Laser heat dissipation system and method and air-cooled fiber laser

Abstract

The invention discloses a laser heat dissipation system and method and an air-cooled fiber laser, and relates to the technical field of lasers, the disclosed laser heat dissipation system comprises a data acquisition module, a main control module, a fan driving module and a heat dissipation fan, the main control module is electrically connected with the data acquisition module and the fan driving module, and the fan driving module is electrically connected with the heat dissipation fan. The fan driving module is electrically connected with the cooling fan; the data acquisition module is used for acquiring the output power, the input current, the input voltage and the temperature value of the laser; the main control module is used for determining a reference fan control signal according to the output power and correcting the reference fan control signal according to the temperature value and / or an efficiency value calculated through the output power, the input voltage and the input current to obtain a target fan control signal; and the fan driving module is used for controlling the rotating speed of the cooling fan according to the target fan control signal. The heat dissipation efficiency of the laser heat dissipation system can be improved.

Description

Technical Field

[0001] This application relates to the field of laser technology, and in particular to laser heat dissipation systems, methods and air-cooled fiber lasers. Background Technology

[0002] The stability and lifespan of air-cooled fiber lasers depend heavily on the performance of their heat dissipation system. Currently, most mainstream heat dissipation control adopts temperature-based feedback control.

[0003] Temperature-based feedback control involves collecting temperature signals using temperature sensors placed near the laser heatsink or pump source and adjusting the fan speed accordingly. However, when the laser power changes drastically, the temperature change lags behind the power change, resulting in a slow fan response. This can cause the laser to overheat momentarily during a power surge or continue to overcool even after the power decreases, affecting the laser's lifespan.

[0004] In summary, improving the heat dissipation efficiency of laser cooling systems has become a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0005] The main objective of this application is to provide a laser heat dissipation system, method, and air-cooled fiber laser, with the aim of improving the heat dissipation efficiency of the laser heat dissipation system.

[0006] To achieve the above objectives, this application proposes a laser heat dissipation system, which includes: a data acquisition module, a main control module, a fan drive module, and a cooling fan, wherein the main control module is electrically connected to the data acquisition module and the fan drive module, and the fan drive module is electrically connected to the cooling fan. The data acquisition module is used to acquire the laser's output power, input current, input voltage, and temperature value. The main control module is used to determine a reference fan control signal based on the output power, and to correct the reference fan control signal based on the temperature value and / or the efficiency value calculated by the output power, the input voltage and the input current to obtain a target fan control signal. The fan drive module is used to control the speed of the cooling fan according to the target fan control signal.

[0007] In one embodiment, the data acquisition module includes: An output power detection unit is installed at the laser output end of the laser. A temperature detection unit is installed on the pump source or heat sink of the laser. The voltage and current detection unit is installed inside the power supply of the laser.

[0008] In one embodiment, the main control module has a pre-stored reference speed lookup table, and the main control module is further used for: Based on the reference speed lookup table, determine the reference fan control signal corresponding to the output power; The temperature value is compared with a preset first temperature threshold. When the temperature value exceeds the first temperature threshold, the reference fan control signal is positively corrected to obtain the first target fan control signal.

[0009] In one embodiment, the main control module has a pre-stored standard efficiency comparison table, and the main control module is further used for: The efficiency value is calculated based on the output power, the input voltage, and the input current. Based on the standard efficiency comparison table, determine the theoretical efficiency value corresponding to the output power; When the temperature value does not exceed the first temperature threshold, the efficiency value is compared with the theoretical efficiency value; When the efficiency value is less than the theoretical efficiency value and the difference reaches a preset threshold, the reference fan control signal is positively corrected to obtain the second target fan control signal.

[0010] In one embodiment, the main control module is further configured to: The temperature value is compared with a preset second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold; When the temperature value exceeds the second temperature threshold, the reference fan control signal is positively corrected to obtain a third target fan control signal, which is used to control the cooling fan to run at its maximum speed.

[0011] In one embodiment, the data acquisition module is further configured to acquire the optical power signal of the laser; The main control module is also used to control the laser to shut down when the optical power signal is detected to be lower than a preset optical power threshold.

[0012] In one embodiment, the data acquisition module includes: An optical power detection unit is installed in the optical fiber or optical path of the laser.

[0013] Furthermore, to achieve the above objectives, this application also proposes a laser heat dissipation method, applied to the laser heat dissipation system described above, the laser heat dissipation method comprising: The data acquisition module acquires the laser's output power, input current, input voltage, and temperature values. The main control module determines the reference fan control signal based on the output power, and corrects the reference fan control signal based on the temperature value and / or the efficiency value calculated by the output power, the input voltage and the input current to obtain the target fan control signal. The fan drive module controls the speed of the cooling fan according to the target fan control signal.

[0014] In one embodiment, the main control module pre-stores a reference speed lookup table and a standard efficiency lookup table. The step of determining a reference fan control signal based on the output power through the main control module, and correcting the reference fan control signal based on the temperature value and / or the efficiency value calculated using the output power, the input voltage, and the input current to obtain the target fan control signal includes: Based on the reference speed lookup table, determine the reference fan control signal corresponding to the output power; The efficiency value is calculated based on the output power, the input voltage, and the input current. Based on the standard efficiency comparison table, determine the theoretical efficiency value corresponding to the output power; The temperature value is compared with a preset first temperature threshold. When the temperature value exceeds the first temperature threshold, the reference fan control signal is positively corrected to obtain the first target fan control signal; When the temperature value does not exceed the first temperature threshold, the efficiency value is compared with the theoretical efficiency value; When the efficiency value is less than the theoretical efficiency value and the difference reaches a preset threshold, the reference fan control signal is positively corrected to obtain the second target fan control signal.

[0015] In addition, to achieve the above objectives, this application also proposes an air-cooled fiber laser, which includes the laser heat dissipation system as described above.

[0016] This application proposes a laser heat dissipation system, which includes: a data acquisition module, a main control module, a fan drive module, and a cooling fan. The main control module is electrically connected to both the data acquisition module and the fan drive module, and the fan drive module is electrically connected to the cooling fan. The data acquisition module is used to acquire the laser's output power, input current, input voltage, and temperature. The main control module is used to determine a reference fan control signal based on the output power, and to correct the reference fan control signal based on the temperature value and / or an efficiency value calculated from the output power, input voltage, and input current to obtain a target fan control signal. The fan drive module is used to control the speed of the cooling fan according to the target fan control signal.

[0017] In summary, the laser heat dissipation system of this application acquires multi-dimensional parameters such as the laser's output power, input current, input voltage, and temperature through a data acquisition module. The main control module determines the reference fan control signal based on the output power. Then, by comprehensively considering the temperature value and the efficiency value calculated from the output power, input voltage, and input current, the reference fan control signal is corrected to obtain a more accurate target fan control signal. The fan drive module controls the speed of the cooling fan according to the target fan control signal, thereby enabling a more timely and accurate response to changes in laser power. This effectively avoids the problem of slow fan response caused by temperature changes lagging behind power changes, and improves the heat dissipation efficiency of the laser heat dissipation system. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the module structure provided in Embodiment 1 of the laser heat dissipation system of this application; Figure 2 This is a schematic diagram of the overall system architecture provided in Embodiment 1 of the laser heat dissipation system of this application; Figure 3 This is a schematic diagram of the control flow provided in Embodiment 1 of the laser heat dissipation system of this application; Figure 4 This is a schematic flowchart of a laser heat dissipation method according to an embodiment of this application; Figure 5 This is another schematic diagram of the laser heat dissipation method in the embodiments of this application.

[0021] Figures 1 to 2 Explanation of icon numbers:

[0022] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0024] The stability and lifespan of air-cooled fiber lasers depend heavily on the performance of their heat dissipation system. Currently, most mainstream heat dissipation control adopts temperature-based feedback control.

[0025] Temperature-based feedback control involves collecting temperature signals using temperature sensors placed near the laser heatsink or pump source and adjusting the fan speed accordingly. However, when the laser power changes drastically, the temperature change lags behind the power change, resulting in a slow fan response. This can cause the laser to overheat momentarily during a power surge or continue to overcool even after the power decreases, affecting the laser's lifespan.

[0026] In summary, improving the heat dissipation efficiency of laser cooling systems has become a pressing technical problem that needs to be solved in this field.

[0027] This application provides a solution for a laser heat dissipation system, comprising: a data acquisition module, a main control module, a fan drive module, and a cooling fan. The main control module is electrically connected to both the data acquisition module and the fan drive module, and the fan drive module is electrically connected to the cooling fan. The data acquisition module acquires the laser's output power, input current, input voltage, and temperature. The main control module determines a reference fan control signal based on the output power and corrects the reference fan control signal based on the temperature value and / or an efficiency value calculated from the output power, input voltage, and input current to obtain a target fan control signal. The fan drive module controls the speed of the cooling fan according to the target fan control signal.

[0028] In summary, the laser heat dissipation system in this embodiment acquires multi-dimensional parameters such as the laser's output power, input current, input voltage, and temperature through a data acquisition module. The main control module determines a reference fan control signal based on the output power. Then, by comprehensively considering the temperature value and the efficiency value calculated from the output power, input voltage, and input current, the reference fan control signal is corrected to obtain a more accurate target fan control signal. The fan drive module controls the speed of the cooling fan based on this target fan control signal, thereby enabling a more timely and accurate response to changes in laser power. This effectively avoids the problem of slow fan response caused by temperature changes lagging behind power changes, and improves the heat dissipation efficiency of the laser heat dissipation system.

[0029] Based on this, embodiments of this application provide a laser heat dissipation system, referring to... Figure 1 , Figure 1 This is a schematic diagram of the module structure of the first embodiment of the laser heat dissipation system of this application.

[0030] In this embodiment, the laser heat dissipation system includes: a data acquisition module 10, a main control module 20, a fan drive module 30, and a cooling fan 40. The main control module 20 is electrically connected to the data acquisition module 10 and the fan drive module 30, respectively, and the fan drive module 30 is electrically connected to the cooling fan 40. Data acquisition module 10 is used to acquire the output power, input current, input voltage and temperature values ​​of the laser; In this embodiment, a laser heat dissipation system is installed in the air-cooled fiber laser (hereinafter referred to as the laser) to dissipate heat from the laser body. The laser heat dissipation system includes a data acquisition module 10, a main control module 20, a fan drive module 30, and a cooling fan 40. The main control module 20 is electrically connected to the data acquisition module 10 and the fan drive module 30, respectively, and the fan drive module 30 is electrically connected to the cooling fan 40. The data acquisition module 10 is used to acquire the output power, input current, input voltage, and temperature values ​​during the operation of the laser. The acquisition method can be periodic acquisition at certain time intervals or real-time acquisition, which can be selected according to the actual application scenario. In this embodiment, the acquisition method is not specifically limited.

[0031] The main control module 20 is used to determine the reference fan control signal based on the output power, and to correct the reference fan control signal based on the temperature value and / or the efficiency value calculated by the output power, input voltage and input current to obtain the target fan control signal. In this embodiment, the main control module 20 receives parameters such as output power, input current, input voltage, and temperature value transmitted by the data acquisition module 10, and determines the target fan control signal based on these parameters. Specifically, firstly, the main control module 20 determines a reference fan control signal based on the received output power. This reference fan control signal is the duty cycle of a PWM (Pulse Width Modulation) signal or an analog voltage value, corresponding to a fan speed that can meet the basic heat dissipation requirements under that output power. Then, the reference fan control signal is corrected based on the temperature value to obtain the target fan control signal; or, the reference fan control signal is corrected based on the efficiency value calculated from the output power, input voltage, and input current to obtain the target fan control signal; or, the reference fan control signal is corrected based on the temperature value and the calculated efficiency value to obtain the target fan control signal.

[0032] The fan drive module 30 is used to control the speed of the cooling fan 40 according to the target fan control signal.

[0033] In this embodiment, the fan drive module 30 receives the target fan control signal transmitted by the main control module 20, and converts the target fan control signal into a drive signal with sufficient power and current to drive the cooling fan 40 motor, thereby realizing the adjustment of the speed of the cooling fan 40.

[0034] In one feasible embodiment, the data acquisition module 10 includes: The output power detection unit 101 is installed at the laser output end of the laser; Temperature detection unit 102 is installed on the pump source or heat sink of the laser; The voltage and current detection unit 103 is installed inside the power supply of the laser.

[0035] In this embodiment, the output power detection unit 101 is installed at the laser output end and can convert the output laser into an electrical signal reflecting the output power of the laser; the temperature detection module can specifically be an NTC (Negative Temperature Coefficient) thermistor, which is installed on the pump source, heat sink or other main heat-generating device of the laser to sense the internal temperature of the laser; the voltage and current detection unit 103 is usually composed of a sampling resistor and an operational amplifier, and is installed inside the power supply of the laser to measure the input voltage and input current required to drive the laser.

[0036] In addition, in one feasible implementation, multiple temperature detection units 102 can be set and installed in multiple locations such as the pump source and heat sink of the laser. The main control module 20 takes the maximum value or average value among them to participate in the control, so as to effectively monitor the overall temperature condition inside the laser.

[0037] In addition, the main control module 20 performs a sensor self-test process when the system starts up. If any sensor signal is detected to be abnormal, it will automatically switch to the backup control strategy: if the temperature detection unit 102 fails, the fan will be controlled only based on the output power and efficiency value; if the sensor required for efficiency calculation is abnormal, it will switch to the dual-parameter control mode of output power + temperature to ensure that the system can still operate safely when some sensors fail.

[0038] In one feasible embodiment, the main control module 20 has a pre-stored reference speed lookup table, and the main control module 20 is also used for: Based on the reference speed lookup table, determine the reference fan control signal corresponding to the output power; Compare the temperature value with a preset first temperature threshold; When the temperature exceeds the first temperature threshold, the reference fan control signal is positively corrected to obtain the first target fan control signal.

[0039] It should be noted that the reference speed lookup table establishes a mapping relationship between the laser output power and the reference fan control signal (such as PWM duty cycle). When the main control module 20 is running, the current output power is read, and a corresponding reference fan control signal can be quickly obtained by looking up the table. The first temperature threshold is a preset temperature threshold value, which is lower than the maximum allowable operating temperature of the laser.

[0040] The main control module 20 continuously reads the temperature value and compares it with the first temperature threshold. Once the temperature value exceeds the first temperature threshold, it triggers the correction of the reference fan control signal. Positive correction means increasing the heat dissipation intensity. Specifically, it can be done by adding a fixed percentage (e.g., +10%) to the reference PWM duty cycle, or by increasing it proportionally according to the temperature value that exceeds the threshold. The control signal obtained after this correction is the first target fan control signal.

[0041] Therefore, when the heat dissipation system's heat dissipation efficiency decreases due to factors such as increased ambient temperature or slight blockage of the air duct, it can detect this change in a timely manner and enhance cooling to prevent the temperature from rising further to a dangerous level.

[0042] In addition, in one feasible implementation, the main control module 20 is also used to calculate the rate of change of temperature value per unit time, and when the rate of change of temperature exceeds a preset rate of change threshold, to perform advance correction on the reference fan control signal. Even if the current temperature does not exceed the first temperature threshold, the speed of the cooling fan is increased in advance to cope with the instantaneous heat generation caused by the sharp increase in laser power.

[0043] Furthermore, the main control module 20 is also used to dynamically update the reference speed lookup table based on the system's operating data under stable conditions. Specifically, during long-term operation, the system continuously records data points under stable conditions based solely on output power control without triggering any temperature or efficiency corrections. These data points include output power, ambient temperature, and the final stabilized cooling fan speed. The main control module 20 can periodically perform statistical analysis on these high-quality data points and fine-tune the mapping relationship in the reference speed lookup table using moving average or linear regression algorithms. For example, if it is found that under specific output power and ambient temperature, the system ultimately adopts a speed higher than the reference value in the original table to maintain stability, the main control module 20 will correspondingly increase the reference fan control signal value corresponding to that power point. This allows the laser cooling system to adapt to performance changes caused by long-term laser use or differences in different operating environments, always maintaining optimal reference cooling performance.

[0044] In one feasible embodiment, the main control module 20 has a standard efficiency comparison table pre-stored inside, and the main control module 20 is also used for: The efficiency value is calculated based on the output power, input voltage, and input current. Based on the standard efficiency comparison table, determine the theoretical efficiency value corresponding to the output power; When the temperature value does not exceed the first temperature threshold, the efficiency value is compared with the theoretical efficiency value; When the efficiency value is less than the theoretical efficiency value and the difference reaches a preset threshold, the reference fan control signal is positively corrected to obtain the second target fan control signal.

[0045] It should be noted that the standard efficiency reference table records the theoretical photoelectric conversion efficiency values ​​corresponding to different output powers of the laser when it is in factory or good condition. When the main control module 20 is running, the current output power is read, and a corresponding theoretical efficiency value can be quickly obtained by looking up the table. The preset threshold is an efficiency deviation tolerance, which can be set according to the actual application scenario.

[0046] If the temperature value does not exceed the first temperature threshold, it indicates that the system has not overheated due to external reasons. The main control module 20 compares the obtained efficiency value with the theoretical efficiency value. If the efficiency value is less than the theoretical efficiency value and the difference between the efficiency value and the theoretical efficiency value reaches the preset threshold, the laser health status is determined to be abnormal. This abnormality usually means that there is additional, unexpected energy loss converted into heat. At this time, the main control module 20 performs positive correction on the reference fan control signal. The correction magnitude can be proportional to the magnitude of efficiency decrease. The fan control signal obtained after this correction is the second target fan control signal.

[0047] Therefore, by monitoring the efficiency value, early signs of efficiency decline can be detected before the laser output power and temperature value show significant deterioration. The impact can be mitigated by adjusting the fan speed, and an early warning can be issued to prompt maintenance.

[0048] In addition, in one feasible implementation, the main control module 20 is also used to record historical efficiency values ​​and establish an efficiency change trend model. When the efficiency value is detected to be decreasing for multiple consecutive sampling periods, even if the current efficiency value is not lower than the theoretical efficiency value or the difference does not exceed the preset threshold, a preventive positive correction of the reference fan control signal is initiated, and the state is recorded as a basis for laser health assessment.

[0049] In one feasible embodiment, the main control module 20 is further configured to: The temperature value is compared with a preset second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold; When the temperature exceeds the second temperature threshold, the reference fan control signal is positively corrected to obtain the third target fan control signal, which is used to control the cooling fan 40 to run at its maximum speed.

[0050] It should be noted that the second temperature threshold is usually set to be close to or equal to the laser's maximum safe operating temperature or critical damage temperature, and this second temperature threshold is greater than the first temperature threshold.

[0051] The main control module 20 continuously compares the temperature value with the second temperature threshold. Once the temperature value exceeds the second temperature threshold, indicating that the laser is in danger of overheating, the main control module 20 will override all other control logic and directly perform positive correction on the reference fan control signal to directly generate a third target fan control signal. This third target fan control signal instructs the cooling fan 40 to run at its maximum speed allowed by its technical specifications. At the same time, the main control module 20 usually triggers an emergency stop alarm signal to prevent the laser from burning out due to overheating.

[0052] In addition, in one feasible implementation, the main control module 20 executes a speed smoothing algorithm before outputting the target fan control signal to ensure that the change in fan speed within adjacent control cycles does not exceed the preset maximum change step size, thereby avoiding mechanical vibration or noise caused by sudden changes in speed and extending the fan's service life.

[0053] In one feasible embodiment, the data acquisition module 10 is further configured to acquire the optical power signal of the laser; The main control module 20 is also used to control the laser to shut down when the detected optical power signal is lower than the preset optical power threshold.

[0054] In this embodiment, the data acquisition module 10 periodically or in real-time acquires the optical power signal of the laser, which reflects the light transmission status of the internal optical links of the laser. The main control module 20 compares the optical power signal with a preset optical power threshold, which is a low optical power threshold. When the optical power signal is detected to be lower than the preset optical power threshold, it means that the optical fiber is broken or a certain optical component is severely misaligned. In these cases, if the pump source is still working, the energy it generates cannot be effectively extracted as laser light and will be converted into heat energy, which may cause thermal damage to the relevant optical components in a very short time. Therefore, when the main control module 20 detects that the optical power signal is lower than the preset optical power threshold, it immediately executes the operation of controlling the laser to shut down, usually by cutting off the driving current of the pump source, so as to achieve rapid protection against failures in the internal optical system of the laser.

[0055] In one feasible embodiment, the data acquisition module 10 includes: The optical power detection unit 104 is installed in the optical fiber or optical path of the laser.

[0056] In this embodiment, the optical power detection unit 104 can be a photodetector located near the optical fiber or optical components of the laser, used to monitor the optical path power inside the laser.

[0057] For example, in a feasible implementation scenario, the overall architecture diagram of the laser heat dissipation system is as follows: Figure 2 As shown, the laser heat dissipation system includes a data acquisition module 10, a main control module 20, a fan drive module 30, and a cooling fan 40. The main control module 20 is electrically connected to both the data acquisition module 10 and the fan drive module 30, and the fan drive module 30 is electrically connected to the cooling fan 40. The data acquisition module 10 includes an output power detection unit 101, an optical power detection unit 104, a temperature detection unit 102, and a voltage and current detection unit 103. The output power detection unit 101 is used to acquire the final output power signal of the laser in real time. The optical power detection unit 104 is used to acquire the optical power signal inside the laser (preferably in an optical fiber or optical component) in real time. The temperature detection unit 102 is located on the heat sink, pump source, or optical component and is used to acquire the temperature signal in real time. The voltage and current detection unit 103 is used to acquire the laser input current and voltage signals in real time. The main control module 20 has a pre-stored standard efficiency comparison table and a reference speed comparison table. According to the table, the main control module 20 executes the following algorithms: 1. Efficiency calculation and monitoring: Based on the detected output power and voltage / current signals, the efficiency value η of the laser is calculated in real time as η = output power / input voltage * input current; 2. Reference control: The output power signal is received, and a reference fan control signal is calculated based on the reference speed reference table; 3. Temperature correction: The real-time temperature value is received and compared with a preset first temperature threshold; if the temperature value exceeds the first temperature threshold, the reference fan control signal is positively corrected, such as by increasing it by a certain percentage; 4. Efficiency correction and fault warning: The calculated real-time efficiency value η is compared with the theoretical efficiency value in the standard efficiency reference table; if the real-time efficiency η is significantly lower than the theoretical efficiency value, for example, more than 5%, it is determined that there may be abnormal heating inside the laser (such as aging or contamination of optical components), and the main control module 20 positively corrects the reference fan control signal (such as by increasing it by a certain percentage) and outputs a warning signal.

[0058] The fan drive module 30 drives the cooling fan 40 to run at the corresponding speed according to the target fan control signal finally output by the main control module 20.

[0059] When the real-time temperature exceeds the preset maximum safe temperature threshold, the main control module 20 ignores all other parameters and directly outputs a PWM signal with the maximum duty cycle to drive the fan to run at full speed and trigger an emergency stop alarm. At the same time, the main control module 20 communicates with the host computer or human-machine interface to report real-time data, early warning information, and fault codes.

[0060] The beneficial effects of this example are as follows: (a) Multi-level monitoring and coordinated control: Innovatively combining output power (feedforward control), temperature (feedback control), optical power (health status monitoring), voltage and current (health status monitoring). Output power ensures rapid response, temperature monitoring provides safety redundancy, and optical power monitoring, voltage and current can reflect the health status of the laser, realizing multi-dimensional control; (b) Breaking through the thermal delay bottleneck: With output power as the main control basis, feedforward control that is almost synchronous with the change of heat source is realized, fundamentally eliminating the lag of temperature control; (c) Possesses fault prediction and health management (PHM) capabilities: By monitoring photoelectric conversion efficiency in real time, it can detect the efficiency decline and abnormal heat generation trend caused by component aging, contamination, etc. in advance, strengthen heat dissipation in advance, and take measures in fan control. At the same time, it issues early warnings, changing "post-event remediation" to "pre-event prevention", which greatly improves the reliability and maintainability of the equipment. (d) Safety redundancy: Temperature monitoring serves as the ultimate safety barrier, together forming a deep defense system with security far exceeding any single control scheme; (e) Energy saving and self-adaptation: Under the premise of ensuring heat dissipation, the system can automatically adapt to the laser's own state (such as efficiency decay) and environmental changes (such as the rise in ambient temperature), and always provide precise cooling airflow to achieve the effects of energy saving, noise reduction and extended fan life.

[0061] For example, in a feasible implementation scenario, the control flow of the main control module 20 is as follows: Figure 3 As shown: (a) Real-time acquisition of output power P_out, input voltage V_in, input current I_in, and temperature T; (b) Calculate the input power P_in = V_in * I_in, and the real-time efficiency η = P_out / P_in; (c) Query the standard efficiency comparison table to obtain the theoretical efficiency η_std under the current P_out; (d) Determine whether the real-time temperature is higher than the maximum safe temperature threshold (T>T_max, the maximum safe temperature threshold is the second temperature threshold). If yes, the fan runs at full speed and an alarm is reported; otherwise, continue. (e) Query the output power-reference speed lookup table according to P_out to obtain the reference PWM value, which is the reference fan control signal; (f) Determine whether the real-time temperature is higher than the high temperature alarm threshold (T>T_warn, the high temperature alarm threshold is the first temperature threshold). If so, make a positive correction to the base PWM value (e.g., +10%). (g) Determine if η < η_std -Δη (efficiency deviation tolerance). If so, determine if the efficiency is abnormal, perform a positive correction on the reference PWM value (e.g. +15%), and send a warning signal "laser efficiency decreases, maintenance recommended". (h) Output the corrected final PWM value to the fan drive circuit to control the fan speed; (i) Repeat the above steps.

[0062] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the laser heat dissipation system of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0063] This application also provides a laser heat dissipation method, which is applied to the laser heat dissipation system described in the above embodiments. Please refer to... Figure 4 The laser heat dissipation method includes steps S10~S30: Step S10: Obtain the output power, input current, input voltage, and temperature of the laser through the data acquisition module; Step S20: The main control module determines the reference fan control signal based on the output power, and corrects the reference fan control signal based on the temperature value and / or the efficiency value calculated by the output power, input voltage and input current to obtain the target fan control signal. Step S30: The fan drive module controls the speed of the cooling fan according to the target fan control signal.

[0064] In this embodiment, the laser heat dissipation system uses a data acquisition module to collect the laser's output power, input current, input voltage, and real-time temperature values ​​during operation, providing a data foundation for subsequent intelligent control. Then, the laser heat dissipation system uses a main control module to calculate the target fan control signal used to drive the cooling fan based on the collected data. Finally, the laser heat dissipation system uses a fan drive module to receive the target fan control signal sent by the main control module and controls the speed of the cooling fan accordingly, thus completing the intelligent heat dissipation management of the laser.

[0065] This allows for a more timely and accurate response to changes in laser power, effectively avoiding the problem of slow fan response caused by temperature changes lagging behind power changes, and improving the heat dissipation efficiency of the laser cooling system.

[0066] In one feasible embodiment, such as Figure 5 As shown, step S20 may include steps S201 to S207: Step S201: Based on the reference speed lookup table, determine the reference fan control signal corresponding to the output power; Step S202: Calculate the efficiency value based on the output power, input voltage, and input current; Step S203: Based on the standard efficiency comparison table, determine the theoretical efficiency value corresponding to the output power; Step S204: Compare the temperature value with a preset first temperature threshold. Step S205: When the temperature value exceeds the first temperature threshold, the reference fan control signal is positively corrected to obtain the first target fan control signal. Step S206: When the temperature value does not exceed the first temperature threshold, compare the efficiency value with the theoretical efficiency value; Step S207: When the efficiency value is less than the theoretical efficiency value and the difference reaches a preset threshold, the reference fan control signal is positively corrected to obtain the second target fan control signal.

[0067] In this embodiment, the main control module will query a preset reference speed lookup table and directly determine a corresponding reference fan control signal based on the collected output power. At the same time, the main control module will use the collected output power, input voltage and input current to calculate the current actual efficiency value of the laser, and query another preset standard efficiency lookup table to find the theoretical efficiency value that the laser should theoretically achieve at the current output power.

[0068] Then, the collected temperature value is compared with the preset first temperature threshold. If the temperature value exceeds the first temperature threshold, the reference fan control signal is immediately positively corrected to generate the first target fan control signal, that is, to increase the speed of the cooling fan to enhance the heat dissipation capacity.

[0069] If the temperature value does not exceed the first temperature threshold, the system enters the efficiency monitoring stage, which compares the calculated actual efficiency value with the theoretical efficiency value. When the actual efficiency value is less than the theoretical efficiency value and the difference between the two reaches the preset threshold, it indicates that the laser may experience a decrease in efficiency due to internal heat. At this time, the system will also positively correct the reference fan control signal and generate a second target fan control signal to improve the heat dissipation intensity.

[0070] The laser heat dissipation method provided in this application, employing the laser heat dissipation system described in the above embodiments, can improve the heat dissipation efficiency of the laser heat dissipation system. Compared with the prior art, the beneficial effects of the laser heat dissipation method provided in this application are the same as those of the laser heat dissipation system provided in the above embodiments, and other technical features in the laser heat dissipation method are the same as those disclosed in the laser heat dissipation system of the above embodiments, and will not be repeated here.

[0071] This application also proposes an air-cooled fiber laser, which includes the laser heat dissipation system as described in the above embodiments.

[0072] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A laser heat dissipation system, characterized in that, The laser heat dissipation system comprises a data acquisition module, a main control module, a fan driving module and a heat dissipation fan, wherein the main control module is electrically connected with the data acquisition module and the fan driving module respectively, and the fan driving module is electrically connected with the heat dissipation fan; The data acquisition module is configured to acquire the output power, input current, input voltage and temperature value of the laser; The main control module is configured to determine a reference fan control signal according to the output power, and correct the reference fan control signal according to the temperature value and / or an efficiency value calculated by the output power, the input voltage and the input current, to obtain a target fan control signal; The fan driving module is configured to control the rotating speed of the heat dissipation fan according to the target fan control signal.

2. The laser heat dissipation system of claim 1, wherein, The data acquisition module comprises: an output power detection unit installed at the laser output end of the laser; a temperature detection unit installed on the pump source or heat sink of the laser; a voltage and current detection unit installed in the power supply of the laser.

3. The laser heat dissipation system of claim 1, wherein, The main control module has a reference rotating speed reference table pre-stored therein, and the main control module is further configured to: determine the reference fan control signal corresponding to the output power based on the reference rotating speed reference table; compare the temperature value with a preset first temperature threshold value; positively correct the reference fan control signal when the temperature value exceeds the first temperature threshold value, to obtain a first target fan control signal.

4. The laser heat dissipation system of claim 3, wherein, The main control module has a standard efficiency reference table pre-stored therein, and the main control module is further configured to: calculate an efficiency value according to the output power, the input voltage and the input current; determine a theoretical efficiency value corresponding to the output power based on the standard efficiency reference table; compare the efficiency value with the theoretical efficiency value when the temperature value does not exceed the first temperature threshold value; positively correct the reference fan control signal when the efficiency value is less than the theoretical efficiency value and the difference reaches a preset threshold value, to obtain a second target fan control signal.

5. The laser heat dissipation system of any one of claims 1 to 4, wherein, The main control module is further configured to: compare the temperature value with a preset second temperature threshold value, wherein the second temperature threshold value is greater than the first temperature threshold value; positively correct the reference fan control signal when the temperature value exceeds the second temperature threshold value, to obtain a third target fan control signal, wherein the third target fan control signal is used to control the heat dissipation fan to operate at the maximum rotating speed.

6. The laser heat dissipation system of any one of claims 1 to 4, wherein: the data acquisition module is further configured to acquire an optical power signal of the laser; the main control module is further configured to control the laser to be turned off when it is detected that the optical power signal is lower than a preset optical power threshold value.

7. The laser heat dissipation system of claim 6, wherein, The data acquisition module comprises: an optical power detection unit installed in the optical path of the optical fiber or optical component of the laser.

8. A method of dissipating heat from a laser, comprising: The laser heat dissipation method is applied to the laser heat dissipation system of any one of claims 1 to 7, and the laser heat dissipation method comprises: The data acquisition module acquires the output power, input current, input voltage and temperature value of the laser; The main control module determines a reference fan control signal according to the output power, and corrects the reference fan control signal according to the temperature value and / or an efficiency value calculated by the output power, the input voltage and the input current, to obtain a target fan control signal; The fan driving module controls the rotating speed of the cooling fan according to the target fan control signal.

9. The method of claim 8, wherein the laser is a diode laser. The main control module has a reference rotating speed reference table and a standard efficiency reference table pre-stored therein, and the step of determining a reference fan control signal according to the output power, and correcting the reference fan control signal according to the temperature value and / or an efficiency value calculated by the output power, the input voltage and the input current, to obtain a target fan control signal, includes: determining the reference fan control signal corresponding to the output power based on the reference rotating speed reference table; calculating an efficiency value according to the output power, the input voltage and the input current; determining a theoretical efficiency value corresponding to the output power based on the standard efficiency reference table; comparing the temperature value with a preset first temperature threshold value; positively correcting the reference fan control signal to obtain a first target fan control signal when the temperature value exceeds the first temperature threshold value; comparing the efficiency value with the theoretical efficiency value when the temperature value does not exceed the first temperature threshold value; positively correcting the reference fan control signal to obtain a second target fan control signal when the efficiency value is less than the theoretical efficiency value and the difference reaches a preset threshold value.

10. An air-cooled fiber laser, characterized by, The air-cooled fiber laser comprises the laser cooling system according to any one of claims 1 to 7.

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