Full-thyristor-controlled multi-module pulse transformer shaping circuit and control method

Abstract

The invention discloses a full-thyristor-controlled multi-module pulse transformer shaping circuit and a control method, and belongs to the technical field of pulse power. Which comprises a plurality of groups of pulse transformer modules which are connected in series, and is characterized in that a bridge circuit is arranged in each group of pulse transformer module, the bridge circuit is connected with a primary winding of a pulse transformer, and secondary windings of the pulse transformers in all the pulse transformer modules are respectively connected with a load in parallel; the bridge circuit comprises two branches which are connected in a staggered manner, the pulse capacitor is connected between the two branches, and the two branches are formed by connecting a plurality of thyristors in series. According to the full-thyristor-controlled multi-module pulse transformer shaping circuit and the control method, accurate regulation and control of current pulses are realized through full-thyristor control, two modes of synchronous parallel discharge and delayed parallel discharge are supported, a non-linear resistor and a capacitor in a full-thyristor bridge type circuit module are combined to limit voltage, a main switch thyristor is protected, and the voltage of the main switch thyristor is reduced. And high-efficiency energy transfer is ensured.

Description

Technical Field

[0001] A fully thyristor-controlled multi-module pulse transformer shaping circuit and control method belong to the field of pulse power technology. Background Technique

[0002] Pulse power technology refers to the formation of pulse signals with both high power and high voltage characteristics by releasing pre-stored energy in a short time, and pulse power technology can be applied in multiple fields. In pulse power technology, common energy storage methods include three forms: inductive energy storage, capacitive energy storage, and mechanical energy storage. Among them, inductive energy storage stands out among many energy storage methods with its efficient energy conversion, fast response speed, durable charge and discharge cycle ability, and compact and lightweight structure design.

[0003] A coupled inductor is a special inductor device composed of two or more coils, which realizes the transfer of energy and signals through the sharing of magnetic fields and mutual inductance effects. When current passes through the coupled inductor, its magnetic field will store a certain amount of energy, which exists in the form of magnetic field. When the current changes, this energy will be released to stabilize the current or generate voltage. In the energy storage stage, the electrical energy provided by the power supply is converted into magnetic energy and stored in the coupled inductor. When energy needs to be released, the magnetic energy is converted back into electrical energy to meet the needs of the load.

[0004] Around the multi-module pulse transformer mode, giving full play to its various advantages, several research methods have been proposed in the prior art: The literature "Hu Changyong, Ba Fengli, Li Haitao, etc. Design and Experiment of Inductive Energy Storage Pulse Power Supply Circuit Based on Improved ICCOS [J]. Cryogenics and Superconductivity, 2023, 51(08): 5-11" proposed that the improved ICCOS module is connected in parallel at both ends of the primary winding, and one of the branches is controlled by a diode; the energy of the inductor L is transferred to C to restore a certain voltage. However, a single-module pulse power supply cannot meet the requirements of different load outputs; high voltage is easily generated when the switch is turned off, and no corresponding voltage limiting measures are taken.

[0005] The literature "Sun Hao, Yu Xinjie, Li Zhen, etc. Analysis and Optimization of Multi-module Inductive Pulse Source System [J]. Transactions of China Electrotechnical Society, 2023, 38(02): 309-316." proposed that in the multi-module inductive pulse power supply system, each single module charges and discharges the load separately. However, only single-module control can be achieved, and series charging and parallel discharging between modules cannot be achieved.

[0006] A technical solution is described in a Chinese invention patent with an application number of 201610036334.3, an application date of January 20, 2016, and a patent title of "A Modular Superconducting Energy Storage Continuous Pulse Power Supply". In this solution, a bridge capacitor conversion circuit is used to collect leakage inductance energy to achieve residual energy recovery and feedback charging. However, after the charging stage of this mode ends, it must discharge immediately, and freewheeling cannot be performed before discharging, which cannot meet the actual working condition requirements; in the multi-module mode with simple parallel connection, the power requirement for the overall primary power supply is relatively high. In addition, series charging between multiple modules cannot be achieved, resulting in a more complex circuit and control and higher costs.

[0007] A technical solution is described in a Chinese invention patent with an application number of 201911294494.8, an application date of December 16, 2019, and a patent title of "An Inductive Energy Storage Pulse Power Supply with Energy Recovery". In this solution, a pulse power supply scheme with coupling between the primary side and the secondary side is achieved by using a pulse transformer, which can increase the discharge current steepness, shorten the discharge period, and improve the energy utilization efficiency. The limitation is that using IGBT as the main switch has a relatively high cost and limited current-carrying capacity, and it is difficult to flexibly adapt to diverse load output requirements.

[0008] A technical solution is described in a Chinese invention patent with an application number of 202410067069.X, an application date of January 17, 2024, and a patent title of "A Multi-module Superconducting Inductance Series Charging and Parallel Discharging Circuit with Delayed Parallel Discharging". In this technical solution, through the IGBT switch combination, series charging and parallel discharging of multi-module energy storage inductors are achieved, and precise amplitude and width modulation of the output pulse can be performed to meet diverse load requirements and provide flexible pulse output capabilities. However, the circuit involves multiple superconducting energy storage inductor unit modules and a large number of switches. Using IGBT as the main switch has limited current-carrying capacity. When different pulse amplitudes and widths need to be output, more modules need to be added for superposition, increasing the complexity of the circuit structure. Summary of the Invention

[0009] The technical problem to be solved by the present invention is: overcoming the deficiencies of the prior art, providing a multi-module pulse transformer shaping circuit and control method with full thyristor control to achieve precise regulation of current pulses, jointly limiting voltage by non-linear resistors and capacitors in the full thyristor bridge circuit module to protect the main switch thyristor and ensure efficient energy transfer.

[0010] The technical solution adopted by the present invention to solve its technical problems is as follows: The fully thyristor-controlled multi-module pulse transformer shaping circuit includes multiple groups of pulse transformer modules connected in series. A pulse transformer is provided in each group of pulse transformer modules. The primary charging power supply is connected in parallel across both ends of all pulse transformer modules. It is characterized in that: A bridge circuit is provided in each group of pulse transformer modules. The bridge circuit is connected to the primary winding of the pulse transformer. The secondary windings of the pulse transformers in all pulse transformer modules are respectively connected in parallel with the load; The bridge circuit includes two branches connected in an interleaved manner. A pulse capacitor is connected between the two branches. Both branches are branches in which multiple thyristors are connected in series.

[0011] Preferably, in the first branch of the two branches, the cathode of the fourth thyristor is connected to one end of the pulse capacitor and the anode of the third thyristor in the second branch. The cathode of the second thyristor in the second branch is connected to the other end of the pulse capacitor and the anode of the first thyristor; The cathodes of the third thyristor and the first thyristor are connected to the primary winding of the pulse transformer.

[0012] Preferably, a non-linear resistor for voltage limiting is also connected in parallel across both ends of the pulse capacitor.

[0013] Preferably, in each group of pulse transformer modules, a freewheeling diode is also connected in parallel across both ends of the bridge circuit and the primary winding of the pulse transformer.

[0014] A control method implemented by a fully thyristor-controlled multi-module pulse transformer shaping circuit, characterized in that: It includes the following steps: Step a, pre-charge the pulse capacitors in each group of pulse transformer modules; Step b, control the first thyristor and the second thyristor in each group of pulse transformer modules to conduct, and the primary charging power supply charges the primary windings in all pulse transformer modules in series; Step c, according to the control instruction, determine to execute the parallel discharge process or the delayed parallel discharge process; Step d, determine whether the charge-discharge operation cycle is completed. If it is completed, end. Otherwise, return to step b.

[0015] Preferably, the parallel discharge process includes the following steps: Step c-1, trigger the third thyristor in each group of pulse transformer modules to conduct. The pre-charging voltage of the pulse capacitor in each group of pulse transformer modules forces the first thyristor to turn off, and a discharge circuit is formed on the primary winding side loop of the pulse transformer; Step c-2, the primary winding current in each group of pulse transformer modules decays rapidly through the capacitor. At the same time, the non-linear resistor and the capacitor jointly limit the voltage of the energy storage inductor or the first thyristor, and current pulses are induced on the secondary winding at the same time, and discharge in parallel to the load; Step c-3: After the reverse voltage of the pulse capacitor in each group of pulse transformer modules reaches the peak value, the second thyristor and the third thyristor bear the reverse voltage and turn off, and the secondary current feeds the load along the discharge circuit; Step c-4: Trigger the first thyristor and the fourth thyristor in each group of pulse transformer modules to conduct, and the primary charging power supply and the pulse capacitor jointly recharge the primary winding, and the primary winding recovers the remaining energy of the secondary winding; Step c-5: Under the coupling effect, after the loop current on the secondary winding side decreases to zero, the thyristor on the load side turns off naturally, and all the energy in the primary winding is transferred to the corresponding pulse capacitor, and the pulse capacitor is charged forward again, and then return to step d.

[0016] Preferably, the delayed parallel discharge process includes the following steps: Step c'-1: The 1st to the (N-1)th pulse transformer modules are turned on to form a discharge circuit, and the pre-charging voltage across the pulse capacitor in the corresponding pulse transformer module forces the first thyristor to turn off, and a discharge circuit is formed on the primary winding side of the pulse transformer; Step c'-2: The primary winding currents in the first (N-1) pulse transformer modules decay rapidly through the corresponding capacitors, and current pulses are induced in the secondary windings at the same time, and they are discharged in parallel to the load R L while the non-linear resistor and the capacitor jointly limit the voltage of the energy storage inductor or the first thyristor; Step c'-3: After the reverse voltage of the pulse capacitor in the 1st to the (N-1)th pulse transformer modules reaches the peak value, the second thyristor and the third thyristor in the 1st to the (N-1)th pulse transformer modules bear the reverse voltage and turn off, and the primary and secondary currents in the 1st to the (N-1)th pulse transformer modules feed the load along the discharge circuit; Step c'-4: The first thyristor in the Nth pulse transformer module conducts, and a freewheeling circuit is formed in the Nth pulse transformer module; Step c'-5: The third thyristor in the Nth pulse transformer module conducts, and the non-linear resistor on the primary winding side limits the voltage of the capacitor appropriately, and a current pulse is induced in the secondary winding, and then return to step c-3.

[0017] Compared with the prior art, the beneficial effects of the present invention are: In the fully thyristor-controlled multi-module pulse transformer shaping circuit and control method of the present invention, precise regulation of current pulses is achieved through full thyristor control, supporting two modes of synchronous parallel discharge and delayed parallel discharge. The non-linear resistor and the capacitor in the fully thyristor bridge circuit module jointly limit the voltage to protect the main switch thyristor and ensure efficient energy transfer.

[0018] In the fully thyristor-controlled multi-module pulse transformer shaping circuit and control method, the circuit flexibly controls the charging and discharging processes of each module through series and parallel connections, can effectively recover the remaining energy, and improve the overall efficiency of the system.

[0019] The remaining energy in the primary winding and secondary winding can be rapidly recovered accordingly, improving the charging efficiency and energy transmission efficiency, and at the same time avoiding a large amount of remaining energy in the primary winding.

[0020] By setting a freewheeling diode, freewheeling can be achieved: after the current charging and discharging stage of the primary winding of the pulse transformer is completed, if there is no instruction in the next stage, the primary winding of the pulse transformer will freewheel through the unidirectional conduction freewheeling diode branch.

[0021] The pulse transformer uses a capacitor and a non-linear resistor to jointly limit the voltage, so that no high-amplitude voltage pulse will appear during the instant discharge of the primary winding, reducing the requirements of the system for the breaking switch. Description of the Drawings

[0022] Figure 1 It is the schematic diagram of the fully thyristor-controlled multi-module pulse transformer shaping circuit.

[0023] Figure 2 It is the flow chart of the control method of the fully thyristor-controlled multi-module pulse transformer shaping circuit.

[0024] Figures 3 to 9 It is the schematic diagram of the synchronous parallel discharge process circuit of the fully thyristor-controlled multi-module pulse transformer shaping circuit.

[0025] Figures 10 to 14 It is the schematic diagram of the delayed parallel discharge process circuit of the fully thyristor-controlled multi-module pulse transformer shaping circuit. Detailed Embodiments

[0026] Figures 1 to 14 It is the best embodiment of the present invention. The following further describes the present invention in conjunction with the attached Figures 1 to 14 to further illustrate the present invention.

[0027] The continuous pulse shaping circuit based on a multi-module pulse transformer includes a plurality of pulse transformer modules. The plurality of pulse transformer modules share a primary charging power supply. Each group of pulse transformer modules includes a plurality of switching devices S n-1 ~S n-4 , freewheeling diodes D n and pulse transformers M n , where n is the number of pulse transformer modules. The switching devices S n-1 ~S n-4 are implemented by thyristors.

[0028] Specifically: In each group of pulse transformer modules, the cathode of the freewheeling diode D n is simultaneously connected to the anodes of the thyristors S n-4 , S n-2 . The cathode of the thyristor S n-4 is simultaneously connected to one end of the capacitor C n , one end of the non-linear resistor R n and the anode of the thyristor S n-3 . The cathode of the thyristor S n-2 is simultaneously connected to the other end of the capacitor C n , the other end of the non-linear resistor R n and the anode of the thyristor S n-1 . The cathodes of the thyristors S n-3 and S n-1 are simultaneously connected to the same-named end of the primary winding L n in the pulse transformer M n-1 . The opposite-named end of the primary winding L n in the pulse transformer M n-1 is connected to the anode of the freewheeling diode D n . In the secondary winding of the pulse transformer M n , the same-named end of the secondary winding L n-2 is connected to the cathode of the thyristor S n-5 . The anode of the thyristor S n-5 is connected in series with the load R L and then connected to the opposite-named end of the secondary winding L n-2 .

[0029] The opposite-named end of the primary winding L n-1 is simultaneously connected to the anodes of the thyristors S （n+1）-2 , S （n+1）-4 in the next group of pulse transformer modules, realizing the series connection of multiple pulse transformer modules. The primary charging power supply is connected in parallel across the two ends of the series-connected multiple pulse transformer modules.

[0030] As Figure 1 shown, taking three groups (n = 1, 2, 3) of pulse transformer modules as an example for detailed description: In the first group of pulse transformer modules, the cathode of the freewheeling diode D 1 is simultaneously connected to the anodes of the thyristors S 1-4 , S 1-2 . The cathode of the thyristor S 1-4 is simultaneously connected to one end of the capacitor C 1 , one end of the non-linear resistor R 1 and the anode of the thyristor S 1-3 . The cathode of the thyristor S 1-2 is simultaneously connected to the other end of the capacitor C 1 ​1 and the other end of 1-1 and the anode of thyristor S 1-3 and thyristor S 1-1 and the cathode of thyristor S are simultaneously connected to the primary winding L 1 in the pulse transformer M 1-1 at the same name terminal. The non - same name terminal of the primary winding L 1 in the pulse transformer M 1-1 is connected to the anode of the free - wheeling diode D 1 in the pulse transformer M. In the secondary winding of the pulse transformer M 1 the same name terminal of the secondary winding L 1-2 is connected to the cathode of thyristor S 1-5 and the anode of thyristor S is connected in series with the load R 1-5 and then connected to the non - same name terminal of the secondary winding L L 1-2 1-1 non - same name terminal.

[0031] The non - same name terminal of the primary winding L 1-1 is simultaneously connected to the anodes of thyristor S 2-4 and thyristor S 2-2 in the second group of pulse transformer modules. In the second group of pulse transformer modules 2 the cathode of the free - wheeling diode D 2-4 is simultaneously connected to the anodes of thyristor S 2-2 and thyristor S 2-4 the cathode of thyristor S is simultaneously connected to one end of the capacitor C 2 one end of the non - linear resistor R 2 and the anode of thyristor S 2-3 The cathode of thyristor S 2-2 is simultaneously connected to the other end of the capacitor C 2 the other end of the non - linear resistor R 2 and the anode of thyristor S 2-1 the cathode of thyristor S 2-3 and thyristor S 2-1 are simultaneously connected to the same name terminal of the primary winding L 2 in the pulse transformer M 2-1 The non - same name terminal of the primary winding L 2 in the pulse transformer M 2-1 is connected to the anode of the free - wheeling diode D 2 in the pulse transformer M. In the secondary winding of the pulse transformer M 2 the same name terminal of the secondary winding L 2-2 is connected to the cathode of thyristor S 2-5 the anode of thyristor S is connected in series with the load R 2-5 and then connected to the non - same name terminal of the secondary winding L L 2-2 non - same name terminal.

[0032] ​Primary winding L 2-1 The non - corresponding ends of the primary winding L are simultaneously connected to the thyristors S 3-4 、thyristor S 3-2 anodes in the third group of pulse transformer modules. In the third group of pulse transformer modules, the cathode of the free - wheeling diode D 3 is simultaneously connected to the thyristors S 3-4 、thyristor S 3-2 anodes. The cathode of the thyristor S 3-4 is simultaneously connected to one end of the capacitor C 3 , one end of the non - linear resistor R 3 and the anode of the thyristor S 3-3 . The cathode of the thyristor S 3-2 is simultaneously connected to the other end of the capacitor C 3 , the other end of the non - linear resistor R 3 and the anode of the thyristor S 3-1 . The cathodes of the thyristors S 3-3 and the thyristor S 3-1 are simultaneously connected to the corresponding end of the primary winding L 3 in the pulse transformer M 3-1 . The non - corresponding end of the primary winding L 3 in the pulse transformer M 3-1 is connected to the anode of the free - wheeling diode D 3 . In the secondary winding of the pulse transformer M 3 , the corresponding end of the secondary winding L 3-2 is connected to the cathode of the thyristor S 3-5 . The anode of the thyristor S 3-5 is connected in series with the load R L and then connected to the non - corresponding end of the secondary winding L 3-2 .

[0033] The positive pole of the primary charging power supply U s is connected to the anodes of the thyristors S 1-4 、thyristor S 1-2 in the first group of pulse transformer modules. The negative pole of the primary charging power supply U s is connected to the non - corresponding end of the primary winding L 3 in the pulse transformer M 3-1 in the third group of pulse transformer modules.

[0034] Based on Figure 1 the continuous pulse shaping circuit based on multi - module pulse transformers shown, according to different discharge modes, during its operation, it can be divided into synchronous parallel discharge mode and delayed parallel discharge mode.

[0035] Based on Figure 2 the control method of the fully thyristor - controlled multi - module pulse transformer shaping circuit shown, includes the following steps: Step 1001, pre-charge; For each pulse capacitor in each group of pulse transformer modules: capacitance C 1 ~ C 3 Perform pre-charge, as Figure 3 shown.

[0036] Step 1002, form a charging circuit; Trigger the thyristors S n-1 、S n-2 in each group of pulse transformer modules to conduct, so that the primary charging power supply U s charges the primary winding L 1-1 ~ L 3-1 (primary winding) in series. The positive pole of the primary charging power supply U s successively passes through thyristor S 1-2 - thyristor S 1-1 - primary winding L 1-1 - thyristor S 2-2 - thyristor S 2-1 - primary winding L 2-1 - thyristor S 3-2 - thyristor S 3-1 - primary winding L 3-1 to form a charging circuit with the negative pole of the primary charging power supply U s , as Figure 4 shown.

[0037] Step 1003, determine the discharge mode; According to the control instruction, determine to execute the parallel discharge mode described in Steps 1004~1008, or the delayed parallel discharge mode described in Steps 1010~1014.

[0038] Step 1004, form a discharge circuit; Trigger the thyristor S n-3 in each group of pulse transformer modules to conduct. The pre-charge voltage of the capacitor C n in each group of pulse transformer modules forces the thyristor S n-1 to turn off, and a discharge circuit as shown in Figure 5 is formed on the primary winding side loop of the pulse transformer: U s 's positive pole - thyristor S 1-2 - capacitor C 1- Parallel thyristor S 1-3 - Primary winding L 1-1 - Thyristor S 2-2 - Capacitor C 2 - Parallel thyristor S 2-3 - Primary winding L 2-1 - Thyristor S 3-2 - Capacitor C 3 - Parallel thyristor S 3-3 - Primary winding L 3-1 With the primary charging power supply U s The negative pole of.

[0039] Step 1005, discharge the load in parallel; While the current of the primary winding decays rapidly through the capacitor, thyristor S n-5 is triggered, and at the same time, a current pulse is induced in the secondary winding, which discharges the load R in parallel L , and at the same time, the non-linear resistor and the capacitor jointly limit the voltage of the energy storage inductor, as Figure 6 shown.

[0040] Step 1006, feed the secondary current to the load along the discharge circuit; The capacitor in each pulse transformer module C n After the reverse voltage reaches the peak value, thyristor S n-2 and S n-3 are forced to turn off by the reverse voltage. At this time, there is no current path in the primary circuit, and only the secondary current feeds the load R along the discharge circuit L , as Figure 7 shown.

[0041] Step 1007, the primary winding quickly recovers the remaining energy of the secondary winding; Trigger thyristor S in each pulse transformer module n-4 、S n-1 to conduct, and the primary charging power supply U s and the capacitor C n jointly recharge the primary winding L 1-1 ~ L 3-1 Quickly recover the remaining energy of the secondary winding, forming a circuit as shown in Figure 8 : The positive pole of the primary charging power supply U s - Thyristor S 1-4 - CapacitorC 1 - Thyristor S 1-1 - Primary winding L 1-1 - Thyristor S 2-4 - Capacitor C 2 - Thyristor S 2-1 - Primary winding L 2-1 - Thyristor S 3-4 - Capacitor C 3 - Thyristor S 3-1 - Primary winding L 3-1 - U s negative electrode of

[0042] Step 1008, transfer of capacitor energy; Under the coupling effect, after the current in the secondary winding loop decreases to zero, the thyristor on the load R L side naturally turns off, and at the same time the primary winding L 1-1 ~ L 3-1 All the energy in is transferred to the corresponding capacitor C n so that the capacitor C n is charged to a certain positive voltage again, as shown in Figure 9 shown.

[0043] Step 1009, determine whether the operation cycle is completed; Determine whether the operation cycle is completed. If it is completed, execute Step 1015. Otherwise, return to Step 1002, and after executing Step 1002 to Step 1003, execute Step 1010.

[0044] Step 1010, the first N - 1 pulse transformer modules are turned on to form a discharge circuit; The first N - 1 pulse transformer modules are turned on to form a discharge circuit. For the capacitor in the corresponding pulse transformer module: capacitor C 1 ~ C 2 The pre - charge voltage forces the thyristors S 1-1 、S 2-1 to turn off, and the circuit on the primary winding side of the pulse transformer is as shown in Figure 10 shown: U s positive electrode of - Thyristor S 1-2 - Capacitor C 1 - Thyristor S 1-3- Primary side winding L 1-1 - Thyristor S 2-2 - Capacitor C 2 - Thyristor S 2-3 - Primary side winding L 2-1 - Thyristor S 3-2 - Thyristor S 3-1 - Primary side winding L 3-1 And the primary charging power supply U s Negative electrode.

[0045] Step 1011, the secondary windings of the first N - 1 pulse transformer modules are connected in parallel to discharge to the load; The primary winding current in the first N - 1 pulse transformer modules decays rapidly through the corresponding capacitors, and current pulses are induced in the secondary windings simultaneously, and they are connected in parallel to discharge to the load R L Discharge, and at the same time, the non - linear resistor and the capacitor jointly limit the voltage of the energy storage inductor as Figure 11 Shown.

[0046] Step 1012, the secondary current of the first N - 1 pulse transformer modules feeds power to the load along the discharge circuit; The capacitors in the first N - 1 pulse transformer modules: (capacitor C 1 ~ C 2 ) After the reverse voltage reaches the peak value, thyristors S 1-2 、S 1-3 、thyristor S 2-2 、thyristor S 2-3 Are forced to turn off by the reverse voltage. At this time, there is no current path in the primary circuit of the first N - 1 pulse transformer modules, and only the secondary current feeds power to the load R along the discharge circuit L At the same time, the thyristor S in the Nth pulse transformer module n-1 , that is, thyristor S 3-1 Remains conducting, and the primary winding L 3-1 - Free - wheeling diode D 3 - Thyristor S 3-2 - Thyristor S 3-1 Form a free - wheeling circuit, as Figure 12 Shown. After a certain delay, it enters Step 1013.

[0047] Step 1013, discharge in the Nth pulse transformer module; The thyristor S in the Nth pulse transformer module n-3 Conducts, that is, trigger thyristor S 3-3Conduct, and a loop as shown in Figure 13 is formed on the primary winding side in the Nth pulse transformer module: the primary winding L 3-1 - freewheeling diode D 3 - thyristor S 3-2 - capacitor C 3 - thyristor S 3-3 .

[0048] Step 1014, induce a current pulse in the secondary winding; The non-linear resistor on the primary winding side in the Nth pulse transformer module appropriately limits the voltage of the capacitor, and a current pulse is induced in the secondary winding, as shown in Figure 14 , and then return to step 1006.

[0049] Step 1015, end.

[0050] As mentioned above, it is only the preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A multi-module pulse transformer shaping circuit controlled by a full thyristor, comprising a plurality of groups of pulse transformer modules connected in series, each group of pulse transformer modules being provided with a pulse transformer, and a primary charging power source being connected in parallel at both ends of all pulse transformer modules, characterized in that: A bridge circuit is arranged in each group of pulse transformer modules, and the bridge circuit is connected to the primary winding of the pulse transformer. The secondary windings of the pulse transformers in all pulse transformer modules are respectively connected in parallel with the loads. The bridge circuit includes two branches connected in an alternating manner, and the pulse capacitor is connected between the two branches. Both branches are branches in which multiple thyristors are connected in series.

2. The fully thyristor controlled multi-module pulse transformer shaping circuit according to claim 1, characterized in that: In the first branch of the two branches, the cathode of the fourth thyristor is connected to one end of the pulse capacitor and the anode of the third thyristor in the second branch, and the cathode of the second thyristor in the second branch is connected to the other end of the pulse capacitor and the anode of the first thyristor; The cathode of the third thyristor and the cathode of the first thyristor are connected to the primary winding of the pulse transformer.

3. The fully thyristor controlled multi-module pulse transformer shaping circuit according to claim 1, characterized in that: A nonlinear resistor for limiting the voltage of the pulse capacitor is connected in parallel at both ends of the pulse capacitor.

4. The fully thyristor controlled multi-module pulse transformer shaping circuit according to claim 1, characterized in that: In each group of pulse transformer modules, a freewheeling diode is connected in parallel between the bridge circuit and both ends of the primary winding of the pulse transformer.

5. A control method implemented by the multi-module pulse transformer shaping circuit controlled by a full thyristor according to any one of claims 1 to 4, characterized in that: The steps include: Step a, pre-charging the pulse capacitor in each group of pulse transformer modules; Step b, controlling the first thyristor and the second thyristor in each group of pulse transformer modules to be turned on, and the primary charging power supply charges the primary windings in all pulse transformer modules in series; Step c, determining to execute the parallel discharge process or the delayed parallel discharge process according to the control instruction; Step d, determining whether the charge and discharge operation cycle is completed, if completed, then ending, otherwise returning to step b.

6. The control method according to claim 5, characterized in that: The parallel discharge process includes the following steps: Step c-1, triggering the third thyristor in each group of pulse transformer modules to turn on, the pre-charge voltage of the pulse capacitor in each group of pulse transformer modules forces the first thyristor to turn off, and the primary winding side loop of the pulse transformer forms a discharge loop; Step c-2, the current of the primary winding in each group of pulse transformer modules decays rapidly through the capacitor, and at the same time, the nonlinear resistor and the capacitor jointly limit the voltage of the energy storage inductor or the first thyristor, and the secondary winding simultaneously induces a current pulse and discharges the load in parallel; Step c-3, after the reverse voltage of the pulse capacitor in each group of pulse transformer modules reaches a peak value, the second thyristor and the third thyristor are subjected to the reverse voltage and are turned off, and the secondary current is fed to the load along the discharge loop; Step c-4, triggering the first thyristor and the fourth thyristor in each group of pulse transformer modules to turn on, the primary charging power supply and the pulse capacitor jointly recharge the primary winding, and the primary winding recovers the residual energy of the secondary winding; Step c-5, under the coupling effect, after the secondary winding loop current is reduced to zero, the load-side thyristor is naturally turned off, and all the energy in the primary winding is transferred to the corresponding pulse capacitor. The pulse capacitor is forward charged again and returns to step d.

7. The control method according to claim 6, characterized in that: The delayed parallel discharge process includes the following steps: Step c'-1, the 1st to N-1th pulse transformer modules are turned on to form a discharge loop, and the pre-charge voltage across the pulse capacitor in the corresponding pulse transformer module forces the first thyristor to turn off, forming a discharge loop on the primary winding side of the pulse transformer; Step c'-2, the primary winding currents in the first N-1 pulse transformer modules decay rapidly through the corresponding capacitors, and the secondary windings simultaneously induce current pulses, which are connected in parallel to the load R L Discharging, while the nonlinear resistor and capacitor jointly limit the voltage of the energy storage inductor or the first thyristor; Step c'-3, after the reverse voltage of the pulse capacitor in the 1st to N-1th pulse transformer modules reaches a peak value, the second thyristor and the third thyristor in the 1st to N-1th pulse transformer modules are subjected to the reverse voltage and are turned off, and the primary and secondary currents in the 1st to N-1th pulse transformer modules are fed to the load along the discharge loop; Step c'-4, the first thyristor in the Nth pulse transformer module is turned on, and a freewheeling loop is formed in the Nth pulse transformer module; Step c'-5, the third thyristor in the Nth pulse transformer module is turned on, the nonlinear resistor on the primary winding side appropriately limits the voltage of the capacitor, the secondary winding induces a current pulse, and then returns to step c-3.

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