A laser pump source driver and driving method, and a laser

Abstract

The application discloses a laser pump source driver and a driving method and a laser. The driver comprises a signal detection module, which detects a DA signal of a load current setting of a power supply module in real time; an instruction generation module, which is used for generating a feedforward boost control instruction when a change rate of the DA signal exceeds a preset change rate threshold or a change amplitude exceeds a preset change amplitude threshold, the feedforward boost control instruction comprising a preset boost amplitude and a boost duration; a power supply module, which receives the feedforward boost control instruction and increases an output voltage by the preset boost amplitude within the boost duration; and the instruction generation module generates a feedforward boost control instruction cancellation after the boost duration ends and applies the feedforward boost control instruction cancellation to the power supply module, so that the power supply module restores the output voltage to a normal value. Thus, the problem of current rapid drop caused by load change is solved.

Description

Technical Field

[0001] This invention relates to the field of laser pump source driving technology, and particularly to a laser pump source driver and driving method, and a laser. Background Technology

[0002] In high-power precision constant current source applications, multi-stage power supply architectures are widely used due to their advantages of high efficiency and good isolation. However, this architecture has significant drawbacks: when a full load is suddenly applied from an idle standby state, a noticeable rapid current drop (also known as a pit) is easily observed on the rising edge of the output current. Laser loads have extremely stringent requirements for the stability, noise, and dynamic response characteristics of the drive current. Any minute fluctuation in the drive current can trigger a series of serious problems: output optical power fluctuations, leading to product defects in industrial applications such as laser welding and cutting; excitation wavelength drift or spectral broadening, fatally impacting scientific research such as spectral analysis; and laser mode instability, even causing mode jumping, severely damaging the laser's coherence and beam quality. In the initial positioning and perforation stage of laser processing, if the first pulse current exhibits drop-off jitter, the workpiece may not be properly processed, requiring secondary processing and significantly impacting production efficiency.

[0003] To address the aforementioned problem of rapid current sag, existing technologies have proposed two solutions: The first solution is to increase the capacitance of the bus capacitor and the output capacitor, but this solution is costly, requires large equipment size, and has limited effectiveness in improving rapid current sag; the second solution is to improve transient response by increasing the loop bandwidth of each power supply stage, but the load's dynamic response to current is much higher than the loop's response speed, limiting the potential for increasing loop bandwidth. Furthermore, in multi-level isolated topology systems, the mutual influence of each loop stage and the phase delay caused by isolation further restrict bandwidth improvement and may also jeopardize system stability.

[0004] Therefore, there is an urgent need for a precise, fast, and low-cost solution to compensate for the shortcomings of existing technologies. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a laser pump source driver and driving method, and a laser, to solve the problem of current drop during the rising edge of the first square wave output current in a multi-stage power supply architecture when the load changes.

[0006] To solve the above-mentioned technical problems, the first aspect of the present invention provides the following technical solution: a laser pump source driver, comprising: a signal detection module, a command generation module, a power supply module, and a linear constant current source module; wherein: The signal detection module is used to detect the DA signal of the load current setting of the power supply module in real time. The instruction generation module, which is connected to the signal detection module and the power supply module respectively, is used to generate a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, and apply the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost magnitude and a boost duration. The power module is configured to receive the feedforward boost control command and then temporarily increase the output voltage by the preset boost amplitude during the boost duration. The instruction generation module is further configured to generate a command to cancel the feedforward boost control after the boost duration ends, and apply the command to cancel the feedforward boost control to the power supply module; The power module is also used to restore the output voltage to the normal value according to the received command to cancel the feedforward boost control.

[0007] Optionally, the feedforward boost control command is sent to the power supply module through the pulse width modulation output port or analog output port of the command generation module, and the transmission path of the feedforward boost control command adopts an isolation module to achieve high and low voltage isolation.

[0008] Optionally, the power supply module includes an AC-DC module, which converts the input AC power into unidirectional pulsating DC power and boosts the power of the unidirectional pulsating DC power to obtain a high-voltage DC bus voltage.

[0009] Optionally, the power supply module further includes: a DC-DC module, a linear constant current source module, and a voltage source control chip. The DC-DC module is used to invert the high-voltage DC bus voltage into a smooth output voltage under the drive of the voltage source control chip and feed it back to the voltage source control chip; at the same time, it outputs the output voltage to the linear constant current source module.

[0010] Optionally, the voltage source control chip is used to receive the feedforward boost control command and the feedback signal of the output voltage, temporarily increase the output voltage of the DC-DC module by the preset boost amplitude during the boost duration, and restore the output voltage of the DC-DC module to the normal value according to the received cancel feedforward boost control command after the boost duration ends.

[0011] Optionally, the linear constant current source module includes a sixth MOSFET and a linear constant current source, wherein: The sixth MOSFET is connected to the linear constant current source and the DC-DC module respectively. During the boost duration, the DC-DC module temporarily increases the preset boost amplitude to increase the voltage difference of the sixth MOSFET and realize current control for the linear constant current source. The linear constant current source is used to provide a stable and constant current output to the pump source.

[0012] Optionally, the laser pump source driver further includes a temperature compensation module, which integrates a temperature sensor. When the ambient temperature exceeds a preset temperature, the temperature compensation module controls the preset boost amplitude to automatically increase the preset voltage.

[0013] Optionally, the laser pump source driver further includes a multi-protection module, which includes overvoltage protection, overcurrent protection, and / or undervoltage protection.

[0014] Accordingly, a second aspect of the present invention provides the following technical solution: a laser pump source driving method, applied to the laser pump source driver described in the first aspect of the present invention, the laser pump source driving method comprising: The signal detection module detects the DA signal set by the load current of the power supply module in real time. The instruction generation module is used to generate a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, and to apply the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost magnitude ΔV and a boost duration T. After receiving the feedforward boost control command, the power module temporarily increases the output voltage by the preset boost amplitude ΔV during the boost duration T. After the boost duration T ends, the instruction generation module generates a command to cancel the feedforward boost control and applies the command to the power supply module. The power module restores the output voltage to its normal value according to the received command to cancel the feedforward boost control.

[0015] Accordingly, a third aspect of the present invention provides the following technical solution: a laser, the laser comprising a laser pump source driver as described in the first aspect of the present invention and at least one pump source, wherein: The laser pump source driver is connected to the pump source and is used to drive the pump source; The pump source is used to emit laser light under drive.

[0016] Compared with related technologies, the present invention provides a laser pump source driver and driving method, and a laser. The laser pump source driver has an adaptive function, which uses a signal detection module to detect the DA signal set by the load current of the power supply module in real time. An instruction generation module generates a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold. This instruction is then applied to the power supply module. The feedforward boost control instruction includes a preset boost magnitude ΔV and a boost duration T. After receiving the feedforward boost control instruction, the power supply module temporarily increases the output voltage by the preset boost magnitude ΔV within the boost duration T, providing adjustment margin for the linear constant current source module in the power supply module. After the boost duration T ends, the instruction generation module generates a command to cancel the feedforward boost control, and the power supply module restores the output voltage to its normal value according to the command. By employing a feedforward boost control mechanism to initiate compensation before or simultaneously with the actual current change when detecting load changes in real-time DA signals, this avoids the delay issues of traditional feedback control. It accurately compensates for rapid current drops caused by load changes and quickly offsets voltage drops caused by sudden load changes, ensuring high stability of the DC-DC converter's output current and sufficient adjustment margin for the linear constant current source module in the power supply module. Ultimately, it achieves a smooth, drop-free rise in output current, meeting the stringent current stability requirements of the laser. The temporary boost design avoids steady-state efficiency loss, eliminates the need for significantly increasing capacitor specifications, reduces hardware costs and equipment size, and balances cost-effectiveness with system efficiency. This solves the problem of current drops occurring during the rising edge of the first square wave output current in multi-stage power supply architectures when experiencing sudden load changes. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 A schematic diagram of the structure of a laser processing system provided by the present invention; Figure 2 A schematic diagram of the structure of a laser pump source driver provided by the present invention; Figure 3 This invention provides a schematic diagram of the power supply module in a laser pump source driver. Figure 4 A schematic diagram of a power supply module in a laser pump source driver provided by the present invention; Figure 5The pulse waveform diagram before the laser pump source driver provided in this invention is used in the multi-stage power architecture and is optimized. Figure 6 The pulse waveform diagram of the laser pump source driver optimized using the present invention is shown for a multi-stage power architecture. Figure 7 A schematic flowchart of a laser pump source driving method provided by the present invention; Figure 8 This is a schematic diagram of the structure of a laser provided by the present invention. Detailed Implementation

[0019] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] As one embodiment of this application, please refer to Figure 1 It provides a laser processing system, including: laser processing equipment 100 and laser 200.

[0023] Laser 200 is either a continuous laser or a pulsed laser. When laser 200 is connected to laser processing equipment 100, laser processing equipment 100 establishes a communication connection with laser 200 through a laser communication interface. For example, the laser communication interface is an RS232 interface. Laser processing equipment 100 communicates with laser 200 through the RS232 interface. Laser processing equipment 100 adaptively identifies the laser 200 model through its internal software protocol, thereby adapting to and driving laser 200. Laser processing equipment 100 outputs a laser enable signal to the laser communication interface, causing laser 200 connected to the laser communication interface to execute the laser parameters in the processing parameters.

[0024] The laser 200 includes a pump source driver 210 and a power master control 220, which are part of the laser 200. The pump source driver 210 is used to control the pump source within the laser 200.

[0025] In high-power precision constant current source applications, multi-stage power supply architecture is widely used due to its advantages of high efficiency and good isolation. However, this architecture has a significant drawback: when the load changes, the rising edge of the output current is prone to a significant rapid current drop (also known as a pit).

[0026] To address the aforementioned problem of rapid current sag, existing technologies have proposed two solutions: The first solution is to increase the capacitance of the bus capacitor and the output capacitor, but this solution is costly, requires large equipment size, and has limited effectiveness in improving rapid current sag; the second solution is to improve transient response by increasing the loop bandwidth of each power supply stage, but the load's dynamic response to current is much higher than the loop's response speed, limiting the potential for increasing loop bandwidth. Furthermore, in multi-level isolated topology systems, the mutual influence of each loop stage and the phase delay caused by isolation further restrict bandwidth improvement and may also jeopardize system stability.

[0027] Therefore, there is an urgent need for a precise, fast, and low-cost solution to compensate for the shortcomings of existing technologies.

[0028] After in-depth analysis, the inventors discovered that the root cause of the rapid current drop is that when the load changes abruptly, the huge transient current demand causes the output capacitor voltage of the isolated DC-DC converter and the bus capacitor voltage of the Boost circuit to drop instantaneously. The loop response delay of the power supply link makes the input voltage of the subsequent linear constant current source insufficient, loses sufficient adjustment margin, and cannot maintain constant current accuracy.

[0029] To address this issue, this invention provides a laser pump source driver with automatic adaptation capabilities. Through an innovative feedforward boost control mechanism, it precisely compensates for the rapid current drop caused by load changes, ensuring high stability of the power module's output current and meeting the stringent requirements of the laser for drive current, while also considering cost-effectiveness and system efficiency. This solves the problem of current drop during the rising edge of the first square wave output current in multi-stage power architectures when the load changes.

[0030] Please refer to Figure 2 This invention provides a laser pump source driver 800, comprising: a signal detection module 810, a command generation module 820, and a power supply module 830; wherein: The signal detection module 810 is used to detect the DA signal of the load current setting of the power supply module 830 in real time. The instruction generation module 820 is connected to the signal detection module 810 and the power supply module 830 respectively. When the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, the instruction generation module 820 generates a feedforward boost control instruction and applies the feedforward boost control instruction to the power supply module 830. The feedforward boost control instruction includes a preset boost amplitude ΔV and a boost duration T. Power module 830 is used to temporarily increase the output voltage by the preset boost amplitude ΔV during the boost duration T according to the feedforward boost control command; The instruction generation module 820 is further configured to generate a cancel feedforward boost control instruction after the boost duration T ends, and apply the cancel feedforward boost control instruction to the power supply module 830; The power module 830 is also used to restore the output voltage to the normal value according to the received command to cancel the feedforward boost control.

[0031] In this embodiment, a laser pump source driver is provided. This laser pump source driver has an adaptive function, which detects the DA signal set by the load current of the power supply module in real time through a signal detection module. The instruction generation module generates a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, and applies the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost amplitude ΔV and a boost duration T. According to the feedforward boost control instruction, the power supply module temporarily increases the output voltage by the preset boost amplitude ΔV within the boost duration T, providing adjustment margin for the linear constant current source module in the power supply module. After the boost duration T ends, the instruction generation module generates a command to cancel the feedforward boost control, and the power supply module restores the output voltage to the normal value according to the command to cancel the feedforward boost control. By employing a feedforward boost control mechanism to initiate compensation before or simultaneously with the actual current change when detecting load changes in real-time DA signals, this avoids the delay issues of traditional feedback control. It accurately compensates for rapid current drops caused by load changes and quickly offsets voltage drops caused by sudden load changes, ensuring high stability of the DC-DC converter's output current and sufficient adjustment margin for the linear constant current source module in the power supply module. Ultimately, it achieves a smooth, drop-free rise in output current, meeting the stringent current stability requirements of the laser. The temporary boost design avoids steady-state efficiency loss, eliminates the need for significantly increasing capacitor specifications, reduces hardware costs and equipment size, and balances cost-effectiveness with system efficiency. This solves the problem of current drops occurring during the rising edge of the first square wave output current in multi-stage power supply architectures when the load changes.

[0032] In one embodiment, the signal detection module 810 is used to detect the DA signal of the load current setting of the power supply module 830 in real time.

[0033] Furthermore, the signal detection module 810 also employs a filtering algorithm to enhance its anti-interference capability when detecting the load current setting DA signal of the linear constant current source module 840 in real time.

[0034] For example, the signal detection module 810 employs an anti-interference measure combining RC low-pass filtering and moving average filtering algorithms. For instance, the parameters of the RC low-pass filter are R=1kΩ and C=10nF, the window size of the moving average filtering algorithm is 5-10 sampling points, and the detection frequency is set to 1MHz. This combination of RC low-pass filtering and moving average filtering enhances the anti-interference capability when real-time detecting the DA signal set by the load current of the linear constant current source module 840.

[0035] The signal detection module 810 includes a DA signal detection interface, which supports 0-5V or 4-20mA standard signals. The transmission path of the DA signal detection interface uses an isolation module to achieve high and low voltage isolation.

[0036] It is understood that the signal detection module 810 can be a device or chip with signal detection and filtering functions. For example, the signal detection module 810 can be an analog front-end (AFE) chip with high-precision signal detection and integrated filtering, or a communication-specific chip with RF / protocol signal detection and filtering, or a discrete device with passive components for filtering and detection circuitry. This invention does not limit this further.

[0037] In this embodiment, by reasonably setting the detection threshold (preset change rate threshold or change amplitude exceeding the preset change amplitude threshold), the load change event can be accurately identified, avoiding missed detections or false detections. Furthermore, the combined anti-interference measures of RC low-pass filtering and moving average filtering algorithms can effectively suppress the influence of electromagnetic interference on the DA signal, improve the stability and accuracy of signal detection, ensure the reliable triggering of the compensation mechanism, and further enhance the working stability of the laser pump source driver 800 in complex electromagnetic environments. The laser pump source driver 800 supports a standard DA signal interface, ensuring compatibility with different types of lasers. The signal transmission path adopts an isolation design to avoid interference between high and low voltage circuits and ensure the reliability of signal transmission.

[0038] In one embodiment, the instruction generation module 820 is configured to generate a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, and apply the feedforward boost control instruction to the power supply module 830, wherein the feedforward boost control instruction includes a preset boost magnitude ΔV and a boost duration T.

[0039] Specifically, the preset change amplitude threshold is the percentage change in the full-load current corresponding to the DA signal. For example, if the percentage change is 40%-60%, then the preset change amplitude threshold is 40%-60% of the full-load current corresponding to the DA signal. When the change amplitude of the DA signal is detected to exceed 40%-60% of the full-load current corresponding to the DA signal in real time, a load change event is determined to have occurred. When the instruction generation module 820 detects this change, it generates a feedforward boost control command and applies the feedforward boost control command to the power supply module 830.

[0040] The preset rate of change threshold is the amount of change in the DA signal over a preset time. For example, a preset rate of change threshold of 1V / μs means that the voltage change rate is 1V within a preset time of 1μs. When the rate of change of the DA signal is detected to exceed 1V / μs in real time, a load change event is determined to have occurred. When the instruction generation module 820 detects this change, it generates a feedforward boost control command and applies the feedforward boost control command to the power supply module 830.

[0041] Specifically, the preset boost amplitude ΔV is a pre-set positive voltage increment, and the value of the preset boost amplitude ΔV is: ΔV = ΔV_drop + V_safety, where ΔV_drop is the measured value of the voltage drop under uncompensated state when the load is suddenly subjected to full load in standby mode, and V_safety is the minimum safe voltage difference of the MOSFET in the linear constant current source module.

[0042] The range of the preset boost amplitude ΔV is related to the laser pump source used. Different types of laser pump sources have different ranges of preset boost amplitude ΔV. For example, for laser pump sources of 10W-500W, the range of preset boost amplitude ΔV can be 3V-10V; for laser pump sources exceeding 500W, the range of preset boost amplitude ΔV can be 10V-15V.

[0043] The specific value of the preset boost amplitude ΔV is closely related to the experience value of each manufacturer, and the specific value of the preset boost amplitude ΔV used by each manufacturer is not exactly the same. Therefore, it will not be explained in detail here.

[0044] In this embodiment, by clearly defining the calculation logic of the preset boost amplitude ΔV and the value range of different power levels, it is possible to ensure that the preset boost amplitude ΔV can completely cover the voltage drop value, and to ensure that the MOSFET operates in a safe range through the minimum safe voltage difference V_safety, avoiding breakdown or excessive power consumption. The differentiated values ​​for different power scenarios enable the laser pump source driver 800 of this invention to be adapted to a wide power range of laser pump sources from 10W to 500W and above, improving the versatility and reliability of the laser pump source driver 800.

[0045] The boost duration T is a preset time length, that is, the duration for which the output voltage of the power module 830 temporarily increases by the preset boost amplitude ΔV. The value of the boost duration T is: T = t_rise + t_delay, where t_rise is the time for the output current to rise from 0 to full load current (e.g., t_rise ≤ 50μs), and t_delay is the loop response delay of the power module (e.g., the value of t_delay ranges from 10μs to 30μs).

[0046] For example, for a low-frequency pulse mode with a pulse frequency ≤ 1 kHz, the boost duration T can be in the range of 50 μs to 200 μs; for a mid-frequency pulse mode with a pulse frequency of 1 kHz to 10 kHz, the boost duration T can be in the range of 30 μs to 100 μs.

[0047] The specific value of the boost duration T is closely related to the experience value of each manufacturer, and the specific value of the boost duration T used by each manufacturer is not exactly the same. Therefore, it will not be explained in detail here.

[0048] Furthermore, the feedforward boost control command is sent to the voltage source control chip U1 of the power supply module 830 through the PWM (Pulse-width modulation) output port or analog output port of the command generation module 820 (e.g., DSP chip). The transmission path of the feedforward boost control command adopts an isolation module to achieve high and low voltage isolation.

[0049] It is understood that the instruction generation module 820 can be a device or chip with digital signal processing capabilities. For example, the instruction generation module 820 can be a DSP (Digital Signal Processing) chip or a general-purpose processor chip. This invention does not limit it in this regard.

[0050] In this embodiment, the calculation logic of the boost duration T ensures that it covers the current rise time and loop response delay, guaranteeing timely restoration of normal voltage after current stabilization. This avoids insufficient compensation and current drop due to an excessively short boost duration T, while also preventing excessively high steady-state power consumption due to an excessively long boost duration T. By adjusting the value of the boost duration T in combination with different pulse frequency modes, the laser pump source driver 800 can achieve optimal compensation in both low-frequency and medium-frequency pulse modes, expanding its applicable scenarios. The transmission path of the feedforward boost control command uses an isolation module to achieve high-low voltage isolation, avoiding interference between high- and low-voltage circuits and ensuring the reliability of signal transmission. The feedforward boost control command has multiple transmission port options, enhancing the adaptability of the laser pump source driver 800 in different hardware design scenarios and improving the flexibility of engineering implementation.

[0051] In one embodiment, the power supply module 830 is configured to, after receiving the feedforward boost control command, temporarily increase the output voltage by the preset boost amplitude ΔV during the boost duration T, providing adjustment margin for the linear constant current source module 833 in the power supply module; after the boost duration T ends, restore the output voltage to the normal value according to the received cancel feedforward boost control command.

[0052] For details, please refer to Figure 3 The power supply module 830 includes: an AC-DC module 831, a DC-DC module 832, a linear constant current source module 833, and a voltage source control chip U1, wherein: The AC-DC module 831 is used to convert the input AC power Vi into unidirectional pulsating DC power and boost the power of the unidirectional pulsating DC power to obtain the high voltage DC bus voltage; The DC-DC module 832 is used to invert the high-voltage DC bus voltage into a smooth DC output voltage V0 under the drive of the voltage source control chip U1 and feed it back to the voltage source control chip U1; at the same time, it outputs the output voltage V0 to the linear constant current source module 833 to provide adjustment margin for the linear constant current source module 833. The voltage source control chip U1 is used to receive a feedforward boost control command including a preset boost amplitude ΔV and a boost duration T, and a feedback signal of the output voltage V0. During the boost duration T, the output voltage V0 of the DC-DC module 832 is temporarily increased by the preset boost amplitude ΔV. After the boost duration T ends, the output voltage V0 of the DC-DC module 832 is restored to the normal value according to the received cancel feedforward boost control command.

[0053] In this embodiment, a power supply module is provided. An AC-DC module converts input AC power into unidirectional pulsating DC power and boosts the power of the unidirectional pulsating DC power to obtain a high-voltage DC bus voltage. The DC-DC module, driven by a voltage source control chip, inverts the high-voltage DC bus voltage into a smooth DC output voltage and feeds it back to the voltage source control chip. Simultaneously, it outputs the output voltage to a linear constant current source module, providing adjustment margin for the linear constant current source module. The voltage source control chip receives a feedforward boost control command including a preset boost amplitude ΔV and a boost duration T, as well as a feedback signal of the output voltage. During the boost duration T, it temporarily increases the output voltage of the DC-DC module by the preset boost amplitude ΔV. After the boost duration T ends, according to the received command to cancel the feedforward boost control, it restores the output voltage of the DC-DC module to its normal value, achieving closed-loop voltage regulation control. This allows compensation to be initiated before or simultaneously with the actual current change based on the received feedforward boost control command, avoiding the delay problem of traditional feedback control. It accurately compensates for rapid current drops caused by load changes and quickly offsets voltage drops caused by sudden load changes, ensuring high stability of the DC-DC module's output current and sufficient adjustment margin for the linear constant current source module. Ultimately, it achieves a smooth, drop-free rise in output current. The temporary boost design avoids steady-state efficiency loss, eliminates the need for significantly increasing capacitor specifications, reduces hardware costs and equipment size, and balances cost-effectiveness with system efficiency. This solves the problem of current drops occurring during the rising edge of the first square wave output current in multi-stage power supply architectures when the load changes.

[0054] In one embodiment, the AC-DC module 831 is used to convert the input AC power Vi into unidirectional pulsating DC power and to boost the power of the unidirectional pulsating DC power to obtain a high-voltage DC bus voltage.

[0055] For details, please refer to Figure 4 The AC-DC module 831 includes: filter E1, rectifier bridge, and push-pull power factor correction (PFC) circuit.

[0056] Among them, filter E1 is used to perform EMI filtering on the AC power Vi input through interface J1 and interface J2, suppress high-frequency interference from the power grid, and ensure the purity of the input AC power Vi.

[0057] The rectifier bridge converts the input AC current Vi into unidirectional pulsating DC current. The rectifier bridge includes: a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, wherein: The cathode of the first diode D1 is connected to the anode of the third diode D3. The connection point of the first diode D1 and the third diode D3 is the first input terminal of the rectifier bridge and is connected to the first output terminal of the filter E1. The cathode of the third diode D3 is connected to the cathode of the fourth diode D4. The connection point of the third diode D3 and the fourth diode D4 is the cathode of the rectifier bridge. The negative terminal of the second diode D2 is connected to the positive terminal of the fourth diode D4. The connection point of the second diode D2 and the fourth diode D4 is the second input terminal of the rectifier bridge, which is connected to the second output terminal of the filter E1. The positive terminals of the first diode D1 and the second diode D2 are connected. The connection point of the first diode D1 and the second diode D2 is the positive terminal of the rectifier bridge.

[0058] Among them, the push-pull power factor correction circuit is used to boost the power of the unidirectional pulsating DC output from the rectifier bridge to obtain the high-voltage DC bus voltage.

[0059] Specifically, the push-pull power factor correction circuit includes: a first inductor L1, a second inductor L2, a fifth diode D5, a sixth diode D6, a seventh diode D7, a seventh MOSFET Q7, an eighth MOSFET Q8, and a first capacitor C1; wherein: The first terminal of the first inductor L1 is connected to the negative terminal of the rectifier bridge, the second terminal of the first inductor L1 is connected to the positive terminal of the sixth diode D6, the negative terminal of the sixth diode D6 is connected to the first terminal of the first capacitor C1, the drain of the seventh MOSFET Q7 is connected to the connection point between the second terminal of the first inductor L1 and the positive terminal of the sixth diode D6, the source of the seventh MOSFET Q7 is connected to the positive terminal of the rectifier bridge and the second terminal of the first capacitor C1, and the gate of the seventh MOSFET Q7 is connected to the externally input control signal. The first terminal of the second inductor L2 is connected to the negative terminal of the rectifier bridge, the second terminal of the second inductor L2 is connected to the positive terminal of the seventh diode D7, the negative terminal of the seventh diode D7 is connected to the first terminal of the first capacitor C1, the drain of the eighth MOSFET Q8 is connected to the connection point between the second terminal of the second inductor L2 and the positive terminal of the seventh diode D7, the source of the eighth MOSFET Q8 is connected to the positive terminal of the rectifier bridge and the second terminal of the first capacitor C1, and the gate of the eighth MOSFET Q8 is connected to the externally input control signal. The positive terminal of the fifth diode D5 is connected to the negative terminal of the rectifier bridge, and the negative terminal of the fifth diode D5 is connected to the first terminal of the first capacitor C1.

[0060] In operation, the push-pull power factor correction circuit alternately turns on the seventh MOSFET Q7 and the eighth MOSFET Q8 under the control of an externally input control signal. This drives the first inductor L1 and the second inductor L2 to store the unidirectional pulsating DC current. The energy is then transferred to the first capacitor C1 through the fifth diode D5, the sixth diode D6, and the seventh diode D7, forming a high-voltage DC bus across the first capacitor C1. A high-voltage DC bus voltage can be obtained across the first capacitor C1. In this embodiment, the push-pull power factor correction circuit improves the input power factor, enhances the power of the unidirectional pulsating DC current, reduces harmonic pollution, stabilizes the DC bus voltage, and provides a reliable high-voltage DC input for the subsequent inverter stage.

[0061] In one embodiment, the DC-DC module 832 is used to invert the high-voltage DC bus voltage into a smooth DC output voltage V0 under the drive of the voltage source control chip U1, and feed it back to the voltage source control chip U1; at the same time, it outputs the output voltage V0 to the linear constant current source module to provide adjustment margin for the linear constant current source module.

[0062] For details, please refer to Figure 4 The DC-DC module 832 includes: a full-bridge inverter circuit, transformer B1, a primary rectifier circuit, and an output filter circuit.

[0063] Transformer B1 is used to achieve electrical isolation between the AC input voltage and the DC output voltage. Transformer B1 includes a primary positive terminal, a primary negative terminal, a secondary positive terminal, and a secondary negative terminal.

[0064] The full-bridge inverter circuit is used to convert the high-voltage DC bus voltage into high-frequency square wave AC power under the drive of the voltage source control chip U1.

[0065] Specifically, the full-bridge inverter circuit includes: a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, and a fourth MOSFET Q4. These four MOSFETs form a full-bridge topology, wherein: The gate of the first MOSFET Q1 is connected to the voltage source control chip U1, the drain of the first MOSFET Q1 is connected to the first terminal of the first capacitor C1, the source of the first MOSFET Q1 is connected to the drain of the second MOSFET Q2, the gate of the second MOSFET Q2 is connected to the voltage source control chip U1, and the source of the second MOSFET Q2 is connected to the second terminal of the first capacitor C1. The connection point between the source of the first MOSFET Q1 and the drain of the second MOSFET Q2 serves as the first output terminal of the full-bridge inverter circuit and is connected to the primary negative terminal of the transformer B1 through the second capacitor C2. The high-frequency square wave AC power output from the first output terminal of the full-bridge inverter circuit is filtered by the second capacitor C2 and then input to the primary negative terminal of the transformer B1. The gate of the third MOSFET Q3 is connected to the voltage source control chip U1, the drain of the third MOSFET Q3 is connected to the first terminal of the first capacitor C1, the source of the third MOSFET Q3 is connected to the drain of the fourth MOSFET Q4, the gate of the fourth MOSFET Q4 is connected to the voltage source control chip U1, and the source of the fourth MOSFET Q4 is connected to the second terminal of the first capacitor C1. The connection point between the source of the third MOSFET Q3 and the drain of the fourth MOSFET Q4 serves as the second output terminal of the full-bridge inverter circuit and is connected to the primary positive terminal of the transformer B1 through the third inductor L3. The high-frequency square wave AC power output from the second output terminal of the full-bridge inverter circuit is filtered by the third inductor L3 and then input to the primary positive terminal of the transformer B1.

[0066] The primary rectifier circuit is used to rectify the high-frequency square wave AC power after inversion, so that transformer B1 outputs high-frequency pulsating DC power, and the output high-frequency pulsating DC power meets the required output voltage amplitude.

[0067] Specifically, the primary rectifier circuit includes: an eighth diode D8 and a ninth diode D9. The positive terminal of the eighth diode D8 is connected to the second terminal of the first capacitor C1, the negative terminal of the eighth diode D8 is connected to the positive terminal of the ninth diode D9, the negative terminal of the ninth diode D9 is connected to the first terminal of the first capacitor C1, and the connection point between the negative terminal of the eighth diode D8 and the positive terminal of the ninth diode D9 serves as the output terminal of the primary rectifier circuit and is connected to the primary positive terminal of the transformer B1.

[0068] The output filter circuit converts the high-frequency pulsating DC into a smooth DC output voltage V0, which is then fed back to the voltage source control chip U1. At the same time, it outputs the output voltage V0 to the linear constant current source module, providing adjustment margin for the linear constant current source module.

[0069] For details, please refer to Figure 4 The output filtering circuit includes a full-wave rectifier bridge and an LC output filter.

[0070] The full-wave rectifier bridge is used to rectify the high-frequency pulsating DC voltage output from the secondary winding of transformer B1, reducing voltage ripple. The full-wave rectifier bridge includes: diodes D10 (tenth), D11 (eleventh), D12 (twelfth), and D13 (thirteenth), wherein: The cathode of the tenth diode D10 is connected to the anode of the thirteenth diode D13. The connection point of the tenth diode D10 and the thirteenth diode D13 is the first input terminal of the full-wave rectifier bridge and is connected to the positive terminal of the secondary winding of transformer B1. The cathode of the thirteenth diode D13 is connected to the cathode of the twelfth diode D12. The connection point of the thirteenth diode D13 and the twelfth diode D12 is the cathode of the full-wave rectifier bridge. The negative terminal of the eleventh diode D11 is connected to the positive terminal of the twelfth diode D12. The connection point of the eleventh diode D11 and the twelfth diode D12 is the second input terminal of the full-wave rectifier bridge, which is connected to the negative terminal of the secondary winding of transformer B1. The positive terminal of the tenth diode D10 is connected to the positive terminal of the eleventh diode D11. The connection point of the tenth diode D10 and the eleventh diode D11 is the positive terminal of the full-wave rectifier bridge.

[0071] The LC output filter is used to convert the rectified high-frequency pulsating DC voltage into a smooth DC output voltage V0, which is then fed back to the voltage source control chip U1. At the same time, the output voltage V0 is output to the linear constant current source module, providing adjustment margin for the linear constant current source module.

[0072] Specifically, the LC output filter includes: a fourth inductor L4 and a third capacitor C3. The first terminal of the fourth inductor L4 is connected to the negative terminal of the full-wave rectifier bridge, and the second terminal of the fourth inductor L4 is the positive output terminal of the DC-DC module 832. The positive terminal of the full-wave rectifier bridge is the negative output terminal of the DC-DC module 832. The third capacitor C3 is connected in parallel to the positive output terminal and the negative output terminal of the DC-DC module 832 to further filter the output voltage V0 of the DC-DC module 832.

[0073] In one embodiment, the voltage source control chip U1 is used to receive a feedforward boost control command including a preset boost amplitude ΔV and a boost duration T, and a feedback signal of the output voltage V0. During the boost duration T, the output voltage V0 of the DC-DC module 832 is temporarily increased by the preset boost amplitude ΔV. After the boost duration T ends, the output voltage V0 of the DC-DC module 832 is restored to its normal value according to the received cancel feedforward boost control command.

[0074] Specifically, the signal detection module 810 detects the DA signal set by the load current of the linear constant current source module 833 in real time; the instruction generation module 820 is used to generate a feedforward boost control instruction including a preset boost amplitude ΔV and a boost duration T when the rate of change of the detected DA signal exceeds a preset rate of change threshold or the amplitude of change exceeds a preset amplitude threshold, apply the feedforward boost control instruction to the voltage source control chip U1 of the power supply module 830, and cancel the feedforward boost control instruction after the boost duration T ends, and apply the cancel feedforward boost control instruction to the voltage source control chip U1.

[0075] The voltage source control chip U1 receives a feedforward boost control command including a preset boost amplitude ΔV and boost duration T, and a feedback signal of the output voltage V0. During the boost duration T, the complementary drive duty cycle of the first MOSFET Q1 and the third MOSFET Q3 in the DC-DC module 832 is fixed at 0.5 to ensure the base frequency of the full-bridge inverter. The drive duty cycle of the second MOSFET Q2 and the fourth MOSFET Q4 is dynamically adjusted to change the effective voltage of the secondary output of transformer B1, so that the final output voltage V0 accurately follows the change of the DA signal and increases by ΔV. After the boost duration T ends, according to the received command to cancel the feedforward boost control, the complementary drive duty cycle of the first MOSFET Q1 and the third MOSFET Q3 and the drive duty cycle of the second MOSFET Q2 and the fourth MOSFET Q4 are restored to their initial values, and the output voltage V0 of the secondary of transformer B1 is restored to its normal value.

[0076] Specifically, after receiving the feedforward boost control command, the voltage source control chip U1 quickly adjusts its duty cycle, changes the effective voltage output from the secondary winding of transformer B1, and converts the output voltage V from transformer B1 after passing through the output filter circuit. O Increase to the set value, so that the output voltage V ODuring the boost duration T, the preset boost amplitude ΔV is temporarily increased to the set value, so that the final output voltage V0 accurately follows the change of the DA signal and increases ΔV, thereby increasing the voltage difference of MOSFET (Metal Oxide Semiconductor Field Effect Transistor) Q6 in the linear constant current source module, and finally providing sufficient adjustment margin for the linear constant current source V in the linear constant current source module. The set value is the sum of the original output voltage of transformer B1 and the preset boost amplitude ΔV. After the boost duration T ends, after receiving the command to cancel the feedforward boost control, the complementary drive duty cycle of the first MOSFET Q1 and the third MOSFET Q3 and the drive duty cycle of the second MOSFET Q2 and the fourth MOSFET Q4 are quickly restored to the initial value, changing the effective voltage of the secondary output of transformer B1, and restoring the output voltage V0 of the secondary of transformer B1 to the normal value.

[0077] Furthermore, the voltage source control chip U1 has a hardware timer internally, which is used to time the boost duration T. The voltage source control chip U1 adjusts the duty cycle according to the feedforward boost control command to temporarily increase the output voltage V of transformer B1. O The timing starts when the voltage is increased to the set value and stops when the voltage increase duration T ends. The timing period is the voltage increase duration T.

[0078] It should be noted that in this invention, the preset boost amplitude ΔV and boost duration T are built into the voltage source control chip U1. The voltage source control chip U1 obtains the feedback signal of the output voltage V0 of the externally input feedforward boost control command. During the boost duration T, it temporarily increases the output voltage V0 of the DC-DC module by the preset boost amplitude ΔV. After the boost duration T ends, according to the received cancel feedforward boost control command, it restores the output voltage V0 of the DC-DC module 832 to its normal value. In essence, it obtains the external feedforward boost control command signal and triggers the action of adjusting the duty cycle. The voltage source control chip U1 temporarily increases the output voltage V of the transformer B1 by adjusting the complementary drive duty cycle of the first MOSFET Q1 and the third MOSFET Q3 and the drive duty cycle of the second MOSFET Q2 and the fourth MOSFET Q4. O The process of raising the value to the set value does not involve any actual interactive computation.

[0079] For example, the voltage source control chip U1 can be a device or chip with digital signal processing capabilities. For instance, the voltage source control chip U1 can be a DSP (Digital Signal Processing) control chip or a general-purpose processor chip. This invention does not limit it further.

[0080] For example, the voltage source control chip U1 is a DSP control chip. The DSP control chip supports high-speed ADC sampling with a sampling rate of ≥1MHz, and supports fast adjustment of PWM duty cycle with a response time of ≤10μs.

[0081] In this embodiment, by incorporating a high-performance DSP control chip in the power module, its high-speed ADC sampling capability and fast PWM adjustment capability ensure the timeliness of event detection, command generation, and execution. This enables the power module to quickly respond to feedforward boost control commands, complete voltage adjustment within a preset time, achieve closed-loop voltage regulation control, realize constant current output, and ensure the speed and accuracy of compensation, providing hardware support for the stable output current of the DC-DC module. Thus, compensation can be initiated before or simultaneously with actual current changes based on the received feedforward boost control commands, avoiding the delay problem of traditional feedback control. This accurately compensates for rapid current drops caused by load changes and quickly offsets voltage drops caused by sudden load changes, ensuring high stability of the DC-DC module's output current. Ultimately, this provides sufficient adjustment margin for the linear constant current source module, achieving a smooth, drop-free rise in output current. This solves the problem of current drops occurring during the rising edge of the first square wave output current in multi-stage power architectures when the load changes.

[0082] Please refer to Figure 4 The linear constant current source module 833 includes a sixth MOSFET Q6 and a linear constant current source V, wherein: The sixth MOSFET Q6 is connected to the linear constant current source V and the DC-DC module 832 respectively. During the boost duration T, the DC-DC module 832 temporarily increases the preset boost amplitude ΔV, thereby increasing the voltage difference of the sixth MOSFET Q6 and providing sufficient adjustment margin for the linear constant current source V, enabling the linear constant current source V to achieve current control.

[0083] The sixth MOSFET Q6 has a withstand voltage ≥ (rated output voltage of power module 830 + ΔV + 10V), a current capacity ≥ 1.5 times the full load current, and an on-resistance Rds(on) ≤ 50mΩ; for laser pump sources exceeding 500W, a dual MOSFET parallel structure is adopted.

[0084] For example, the sixth MOSFET Q6 can be an NMOSFET. The gate G of the NMOSTFET is connected to the DA signal output terminal, the source S is connected to the linear constant current source V and the DC-DC module 832 respectively, and the drain D is connected to the pump source 850.

[0085] It is understandable that the sixth MOSFET Q6 can also be a PMOSFET. The gate G of the PMOSFET is connected to the DA signal output terminal, the drain D is connected to the linear constant current source V and the DC-DC module 832 respectively, and the source S is connected to the pump source 850.

[0086] The linear constant current source V achieves current control through the sixth MOSFET Q6, which is used to provide a stable and constant current output for the pump source 850. The output current is not affected by input voltage fluctuations or load impedance changes (within the rated range). At the same time, the linear constant current source V achieves current control through the sixth MOSFET Q6, which has linear regulation characteristics.

[0087] In this embodiment, the selection criteria for the sixth MOSFET Q6 are based on its withstand voltage, current capacity, and on-resistance to ensure that it can withstand the voltage stress and full-load current after the boost, thereby reducing conduction losses. In high-power scenarios, a dual MOSFET parallel structure is adopted to further improve the current carrying capacity and heat dissipation performance, prevent the sixth MOSFET Q6 from being damaged due to overload, extend the device life, and improve the reliability of the laser pump source driver 800 in high-power scenarios. By increasing the voltage difference after the power module 830 temporarily increases the preset boost amplitude ΔV, the sixth MOSFET Q6 provides sufficient adjustment margin for the linear constant current source V, enabling the linear constant current source V to achieve current control. This allows the linear constant current source V to provide a stable and constant current output to the load, and the output current is not affected by input voltage fluctuations or load impedance changes.

[0088] It is understood that, in this invention, the functions implemented by the voltage source control chip U1 of the signal detection module 810, the instruction generation module 820, and the power supply module 830 can each be implemented by a separate control chip, or the same control chip can be used to implement the functions of the voltage source control chip U1 of the signal detection module 810, the instruction generation module 820, and the power supply module 830.

[0089] For example, a first control chip can be used to implement the function of the signal detection module 810, a second control chip can be used to implement the function of the instruction generation module 820, and a third control chip can be used to implement the function of the voltage source control chip U1; alternatively, a first control chip can be used to simultaneously implement the functions of the signal detection module 810 and the instruction generation module 820, and a third control chip can be used to implement the function of the voltage source control chip U1; or alternatively, a first control chip can be used to simultaneously implement the functions of the signal detection module 810, the instruction generation module 820, and the voltage source control chip U1. The specific implementation process can be referred to the content described in the above-mentioned related embodiments, and will not be repeated here.

[0090] In one embodiment, the laser pump source driver 800 further includes a temperature compensation module, which integrates a temperature sensor. When the ambient temperature exceeds a preset temperature, the temperature compensation module controls the preset boost amplitude ΔV to automatically increase the preset voltage.

[0091] For example, when the ambient temperature exceeds 40°C, the temperature compensation module controls the preset boost amplitude ΔV to automatically increase by 1V-2V.

[0092] MOSFET characteristics are prone to change under high temperature conditions, which may lead to a decrease in compensation effect. The temperature compensation module automatically increases the preset boost amplitude ΔV to offset the effect of high temperature on MOSFET voltage difference, ensuring that the compensation effect remains stable in a wide temperature range of -20℃ to 60℃, and improving the environmental adaptability of the laser pump source driver 800.

[0093] In one embodiment, the laser pump source driver 800 further includes a multi-protection module, which includes overvoltage protection, overcurrent protection, and / or undervoltage protection. The overvoltage protection trigger condition is that the output voltage of the power module 830 exceeds a preset output voltage threshold (for example, the preset output voltage threshold is the rated voltage of the power module 830 + ΔV + 5V); the overcurrent protection trigger condition is that the current of the sixth MOSFET Q6 in the linear constant current source module 833 exceeds twice the full load current, and the overcurrent protection response time is ≤5μs; the undervoltage protection trigger condition is that the input voltage is lower than AC 85V.

[0094] In this embodiment, a multi-protection module is incorporated into the laser pump source driver. This module includes overvoltage protection, overcurrent protection, and undervoltage protection. Overvoltage protection prevents excessively high output voltage from the DC-DC module 832 in the power supply module from damaging subsequent components. Overcurrent protection quickly cuts off abnormally large currents, preventing the sixth MOSFET Q6 from burning out due to overcurrent. Undervoltage protection suspends compensation when the input voltage is abnormal, avoiding current instability caused by abnormal input voltage operation. This multi-protection mechanism provides comprehensive protection for the laser pump source driver, reducing the risk of failure and improving its safety and lifespan.

[0095] Please refer to Figure 5 and Figure 6 . Figure 5 This is a pulse waveform diagram of the multi-stage power supply architecture circuit before optimization. Figure 6 This is a pulse waveform diagram of the laser pump source driver 800 of the present invention used in a multi-stage power supply architecture circuit.

[0096] from Figure 5 and Figure 6 The comparison shows that: Before the multi-stage power supply architecture circuit was optimized, during the low-frequency first pulse, the constant voltage source loop could not adjust quickly due to the rapid rise of the current, causing the constant voltage source voltage to drop instantly by ΔV to the voltage required when the pump source outputs power. At this time, the current showed a dip, and the required voltage could only be reached after the constant voltage source voltage was adjusted. The overall effect was that the first pulse current could not reach the required current, which could not meet the optical power requirements.

[0097] After optimization using the laser pump source driver 800 of this invention, the multi-stage power supply architecture circuit allows the signal detection module to detect the DA signal set by the load current of the linear constant current source module in real time. When the command generation module detects that the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, it generates a feedforward boost control command and applies the feedforward boost control command to the power supply module. The feedforward boost control command includes a preset boost amplitude ΔV and a boost duration T. After receiving the feedforward boost control command, the power supply module temporarily increases the output voltage by the preset boost amplitude ΔV within the boost duration T, providing adjustment margin for the linear constant current source module in the power supply module. Under this compensation, although the voltage drops by ΔV during the low-frequency first pulse, and although the subsequent circuits still draw a large transient current, the output voltage of the power supply module remains at a high level, ensuring the adjustment margin of the linear constant current source in the linear constant current source module. Ultimately, the output current of the linear constant current source rises smoothly and without dips to the full load current, and the initial pulse current reaches the required current, enabling the laser to start up quickly and smoothly. The overall effect is to meet the optical power requirements during the initial pulse.

[0098] Therefore, the laser pump source driver 800 of the present invention is effective for low-frequency pulses and is safe and reliable.

[0099] Based on the same inventive concept, please refer to Figure 7 The present invention also provides a laser pump source driving method, applied to the laser pump source driver described in any of the above embodiments, the laser pump source driving method comprising: S1, The signal detection module detects the DA signal set by the load current of the power supply module in real time; S2. When the instruction generation module detects that the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, it generates a feedforward boost control instruction and applies the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost magnitude ΔV and a boost duration T. S3. According to the feedforward boost control command, the power module temporarily increases the output voltage by the preset boost amplitude ΔV within the boost duration T. S4. After the boost duration T ends, the instruction generation module generates a command to cancel the feedforward boost control and applies the command to the power supply module. S5. The power module restores the output voltage to the normal value according to the received command to cancel the feedforward boost control.

[0100] In this embodiment, a laser pump source driving method is provided. This method has an adaptive function, which uses a signal detection module to detect the DA signal set by the load current of the power supply module in real time. An instruction generation module is used to generate a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the amplitude of change exceeds a preset amplitude threshold, and applies the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost amplitude ΔV and a boost duration T. According to the feedforward boost control instruction, the power supply module temporarily increases the output voltage by the preset boost amplitude ΔV within the boost duration T, providing adjustment margin for the linear constant current source module in the power supply module. After the boost duration T ends, the instruction generation module generates a command to cancel the feedforward boost control, and the power supply module restores the output voltage to its normal value according to the command to cancel the feedforward boost control. By employing a feedforward boost control mechanism to initiate compensation before or simultaneously with the actual current change when detecting load changes in real-time DA signals, this avoids the delay issues of traditional feedback control. It accurately compensates for rapid current drops caused by load changes and quickly offsets voltage drops caused by sudden load changes, ensuring high stability of the DC-DC converter's output current and sufficient adjustment margin for the linear constant current source module in the power supply module. Ultimately, it achieves a smooth, drop-free rise in output current, meeting the stringent current stability requirements of the laser. The temporary boost design avoids steady-state efficiency loss, eliminates the need for significantly increasing capacitor specifications, reduces hardware costs and equipment size, and balances cost-effectiveness with system efficiency. This solves the problem of current drops occurring during the rising edge of the first square wave output current in multi-stage power supply architectures when the load changes.

[0101] It should be noted that the above method embodiments and driver embodiments belong to the same concept. For details of their implementation process, please refer to the driver embodiments. Furthermore, the technical features in the driver embodiments are also applicable to the method embodiments, and will not be repeated here.

[0102] Based on the same inventive concept, please refer to Figure 8 The present invention also provides a laser, the laser comprising the laser pump source driver 800 described in the first aspect embodiment of the present invention and at least one pump source 850, wherein: The laser pump source driver 800 is connected to the pump source 850 and is used to drive the pump source 850; The pump source 850 is used to emit laser light under drive.

[0103] It should be noted that the above laser embodiment and driver embodiment belong to the same concept. For details of their implementation process, please refer to the driver embodiment. Furthermore, the technical features in the driver embodiment are also applicable to the laser embodiment, and will not be repeated here.

[0104] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0105] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0106] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0107] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A laser pump source driver, characterized in that, include: The module consists of a signal detection module, a command generation module, and a power supply module; among which: The signal detection module is used to detect the DA signal of the load current setting of the power supply module in real time. The instruction generation module, which is connected to the signal detection module and the power supply module respectively, is used to generate a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, and apply the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost magnitude and a boost duration. The power module is configured to temporarily increase the output voltage by the preset boost amplitude during the boost duration according to the feedforward boost control command. The instruction generation module is further configured to generate a command to cancel the feedforward boost control after the boost duration ends, and apply the command to cancel the feedforward boost control to the power supply module; The power module is also used to restore the output voltage to the normal value according to the received command to cancel the feedforward boost control.

2. The laser pump source driver as described in claim 1, characterized in that, The feedforward boost control command is sent to the power supply module through the pulse width modulation output port or analog output port of the command generation module. The transmission path of the feedforward boost control command adopts an isolation module to achieve high and low voltage isolation.

3. The laser pump source driver as described in claim 1, characterized in that, The power supply module includes an AC-DC module, which converts the input AC power into unidirectional pulsating DC power and boosts the power of the unidirectional pulsating DC power to obtain a high-voltage DC bus voltage.

4. The laser pump source driver as described in claim 3, characterized in that, The power supply module further includes: a DC-DC module, a linear constant current source module, and a voltage source control chip. The DC-DC module is used to invert the high-voltage DC bus voltage into a smooth output voltage under the drive of the voltage source control chip and feed it back to the voltage source control chip; at the same time, it outputs the output voltage to the linear constant current source module.

5. The laser pump source driver as described in claim 4, characterized in that, The voltage source control chip is used to receive the feedforward boost control command and the feedback signal of the output voltage, temporarily increase the output voltage of the DC-DC module by the preset boost amplitude during the boost duration, and restore the output voltage of the DC-DC module to the normal value according to the received cancel feedforward boost control command after the boost duration ends.

6. The laser pump source driver as described in claim 4, characterized in that, The linear constant current source module includes a sixth MOSFET and a linear constant current source, wherein: The sixth MOSFET is connected to the linear constant current source and the DC-DC module respectively. During the boost duration, the DC-DC module temporarily increases the preset boost amplitude to increase the voltage difference of the sixth MOSFET and realize current control for the linear constant current source. The linear constant current source is used to provide a stable and constant current output to the pump source.

7. The laser pump source driver as described in claim 1, characterized in that, The laser pump source driver also includes a temperature compensation module, which integrates a temperature sensor. When the ambient temperature exceeds a preset temperature, the temperature compensation module controls the preset boost amplitude to automatically increase the preset voltage.

8. The laser pump source driver as described in claim 1, characterized in that, The laser pump source driver also includes a multi-protection module, which includes overvoltage protection, overcurrent protection, and / or undervoltage protection.

9. A laser pump source driving method, characterized in that, The laser pump source driver according to any one of claims 1 to 8, the laser pump source driving method comprising: The signal detection module detects the DA signal set by the load current of the power supply module in real time; The instruction generation module is used to generate a feedforward boost control instruction when the rate of change of the DA signal exceeds a preset rate of change threshold or the magnitude of change exceeds a preset magnitude of change threshold, and to apply the feedforward boost control instruction to the power supply module. The feedforward boost control instruction includes a preset boost magnitude ΔV and a boost duration T. After receiving the feedforward boost control command, the power module temporarily increases the output voltage by the preset boost amplitude ΔV during the boost duration T. After the boost duration T ends, the instruction generation module generates a command to cancel the feedforward boost control and applies the command to the power supply module. The power module restores the output voltage to its normal value according to the received command to cancel the feedforward boost control.

10. A laser, characterized in that, The laser includes a laser pump source driver as described in any one of claims 1 to 8 and at least one pump source, wherein: The laser pump source driver is connected to the pump source and is used to drive the pump source; The pump source is used to emit laser light under drive.

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