High-power laser pulse current source circuit, current source and control method

Abstract

The embodiment of the present application discloses a modular high-power laser pulse current source circuit, a current source and its control method. The high-power laser pulse current source circuit includes a main circuit and a control circuit. The main circuit includes a cascaded pre-stage charging circuit and a pulse forming circuit. The control circuit includes a total control unit, a pre-stage charging control unit and a post-stage pulse forming control unit cascaded in sequence. When receiving a start signal sent by the total control unit or detecting that the voltage of the post-stage energy storage capacitor is lower than the minimum set voltage threshold, during the pulse current interval time, the post-stage energy storage capacitor is charged through the pre-stage charging circuit. Then, the total control unit sends a current pulse forming signal to the post-stage pulse forming control unit. The post-stage pulse forming control unit discharges the post-stage energy storage capacitor to control the pulse forming circuit to output the pulse current required for pumping the semiconductor laser. By adopting the present application, high-power pulse current can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic circuits, and in particular to a high-power laser pulse current source circuit, a current source, and a control method. Background Art

[0002] With the development of technology, lasers are increasingly widely used in various fields, such as ranging, guidance, radar, or communication. To improve the convenience of use, the pulse drive power supply of airborne lasers needs to be small in size, light in weight, and high in efficiency. According to the power requirements of semiconductor lasers, a high-quality pulsed current waveform has high requirements for the rise and fall times in terms of dynamics. At the same time, in terms of stability, it is required that the current ripple, overshoot, reverse current, etc. all meet higher standards.

[0003] In response to the above requirements, the Shanghai Institute of Space Power Sources applied for a patent named "A High-Power Pulse Laser Power Supply Circuit" with a publication number of "CN112909722A" on February 19, 2021. This patent proposed a brand-new design architecture, adopting a topology of interleaved parallel BOOST + hysteresis BUCK + linear constant current source parallel output to improve the instantaneous power of the pulsed laser power supply, and the design structure is simple. However, this circuit does not consider the coordinated control of the front and rear stages, which may cause the energy storage capacitor to not meet the output requirements of the rear stage. Summary of the Invention

[0004] The embodiments of the present application provide a high-power laser pulse current source circuit, a current source, and a control method, which can achieve the coordinated control of the front-stage charging circuit and the pulse formation circuit, so that the rear-stage energy storage capacitor can be maintained within a certain voltage range, meet the power output requirements, and create a good environment for the rear-stage output.

[0005] In the first aspect of the embodiments of the present application, a high-power laser pulse current source circuit is provided. The high-power laser pulse current source circuit includes a main circuit and a control circuit. The main circuit includes a cascaded front-stage charging circuit and a pulse formation circuit. The control circuit includes a total control unit, a front-stage charging control unit, and a rear-stage pulse formation control unit cascaded in sequence;

[0006] After receiving the start signal sent by the total control unit or detecting that the voltage of the rear-stage energy storage capacitor in the pulse formation circuit is lower than the minimum set voltage threshold, the front-stage charging control unit charges the rear-stage energy storage capacitor through the front-stage charging circuit during the pulse current interval time; the rear-stage pulse formation control unit is used to discharge the rear-stage energy storage capacitor after receiving the current pulse signal sent by the total control unit, so as to control the pulse formation circuit to output the pulse current required for pumping the semiconductor laser.

[0007] Optionally, the pulse forming circuit includes a plurality of circuit modules connected in parallel, and each circuit module includes two interleaved and parallel BUCK circuits.

[0008] Optionally, the two interleaved and parallel BUCK circuits include two first diodes, two first field effect transistors, and two energy storage inductors; the anodes of the two first diodes are connected, the sources of the two first field effect transistors are connected, the cathode of one of the first diodes is connected to one end of one of the energy storage inductors and the drain of one of the first field effect transistors, the cathode of the other first diode is connected to one end of the other energy storage inductor and the drain of the other first field effect transistor, and the other ends of the two energy storage inductors are connected.

[0009] Optionally, the circuit module further includes two insulated gate bipolar transistors and two second diodes, the source of one of the insulated gate bipolar transistors is connected to the first end of the two interleaved and parallel BUCK circuits and the anode of one of the second diodes, the drain of one of the insulated gate bipolar transistors is connected to the second end of the two interleaved and parallel BUCK circuits, the anode of the other diode, and the drain of the other insulated gate bipolar transistor, the source of the other insulated gate bipolar transistor is connected to the cathode of one of the second diodes, and the cathode of the other second diode is connected to the third end of the two interleaved and parallel BUCK circuits.

[0010] Optionally, the circuit module further includes the post-stage energy storage capacitor, one end of the post-stage energy storage capacitor is connected to the first end of the two interleaved and parallel BUCK circuits, and the other end of the post-stage energy storage capacitor is connected to the third end of the two interleaved and parallel BUCK circuits.

[0011] Optionally, the pre-stage charging circuit includes a rectifying circuit, the rectifying circuit includes a plurality of third diodes and a bus capacitor, the plurality of third diodes are connected in parallel with the bus capacitor, and among them, the plurality of third diodes are connected in series in pairs and then in parallel.

[0012] Optionally, the pre-stage charging circuit further includes a phase-shifted full-bridge DC conversion circuit connected to the rectifying circuit, the phase-shifted full-bridge DC conversion circuit includes a first H-bridge circuit, a first inductor, a transformer, a second H-bridge circuit, and a second inductor cascaded in sequence; among them, the first H-bridge circuit includes four second field effect transistors, and the second H-bridge circuit includes four fourth diodes.

[0013] In the second aspect of the embodiments of the present application, a current source is provided, and the current source includes the high-power laser pulse current source circuit as described in any one of the first aspects above.

[0014] In the third aspect of the embodiments of the present application, a control method for a high-power laser pulse current source circuit is provided. The high-power laser pulse current source circuit includes a main circuit and a control circuit. The main circuit includes a cascaded pre-stage charging circuit and a pulse forming circuit. The control circuit includes a total control unit, a pre-stage charging control unit, and a post-stage pulse forming control unit that are cascaded in sequence. The method includes:

[0015] The total control unit sends a start signal to the pre-stage charging control unit;

[0016] After receiving the start signal, the pre-stage charging control unit charges the post-stage energy storage capacitor in the pulse forming circuit through the pre-stage charging circuit;

[0017] The total control unit sends a current pulse forming signal to the post-stage pulse forming control unit;

[0018] The post-stage pulse forming control unit is configured to, after receiving the current pulse forming signal sent by the total control unit, discharge the post-stage energy storage capacitor to control the pulse forming circuit to output the pulse current required for pumping the semiconductor laser.

[0019] Optionally, the method further includes:

[0020] During the pulse current interval, the voltage of the post-stage energy storage capacitor is detected by a voltage sensor;

[0021] If the voltage of the post-stage energy storage capacitor is lower than the minimum set voltage threshold, the pre-stage charging control unit charges the post-stage energy storage capacitor in the pulse forming circuit through the pre-stage charging circuit;

[0022] If the voltage of the post-stage energy storage capacitor is higher than the maximum set voltage threshold, the pre-stage charging control unit stops charging the post-stage energy storage capacitor in the pulse forming circuit through the pre-stage charging circuit.

[0023] It can be seen that a high-power laser pulse current source circuit disclosed in an embodiment of the present application includes a main circuit and a control circuit. The main circuit includes a cascaded pre-stage charging circuit and a pulse forming circuit, and the control circuit includes a total control unit, a pre-stage charging control unit, and a post-stage pulse forming control unit that are cascaded in sequence. After receiving the start signal sent by the total control unit, the post-stage energy storage capacitor in the pulse forming circuit is charged through the pre-stage charging circuit. Then, the total control unit sends a current pulse forming signal to the post-stage pulse forming control unit. The post-stage pulse forming control unit discharges the post-stage energy storage capacitor to control the pulse forming circuit to output the pulse current required for pumping the semiconductor laser. At the same time, during the pulse current interval, when it is detected that the voltage of the post-stage energy storage capacitor in the pulse forming circuit is lower than the minimum set voltage threshold, the post-stage energy storage capacitor is continuously charged. The coordinated control of the pre-stage charging circuit and the pulse forming circuit enables the post-stage energy storage capacitor to be maintained within a certain voltage range, meeting the power output requirements and creating a good environment for the post-stage output. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 FIG. shows a structural block diagram of a high-power laser pulse current source circuit provided by an embodiment of the present application;

[0026] Figure 2 FIG. shows a schematic structural diagram of a circuit module provided by an embodiment of the present application;

[0027] Figure 3 FIG. shows a schematic diagram of drive signals of each device in a circuit module provided by an embodiment of the present application;

[0028] Figure 4 FIG. shows a schematic structural diagram of a three-phase rectifier circuit provided by an embodiment of the present application;

[0029] Figure 5 FIG. shows a schematic structural diagram of a phase-shifted full-bridge DC conversion circuit provided by an embodiment of the present application;

[0030] Figure 6 FIG. shows a schematic structural diagram of the main circuit of a high-power laser pulse current source circuit provided by an embodiment of the present application;

[0031] Figure 7The flowchart shows a control method for a high-power laser pulse current source circuit provided by an embodiment of the present application;

[0032] Figure 8 The structural diagram shows a computer device provided by an embodiment of the present application. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0034] Please refer to Figure 1 , which shows a structural block diagram of a high-power laser pulse current source circuit provided by an embodiment of the present application. The high-power laser pulse current source circuit 10 includes a main circuit 100 and a control circuit 200. The main circuit 100 includes a cascaded pre-stage charging circuit 110 and a pulse forming circuit 120. The control circuit includes a total control unit 210, a pre-stage charging control unit 220, and a post-stage pulse forming control unit 230 that are cascaded in sequence.

[0035] After receiving the start signal sent by the total control unit 210 or detecting that the voltage of the post-stage energy storage capacitor in the pulse forming circuit 120 is lower than the minimum set voltage threshold, the pre-stage charging control unit 220 charges the post-stage energy storage capacitor through the pre-stage charging circuit 110 during the pulse current interval time; the post-stage pulse forming control unit 230 is used to discharge the post-stage energy storage capacitor after receiving the current pulse forming signal sent by the total control unit 210, so as to control the pulse forming circuit 120 to output the pulse current required for pumping the semiconductor laser.

[0036] Further, the pre-stage charging control unit 220 is also used to stop charging the post-stage energy storage capacitor through the pre-stage charging circuit 110 when detecting that the voltage of the post-stage energy storage capacitor is higher than the maximum set voltage threshold.

[0037] Among them, the minimum set voltage threshold and the maximum set voltage threshold are preset according to the rated voltage of the load, and are used to keep the voltage value of the post-stage energy storage capacitor within a certain range, that is, between the minimum set voltage threshold and the maximum set voltage threshold.

[0038] Among them, the start signal is used to start the pre-stage charging control unit 220 to charge the post-stage energy storage capacitor through the pre-stage charging circuit 110, so that the post-stage energy storage capacitor is charged to a preset voltage threshold, where the preset voltage threshold is greater than the minimum set voltage threshold and less than the maximum set voltage threshold. The formed current pulse signal is used to start the post-stage pulse formation control unit 230 to discharge the post-stage energy storage capacitor, so as to control the pulse formation circuit 120 to output the pulse current required for pumping the semiconductor laser. After that, the pre-stage charging control unit does not need to receive the signal from the total control unit 210 to start, and can monitor the voltage of the post-stage energy storage capacitor by itself through a voltage sensor. When the voltage is less than the minimum set voltage threshold, it charges the post-stage energy storage voltage during the pulse interval. When the voltage is greater than or equal to the maximum set voltage threshold, it stops charging the post-stage energy storage voltage. When the output pulse current exceeds the safety value or the load temperature exceeds the safety value, the circuit is cut off in time to protect the load.

[0039] Among them, the charging mode can be a constant current charging mode, and the control mode can be a hysteresis control mode, which is not limited here. The post-stage pulse formation control unit is mainly responsible for adjusting the current level, pulse width and frequency of the output pulse, so as to control the pulse formation circuit 120 to output the pulse current required for pumping the semiconductor laser.

[0040] Furthermore, the total control unit 210 also includes a protection unit inside. The protection unit has overcurrent and over-temperature protection functions, and will cut off the circuit in time when the output current is overcurrent and the load temperature is too high.

[0041] Furthermore, the post-stage pulse formation control unit 230 also has inductor current equalization control. By setting the same reference value for the currents of different branches, the current signals sampled by the current sensors are converted into voltage signals through sampling resistors. The voltage signals are compared with the reference values, and then passed through a PI regulator to output a suitable PWM wave in real time to control the switching tubes, so as to achieve precise control of the branch currents.

[0042] It can be seen that a high-power laser pulse current source circuit disclosed in an embodiment of the present application includes a main circuit and a control circuit. The main circuit includes a cascaded pre-stage charging circuit and a pulse forming circuit, and the control circuit includes a total control unit, a pre-stage charging control unit, and a post-stage pulse forming control unit that are cascaded in sequence. After receiving the start signal sent by the total control unit, the post-stage energy storage capacitor in the pulse forming circuit is charged through the pre-stage charging circuit. Then, the total control unit sends a current pulse forming signal to the post-stage pulse forming control unit. The post-stage pulse forming control unit discharges the post-stage energy storage capacitor to control the pulse forming circuit to output the pulse current required for pumping the semiconductor laser. At the same time, during the pulse current interval, when it is detected that the voltage of the post-stage energy storage capacitor in the pulse forming circuit is lower than the minimum set voltage threshold, the post-stage energy storage capacitor is continuously charged. The coordinated control of the pre-stage charging circuit and the pulse forming circuit enables the post-stage energy storage capacitor to be maintained within a certain voltage range, meeting the power output requirements and creating a good environment for the post-stage output.

[0043] In an embodiment of the present application, the pulse forming circuit includes a plurality of circuit modules connected in parallel. For the structural schematic diagram of the circuit module, see Figure 2 . As Figure 2 shown, each circuit module includes two interleaved and parallel BUCK circuits. The two interleaved and parallel BUCK circuits include two first diodes ( and ), two first field effect transistors ( and ), and two energy storage inductors ( and ); the anodes of the two first diodes ( and ) are connected, the sources of the two first field effect transistors ( and ) are connected. The cathode of one of the first diodes ( ) is connected to one end of one of the energy storage inductors ( ) and the drain of one of the first field effect transistors ( ). The cathode of the other first diode ( ) is connected to one end of the other energy storage inductor ( ) and the drain of the other first field effect transistor ( ). The other ends of the two energy storage inductors ( and ) are connected.

[0044] Furthermore, the circuit module further includes two insulated gate bipolar transistors ( and ) and two second diodes ( and ), where one insulated gate bipolar transistor 's source is connected to the first terminal a of two interleaved parallel BUCK circuits and the anode of one of the second diodes ; one insulated gate bipolar transistor 's drain is connected to the second terminal b of two interleaved parallel BUCK circuits, the anode of another diode , and the drain of another insulated gate bipolar transistor ; the source of another insulated gate bipolar transistor is connected to the cathode of one of the second diodes ; the cathode of another second diode is connected to the third terminal c of two interleaved parallel BUCK circuits.

[0045] Among them, the source of one insulated gate bipolar transistor is connected to the first terminal a of two interleaved parallel BUCK circuits and the anode of one of the second diodes , that is, 's source is connected to and 's anode; the drain of one insulated gate bipolar transistor is connected to the second terminal b of two interleaved parallel BUCK circuits, that is, 's drain is connected to and 's other end; the cathode of another second diode is connected to the third terminal c of two interleaved parallel BUCK circuits, that is, 's cathode is connected to and 's source.

[0046] Further, the circuit module can also be externally connected to a load. The externally connected load can be, for example, devices such as resistors, inductors, light-emitting diodes, etc., which are not limited here. For example, if the externally connected load is a light-emitting diode LD, the anode of LD can be connected to 's cathode and 's source, and the cathode of LD can be connected to 's anode and 's drain.

[0047] Among them, the circuit module further includes a post-stage energy storage capacitor . One end of the post-stage energy storage capacitor is connected to the first terminal a of two interleaved parallel BUCK circuits, and the other end of the post-stage energy storage capacitor is connected to the third terminal c of two interleaved parallel BUCK circuits.

[0048] It should be noted that each circuit module may include a post-stage energy storage capacitor ( ), two insulated gate bipolar transistors ( and ), two second diodes ( and ), and a load (LD); alternatively, multiple circuit modules may include a post-stage energy storage capacitor ( ), two insulated gate bipolar transistors ( and ), two second diodes ( and ), and a load (LD); the two are equivalent. For example, the post-stage energy storage capacitor of the latter is the sum of the multiple post-stage energy storage capacitors of the former, and the load of the latter is the sum of the multiple loads of the former. Both embodiments and their equivalent embodiments are within the protection scope of this application.

[0049] As shown by Figure 3 the drive signal, the working principle of the above circuit module is as follows: In the first stage, is turned on, and at the same time, interleaved PWM drive signals are applied to and . The post-stage energy storage capacitor will charge the energy storage inductors and . After charging to the preset current value, the next action is performed. In the second stage, is turned off, and is turned on. When and are both turned off, the current will flow through the diodes and , and then through the semiconductor load LD to discharge the load LD. When and are both turned on, the current will not flow through the diodes and , and will discharge through and . In the third stage, and are both turned off, and the current of the energy storage inductors and will flow back to the energy storage capacitor through the diodes and to feedback energy. The current of the semiconductor pump load will flow through the diode for freewheeling.

[0050] Among them, the charging time in the first stage is the on-time of ​ as follows:

[0051]

[0052] is a preset inductor current value, is a energy storage inductor and is the inductance value of is the preset voltage value of the post-stage energy storage capacitor . The turn-on time of is the pulse width of the output current pulse.

[0053] It can be seen that in the embodiment of the present application, by modularizing the pulse forming circuit, the current and voltage stress of the devices can be reduced, and the reliability of the power supply can be increased. The modular design makes the output more flexible, with strong scalability and easy fault replacement. In addition, by interleaving and paralleling two BUCK circuits, the ripple of the output pulse current can be further reduced. Further, in the current prior art, mainly using the linear mode will cause a large amount of heat generation in the devices, requiring a large area of heat dissipation materials and making it difficult to reduce the volume of the entire power supply. The BUCK circuit includes field effect transistors ( and ), and adopts a switching power supply control mode, which has higher efficiency than the traditional linear constant current source mode, reduces the demand for heat dissipation, and can further reduce the volume of the power supply; finally, from its working principle, it can be seen that in the present application, the energy storage inductor is first charged and then discharged to the post-stage load, and the structure using IGBT ( and ) to isolate the energy storage inductor and the post-stage load can obtain a faster pulse rising edge.

[0054] In an embodiment of the present application, the pre-stage charging circuit 110 includes a rectifying circuit 111, and the rectifying circuit 111 includes a plurality of third diodes and a bus capacitor. The plurality of third diodes are connected in parallel with the bus capacitor, wherein the plurality of third diodes are connected in series in pairs and then in parallel. If the input alternating current is two-phase, it includes 4 third diodes; if the input alternating current is three-phase, it includes 6 third diodes; the number of third diodes is determined according to the input alternating current. Please refer to Figure 4 , which shows a schematic structural diagram of a three-phase rectifying circuit provided by an embodiment of the present application. The three-phase rectifying circuit includes 6 third diodes and a bus capacitor , and are connected in series, and are connected in series, and are connected in series, and the capacitors after series connection are then connected in parallel and are also connected to the bus capacitor In parallel. The three phases of three-phase alternating current AC are respectively connected to the negative electrode and the positive electrode of the negative electrode and the positive electrode of the negative electrode and the positive electrode of. The input voltage of the three-phase alternating current AC can be 220V, 380V, or other values. The input voltage of the three-phase alternating current AC reaches through the three-phase rectifier circuit, changing from alternating current to direct current; the input voltage of then reaches through the following phase-shifted full-bridge DC conversion circuit 112, changing from direct current to direct current.

[0055] In an embodiment of the present application, the pre-stage charging circuit 110 further includes a phase-shifted full-bridge DC conversion circuit 112 connected to the rectifier circuit 111. The phase-shifted full-bridge DC conversion circuit 112 includes a first H-bridge circuit, a first inductor, a transformer, a second H-bridge circuit, and a second inductor cascaded in sequence; wherein, the first H-bridge circuit includes four second field-effect transistors, and the second H-bridge circuit includes four fourth diodes. Please refer to Figure 5 which shows a schematic structural diagram of a phase-shifted full-bridge DC conversion circuit provided by an embodiment of the present application. The first H-bridge circuit is and connected in series, and connected in series, and the two are then connected in parallel; similarly, the second H-bridge circuit is and connected in series, and connected in series, and the two are then connected in parallel. One end of the first inductor is connected to the source electrode of and the drain electrode of , the other end of the first inductor is connected to one end of the primary coil of the transformer, the other end of the primary coil of the transformer is connected to the source electrode of and the drain electrode of , one end of the secondary coil of the transformer is connected to the negative electrode of and the positive electrode of , the other end of the secondary coil of the transformer is connected to the negative electrode of and the positive electrode of , one end of the second inductor is connected to and the positive electrode of.

[0056] Among them, when the pre-stage charging control unit 220 works, and Have the same PWM signal, and Have the same PWM signal and are with and A phase difference of 180 degrees.

[0057] Please refer to Figure 6 , which shows a schematic structural diagram of the main circuit of a high-power laser pulse current source circuit provided by an embodiment of the present application. The main circuit 100 includes a cascaded pre-stage charging circuit 110 and a pulse forming circuit 120. The pre-stage charging circuit 110 includes a rectifying circuit 111 and a phase-shifted full-bridge DC conversion circuit 112. The bus capacitor of the rectifying circuit 111 Serves as the input capacitor of the phase-shifted full-bridge DC conversion circuit 112 and is connected to the drain of the Of the phase-shifted full-bridge DC conversion circuit 112 and the source of the ; The other end of the second inductor of the phase-shifted full-bridge DC conversion circuit 112 And the Negative pole of are connected to the post-stage energy storage capacitor .

[0058] Among them, the diodes used in the embodiments of the present application can all be Schottky diodes, and the field effect transistors can all be SiC mos transistors. For the specific and detailed introduction of the rectifying circuit 111, the phase-shifted full-bridge DC conversion circuit 112 and the pulse forming circuit 120, please refer to the embodiments in Figures 1-5 , and will not be elaborated here.

[0059] The second aspect of the embodiments of the present application provides a current source, and the current source includes the high-power laser pulse current source circuit as described in any one of the above first aspects.

[0060] The third aspect of the embodiments of the present application provides a control method for a high-power laser pulse current source circuit. Please refer to Figure 7 , which shows a schematic flow diagram of a control method for a high-power laser pulse current source circuit provided by an embodiment of the present application. The high-power laser pulse current source circuit includes a main circuit and a control circuit. The main circuit includes a cascaded pre-stage charging circuit and a pulse forming circuit. The control circuit includes a cascaded total control unit, a pre-stage charging control unit, and a post-stage pulse forming control unit. The method includes:

[0061] The total control unit sends a start signal to the pre-stage charging control unit;

[0062] After receiving the start signal, the pre-stage charging control unit charges the post-stage energy storage capacitor in the pulse forming circuit through the pre-stage charging circuit;

[0063] The total control unit sends a current pulse formation signal to the post-stage pulse formation control unit;

[0064] After receiving the current pulse formation signal sent by the total control unit, the post-stage pulse formation control unit discharges the post-stage energy storage capacitor to control the pulse formation circuit to output the pulse current required for pumping the semiconductor laser.

[0065] Optionally, the method further includes:

[0066] During the pulse current interval, the voltage of the post-stage energy storage capacitor is detected by a voltage sensor;

[0067] If the voltage of the post-stage energy storage capacitor is lower than the minimum set voltage threshold, the pre-stage charging control unit charges the post-stage energy storage capacitor in the pulse formation circuit through the pre-stage charging circuit;

[0068] If the voltage of the post-stage energy storage capacitor is higher than the maximum set voltage threshold, the pre-stage charging control unit stops charging the post-stage energy storage capacitor in the pulse formation circuit through the pre-stage charging circuit.

[0069] It should be noted that for the detailed introduction on the method side, please refer to the above Figures 1-6 introduction on the circuit side, which will not be elaborated here.

[0070] Figure 8 The structural schematic diagram of a computer device provided by an embodiment of the present application is shown, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it realizes the functions of the computer system for the control method of the high-power laser pulse current source circuit in any of the above embodiments.

[0071] An embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a computer, the computer realizes the functions of the computer system for the control method of the high-power laser pulse current source circuit in any of the above embodiments.

[0072] An embodiment of the present application also provides a computer program product including instructions. When the instructions are executed by a computer, the computer realizes the functions of the computer system for the control method of the high-power laser pulse current source circuit in any of the above embodiments.

[0073] It can be understood that the specific examples in the present application are only for helping those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the present invention.

[0074] It can be understood that in various embodiments of the present application, the magnitude of the serial numbers of the various processes does not imply the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not impose any limitation on the implementation process of the embodiments of the present application.

[0075] It can be understood that the various embodiments described in the present application can be implemented alone or in combination, and the embodiments of the present application do not limit this.

[0076] Unless otherwise specified, all technical and scientific terms used in the embodiments of the present application have the same meaning as commonly understood by those skilled in 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 embodiments of the present application includes any and all combinations of one or more of the related listed items. The singular forms "a", "above-mentioned" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0077] It can be understood that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit in the hardware of the processor or by instructions in software form. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0078] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0079] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0080] 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 foregoing method embodiments, and will not be repeated here.

[0081] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, 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 displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in an electrical, mechanical, or other form.

[0082] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0083] In addition, the functional units in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0084] When a 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 this application, in essence, or the part that contributes to the prior art or 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 and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0085] The above is only the specific implementation manner of this application, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A high-power laser pulse current source circuit, characterized in that: The high-power laser pulse current source circuit includes a main circuit and a control circuit, wherein the main circuit includes a cascaded front-stage charging circuit and a pulse forming circuit, wherein the control circuit includes a general control unit, a front-stage charging control unit and a rear-stage pulse forming control unit which are cascaded in sequence, wherein the pulse forming circuit includes a plurality of circuit modules connected in parallel, wherein each circuit module includes two staggered parallel BUCK circuits, wherein the two staggered parallel BUCK circuits include two first diodes, two first field effect transistors and two energy storage inductors; wherein the positive electrodes of the two first diodes are connected, the source electrodes of the two first field effect transistors are connected, the negative electrode of one of the first diodes is connected to one end of one of the energy storage inductors and the drain electrode of one of the first field effect transistors, the negative electrode of another first diode is connected to one end of another energy storage inductor and the drain electrode of another first field effect transistor, and the other ends of the two energy storage inductors are connected; The front-stage charging control unit charges the rear-stage energy storage capacitor through the front-stage charging circuit within the pulse current interval time after receiving the start signal sent by the main control unit or detecting that the voltage of the rear-stage energy storage capacitor in the pulse forming circuit is lower than the minimum set voltage threshold; the rear-stage pulse forming control unit is used to discharge through the rear-stage energy storage capacitor after receiving the forming current pulse signal sent by the main control unit, so as to control the pulse forming circuit to output the pulse current required for semiconductor laser pumping.

2. The high-power laser pulse current source circuit according to claim 1, characterized in that: The circuit module also includes two insulated gate bipolar transistors and two second diodes, wherein the source of one of the insulated gate bipolar transistors is connected to the first ends of the two interlaced parallel BUCK circuits and the anode of one of the second diodes, the drain of one of the insulated gate bipolar transistors is connected to the second ends of the two interlaced parallel BUCK circuits, the anode of another diode and the drain of another insulated gate bipolar transistor, the source of another insulated gate bipolar transistor is connected to the cathode of one of the second diodes, and the cathode of another second diode is connected to the third ends of the two interlaced parallel BUCK circuits.

3. The high-power laser pulse current source circuit according to claim 2, characterized in that: The circuit module also includes the post-stage energy storage capacitor, one end of which is connected to the first end of the two interlaced parallel BUCK circuits, and the other end of which is connected to the third end of the two interlaced parallel BUCK circuits.

4. The high-power laser pulse current source circuit according to claim 1, characterized in that: The front-stage charging circuit includes a rectifier circuit, which includes a plurality of third diodes and a bus capacitor. The plurality of third diodes are connected in parallel with the bus capacitor, wherein the plurality of third diodes are connected in series in pairs and then in parallel.

5. The high-power laser pulse current source circuit according to claim 4, characterized in that: The front-stage charging circuit also includes a phase-shifted full-bridge DC conversion circuit connected to the rectifier circuit, and the phase-shifted full-bridge DC conversion circuit includes a first H-bridge circuit, a first inductor, a transformer, a second H-bridge circuit and a second inductor that are cascaded in sequence; wherein the first H-bridge circuit includes four second field-effect transistors, and the second H-bridge circuit includes four fourth diodes.

6. A current source, characterized in that: The current source comprises the high-power laser pulse current source circuit as described in any one of claims 1-5.

7. A control method for a high-power laser pulse current source circuit, characterized in that: The high-power laser pulse current source circuit comprises a main circuit and a control circuit, wherein the main circuit comprises a cascaded front-stage charging circuit and a pulse forming circuit, wherein the control circuit comprises a total control unit, a front-stage charging control unit and a rear-stage pulse forming control unit which are cascaded in sequence, wherein the pulse forming circuit comprises a plurality of circuit modules connected in parallel, wherein each circuit module comprises two staggered parallel BUCK circuits, wherein the two staggered parallel BUCK circuits comprise two first diodes, two first field effect transistors and two energy storage inductors; wherein the positive electrodes of the two first diodes are connected, the source electrodes of the two first field effect transistors are connected, the negative electrode of one of the first diodes is connected to one end of one of the energy storage inductors and the drain electrode of one of the first field effect transistors, the negative electrode of another first diode is connected to one end of another energy storage inductor and the drain electrode of another first field effect transistor, and the other ends of the two energy storage inductors are connected, and the method comprises: The general control unit sends a start signal to the front-stage charging control unit; After receiving the start signal, the front-stage charging control unit charges the rear-stage energy storage capacitor in the pulse forming circuit through the front-stage charging circuit; The general control unit sends a forming current pulse signal to the subsequent pulse forming control unit; The latter pulse forming control unit is used to discharge through the latter energy storage capacitor after receiving the forming current pulse signal sent by the main control unit, so as to control the pulse forming circuit to output the pulse current required for semiconductor laser pumping.

8. The control method according to claim 7, characterized in that: The method further comprises: During the pulse current interval, the voltage of the subsequent energy storage capacitor is detected by a voltage sensor; If the voltage of the latter energy storage capacitor is lower than the minimum set voltage threshold, the former charging control unit charges the latter energy storage capacitor in the pulse forming circuit through the former charging circuit; If the voltage of the rear-stage energy storage capacitor is higher than the maximum set voltage threshold, the front-stage charging control unit stops charging the rear-stage energy storage capacitor in the pulse forming circuit through the front-stage charging circuit.

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