Temperature control method and device of laser and medium

Abstract

The invention discloses a temperature control method and device for a laser and a medium, and relates to the technical field of temperature control, and the method comprises the steps: obtaining the operation parameters of a pump source assembly in a laser system, and carrying out the data query and interpolation calculation through a predefined current heat mapping table based on the pump source current in the operation parameters, and generating a thermal load prediction value; based on the thermal load predicted value and according to the working mode of the laser, a refrigeration control signal is generated, and the refrigeration control signal is sent to an execution component of the refrigeration system so as to control at least one of the rotating speed of a compressor, the opening degree of an expansion valve and the rotating speed of a fan; and calculating a current fine tuning coefficient according to the difference between a target temperature value in the thermal load predicted value and an actual temperature value, performing overall current compensation according to the difference between a power set value in the thermal load predicted value and an actual power value, and outputting an independent current adjustment value and a total current adjustment value of each pump source assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control, in particular to a temperature control method, device and medium for a laser. BACKGROUND

[0002] A high-power laser generates a large amount of heat during operation. If temperature control is not performed in time and effectively, the stability of laser output, beam quality and device life will be directly affected. At present, an independent external water chiller is generally used to cool the laser system in the industry. This scheme designs the laser system and the refrigeration system as two independent devices, and connects them physically through an external circulation pipeline. This separate structure results in a large overall floor area of the device, complex installation and arrangement, and obvious short boards in system cooperative control.

[0003] Since the laser system and the refrigeration system have independent control logic and information processing units respectively, there is a lack of deep data interaction and cooperative mechanism between them. The existing temperature control system mainly relies on the lag feedback of the temperature of the key parts of the laser. The refrigeration system can only start the corresponding cooling or heating operation after detecting the change of the temperature sensor signal, and cannot predict the thermal load change of the laser in advance. In actual operation of the high-power laser, the laser output power often presents a millisecond-level transient jump, and the internal heat generation and disappearance are also transient. The traditional temperature control system responds slowly, so that the refrigeration capacity cannot match the thermal load in real time, resulting in overshoot or insufficient adjustment, which seriously affects the temperature control precision and system efficiency. SUMMARY

[0004] The embodiments of the present application provide a temperature control method, device and medium for a laser to solve the above technical problems.

[0005] In one aspect, the embodiments of the present application provide a temperature control method for a laser, comprising: obtaining the operating parameters of the pump source assembly in the laser system, and based on the pump source current in the operating parameters, performing data query and interpolation calculation through a predefined current-heat mapping table to generate a thermal load prediction value; the operating parameters include pump source current, actual temperature value and actual power value; based on the thermal load prediction value, and according to the working mode of the laser, generating a refrigeration control signal, and sending the refrigeration control signal to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed; the working mode includes an emergency cooling mode, an emergency heating mode and a normal mode; A current fine-tuning coefficient is calculated according to the difference between the target temperature value in the thermal load prediction value and the actual temperature value, and overall current compensation is performed according to the difference between the power set value in the thermal load prediction value and the actual power value, and an independent current adjustment value and a total current adjustment value of each pump source component are output.

[0006] In an implementation manner of the present application, based on the pump source current in the operating parameter, a thermal load prediction value is generated through data query and interpolation calculation based on a predefined current-heat mapping table, and specifically includes: A current-heat mapping table is established, and the pump source current in the operating parameter is read; the current-heat mapping table stores the correlation between a plurality of current values and corresponding actual power values in the form of a two-dimensional array; Based on the pump source current, the current-heat mapping table is accessed to extract adjacent current reference points and actual power values corresponding to the adjacent current reference points in the current-heat mapping table, and based on the position of the pump source current between the adjacent current reference points, an interpolation proportion coefficient is calculated; The interpolation proportion coefficient is applied to weighted summation of adjacent actual power values to generate an interpolation thermal load value, and the interpolation thermal load value is superimposed with a reference thermal load value to generate a thermal load prediction value corresponding to the pump source current.

[0007] In an implementation manner of the present application, based on the thermal load prediction value, a refrigeration control signal is generated according to the working mode of the laser, and the refrigeration control signal is sent to an execution component of a refrigeration system to control at least one of compressor speed, expansion valve opening degree and fan speed, and specifically includes: In the case that the working mode of the laser is a rapid cooling mode, a rapid cooling control signal is generated based on the thermal load prediction value; the rapid cooling control signal includes a first compressor speed control instruction, a first expansion valve control instruction and a first fan control instruction; The first compressor speed control instruction is sent to a compressor component of the refrigeration system to increase the compressor component speed to a preset first high speed based on the thermal load prediction value; The first expansion valve control instruction is sent to a first expansion valve component of the refrigeration system to increase the opening degree of the first expansion valve component to the maximum value; The first fan control instruction is sent to a fan component of the refrigeration system to control the fan component speed to the maximum speed; When the rapid cooling control signal is executed, the pump source current and the temperature of the key position are continuously monitored, and when the temperature of the refrigerant flowing to the pump source component is lower than a first threshold value, the first expansion valve control instruction is adjusted to reduce the opening degree of the first expansion valve.

[0008] In an implementation form of the application, based on the thermal load prediction value, and according to the working mode of the laser, a refrigeration control signal is generated, and the refrigeration control signal is sent to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed, specifically including: In the case where the working mode of the laser is the rapid temperature rise mode, a rapid temperature rise control signal is generated based on the thermal load prediction value; the rapid temperature rise control signal includes a second compressor speed control instruction, a second expansion valve control instruction and a second fan control instruction; The second compressor speed control instruction is sent to the compressor assembly of the refrigeration system to reduce the compressor assembly speed to a second preset low speed standby state based on the thermal load prediction value; The second expansion valve control instruction is sent to the first expansion valve assembly and the second expansion valve assembly of the refrigeration system, and after confirming that the thermal load continues to be lower than the preset low level thermal load threshold for a predetermined delay time, the opening degree of the first expansion valve assembly is reduced to a closed state, and the opening degree of the second expansion valve assembly is increased to a maximum value, so as to guide the remaining cold quantity of the refrigeration system to the water tank assembly for storage; The second fan control instruction is sent to the fan assembly of the refrigeration system, and the fan assembly speed is controlled to zero speed or minimum speed to reduce the heat dissipation of the laser system.

[0009] In an implementation form of the application, after the refrigeration control signal is generated based on the thermal load prediction value and according to the working mode of the laser, the method further includes: The pump current is monitored in real time whether it is reduced to zero, and the duration of the pump current being zero is recorded, and the duration is compared with a predetermined time threshold to generate a condition satisfaction signal; Based on the condition satisfaction signal, a first expansion valve complete closing signal is generated, the first expansion valve assembly is driven to a closed state through a controller digital output port, and a second expansion valve full opening signal is generated, the second expansion valve assembly is driven to a maximum opening degree state through a pulse output; The valve opening degree feedback data is collected in real time, and whether the states of the first expansion valve assembly and the second expansion valve assembly meet the expected setting are verified according to the valve opening degree feedback data.

[0010] In an implementation form of the application, the current fine tuning coefficient is calculated according to the difference between the target temperature value in the thermal load prediction value and the actual temperature value, specifically including: An independent temperature control loop is set for each pump source assembly in the laser system, and the same target temperature value is set for each temperature control loop; For each pump source component, the actual temperature value of the pump source component is acquired in real time, and an individual temperature deviation between the actual temperature value and the target temperature value is calculated; The individual temperature deviation of each pump source component is processed by a proportional-integral-derivative control algorithm, and an individual current fine tuning coefficient of the corresponding pump source component is output.

[0011] In an implementation form of the present application, overall current compensation is performed according to the difference between the power setting value in the thermal load prediction value and the actual power value, and an independent current adjustment value and a total current adjustment value of each pump source component are output, specifically including: The power setting value in the thermal load prediction value is determined, and a power difference between the power setting value and the actual power value is calculated; The power difference is processed by a proportional-integral-derivative control algorithm to generate an overall current compensation coefficient of the laser system; Based on the overall current compensation coefficient, a total current adjustment value corresponding to the laser system is calculated, and based on the preset theoretical working current value of each pump source component and the corresponding individual current fine tuning coefficient, an actual working current instruction of each pump source component after fine tuning compensation is obtained.

[0012] In an implementation form of the present application, after the refrigeration control signal is generated based on the thermal load prediction value and according to the working mode of the laser, the method further includes: When the laser system has no output, a state of zero pump source current is monitored, a pre-cold storage trigger signal is generated, and a compressor low-speed signal is generated based on the pre-cold storage trigger signal to control the compressor to maintain in a minimum speed state; A first expansion valve closing signal is generated to make the first expansion valve component in a completely closed state, and a second expansion valve fully opening signal is generated to make the second expansion valve component in a maximum opening state; A water tank temperature value is acquired in real time, when the water tank temperature value is lower than a preset water tank temperature threshold, a compressor closing signal is generated to set the compressor speed to zero, and cold energy buffer data is stored.

[0013] On the other hand, the embodiments of the present application also provide a temperature control device of a laser, which comprises: at least one processor; and a memory in communication connection with the at least one processor; The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the temperature control method of the laser as described above.

[0014] In another aspect, the embodiment of the present application also provides a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are executed to implement the temperature control method of the laser as described above.

[0015] The embodiment of the present application provides a temperature control method, device and medium of a laser, and at least has the following beneficial effects: By acquiring the pump current and generating the heat load prediction value by using the predefined current heat mapping table, the hysteresis of the traditional temperature control system depending on the temperature sensor feedback is overcome, the refrigeration demand can be predicted in advance before the heat is actually generated and causes temperature rise, the response speed of the temperature control system is improved, and the feedforward prediction of the heat generation of the laser is realized; the refrigeration control signal is generated based on the heat load prediction value and the working mode, the single temperature control target is decomposed into the composite control strategy matched with different working modes, so that the refrigeration system can actively adapt to the dynamic working state of the laser, and the cooperation and fine control of the compressor, the expansion valve, the fan and other execution components are realized; by combining independent adjustment and overall compensation, it is ensured that each pump source works in the best temperature interval, the long-term stability of the laser output power can be ensured, and the dynamic balance and accurate calibration at the system level are realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings described herein are used to provide further understanding of the present application, form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings: Figure 1 A flowchart of a temperature control method of a laser provided by the embodiment of the present application is shown in the figure; Figure 2 A schematic diagram of a laser core component provided by the embodiment of the present application is shown in the figure; Figure 3 A schematic diagram of a laser system provided by the embodiment of the present application is shown in the figure; Figure 4 A schematic diagram of a refrigeration system provided by the embodiment of the present application is shown in the figure; Figure 5 An internal structure schematic diagram of a temperature control device of a laser provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic flowchart illustrating a method for controlling the temperature of a laser, as provided in an embodiment of this application.

[0020] The analysis method involved in the embodiments of this application can be implemented by a terminal device or a server, and this application does not impose any special limitations on it. For ease of understanding and description, the following embodiments are all described in detail using a server as an example.

[0021] It should be noted that the server can be a single device or a system composed of multiple devices, i.e., a distributed server. This application does not make any specific limitations on this.

[0022] like Figure 1 As shown in the embodiment of this application, a method for controlling the temperature of a laser includes: Step 101: Obtain the operating parameters of the pump source component in the laser system, and based on the pump source current in the operating parameters, perform data query and interpolation calculation through a predefined current-heat mapping table to generate a predicted heat load value.

[0023] It should be noted that the operating parameters in the embodiments of this application include pump source current, actual temperature value and actual power value.

[0024] First, it is necessary to acquire the operating parameters of the core heat-generating component of the laser system, namely the pump source assembly, in real time. The pump source current is directly measured by a high-precision Hall current sensor installed in the pump source drive circuit. This current value directly represents the instantaneous electrical power injected into the pump source assembly and is the most critical feedforward signal for predicting its heat generation. The actual temperature value is collected by multiple thermistor sensors mounted on the heat sinks of each pump source, reflecting the real-time temperature status of each pump source assembly. The actual power value is obtained by monitoring a photodetector located in the laser output optical path and converting it through a calibration circuit, reflecting the final output performance of the laser system.

[0025] like Figure 2 As shown, the laser includes a laser system and a cooling system, with the cooling system responsible for providing necessary heat dissipation to the laser system. One cooling system uses a refrigerant circulation loop, while the other uses a water circulation loop. The laser system and the cooling system transmit data via a dedicated communication line.

[0026] like Figure 3 As shown, the laser system mainly includes a pump source assembly, an optical fiber assembly, and various sensor assemblies. The refrigerant circulation is used to dissipate heat from the pump source assembly, the water circulation is used to dissipate heat from the optical fiber assembly, and the power detection sensor can monitor the converted power value of the light in real time.

[0027] As shown in Figure 4 The refrigeration system mainly comprises a compressor assembly, a fan assembly, a water tank assembly, a water tank heating assembly, an expansion valve assembly, etc. The system can simultaneously output two heat loops of refrigerant and water circulation, and can provide two heat dissipation loops for the laser system.

[0028] In the embodiment, the current-heat mapping table is constructed in advance by a combination of a large number of experiments and theoretical calculations. During the development or calibration of the laser, the pump source is operated at a plurality of different and stable current values, and a precise heat measuring device, such as a flow meter combined with a high-precision temperature sensor, is used to directly or indirectly measure the steady-state heat power generated by the pump source assembly at the current. A one-to-one correspondence is established between the discrete current values and the corresponding measured heat power values. It should be noted that the actual power value, i.e., the actual power value, refers to the heat power, which is different from the laser output optical power. Exemplarily, these pairs of current-heat values are stored in the form of a two-dimensional array data structure in the non-volatile memory of the laser or the refrigeration system controller. The mapping table constitutes a knowledge base for converting electrical quantities to thermal quantities. During actual operation, the system continuously reads the real-time pump source current in the operating parameters through a high-sampling-rate current sensing circuit. After filtering and analog-to-digital conversion, the current signal becomes a digital quantity that can be processed by the control algorithm, serving as the input key value for querying the mapping table.

[0029] It can be understood that since the mapping table stores discrete data points, and the real-time pump source current is continuously changing, the probability of directly and accurately matching to a certain current value in the table is low. After obtaining the real-time pump source current value, the system compares it with all the current reference points stored in the mapping table array, thereby finding two similar current reference points. Among them, one reference point has a current value less than or equal to the current real-time current value, and the other reference point has a current value greater than or equal to the current real-time current value, and the two similar current reference points are the most adjacent to the current value in the current-heat mapping table. For example, if the current is a certain value, and there are current values A and B in the mapping table, and A < current < B, and there is no other stored value between A and B, then A and B are the adjacent current reference points found by the system, which will simultaneously extract the actual power values corresponding to the two adjacent current reference points.

[0030] After the adjacent points are determined, the system needs to calculate the interpolation scaling factor. It is noted that the interpolation scaling factor is used to represent the relative position of the current real-time current value within the interval determined by the two adjacent current reference points. Specifically, the calculation of the interpolation scaling factor is usually based on the assumption of linear relationship, and the calculation formula is: scaling factor = (current - smaller adjacent current) / (larger adjacent current - smaller adjacent current). The interpolation scaling factor is a dimensionless number between 0 and 1, a value of 0 indicates that the current is equal to the smaller adjacent reference point current, a value of 1 indicates that it is equal to the larger adjacent reference point current, and a value of 0.5 indicates that it is exactly in the middle of the two points.

[0031] After obtaining the interpolation scaling factor, the system linearly weights and sums the two adjacent actual power values extracted before. Specifically, the scaling factor is multiplied by the difference between the two adjacent actual power values, and the product is added to the smaller adjacent actual power value. The calculation formula is: interpolated heat load value = smaller actual power value + scaling factor * (larger actual power value - smaller actual power value). Exemplarily, it is mathematically equivalent to finding the corresponding heat power ordinate on a specific current abscissa on a line segment determined by the adjacent reference points on a two-dimensional coordinate plane, to realize the continuous value estimation between discrete data points.

[0032] It can be understood that there will also be a systematic reference heat load value representing the background heat load or system offset that may exist even when the pump current is zero. Therefore, the final heat load prediction value is obtained by adding the calculated interpolated heat load value to the reference heat load value. The final generated heat load prediction value is a power unit value with physical meaning, which is output to the downstream control logic module as a feedforward signal for setting the expected refrigeration capacity of the refrigeration system in advance, thereby realizing fast, smooth and accurate prediction of the dynamic heat generation of the laser.

[0033] In this embodiment, a pump current and heat generation table is pre-set in the control system, which is fixed in the flash of the controller in the form of a two-dimensional array. The following is a current-heat mapping table.

[0034] Table 1 Current-heat mapping table

[0035] The pump current is sent to the refrigeration system through the communication system, so that the refrigeration system converts the pump current of the pump component in the laser system into a corresponding heat load value according to the current-heat mapping table, so that the refrigeration capacity can be synchronized in advance to the corresponding refrigeration capacity. In the current-heat mapping table, the current between two adjacent current reference points is proportional to the heat, for example, when the current is 13.5A, the heat generated by the laser system is (6kW-5kW) / 2+5kW=5.5kW. The conventional temperature control system needs to detect the temperature rise of the heat source before starting to dissipate heat, but this speed control scheme can generate corresponding reverse heat dissipation when heat is generated, improve the response speed of the temperature control system, and make the temperature control more accurate.

[0036] Step 102, based on the heat load prediction value, and according to the working mode of the laser, a refrigeration control signal is generated and sent to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed.

[0037] It should be noted that the working mode in the embodiment of the application includes an urgent temperature drop mode, an urgent temperature rise mode and a normal mode.

[0038] In this embodiment, when the working mode of the laser is determined to be the urgent temperature drop mode, it indicates that the laser output power is instantaneously increased greatly, and the heat generation rate is sharply increased, for example, the processing instruction triggers a high-power pulse or a continuous wave power step-up. Specifically, the system sets the core parameters of the control target based on the generated heat load prediction value. The urgent temperature drop control signal is a composite instruction set, mainly including a first compressor speed control instruction, a first expansion valve control instruction and a first fan control instruction.

[0039] Firstly, the first compressor speed control instruction is sent to the compressor driver of the refrigeration system. It should be noted that the first high speed is not a fixed value, but is dynamically determined according to the heat load prediction value by table lookup. For example, there is a mapping relationship in the system, which maps the predicted heat load value to the corresponding compressor target speed value. The speed value is set at the high position of the compressor efficient working interval to ensure that the refrigeration capacity can be provided to match the predicted heat load or even slightly redundant. After the first compressor speed control instruction is issued, the compressor control system will drive the motor to quickly increase to the target speed.

[0040] Meanwhile, a first expansion valve control command is sent to a first expansion valve assembly, such as an electronic expansion valve, of a refrigerant circuit leading to the pump source assembly. The core of the first expansion valve control command is to command the opening of the first expansion valve assembly to its maximum allowable value, or to a high opening value specially set for the sudden temperature drop condition. It can be understood that the opening of the first expansion valve assembly directly determines the refrigerant flow rate into the pump source cold plate. Opening the first expansion valve assembly to the maximum is to eliminate the flow resistance and enable the low-temperature refrigerant to flow through the heat source at the maximum flow rate and the fastest speed, thereby maximizing the instantaneous heat exchange intensity and achieving impact cooling of the pump source core.

[0041] Synchronously, a first fan control command is sent to a condenser fan assembly of the refrigeration system. The first fan control command requires the fan assembly to be controlled at its maximum rated speed. Exemplarily, the condenser fan assembly is used to accelerate the heat dissipation of the condenser, and its speed reaching the maximum can significantly improve the heat dissipation efficiency of the refrigerant in the condenser, thereby ensuring that the entire refrigeration cycle can quickly dissipate heat at the high-pressure end, maintaining high refrigeration capacity output, and supporting high-load operation of the compressor.

[0042] It needs to be particularly pointed out that the above-mentioned aggressive cooling strategy is not executed in an open loop. The system continuously monitors the pump source current (for cross-verification of the actual load) and the temperature of key positions, such as the temperature of the refrigerant flowing into the pump source cold plate. Exemplarily, if the refrigerant temperature is monitored to be lower than a preset first threshold value, it indicates that the current cooling capacity may be too strong, and there is a risk of making the pump source temperature too low. It needs to be pointed out that the preset first threshold value is usually set to be slightly higher than the ambient dew point temperature to prevent the pump source surface from dewing. At this time, the system automatically adjusts the first expansion valve control command to moderately reduce the opening of the first expansion valve assembly. Feedback adjustment can gently transition the cooling intensity from the initial maximum to the optimization, while quickly suppressing the temperature rise, and avoiding dewing or thermal stress problems caused by overcooling.

[0043] In the present embodiment, the expansion valve assemblies are divided into two, of which the first expansion valve assembly is used to control the refrigeration capacity opening, and the second expansion valve assembly is used to control the refrigeration capacity opening of the water tank assembly. After the sudden temperature drop logic is started, the second expansion valve assembly is immediately closed, and the first expansion valve assembly is opened to the maximum opening to ensure that the pump source assembly is optimally cooled.

[0044] To protect the refrigeration system, in any case, the opening of the first expansion valve assembly + the opening of the second expansion valve assembly > 120°. In addition, when the optical module temperature > 26℃, the second expansion valve assembly is normally opened. When the laser has no output, the rotation speed of the compressor assembly is maintained at 20r / min, while the first expansion valve assembly is kept fully closed, and the second expansion valve assembly is kept in a fully open state for pre-cooling, and when the water tank temperature < 20℃, the rotation speed of the compressor assembly is set to 0. After starting the rapid temperature drop logic, the rotation speed of the fan assembly is opened to 100% maximum rotation speed.

[0045] In this embodiment, when the working mode of the laser is determined to be the rapid temperature rise mode, it usually corresponds to the sudden stop of laser output, such as the completion of processing or emergency shutdown, the pump current quickly drops to zero, and the heat source disappears. At this time, the purpose is no longer to dissipate heat quickly, but to prevent overcooling and energy management.

[0046] Specifically, the system first generates control instructions based on the heat load prediction value after the sudden drop (the value is very small or zero at this time). The rapid temperature rise control signal is also a composite instruction set, including the second compressor rotation speed control instruction, the second expansion valve control instruction and the second fan control instruction. The second compressor rotation speed control instruction is sent to the compressor driver, and the target is to reduce the rotation speed of the compressor to a second preset low rotation speed standby state. It can be understood that due to the inertia of the moving parts such as the compressor rotor, its rotation speed cannot be instantly reduced to zero, and a deceleration process is needed. The setting of the low rotation speed standby state is to let the compressor start to decelerate and reduce the refrigeration output, and at the same time, to maintain a minimum circulation to provide a basis for subsequent cold energy transfer operation of the system.

[0047] Next, the second expansion valve control instruction is sent to the first expansion valve and the second expansion valve. At this time, the system will not completely change the expansion valve state at the moment when the current is detected to be zero, but will continuously confirm whether the heat load (through the pump current or the direct heat load prediction value) is continuously lower than a preset low level heat load threshold within a predetermined delay time. This delay judgment is to avoid false triggering of the rapid temperature rise process due to temporary output fluctuations of the laser (such as the interval between intermittent pulses), and to ensure that the laser has indeed entered a stable shutdown state.

[0048] After confirming that the conditions are met, the system generates a first expansion valve fully closed signal to drive the first expansion valve assembly (usually an electronic expansion valve) to move to the fully closed position through the digital output port of the controller; at the same time, a second expansion valve fully open signal is generated to drive the second expansion valve assembly to move to the maximum opening state through pulse modulation output or the like.

[0049] The second expansion valve controls the flow of refrigerant to the water tank assembly (or a secondary heat dissipation loop). By doing so, the limited remaining cooling capacity generated by the refrigeration system (especially the compressor still running at low speed) will no longer flow to the pump cold plate that has no heat load, but will be directed entirely to the water tank assembly. The water in the water tank, due to its large specific heat capacity, can act as an efficient cold energy storage pool to store this part of the cold energy, which not only avoids the waste of valuable cold energy, but also fundamentally eliminates the risk of continuous cooling of the pump by the refrigerant, causing the temperature to drop too quickly below the dew point, solving the core problem of supercooling and condensation.

[0050] To ensure the accurate execution of the control action, the system also collects real-time feedback data from the valve body opening of the expansion valve assembly, such as position feedback from the in-valve potentiometer or stepper motor. The system compares this feedback data with the expected settings (i.e. full close and full open) to verify whether the actual state of the first expansion valve assembly and the second expansion valve assembly meets the control instruction requirements.

[0051] At the same time, the second fan control instruction is sent to the condenser fan, controlling the condenser fan assembly to zero or minimum maintenance speed. Exemplarily, in the rapid temperature rise mode, one of the system's goals is to reduce unnecessary heat loss, helping the laser system (especially the pump region) to maintain a certain temperature and slow down its cooling speed. Closing or reducing the fan assembly to a very low speed can significantly reduce the forced convection heat dissipation through the condenser, thereby reducing the heat dissipation efficiency of the entire refrigeration system, playing a heat preservation role, and cooperating with the strategy of closing the first expansion valve and opening the second expansion valve to stabilize the pump temperature and prevent temperature instability.

[0052] In this embodiment, when the laser system completes work or is in standby state, the system can enter the pre-cooling mode. The purpose of this mode is to store cold energy in advance during the system idle period, to prepare for the next possible high load operation, while achieving energy saving. Specifically, the system continuously monitors the pump current to be zero. When it is determined that the laser system is in a stable no-output state, a pre-cooling trigger signal is generated. Based on this signal, the system first generates a compressor low-speed signal to control the compressor to maintain a minimum speed state. The minimum speed is only used to overcome the system circulation resistance and maintain a very low speed flow of refrigerant, with very low power consumption, and the main purpose is to keep the refrigeration system online and ready to quickly increase at any time.

[0053] Then, the system generates a first expansion valve closing signal to make the first expansion valve assembly in a completely closed state, cutting off the refrigerant flow path to the pump cold plate; at the same time, a second expansion valve opening signal is generated to make the second expansion valve assembly in a maximum opening state. At this time, the small amount of cooling capacity generated by the minimum speed compressor will be introduced into the water tank assembly through the fully open second expansion valve, continuously and slowly cooling the water in the water tank, i.e. pre-cooling.

[0054] The system acquires the temperature value of the water tank in real time. When the water tank temperature value decreases to a preset water tank temperature threshold, it indicates that the cold storage has reached the expected target. It should be noted that the preset water tank temperature threshold is to ensure that the cold storage is sufficient and at a safe lower limit temperature. At this time, the system generates a compressor shutdown signal, and finally sets the compressor speed to zero, so that it completely stops running, thereby saving energy to the maximum. At the same time, the system records and stores the current cold storage data, such as water tank temperature, cold storage time, etc., which can be used to optimize the next start strategy or perform system state evaluation. Through this mode, the system completes the cold storage at the lowest energy consumption during the idle period, significantly improving the response speed and ability when facing the next sudden temperature drop.

[0055] In this embodiment, when the refrigeration system detects that the current is 0, it will immediately set the compressor assembly speed to a low-speed standby state, and since the compressor assembly needs to slow down slowly, it will detect whether the current is always 0 within 5s. If so, directly close the opening of the first expansion valve assembly, and set the opening of the second expansion valve assembly to the maximum, to ensure that the compressor assembly will provide refrigeration capacity to the water tank assembly for cold storage during the speed reduction process, thereby ensuring that the pump source will not lose temperature quickly. When the refrigeration system is in a sudden temperature rise condition, the fan assembly speed will be set to 0 to ensure that the entire system maintains a certain heat preservation effect and reduces temperature loss.

[0056] Step 103, calculate the current fine tuning coefficient according to the difference between the target temperature value in the heat load prediction value and the actual temperature value, and perform overall current compensation according to the difference between the power set value in the heat load prediction value and the actual power value, output the independent current adjustment value of each pump source assembly and the total current adjustment value.

[0057] In this embodiment, in order to realize accurate independent control of the temperature of each pump source assembly, an independent temperature control loop is first set for each pump source assembly in the laser system. It can be understood that each pump source assembly is equipped with a dedicated temperature sensor, such as a negative temperature coefficient thermistor installed close to its heat dissipation substrate, thereby forming an independent monitoring and control channel with the pump source as the control object. A same target temperature value is set for all independent temperature control loops, which is usually determined according to the optimal working temperature range of the laser, reliability requirements (such as preventing condensation), and material characteristics, and is the ideal temperature point that the system expects all pump sources to eventually reach and stabilize.

[0058] Specifically, the system acquires the actual temperature value of each pump source assembly in real time. The value is a digital quantity obtained by signal conditioning, analog-digital conversion and calibration of the temperature sensor signal of the corresponding circuit. Then, the system calculates the difference between the actual temperature value of each pump source assembly and the unified target temperature value, which is the individual temperature deviation. For example, if the actual temperature of a pump source is higher than the target temperature, the individual temperature deviation of the pump source is positive; otherwise, it is negative. This deviation directly reflects the deviation of the current temperature state of the pump source from the ideal state.

[0059] Next, the system processes the individual temperature deviation of each pump source assembly through a proportional-integral-derivative control algorithm. The system configures a separate digital PID controller for the temperature control loop of each pump source. The input of the PID algorithm is the individual temperature deviation calculated in real time. The PID controller internally includes three basic control actions: the proportional term responds to the current deviation value immediately and proportionally, the greater the deviation, the stronger the output adjustment; the integral term responds to the historical value of the deviation accumulated over time, which is used to eliminate persistent static errors and make the temperature eventually stabilize at the target value without static error; the derivative term responds to the rate of change of the deviation, which can predict the future trend of the deviation and apply suppression in advance, thereby improving the dynamic response of the system and reducing overshoot and oscillation. After the PID algorithm is synthesized, the output is the individual current fine-tuning coefficient for the specific pump source. This coefficient is usually a dimensionless multiplier factor, whose value fluctuates around 1. For example, when the temperature of a pump source is too high, the PID output may make the individual current fine-tuning coefficient slightly less than 1, or in some control logic, indirectly affect the heating or working state of the pump source by fine-tuning the current, so that the temperature returns to normal, thereby fine-tuning the theoretical current of the pump source downward in subsequent calculations; conversely, when the temperature is too low, the fine-tuning is upward. In this way, the system generates a personalized adjustment parameter for each pump source that is related to its own temperature state in real time.

[0060] In this embodiment, after the temperature-based individual fine-tuning is completed, the system also needs to perform overall calibration based on the output power. First, the power setting value contained in the heat load prediction value needs to be determined. It should be noted that the power setting value is usually associated with the user-set laser output power or the target power value generated by the system according to the processing requirements, representing the final optical power output target that the laser is expected to achieve. At the same time, the system acquires the actual power value of the laser in real time through a photodetector, calculates the difference between the power setting value and the actual power value, and obtains the power difference, which reflects the deviation between the current actual output efficiency of the laser and the expected target.

[0061] Then, the system processes the power difference through another independent proportional-integral-derivative (PID) control algorithm, with the real-time power difference as the input of the PID controller. The proportional term reacts to the instantaneous size of the power difference, the integral term is used to eliminate systematic and long-term power output errors, and the derivative term responds to the speed of the power change. The output of the PID controller is generated as the overall current compensation factor of the laser system, which is also a global multiplier factor. When the actual power value is lower than the set power, the overall current compensation factor is greater than 1, aiming to increase the laser output by increasing the total driving current of the system; when the actual power value is higher than the set power, the factor is less than 1, appropriately reducing the total current to prevent overshoot. The overall current compensation factor ensures that the laser output power can accurately track the set value for a long time, overcoming the power drift caused by factors such as pump source aging and optical device efficiency changes.

[0062] Finally, the system integrates individual fine-tuning and overall compensation to calculate the final instruction for each pump source component. First, based on the overall current compensation factor, the total current adjustment value corresponding to the laser system is calculated. Specifically, the preset theoretical current value calculated or looked up according to the target power value is multiplied by the overall current compensation factor to obtain the total current adjustment value, which represents the total current reference that the system should input under the current power calibration requirement.

[0063] For each pump source component, the preset theoretical working current value for the pump source component is obtained, which is usually divided by the system according to the total power demand and the number of pump sources. Then, the theoretical working current value is multiplied by the individual current fine-tuning factor of the corresponding pump source component, thereby incorporating the individual adjustment for its own temperature state. Next, the above result is multiplied by the calculated overall current compensation factor, thereby incorporating the global calibration based on the total output power of the system. Through this series of multiplication operations, the adjusted independent current adjustment value of each pump source component is finally obtained. It can be understood that the sum of the independent current adjustment values of all pump source components should be consistent or very close to the total current adjustment value in theory. The system finally outputs the independent current adjustment value to the respective pump source driver for execution, while the total current adjustment value can be output for system monitoring. In this way, not only is the temperature of multiple pump sources accurately balanced, but also the long-term high stability of the laser output power is guaranteed, greatly improving the overall performance and reliability of the laser.

[0064] The above is a method embodiment of the present application. Based on the same inventive concept, the present embodiment also provides a temperature control device for a laser, which has a structure as shown in Figure 5 .

[0065] Figure 5 An internal structure diagram of a temperature control device for a laser provided by the present embodiment is shown in Figure 5 . As shown in the figure, the device includes: at least one processor; and a memory connected with the at least one processor in communication; The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to: obtain operating parameters of the pump source assembly in the laser system, and based on the pump source current in the operating parameters, perform data query and interpolation calculation through a predefined current-heat mapping table to generate a heat load prediction value; the operating parameters include the pump source current, an actual temperature value and an actual power value; based on the heat load prediction value, and according to a working mode of the laser, generate a refrigeration control signal, and send the refrigeration control signal to an execution component of the refrigeration system to control at least one of a compressor speed, an expansion valve opening degree and a fan speed; the working mode includes an emergency cooling mode, an emergency heating mode and a normal mode; calculate a current fine tuning coefficient according to a difference between a target temperature value in the heat load prediction value and the actual temperature value, and perform overall current compensation according to a difference between a power set value in the heat load prediction value and the actual power value, and output an independent current adjustment value and a total current adjustment value of each pump source assembly.

[0066] The embodiments of the present application also provide a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions can enable the following when executed: obtain operating parameters of the pump source assembly in the laser system, and based on the pump source current in the operating parameters, perform data query and interpolation calculation through a predefined current-heat mapping table to generate a heat load prediction value; the operating parameters include the pump source current, an actual temperature value and an actual power value; based on the heat load prediction value, and according to a working mode of the laser, generate a refrigeration control signal, and send the refrigeration control signal to an execution component of the refrigeration system to control at least one of a compressor speed, an expansion valve opening degree and a fan speed; the working mode includes an emergency cooling mode, an emergency heating mode and a normal mode; calculate a current fine tuning coefficient according to a difference between a target temperature value in the heat load prediction value and the actual temperature value, and perform overall current compensation according to a difference between a power set value in the heat load prediction value and the actual power value, and output an independent current adjustment value and a total current adjustment value of each pump source assembly.

[0067] Each of the embodiments in the present application is described in a progressive manner, and the same and similar parts of each of the embodiments can be referred to each other, and each of the embodiments mainly describes the difference from other embodiments. Especially, for the device and medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the related parts can be referred to the part of the description of the method embodiments.

[0068] The device and medium provided by the embodiments of the present application are one-to-one corresponding, and therefore the device and medium also have similar beneficial technical effects to the corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device and medium will not be described here again.

[0069] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. In addition, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0070] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device implemented in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flow(s) or block(s).

[0071] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus, which implements the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flow(s) or block(s).

[0072] These computer program instructions can also be loaded into a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide a process for implementing the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flow(s) or block(s).

[0073] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memories.

[0074] Memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, etc. in the form of a computer-readable medium, read only memory (ROM), or flash memory, etc. Memory is an example of computer readable media.

[0075] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0076] It should also be noted that the terms "comprising", "containing", or any other variant thereof, are intended to encompass a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements in the list, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0077] The above only is an embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A temperature control method of a laser, characterized by, The method comprises: acquiring operating parameters of the pump assembly in the laser system, and based on the pump current in the operating parameters, performing data query and interpolation calculation through a predefined current-heat mapping table to generate a heat load prediction value; the operating parameters include pump current, actual temperature value and actual power value; based on the heat load prediction value, and according to the working mode of the laser, a refrigeration control signal is generated and sent to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed; the working mode includes the rapid cooling mode, the rapid heating mode and the normal mode; According to the difference between the target temperature value in the heat load prediction value and the actual temperature value, the current fine tuning coefficient is calculated, and the overall current compensation is carried out according to the difference between the power set value in the heat load prediction value and the actual power value, and the independent current adjustment value and the total current adjustment value of each pump assembly are output.

2. The temperature control method of a laser according to claim 1, wherein Based on the pump current in the operating parameters, the heat load prediction value is generated by performing data query and interpolation calculation through a predefined current-heat mapping table, specifically comprising: establishing a current-heat mapping table and reading the pump current in the operating parameters; the current-heat mapping table stores the correlation between a plurality of current values and corresponding actual power values in the form of a two-dimensional array; Based on the pump current, the current-heat mapping table is accessed to extract the adjacent current reference points and the actual power values corresponding to the adjacent current reference points in the current-heat mapping table, and based on the position of the pump current between the adjacent current reference points, the interpolation proportion coefficient is calculated; The interpolation proportion coefficient is applied to weighted summation of adjacent actual power values to generate an interpolation heat load value, and the interpolation heat load value is superimposed with a reference heat load value to generate a heat load prediction value corresponding to the pump current.

3. The method of claim 1, wherein the temperature of the laser is controlled by the controller based on the temperature of the laser and the temperature of the cooling system. Based on the heat load prediction value, and according to the working mode of the laser, a refrigeration control signal is generated and sent to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed, specifically comprising: In the case that the working mode of the laser is the rapid cooling mode, a rapid cooling control signal is generated based on the heat load prediction value; the rapid cooling control signal includes a first compressor speed control instruction, a first expansion valve control instruction and a first fan control instruction; The first compressor speed control instruction is sent to the compressor assembly of the refrigeration system to increase the compressor assembly speed to a preset first high speed based on the heat load prediction value; The first expansion valve control instruction is sent to the first expansion valve assembly of the refrigeration system to increase the opening degree of the first expansion valve assembly to the maximum value; The first fan control instruction is sent to the fan assembly of the refrigeration system to control the fan assembly speed to the maximum speed; In the execution of the rapid cooling control signal, the pump current and the key point temperature are continuously monitored, and when the temperature of the refrigerant flowing to the pump source assembly is lower than the first threshold value, the first expansion valve control instruction is adjusted to reduce the opening degree of the first expansion valve.

4. The method of claim 1, wherein the temperature of the laser is controlled by the controller based on the temperature of the laser and the temperature of the cooling system. Based on the heat load prediction value, and according to the working mode of the laser, a refrigeration control signal is generated, and the refrigeration control signal is sent to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed, specifically including: In the case of the working mode of the laser being the rapid heating mode, a rapid heating control signal is generated based on the heat load prediction value; the rapid heating control signal includes a second compressor speed control instruction, a second expansion valve control instruction and a second fan control instruction; The second compressor speed control instruction is sent to the compressor assembly of the refrigeration system to reduce the compressor assembly speed to a second preset low speed standby state based on the heat load prediction value; The second expansion valve control instruction is sent to the first expansion valve assembly and the second expansion valve assembly of the refrigeration system, and after confirming that the heat load continues to be lower than the preset low level heat load threshold value for a predetermined delay time, the first expansion valve assembly opening degree is reduced to a closed state, and the second expansion valve assembly opening degree is increased to a maximum value, so as to guide the remaining cold quantity of the refrigeration system to the water tank assembly for storage; The second fan control instruction is sent to the fan assembly of the refrigeration system, and the fan assembly speed is controlled to zero speed or minimum speed to reduce the heat dissipation of the laser system.

5. The method of claim 1, wherein the temperature of the laser is controlled by the controller based on the temperature of the laser and the temperature of the cooling system. Based on the heat load prediction value, and according to the working mode of the laser, a refrigeration control signal is generated, and the refrigeration control signal is sent to the execution component of the refrigeration system to control at least one of the compressor speed, the expansion valve opening degree and the fan speed, specifically including: Real-time monitoring of whether the pump current is reduced to zero, and recording the duration of the pump current being zero, comparing the duration with a predetermined time threshold, and generating a condition satisfaction signal; Based on the condition satisfaction signal, a first expansion valve complete closing signal is generated, the first expansion valve assembly is driven to a closed state through a controller digital output port, and a second expansion valve full opening signal is generated, the second expansion valve assembly is driven to a maximum opening degree state through a pulse output; Real-time acquisition of valve opening degree feedback data, and verification of whether the states of the first expansion valve assembly and the second expansion valve assembly meet the expected setting according to the valve opening degree feedback data.

6. The method of claim 1, wherein the temperature of the laser is controlled by the controller based on the temperature of the laser and the temperature of the cooling system. According to the difference between the target temperature value in the heat load prediction value and the actual temperature value, a current fine tuning coefficient is calculated, specifically including: Setting an independent temperature control loop for each pump source assembly in the laser system, and setting the same target temperature value for each temperature control loop; For each pump source assembly, the actual temperature value of the pump source assembly is obtained in real time, and the individual temperature deviation between the actual temperature value and the target temperature value is calculated; The individual temperature deviation of each pump source assembly is processed through a proportional-integral-derivative control algorithm, and the individual current fine tuning coefficient of the corresponding pump source assembly is output.

7. The method of claim 6, wherein the temperature of the laser is controlled by adjusting the temperature of the cooling fluid. The overall current compensation is performed according to the difference between the power set value in the thermal load prediction value and the actual power value, and an independent current adjustment value and a total current adjustment value of each pump source component are output, specifically including: A power set value in the thermal load prediction value is determined, and a power difference between the power set value and the actual power value is calculated; The power difference is processed by a proportional-integral-derivative control algorithm to generate an overall current compensation coefficient of the laser system; Based on the overall current compensation coefficient, a total current adjustment value corresponding to the laser system is calculated, and based on a preset theoretical working current value of each pump source component and a corresponding individual current fine-tuning coefficient, an actual working current instruction of each pump source component after fine-tuning compensation is obtained.

8. The method of claim 1, wherein the temperature of the laser is controlled by the controller based on the temperature of the laser and the temperature of the cooling system. Based on the thermal load prediction value and according to the working mode of the laser, a refrigeration control signal is generated, and the method further includes: When the laser system has no output, a state in which the pump source current is zero is monitored, a pre-cold storage trigger signal is generated, and based on the pre-cold storage trigger signal, a compressor low-speed signal is generated to control the compressor to maintain a minimum speed state; A first expansion valve closing signal is generated to make the first expansion valve component in a completely closed state, and a second expansion valve fully open signal is generated to make the second expansion valve component in a maximum opening state; A water tank temperature value is obtained in real time, when the water tank temperature value is lower than a preset water tank temperature threshold, a compressor closing signal is generated to set the compressor speed to zero, and cold quantity buffer data is stored.

9. A temperature control apparatus for a laser, characterized by comprising: The device includes: at least one processor; and a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform a temperature control method of a laser as claimed in any one of claims 1-8.

10. A non-transitory computer storage medium storing computer-executable instructions, the computer-executable instructions comprising instructions for: receiving a request to access a file; determining whether the file is stored in a cache; and in response to determining that the file is stored in the cache, providing access to the file from the cache. The computer executable instructions, when executed, implement a temperature control method of a laser as claimed in any one of claims 1-8. The computer executable instructions, when executed, implement a temperature control method of a laser as claimed in any one of claims 1-8.

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