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

Abstract

The embodiment of the application discloses a high-power high-repetition-frequency pulse constant-current discharge circuit and a pulse laser power supply. The high-power high-repetition-frequency pulse constant-current discharge circuit comprises 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 time sequence trigger control on the switching tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, realizes 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 discharging, and reduces the waste of energy.

Description

TECHNICAL FIELD

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

[0002] With the wide application of lasers in the fields of industry, agriculture, medicine, military and the like, high-power constant-current pulse power supply as a laser driving power supply has also been widely researched. Among them, the selection of a suitable topology for the pulse discharge network is important for improving the discharge quality of the pulse power supply. However, the current pulse discharge network has the problems of overcharge of the initial discharge current and waste of residual energy of the energy storage inductor after the pulse ends. SUMMARY

[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 recycle the residual energy of the energy storage inductor after the pulse ends through an energy feedback circuit, thereby reducing the waste of energy.

[0004] The first aspect of the embodiment of the present application provides a high-power high-repetition-rate pulse constant-current discharge circuit, which comprises 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 time sequence trigger control on the switching tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, so as to realize the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recycling of the residual energy of the energy storage inductor after the discharging.

[0005] For example, the multi-phase interleaved parallel Buck circuit is a two-phase interleaved parallel Buck circuit, which comprises 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 switching tube, a second switching tube, a first freewheeling diode and a second freewheeling diode. The positive electrode of the input voltage source is connected with one end of the first switching tube, one end of the second switching tube and one end of the input energy storage capacitor. The other end of the first switching tube is connected with one end of the first energy storage inductor and the negative electrode of the first freewheeling diode, and the other end of the second switching tube is connected with 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 with one end of the laser pumping resistor. The negative electrode of the input voltage source is connected with 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] For example, the energy feedback circuit includes a direct rectifier energy control diode, a single-channel relay energy switch, and a synchronous capture switch connected in sequence.

[0007] For example, one end of the direct rectifier energy control diode is connected to the positive terminal of the input voltage source, one end of the first switching transistor, one end of the second switching transistor, and one end of the input energy storage capacitor; the other end of the direct rectifier 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-channel relay energy switch; the other end of the single-channel relay energy switch is connected to one end of the synchronization capture switch and one end of the laser pump resistor; the other end of the synchronization capture switch is connected to the negative terminal of the input voltage source, the other end of the input energy storage capacitor, the positive terminal of the first freewheeling diode, the positive terminal of the second freewheeling diode, and the other end of the laser pump resistor.

[0008] For example, 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] For example, during the charging phase, the controller controls the closing of the single-channel relay energy switch and the synchronous capture switch, and triggers the control of the first switch and the second switch 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 precharged to the desired current value.

[0010] For example, the fixed duty cycle is determined based on the input voltage source, the first energy storage inductor, the second energy storage inductor, the preset output pulse discharge current, and the duration of the charging phase.

[0011] For example, during the discharge phase, the controller controls the single-channel relay energy switch to close and the synchronous capture switch to turn off, and triggers the control of the first switch and the second switch through the alternating 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.

[0012] Exemplarily, the controller controls the single-way relay energy switch tube to be turned off, the synchronous capture switch tube to be closed, and the first switch tube and the second switch tube to be both turned off in the energy feedback stage, so that the remaining energy of the first energy storage inductor and the second energy storage inductor after 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] The second aspect of the embodiment of the present application provides a pulse laser power supply for supplying power to a laser, and the pulse laser power supply comprises the high-power 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 comprises 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 control the timing triggering of the switch tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, so that the charging and discharging of the energy storage inductor in the multi-phase interleaved parallel Buck circuit and the recovery of the remaining energy of the energy storage inductor after discharging can be realized, and the waste of energy can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 A structural block diagram of the high-power high-repetition-rate pulse constant current discharge circuit provided by an embodiment of the present application is shown;

[0017] Figure 2 A structural block diagram of the two-phase interleaved parallel Buck circuit provided by an embodiment of the present application is shown;

[0018] Figure 3 A structural block diagram of the energy feedback circuit provided by an embodiment of the present application is shown;

[0019] Figure 4 A structural block diagram of the high-power high-repetition-rate pulse constant current discharge circuit provided by another embodiment of the present application is shown;

[0020] Figure 5 A schematic diagram of the operation principle of the high-power high-repetition-rate pulse constant current discharge circuit provided by an embodiment of the present application is shown;

[0021] Figure 6 A schematic diagram of a total output current waveform provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0023] Reference is made 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 can include a multi-phase interleaved parallel Buck circuit 10, an energy feedback circuit 20, and a controller 30.

[0024] The multi-phase interleaved parallel Buck circuit 10 is connected with the energy feedback circuit 20, and the controller 30 can sample the current in the multi-phase interleaved parallel Buck circuit 10, which refers to the current flowing through each Buck circuit and the current flowing through the energy storage inductor in each Buck circuit. By sampling the current, the switching tubes in the multi-phase interleaved parallel Buck circuit 10 and the energy feedback circuit 20 are controlled in time sequence to realize the charging and discharging of the energy storage inductor. When the energy storage inductor is charged, overcharging may occur, which causes the stored energy not to be completely released when the energy storage inductor is discharged. Therefore, after the pulse ends, the closing and opening of the switching tubes in the multi-phase interleaved parallel Buck circuit 10 and the energy feedback circuit 20 can be controlled to make the residual energy of the energy storage inductor feedback to the input side through the energy feedback circuit 20, realizing the recovery of energy.

[0025] The multi-phase interleaved parallel Buck circuit is to connect the output voltages of multiple Buck circuits in parallel, and the output currents of the Buck circuits are interleaved by controlling the phase difference of each Buck circuit. The basic principle is that only one Buck circuit is in the on state and the other circuits are in the off state at each time, thereby realizing 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.

[0026] The energy feedback circuit is a circuit for returning the excess energy in the system to the power supply or storage device.

[0027] The controller can include one or more of a microprocessor, a digital signal processor, a programmable logic controller, etc., and the control strategy of the controller can be one or more of proportional integral control, sliding mode control, fuzzy control, adaptive control.

[0028] It can be seen that the high-power high-repetition-rate pulse constant-current discharge circuit disclosed in the application comprises 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 trigger control on the switching tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, so that the charging and discharging of the energy storage inductors in the multi-phase interleaved parallel Buck circuit and the recovery of the residual energy of the energy storage inductors after discharging can be realized, thereby reducing the waste of energy.

[0029] In a specific embodiment of the application, the multi-phase interleaved parallel Buck circuit is a two-phase interleaved parallel Buck circuit. Please refer to Figure 2 which shows the structure block diagram of the two-phase interleaved parallel Buck circuit provided by an embodiment of the application. The two-phase interleaved parallel Buck circuit 10 comprises an input voltage source Vin, a laser pumping resistor R, a first energy storage inductor L1, a second energy storage inductor L2, an input energy storage capacitor C, a first switching tube S1, a second switching tube S2, a first freewheeling diode D1 and a second freewheeling diode D2.

[0030] The positive electrode of the input voltage source Vin is connected to one end of the first switching tube S1, one end of the second switching tube S2 and one end of the input energy storage capacitor C; the other end of the first switching 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 switching 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.

[0031] The switching tube is an electronic element mainly used for controlling the current flow or off in the circuit. The switching tube in the 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.

[0032] Please refer to Figure 3Figure 1 shows a structural block diagram of an energy feedback circuit according to an embodiment of the present application. The energy feedback circuit 20 comprises a direct rectifier energy control diode Drec, a single relay energy switch Srec and a synchronous sampling switch Ssh connected in sequence.

[0033] The positive electrode of the direct rectifier energy control diode Drec is connected to one end of the single relay energy switch Srec, and the other end of the single relay energy switch Srec is connected to the synchronous sampling switch Ssh.

[0034] 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 controls the energy flow of the rectifier directly to achieve precise management and optimization of the power system. The rectifier is usually composed of multiple switch tubes (such as MOSFET or IGBT), which realize DC output through specific control strategies. In an embodiment provided by the present application, it is composed of diodes.

[0035] Single relay energy control (Srec) is a device used for energy control in power systems, mainly through a relay to realize the switching control of the circuit. The relay is an electrically controlled switch that controls the closing and opening of the contact through the energization and de-energization of the coil.

[0036] Synchronous sampling switch (Ssh) is an electronic switching technology used for high-precision sampling and signal processing. It has a wide range of applications in many high-performance electronic systems, especially in situations that require precise control and high-speed sampling. Ssh technology controls the conduction and turn-off of the switch tube to ensure the accuracy and reliability of the sampling signal. Ssh usually uses high-speed switch tubes such as MOSFET or JFET, which have low conduction resistance and fast switching speed. The conduction and turn-off of the switch tube is driven by a control signal (usually a clock signal).

[0037] Please refer to Figure 4 Figure 2 shows a structural block diagram of a high-power high-repetition-rate pulse constant-current discharge circuit according to another embodiment of the present application. The high-power high-repetition-rate pulse constant-current discharge circuit can include a two-phase interleaved parallel Buck circuit 10, an energy feedback circuit 20 and a controller 30.

[0038] The two-phase interleaved parallel Buck circuit 10 comprises an input voltage source Vin, a laser pumping 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. A positive electrode of the input voltage source Vin 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. Another end of the first switch tube S1 is connected to one end of the first energy storage inductor L1 and a negative electrode of the first freewheeling diode D1. Another end of the second switch tube S2 is connected to one end of the second energy storage inductor L2 and a negative electrode of the second freewheeling diode D2. Another end of the first energy storage inductor L1 and another end of the second energy storage inductor L2 are connected to one end of the laser pumping resistor R. A negative electrode of the input voltage source Vin is connected to another end of the input energy storage capacitor C, a positive electrode of the first freewheeling diode D1, a positive electrode of the second freewheeling diode D2, and another end of the laser pumping resistor R.

[0039] The energy feedback circuit 20 comprises a direct rectification energy control diode Drec, a single-relay energy switch tube Srec, and a synchronous capture switch tube Ssh connected in sequence. A positive electrode of the direct rectification energy control diode Drec is connected to one end of the single-relay energy switch tube Srec. Another end of the single-relay energy switch tube Srec is connected to the synchronous capture switch tube Ssh.

[0040] A positive electrode of the direct rectification energy control diode Drec is connected to a 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. Another end of the direct rectification energy control diode Drec is connected to another end of the first energy storage inductor L1, another end of the second energy storage inductor L2, and one end of the single-relay energy switch tube Srec. Another end of the single-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. Another end of the synchronous capture switch tube Ssh is connected to a negative electrode of the input voltage source Vin, another end of the input energy storage capacitor C, a positive electrode of the first freewheeling diode D1, a positive electrode of the second freewheeling diode D2, and another end of the laser pumping resistor R.

[0041] The high-power high-repetition-rate pulse constant-current discharge circuit further comprises a protection circuit 40. The protection circuit 40 samples a current (i.e., an output total current) flowing through the laser pumping resistor R to protect the two-phase interleaved parallel Buck circuit 10 through the controller 30.

[0042] Please refer to Figure 5 , which shows a schematic diagram of the operation principle of the high-power high-repetition-rate pulse constant-current discharge circuit provided by an embodiment of the present application. The operation principle of the high-power high-repetition-rate pulse constant-current discharge circuit is as follows:

[0043] In the charging phase, the controller 30 controls the single-channel relay energy switch tube Srec and the synchronous capture switch tube Ssh to be closed, and triggers and controls the first switch tube S1 and the second switch tube S2 through a fixed-duty-ratio interleaved pulse width modulation signal, so that the first energy storage inductor L1 and the second energy storage inductor L2 are pre-charged to a desired current value.

[0044] The fixed duty ratio 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 phase. Specifically, the fixed duty ratio is determined according to the following formula:

[0045]

[0046] wherein, is the input voltage source, that is, the charging voltage of the pre-stage charging network of the constant-current pulse power supply to the post-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, is the time of the charging phase. It should be noted that the time of the charging phase 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 .

[0047] After the pre-charging ends, the delay time after the end of the pulse , that is, the time of the energy feedback phase, can be calculated according to the pulse repetition period, the time of the charging phase, and the time of the discharge phase (that is, the pulse width). Specifically, the time of the energy feedback phase is calculated according to the following formula:

[0048]

[0049] wherein, is the time of the discharge phase, is the pulse repetition period.

[0050] Further, the single-pulse energy, the energy storage inductor, and the preset output pulse discharge current can be calculated, specifically, the single-pulse energy can be calculated according to the following formula:

[0051]

[0052] During the discharge phase, the controller 30 controls the single-channel relay energy switch Snec to close, the synchronous capture switch Ssh to turn off, and triggers the first switch S1 and the second switch S2 through the duty cycle interleaved pulse width modulation signal 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.

[0053] During the energy feedback phase, the controller 30 controls the single-channel relay energy switch Serec to turn off, the synchronous capture switch Ssh to close, and the first switch S1 and the second switch S2 to turn off, so that the remaining energy after the first energy storage inductor L1 and the second energy storage inductor L2 undergo pulse constant current discharge is fed back to the input voltage source Vin through the energy feedback circuit 20.

[0054] Furthermore, it can also be based on L, duty cycle D, and Switching frequency The total output current ripple of the pulse discharge network is calculated as follows:

[0055]

[0056] Please refer to Figure 6 The diagram illustrates a total output current waveform provided in one embodiment of this application. It can be seen that the initial output current value is smaller than the expected output current value. This is because the pre-charge fixed duty cycle calculation is performed under ideal conditions, ignoring parasitic resistance of the inductor, etc., which causes the energy storage inductor to fail to charge to the expected current value during the pre-charge stage.

[0057] To verify the feasibility of the technical solution proposed in this application, a simulation circuit of the novel high-power, high-repetition-rate constant-current pulse discharge network was constructed. The main circuit parameters and experimental conditions are as follows: the maximum charging voltage of the pulse power supply is set. The voltage is 200V, the input capacitor C is 300μF, and the pulse discharge current is... The current rating is 100A, and the value of a single energy storage inductor L is 150μH. Since the load characteristics of a semiconductor laser are similar to those of a diode, this application uses multiple diode loads connected in series to serve as the load, with a resistance R of 0.27Ω. This technical solution is highly feasible. The actual charging time of the pulse power supply is designed to be 150μs, the discharge duration (pulse width) is 1ms, the pulse repetition frequency is 500Hz, and the discharge end delay time is 1ms.

[0058] Calculated:

[0059]

[0060]

[0061] It can be seen that the high-power high-repetition pulse constant current discharge circuit disclosed in the 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 discharging, but also can realize the controllability of the pulse width and the pulse frequency according to the requirement of the average output power of the high-power high-repetition pulse constant current discharge circuit. In addition, the high-power high-repetition pulse constant current discharge circuit can realize the steep rising edge of the pulse current by pre-charging the energy storage inductor and discharging the pulse load through the switching action after the pre-charging is completed. Furthermore, the high-power high-repetition pulse constant current discharge circuit can realize the steep falling edge of the pulse current by disconnecting the load from the pulse discharge network through the switching after the discharging is completed.

[0062] The embodiment of the application also provides a pulse laser power supply for supplying power to a laser, which comprises the high-power high-repetition pulse constant current discharge circuit in any of the above-mentioned embodiments.

[0063] It can be understood that the specific examples in the application are only for helping those skilled in the art to better understand the embodiments of the application, and do not limit the scope of the application.

[0064] It can be understood that in various embodiments in the application, the size of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the application.

[0065] It can be understood that the various embodiments described in the application can be implemented alone or in combination, and the embodiments of the application do not limit this.

[0066] Unless otherwise specified, all technical and scientific terms used in the embodiments of the application have the same meanings as those commonly understood by those skilled in the art of the technology of the application. The terms used in the application are only for the purpose of describing the specific embodiments of the application, and are not intended to limit the scope of the application. The term "and / or" used in the application includes any and all combinations of one or more related listed terms. The singular forms "a", "an" and "the" used in the embodiments of the application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0067] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0068] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0069] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are merely schematic, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0070] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

[0071] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit.

[0072] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0073] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-power high-repetition-rate pulsed constant-current discharge circuit, characterized by comprising: The high-power high-repetition-rate pulse constant-current discharge circuit comprises a multi-phase interleaved parallel Buck circuit, an energy feedback circuit and a controller, the controller samples currents in the multi-phase interleaved parallel Buck circuit to perform time sequence trigger control on switch tubes in the multi-phase interleaved parallel Buck circuit and the energy feedback circuit, so as to realize charging and discharging of energy storage inductors in the multi-phase interleaved parallel Buck circuit and recovery of residual energy of the energy storage inductors after discharging; The multi-phase interleaved parallel Buck circuit is a two-phase interleaved parallel Buck circuit, which comprises 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; a positive electrode of the input voltage source is connected with 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 with one end of the first energy storage inductor and a negative electrode of the first freewheeling diode, and the other end of the second switch tube is connected with one end of the second energy storage inductor and a 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 with one end of the laser pumping resistor; a negative electrode of the input voltage source is connected with the other end of the input energy storage capacitor, a positive electrode of the first freewheeling diode, a positive electrode of the second freewheeling diode and the other end of the laser pumping resistor; The energy feedback circuit comprises a direct rectification energy control diode, a single-channel relay energy switch tube and a synchronous capture switch tube connected in sequence; One end of the direct rectification energy control diode is connected with 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 with the other end of the first energy storage inductor, the other end of the second energy storage inductor and one end of the single-channel relay energy switch tube, the other end of the single-channel relay energy switch tube is connected with one end of the synchronous capture switch tube and one end of the laser pumping resistor; the other end of the synchronous capture switch tube is connected with 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 pumping resistor; The controller controls the single-channel relay energy switch tube to be turned off, the synchronous capture switch tube to be closed and the first switch tube and the second switch tube to be both turned off in an energy feedback stage, so that residual energy of the first energy storage inductor and the second energy storage inductor after 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 a pulse repetition period, a charging stage time and a discharging stage time.

2. The high-power high-repetition-rate pulsed constant-current discharge circuit according to claim 1, characterized in that, The high-power high-repetition-rate pulse constant-current discharge circuit further comprises a protection circuit, which samples the current flowing through the laser pumping resistor to protect the two-phase interleaved parallel Buck circuit through the controller.

3. The high-power high-repetition-rate pulsed constant-current discharge circuit according to claim 2, characterized in that, The controller controls the single-relay energy switch tube and the synchronous capture switch tube to be closed in the charging stage, and triggers and controls the first switch tube and the second switch tube through the fixed-duty-ratio interleaved pulse width modulation signal, so that the first energy storage inductor and the second energy storage inductor are pre-charged to a desired current value.

4. The high-power high-repetition-rate pulsed constant-current discharge circuit according to claim 3, characterized in that, The fixed duty ratio 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 a time of the charging stage.

5. The high-power high-repetition rate pulsed constant current discharge circuit according to claim 4, characterized in that, The controller controls the single-relay energy switch tube to be closed, the synchronous capture switch tube to be turned off in the discharge stage, and triggers and controls the first switch tube and the second switch tube through the duty-ratio interleaved pulse width modulation signal output by a proportional-integral controller, so that the first energy storage inductor and the second energy storage inductor perform pulse constant-current discharge.

6. The high-power high-repetition-rate pulse constant-current discharge circuit according to claim 5, wherein The controller controls the single-relay energy switch tube to be turned off, the synchronous capture switch tube to be closed, and the first switch tube and the second switch tube to be turned off in the energy feedback stage, so that the remaining energy of the first energy storage inductor and the second energy storage inductor after pulse constant-current discharge is fed back to the input voltage source through the energy feedback circuit, and a time of the energy feedback stage is determined according to a pulse repetition period, a time of the charging stage and a time of the discharge stage.

7. A pulsed laser power supply for powering a laser, characterized by, The pulse laser power supply comprises the high-power high-repetition-rate pulse constant-current discharge circuit according to any one of claims 1-6.

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