A pulsed laser driver power supply circuit and apparatus

Abstract

The application belongs to the technical field of pulse laser driver, and specifically discloses a pulse laser driver power supply circuit and equipment. The application realizes input filtering and under-voltage detection through a protection filtering module, sends a signal to a control module in an abnormal condition, and guarantees voltage stability from the source. A driving module is in one-to-one correspondence with a pump, modular independent power supply is realized, and the complexity of centralized driving is eliminated. A voltage reduction unit in each module adapts to the pump voltage, a constant current unit outputs accurate constant current under the control signal, and mutual interference of each channel is ensured. After the control module receives the under-voltage signal, each constant current drive is sequentially cut off in time sequence, and current impact caused by simultaneous shutdown is avoided. Compared with the prior art, the scheme optimizes the architecture and divides the modules, improves the integration, enhances the stability and safety of the system, and significantly improves the overall reliability of the driving power supply.

Description

Technical Field

[0001] This application belongs to the field of pulsed laser driving technology, specifically relating to a pulsed laser driving power supply circuit and device. Background Technology

[0002] As an important branch of fiber lasers, pulsed lasers have developed rapidly in recent years in precision machining fields such as marking and grinding. The driving power supply of pulsed lasers, as the main electrical unit of the laser, plays an important role in the nanosecond, picosecond, light output speed and transmission frequency of the laser.

[0003] In the design of current pulsed lasers, especially multi-pump drive systems, traditional control architectures face significant engineering challenges. Since each pump source is typically controlled by an independent drive module, the system contains numerous redundant circuit units and complex control wiring. This discrete architecture not only leads to a significant increase in material costs but also constitutes a major physical obstacle to laser miniaturization and integration. The large wiring harness and numerous connector interfaces result in a cumbersome overall layout, complex assembly processes, and potential risks to signal integrity and reliability. Furthermore, the distributed control nodes present core challenges when the system handles complex power modulation and collaborative operation, such as insufficient timing synchronization accuracy and high software scheduling overhead, thus limiting further improvements in overall laser performance and the expansion of application scenarios. Therefore, how to achieve simplification, integration, and intelligence of the control system through architectural innovation has become crucial for driving technological development. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a pulsed laser driver power supply circuit and device, which aims to solve the problem of poor overall reliability of the driver power supply in multi-pump scenarios due to the bloated system architecture and low integration of the existing driver power supply circuit.

[0005] The first aspect of this application relates to a pulsed laser driver power supply circuit, comprising: a protection filter module, multiple driver modules, and a control module; the number of driver modules is the same as the number of pumps; each driver module includes: a step-down unit and a constant current driver unit; the input terminal of the protection filter module is connected to the operating power supply; the first output terminal of the protection filter module is connected to the input terminal of each step-down unit; the second output terminal of the protection filter module is connected to the first input terminal of the control module; the output terminal of each step-down unit is connected to the first input terminal of the constant current driver unit of the same driver module; multiple independent drive output terminals of the control module are respectively connected to the second input terminals of each constant current driver unit; the output terminal of the constant current driver unit is connected to the pump; the protection filter module is configured... Upon receiving an input signal from the operating power supply, the input signal is filtered and a first signal is generated and output to the step-down unit. When the first signal is lower than a preset voltage value, an undervoltage signal is output to the control module. The step-down unit is configured to adjust the first signal to a second signal required for pumping upon receiving the first signal and output it to the constant current drive unit of the same drive module. The constant current drive unit is configured to output a constant current to the pump based on the second signal upon receiving a drive signal from the drive output terminal of the control module. Upon receiving a cutoff signal from the control output terminal of the control module, the constant current output is stopped. The control module is configured to output cutoff signals to multiple constant current drive units sequentially according to a timing sequence upon receiving an undervoltage signal.

[0006] In one embodiment, the protection filtering module includes: an input protection unit, a filtering unit, and an undervoltage monitoring unit; the input terminal of the input protection unit is connected to the operating power supply, and the output terminal of the input protection unit is connected to the input terminal of the filtering unit; the output terminal of the filtering unit is connected to the input terminal of the undervoltage monitoring unit and the input terminal of the step-down unit, respectively, and the output terminal of the undervoltage monitoring unit is connected to the first input terminal of the control module; the input protection unit is configured to output the input signal of the operating power supply to the filtering unit, and simultaneously stop outputting to the filtering unit when the operating power supply is short-circuited or reverse-connected; the filtering unit is configured to filter out common-mode interference and noise of the input signal and generate a first signal to output to the step-down unit and the undervoltage monitoring unit; the undervoltage monitoring unit is configured to output an undervoltage signal to the control module when the first signal is lower than a preset voltage value.

[0007] In one embodiment, the input protection unit includes a fuse, a first diode, and a second diode; the filtering unit includes a common-mode inductor, a filter capacitor, and a first resistor; the first end of the fuse is connected to the operating power supply, and the second end of the fuse is connected to the first end of the common-mode inductor and the cathode of the first diode; the anode of the first diode is connected to the second end of the common-mode inductor and the anode of the second diode, and the cathode of the second diode is connected to the operating power supply via a connector; the third end of the common-mode inductor is connected to the first end of the filter capacitor, the input terminal of the step-down unit, and the input terminal of the undervoltage monitoring unit, and the fourth end of the common-mode inductor is connected to the second end of the filter capacitor; the first end of the filter capacitor is also grounded; the first resistor is connected in parallel with the filter capacitor.

[0008] In one embodiment, the undervoltage monitoring unit includes: a voltage divider network, a follower, and a first comparator; the input of the voltage divider network is connected to the output of the filter unit, and the output of the voltage divider network is connected to the input of the follower; the output of the follower is connected to the first input of the first comparator, and the second input of the first comparator is set to a preset voltage value; the output of the comparator is connected to the first input of the control module.

[0009] In one embodiment, the constant current drive unit includes: a drive locking subunit and an output subunit; a first input terminal of the drive locking subunit is connected to the drive output terminal of the control module, and the output terminal of the drive locking subunit is connected to the drive terminal of the output subunit; the input terminal of the output subunit is connected to the output terminal of the step-down unit, and the output terminal of the output subunit is connected to the pump; the drive locking subunit is configured to turn on the output circuit of the output subunit to output a constant current when it receives a drive signal output by the control module.

[0010] In one embodiment, the drive-lock subunit includes: a current-limiting resistor, a first operational amplifier, and a second operational amplifier; the output subunit includes: a first MOSFET and a sampling resistor; the first end of the current-limiting resistor is connected to the drive output terminal of the control module; the second end of the current-limiting resistor is connected to the first input terminal of the first operational amplifier; the second input terminal of the first operational amplifier is connected to the output terminal of the second operational amplifier; the output terminal of the first operational amplifier is connected to the gate of the first MOSFET; the source of the first MOSFET is connected to the first end of the sampling resistor and the input terminal of the second operational amplifier, respectively; the second end of the sampling resistor is grounded; the drain of the first MOSFET is connected to the second terminal of the pump; the first terminal of the pump is connected to the output terminal of the buck unit.

[0011] In one embodiment, the constant current driving unit further includes: a release driving subunit; the control module is further provided with multiple independent control output terminals corresponding to the input terminals of each release driving subunit; the output terminal of the release driving subunit is connected to the second input terminal of the drive locking subunit; the control module is configured to output a cutoff signal to multiple release driving subunits sequentially through the control output terminal according to the timing when receiving an undervoltage signal; the release driving subunit is configured to restrict the flow of driving signal into the drive locking subunit when receiving a cutoff signal; the release driving subunit includes: a second MOS transistor; the gate of the second MOS transistor is connected to the control output terminal of the control module; the source of the second MOS transistor is grounded; the drain of the second MOS transistor is connected to the second input terminal of the drive locking subunit.

[0012] In one embodiment, the driving module further includes: an overcurrent protection unit; the input terminal of the overcurrent protection unit is connected to the output terminal of the constant current driving unit of the same driving module; the output terminal of the overcurrent protection unit is connected to the second input terminal of the control module; the overcurrent protection unit is configured to generate an overcurrent signal and transmit it to the control module when the constant current is higher than a preset current value; the control module is configured to output a cutoff signal to multiple constant current driving units sequentially according to a timing sequence when it receives the overcurrent signal.

[0013] In one embodiment, the overcurrent protection unit includes: a second comparator, a second diode, and a first transistor; the first input terminal of the second comparator is connected to the output terminal of the constant current drive unit, the collector of the first transistor, and the cathode of the second diode, respectively; the second input terminal of the second comparator is connected to a reference power supply; the output terminal of the second comparator is connected to the second input terminal of the control module; the emitter of the first transistor is grounded; and the base of the first transistor is connected to the reset output terminal of the control module.

[0014] A driving power supply device includes a pulsed laser driving power supply circuit and an interface module, as described in the first aspect; the interface module is configured as an electrical connection interface for the pulsed laser driving power supply circuit.

[0015] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: This application solves the problem of poor overall reliability of existing drive power supply circuits in multi-channel pumping scenarios by employing a protection filter module, multiple drive modules, and a control module.

[0016] Specifically, the protection filter module filters the operating power supply and performs undervoltage detection to ensure stable input signals. It also outputs an undervoltage signal to the control module when voltage abnormalities occur, thus preventing voltage fluctuations from damaging the system. Multiple drive modules, matching the number of pumps, achieve a modular design, avoiding the complexity of a single drive circuit and improving integration and scalability. Each drive module's step-down unit adjusts the filtered signal to the voltage required by the pump, while the constant current drive unit outputs a constant current under the control module's drive signal, ensuring independent and precise drive of each pump and reducing mutual interference. Upon receiving an undervoltage signal, the control module sequentially outputs a cutoff signal to each constant current drive unit according to the timing sequence, preventing current surges or damage that could occur if all pumps were shut down simultaneously.

[0017] Compared with existing technologies, these methods simplify the system architecture and enhance the stability and safety of the power supply through modular division of labor and centralized control, thereby improving the overall reliability of the drive power supply. Attached Figure Description

[0018] Figure 1 This is one of the structural block diagrams of the pulsed laser driver power supply circuit provided in the embodiments of this application; Figure 2 This is a structural block diagram of the protection filtering module provided in the embodiments of this application; Figure 3 This is a circuit topology diagram of the input protection unit and the filtering unit provided in the embodiments of this application; Figure 4 This is a circuit topology diagram of the undervoltage detection unit provided in the embodiments of this application; Figure 5 This is a diagram of the peripheral circuit topology of the buck chip provided in the embodiments of this application; Figure 6 This is a voltage regulator circuit topology diagram of the buck chip provided in the embodiments of this application; Figure 7 This is one of the structural block diagrams of the constant current drive unit provided in the embodiments of this application; Figure 8 This is one of the circuit topologies of the constant current drive unit provided in the embodiments of this application; Figure 9 This is a second structural block diagram of the constant current drive unit provided in the embodiments of this application; Figure 10 This is the second circuit topology diagram of the constant current drive unit provided in the embodiments of this application; Figure 11 This is the second structural block diagram of the pulsed laser driver power supply circuit provided in the embodiments of this application; Figure 12 This is a circuit topology diagram of the overcurrent protection unit provided in the embodiments of this application; Figure 13 This is a schematic diagram of the interface module provided in the embodiments of this application.

[0019] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 10 is the protection filter module; 11 is the input protection unit; 12 is the filter unit; 13 is the undervoltage monitoring unit; 21 is the step-down unit; 22 is the constant current drive unit; 221 is the drive lockout subunit; 222 is the output subunit; 223 is the drive release subunit; 23 is the overcurrent protection unit; 30 is the control module; FU is the fuse; D1 is the first diode; D2 is the second diode; L1 is the common mode inductor; C1 is the filter capacitor; U1 is the follower; U2 is the first comparator; U3 is the first operational amplifier; U4 is the second operational amplifier; Q1 is the first MOSFET; R10 is the sampling resistor; Q2 is the second MOSFET; U5 is the second comparator; D3 is the second diode; T1 is the first transistor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. In this application, the symbol " / " indicates that the related objects are in an "or" relationship, for example, A / B means A or B.

[0022] In this application, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order of objects. For example, "first response message" and "second response message," etc., are used to distinguish different response messages, not to describe a specific order of response messages.

[0023] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0024] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, for example, multiple processing units means two or more processing units, multiple elements means two or more elements, etc.

[0025] Current multi-pump drive systems for pulsed lasers employ a discrete control architecture, resulting in numerous redundant circuits and complex wiring. This not only increases cost and size but also hinders the miniaturization and integration of lasers. The complex wiring and interfaces make the overall structure bulky, difficult to assemble, and introduce risks to signal integrity and reliability. Furthermore, distributed control nodes reduce timing synchronization accuracy, increase software scheduling burden, and limit laser performance improvements and application expansion. Therefore, driving architectural innovation towards simplification, integration, and intelligence in control systems has become a critical requirement.

[0026] Based on this, this application proposes an embodiment of a pulsed laser driver power supply circuit. Please refer to... Figure 1 , Figure 1 This is one of the structural block diagrams of the pulsed laser driver power supply circuit provided in the embodiments of this application.

[0027] In this embodiment, the pulsed laser driving power supply circuit includes: a protection filter module 10, multiple driving modules, and a control module 30. The number of driving modules is the same as the number of pumps; each driving module includes: a step-down unit 21 and a constant current driving unit 22.

[0028] It should be noted that the drive module is a functional subsystem, defined as the sum of the functions of the buck unit 21 and the constant current drive unit 22. This means that the module can be physically a highly integrated single device, or it can be a functional whole composed of the discrete buck unit 21 and the constant current drive unit 22 working together. Its core feature is that it acts as a complete logic unit, providing the required constant current for the pump.

[0029] It is understandable that having the same number of drive modules as the number of pumps means that each pump source is equipped with an independent drive module, forming a one-to-one drive relationship, thereby physically ensuring the independence and consistency between each path. Each drive module, as a complete functional unit, integrates voltage conversion and constant current drive functions, and is connected to the control module 30, the pre-stage protection and filtering module 10, and the load pump through standardized interfaces.

[0030] Furthermore, this application illustrates the connection relationship of the above modules: the input terminal of the protection filter module 10 is connected to the working power supply; the first output terminal of the protection filter module 10 is connected to the input terminal of each step-down unit 21; the second output terminal of the protection filter module 10 is connected to the first input terminal of the control module 30; the output terminal of the step-down unit 21 is connected to the first input terminal of the constant current drive unit 22 of the same drive module; the multiple independent drive output terminals of the control module are respectively connected to the second input terminals of each constant current drive unit; the output terminal of the constant current drive unit 22 is connected to the pump.

[0031] It should be noted that "input terminal" refers to the port where a signal flows in, and "output terminal" refers to the port where a signal flows out. The limitations preceding "input terminal" or "output terminal" in this application, such as "first," "second," and "drive" mentioned above, and "control" and "reset" mentioned below, are merely added descriptions to distinguish between different ports within the same module and do not impose any functional constraints. Furthermore, the absence of descriptive terms preceding "input terminal" or "output terminal" generally means that the module or unit only requires one input terminal or output terminal to achieve its function; whether other usable ports exist is not considered in this application.

[0032] In particular, the multiple independent drive outputs and the multiple independent control outputs mentioned below in this application are because there may be multiple drive modules, all connected through this type of port. Although they are different ports, to avoid redundancy, they are uniformly referred to as having "multiple independent" "drive outputs", "control outputs", or "second inputs", and will not be numbered or described further.

[0033] It is understood that the connection in this application can be a direct circuit connection or a signal transmission through a communication protocol, and no limitation is made here.

[0034] Understandably, the output of the external power supply is first connected to the input terminal of the protection filter module 10 to filter the input signal of the external power supply, keeping the signal pure at the input terminal and reducing the influence of the constant current output in the subsequent process. The module then distributes the filtered input signal, i.e., the first signal, in parallel to the step-down units 21 in all drive modules through the first output terminal, and at the same time feeds back the status of the first signal to the first input terminal of the control module 30 through the second output terminal.

[0035] It is understandable that monitoring the state of the first signal is of great importance. This is because the first signal is the input to the drive module; any change in this signal due to circuit faults or other possible factors will impact the entire system. Specifically, this feedback can involve comparing the first signal with a preset specific range and providing the comparison result to determine if a large fluctuation has occurred. This is because, assuming the operating power supply is known, the state of the first signal is predictable, and this predictable range can be set as a preset specific range. Within this range, the state of the first signal is normal.

[0036] Similarly, for this reason, it is necessary to protect this part of the input process in advance to avoid fluctuations in the filtered input signal. Therefore, in addition to filtering and monitoring, short-circuit protection and reverse connection protection can be added, which will not be elaborated here.

[0037] It should be noted that in practical applications, the available power supply and the operating voltage required by the constant current drive unit 22 are generally incompatible. Even if a compatibility exists, the required operating voltage will differ depending on the number of pumps. Therefore, the voltage needs to be adjusted specifically by the step-down unit 21. Within each drive module, the step-down unit 21 converts the first signal received from its own input terminal into the operating voltage required by the constant current drive unit 22 in the same module, which is the second signal, and directly sends it to the first input terminal of the constant current drive unit 22 through its own output terminal to complete energy processing. The implementation of step-down is quite mature at present and will not be limited here.

[0038] Understandably, the control module 30 sends drive signals to the second input of all constant current drive units 22 through its multiple independent drive outputs to control the constant current drive units 22 to start working, and ultimately each constant current drive unit 22 independently drives its corresponding pump load. This connection structure realizes centralized power management, distributed voltage conversion, and centralized control and independent regulation of pump drive.

[0039] It should be noted that the drive signal is only used to instruct the constant current drive unit 22 to start working; therefore, the drive signal can be any signal that can be responded to by the constant current drive unit 22. For example, if the constant current drive unit 22 operates by turning a MOSFET on or off, the control module 30 needs to output a high level to the gate of the MOSFET to trigger its operation. Therefore, there are various ways to generate the drive signal based on different devices, which will not be listed here.

[0040] It is understandable that the triggering of the drive signal can be achieved by the control module 30 responding to computer instructions or by manual button presses. For example, the control module 30 may have a program stored internally that causes it to automatically or according to predetermined logic, such as timing or feedback from external sensors, to issue drive signals. Whether additional ports are needed to implement this triggering function is not limited here. Therefore, the control module 30 is a controller capable of generating multiple synchronous or asynchronous switching signals on demand, and this function can be achieved using either a microcontroller or a programmable logic device.

[0041] It should be noted that the constant current drive unit 22 is configured to output a constant current to the pump based on the second signal when it receives the drive signal output by the control module 30; and to stop outputting the constant current when it receives the cutoff signal output by the control module 30.

[0042] Understandably, upon receiving the drive signal, the first input terminal of the constant current drive unit 22 receives the second signal output from the output terminal of the buck unit 21 in the same drive module. Outputting a constant current based on the second signal essentially consumes the energy in the second signal to generate a preset, extremely stable constant current, which is then output to the pump load. This is the core requirement for laser pumping. Since this constant current actually consumes the energy of the second signal, it is inevitably limited by the second signal.

[0043] Understandably, regardless of changes in its own characteristics or slight voltage fluctuations, a constant current source can ensure that the current flowing through the pump is precisely stable, thereby guaranteeing the stability and reliability of the light power emitted by the pump. Therefore, the constant current drive unit 22 also needs to have a feedback loop.

[0044] Understandably, in the specific implementation, the above-described working mode is the driving mode of the constant current drive unit 22. In summary, the driving mode is that when the constant current drive unit 22 receives a drive signal from the drive output terminal of the control module 30 from its second input terminal, it starts working and outputs a preset, constant drive current to the pump connected to it based on the voltage energy provided by the second signal.

[0045] Understandably, if there is a working mode, there is also a cutoff mode. The cutoff mode is how the constant current drive unit 22 exits the working mode. The cutoff mode also requires a signal to indicate it; that is, the cutoff signal.

[0046] In this embodiment, the drive output terminal of the control module 30 can also stop sending drive signals and instead send a cutoff signal to the second input terminal of the constant current drive unit 22. When the constant current drive unit 22 receives the cutoff signal from the control module 30, it immediately cuts off the current flowing to the pump, causing it to stop working. This cutoff signal is the opposite of the drive signal mentioned above, used to instruct the constant current drive unit 22 to stop working. Similarly, taking a MOSFET as an example, the control module 30 outputting a high impedance or a low level to the gate of the MOSFET will trigger the MOSFET to turn off, thus stopping its operation.

[0047] It is understandable that the cutoff signal can also be triggered by the control module 30 responding to computer instructions or by a manual button press. When the entire system is not required to work, the cutoff signal can be triggered to achieve manual shutdown.

[0048] In addition, the triggering of the cutoff signal can also be programmatic. For example, when the first signal is undervoltage, the second signal will also naturally be undervoltage, unable to supply the constant current drive unit 22, thus necessitating the entry into cutoff mode. Therefore, based on the above, this undervoltage can be achieved by the protection filter module 10 monitoring the state of the first signal. When the protection filter module 10 detects that the first signal is undervoltage (below a preset voltage value), it outputs an undervoltage signal through its second output terminal to the first input terminal of the control module 30. The control module 30, based on its internal program, recognizes the undervoltage of the first signal and needs to enter cutoff mode, thereby outputting a cutoff signal through the drive output terminal. Other cases are not discussed here; only the current function needs to be implemented.

[0049] It is understandable that, given the presence of multiple driver modules, the timing of the cutoff signal output should take into account the pump characteristics and be output sequentially to achieve sequential shutdown. How to achieve sequential shutdown depends on the internal program content; existing solutions can be used, and this application does not impose any limitations.

[0050] In this embodiment, by employing a protection filter module, multiple drive modules, and a control module, the problem of poor overall reliability caused by the bloated system architecture and low integration of existing drive power supply circuits in multi-channel pumping scenarios is solved.

[0051] Specifically, the protection filter module filters the operating power supply and performs undervoltage detection to ensure stable input signals. It also outputs an undervoltage signal to the control module when voltage abnormalities occur, thus preventing voltage fluctuations from damaging the system. Multiple drive modules, matching the number of pumps, achieve a modular design, avoiding the complexity of a single drive circuit and improving integration and scalability. Each drive module's step-down unit adjusts the filtered signal to the voltage required by the pump, while the constant current drive unit outputs a constant current under the control module's drive signal, ensuring independent and precise drive of each pump and reducing mutual interference. Upon receiving an undervoltage signal, the control module sequentially outputs a cutoff signal to each constant current drive unit according to the timing sequence, preventing current surges or damage that could occur if all pumps were shut down simultaneously.

[0052] Compared with existing technologies, these methods simplify the system architecture and enhance the stability and safety of the power supply through modular division of labor and centralized control, thereby improving the overall reliability of the drive power supply.

[0053] Furthermore, this application provides specific limitations on the protection filter module 10. Please refer to... Figure 2 , Figure 2 This is a structural block diagram of the protection filtering module provided in the embodiments of this application.

[0054] It is understandable that the protection filter module 10, as the starting point of the entire circuit, integrates the three functions mentioned above: filtering, protection, and monitoring. Therefore, in this embodiment, the protection filter module 10 includes: an input protection unit 11, a filtering unit 12, and an undervoltage monitoring unit 13.

[0055] The input terminal of the input protection unit 11 is connected to the working power supply, and the output terminal of the input protection unit 11 is connected to the input terminal of the filter unit 12. The output terminal of the filter unit 12 is connected to the input terminal of the undervoltage monitoring unit 13 and the input terminal of the step-down unit 21, respectively. The output terminal of the undervoltage monitoring unit 13 is connected to the first input terminal of the control module 30.

[0056] It is understandable that the input protection unit 11, as the first stage of the module, has its input terminal being the input terminal of the protection filter module 10, directly connected to the external power supply, responsible for primary protection. The filter unit 12, as the second stage, has its input terminal connected to the output terminal of the input protection unit 11, responsible for signal purification; the output terminal of the filter unit 12 is the first output terminal of the protection filter module 10, connected to the input terminal of the subsequent step-down unit 21. The undervoltage monitoring unit 13, as a monitoring branch, also has its input terminal connected to the output terminal of the filter unit 12, real-time acquiring and monitoring the voltage status of the first signal, and feeding it back to the first input terminal of the control module 30 through its output terminal, which is the second output terminal of the protection filter module 10. It should be noted that the input protection unit 11 is configured to output the input signal of the power supply to the filter unit 12, and simultaneously stop outputting to the filter unit 12 when the power supply is short-circuited or reverse-connected. The filter unit 12 is configured to filter out common-mode interference and noise from the input signal and generate the first signal, which is then output to the step-down unit 21 and the undervoltage monitoring unit 13. The undervoltage monitoring unit 13 is configured to output an undervoltage signal to the control module 30 when the first signal is lower than a preset voltage value.

[0057] It is understandable that the input protection unit 11 is a safety barrier for the circuit. Its main functions are twofold: When the circuit is normally powered on (i.e., the power supply is normal), it transmits the operating power signal to the subsequent filtering unit 12 with no or low loss. When a serious fault such as a short circuit or reverse connection is detected in the operating power supply, this unit will immediately activate, stopping the output to the filtering unit 12, thereby cutting off the power supply to all subsequent circuits, preventing the fault from escalating, and protecting core components from damage. For example, in one specific implementation, this unit may typically include one or more combinations of components such as a fuse, a reverse connection protection diode, and a Zener diode. Specifically, when the power supply is accidentally reverse-connected, the reverse cutoff characteristic of the diode can prevent the circuit from operating; when a serious short circuit occurs at the input, the fuse will blow, physically disconnecting the circuit; and the Zener diode can maintain the input voltage within a stable range, protecting the subsequent circuits.

[0058] Understandably, filter unit 12 is responsible for filtering out common-mode interference, electromagnetic noise, and voltage spikes from the input power supply. After processing, it outputs a stable and smooth DC voltage, i.e., the first signal. This unit typically consists of a common-mode inductor and filter capacitors. For example, it can convert a 24V input with high-frequency switching noise into a clean and stable 24V DC voltage.

[0059] Specifically, this application provides a feasible implementation method for a protection filtering module. Please refer to... Figure 3 , Figure 3 This is a circuit topology diagram of the input protection unit and the filtering unit provided in the embodiments of this application.

[0060] In this embodiment, the input protection unit 11 may include: a fuse FU, a first diode D1, and a second diode D2. The filtering unit 12 includes: a common-mode inductor L1, a filter capacitor C1, and a first resistor R1.

[0061] The first terminal of fuse FU, which is the VIN port in the diagram, serves as the input to the power supply of the input protection unit 11. Figure 3 The power supply is connected via connector J19 to the positive terminal (not shown). The second terminal of fuse FU is connected to the first terminal of common-mode inductor L1 and the cathode of first diode D1. The anode of first diode D1 is connected to the second terminal of common-mode inductor L1 and the anode of second diode D2. The cathode of second diode D2 is connected to the negative terminal of the operating power supply via connector J19. The third terminal of common-mode inductor L1 is connected to the first terminal of filter capacitor C1, and the fourth terminal of common-mode inductor L1 is connected to the second terminal of filter capacitor C1. The first terminal of filter capacitor C1 is also grounded. The first resistor R1 is connected in parallel with filter capacitor C1.

[0062] It is understandable that the first and second terminals of the common-mode inductor L1 are the output terminals of the input protection unit 11 and the input terminals of the filter unit 12. The first terminal of the filter capacitor is the output terminal of the filter unit 12, and also the input terminal of the undervoltage monitoring unit 13, which is named the VIN1 port in the figure.

[0063] Understandably, fuse FU provides overcurrent protection. When a short circuit occurs or the current exceeds the limit, fuse FU will melt due to overheating, physically cutting off the main power supply circuit and preventing the fault from escalating. Diode D1 acts as a voltage regulator, maintaining the input voltage at a stable level. When the voltage exceeds its breakdown value, diode D1 will quickly undergo Zener breakdown, clamping the voltage to a safe value. Simultaneously, a large current will be generated, which will also conduct to fuse FU, causing it to melt and thus achieving overvoltage protection. Diode D2 prevents reverse connection to the input terminal. When the power supply is reversed, diode D2 will be in a reverse cutoff state, and the circuit will not function properly.

[0064] Understandably, the common-mode inductor L1 exhibits high impedance to common-mode interference, effectively suppressing high-frequency electromagnetic interference from the power grid or space. Simultaneously, it also suppresses differential-mode interference to some extent. The filter capacitor C1 filters out differential-mode interference and stabilizes the voltage, providing a low-ripple, stable first signal for subsequent circuits. The first resistor R1 acts as a dummy load when the circuit is unloaded, limiting the current below the device's rated current, thus serving a current-limiting function.

[0065] Understandably, in Figure 3 The input signal of the operating power supply is input from the VIN port, filtered into a first signal, and output from the VIN1 port. The undervoltage monitoring unit 13 is mainly used to compare the voltage value of the first signal obtained from the VIN1 port with an internally preset threshold voltage to monitor whether there is an undervoltage condition. When the voltage is detected to be lower than this preset value, it determines that the system power supply is insufficient and then outputs an undervoltage signal to the control module 30. This unit can be a voltage monitoring chip or a circuit composed of a voltage reference source and a comparator. For example, when the input voltage drops to 15V due to an external fault, the unit will immediately send a signal that transitions from a low level to a high level, i.e., an undervoltage signal, to the control module from its output terminal. If there is no undervoltage, it will remain at a low level.

[0066] Specifically, please refer to Figure 4 , Figure 4 This is a circuit topology diagram of the undervoltage detection unit provided in an embodiment of this application. The undervoltage monitoring unit 13 may include: a voltage divider network, a follower U1, and a first comparator U2; the input terminal of the voltage divider network is connected to the output terminal of the filter unit 12, which is... Figure 4 The output of the voltage divider network is connected to the input of the follower U1 via the VIN1 port. The output of the follower U1 is connected to the first input of the first comparator U2, and the second input of the first comparator U2 is set to a preset voltage value. The output of the first comparator U2 is connected to the first input of the control module 30, which is the Condition port in the figure.

[0067] Understandably, the voltage divider network, consisting of the second resistor R2 and the third resistor R3 connected in series, samples the first signal and scales it proportionally. The 3.3V signal is clamped by the pull-up diode, resulting in a sampling voltage lower than 3.3V. This sampling voltage is then fed into the positive input of the follower U1. The follower U1 acts as a buffer with high input impedance and low output impedance, ensuring accurate reading of the voltage divider network without causing a load effect, thus guaranteeing sampling accuracy.

[0068] Understandably, the buffered voltage output from follower U1, equal to the sampled voltage, is fed into the first input of the first comparator U2. Simultaneously, a stable preset voltage value is applied to the second input of the first comparator U2. The comparator compares these two voltages in real time and outputs a signal that controls the subsequent pull-up network (3.3V, third resistor R3, and fourth resistor R4) to output high or low levels to distinguish whether an undervoltage state is present. This high or low level is output through the Condition port in the diagram. A high level signal at the Condition port indicates an undervoltage state.

[0069] Understandably, there is no overvoltage condition under this circuit structure because the first signal is actually limited by the operating power supply and therefore cannot exceed the input of the operating power supply. Whether it's a short circuit, overcurrent, or a reverse connection causing the loop to break, the entire protection filter module 10 will result in an undervoltage condition for the first signal output from the VIN1 port. Therefore, the focus should be on the undervoltage condition. A sampled signal higher than this preset voltage value is normal; the Condition port will output a low level, indicating that the first signal is in a normal state.

[0070] Specifically, this embodiment provides a specific implementation of a step-down unit 21. The step-down unit 21 consists of a step-down chip, peripheral circuitry, and a voltage regulator circuit.

[0071] Please refer to Figure 5 , Figure 5 This is a diagram of the peripheral circuit topology of the buck chip provided in the embodiments of this application. Figure 5 This is a classic peripheral circuit for the LM5145 step-down chip. For example, constant current drive requires 3V. The output voltage from the VOUT port is acquired, and the output voltage is adjusted by regulating the feedback resistor network composed of resistors R6 (sixth), R7 (seventh), and R8 (eighth). The switching transistors Q11 and Q22 are controlled by the HO and LO pins of the step-down chip, respectively, and the switching frequency is determined by resistor R9 (ninth). Finally, the voltage converted by the duty cycle of switching transistors Q11 and Q22 from the first signal output from the VIN1 port of the filter unit 12 is output from the VOUT port.

[0072] Please refer to Figure 6 , Figure 6This is a voltage regulator circuit topology diagram of the buck chip provided in this application embodiment. The second inductor L2, the second capacitor C2, and the third capacitor C3 constitute an LC voltage regulator circuit, which also serves to eliminate output voltage ripple and ensure a stable output voltage of 3V, i.e., the final second signal, which is output from the VOUT1 port.

[0073] Specifically, this embodiment provides a specific implementation of a constant current drive unit 22. Please refer to... Figure 7 , Figure 7 This is one of the structural block diagrams of the constant current drive unit provided in the embodiments of this application.

[0074] In this embodiment, the constant current driving unit 22 includes a driving locking subunit 221 and an output subunit 222.

[0075] The first input terminal of the drive locking subunit 221, which is also the second input terminal of the entire constant current drive unit 22, is connected to the drive output terminal of the control module 30. The output terminal of the drive locking subunit 221 is connected to the drive terminal of the output subunit 222. The input terminal of the output subunit 222 is connected to the output terminal of the step-down unit 21. The output terminal of the output subunit 222, which is also the output terminal of the entire constant current drive unit 22, is connected to the pump.

[0076] It should be noted that the first input terminal of the drive locking subunit 221 is connected to the drive output terminal of the control module 30 to receive the global drive signal or cutoff signal. The output terminal of the drive locking subunit 221 is connected to the drive terminal of the output subunit 222. The output subunit 222 serves as an energy conversion and output mechanism. The input terminal of the output subunit 222 is connected to the output terminal of the step-down unit 21 to receive the second signal VIN2 required for pumping. The output terminal is directly connected to the pump to provide it with a constant drive current.

[0077] It should be noted that the output subunit 222 is controlled by the drive-lock subunit 221. After receiving the drive signal, the drive-lock subunit 221 converts it into a conduction signal, which can control the on / off state of the power circuit inside the output subunit 222. Similarly, the conduction signal can be implemented in any form that can be responded to by the output subunit 222, just like the drive signal and the cutoff signal, and will not be elaborated here.

[0078] Understandably, the drive locking subunit 221 is configured to turn on the output circuit of the output subunit 222 to output a constant current under the second signal when it receives the drive signal output by the control module 30; the output subunit 222 is configured to output a constant current to the pump based on the second signal when the output circuit is turned on.

[0079] Specifically, please refer to Figure 8The drive locking subunit 221 includes: a current limiting resistor R10, a first operational amplifier U3 and a second operational amplifier U4; the output subunit includes: a first MOS transistor Q1 and a sampling resistor R11.

[0080] It should be noted that the first end of the current-limiting resistor R10, which is also the first input end of the drive locking subunit 221, is connected to the drive output end of the control module via the DA1 port in the figure; the second end of the current-limiting resistor R10 is connected to the first input end of the first operational amplifier U3; the second input end of the first operational amplifier U3 is connected to the output end of the second operational amplifier U4; the output end of the first operational amplifier U3 is connected to the gate of the first MOS transistor Q1; the source of the first MOS transistor Q1 is connected to the first end of the sampling resistor R11 and the input end of the second operational amplifier U4 respectively; the second end of the sampling resistor R11 is grounded; the drain of the first MOS transistor Q1 is connected to the second end of the pump via the LD- port; the first end of the pump is connected to the output end of the buck unit 21, i.e., the VOUT1 port, via the LD+ port.

[0081] Understandably, the current-limiting resistor R10 is used to prevent the input impedance of the drive signal from being too low, which could cause a large current surge to the first operational amplifier U3. The first input terminal of the first operational amplifier U3 is connected to the drive output terminal of the control module 30 to receive the drive signal; the second input terminal of the first operational amplifier U3 is connected to the output terminal of the second operational amplifier U4 to receive the feedback signal; the output terminal of the first operational amplifier U3 directly controls the gate of the first MOSFET Q1. The second operational amplifier U4 forms a negative feedback network, with its input terminal connected to the first terminal of the sampling resistor R11 for voltage monitoring.

[0082] Understandably, the gate of the first MOSFET Q1 is controlled by the first operational amplifier U3, its source is connected to the sampling resistor R11, its drain is connected to the pump negative terminal LD-, and its pump positive terminal LD+ is directly connected to the VOUT1 port that outputs the second signal; the first MOSFET Q1 is the current output actuator. The sampling resistor R11 is connected in series in the power circuit to convert the output current into a voltage signal for feedback.

[0083] Understandably, when the control module 30 sends a drive signal to the constant current drive unit 22 of the first drive module through the drive control terminal, namely the DA1 port, the first operational amplifier U3 will output a high level to drive the first MOS transistor Q1 to conduct. At this time, the output sub-unit 220 establishes a loop and generates current. The sampling resistor R10 converts the current signal into a voltage signal and outputs it from the Ioutdisp1 port. Then, the voltage signal output from the Ioutdisp1 port is amplified by the amplification circuit composed of the second operational amplifier U4 and compared with the signal of the DA1 port to form a negative feedback circuit. This makes the conduction degree of the gate drive voltage of the first MOS transistor Q1 constant under the control of the DA1 terminal signal, and the constant current drive outputs a constant current.

[0084] Similarly, the port of the drive signal sent to the constant current drive unit 22 of the second drive module (not shown in the figure) is the DA2 port, and the port of the drive signal sent to the constant current drive unit 22 of the third drive module is the DA3 port.

[0085] It is understood that the specific workflow of this embodiment is as follows: the working power supply is input from the VIN port, and after passing through the input protection unit 11 and the filtering unit 12, it is converted into a first signal and output to the step-down unit 21 through the VIN1 port. The step-down unit 21 then converts the first signal into a second signal and outputs it to the output subunit 222 through the VOUT1 port to provide energy supply.

[0086] In drive mode, the control module 30 outputs a drive signal to the first drive via the DA1 port, causing the drive locking subunit 221 and the output subunit 222 to start working. A constant current is transmitted through the connection of the pump's positive and negative terminals LD+ and LD- to drive the pump. In cutoff mode, the control module 30 outputs a cutoff signal to the first drive via the DA1 port, causing the drive locking subunit 221 and the output subunit 222 to stop working and cease driving the pump.

[0087] Understandably, the subsequent multi-channel driver module works similarly, except that it will output drive signals for ports such as DA2 and DA3. The timing of the signals output from different DA ports can be implemented by an internally designed program.

[0088] It should be noted that, in order to separate the driving and protection functions, this application proposes an improved second embodiment based on the above embodiments, namely... Figure 7 The constant current drive unit 22 may also include a deactivation subunit 223 to independently stop the drive. Please refer to [reference needed] for details. Figure 9 , Figure 9 This is the second structural block diagram of the constant current drive unit provided in the embodiments of this application.

[0089] The control module also includes multiple independent control output terminals that are connected to the input terminals of each of the release drive subunits. The output terminal of the release drive subunit 223 is connected to the second input terminal of the drive lock subunit 221.

[0090] It should be noted that when the undervoltage signal is received, the control module 30 is configured to no longer output a cutoff signal through the drive control terminal, but instead outputs a cutoff signal to multiple release drive subunits 223 in sequence according to the timing of the control output terminal; the release drive subunit 223 is configured to restrict the flow of drive signal into the drive locking subunit 221 when it receives the cutoff signal output by the control module 30.

[0091] It is understandable that, in this embodiment, a separate control output terminal is provided for the cutoff signal output. Compared to outputting it at the original drive output terminal, this achieves independent hardware paths for drive and protection, ensuring that they do not interfere with each other. Even if the drive control logic malfunctions, the independent protection channel can still operate reliably, ensuring system safety. Among these features, the release drive subunit 223 is a key configuration.

[0092] Specifically, please refer to Figure 10 The red box indicates that the release drive subunit 223 includes: a second MOSFET Q2; the gate of the second MOSFET Q2 is connected to the control output terminal of the control module 30, which is the EN1 port; the source of the second MOSFET Q2 is grounded; and the drain of the second MOSFET Q2 is connected to the second input terminal of the drive lock subunit 221, which is the second end of the current limiting resistor R10.

[0093] Understandably, during normal drive operation, the control module 30 outputs a low-level signal to the gate of the second MOSFET Q2 via the control output terminal EN1. Turning off the second MOSFET Q2 does not affect the drive. When it is necessary to stop the drive, the control module 30 outputs a high-level cutoff signal to the gate of the second MOSFET Q2. This grounds the second MOSFET Q2, effectively pulling the input signal of the drive locking subunit 221 low to ground, thus stopping the drive. For specific implementation details, please refer to... Figure 8 The voltage divider network in the middle is used to select whether to provide a high or low level.

[0094] It is understood that the port of the cutoff signal sent to the second drive module's cutoff subunit 223 (not shown in the figure) is EN2, and the port of the cutoff signal sent to the third drive module's cutoff subunit 223 is EN3.

[0095] In drive mode, drive locking subunit 221 receives a drive signal from DA1 port and controls output subunit 222 to start working. Based on the voltage energy provided by the second signal, a preset, constant drive current is output to the pump connected to it. In cutoff mode, when drive subunit 223 receives a high-level signal from EN1 port, the drain and source of MOSFET Q2 are turned on, the signal at DA1 port is pulled low, and the drive unit stops working.

[0096] It should be noted that the control module 30 is configured to sequentially output cutoff signals to multiple constant current drive units 22 according to a timing sequence upon receiving an undervoltage signal. The triggering of the control module 30's behavior depends on the undervoltage signal from the protection filter module 10. This signal is an alarm indicating a fault in the system input power supply, with the voltage falling below the minimum requirement for safe operation. Therefore, the control module 30 responds by sending cutoff signals to all constant current drive units 22; the two forms described above will not be elaborated here. The cutoff signal commands the constant current drive units 22 to immediately stop outputting current, thereby stopping all pumps from operating. The purpose is to protect the delicate pumps and the entire circuit system from damage under abnormal power supply conditions.

[0097] Understandably, sequential shutdown does not mean controlling all units to shut down simultaneously, but rather shutting them down one by one according to a preset, fixed time sequence. If all high-power pump drives were to shut down instantaneously, the resulting huge back electromotive force and current changes could generate severe voltage spikes and interference on the power bus, potentially damaging other circuit components. Ordered shutdown disperses the instantaneous shutdown process of a large current into multiple sequential shutdowns of smaller currents, greatly reducing the electrical stress on the upstream protection filter modules and the common power bus. This soft shutdown method is smoother and gentler than hard shutdown, improving the system's reliability and lifespan under abnormal conditions.

[0098] In addition to the above embodiments, the potential overcurrent state during constant current driving should also be considered and protected against. This application proposes a third embodiment. Please refer to... Figure 11 , Figure 11 This is the second structural block diagram of the pulsed laser driver power supply circuit provided in the embodiments of this application.

[0099] In this embodiment, the driving module further includes an overcurrent protection unit 23. The input terminal of the overcurrent protection unit 23 is connected to the output terminal of the constant current driving unit 22 within the same driving module; the output terminal of the overcurrent protection unit 23 is connected to the second input terminal of the control module 30.

[0100] It should be noted that, Figure 11For clarity, other possible driver modules have been omitted. In practical applications, the control module 30 should have multiple second input terminals to handle the overcurrent feedback requirements of multiple driver modules.

[0101] Understandably, this means that each drive module integrates an overcurrent protection unit 23 specifically for monitoring the output current of its corresponding constant current drive unit 22. This independent monitoring design ensures timely and accurate protection. The input of the overcurrent protection unit 23 is connected to the output of the constant current drive unit 22 within the same drive module, directly sampling the current flowing through the pump. Its output is connected to the second input of the control module 30 for reporting overcurrent faults.

[0102] It should be noted that the overcurrent protection unit 23 is configured to continuously monitor the output current of the constant current drive unit 22. When the constant output current is higher than the preset current value, it indicates that an abnormal overcurrent has occurred in the drive, generates an overcurrent signal and transmits it to the control module 30. The control module 30 is also configured to output a cutoff signal to multiple constant current drive units 22 in sequence according to the timing when it receives the overcurrent signal.

[0103] Specifically, please refer to Figure 12 , Figure 12 This is a circuit topology diagram of the overcurrent protection unit provided in the embodiments of this application.

[0104] It should be noted that the overcurrent protection unit 23 includes: a second comparator U5, a second diode D3, and a first transistor T1; the first input terminal of the second comparator U5 is connected to the output terminal of the constant current drive unit 22, the collector of the first transistor T1, and the cathode of the second diode D3, respectively; the second input terminal of the second comparator U5 is connected to the reference power supply; the output terminal of the second comparator U5 is also connected to the second input terminal of the control module 30, i.e., the Condition1 port in the figure; the emitter of the first transistor T1 is grounded; the base of the first transistor T1 is connected to the reset output terminal of the control module 30, i.e., the RESET port in the figure.

[0105] Understandably, the second input terminal of the control module 30 should also have multiple input terminals to identify the overcurrent conditions of different drive modules. The reset output terminal of the control module 30 can be summarized into a single RESERT port, simultaneously controlling multiple overcurrent protection units 23 to reset their initial states. Understandably, the second comparator U5, as the core detection and judgment element, compares the real-time current signal with a reference value. The second diode D3 acts as a positive feedback element, achieving state self-locking. The first transistor T1 is a reset switch, controlled by the control module, used to clear the locked state.

[0106] It should be noted that the first input terminal of the second comparator U5 is also the input terminal of the overcurrent protection unit 23, and should be connected to the output terminal of the constant current drive module. The IS_OUT1 port is selected in this diagram because the signal output from the IS_OUT1 port is a voltage signal that has been converted from the current signal by the Ioutdisp1 port and appropriately amplified by the second operational amplifier U4, thus better reflecting the current status of the output subunit 222.

[0107] Understandably, after receiving the voltage signal from the IS_OUT1 port, it is compared with the reference power supply VREF via the second comparator U5. If the level at the IS_OUT1 port of the first constant current drive unit 22 is higher than the reference power supply VREF, the output of the second comparator U5 is in a high-impedance state. The 3.3V voltage forms a latching circuit through the pull-up resistor and the second diode D3, locking the Condition1 port at a high level. Finally, the high level is transmitted to the control module 30 through the Condition1 port, and the control module 30 knows that an overcurrent condition has occurred in the first drive module.

[0108] Understandably, when the circuit is corrected and the control module 30 outputs a high-level reset signal from the RESET port, the collector and emitter of the first transistor T1 are turned on, the level of the IS_OUT1 port is pulled low, the level of the inverting input of the second comparator is greater than that of the non-inverting input, and the Condition1 port is set low to reset.

[0109] Understandably, the multi-channel overcurrent protection unit 23 feeds back the current status of the constant current drive unit 22 to multiple second input terminals of the control module 30 through the interface circuit. After receiving the signal, the control module 30 controls the three drives to shut down in sequence. Similarly, the current status of the second constant current drive unit 22 is received by the Condition2 port; the current status of the third constant current drive unit 22 is received by the Condition3 port.

[0110] In this embodiment, the system now possesses dual safety guarantees: input-side undervoltage protection and output-side overcurrent protection, significantly improving reliability. Whether the problem is related to power supply or load, it is ultimately handled through a unified and orderly timing shutdown process, simplifying the system state machine design and avoiding current surges during shutdown. Simultaneously, since each driver module has independent overcurrent detection, the control module can pinpoint the specific path experiencing an overcurrent fault through polling or different signal codes, facilitating subsequent diagnosis and maintenance. By integrating overcurrent protection units into the driver modules and having them work collaboratively with the control module, a comprehensive protection system with rapid response and reliable operation is constructed, suitable for high-value, high-requirement pulsed laser systems.

[0111] Furthermore, based on the above embodiments, this application proposes a driving power supply device, which includes: a pulsed laser driving power supply circuit and an interface module; the interface module is configured as an interface for electrical connection of the pulsed laser driving power supply circuit.

[0112] Specifically, please refer to Figure 13 , Figure 13 This is a schematic diagram of the interface module provided in the embodiments of this application.

[0113] In this embodiment, taking a three-channel pump as an example, the control module outputs drive signals to the first drive module, the second drive module, and the third drive module through ports DA1, DA2, and DA3, respectively; outputs cutoff signals to the first drive module, the second drive module, and the third drive module through ports EN1, EN2, and EN3, respectively; transmits reset signals to the multi-channel overcurrent protection unit through the RESET port; and receives undervoltage status, overcurrent status of the first drive module, overcurrent status of the second drive module, and overcurrent status of the third drive module through ports Condition, Condition1, Condition2, and Condition3, respectively.

[0114] Therefore, the interface module integrates the DA1, DA2, DA3, DA4 (spare port), EN1, EN2, EN3, RESET, Condition, Condition1, Condition2 and Condition3 ports of the control module; each port is electrically connected to the relevant devices in the circuit.

[0115] In this embodiment, a structured interface module is employed, integrating signals such as the drive current setting required for pumping, independent enable control, global reset, and system status monitoring into a unified interface. This achieves physical separation of control signals, status feedback, and power paths, while significantly simplifying external wiring through standardized connection methods. This synergistic optimization of hardware architecture and interface design allows the device to maintain independent and precise control of each channel while greatly improving system reliability, maintainability, and scalability, providing key technical support for the miniaturization and intelligent development of pulsed lasers.

[0116] Compared with the prior art, the beneficial effects of the driving power supply device provided in this application are the same as those of the pulsed laser driving power supply circuit provided in the above embodiments, and will not be repeated here.

[0117] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0118] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0119] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pulsed laser driver power supply circuit, characterized in that, include: Protection filter module, multiple drive modules and control module; The number of drive modules is the same as the number of pumps; Each of the drive modules includes: a step-down unit and a constant current drive unit; The input terminal of the protection filter module is connected to the operating power supply; the first output terminal of the protection filter module is connected to the input terminal of each of the step-down units; the second output terminal of the protection filter module is connected to the first input terminal of the control module; the output terminal of each step-down unit is connected to the first input terminal of the constant current drive unit of the same drive module; the multiple independent drive output terminals of the control module are respectively connected to the second input terminals of each of the constant current drive units; the output terminal of the constant current drive unit is connected to a pump. The protection filtering module is configured to filter the input signal received from the operating power supply and generate a first signal to be output to the step-down unit; when the first signal is lower than a preset voltage value, it outputs an undervoltage signal to the control module. The step-down unit is configured to, upon receiving the first signal, adjust the first signal to a second signal required for pumping and output it to the constant current drive unit of the same drive module; The constant current drive unit is configured to output a constant current to the pump based on the second signal when it receives a drive signal output from the drive output terminal of the control module; and to stop outputting the constant current when it receives a cutoff signal output from the control output terminal of the control module. The control module is configured to output cutoff signals to multiple constant current drive units sequentially according to a timing sequence when it receives an undervoltage signal.

2. The pulsed laser driver power supply circuit as described in claim 1, characterized in that, The protection filtering module includes: an input protection unit, a filtering unit, and an undervoltage monitoring unit; The input terminal of the input protection unit is connected to the operating power supply, and the output terminal of the input protection unit is connected to the input terminal of the filtering unit; the output terminal of the filtering unit is connected to the input terminal of the undervoltage monitoring unit and the input terminal of the step-down unit, respectively, and the output terminal of the undervoltage monitoring unit is connected to the first input terminal of the control module. The input protection unit is configured to output the input signal of the working power supply to the filtering unit, and to stop outputting to the filtering unit when the working power supply is short-circuited or reverse-connected. The filtering unit is configured to filter out common-mode interference and noise from the input signal and then generate a first signal to be output to the step-down unit and the undervoltage monitoring unit. The undervoltage monitoring unit is configured to output an undervoltage signal to the control module when the first signal is lower than a preset voltage value.

3. The pulsed laser driving power supply circuit as described in claim 2, characterized in that, The input protection unit includes: a fuse, a first diode, and a second diode; the filtering unit includes: a common-mode inductor, a filter capacitor, and a first resistor. The first end of the fuse is connected to the operating power supply, and the second end of the fuse is connected to the first end of the common mode inductor and the cathode of the first diode respectively; the anode of the first diode is connected to the second end of the common mode inductor and the anode of the second diode, and the cathode of the second diode is connected to the operating power supply through a connector; The third terminal of the common-mode inductor is connected to the first terminal of the filter capacitor, the input terminal of the step-down unit, and the input terminal of the undervoltage monitoring unit, respectively. The fourth terminal of the common-mode inductor is connected to the second terminal of the filter capacitor. The first terminal of the filter capacitor is also grounded. The first resistor is connected in parallel with the filter capacitor.

4. The pulsed laser driving power supply circuit as described in claim 2, characterized in that, The undervoltage monitoring unit includes: a voltage divider network, a follower, and a first comparator; The input terminal of the voltage divider network is connected to the output terminal of the filter unit, and the output terminal of the voltage divider network is connected to the input terminal of the follower; the output terminal of the follower is connected to the first input terminal of the first comparator, and the second input terminal of the first comparator is set to a preset voltage value; the output terminal of the comparator is connected to the first input terminal of the control module.

5. The pulsed laser driver power supply circuit as described in claim 1, characterized in that, The constant current driving unit includes: a driving locking subunit and an output subunit; The first input terminal of the drive locking subunit is connected to the drive output terminal of the control module, and the output terminal of the drive locking subunit is connected to the drive terminal of the output subunit; the input terminal of the output subunit is connected to the output terminal of the step-down unit, and the output terminal of the output subunit is connected to the pump. The drive locking subunit is configured to turn on the output circuit of the output subunit to output a constant current when it receives a drive signal from the control module.

6. The pulsed laser driver power supply circuit as described in claim 5, characterized in that, The drive-locking subunit includes: a current-limiting resistor, a first operational amplifier, and a second operational amplifier; the output subunit includes: a first MOSFET and a sampling resistor; The first end of the current-limiting resistor is connected to the drive output terminal of the control module; the second end of the current-limiting resistor is connected to the first input terminal of the first operational amplifier; the second input terminal of the first operational amplifier is connected to the output terminal of the second operational amplifier; the output terminal of the first operational amplifier is connected to the gate of the first MOS transistor. The source of the first MOS transistor is connected to the first terminal of the sampling resistor and the input terminal of the second operational amplifier, respectively; the second terminal of the sampling resistor is grounded; the drain of the first MOS transistor is connected to the second terminal of the pump; and the first terminal of the pump is connected to the output terminal of the buck unit.

7. The pulsed laser driving power supply circuit as described in claim 5, characterized in that, The constant current driving unit further includes: a de-driving subunit; The control module is also provided with multiple independent control output terminals, which are connected to the input terminals of each of the release drive subunits; the output terminal of the release drive subunit is connected to the second input terminal of the drive lock subunit; The control module is configured to, upon receiving an undervoltage signal, sequentially output cutoff signals to multiple release drive subunits via the control output terminal according to a timing sequence. The release drive subunit is configured to restrict the flow of the drive signal into the drive lock subunit when a cutoff signal is received; The de-driving subunit includes: a second MOS transistor; the gate of the second MOS transistor is connected to the control output terminal of the control module; the source of the second MOS transistor is grounded; and the drain of the second MOS transistor is connected to the second input terminal of the driving lock subunit.

8. The pulsed laser driving power supply circuit as described in claim 1, characterized in that, The drive module further includes: an overcurrent protection unit; The input terminal of the overcurrent protection unit is connected to the output terminal of the constant current drive unit of the same drive module; the output terminal of the overcurrent protection unit is connected to the second input terminal of the control module. The overcurrent protection unit is configured to generate an overcurrent signal and transmit it to the control module when the constant current is higher than a preset current value. The control module is configured to output cutoff signals to multiple constant current drive units sequentially according to a timing sequence when an overcurrent signal is received.

9. The pulsed laser driving power supply circuit as described in claim 8, characterized in that, The overcurrent protection unit includes: a second comparator, a second diode, and a first transistor; The first input terminal of the second comparator is connected to the output terminal of the constant current driving unit, the collector of the first transistor, and the cathode of the second diode, respectively; the second input terminal of the second comparator is connected to the reference power supply; the output terminal of the second comparator is connected to the second input terminal of the control module; the emitter of the first transistor is grounded; and the base of the first transistor is connected to the reset output terminal of the control module.

10. A driving power supply device, characterized in that, The driving power supply device includes a pulsed laser driving power supply circuit and an interface module as described in any one of claims 1 to 9; The interface module is configured as an electrical connection interface for the pulsed laser driver power supply circuit.

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