Laser pulse generation circuit and method and laser

Abstract

The invention discloses a laser pulse generation circuit and method and a laser. The laser pulse generation circuit comprises a master control unit, a high-frequency module control circuit, a low-frequency module control circuit, a high-frequency module and a low-frequency module. According to the scheme, a switching power supply control mode is adopted, the efficiency is higher than that of a traditional linear constant current source mode, the requirement for heat dissipation of the laser can be lowered, and the size of the laser power supply can be further reduced to a certain extent. Besides, the scheme of the invention adopts a modular design, so that the current and voltage stress of the device can be reduced, the reliability of the power supply is improved, the modular design enables the output to be more flexible and the expandability to be strong, and when the circuit breaks down, only the corresponding module needs to be replaced, which is more convenient.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and more particularly to a laser pulse generation circuit, method, and laser. 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, high-quality pulsed current waveforms have high requirements for rise and fall times in terms of dynamics. At the same time, in terms of stability, current ripple, overshoot, reverse current, etc. are required to meet high standards. Traditional high-power pulsed current sources using linear mode control have problems such as low efficiency, low repetition frequency, and narrow output current pulse width, and it is difficult to be used as an efficient laser power supply.

[0003] It should be noted that the information disclosed in the background art section of this invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a laser pulse generation circuit, method, and laser, which are used to solve the problems of low efficiency, low repetition frequency, and narrow output current pulse width existing in traditional high-power pulsed current sources using linear mode control.

[0005] To solve the above technical problems, the present invention proposes a laser pulse generation circuit, including: A total control unit, which is configured to receive a user demand instruction and output it to a high-frequency module control circuit and a low-frequency module control circuit, and the user demand instruction includes the magnitude of the laser load output current ripple signal, the frequency, pulse width, and power of the laser load; A high-frequency module control circuit, which is configured to receive the user demand instruction and output a corresponding first control signal to the high-frequency module; A high-frequency module, which is configured to receive power supply from a power supply module and output a corresponding first voltage signal to the low-frequency module according to the first control signal; A low-frequency module control circuit, which is configured to receive the user demand instruction and output a corresponding second control signal to the low-frequency module, and both the first control signal and the second control signal are digital signals; A low-frequency module, which is configured to output a corresponding first pulse signal to a corresponding laser load according to the second control signal and the first voltage signal to drive the laser load.

[0006] Optionally, the high-frequency module includes an interleaved parallel BUCK circuit.

[0007] Optionally, the number of the interleaved parallel BUCK circuits is multiple groups, and the multiple groups of interleaved parallel BUCK circuits are connected in parallel.

[0008] Optionally, each group of the interleaved parallel BUCK circuits includes a first diode, a second diode, a first MOS transistor, a second MOS transistor, a first inductor, and a second inductor; The anode of the first diode is electrically connected to the drain of the first MOS transistor at a first connection point, the cathode of the first diode is electrically connected to the positive electrode of the power supply module and the low-frequency module, the source of the first MOS transistor is electrically connected to the negative electrode of the power supply module and the low-frequency module, and the first end of the first inductor is electrically connected to the first connection point; The anode of the second diode is electrically connected to the drain of the second MOS transistor at a second connection point, the cathode of the second diode is electrically connected to the positive electrode of the power supply module and the low-frequency module, the source of the second MOS transistor is electrically connected to the negative electrode of the power supply module and the low-frequency module, and the first end of the second inductor is electrically connected to the second connection point; The second end of the first inductor is electrically connected to the second end of the second inductor at a third connection point, and the low-frequency module is also electrically connected to the third connection point; The gates of the first MOS transistor and the second MOS transistor are both electrically connected to the high-frequency module control circuit to receive the first control signal.

[0009] Optionally, the low-frequency module includes a first IGBT module, a second IGBT module, a third diode, and a fourth diode; The collector of the first IGBT module is electrically connected to the cathode of the first diode and the cathode of the fourth diode, and the emitter of the first IGBT module is electrically connected to the third connection point and the cathode of the third diode; The emitter of the second IGBT module is electrically connected to the third connection point, the collector of the second IGBT module is electrically connected to the anode of the fourth diode and the negative electrode of the laser load, and the cathode of the fourth diode is also electrically connected to the positive electrode of the laser load; The gates of the first IGBT module and the second IGBT are both electrically connected to the low-frequency module control circuit to receive the second control signal.

[0010] Optionally, when the first IGBT module is in the on state and the second IGBT module is in the off state, interleaved PWM signals are simultaneously applied to the gates of the first MOS transistor and the second MOS transistor to charge the first inductor and the second inductor.

[0011] Optionally, when the first IGBT module is in the off state and the second IGBT module is in the on state, before the first MOS transistor and the second MOS transistor are both in the on state, the laser load is powered by the first diode and the second diode. Optionally, when the first IGBT module, the second IGBT module, the first MOS transistor, and the second MOS transistor are all in the off state, the current stored in the first inductor and the second inductor flows back to the power supply module through the first diode and the second diode.

[0012] Optionally, the total control unit, the high-frequency module control circuit, and the low-frequency module control circuit are all implemented using DSP chips.

[0013] Optionally, the laser pulse generation circuit further includes a protection circuit, which is electrically connected to the high-frequency module and the low-frequency module, and is used to provide overcurrent and over-temperature protection for the high-frequency module and the low-frequency module.

[0014] Based on the same inventive concept, the present invention also proposes a method for generating laser pulses, the method comprising: The total control unit receives a user demand instruction and outputs it to the high-frequency module control circuit and the low-frequency module control circuit, and the user demand instruction includes the magnitude of the laser load output current ripple signal, the frequency, pulse width, and power of the laser load; The high-frequency module control circuit receives the user demand instruction and outputs a corresponding first control signal to the high-frequency module, and the user demand instruction includes the frequency and pulse width of the laser load; The high-frequency module receives power supply from the power supply module and outputs a corresponding first voltage signal to the low-frequency module according to the first control signal; The low-frequency module control circuit receives the user demand instruction and outputs a corresponding second control signal to the low-frequency module, and both the first control signal and the second control signal are digital signals; The low-frequency module outputs a corresponding first pulse signal to the corresponding laser load according to the second control signal and the first voltage signal to drive the laser load.

[0015] Based on the same inventive concept, the present invention also proposes a laser, comprising the laser pulse generation circuit described in any one of the above characteristic descriptions.

[0016] Compared with the prior art, the present invention has the following beneficial effects: A laser pulse generation circuit proposed by the present invention includes a total control unit, a high-frequency module control circuit, a low-frequency module control circuit, a high-frequency module, and a low-frequency module. The total control unit is configured to receive a user demand instruction and output it to the high-frequency module control circuit and the low-frequency module control circuit. The user demand instruction includes the magnitude of the laser load output current ripple signal, the frequency, pulse width, and power of the laser load. The high-frequency module control circuit is configured to receive the user demand instruction and output a corresponding first control signal to the high-frequency module. The high-frequency module is configured to receive power supply from a power supply module and output a corresponding first voltage signal to the low-frequency module according to the first control signal. The low-frequency module control circuit is configured to receive the user demand instruction and output a corresponding second control signal to the low-frequency module. Both the first control signal and the second control signal are digital signals. The low-frequency module is configured to output a corresponding first pulse signal to a corresponding laser load according to the second control signal and the first voltage signal to drive the laser load. The solution of the present invention adopts a switching power supply control mode, which has higher efficiency than the traditional linear constant current source mode, can reduce the heat dissipation requirement of the laser, and can further reduce the volume of the laser power supply to a certain extent. In addition, the solution of the present application adopts a modular design, which can reduce the current and voltage stress of the device, increase the reliability of the power supply, and the modular design makes the output more flexible and has strong scalability. When a fault occurs in the circuit, only the corresponding module needs to be replaced, which is more convenient.

[0017] The laser pulse generation method and laser proposed by the present invention belong to the same inventive concept as the laser pulse generation circuit, and thus have the same beneficial effects, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the laser pulse generation circuit proposed by an embodiment of the present invention; Figure 2 is a timing diagram of the drive signal of the laser pulse generation circuit proposed by an embodiment of the present invention; Figure 3 is an experimental result diagram using the laser pulse generation circuit in an embodiment of the present invention; Figure 4 is a schematic flow diagram of the laser pulse generation method proposed by another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The specific embodiments of the present invention will be described in more detail below in conjunction with the schematic diagrams. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the attached drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] Please refer to Figure 1 , this embodiment proposes a laser pulse generation circuit, including: A total control unit, which is configured to receive a user demand instruction and output it to a high-frequency module control circuit and a low-frequency module control circuit. The user demand instruction includes the magnitude of the laser load output current ripple signal, the frequency, pulse width, and power of the laser load; A high-frequency module control circuit, which is configured to receive the user demand instruction and output a corresponding first control signal to the high-frequency module; A high-frequency module, which is configured to receive power supply from a power supply module and output a corresponding first voltage signal to the low-frequency module according to the first control signal; A low-frequency module control circuit, which is configured to receive the user demand instruction and output a corresponding second control signal to the low-frequency module. The first control signal and the second control signal are both digital signals; A low-frequency module, which is configured to output a corresponding first pulse signal to a corresponding laser load according to the second control signal and the first voltage signal to drive the laser load.

[0022] Different from the prior art, a laser pulse generation circuit proposed in this embodiment includes a total control unit, a high-frequency module control circuit, a low-frequency module control circuit, a high-frequency module, and a low-frequency module. The total control unit is configured to receive a user demand instruction and output it to the high-frequency module control circuit and the low-frequency module control circuit. The user demand instruction includes the magnitude of the laser load output current ripple signal, the frequency, pulse width, and power of the laser load. The high-frequency module control circuit is configured to receive the user demand instruction and output a corresponding first control signal to the high-frequency module. The high-frequency module is configured to receive power supply from a power supply module and output a corresponding first voltage signal to the low-frequency module according to the first control signal. The low-frequency module control circuit is configured to receive the user demand instruction and output a corresponding second control signal to the low-frequency module. Both the first control signal and the second control signal are digital signals. The low-frequency module is configured to output a corresponding first pulse signal to a corresponding laser load according to the second control signal and the first voltage signal to drive the laser load. The solution of the present invention adopts a switching power supply control mode, which has higher efficiency than the traditional linear constant current source mode, can reduce the heat dissipation requirement of the laser, and can further reduce the volume of the laser power supply to a certain extent. In addition, the solution of this application adopts a modular design, which can reduce the current and voltage stress of the devices, increase the reliability of the power supply. The modular design makes the output more flexible and has strong scalability. When a fault occurs in the circuit, only the corresponding module needs to be replaced, which is more convenient.

[0023] Those skilled in the art can understand that in this embodiment, both the first control signal and the second control signal are digital signals. The total control unit, the high-frequency module control circuit, and the low-frequency module control circuit can be any electronic devices that can process data and generate corresponding digital signals. The total control unit, the high-frequency module control circuit, and the low-frequency module control circuit are preferably implemented using a DSP (Digital Signal Processing) chip.

[0024] In the present application, the control system composed of the general control unit, the high-frequency module control circuit, and the low-frequency module control circuit is equivalent to using a system where multiple DSPs cooperate to meet corresponding control requirements. This is because although the performance of DSPs is getting stronger and the functions of DSP-based embedded systems are increasing, for applications in multi-task signal processing and multi-channel process control with high requirements for real-time performance, fault tolerance, and reliability, the processing power of a single DSP embedded system is insufficient. Distributed systems have strong processing capabilities and high reliability. By using multiple DSP embedded subsystems to form a distributed system and leveraging the concurrency of the distributed system to achieve parallel processing of multiple DSPs, the requirements for multi-control tasks and real-time performance can be met. In this embodiment, the general control unit, the high-frequency module control circuit, and the low-frequency module control circuit can all be implemented using TMS320F2812. Information exchange can be carried out between the three DSPs through the CAN bus. In some application scenarios where the requirement for data interaction speed is not high, exchange can also be carried out through the UART serial port. The specific implementation methods of the general control unit, the high-frequency module control circuit, and the low-frequency module control circuit are not limited herein.

[0025] In other embodiments, the general control unit, the high-frequency module control circuit, and the low-frequency module control circuit can also be implemented using other devices with similar functions, such as using chips with data processing functions like MCU (Microcontroller Unit), MPU (Microprocessor Unit), FPGA (Field Programmable Gate Array), etc.

[0026] It should be noted that in this embodiment, what the general control unit outputs to the high-frequency module control circuit is the magnitude of the laser load output current ripple signal in the user demand instruction, and what the general control unit outputs to the low-frequency module control circuit are the frequency, pulse width, and power of the laser load in the user demand instruction.

[0027] Please continue to refer to Figure 1 , specifically, in this embodiment, the high-frequency module includes an interleaved parallel BUCK circuit. In the solution of this embodiment, the high-frequency module adopts the interleaved parallel BUCK technology, which can effectively reduce the output current ripple. Moreover, the multi-phase interleaved manner of the pulse generation circuit can greatly reduce the current and voltage stress of the devices, making the output power range more flexibly adjustable.

[0028] Further, in order to meet the requirements of high-power applications of semiconductor lasers, the present application proposes a solution of connecting multiple groups of the interleaved parallel BUCK circuits in parallel. Specifically, the number of the interleaved parallel BUCK circuits is multiple groups, and the multiple groups of the interleaved parallel BUCK circuits are connected in parallel. It should be noted that the number of the interleaved parallel BUCK circuits in the high-frequency module can be dynamically adjusted according to the actual power demand, which can be two groups, three groups, or more groups can be set, and no limitation is made here.

[0029] The following gives a detailed description of the interleaved parallel BUCK circuit. In this embodiment, each group of the interleaved parallel BUCK circuits includes a first diode D1, a second diode D2, a first MOS transistor S1, a second MOS transistor S2, a first inductor L1, and a second inductor L2; The anode of the first diode D1 is electrically connected to the drain of the first MOS transistor S1 at a first connection point A. The cathode of the first diode D1 is electrically connected to the positive electrode of the power supply module and the low-frequency module. The source of the first MOS transistor S1 is electrically connected to the negative electrode of the power supply module and the low-frequency module. The first end of the first inductor L1 is electrically connected to the first connection point A; The anode of the second diode D2 is electrically connected to the drain of the second MOS transistor S2 at a second connection point B. The cathode of the second diode D2 is electrically connected to the positive electrode of the power supply module and the low-frequency module. The source of the second MOS transistor S2 is electrically connected to the negative electrode of the power supply module and the low-frequency module. The first end of the second inductor L2 is electrically connected to the second connection point B; The second end of the first inductor L1 is electrically connected to the second end of the second inductor L2 at a third connection point C. The low-frequency module is also electrically connected to the third connection point C; The gates of the first MOS transistor S1 and the second MOS transistor S2 are both electrically connected to the high-frequency module control circuit to receive the first control signal.

[0030] Those skilled in the art can understand that when the number of the interleaved parallel BUCK circuits is multiple groups, they are connected in parallel to Figure 1 Taking the circuit structure shown in as an example, when the interleaved parallel BUCK circuits are multiple groups, the three external connection points of the multiple groups of interleaved parallel BUCK circuits are respectively connected at the third connection point, the positive electrode of the power supply module, and the negative electrode of the power supply module. Preferably, in this embodiment, the first MOS transistor S1 and the second MOS transistor S2 in the interleaved parallel BUCK circuit both adopt the third-generation semiconductor SiC device, which can obtain a higher switching frequency and further reduce the ripple of the output current pulse of the circuit.

[0031] In this embodiment, the high-frequency module control circuit is mainly responsible for controlling the interleaved parallel BUCK circuit to adjust the current level, pulse width, and frequency of the output pulse. The high-frequency module control circuit may also have inductor current sharing control. By setting the same reference value for the currents of different branches. For example, the current signal sampled by the current sensor can be converted into a voltage signal through a sampling resistor, and the voltage signal is compared with the reference value, and then passed through a PI regulator to output a suitable PWM wave in real time to control the first MOS transistor S1 and the second MOS transistor S2. Then, the PWM waveform is phase-shifted by 180°, and the two interleaved parallel circuits are respectively controlled to achieve precise control of the branch current. Specifically, the high-frequency module control circuit is used to control the first MOS transistor S1 with a first PWM signal, and the high-frequency module control circuit is used to control the second MOS transistor S2 with a second PWM signal. There is a 180° phase difference between the first PWM signal and the second PWM signal. Specifically, in this embodiment, the low-frequency module includes a first IGBT module Q1, a second IGBT module Q2, a third diode D3, and a fourth diode D4; The collector of the first IGBT module Q1 is electrically connected to the cathode of the first diode and the cathode of the fourth diode D4, and the emitter of the first IGBT module Q1 is electrically connected to the third connection point C and the cathode of the third diode D3; The emitter of the second IGBT module Q2 is electrically connected to the third connection point, the collector of the second IGBT module Q2 is electrically connected to the anode of the fourth diode D4 and the negative electrode of the laser load, and the cathode of the fourth diode D4 is also electrically connected to the positive electrode of the laser load; The gates of the first IGBT module Q1 and the second IGBT are both electrically connected to the low-frequency module control circuit to receive the second control signal.

[0032] In this embodiment, the low-frequency module uses IGBT power devices, which can facilitate the input of control signals, reduce the control difficulty, shorten the control time, ensure the control synchronization, and avoid the turn-on delay problem caused by the parallel connection of multiple discrete devices. The high-frequency module proposed in this embodiment is driven by MOS transistors, and the low-frequency module is driven by IGBT power modules. Since MOS transistors are small-power high-frequency devices and IGBT power modules are large-power low-frequency devices, this hybrid device structure can meet the requirements of high-frequency high-power scenarios and can achieve synchronous control of signals, facilitating PCB layout and heat dissipation. In addition, the use of hybrid devices can be applied to operations under different working conditions, improving the application range and stability of the devices. At high frequencies, the loss of SiC-MOSFET is small, and the Si-IGBT power module can operate stably under large current and high power. Specifically, in this embodiment, when the first IGBT module Q1 is in the on state and the second IGBT module Q2 is in the off state, interleaved PWM signals are applied to the gates of the first MOS transistor S1 and the second MOS transistor S2 simultaneously to charge the first inductor L1 and the second inductor L2.

[0033] Specifically, in this embodiment, when the first IGBT module Q1 is in the off state and the second IGBT module Q2 is in the on state, before the first MOS transistor S1 and the second MOS transistor S2 are both in the on state, the laser load is powered by the first diode and the second diode. Specifically, in this embodiment, when the first IGBT module Q1, the second IGBT module Q2, the first MOS transistor S1, and the second MOS transistor S2 are all in the off state, the current stored in the first inductor L1 and the second inductor L2 flows back to the power supply module through the first diode and the second diode.

[0034] As can be seen from the previous description, in this embodiment, the high-frequency module is formed by multiple groups of interleaved parallel BUCK circuits. Each group of interleaved parallel BUCK circuits can output a pulsed current of up to 50A. The interleaved parallel technology of the present application can effectively reduce the output current ripple.

[0035] The drive signals of the interleaved parallel BUCK circuit and the first IGBT module Q1 and the second IGBT module Q2 are as Figure 2 shown Figure 2 The timing diagrams of the control signals received by the gates of the first MOS, the second MOS transistor, the first IGBT module Q1, and the second IGBT module Q2 are shown from top to bottom. The following is combined with the attached Figure 2Briefly describe the working process of the laser pulse generation circuit proposed in this embodiment: In the first stage, first, the first IGBT module Q1 is turned on through the second control signal, and at the same time, interleaved PWM drive signals are applied to the first MOS transistor S1 and the second MOS transistor S2. The first stage can be understood as the charging process of the first inductor L1 and the second inductor L2.

[0036] In the second stage, the first IGBT module Q1 is turned off and the second IGBT module Q2 is turned on through the second control signal. When both the first MOS transistor S1 and the second MOS transistor S2 are turned off, the current will flow through the first diode D1 and the second diode D2 and then through the laser load to discharge the laser load. When both the first MOS transistor S1 and the second MOS transistor S2 are turned on, the current will not flow through the first diode D1 and the second diode D2 and will discharge through the first MOS transistor S1 and the second MOS transistor S2. In the second stage, we hope that the current of the laser load is continuous. Therefore, before the first MOS transistor S1 and the second MOS transistor S2 are turned on, the first diode D1 and the second diode D2 are used for freewheeling.

[0037] In the third stage, when the first control signal and the second control signal cause the first MOS transistor S1, the second MOS transistor S2, the first IGBT module Q1, and the second IGBT module Q2 to be all turned off, the currents of the first inductor L1 and the second inductor L2 will flow back to the power supply module through the first diode D1 and the second diode D2 to feedback energy, saving resources to a certain extent.

[0038] It should be noted that in this embodiment, the conduction time of the first IGBT module Q1 in the on state in the above first stage is t 1 , t 1 satisfies the following relationship:

[0039] where L is the inductance value of the first inductor, i L is the preset inductor current value, and u c2 is the output voltage magnitude of the power supply module.

[0040] In this embodiment, the laser pulse generation circuit adopts a structure that first charges the energy storage inductor and then discharges the subsequent laser load. Using the IGBT module to isolate the energy storage inductor and the subsequent laser load can obtain a faster pulse rise edge. In addition, in this embodiment, the inductance values of the first inductor L1 and the second inductor L2 are the same.

[0041] Furthermore, considering that in practical applications, excessive current or high temperature may cause damage to the circuit and the laser load, the laser pulse generation circuit further includes a protection circuit. The protection circuit is electrically connected to the high-frequency module and the low-frequency module, and is used to provide over-current and over-temperature protection for the high-frequency module and the low-frequency module. In this embodiment, the protection circuit can be divided into an over-current protection circuit and an over-temperature protection circuit. Among them, the over-temperature protection circuit is used to detect the temperature inside the laser device and automatically cut off the power supply when the temperature exceeds the set threshold to prevent the laser device from being damaged due to overheating. Devices with a negative temperature coefficient, such as thermistors or transistors, can be used to detect temperature changes. When the temperature rises, the resistance or voltage of these devices will change, thus triggering the protection mechanism. For example, a CMOS-based over-temperature protection circuit can be designed to shut down the system when the temperature reaches 138 °C to protect the circuit and resume normal operation when the temperature drops to 126 °C. In addition, the over-temperature protection circuit may also include a hysteresis function to prevent frequent opening and closing of the protection mechanism near the critical temperature and reduce device losses.

[0042] The over-current protection circuit automatically cuts off the output of the power supply when the output current of the power supply is too large to avoid over-current damage to the power supply and the laser load. Over-current protection can include short-circuit protection and overload protection. Short-circuit protection can use an electromagnetic current breaker or a fuse. Overload protection can use a thermal relay or a time-delay type electromagnetic current relay, which is commonly used as an overload protection element. The over-current protection circuit can be implemented in various ways. For example, a comparator, a current sensor, or a specific power MOSFET can also be used to detect and limit the current.

[0043] Figure 3 For the experimental result diagram of the laser pulse generation circuit in this embodiment, it can be seen from the figure that a relatively fast rising edge can be obtained by using the solution in this embodiment.

[0044] Please refer to Figure 4 , based on the same inventive concept, the embodiment of the present invention also proposes a laser pulse generation method, which includes: S100: The total control unit receives a user demand instruction and outputs it to the high-frequency module control circuit and the low-frequency module control circuit. The user demand instruction includes the magnitude of the laser load output current ripple signal, the frequency, pulse width, and power of the laser load; S200: The high-frequency module control circuit receives the user demand instruction and outputs a corresponding first control signal to the high-frequency module. The user demand instruction includes the frequency and pulse width of the laser load; S300: The high-frequency module receives power supply from the power supply module and outputs a corresponding first voltage signal to the low-frequency module according to the first control signal; S400: The low-frequency module control circuit receives the user demand instruction and outputs a corresponding second control signal to the low-frequency module. Both the first control signal and the second control signal are digital signals. S500: The low-frequency module outputs a corresponding first pulse signal to the corresponding laser load according to the second control signal and the first voltage signal to drive the laser load.

[0045] Based on the same inventive concept, an embodiment of the present invention further provides a laser, including the laser pulse generation circuit described in any one of the above feature descriptions.

[0046] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "an example" or "a specific example" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0047] The above is only the preferred embodiment of the present invention and does not play any limiting role on the present invention. Any person skilled in the art within the technical field, without departing from the technical solution of the present invention, makes any form of equivalent substitution or modification and other changes to the technical solution and technical content disclosed by the present invention, all of which belong to the content that does not depart from the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A laser pulse generating circuit, characterized in that: include: A general control unit, which is configured to receive user demand instructions and output them to the high-frequency module control circuit and the low-frequency module control circuit. The user demand instructions include the laser load output current ripple signal size, the laser load frequency, pulse width and power; A high-frequency module control circuit, configured to receive the user demand instruction and output a corresponding first control signal to the high-frequency module; a high frequency module, configured to receive power from the power module and output a corresponding first voltage signal to the low frequency module according to the first control signal; A low-frequency module control circuit, configured to receive the user demand instruction and output a corresponding second control signal to the low-frequency module, wherein the first control signal and the second control signal are both digital signals; The low-frequency module is configured to output a corresponding first pulse signal to a corresponding laser load according to the second control signal and the first voltage signal to drive the laser load.

2. The laser pulse generating circuit according to claim 1, characterized in that: The high frequency module includes an interleaved parallel BUCK circuit.

3. The laser pulse generating circuit according to claim 2, characterized in that: The number of the staggered parallel BUCK circuits is multiple groups, and the multiple groups of the staggered parallel BUCK circuits are connected in parallel.

4. The laser pulse generating circuit according to claim 2, characterized in that: Each group of the staggered parallel BUCK circuits includes a first diode, a second diode, a first MOS transistor, a second MOS transistor, a first inductor and a second inductor; The anode of the first diode is electrically connected to the drain of the first MOS transistor at a first connection point, the cathode of the first diode is electrically connected to the positive electrode of the power module and the low-frequency module, the source of the first MOS transistor is electrically connected to the negative electrode of the power module and the low-frequency module, and the first end of the first inductor is electrically connected to the first connection point; The anode of the second diode is electrically connected to the drain of the second MOS transistor at the second connection point, the cathode of the second diode is electrically connected to the positive electrode of the power module and the low-frequency module, the source of the second MOS transistor is electrically connected to the negative electrode of the power module and the low-frequency module, and the first end of the second inductor is electrically connected to the second connection point; The second end of the first inductor is electrically connected to the second end of the second inductor at a third connection point, and the low-frequency module is also electrically connected to the third connection point; The gates of the first MOS transistor and the second MOS transistor are both electrically connected to the high-frequency module control circuit to receive the first control signal.

5. The laser pulse generating circuit according to claim 4, characterized in that: The low-frequency module includes a first IGBT module, a second IGBT module, a third diode and a fourth diode; The collector of the first IGBT module is electrically connected to the cathode of the first diode and the cathode of the fourth diode, and the emitter of the first IGBT module is electrically connected to the third connection point and the cathode of the third diode; The emitter of the second IGBT module is electrically connected to the third connection point, the collector of the second IGBT module is electrically connected to the anode of the fourth diode and the cathode of the laser load, and the cathode of the fourth diode is also electrically connected to the anode of the laser load; The gates of the first IGBT module and the second IGBT are both electrically connected to the low-frequency module control circuit to receive the second control signal.

6. The laser pulse generating circuit according to claim 5, characterized in that: When the first IGBT module is in an on state and the second IGBT module is in an off state, staggered PWM signals are simultaneously applied to the gates of the first MOS transistor and the second MOS transistor to charge the first inductor and the second inductor.

7. The laser pulse generating circuit according to claim 6, characterized in that: When the first IGBT module is in the off state and the second IGBT module is in the on state, before both the first MOS tube and the second MOS tube are in the on state, the laser load is powered by the first diode and the second diode.

8. The laser pulse generating circuit according to claim 7, characterized in that: When the first IGBT module, the second IGBT module, the first MOS tube, and the second MOS tube are all in the off state, the current stored in the first inductor and the second inductor flows back to the power module through the first diode and the second diode.

9. The laser pulse generating circuit according to claim 1, wherein: The overall control unit, the high-frequency module control circuit and the low-frequency module control circuit are all implemented using a DSP chip.

10. The laser pulse generating circuit according to claim 11, characterized in that: The laser pulse generating circuit further includes a protection circuit, which is electrically connected to the high-frequency module and the low-frequency module and is used to provide overcurrent and high-temperature protection to the high-frequency module and the low-frequency module.

11. A laser pulse generation method, characterized in that: The method comprises: The general control unit receives user demand instructions and outputs them to the high-frequency module control circuit and the low-frequency module control circuit. The user demand instructions include the laser load output current ripple signal size, the laser load frequency, pulse width and power; The high-frequency module control circuit receives the user demand instruction and outputs a corresponding first control signal to the high-frequency module, wherein the user demand instruction includes the frequency and pulse width of the laser load; The high-frequency module receives power from the power module, and outputs a corresponding first voltage signal to the low-frequency module according to the first control signal; The low-frequency module control circuit receives the user demand instruction and outputs a corresponding second control signal to the low-frequency module, wherein the first control signal and the second control signal are both digital signals; The low-frequency module outputs a corresponding first pulse signal to a corresponding laser load according to the second control signal and the first voltage signal to drive the laser load.

12. A laser, characterized in that: The laser pulse generating circuit comprises the laser pulse generating circuit according to any one of claims 1 to 10.

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