulse current;

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

[0036] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. 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 those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] It is 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 an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, units, units, etc. have electrical signals or data transmission between each other.

[0039] Some scientific research projects require large current and long pulse width as energy for testing. The pulse width of the traditional single-channel pulse current mainly depends on the charging voltage and load characteristics, and the pulse width cannot be actively adjusted. If the pulse width of the traditional pulse large 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, which poses a challenge to 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 current problem that the pulse current is difficult to adjust.

[0041] See also Figure 1 , Figure 1 The schematic diagram of the principle of a pulse current generating device provided by an embodiment of the present application is shown. A pulse current generating device 100 provided by an embodiment of the present application comprises: 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 to the pulse shaping module 30 respectively; the pulse shaping module 30 comprises a plurality of discharge units 31; the charging module 10 is used to receive a charging command and charge the plurality of discharge units 31; the trigger control module 20 is used to receive a trigger command and sequentially trigger the plurality of charged discharge units 31 according to a time sequence, so that the plurality of discharge units 31 sequentially output corresponding pulse currents.

[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 this embodiment. Specifically, the user can send a charging command to the charging module 10 and a trigger command to the trigger control module 20 through the host computer 200. The charging command may include charging parameters such as charging voltage and charging duration. The trigger command may include a trigger sequence and a trigger delay. The charging module 10 uses a high-voltage charger. It should be noted that after the charging module 10 fully charges each discharge unit 31 or reaches the energy storage threshold, 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 the corresponding pulse current in sequence, and provides a current source to the load 300 through the high-voltage output interface K.

[0043] In the embodiment of the present application, the charging module 10 charges each discharge unit 31 according to the charging command. After the charging stops, 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 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. It should be noted that when a larger pulse current is required, the trigger delay between different branches, that is, the discharge units 31, can be reduced, so that the multi-channel current waveforms can be superimposed faster, thereby generating a larger pulse current. When a longer current pulse width is required, the trigger delay between different branches can be appropriately increased, the peak currents of each branch can be staggered and evenly superimposed, thereby obtaining a longer current pulse width.

[0044] See also Figure 1 and Figure 2 In some embodiments, the trigger control module 20 includes a control board 21 and a drive unit 22; the control board 21 is used to receive a trigger command and control the drive unit 22 to drive multiple discharge units 31; the drive unit 22 is used to sequentially trigger the multiple discharge units 31 to discharge. The drive unit 22 includes multiple pulse transformers 221, and each pulse transformer 221 is electrically connected to a discharge unit 31.

[0045] It should be noted that the control board 21 can use high-speed optical communication chips HFBR1414TZ and HFBR2412TZ. The signal sent by the control board 21 is a weak current signal, while the circuit in the discharge unit 31 is a high-voltage circuit. In order to provide a good electromagnetic environment for trigger control, each drive unit 22 in this embodiment uses a pulse transformer 221 to isolate the high voltage and improve the anti-interference ability. In addition, the pulse transformer 221 is a passive device, and the design of its circuit board should be designed for electromagnetic compatibility according to its position to eliminate the influence of electromagnetic interference. Further, the circuit involved in the trigger control module 20 is shielded by a metal shell to reduce electromagnetic interference. Further, the discharge unit 31 and the drive unit 22 are connected by a high-voltage line to achieve isolation of high and low potentials. In this way, the pulse drive current signal required by the discharge unit 31 when the pulse discharge is triggered is generated by the pulse transformer 221. At the same time, the control board 21 and the discharge unit 31 are isolated by the pulse transformer 221, and the circuit anti-interference ability and reliability are effectively improved through reasonable circuit layout.

[0046] Continue reading 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; a first end of the discharge switch 312 is electrically connected to the trigger control module 20; a 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; a third end of the discharge switch 312 is used to be electrically connected to the load 300.

[0047] Specifically, each discharge unit 31 is independent of each other, which is convenient for 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 a 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. 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 and stored by the charging module 10, and a pulse drive current signal is sent to the discharge switch 312 through the pulse transformer 221 to realize the conduction of the discharge switch 312, so that the energy storage capacitor 311 can be discharged and generate a pulse current.

[0048] See also Figure 2 , Figure 3 and Figure 4In some embodiments, the discharge switch 312 is configured as a thyristor T1. The pulse transformer 221 is configured as a transformer B1. The energy storage capacitor 311 is configured as a capacitor C1. In this way, the discharge unit 31 is turned on or off by the thyristor T1, which can achieve the effects of no electric shock, rapid action, long life and almost no maintenance. In addition, in this embodiment, the transformer B1 can be arranged close to the corresponding thyristor T1 to better cooperate with the work of the thyristor T1 power regulator and improve the energy utilization efficiency and stability of the entire system.

[0049] In this embodiment, in order to make the thyristor T1 turn on quickly and reliably, a trigger current with a sufficiently large amplitude and a steep pulse front must be provided to the gate of the thyristor T1. In this embodiment, more energy storage can be achieved by increasing the capacitance value of the capacitor C1 to increase the amplitude of the trigger current of the thyristor T1. Alternatively, a transformer B1 with a high coupling coefficient and low distributed parameters is selected to reduce attenuation, and the amplitude of the trigger current of the thyristor T1 can also be increased. Alternatively, the trigger control signal sent by the control board 21 passes through the field effect tube M1 to achieve high-speed switching, and after passing through the transformer B1 and the capacitor C1, a trigger current with a steep pulse front is provided to the thyristor T1.

[0050] Continue reading Figure 4 In some embodiments, a freewheeling diode D1 is connected in parallel at both ends of the energy storage capacitor 311. Specifically, a freewheeling diode D1 is connected in parallel at both ends of the capacitor C1. In this way, by connecting a freewheeling diode D1 in parallel at both ends of each capacitor C1 used for energy storage, reverse discharge can be prevented from damaging the energy storage capacitor 311.

[0051] Continue reading Figure 3 In some embodiments, equal resistors R1 are connected in parallel at both ends of each discharge switch 312. Specifically, equal resistors R1 are connected in parallel at both ends of the thyristor T1. It should be noted that in order to make the voltage distribution on each thyristor T1 uniform, equal resistors R1 are connected in parallel on the valve plate of each thyristor T1 to achieve static uniform protection of each thyristor T1 and improve the safety and stability of the device.

[0052] Further, the two ends of the discharge switch 312 are connected in parallel with an RCD buffer circuit. Specifically, the RCD buffer circuit is composed of a resistor R2 and a capacitor C2, and the RCD buffer circuit is connected in parallel at both ends of the thyristor T1. In this embodiment, while selecting appropriate device parameters as much as possible, in order to obtain a better voltage balancing effect and ensure device safety, an RCD buffer circuit can be connected in parallel at both ends of the thyristor T1, so that the overvoltage caused by the gate drive signal delay and the different recovery time during the reverse recovery charge can be effectively reduced. The working principle of the RCD buffer circuit is to use the property that the voltage of the capacitor C2 cannot change suddenly to slow down the rapid change of the voltage on the power electronic device, realize dynamic voltage balancing, and improve the stability of the device. The RCD buffer circuit connected in parallel at both ends of the thyristor T1, in addition to the dynamic voltage balancing effect, also has the functions of overvoltage protection in some cases, which has been uniformly considered when designing the circuit.

[0053] In some embodiments, a varistor R3 is connected in parallel at both ends of the discharge switch 312. Specifically, the varistor R3 is connected in parallel at both ends of the thyristor T1. It should be noted that when a transient overvoltage occurs in the circuit of the discharge unit 31, the varistor R3 and the protected equipment and components are subjected to the overvoltage at the same time, and the response speed of the varistor R3 used is at the ns level, which can effectively limit the voltage, thereby protecting the equipment and components from the impact of overvoltage and improving the safety of the device.

[0054] For further information, see Figure 3 A T-type loop is provided between the transformer B1 and the thyristor T1, and the T-type 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 device; the diode D2 mainly plays a protective role, and is unidirectionally conducted to prevent reverse discharge from damaging the device.

[0055] Continue reading Figure 2 In some embodiments, the discharge unit 31 also includes a discharge inductor 313 and a discharge resistor 314; the discharge switch 312, the discharge inductor 313 and the discharge resistor 314 are electrically connected in sequence, and the end of the discharge resistor 314 away from the discharge inductor 313 is used to be electrically connected to the load 300; the discharge inductor 313 is used to adjust the peak of the discharge current of the energy storage capacitor 311; the discharge resistor 314 is used to adjust the front steepness of the waveform of the discharge current of the energy storage capacitor 311.

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

[0057] Continue reading Figure 1 and Figure 2 , in some embodiments, it also includes a centralized control module 40, which is used to control the charging and power-off 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 discharge of multiple discharge units 31 in sequence. Specifically, the user sends a charging command and a trigger command to the centralized control module 40 through the host computer 200, and the centralized control module 40 sends the charging command to the charging module 10, and the charging module 10 charges the energy storage capacitor 311 in each discharge unit 31. After the charging is completed, the centralized control module 40 sends the trigger command to the trigger control module 20, and each pulse transformer 221 in the trigger control module 20 sequentially outputs a pulse drive current signal, that is, a trigger signal, to sequentially trigger the discharge switch 312 in each discharge unit 31 to turn on, so that the charged energy storage capacitor 311 discharges. In this way, by setting the centralized control module 40, it is convenient to control the charging and discharging operations of the pulse shaping module 30 by the charging module 10 and the trigger control module 20, avoid mis-triggering the pulse shaping module 30, and improve the anti-interference ability.

[0058] continue 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 centralized control module 40. In this embodiment, the energy storage capacitor 311, the discharge switch 312, the discharge inductor 313 and the discharge resistor 314 are connected in series in sequence and form a loop with the load 300. The current sensor 315 is connected between the discharge resistor 314 and the load 300 to detect the peak and pulse width of the pulse current output by the discharge unit 31.

[0059] continue Figure 2 and Figure 3, in some embodiments, it also includes an energy dissipation module 50, the energy dissipation module 50 is electrically connected between the central control module 40 and the pulse forming module 30, and the energy dissipation module 50 is used to discharge energy from each discharge unit 31 that has been charged and not fully discharged. Specifically, the energy dissipation module 50 refers to a device used to consume the electric energy of the energy storage capacitor 311 in the discharge unit 31. The energy dissipation module 50 can be a device composed of an IGBT module, a diode or a resistor. By electrically connecting the energy dissipation module 50 between the central control module 40 and the pulse forming module 30. It should be noted that the trigger operation status can be monitored by the central control module 40. When the central control module 40 determines that each discharge unit 31 is fully charged, but each discharge unit 31 does not receive a trigger signal, the central control module 40 controls the energy dissipation module 50 to discharge the energy storage capacitor 311 in the discharge unit 31. Alternatively, when the centralized control module 40 determines that each discharge unit 31 is fully charged and has completed discharge, the centralized control module 40 controls the energy dissipation module 50 to discharge the remaining charge in each energy storage capacitor 311. In this way, by providing the energy dissipation module 50, the circuit and device safety of the discharge unit 31 can be protected and the service life can be improved.

[0060] See also Figure 1 , Figure 2 and Figure 5 Based on the same inventive concept, the embodiment of the present application also provides a control method for a pulse current generating device, the pulse current generating device includes a charging module 10, a trigger control module 20 and a pulse shaping module 30; the control method of this embodiment includes:

[0061] S10: receiving a charging command and a triggering command.

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

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

[0064] In this embodiment, the charging command may include charging parameters such as charging voltage and charging time. The trigger command may include trigger timing and trigger delay. Specifically, the user sends a charging command and a trigger command to the pulse current generating device through the host 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 sequentially outputs a pulse drive current signal, i.e., a trigger signal, to sequentially trigger the discharge switch 312 in each discharge unit 31 to turn on, so that the charged energy storage capacitor 311 is discharged, so that each discharge unit 31 sequentially outputs a corresponding pulse current. See Figure 6 In a specific embodiment, the pulse shaping module 30 uses 6 discharge units 31, and the trigger control module 20 triggers the 6 discharge units 31 in sequence according to the trigger timing P1, P2, P3, P4, P5, and P6. In this way, the waveforms of the pulse currents output by each discharge unit 31 are superimposed to obtain a large pulse current with a wider pulse width and a higher peak value, and the current peak value and output pulse width of the output current waveform can be adjusted by adjusting the trigger timing of different branches.

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

[0066] In this embodiment, the peak value, rising edge, and falling edge data of a single output can be obtained by performing a discharge test on the circuit of a single discharge unit 31, and the delay between the discharge units 31 can be calculated according to the relationship between the falling edge and the peak value of the preceding discharge unit 31 and the relationship between the rising edge and the peak value of the succeeding discharge unit 31, and 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 discharge peak value is set to X (X>Xmax), the rising edge is set to Tup, and the falling edge is set to Tdown. Take the trigger delay between the first discharge unit 31 and the second discharge unit 31 as T12, fit the pulse current waveform of the first discharge unit 31 with the pulse current waveform of the second discharge unit 31, so that the falling edge of the first discharge unit 31 and the rising edge of the second discharge unit 31 partially overlap, when X = 1.05Xmax, trigger the second discharge unit 31 (the trigger delay at this time is T12), at this time the pulse current of the second discharge unit 31 is superimposed on the pulse current of the first discharge unit 31, ensuring that the real-time current exceeds 1.05Xmax. Similarly, when the superimposed current reaches 1.05Xmax, the subsequent discharge unit 31 is triggered, and current superposition compensation is performed to obtain a high peak value and long pulse width output current.

[0067] It should be noted that when a larger pulse current is required, the trigger delay between different branches, i.e., the discharge unit 31, can be reduced to allow the multi-channel current waveforms to be superimposed faster, thereby generating a larger pulse current. When a longer current pulse width is required, the trigger delay between different branches can be appropriately increased, the peak currents of each branch can be staggered and evenly superimposed, thereby obtaining a longer current pulse width.

[0068] See also Figure 7 and Figure 8 , Figure 7The waveform diagram of the conventional pulse current is shown in FIG. Figure 8 The waveform diagram of the pulsed large current output by the control method based on the embodiment of the present application is shown. The traditional pulse current waveform shows a rapid rise and fall trend, and the pulse width at the peak is short. In order to obtain a long pulse width and large current, it is necessary to increase the discharge energy to obtain an output waveform of "current peak value>100kA for a duration of not less than 1.5ms". The current peak needs to reach 200kA or even higher, which poses a challenge to the selection of various capacitors, resistors and other components. Based on the pulsed large current waveform output by the control method of this embodiment, when the peak of the pulse current output by the first discharge unit 31 begins to decline, the second discharge unit 31 is triggered, and the two waveforms are superimposed. When the superimposed waveform declines, the third discharge unit 31 is triggered, and so on. By superimposing 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 by the trigger timing, which is not only convenient to adjust, but also has low difficulty in component selection, and a wide range of component models can be selected.

[0069] In summary, the embodiment of the present application charges each discharge unit 31 according to the charging command through the charging module 10. After the charging stops, 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 the corresponding pulse current in sequence. In this way, by modifying the trigger delay between different branches, that is, the discharge unit 31, the effect of adjusting the waveform peak and pulse width of the output current is achieved. When a larger pulse current is required, the trigger delay between different branches, that is, the discharge unit 31, can be reduced, so that the multi-channel current waveform can be superimposed faster, thereby generating a larger pulse current. When a longer current pulse width is required, the trigger delay between different branches can be appropriately increased, the peak currents of each branch can be staggered and evenly superimposed, thereby obtaining a longer current pulse width. In addition, the pulse drive current signal required by the discharge unit 31 when the pulse discharge is triggered is generated by the pulse transformer 221. At the same time, the control board 21 and the discharge unit 31 are isolated by the pulse transformer 221, and the circuit anti-interference ability and reliability are effectively improved through reasonable circuit layout.

[0070] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present 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 used to receive a charging command and charge the plurality of discharge units; The trigger control module is used to receive a trigger command and trigger the multiple charged discharge units in sequence in order to make the multiple discharge units output corresponding pulse currents in sequence.

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; Wherein, 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: 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.

4. The pulse current generating device according to claim 3, 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.

5. The pulse current generating device according to claim 3, characterized in that: Two ends of each of the discharge switches are connected in parallel with a resistor of equal value; 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.

6. The pulse current generating device according to claim 3, characterized in that: The discharge unit further includes 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 away from the discharge inductor is used to be electrically connected to a load; The discharge inductor is used to adjust the peak value 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.

7. The pulse current generating device according to any one of claims 1 to 6, 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.

8. The pulse current generating device according to claim 7, characterized in that: The output end of each of the discharge units is electrically connected to a current sensor, and the current sensor is electrically connected to the centralized control module.

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

10. A control method for a pulse current generating device, characterized in that: The pulse current generating device comprises a charging module, a trigger control module and a pulse shaping module; the control method comprises: Receive charging commands and triggering 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.

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