High-power high-repetition-frequency pulse constant-current discharge circuit and pulse laser power supply

Abstract

The embodiment of the invention discloses a high-power high-repetition-frequency pulse constant-current discharge circuit and a pulse laser power supply, and the high-power high-repetition-frequency pulse constant-current discharge circuit comprises a multi-phase staggered parallel Buck circuit, an energy feedback circuit and a controller. The controller samples current in the multi-phase interleaving Buck circuit so as to perform time sequence trigger control on switching tubes in the multi-phase interleaving Buck circuit and the energy feedback circuit, so that charging and discharging of an energy storage inductor in the multi-phase interleaving Buck circuit and recovery of residual energy of the energy storage inductor after discharging are realized, and energy waste is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of pulse laser power supplies, and in particular to a high-power, high-repetition-rate pulse constant-current discharge circuit and a pulse laser power supply. Background Art

[0002] With the widespread application of lasers in industry, agriculture, medicine, military and other fields, high-power constant current pulse power supplies have also been widely studied as laser driving power supplies. Among them, the post-stage pulse discharge network is an important part of the pulse power supply circuit. Selecting a suitable topology for the pulse discharge network can play an important role in improving the discharge quality of the pulse power supply. However, when the current post-stage pulse discharge network is used for pulse power supply discharge, the initial discharge current is overcharged, and the residual energy of the energy storage inductor cannot be recovered after the pulse ends, resulting in energy waste. Summary of the invention

[0003] The embodiment of the present application provides a high-power, high-repetition-rate pulse constant-current discharge circuit and a pulse laser power supply, which can recover the residual energy of the energy storage inductor through an energy feedback circuit after the pulse ends, thereby reducing energy waste.

[0004] A first aspect of an embodiment of the present application provides a high-power, high-repetition-rate pulse constant-current discharge circuit, which includes a multi-phase interleaved parallel Buck circuit, an energy feedback circuit and a controller. The controller samples the current in the multi-phase interleaved parallel Buck circuit to perform timing triggering control on the switching tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, thereby realizing the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recovery of the residual energy of the energy storage inductor after discharge.

[0005] Exemplarily, the multi-phase interleaved parallel Buck circuit is a two-phase interleaved parallel Buck circuit, which includes an input voltage source, a laser pumping resistor, a first energy storage inductor, a second energy storage inductor, an input energy storage capacitor, a first switch tube, a second switch tube, a first freewheeling diode, and a second freewheeling diode; the positive electrode of the input voltage source is connected to one end of the first switch tube, one end of the second switch tube, and one end of the input energy storage capacitor; the other end of the first switch tube is connected to one end of the first energy storage inductor and the negative electrode of the first freewheeling diode, and the other end of the second switch tube is connected to one end of the second energy storage inductor and the negative electrode of the second freewheeling diode; the other end of the first energy storage inductor and the other end of the second energy storage inductor are connected to one end of the laser pumping resistor; the negative electrode of the input voltage source is connected to the other end of the input energy storage capacitor, the positive electrode of the first freewheeling diode, the positive electrode of the second freewheeling diode, and the other end of the laser pumping resistor.

[0006] Exemplarily, the energy feedback circuit includes a direct rectification energy control diode, a single-channel relay energy switch tube and a synchronous capture switch tube connected in sequence.

[0007] Exemplarily, one end of the direct rectification energy control diode is connected to the positive electrode of the input voltage source, one end of the first switch tube, one end of the second switch tube and one end of the input energy storage capacitor, the other end of the direct rectification energy control diode is connected to the other end of the first energy storage inductor, the other end of the second energy storage inductor and one end of the single-way relay energy switch tube, the other end of the single-way relay energy switch tube is connected to one end of the synchronous capture switch tube and one end of the laser pump resistor; the other end of the synchronous capture switch tube is connected to the negative electrode of the input voltage source, the other end of the input energy storage capacitor, the positive electrode of the first freewheeling diode, the positive electrode of the second freewheeling diode and the other end of the laser pump resistor.

[0008] Exemplarily, the high-power high-repetition-rate pulse constant-current discharge circuit further includes a protection circuit, which samples the current flowing through the laser pump resistor to protect the two-phase interleaved parallel Buck circuit through the controller.

[0009] Exemplarily, the controller controls the single-channel relay energy switch tube and the synchronous capture switch tube to close during the charging stage, and triggers and controls the first switch tube and the second switch tube through an interlaced pulse width modulation signal with a fixed duty cycle, so that the first energy storage inductor and the second energy storage inductor are pre-charged to a desired current value.

[0010] Exemplarily, the fixed duty cycle is determined according to the input voltage source, the first energy storage inductor, the second energy storage inductor, a preset output pulse discharge current and the duration of the charging phase.

[0011] Exemplarily, during the discharge phase, the controller controls the single-channel relay energy switch tube to close and the synchronous capture switch tube to turn off, and triggers and controls the first switch tube and the second switch tube through an interlaced pulse width modulation signal with a duty cycle output by a proportional-integral controller, so that the first energy storage inductor and the second energy storage inductor perform pulse constant current discharge.

[0012] Exemplarily, during the energy feedback stage, the controller controls the single-channel relay energy switch tube to turn off, the synchronous capture switch tube to close, and the first switch tube and the second switch tube to turn off, so that the residual energy after the first energy storage inductor and the second energy storage inductor perform pulse constant current discharge is fed back to the input voltage source through the energy feedback circuit, and the time of the energy feedback stage is determined according to the pulse repetition period, the time of the charging stage, and the time of the discharging stage.

[0013] A second aspect of an embodiment of the present application provides a pulsed laser power supply for powering a laser pump, wherein the pulsed laser power supply includes the high-power and high-repetition-rate pulse constant-current discharge circuit as described in the first aspect.

[0014] The high-power, high-repetition-rate pulse constant-current discharge circuit disclosed in the present application includes a multi-phase interleaved parallel Buck circuit, an energy feedback circuit and a controller. The controller can sample the current in the multi-phase interleaved parallel Buck circuit to perform timing triggering control on the switch tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, thereby realizing the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recovery of the residual energy of the energy storage inductor after discharge, thereby reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A structural block diagram of a high-power high-repetition-rate pulse constant-current discharge circuit provided by an embodiment of the present application is shown; Figure 2 A structural block diagram of a two-phase interleaved parallel Buck circuit provided by an embodiment of the present application is shown; Figure 3 A structural block diagram of an energy feedback circuit provided by an embodiment of the present application is shown; Figure 4 A structural block diagram of a high-power high-repetition-rate pulse constant-current discharge circuit provided by another embodiment of the present application is shown; Figure 5 A schematic diagram showing the operating principle of a high-power high-repetition-rate pulse constant-current discharge circuit provided by an embodiment of the present application is shown; Figure 6 A schematic diagram of a total output current waveform provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] Please refer to Figure 1 , which shows a structural block diagram of a high-power high-repetition-rate pulse constant-current discharge circuit provided by an embodiment of the present application. The high-power high-repetition-rate pulse constant-current discharge circuit may include: a multi-phase interleaved parallel Buck circuit 10, an energy feedback circuit 20 and a controller 30.

[0019] Among them, the multi-phase interleaved parallel Buck circuit 10 is connected to the energy feedback circuit 20, and the controller 30 can sample the current of the multi-phase interleaved parallel Buck circuit 10, which refers to the current flowing through each Buck circuit, and is also the current flowing through the energy storage inductor in each Buck circuit. By sampling the current, the multi-phase interleaved parallel Buck circuit 10 and the switch tube in the energy feedback circuit 20 are time-triggered and controlled to realize the charging and discharging of the energy storage inductor. When charging the energy storage inductor, the energy storage inductor may be overcharged, resulting in that when the energy storage inductor is discharged, the stored electric energy cannot be fully released. Therefore, after the pulse ends, the closing and opening of the switch tube in the multi-phase interleaved parallel Buck circuit 10 and the energy feedback circuit 20 can be controlled, so that the residual energy of the energy storage inductor is fed back to the input side through the energy feedback circuit 20 to realize energy recovery.

[0020] Among them, the multi-phase interleaved parallel Buck circuit connects the output voltages of multiple Buck circuits in parallel, and controls the phase difference of each Buck circuit to make its output current staggered. Its basic principle is that only one Buck circuit is in the on state at each moment, and the other circuits are in the off state, so as to achieve effective control of the inductor current. Compared with the traditional Buck circuit, the interleaved parallel Buck circuit can reduce the fluctuation amplitude of the inductor current and improve the efficiency and stability of the circuit. Here, the multi-phase interleaved parallel Buck circuit refers to two or more Buck circuits.

[0021] Among them, the energy feedback circuit is a circuit used to return excess electrical energy in the system to a power supply or storage device.

[0022] The controller may include one or more of a microprocessor, a digital signal processor, a programmable logic controller, etc., and the control strategy of the controller may be one or more of proportional integral control, sliding mode control, fuzzy control, and adaptive control.

[0023] It can be seen that the high-power, high-repetition-rate pulse constant-current discharge circuit disclosed in the present application includes a multi-phase interleaved parallel Buck circuit, an energy feedback circuit and a controller. The controller can sample the current in the multi-phase interleaved parallel Buck circuit to perform timing triggering control on the switch tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, thereby realizing the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recovery of the residual energy of the energy storage inductor after discharge, thereby reducing energy waste.

[0024] In a specific embodiment of the present application, the multi-phase interleaved parallel Buck circuit is a two-phase interleaved parallel Buck circuit. Figure 2 , which shows a structural block diagram of a two-phase interleaved parallel Buck circuit provided by an embodiment of the present application. The two-phase interleaved parallel Buck circuit 10 includes an input voltage source Vin, a laser pump resistor R, a first energy storage inductor L1, a second energy storage inductor L2, an input energy storage capacitor C, a first switch tube S1, a second switch tube S2, a first freewheeling diode D1, and a second freewheeling diode D2.

[0025] The positive electrode Vin of the input voltage source is connected to one end of the first switch tube S1, one end of the second switch tube S2 and one end of the input energy storage capacitor C; the other end of the first switch tube S1 is connected to one end of the first energy storage inductor L1 and the negative electrode of the first freewheeling diode D1, and the other end of the second switch tube S2 is connected to one end of the second energy storage inductor L2 and the negative electrode of the second freewheeling diode D2; the other end of the first energy storage inductor L1 and the other end of the second energy storage inductor L2 are connected to one end of the laser pumping resistor R; the negative electrode of the input voltage source Vin is connected to the other end of the input energy storage capacitor C, the positive electrode of the first freewheeling diode D1, the positive electrode of the second freewheeling diode D2 and the other end of the laser pumping resistor R.

[0026] Among them, the switch tube is an electronic component, which is mainly used to control the flow or disconnection of current in the circuit. The switch tube in this application can be a bipolar transistor or a field effect transistor, which is not limited here. If it is a bipolar transistor, it can be an insulated gate bipolar transistor; if it is a field effect transistor, it can be a junction field effect transistor or an insulated gate field effect transistor.

[0027] Please refer to Figure 3 , which shows a structural block diagram of an energy feedback circuit provided by an embodiment of the present application. The energy feedback circuit 20 includes a direct rectifier energy control diode Drec, a single-channel relay energy switch tube Srec and a synchronous capture switch tube Ssh connected in sequence.

[0028] Among them, the positive electrode of the direct rectification energy control diode Drec is connected to one end of the single-channel relay energy switch tube Srec, and the other end of the single-channel relay energy switch tube Srec is connected to the synchronous capture switch tube Ssh.

[0029] Among them, direct rectifier energy control (Drec) is a control technology used in power electronic systems, mainly used to improve the efficiency and stability of the system. Drec technology achieves precise management and optimization of the power system by directly controlling the energy flow of the rectifier. The rectifier is usually composed of multiple switching tubes (such as MOSFET or IGBT), which achieve DC output through specific control strategies. In one embodiment provided in the present application, it is composed of diodes.

[0030] Among them, the single relay energy control (Srec) is a device used for energy control in power systems, which mainly uses relays to realize the switching control of circuits. Relays are electrically controlled switches that control the closing and opening of contacts by energizing and de-energizing the coil.

[0031] Among them, the synchronous sampling switch (Ssh) is an electronic switch technology used for high-precision sampling and signal processing. It is widely used in many high-performance electronic systems, especially in situations where precise control and high-speed sampling are required. Ssh technology ensures the accuracy and reliability of the sampled signal by synchronously controlling the on and off of the switch tube. Ssh usually uses high-speed switch tubes, such as MOSFET or JFET, which have low on-resistance and fast switching speed. The on and off of the switch tube is driven by a control signal (usually a clock signal).

[0032] Please refer to Figure 4 , which shows a structural block diagram of a high-power high-repetition-rate pulse constant-current discharge circuit provided by another embodiment of the present application. The high-power high-repetition-rate pulse constant-current discharge circuit may include: a two-phase staggered parallel Buck circuit 10, an energy feedback circuit 20 and a controller 30.

[0033] The two-phase interleaved parallel Buck circuit 10 includes an input voltage source Vin, a laser pump resistor R, a first energy storage inductor L1, a second energy storage inductor L2, an input energy storage capacitor C, a first switch tube S1, a second switch tube S2, a first freewheeling diode D1, and a second freewheeling diode D2. The positive electrode Vin of the input voltage source is connected to one end of the first switch tube S1, one end of the second switch tube S2 and one end of the input energy storage capacitor C; the other end of the first switch tube S1 is connected to one end of the first energy storage inductor L1 and the negative electrode of the first freewheeling diode D1, and the other end of the second switch tube S2 is connected to one end of the second energy storage inductor L2 and the negative electrode of the second freewheeling diode D2; the other end of the first energy storage inductor L1 and the other end of the second energy storage inductor L2 are connected to one end of the laser pumping resistor R; the negative electrode of the input voltage source Vin is connected to the other end of the input energy storage capacitor C, the positive electrode of the first freewheeling diode D1, the positive electrode of the second freewheeling diode D2 and the other end of the laser pumping resistor R.

[0034] The energy feedback circuit 20 includes a direct rectification energy control diode Drec, a single-channel relay energy switch tube Srec and a synchronous capture switch tube Ssh connected in sequence. The positive electrode of the direct rectification energy control diode Drec is connected to one end of the single-channel relay energy switch tube Srec, and the other end of the single-channel relay energy switch tube Srec is connected to the synchronous capture switch tube Ssh.

[0035] Among them, one end of the direct rectification energy control diode Drec is connected to the positive electrode of the input voltage source Vin, one end of the first switch tube S1, one end of the second switch tube S2 and one end of the input energy storage capacitor C, the other end of the direct rectification energy control diode Drec is connected to the other end of the first energy storage inductor L1, the other end of the second energy storage inductor L2 and one end of the single-way relay energy switch tube Srec, the other end of the single-way relay energy switch tube Srec is connected to one end of the synchronous capture switch tube Ssh and one end of the laser pumping resistor R; the other end of the synchronous capture switch tube Ssh is connected to the negative electrode of the input voltage source Vin, the other end of the input energy storage capacitor C, the positive electrode of the first freewheeling diode D1, the positive electrode of the second freewheeling diode D2 and the other end of the laser pumping resistor R.

[0036] The high-power high-repetition-rate pulse constant current discharge circuit further includes a protection circuit 40 , which samples the current (ie, the total output current) flowing through the laser pump resistor R to protect the two-phase interleaved parallel Buck circuit 10 through the controller 30 .

[0037] Please refer to Figure 5 , which shows a schematic diagram of the operating principle of a high-power high-repetition-rate pulse constant current discharge circuit provided by an embodiment of the present application. The operating principle of the high-power high-repetition-rate pulse constant current discharge circuit is as follows: During the charging stage, the controller 30 controls the single-channel relay energy switch tube Srec and the synchronous capture switch tube to close Ssh, and triggers the first switch tube S1 and the second switch tube S2 through an interlaced pulse width modulation signal with a fixed duty cycle, so that the first energy storage inductor L1 and the second energy storage inductor L2 are pre-charged to the desired current value.

[0038] The fixed duty cycle is determined according to the input voltage source, the first energy storage inductor, the second energy storage inductor, the preset output pulse discharge current and the time of the charging stage. Determined according to the following formula:

[0039] in, is the input voltage source, that is, the charging voltage from the front-stage charging network of the constant current pulse power supply to the back-stage pulse discharge network. is the inductance value of the first energy storage inductor and the second energy storage inductor, is the preset output pulse discharge current, It is the time of the charging stage. It should be noted that the time of the charging stage is related to the current sampling time of the energy storage inductor and can only be an integer multiple of the current sampling time of the energy storage inductor. For example, the current sampling time of the energy storage inductor can be 50 .

[0040] After the pre-charge is completed, the delay time after the pulse ends can be calculated based on the pulse repetition period, the time of the charging phase and the time of the discharging phase (i.e. the pulse width). , that is, the time of the energy feedback phase. Specifically, the time of the energy feedback phase is calculated according to the following formula:

[0041] in, is the time of the discharge phase, is the pulse repetition period.

[0042] Further, It can be calculated based on the single pulse energy, energy storage inductance and preset output pulse discharge current. Specifically, It can be calculated according to the following formula:

[0043] During the discharge stage, the controller 30 controls the single-channel relay energy switch tube Srec to close, the synchronous capture switch tube Ssh to turn off, and triggers the first switch tube S1 and the second switch tube S2 through the staggered pulse width modulation signal of the duty cycle output by the proportional integral controller, so that the first energy storage inductor L1 and the second energy storage inductor L2 perform pulse constant current discharge.

[0044] In the energy feedback stage, the controller 30 controls the single-channel relay energy switch tube Srec to be turned off, the synchronous capture switch tube Ssh to be closed, and the first switch tube S1 and the second switch tube S2 to be turned off, so that the remaining energy after the first energy storage inductor L1 and the second energy storage inductor L2 are subjected to pulse constant current discharge is fed back to the input voltage source Vin through the energy feedback circuit 20.

[0045] Furthermore, we can also , L, duty cycle D, and The switching frequency Calculate the total output current ripple of the pulse discharge network as follows:

[0046] Please refer to Figure 6 , which shows a schematic diagram of the total output current waveform provided by an embodiment of the present application. It can be seen that the initial current value of the output current is smaller than the expected output current value. This is because the pre-charge fixed duty cycle calculation is performed under ideal conditions, ignoring the parasitic resistance of the inductor, etc., so that the energy storage inductor fails to charge to the expected current value during the pre-charge stage.

[0047] In order to verify the feasibility of the technical solution of this application, a simulation circuit of the new high-power high-repetition-rate constant-current pulse discharge network was built. The main circuit parameters and experimental conditions are as follows: Set the maximum charging voltage of the pulse power supply is 200V, the input capacitance C is 300μF, and the pulse discharge current The load characteristics of semiconductor lasers are similar to those of diodes, so this application uses multiple diode loads in series to act as a load resistance R of 0.27Ω. This technical solution has high feasibility. The actual charging time of the designed pulse power supply is 150μs, the discharge duration (pulse width) is 1ms, the pulse repetition frequency is 500Hz, and the discharge end delay time is 1ms.

[0048] Calculate:

[0049]

[0050] It can be seen that the high-power, high-repetition-frequency pulse constant current discharge circuit disclosed in the present application can not only realize the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recovery of the residual energy of the energy storage inductor after discharge, thereby reducing energy waste, but also realize the controllable pulse width and pulse frequency according to the output average power requirement of the high-power, high-repetition-frequency pulse constant current discharge circuit, and discharge the pulse load through the switch action after the pre-charging of the energy storage inductor, thereby realizing that the pulse current has a steeper rising edge, and after the discharge is completed, the load is separated from the pulse discharge network through the switch, thereby realizing that the pulse current has a steeper falling edge.

[0051] The embodiments of the present application also provide a pulse laser power supply for powering a laser pump, wherein the pulse laser power supply includes the high-power and high-repetition-rate pulse constant-current discharge circuit described in any of the above embodiments.

[0052] It should be understood that the specific examples in this application are only intended to help those skilled in the art to better understand the embodiments of the present application, rather than to limit the scope of the present invention.

[0053] It can be understood that in the various implementations of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation methods of the present application.

[0054] It can be understood that the various embodiments described in this application can be implemented individually or in combination, and the embodiments of this application are not limited to this.

[0055] Unless otherwise stated, all technical and scientific terms used in the embodiments of the present application have the same meaning as those generally understood by those skilled in the art of the technical field of the present application. The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the scope of the present application. The term "and / or" used in the present application includes any and all combinations of one or more related listed items. The singular forms of "a kind of", "above" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0056] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0057] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0058] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0059] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0060] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0061] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0062] The above are only specific embodiments of the present application, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A high-power high-repetition-rate pulse constant current discharge circuit, characterized in that: The high-power high-repetition-rate pulse constant-current discharge circuit includes a multi-phase interleaved parallel Buck circuit, an energy feedback circuit and a controller. The controller samples the current in the multi-phase interleaved parallel Buck circuit to perform timing triggering control on the switching tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, thereby realizing the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recovery of the residual energy of the energy storage inductor after discharge.

2. The high-power high-repetition-rate pulse constant current discharge circuit according to claim 1 is characterized in that: The multi-phase interleaved parallel Buck circuit is a two-phase interleaved parallel Buck circuit, which includes an input voltage source, a laser pumping resistor, a first energy storage inductor, a second energy storage inductor, an input energy storage capacitor, a first switch tube, a second switch tube, a first freewheeling diode, and a second freewheeling diode; the positive electrode of the input voltage source is connected to one end of the first switch tube, one end of the second switch tube, and one end of the input energy storage capacitor; the other end of the first switch tube is connected to one end of the first energy storage inductor and the negative electrode of the first freewheeling diode, and the other end of the second switch tube is connected to one end of the second energy storage inductor and the negative electrode of the second freewheeling diode; the other end of the first energy storage inductor and the other end of the second energy storage inductor are connected to one end of the laser pumping resistor; the negative electrode of the input voltage source is connected to the other end of the input energy storage capacitor, the positive electrode of the first freewheeling diode, the positive electrode of the second freewheeling diode, and the other end of the laser pumping resistor.

3. The high-power high-repetition-rate pulse constant current discharge circuit according to claim 2 is characterized in that: The energy feedback circuit includes a direct rectification energy control diode, a single-channel relay energy switch tube and a synchronous capture switch tube which are connected in sequence.

4. The high-power high-repetition-rate pulse constant current discharge circuit according to claim 3 is characterized in that: One end of the direct rectification energy control diode is connected to the positive electrode of the input voltage source, one end of the first switch tube, one end of the second switch tube and one end of the input energy storage capacitor; the other end of the direct rectification energy control diode is connected to the other end of the first energy storage inductor, the other end of the second energy storage inductor and one end of the single-way relay energy switch tube; the other end of the single-way relay energy switch tube is connected to one end of the synchronous capture switch tube and one end of the laser pump resistor; the other end of the synchronous capture switch tube is connected to the negative electrode of the input voltage source, the other end of the input energy storage capacitor, the positive electrode of the first freewheeling diode, the positive electrode of the second freewheeling diode and the other end of the laser pump resistor.

5. The high-power high-repetition-rate pulse constant current discharge circuit according to claim 2 is characterized in that: The high-power high-repetition-rate pulse constant-current discharge circuit also includes a protection circuit, which samples the current flowing through the laser pump resistor to protect the two-phase staggered parallel Buck circuit through the controller.

6. The high-power high-repetition-rate pulse constant-current discharge circuit according to claim 5 is characterized in that: The controller controls the single-channel relay energy switch tube and the synchronous capture switch tube to close during the charging stage, and triggers and controls the first switch tube and the second switch tube through an interleaved pulse width modulation signal with a fixed duty cycle, so that the first energy storage inductor and the second energy storage inductor are pre-charged to a desired current value.

7. The high-power high-repetition-rate pulse constant-current discharge circuit according to claim 6 is characterized in that: The fixed duty cycle is determined according to the input voltage source, the first energy storage inductor, the second energy storage inductor, a preset output pulse discharge current and the time of the charging stage.

8. The high-power high-repetition-rate pulse constant-current discharge circuit according to claim 5 is characterized in that: During the discharge phase, the controller controls the single-channel relay energy switch tube to close and the synchronous capture switch tube to turn off, and triggers and controls the first switch tube and the second switch tube through the staggered pulse width modulation signal of the duty cycle output by the proportional integral controller, so that the first energy storage inductor and the second energy storage inductor perform pulse constant current discharge.

9. The high-power high-repetition-rate pulse constant-current discharge circuit according to claim 5, characterized in that: During the energy feedback stage, the controller controls the single-channel relay energy switch tube to turn off, the synchronous capture switch tube to close, and the first switch tube and the second switch tube to turn off, so that the residual energy after the first energy storage inductor and the second energy storage inductor perform pulse constant current discharge is fed back to the input voltage source through the energy feedback circuit. The time of the energy feedback stage is determined according to the pulse repetition period, the time of the charging stage and the time of the discharging stage.

10. A pulsed laser power supply for laser pump power supply, characterized in that: The pulse laser power supply includes a high-power, high-repetition-rate pulse constant-current discharge circuit as described in any one of claims 1-9.

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