Laser heating circuit and heating method

Abstract

The present disclosure provides a laser heating circuit and a heating method, wherein the laser heating circuit comprises: a control unit configured to generate a heating control signal in response to an input heating signal; and configured to adjust the heating control signal; a heating unit configured to output a heating beam corresponding to the heating control signal in response to the heating control signal; a detection unit configured to obtain the temperature of the surface of the material to be processed and generate a corresponding detection signal, wherein the detection signal is used to characterize the voltage value corresponding to the current temperature of the surface of the material to be processed; a signal processing unit configured to generate a corresponding electrical signal based on a first temperature detection signal; and a communication control unit configured to determine the current temperature of the surface of the material to be processed according to the electrical signal, and output the corresponding detection signal to the control unit. The above technical solution can reduce the complexity and implementation cost of the laser heating circuit while improving the processing quality of the material to be processed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of laser heating, and in particular to a laser heating circuit and a heating method. Background Art

[0002] Laser heating is the process of heating the material to be processed by laser energy. The working process is as follows: the laser beam is emitted from the laser, transmitted and focused, and irradiated to the surface of the material. Part of it is reflected, and part of it enters the interior of the material and is absorbed by the material, so that the temperature of the surface layer of the material rises rapidly.

[0003] During actual heating, the surface temperature of the material to be processed needs to reach a set temperature to improve the processing quality of the material to be processed. In this process, multiple temperature measurement systems are usually required to monitor the surface temperature of the material to be processed in real time.

[0004] However, in actual heating, existing laser heating solutions still have problems. Summary of the invention

[0005] In view of this, the present disclosure provides a laser heating circuit and a heating method, which can improve the processing quality of the material to be processed while reducing the complexity and implementation cost of the laser heating circuit.

[0006] The present disclosure provides a laser heating circuit, comprising: a control unit, configured to generate a heating control signal in response to an input heating signal; and configured to adjust the heating control signal according to a current temperature of a surface of a material to be processed and a target temperature contained in a first detection signal;

[0007] A heating unit is coupled to the control unit and is configured to output a heating light beam corresponding to the heating control signal to the material to be processed in response to the heating control signal; the heating unit includes a plurality of drivers and a plurality of heaters, and the drivers and the heaters are coupled one by one;

[0008] A detection unit is configured to obtain the temperature of the surface of the material to be processed and generate a corresponding second detection signal, wherein the second detection signal is used to represent a voltage value corresponding to the current temperature of the surface of the material to be processed;

[0009] a signal processing unit, coupled to the detection unit, and configured to generate a corresponding electrical signal based on the second detection signal;

[0010] The communication control unit is coupled to the signal processing unit and the control unit respectively, and is configured to determine the current temperature of the surface of the material to be processed according to the electrical signal, and output a corresponding first detection signal to the control unit.

[0011] In the above embodiment, the heating unit includes a plurality of drivers and a plurality of heaters, and the drivers and the heaters are coupled one by one. By configuring a signal processing unit coupled to the detection unit, the second detection signal representing the temperature of the surface of the material to be processed can be converted into a corresponding electrical signal, so that the communication control unit can determine the current temperature of the surface of the material to be processed according to the electrical signal, and output the corresponding first detection signal to the control unit to adjust the heating control signal. In other words, by setting the detection unit, and the adapted signal processing unit and communication control unit, the intensity of the heating beams output by the plurality of heaters can be adjusted, and the complexity and implementation cost of the laser heating circuit can be reduced while improving the processing quality of the material to be processed.

[0012] Optionally, the driver is configured to output a driving signal to a corresponding heater according to the heating control signal;

[0013] The heater is configured to output the heating light beam to one of the areas on the surface of the material to be processed according to the driving signal.

[0014] In the above embodiment, by configuring a driver and a heater with a corresponding relationship, the power of the heating beam output by the heater can be flexibly configured and changed, so that the temperature of the surface of the heated material to be processed can be changed in real time, and the temperature of the surface of the material to be processed can be made the target temperature, so as to further improve the processing quality.

[0015] Optionally, the detection unit is configured to obtain the temperature of all areas on the surface of the material to be processed, and generate a corresponding second detection signal based on the average value of the temperatures of each area; or, the detection unit is configured to obtain the temperature of one area on the surface of the material to be processed, and generate a corresponding second detection signal based on the temperature of the area.

[0016] In the above embodiment, by acquiring the temperatures of all areas on the surface of the material to be processed and generating a corresponding second detection signal based on the average temperature of each area, the degree of heating of the material to be processed by the heating devices at different positions is taken into consideration, and the current temperature of the surface of the material to be processed can be more realistically reflected, thereby improving the accuracy of the second detection signal; by only acquiring the temperature of one area on the surface of the material to be processed, the detection unit can generate a second detection signal based on this temperature, which is easy to implement.

[0017] Optionally, the signal processing unit includes: a signal processing module, coupled to the detection unit, configured to convert a voltage value corresponding to the second detection signal into a current value;

[0018] The conversion module is coupled to the signal processing module and the communication control unit respectively, and is configured to convert the current value into a voltage value and use the voltage value as the electrical signal.

[0019] In the above embodiment, by converting the second detection signal into an electrical signal, since the electrical signal has good anti-interference performance during transmission, the stability of the electrical signal during transmission can be improved, thereby improving the accuracy of the current temperature value obtained subsequently.

[0020] Optionally, the signal processing module includes: an operational amplifier, a bias resistor, a switch device, a first feedback resistor and a second feedback resistor, and an output resistor, wherein:

[0021] The first end of the operational amplifier is used to receive the voltage value, the second end of the operational amplifier is connected to the first end of the first feedback resistor, and the output end of the operational amplifier is connected to the bias resistor;

[0022] The second end of the bias resistor is connected to the control end of the switch device;

[0023] The first end of the switch device is suitable for inputting the power supply voltage through the output resistor and serving as the output end of the signal processing module, and the second end of the switch device is respectively connected to the second end of the first feedback resistor and the first end of the second feedback resistor;

[0024] A second terminal of the second feedback resistor is grounded.

[0025] Optionally, the conversion module includes a conversion resistor, a first end of the conversion resistor is coupled to the output end of the signal processing module, and a second end of the conversion resistor is coupled to the communication control unit.

[0026] In the above embodiment, the conversion resistor has good stability. By using the conversion resistor as a conversion module, the stability and accuracy of the voltage value can be improved, thereby improving the stability and accuracy of the electrical signal, so that the temperature closed-loop control of the laser heating circuit has higher accuracy.

[0027] Optionally, the communication control unit is configured to determine the temperature corresponding to the electrical signal according to a preset mapping relationship between the electrical signal and the temperature, and use the temperature as the current temperature of the surface of the material to be processed.

[0028] In the above embodiment, when the communication control unit obtains the electrical signal from the signal processing unit, the temperature corresponding to the electrical signal can be automatically obtained according to the mapping relationship between the electrical signal and the temperature stored internally. The whole process does not require manual processing, which can improve the computing efficiency and the accuracy of the calculated temperature, that is, improve the accuracy of the current temperature of the surface of the material to be processed.

[0029] Optionally, the communication control unit includes a microprocessor, and serial communication is adopted between the microprocessor and the control unit.

[0030] Optionally, the laser heating circuit further comprises: a temperature detection device, disposed on the heating unit, configured to obtain the temperature of the heating unit and generate a temperature detection signal;

[0031] The control unit is coupled to the temperature detection device and is further configured to determine a current temperature value of the heating unit according to the temperature detection signal, and compare the current temperature value of the heating unit with a preset temperature value to generate a temperature control adjustment signal;

[0032] The temperature regulating unit is coupled to the control unit and is suitable for switching on or off the flow path of the cooling medium to the heating unit according to the temperature control regulation signal, and regulating the flow rate of the cooling medium according to the temperature of the cooling medium and the current temperature value of the heating unit.

[0033] Accordingly, an embodiment of the present disclosure further provides a laser heating method, which is applied to the laser heating circuit described in any of the above examples, and the laser heating method includes:

[0034] generating a heating control signal in response to an input heating signal;

[0035] In response to the heating control signal, outputting a heating light beam corresponding to the heating control signal to the material to be processed;

[0036] Acquiring the temperature of the surface of the material to be processed and generating a corresponding second detection signal, wherein the second detection signal is used to represent a voltage value corresponding to the current temperature of the surface of the material to be processed;

[0037] Based on the second detection signal, generating a corresponding electrical signal;

[0038] Determine the current temperature of the surface of the material to be processed according to the electrical signal, and generate a corresponding first detection signal;

[0039] The heating control signal is adjusted according to the current temperature of the surface of the material to be processed and the target temperature contained in the first detection signal.

[0040] In the above embodiment, by setting up a detection unit, and an adaptive signal processing unit and communication control unit, the intensity of the heating beams output by multiple heaters can be adjusted, thereby improving the processing quality of the material to be processed and reducing the complexity and implementation cost of the laser heating circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 It is a structural schematic diagram of a laser heating circuit;

[0043] Figure 2 It is a structural schematic diagram of a laser heating circuit in an embodiment of the present disclosure;

[0044] Figure 3 It is a structural schematic diagram of a heating unit in an embodiment of the present disclosure;

[0045] Figure 4 is a structural schematic diagram of a signal processing unit in an embodiment of the present disclosure;

[0046] Figure 5 is a structural schematic diagram of a signal processing module in an embodiment of the present disclosure;

[0047] Figure 6 The figure is a flow chart of a laser heating method in the present disclosure. DETAILED DESCRIPTION

[0048] As described in the background art, in actual heating, existing laser heating solutions still have problems. For ease of understanding, an example is used to illustrate.

[0049] See also Figure 1 A schematic diagram of the structure of a laser heating circuit is shown in FIG. Figure 1 As shown, the laser heating circuit includes multiple heating branches, wherein any heating branch includes a controller, a driver, a laser and an infrared temperature sensor. For example, the first heating branch includes a controller C1, a driver D1, a laser L1 and an infrared temperature sensor T1, and its working principle is:

[0050] The controller C1 outputs a heating control signal to the driver D1. According to the heating control signal, the driver D1 drives the laser L1 to emit a heating beam to one of the areas of the material to be processed, so that the temperature of the material A to be processed increases. The infrared temperature sensor T1 can detect the temperature of the material A to be processed and output it to the controller C1, so that the controller C1 can adjust the heating control signal to keep the temperature of the material A to be processed constant.

[0051] When there are n (where n is an integer greater than 1) heating branches, the entire surface of the material to be processed can be heated according to the heating method of the first heating branch.

[0052] In actual application, the inventors found that the heating area of ​​any one of the lasers L1 to Ln is limited. For materials to be processed with a larger area, the number of lasers is large, and therefore more infrared temperature sensors need to be configured.

[0053] Furthermore, if more lasers are to be added, more infrared temperature sensors will also need to be added, which makes the implementation cost of the laser heating circuit high.

[0054] In addition, the multiple infrared temperature sensors require complex fixtures, which will make the entire system bloated and have higher requirements for space layout and production line installation.

[0055] In order to solve the above technical problems, the present disclosure provides a laser heating circuit, wherein the heating unit includes a plurality of drivers and a plurality of heaters, and the drivers and the heaters are coupled one by one, and by configuring a signal processing unit coupled to the detection unit, a second detection signal representing the temperature of the surface of the material to be processed can be converted into a corresponding electrical signal, so that the communication control unit can determine the current temperature of the surface of the material to be processed according to the electrical signal, and output the corresponding first detection signal to the control unit to adjust the heating control signal. In other words, by setting the detection unit, and the matching signal processing unit and communication control unit, the intensity of the heating beams output by the plurality of heaters can be adjusted, thereby reducing the complexity and implementation cost of the laser heating circuit while improving the processing quality of the material to be processed.

[0056] In order to enable those skilled in the art to better understand and implement the present disclosure, the specific schemes, principles, advantages, effects, etc. of the present disclosure are described in detail through specific embodiments with reference to the accompanying drawings.

[0057] In this disclosure, see Figure 2 and Figure 3 ,in, Figure 2 is a schematic diagram of the structure of a laser heating circuit in an embodiment of the present disclosure, Figure 3 Schematic diagram of the structure of a heating unit in an embodiment of the present disclosure. Figure 2 and Figure 3 As shown, the laser heating circuit 100 may include:

[0058] The control unit 110 is configured to generate a heating control signal in response to an input heating signal; and is configured to adjust the heating control signal according to the current temperature and the target temperature of the surface of the material A to be processed included in the first detection signal;

[0059] A heating unit 120, coupled to the control unit 110, is configured to output a heating light beam corresponding to the heating control signal to the material A to be processed in response to the heating control signal;

[0060] The detection unit 130 is configured to obtain the temperature of the surface of the material to be processed and generate a corresponding second detection signal, wherein the second detection signal is used to represent the voltage corresponding to the current temperature of the surface of the material to be processed;

[0061] a signal processing unit 140, coupled to the detection unit 130, and configured to generate a corresponding electrical signal based on the second detection signal;

[0062] The communication control unit 150 is coupled to the signal processing unit 140 and the control unit 110 respectively, and is configured to determine the current temperature of the surface of the material A to be processed according to the electrical signal, and output a corresponding first detection signal to the control unit 110.

[0063] Combination Figure 3 The heating unit 120 may include a plurality of drivers D11 to D1m and a plurality of heaters L11 to L1m (wherein m is an integer greater than 1), and the drivers and the heaters are coupled one-to-one, for example, driver D11 is coupled to L11, driver D12 is coupled to L12, ..., driver D1m is coupled to L1m. By configuring drivers and heaters having a coupling relationship, a heating process of the material A to be processed can be achieved.

[0064] Combination Figure 2 and Figure 3 , briefly describing the working principle of the laser heating circuit 100 in the embodiment of the present disclosure:

[0065] When it is necessary to heat the material A to be processed, in response to the input heating signal (the heating signal can be manually input or obtained from other devices), the control unit 110 can generate a heating control signal corresponding to the heating signal, and output it to the drivers D11 to D1m in the heating unit 120 (that is, the drivers D11 to D1m obtain the same heating control signal to output a driving signal with the same intensity), so that the drivers D11 to D1m can output the driving signal to the corresponding heater, and then the heaters L11 to L1m can output a heating light beam to the material to be processed according to the set light power (as a non-limiting example, the specifications of the heaters L11 to L1m are the same), thereby changing the surface temperature of the material A to be processed.

[0066] At the same time, the detection unit 130 can obtain the temperature of the surface of the material A to be processed (for example, the temperature of the area heated by any one of the heaters L11 to L1m can be obtained, or the temperature of the area heated by all of the heaters L11 to L1m can be obtained), and output a second detection signal (it should be noted that the number of second detection signals can be one or more, and the specific number depends on the area detected by the detection unit 130) to the signal processing unit 140, so that the signal processing unit 140 can generate a corresponding electrical signal to the communication control unit 150 based on the voltage value corresponding to the current temperature of the surface of the material to be processed represented by the second detection signal, so that the communication control unit 150 can process the electrical signal to determine the current temperature of the surface of the material A to be processed, and output the corresponding first detection signal to the control unit 110.

[0067] The control unit 110 can adjust the intensity of the heating control signal according to the current temperature of the surface of the material A to be processed contained in the first detection signal and the target temperature (for example, if the current temperature is greater than the target temperature, the intensity of the heating control signal is weakened; for example, if the current temperature is less than the target temperature, the intensity of the heating control signal is increased) so that the temperature of the material A to be processed is the target temperature, thereby improving the processing quality of the material to be processed.

[0068] And by Figure 2 and Figure 3 It can be seen that the above scheme only requires one control unit 110, one detection unit 130, and a signal processing unit 140 and a communication control unit 150 adapted to the detection unit 130. Compared with the existing scheme, the number of detection units 130 used can be significantly reduced, so the number of fixtures is also reduced, and the complexity and implementation cost of the laser heating circuit are reduced.

[0069] In other words, by setting up a detection unit, as well as an adaptive signal processing unit and a communication control unit, the intensity of the heating beams output by multiple heaters can be adjusted, thereby improving the processing quality of the material to be processed while reducing the complexity and implementation cost of the laser heating circuit.

[0070] It should be noted that, first, the heating beam in the embodiment of the present disclosure may refer to any light source having energy, for example, the heating beam may be a laser; second, Figure 3 The number, connection relationship, etc. of the illustrated drivers D11 to D1m and heaters L11 to L1m are merely illustrative, and are used to indicate that a plurality of heating branches may be used to heat the material to be processed, and should not be construed as a limitation to the present invention.

[0071] In some embodiments of the present disclosure, for any driver and heater that are coupled to each other, the same heating method can be used to heat the materials to be processed that they cover.

[0072] As an optional example, the driver D11 is configured to output a driving signal to the corresponding heater L11 according to a heating control signal; the heater L11 is configured to output the heating beam to one of the areas on the surface of the material to be processed according to the driving signal.

[0073] In short, by configuring a driver and a heater with a corresponding relationship, the power of the heating beam output by the heater can be flexibly configured and changed, so that the temperature of the surface of the heated material to be processed can be changed in real time, and the temperature of the surface of the material to be processed can be made the target temperature, so as to further improve the processing quality.

[0074] It should be noted that the working principles of the drivers D12 to D1m and the heaters L12 to L1m can refer to the detailed description of the driver D11 and the heater L11.

[0075] In a non-limiting example, the power, specification, size and other parameters of the heaters are consistent, so that when the same heating control signal is obtained, each heater outputs a heating beam with the same power. Thus, the temperature change on the surface of the material to be processed is consistent, reducing the impact of excessive temperature difference between different areas on the surface of the material to be processed on the processing quality of the material to be processed.

[0076] In some other embodiments, the power, specifications, size and other parameters of the heater may be different, and the embodiments of the present disclosure do not impose any limitations on this.

[0077] In some embodiments of the present disclosure, the detection unit is used to detect the temperature of the surface of the material to be processed so that the control unit can perform adjustment operations. From the foregoing content, it can be seen that the heating unit has multiple drivers and multiple heaters, and each heater is used to heat a different area on the surface of the material to be processed, so that the detection unit can obtain the temperature of at least one area.

[0078] As an optional example, the detection unit may be configured to obtain the temperatures of all regions on the surface of the material to be processed, and generate a corresponding second detection signal based on an average value of the temperatures of the respective regions.

[0079] Specifically, the detection surface of the detection unit is adapted to the surface of the material to be processed. In one detection process, the detection unit can obtain the temperature of all areas on the surface of the material to be processed (or the temperature of all areas heated by the heaters). In this way, the detection unit can calculate the average temperature of all areas to obtain an average temperature value for characterizing the current temperature of the material to be processed. Based on the temperature average value, a second detection signal can be generated.

[0080] The above-mentioned temperature detection scheme takes into account the degree of heating of the material to be processed by the heating devices at different positions, and can more truly reflect the current temperature of the surface of the material to be processed, thereby improving the accuracy of the second detection signal.

[0081] In some embodiments of the present disclosure, the detection unit may obtain the temperature of the surface of the material to be processed in a non-contact manner.

[0082] In a specific embodiment, the detection unit may be an infrared temperature sensor, more specifically, a multi-point infrared temperature sensor.

[0083] As another optional example, the detection unit may be configured to obtain the temperature of one of the regions on the surface of the material to be processed, and generate a corresponding second detection signal based on the temperature of the region.

[0084] Specifically, in one detection process, the detection unit only obtains the temperature of one area on the surface of the material to be processed (or the temperature of an area heated by one of the heaters), so that the detection unit can generate a second detection signal based on this temperature.

[0085] By adopting the above-mentioned temperature detection scheme, only the degree of heating of the material to be processed by one of the heating devices is considered, and the detection scheme is easy to implement.

[0086] In a specific embodiment, the detection unit may be an infrared temperature sensor, more specifically, a single-point infrared temperature sensor.

[0087] In summary, the two temperature detection schemes can obtain a second detection signal, and based on the second detection signal, all drivers can output the same driving parameters, so as to further reduce the implementation cost of temperature closed-loop control.

[0088] Combination Figure 2 , see Figure 4 A structural diagram of a signal processing unit in an embodiment of the present disclosure is shown in FIG. Figure 4 As shown, the signal processing unit 140 may include:

[0089] A signal processing module 141, coupled to the detection unit 130, and configured to convert a voltage value corresponding to the second detection signal into a current value;

[0090] The conversion module 142 is coupled to the signal processing module 141 and the communication control unit 150 respectively, and is configured to convert the current value into a voltage value and use the voltage value as the electrical signal.

[0091] Specifically, when the second detection signal generated by the detection unit 130 is transmitted to the signal processing module 141, the signal processing module 141 can convert the temperature value corresponding to the second detection signal into a current value, and then the conversion module 142 can further convert the current value to obtain a voltage value corresponding to the current value to obtain an electrical signal, that is, the voltage value is used as an electrical signal.

[0092] By converting the second detection signal into an electrical signal, since the electrical signal has good anti-interference performance during the transmission process, the stability of the electrical signal during the transmission process can be improved, thereby improving the accuracy of the current temperature value obtained subsequently.

[0093] In some embodiments of the present disclosure, Figure 4 , see Figure 5 A structural diagram of a signal processing module is shown in FIG. Figure 5 As shown, the signal processing module 141 includes: an operational amplifier OPA, a bias resistor R1, a switch device Q1, a first feedback resistor R2 and a second feedback resistor R3, and an output resistor R4, wherein:

[0094] The first end of the operational amplifier OPA is used to receive the voltage value Vin, the second end of the operational amplifier OPA is connected to the first end of the first feedback resistor R2, and the output end of the operational amplifier OPA is connected to the bias resistor R1;

[0095] The second end of the bias resistor R1 is connected to the control end of the switch device Q1;

[0096] The first end of the switch device Q1 is suitable for inputting the power supply voltage VCC through the output resistor R4 and serving as the output end out of the signal processing module 141, and the second end of the switch device Q1 is respectively connected to the second end of the first feedback resistor R2 and the first end of the second feedback resistor R3;

[0097] A second terminal of the second feedback resistor R3 is grounded.

[0098] Specifically, the operational amplifier OPA acts as a comparator. By comparing the voltage value Vin at the first end with the feedback voltage value at the second end, it can output a drive signal for driving the switching device Q1 to turn on. Then, through the bias resistor R1, the voltage value Vin at the first end of the operational amplifier OPA can be converted into a current and output.

[0099] The input voltage value Vin is added to the input terminal of the operational amplifier OPA, and the output voltage is stabilized through the negative feedback of the operational amplifier OPA. The output voltage is used as the base voltage of the switching device Q1 to control the conduction degree of the switching device Q1, so that the collector or emitter current of the switching device Q1 is proportional to the input voltage signal, realizing the conversion of the analog voltage signal to the current signal.

[0100] For example, if the input voltage increases, the output voltage of the operational amplifier OPA also increases, causing the base current of the switching device Q1 to increase, thereby increasing the collector or emitter current of the switching device Q1, that is, the output current increases.

[0101] The feedback voltage value at the second end may refer to the sum of the voltage drops across the first feedback resistor R2 and the second feedback resistor R3 when the switch device Q1 is turned on.

[0102] Specifically, when the switch device Q1 is turned on, a current will be generated on the second feedback resistor R3, and the first feedback resistor R2 and the second feedback resistor R3 are connected in series, so the currents on the first feedback resistor R2 and the second feedback resistor R3 are the same, and the feedback voltage value at the two ends is the sum of the voltage drops on the first feedback resistor R2 and the second feedback resistor R3.

[0103] In some optional embodiments of the present disclosure, the operational amplifier OPA also has a third terminal, and the signal processing module 141 can also be provided with a protection resistor R6 between the power supply voltage VCC and the third terminal, so as to protect the operational amplifier OPA and make the operational amplifier OPA work more stably.

[0104] The operational amplifier OPA also has a fourth terminal for grounding.

[0105] The signal processing module 141 may also be connected to an input resistor R5 at the first end of the operational amplifier OPA. The input resistor R5 may play a protective role to avoid or reduce damage to the operational amplifier OPA caused by an excessively large voltage value Vin.

[0106] In some embodiments of the present disclosure, the conversion module 142 may include a conversion resistor, a first end of the conversion resistor is coupled to the output end of the signal processing module 141 , and a second end of the conversion resistor is coupled to the communication control unit 150 .

[0107] The conversion resistor has good stability. By using the conversion resistor as a conversion module, the stability and accuracy of the voltage value can be improved, thereby improving the stability and accuracy of the electrical signal, so that the temperature closed-loop control of the laser heating circuit has higher accuracy.

[0108] In some optional examples of the present disclosure, in order to filter out the noise signal in the second detection signal, the laser heating circuit may further include a filter device coupled between the signal processing unit (e.g., the signal processing module) and the detection unit, so that the second detection signal can be filtered so that only the second detection signal passes through, thereby reducing the impact of noise of other wavelengths on subsequent temperature values, and further improving the accuracy of temperature closed-loop control.

[0109] In some embodiments of the present disclosure, the mapping relationship between the electrical signal and the temperature may be pre-stored in the communication control unit, and then the communication control unit may determine the temperature corresponding to the electrical signal according to the corresponding relationship.

[0110] Specifically, the communication control unit may be configured to determine the temperature corresponding to the electrical signal according to a preset mapping relationship between the electrical signal and the temperature, and use the temperature as the current temperature of the surface of the material to be processed.

[0111] In other words, when the communication control unit obtains the electrical signal from the signal processing unit, it can automatically obtain the temperature corresponding to the electrical signal based on the mapping relationship between the electrical signal and the temperature stored internally. The entire process does not require manual processing, which can improve the computing efficiency and the accuracy of the calculated temperature, that is, improve the accuracy of the current temperature of the surface of the material to be processed.

[0112] In some embodiments of the present disclosure, the communication control unit includes a microprocessor, and serial communication is used between the microprocessor and the control unit.

[0113] In some optional examples, the communication control unit may also be directly coupled to the heating unit to control the heating process of the heating unit.

[0114] In some embodiments of the present disclosure, the inventors further discovered that if the local temperature of the heating unit is too high, it will affect the stability of the heating beam, causing the power of the heating beam to change, which will affect the processing quality.

[0115] Based on this, the laser heating circuit in the embodiment of the present disclosure may further include:

[0116] a temperature detection device, disposed on the heating unit, configured to obtain the temperature of the heating unit and generate a temperature detection signal;

[0117] a control unit, coupled to the temperature detection device, and further configured to determine a current temperature value of the heating unit according to the temperature detection signal, and compare the current temperature value of the heating unit with a preset temperature value to generate a temperature control adjustment signal;

[0118] The temperature regulating unit is coupled to the control unit and is suitable for switching on or off the flow path of the cooling medium to the heating unit according to the temperature control regulation signal, and regulating the flow rate of the cooling medium according to the temperature of the cooling medium and the current temperature value of the heating unit.

[0119] Specifically, during the process of heating the material to be processed, the temperature detection device can detect the temperature of the driver and / or heater in real time, for example, the temperature of the circuit board and lines inside the driver, and the temperature of the circuit board and lines inside the heater, and then output a temperature detection signal corresponding to the temperature of the driver and / or heater to the control unit. The control unit can generate a temperature control adjustment signal to the temperature adjustment unit based on the relationship between the current temperature value contained in the temperature detection signal and the preset temperature value.

[0120] At this time, the temperature regulating unit can, according to the temperature control adjustment signal, enable (for example, the current temperature value exceeds the preset temperature value) or disconnect (for example, the current temperature value is lower than the preset temperature value) the flow path of the cooling medium to the heating unit, and when the flow path is enabled, the flow rate of the cooling medium is adjusted according to the temperature of the cooling medium and the current temperature value of the driver and / or heater to quickly cool down the driver and / or heater, so that the heating unit can operate at a safe temperature, so that the heating light beam output by the heating unit is more stable, thereby improving the processing quality.

[0121] In the embodiment of the present disclosure, the cooling medium may include at least one of water, ethylene glycol, fluorinated liquid and air.

[0122] In a specific embodiment, the temperature regulating unit may be a water chiller system, in which case the cooling medium is water.

[0123] In some embodiments of the present disclosure, the heating stability of the laser heating circuit is further improved and the processing quality of the material to be processed is improved.

[0124] The control unit is further adapted to output a first alarm message when it is determined that the current temperature value of the driver is greater than the preset temperature value; or output a second alarm message when it is determined that the current temperature value of the heater is greater than the preset temperature value.

[0125] By outputting the first alarm information and / or the second alarm information, the operator can be reminded to promptly discover and handle the fault, thereby improving operational safety.

[0126] It can be understood that the above describes multiple embodiment schemes provided by the embodiments of the present disclosure, and the various optional methods introduced in each embodiment scheme can be combined and cross-referenced with each other without conflict, thereby extending a variety of possible embodiment schemes, which can all be considered as embodiment schemes disclosed and disclosed by the present disclosure.

[0127] The embodiment of the present disclosure also provides a laser heating method, which can be applied to the laser heating circuit described in any of the aforementioned examples.

[0128] In some embodiments of the present disclosure, see Figure 6 A flow chart of a laser heating method in an embodiment of the present disclosure is shown in FIG. Figure 6 As shown, the following steps may be included:

[0129] S11, generating a heating control signal in response to an input heating signal;

[0130] S12, in response to the heating control signal, outputting a heating light beam corresponding to the heating control signal to the material to be processed;

[0131] S13, obtaining the temperature of the surface of the material to be processed and generating a corresponding second detection signal;

[0132] Wherein, the second detection signal is used to represent the voltage value corresponding to the current temperature of the surface of the material to be processed;

[0133] S14, generating a corresponding electrical signal based on the second detection signal;

[0134] S15, determining the current temperature of the surface of the material to be processed according to the electrical signal, and generating a corresponding first detection signal;

[0135] S16, adjusting the heating control signal according to the current temperature of the surface of the material to be processed and the target temperature contained in the first detection signal.

[0136] By adopting the laser heating method in the above example, by setting up a detection unit, as well as an adaptive signal processing unit and a communication control unit, the intensity of the heating beams output by multiple heaters can be adjusted, thereby improving the processing quality of the material to be processed while reducing the complexity and implementation cost of the laser heating circuit.

[0137] Although the embodiments of the present disclosure are disclosed as above, the present invention is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A laser heating circuit, characterized in that: include: a control unit configured to generate a heating control signal in response to an input heating signal; and is configured to adjust the heating control signal according to the current temperature and the target temperature of the surface of the material to be processed contained in the first detection signal; A heating unit is coupled to the control unit and is configured to output a heating light beam corresponding to the heating control signal to the material to be processed in response to the heating control signal; the heating unit includes a plurality of drivers and a plurality of heaters, and the drivers and the heaters are coupled one by one; A detection unit is configured to obtain the temperature of the surface of the material to be processed and generate a corresponding second detection signal, wherein the second detection signal is used to represent a voltage value corresponding to the current temperature of the surface of the material to be processed; a signal processing unit, coupled to the detection unit, configured to generate a corresponding electrical signal based on the second detection signal, the signal processing unit comprising: a signal processing module, coupled to the detection unit, configured to convert a voltage value corresponding to the second detection signal into a current value; a conversion module, coupled to the signal processing module and the communication control unit respectively, configured to convert the current value into a voltage value, and use the voltage value as the electrical signal; the signal processing module comprises: an operational amplifier, a bias resistor, a switch device, a first feedback resistor and a second feedback resistor, and an output resistor, wherein: a first end of the operational amplifier is used to receive the voltage value, a second end of the operational amplifier is connected to a first end of the first feedback resistor, and an output end of the operational amplifier is connected to the bias resistor; a second end of the bias resistor is connected to a control end of the switch device; a first end of the switch device is suitable for inputting a power supply voltage through the output resistor and serving as an output end of the signal processing module, a second end of the switch device is respectively connected to a second end of the first feedback resistor and a first end of the second feedback resistor; a second end of the second feedback resistor is grounded; The communication control unit is coupled to the signal processing unit and the control unit respectively, and is configured to determine the current temperature of the surface of the material to be processed according to the electrical signal, and output a corresponding first detection signal to the control unit.

2. The laser heating circuit according to claim 1, characterized in that: The driver is configured to output a driving signal to a corresponding heater according to the heating control signal; The heater is configured to output the heating light beam to one of the areas on the surface of the material to be processed according to the driving signal.

3. The laser heating circuit according to claim 1, characterized in that: The detection unit is configured to obtain the temperature of all areas on the surface of the material to be processed, and generate a corresponding second detection signal based on the average value of the temperature of each area; or, the detection unit is configured to obtain the temperature of one area on the surface of the material to be processed, and generate a corresponding second detection signal based on the temperature of the area.

4. The laser heating circuit according to claim 1, characterized in that: The conversion module comprises a conversion resistor, a first end of the conversion resistor is coupled to the output end of the signal processing module, and a second end of the conversion resistor is coupled to the communication control unit.

5. The laser heating circuit according to claim 1, characterized in that: The communication control unit is configured to determine the temperature corresponding to the electrical signal according to a preset mapping relationship between the electrical signal and the temperature, and use the temperature as the current temperature of the surface of the material to be processed.

6. The laser heating circuit according to claim 1 or 5, characterized in that: The communication control unit includes a microprocessor, and the microprocessor and the control unit communicate with each other in a serial port manner.

7. The laser heating circuit according to claim 1, characterized in that: Also includes: a temperature detection device, disposed on the heating unit, configured to obtain the temperature of the heating unit and generate a temperature detection signal; The control unit is coupled to the temperature detection device and is further configured to determine a current temperature value of the heating unit according to the temperature detection signal, and compare the current temperature value of the heating unit with a preset temperature value to generate a temperature control adjustment signal; The temperature regulating unit is coupled to the control unit and is suitable for switching on or off the flow path of the cooling medium to the heating unit according to the temperature control regulation signal, and regulating the flow rate of the cooling medium according to the temperature of the cooling medium and the current temperature value of the heating unit.

8. A laser heating method, characterized in that: Applied to the laser heating circuit according to any one of claims 1 to 7, the laser heating method comprises: generating a heating control signal in response to an input heating signal; In response to the heating control signal, outputting a heating light beam corresponding to the heating control signal to the material to be processed; Acquiring the temperature of the surface of the material to be processed and generating a corresponding second detection signal, wherein the second detection signal is used to represent a voltage value corresponding to the current temperature of the surface of the material to be processed; Based on the second detection signal, generating a corresponding electrical signal; Determine the current temperature of the surface of the material to be processed according to the electrical signal, and generate a corresponding first detection signal; The heating control signal is adjusted according to the current temperature of the surface of the material to be processed and the target temperature contained in the first detection signal.

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