Temperature control system for laser emission module, heat exchange device and laser emission device

Abstract

The present disclosure discloses a temperature control system, a heat exchange device and a laser emission device for a laser emission module. The laser emission module includes a laser and a heat exchanger. The heat exchanger includes a first end close to the laser for heat exchange with the laser and a second end for heat conduction with the first end. The first end and the second end are respectively the cold end and the hot end of the heat exchanger. The temperature control system includes two temperature detection modules, which are respectively used to detect a first temperature of the first end of the heat exchanger and a second temperature of the second end of the heat exchanger to obtain a first voltage value and a second voltage value corresponding to the two temperatures; a current control module, which is used to respond to the first voltage value being less than the second voltage value, calculate the pressure difference between the two; respond to the pressure difference being greater than or equal to a first pressure difference threshold, and accumulate it into the previous accumulated pressure difference to obtain the current accumulated pressure difference; when the current accumulated pressure difference is greater than or equal to a second pressure difference threshold, provide a current with a current value greater than a preset current value to the heat exchanger. This solution can perform precise temperature adjustment.

Description

Technical Field

[0001] The present disclosure generally relates to the field of laser ablation technology. More specifically, the present disclosure relates to a temperature control system, a heat exchange device, and a laser emission device for a laser emission module. Background Art

[0002] Since biological tissues absorb different wavelengths of lasers differently, the application requirements of multiple-wavelength lasers in the ablation field have increased sharply. Lasers are widely used due to their small size, high efficiency, etc.

[0003] In order to make the laser work properly, generally, a heat exchanger is used to dissipate heat or heat the laser. However, during the process of cooling or heating the laser by the heat exchanger, the temperature will show a certain fluctuation due to some reasons. When the temperature fluctuation is too large, it will affect the working efficiency of the heat exchanger, thereby affecting its temperature control effect on the laser.

[0004] Therefore, there is an urgent need to provide a temperature control system, a heat exchange device, and a laser emission device for a laser emission module, which can perform precise temperature regulation at low cost, thereby ensuring constant temperature control of the laser and ensuring the reliability and accuracy of temperature regulation. Summary of the Invention

[0005] In order to solve at least one or more of the above-mentioned technical problems, the present disclosure provides a temperature control system, a heat exchange device, and a laser emission device for a laser emission module in multiple aspects.

[0006] In a first aspect, the present disclosure provides a temperature control system for a laser emission module. The laser emission module includes a laser and a heat exchanger for performing heat exchange with the laser. The heat exchanger includes a first end close to the laser for heat exchange therewith and a second end for heat conduction with the first end. The temperature control system includes: a first temperature detection module for detecting a first temperature of the first end of the heat exchanger and / or the laser to obtain a first voltage value corresponding to the first temperature; a second temperature detection module for detecting a second temperature of the second end of the heat exchanger to obtain a second voltage value corresponding to the second temperature; and a current control module for: in response to the first voltage value being less than the second voltage value, calculating a first pressure difference between the second voltage value and the first voltage value; in response to the first pressure difference being greater than or equal to a first pressure difference threshold, adding the first pressure difference to a previous cumulative pressure difference to obtain a current cumulative pressure difference, where the previous cumulative pressure difference is the sum of first pressure differences greater than or equal to the first pressure difference threshold obtained before the current detection time point; and when the current cumulative pressure difference is greater than or equal to a second pressure difference threshold, providing a first current with a current value greater than a preset current value to the heat exchanger.

[0007] In some embodiments, the current control module includes: an effective control voltage generation sub-module for: in response to the first voltage value being less than the second voltage value, calculating a first pressure difference between the second voltage value and the first voltage value; in response to the first pressure difference being greater than or equal to the first pressure difference threshold, adding the first pressure difference to the previous cumulative pressure difference to obtain the current cumulative pressure difference; and when the current cumulative pressure difference is greater than or equal to the second pressure difference threshold, outputting an effective control voltage with a first amplitude, where the first amplitude is greater than a preset voltage amplitude; and a heat exchanger power supply sub-module for providing the first current to the heat exchanger according to the control of the effective control voltage.

[0008] In some embodiments, the effective control voltage generation sub-module includes: a first subtraction sub-module for: in response to the first voltage value being less than the second voltage value, calculating the first pressure difference between the second voltage value and the first voltage value; in response to the first pressure difference being greater than or equal to the first pressure difference threshold, adding the first pressure difference to the previous cumulative pressure difference to obtain the current cumulative pressure difference; and outputting a modulation signal when the current cumulative pressure difference is greater than or equal to the second pressure difference threshold; a fundamental wave generation sub-module for generating a fundamental wave with a first operating frequency according to the modulation signal, where the first operating frequency is greater than a preset fundamental wave operating frequency; and a chopping output sub-module for chopping the fundamental wave with a chopping voltage to obtain and output the effective control voltage.

[0009] In some embodiments, when the current cumulative pressure difference is greater than or equal to the second pressure difference threshold, heat dissipation is performed for the second end through a fan; the temperature control system further includes a fan state determination module, which is configured to control the fan to operate at a first operating frequency according to the modulation signal, so as to dissipate heat for the second end at a first rotational speed, wherein the first operating frequency is greater than a preset fan operating frequency.

[0010] In some embodiments, the fan state determination module includes: a controller, which is configured to generate a fan drive signal for controlling the fan to operate at a first operating frequency according to the modulation signal; and a fan drive circuit, which is configured to drive the fan to rotate at a first rotational speed according to the fan drive signal.

[0011] In some embodiments, the temperature control system further includes: a current acquisition module, which is configured to acquire the magnitude of the supply current provided by the fan drive circuit to the fan; and an overload protection module, which is configured to: provide a fan normal operation signal to the fan drive circuit when the supply current is less than or equal to a current threshold, so that the fan drive circuit drives the fan to operate normally according to the fan normal operation signal; and provide a fan stop operation signal to the fan drive circuit when the magnitude of the supply current is greater than the current threshold, so that the fan drive circuit drives the fan to stop rotating according to the fan stop operation signal.

[0012] In some embodiments, the temperature control system further includes: a heat exchanger operation control module, which is configured to control the heat exchanger to operate in a corresponding working state and a corresponding working mode through the heat exchanger power supply sub-module according to the magnitude relationship between a second pressure difference and a third pressure difference, wherein the second pressure difference includes the difference between a first voltage value and the maximum allowable voltage value of the heat exchanger, the third pressure difference includes the difference between the minimum allowable voltage value of the heat exchanger and the first voltage value, wherein the maximum allowable voltage value includes the voltage value corresponding to the maximum allowable temperature of the heat exchanger, and the minimum allowable voltage value includes the voltage value corresponding to the minimum allowable temperature of the heat exchanger.

[0013] In some embodiments, the heat exchanger operation control module includes: a second subtraction sub-module configured to calculate the second pressure difference according to the first voltage value and the maximum allowable voltage value; a third subtraction sub-module configured to calculate the third pressure difference according to the first voltage value and the minimum allowable voltage value; a first voltage generation sub-module configured to generate a first control voltage according to the second pressure difference; a second voltage generation sub-module configured to generate a second control voltage according to the third pressure difference; and a current control sub-module configured to control the power supply sub-module of the heat exchanger to supply a current with a corresponding direction and magnitude to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger operates in a corresponding operating state in a corresponding operating mode.

[0014] In some embodiments, the first voltage generation sub-module includes: a fundamental wave generation circuit configured to generate a fundamental wave; a first chopping voltage determination circuit configured to determine a first chopping voltage according to the second pressure difference and the first voltage values corresponding to a plurality of first temperatures obtained after the current detection time point; and a first chopping circuit configured to chop the fundamental wave according to the first chopping voltage to obtain the first control voltage.

[0015] In some embodiments, the current control sub-module includes: a current direction control circuit configured to control the power supply sub-module of the heat exchanger to supply a current with a corresponding direction to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger operates in a corresponding operating mode; and a current magnitude control circuit configured to control the power supply sub-module of the heat exchanger to supply a current with a corresponding magnitude to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger operates in a corresponding operating state in a corresponding operating mode.

[0016] In some embodiments, the current direction control circuit includes: a first opto-coupler path configured to: conduct when the first control voltage is greater than the second control voltage to control the power supply sub-module of the heat exchanger to supply a current in a first direction to the heat exchanger, so that the heat exchanger operates in an operating mode of cooling or heating the laser through a first end; and turn off when the first control voltage is less than or equal to the second control voltage; and a second opto-coupler path interlocked with the first opto-coupler path and configured to: conduct when the first control voltage is less than the second control voltage to control the power supply sub-module of the heat exchanger to supply a current in a second direction to the heat exchanger, so that the heat exchanger operates in another operating mode of cooling or heating the laser through a first end; and turn off when the first control voltage is greater than or equal to the second control voltage.

[0017] In some embodiments, the temperature control system further includes: a voltage acquisition module configured to acquire the voltage provided by the heat exchanger power supply sub-module to the heat exchanger; and an overvoltage protection module configured to: provide a first control signal to the heat exchanger operation control module when the voltage is less than or equal to a preset voltage value, so that the heat exchanger operation control module determines whether to control the heat exchanger to operate in a corresponding working mode in a corresponding working state according to the magnitude relationship between the second pressure difference and the third pressure difference through the heat exchanger power supply sub-module based on the first control signal; and provide a second control signal to the heat exchanger operation control module when the voltage is greater than the preset voltage value, so that the heat exchanger operation control module determines to stop supplying power to the heat exchanger through the heat exchanger power supply sub-module according to the second control signal.

[0018] In some embodiments, the temperature control system further includes: a current acquisition module configured to acquire the current provided by the heat exchanger power supply sub-module to the heat exchanger; and an overcurrent protection module configured to: provide a third control signal to the heat exchanger operation control module when the current value of the current is less than or equal to a preset current value, so that the heat exchanger operation control module determines whether to control the heat exchanger to operate in a corresponding working mode in a corresponding working state according to the magnitude relationship between the second pressure difference and the third pressure difference through the heat exchanger power supply sub-module based on the third control signal; and provide a fourth control signal to the heat exchanger operation control module when the current value of the current is greater than the preset current value, so that the heat exchanger operation control module stops supplying power to the heat exchanger through the heat exchanger power supply sub-module according to the fourth control signal.

[0019] In some embodiments, the temperature control system further includes a plugging protection module configured to: determine whether the first temperature detection module is normally connected to its power supply circuit according to the first voltage value to determine whether it can normally detect the temperature of the first end of the heat exchanger and / or the laser; when it is determined that the first temperature detection module can normally detect the temperature of the first end of the heat exchanger and / or the laser, provide a fifth control signal to the heat exchanger operation control module, so that the heat exchanger operation control module determines whether to control the heat exchanger to operate in a corresponding working mode in a corresponding working state according to the magnitude relationship between the second pressure difference and the third pressure difference through the heat exchanger power supply sub-module based on the fifth control signal; and when it is determined that the first temperature detection module cannot normally detect the temperature of the first end of the heat exchanger and / or the laser, provide a sixth control signal to the heat exchanger operation control module, so that the heat exchanger operation control module stops supplying power to the heat exchanger through the heat exchanger power supply sub-module according to the sixth control signal.

[0020] In a second aspect, the present disclosure further provides a heat exchange device, including the temperature control system according to any one of the embodiments of the foregoing first aspect.

[0021] In a third aspect, the present disclosure further provides a laser emission device, including the laser emission module according to any one of the embodiments of the foregoing first aspect and the heat exchange device according to the embodiment of the foregoing second aspect.

[0022] Through the temperature control system, heat exchange device and laser emission device provided as above, the working efficiency of the heat exchanger can be improved by adjusting the heat exchanger itself, so that accurate temperature adjustment can be performed while saving costs, and further, constant temperature control of the laser can be ensured. In addition, by using the cumulative result (cumulative pressure difference) as the basis for judging whether to perform temperature adjustment, the problem of inaccurate adjustment caused by using the voltage values corresponding to a single or fewer temperatures for temperature adjustment can be overcome, so that the reliability and accuracy of temperature adjustment can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0024] Figure 1 A schematic block diagram of a temperature control system for a laser emission module according to an embodiment of the present disclosure is shown;

[0025] Figure 2 A schematic block diagram of a temperature control system for a laser emission module according to another embodiment of the present disclosure is shown;

[0026] Figure 3 A schematic block diagram of a temperature control system for a laser emission module according to still another embodiment of the present disclosure is shown;

[0027] Figure 4 A schematic block diagram of a temperature control system for a laser emission module according to still another embodiment of the present disclosure is shown;

[0028] Figure 5 A schematic block diagram of a temperature control system for a laser emission module according to yet another embodiment of the present disclosure is shown;

[0029] Figure 6 A schematic block diagram of a temperature control system for a laser emission module according to an embodiment of the present disclosure is shown;

[0030] Figure 7 A circuit diagram of an optocoupler interlock circuit according to an embodiment of the present disclosure is shown;

[0031] Figure 8 The circuit diagram of the current magnitude control circuit according to an embodiment of the present disclosure is shown;

[0032] Figure 9 The principle block diagram of the heat exchange device according to an embodiment of the present disclosure is shown;

[0033] Figure 10 The principle block diagram of the laser emission device according to an embodiment of the present disclosure is shown. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0035] It should be understood that the terms "including" and "comprising" used in the specification and claims of the present disclosure indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0036] It should also be understood that the terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. As used in the specification and claims of the present disclosure, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms. It should also be further understood that the term "and / or" used in the specification and claims of the present disclosure refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0037] As used in this specification and the claims, the term "if" may be interpreted as "when" or "once" or "in response to determining" or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if detecting [the described condition or event]" may be interpreted as meaning "once determined" or "in response to determining" or "once detecting [the described condition or event]" or "in response to detecting [the described condition or event]" according to the context.

[0038] Next, the detailed implementation manners of the present disclosure will be described in detail in conjunction with the accompanying drawings.

[0039] Figure 1The principle block diagram of a temperature control system 100 for a laser emission module according to an embodiment of the present disclosure is shown.

[0040] In one embodiment, the above-mentioned laser emission module may include a laser and a heat exchanger for heat exchange with the laser, and the heat exchanger includes a first end close to the laser for heat exchange with it and a second end for heat conduction with the first end. In one embodiment, the heat exchanger may include, but is not limited to, a thermoelectric cooler (TEC).

[0041] As Figure 1 shown, the temperature control system 100 may include a first temperature detection module 101, a second temperature detection module 102, and a current control module 103.

[0042] In Figure 1 the shown embodiment, the above-mentioned first temperature detection module 101 may be used to detect the first temperature of the first end of the heat exchanger and / or the laser to obtain a first voltage value corresponding to the first temperature. In one implementation scenario, the first temperature detection module 101 may include a temperature sensor, and the temperature sensor may be arranged inside the laser so as to detect the temperature of the laser, or may be directly in contact with the first end of the heat exchanger so as to detect the temperature of the first end of the heat exchanger. Alternatively, the first temperature detection module 101 may also include two temperature sensors, one of which may be arranged inside the laser and the other may be directly in contact with the first end of the heat exchanger so as to detect the first temperature of the first end of the heat exchanger and the laser. Further, the temperature sensor may include a thermistor, and the thermistor may include an NTC thermistor.

[0043] In Figure 1 the shown embodiment, the above-mentioned second temperature detection module 102 may be used to detect the second temperature of the second end of the heat exchanger to obtain a second voltage value corresponding to the second temperature. Similarly to the above-mentioned first temperature detection module 101, the second temperature detection module 102 may also include a temperature sensor, the temperature sensor may include a thermistor, and further, the thermistor may include an NTC thermistor. In one implementation scenario, the second temperature detection module 102 may be arranged at the second end of the heat exchanger.

[0044] It is understandable that when the temperature difference between the hot and cold ends (the first end and / or the laser, and the second end) of the heat exchanger is less than the allowable temperature difference threshold, it usually has a high working efficiency, while when the above temperature difference is greater than or equal to the temperature difference threshold, its working efficiency will be lower. Therefore, in order to ensure its working efficiency, when the temperature difference between the hot and cold ends of the heat exchanger is greater than or equal to the allowable temperature difference threshold, corresponding adjustments are often required to reduce this temperature difference to less than the allowable temperature difference threshold.

[0045] In one implementation, this adjustment can be made by adjusting the working efficiency of the heat exchanger itself. Based on this, in Figure 1 In the illustrated embodiment, the current control module 103 can be used to calculate a first pressure difference between the second voltage value and the first voltage value in response to the first voltage value being less than the second voltage value (at this time, the heat exchanger cools the laser through the first end, that is, the heat exchanger is in the cooling mode). Generally, here, the voltage difference obtained by subtracting the first voltage value from the second voltage value, or the absolute value of the voltage difference obtained by subtracting the second voltage value from the first voltage value, is calculated to obtain the first pressure difference.

[0046] In response to the above first pressure difference being greater than or equal to the first pressure difference threshold, the first pressure difference is accumulated into the previously accumulated pressure difference to obtain the current accumulated pressure difference. The first pressure difference threshold here can be specifically set according to requirements. For example, it can be a voltage value corresponding to a temperature of 1 °C or 2 °C, etc. of the heat exchanger. By setting the limit condition of the first pressure difference threshold, precise adjustment (fine adjustment) of the temperature difference of the heat exchanger can be achieved. The previously accumulated pressure difference here can be the sum of the first pressure differences greater than or equal to the first pressure difference threshold obtained before the current detection time point. According to the operating conditions of the heat exchanger, the previously accumulated pressure difference can include only one first pressure difference, or the sum of multiple (such as two or three) first pressure differences.

[0047] After obtaining the current accumulated pressure difference, when the current accumulated pressure difference is greater than or equal to the second pressure difference threshold, the current control module 103 can provide a first current with a current value greater than the preset current value to the heat exchanger. The second pressure difference threshold here can be the voltage value corresponding to the allowable temperature difference threshold of the heat exchanger, which can vary according to different heat exchangers. For example, it can be a voltage value corresponding to a temperature of 10 °C or 15 °C, etc. of the heat exchanger. The preset current value here can be specifically set according to needs. The current corresponding to the preset current value can be the magnitude of the power supply current of the heat exchanger when the previously accumulated pressure difference of the heat exchanger is less than the second pressure difference threshold, that is, the current when the temperature difference between the hot and cold ends of the heat exchanger is less than the allowable temperature threshold.

[0048] The difference between the preset current value and the current value of the first current can be relatively small, so that when the current cumulative pressure difference is greater than or equal to the second pressure difference threshold, the magnitude of the power supply current of the heat exchanger can be finely adjusted. For example, it can be adjusted from 2 amperes (preset current value) to 2.2 amperes (current value of the first current). Through this fine adjustment, the temperature difference between the cold and hot ends of the heat exchanger can be accurately adjusted, so as to restore it to a higher working efficiency (such as refrigeration efficiency).

[0049] It can be seen from this that this solution can improve the working efficiency of the heat exchanger through its own adjustment, so that accurate temperature adjustment can be carried out while saving costs, and then the constant temperature control of the laser can be ensured. In addition, using the cumulative result (cumulative pressure difference) as the basis for judging whether to perform temperature adjustment can overcome the problem of inaccurate adjustment caused by using the voltage value corresponding to a single or fewer temperatures for temperature adjustment, so as to ensure the reliability and accuracy of temperature adjustment.

[0050] The above current control module 103 can be implemented through a variety of circuit structures. For example, in one implementation, it can control the magnitude of the current supplied to the heat exchanger by generating an effective control voltage. Figure 2 The principle block diagram of a temperature control system 200 for a laser emission module according to another embodiment of the present disclosure is shown.

[0051] As Figure 2 shown in, the current control module 103 may include an effective control voltage generation sub-module 201 and a heat exchanger power supply sub-module 202. In this embodiment, the amplitude of the effective control voltage may be proportional to the magnitude of the current supplied to the heat exchanger.

[0052] In this embodiment, the above-mentioned effective control voltage generation sub-module 201 can be used to calculate the first pressure difference between the second voltage value and the first voltage value in response to the first voltage value being less than the second voltage value; in response to the first pressure difference being greater than or equal to the first pressure difference threshold, accumulate the first pressure difference into the previous cumulative pressure difference to obtain the current cumulative pressure difference. These two steps have been described in the foregoing embodiments and will not be elaborated here. When the current cumulative pressure difference is greater than or equal to the second pressure difference threshold, an effective control voltage with a first amplitude is output, where the first amplitude may be greater than the preset voltage amplitude. The preset voltage amplitude can be specifically set as needed. The voltage corresponding to the preset voltage amplitude can be the voltage generated by the effective control voltage generation sub-module 201 when the previous cumulative pressure difference of the heat exchanger is less than the second pressure difference threshold, that is, the voltage generated by the effective control voltage generation sub-module 201 when the temperature difference between the cold and hot ends of the heat exchanger is less than the allowable temperature difference threshold (second temperature difference threshold).

[0053] The above-mentioned heat exchanger power supply electronic module can be used to supply the above-mentioned first current to the heat exchanger according to the control of the effective control voltage. Thus, this solution can be used to control and increase the power supply current of the heat exchanger by increasing the voltage amplitude of the effective control voltage, and this control method is simple and easy to implement.

[0054] The above-mentioned effective control voltage generation sub-module 201 can be implemented by various circuit structures. For example, it can be implemented by chopping the fundamental wave. Figure 3 The principle block diagram of a temperature control system 300 for a laser emission module according to another embodiment of the present disclosure is shown.

[0055] As Figure 3 As shown in, the effective control voltage generation sub-module 201 can include a first subtraction sub-module 301, a fundamental wave generation sub-module 302, and a chopping output sub-module 303. In this embodiment, the above-mentioned first subtraction sub-module 301 can be used to calculate the first pressure difference between the second voltage value and the first voltage value in response to the first voltage value being less than the second voltage value; in response to the first pressure difference being greater than or equal to the first pressure difference threshold, accumulate the first pressure difference into the previously accumulated pressure difference to obtain the current accumulated pressure difference. Then, it can output a modulation signal when the current accumulated pressure difference is greater than or equal to the second pressure difference threshold.

[0056] In one implementation, the first subtraction sub-module 301 can include a third subtractor and a third integration circuit. The third subtractor can be electrically connected to the first temperature detection module 101 and the second temperature detection module 102 respectively, and is used to calculate the first pressure difference between the second voltage value and the first voltage value in response to the first voltage value being less than the second voltage value. The third subtractor can use an existing subtractor.

[0057] The third integration circuit can be electrically connected to the third subtractor and is used to accumulate the first pressure difference into the previously accumulated pressure difference to obtain the current accumulated pressure difference and output a modulation signal when the current accumulated pressure difference is greater than or equal to the second pressure difference threshold in response to the first pressure difference being greater than or equal to the first pressure difference threshold. The third integration circuit can use an existing integration circuit.

[0058] The above fundamental wave generation sub-module 302 can be used to generate a fundamental wave with a first operating frequency according to the above modulation signal, where the first operating frequency is greater than a preset fundamental wave operating frequency. The preset fundamental wave operating frequency can be specifically set as needed, and the fundamental wave corresponding to the preset fundamental wave operating frequency can be the fundamental wave generated by the fundamental wave generation sub-module 302 when the previously accumulated pressure difference of the heat exchanger is less than a second pressure difference threshold, that is, the fundamental wave generated when the temperature difference between the hot and cold ends of the heat exchanger is less than the allowable temperature difference threshold. The fundamental wave generation sub-module 302 can generate, for example, a sine wave. In one implementation, the fundamental wave generation sub-module 302 can include a time base chip electrically connected to the above third integration circuit, and the time base chip can include, for example, a 555 time base chip.

[0059] The above chopping output sub-module 303 can be used to chop the fundamental wave using a chopping voltage to obtain the above effective control voltage and output it. The chopping voltage can be generated by a corresponding chopping voltage generation circuit. It can be seen that this solution can increase the voltage amplitude of the effective control voltage by increasing the operating frequency of the fundamental wave (that is, this solution achieves precise control of the chopping voltage by fine-tuning the operating frequency of the fundamental wave), thereby increasing the current value of the supply current provided to the heat exchanger. This control method is simple and easy to implement.

[0060] The above describes a solution for adjusting the temperature difference between the hot and cold ends of a heat exchanger by adjusting the heat exchanger itself in combination with the embodiments. It can be understood that in another implementation, when the current accumulated pressure difference is greater than or equal to the second pressure difference threshold, a radiator and a fan arranged on the radiator can also be used to dissipate heat from the second end. For example, the radiator can be in contact with the heat exchanger to dissipate heat from its second end, and the fan can dissipate heat from the radiator, so that the heat conducted to the radiator can be dissipated by the operation of the fan, thereby improving the efficiency of adjusting the temperature difference of the heat exchanger.

[0061] Figure 4 The principle block diagram of a temperature control system 400 for a laser emission module according to another embodiment of the present disclosure is shown. As Figure 4 shown, the temperature control system can further include a fan state determination module 401, which can be used to control the fan to operate at a first operating frequency according to the above modulation signal to dissipate heat from the second end at a first rotational speed, where the first operating frequency is greater than a preset fan operating frequency (the operating frequency and rotational speed of the fan are proportional).

[0062] The preset fan operating frequency can be specifically set as needed, and the preset fan operating frequency can be the operating frequency of the fan when the previously accumulated pressure difference of the heat exchanger is less than the second pressure difference threshold, that is, the operating frequency of the fan when the temperature difference between the hot and cold ends of the heat exchanger is less than the allowable temperature difference threshold.

[0063] Thus, it can be seen that this solution can accelerate the heat dissipation of the second end of the heat exchanger by increasing the rotation speed of the fan, thereby improving the recovery efficiency of the operating state of the heat exchanger.

[0064] The fan state determination module 401 can be implemented through various circuit structures. For example, in one embodiment, the fan state determination module 401 can include a controller and a fan drive circuit. The controller can be used to generate a fan drive signal for controlling the fan to operate at a first operating frequency according to the above modulation signal. In one implementation, the fan can include, but is not limited to, a PWM fan. Therefore, the fan drive signal can include a PWM square wave signal with a corresponding width. The controller can be implemented through various control elements or control circuits, such as an MCU.

[0065] The above fan drive circuit can be used to drive the fan to rotate at a first rotation speed according to the fan drive signal. The fan drive circuit can adopt an existing drive circuit. When the fan includes a PWM fan, the drive circuit can be a PWM drive circuit, so that the rotation speed of the fan can be adjusted according to the change in the width of the PWM square wave, thereby achieving relatively simple control.

[0066] To improve the heat dissipation efficiency of the fan, in one embodiment, two fans arranged on the radiator can jointly dissipate heat from the second end of the heat exchanger. The two fans can be arranged at two ventilation ports of the radiator. The first fan can be used to suck natural wind into the radiator, and the second fan can be used to extract hot air from the radiator. Based on this, the controller can be used to generate a fan drive signal for controlling the first fan to operate at a first operating frequency according to the above modulation signal, and can also be used to generate another fan drive signal for controlling the second fan to operate at a second operating frequency according to the above modulation signal, so that the two fans can rotate at a first rotation speed and a second rotation speed according to the corresponding fan drive signals. The first operating frequency and the second operating frequency can be equal or unequal, so that the first rotation speed and the second rotation speed can be equal or unequal.

[0067] To prevent damage to the fan caused by fan jamming or the like, in one embodiment, the temperature control system can further include a current acquisition module and an overload protection module. The current acquisition module can be used to obtain the magnitude of the supply current provided by the above fan drive circuit to the fan. The current acquisition module can be implemented through an existing current acquisition circuit.

[0068] The above overload protection module can be used to provide a normal fan operation signal to the fan drive circuit when the supply current is less than or equal to the current threshold, so that the fan drive circuit can drive the fan to operate normally according to the normal fan operation signal. The current threshold can vary according to different fans. This indicates that no abnormal conditions such as fan jamming have occurred. In addition, the overload protection module can also provide a fan stop operation signal to the fan drive circuit when the magnitude of the supply current is greater than the current threshold, so that the fan drive circuit can drive the fan to stop operating according to the fan stop operation signal. This indicates that abnormal conditions such as fan jamming have occurred.

[0069] Thus, it can be seen that this solution can only operate normally when no abnormal conditions such as fan jamming occur, thereby preventing abnormal conditions such as jamming from damaging the fan and further affecting its service life.

[0070] In order to make the fan operate only when the above multiple normal operation conditions are met, thereby improving the safe operation level of the fan, in another embodiment, the above controller, overload protection module, and fan drive circuit can be respectively electrically connected to a logic AND circuit. When the overload protection module generates a normal fan operation signal, the logic AND circuit obtains a high-level signal. When the overload protection module generates a fan stop operation signal, the logic AND circuit obtains a low-level signal. When the controller generates any fan drive signal for driving the fan to operate, the logic AND circuit obtains a high-level signal. When the controller generates a fan stop drive signal for driving the fan to stop operating, the logic AND circuit obtains a low-level signal.

[0071] When the logic AND circuit obtains two high-level signals, each module connected to the logic AND circuit can output a signal to the fan drive circuit, so that the fan can be normally driven and adjusted. Correspondingly, when any one of the level signals obtained by the logic AND circuit is a low-level signal, any module connected to the logic AND circuit cannot output a signal to the fan drive circuit, and at this time the fan does not operate. The logic AND circuit can include but is not limited to a logic AND gate. Thus, it can be seen that this solution can ensure the safe operation of the fan through the control of the logic AND circuit.

[0072] In the foregoing, solutions for the case of an excessive temperature difference between the cold and hot ends of the heat exchanger were described in combination with embodiments. Next, the working control method of the heat exchanger will be described in detail in combination with embodiments. It can be understood that when the first temperature is within the allowable temperature fluctuation range, the heat exchanger neither needs to refrigerate nor heat. When the first temperature exceeds this allowable temperature fluctuation range (for example, is lower than the lowest allowable temperature of the allowable temperature fluctuation range or higher than the highest allowable temperature of the allowable temperature fluctuation range), the heat exchanger can enter the refrigeration mode or the heating mode to refrigerate or heat the laser so as to maintain the laser at a constant temperature. That is, when the first voltage value is within the allowable voltage fluctuation range, the heat exchanger neither needs to refrigerate nor heat. When the first voltage value exceeds the allowable voltage fluctuation range (for example, is lower than the lowest allowable voltage value of the allowable voltage fluctuation range or higher than the highest allowable voltage value of the allowable voltage fluctuation range), the heat exchanger can enter the refrigeration mode or the heating mode to refrigerate or heat the laser.

[0073] Figure 5 FIG. 4 shows a schematic block diagram of a temperature control system 500 for a laser emission module according to still another embodiment of the present disclosure. As Figure 5 shown therein, the temperature control system may further include a heat exchanger working control module 501. The heat exchanger working control module 501 may be configured to control the heat exchanger to work in a corresponding working state in a corresponding working mode through the heat exchanger power supply sub-module 202 according to the magnitude relationship between the second pressure difference and the third pressure difference.

[0074] Wherein, the second pressure difference may include the difference between the first voltage value and the highest allowable voltage value of the heat exchanger, and the third pressure difference may include the difference between the lowest allowable voltage value of the heat exchanger and the first voltage value. The highest allowable voltage value and the lowest allowable voltage value here may be the voltage values corresponding to the maximum value and the minimum value of the above-mentioned allowable temperature fluctuation range, respectively.

[0075] For the convenience of calculation, when calculating the second pressure difference and the third pressure difference, if the difference is negative, the corresponding pressure difference result can be 0. Based on this, assuming that the allowable temperature fluctuation range is 23°C to 27°C, the allowable voltage fluctuation range can be, for example, 7V (the lowest allowable voltage value) to 10V (the highest allowable voltage value). When the first temperature is 25°C, the first voltage value can be 8V, the second pressure difference can be 8V - 10V = 0, and the third pressure difference can be 7V - 8V = 0. When the first temperature is 20°C, the first voltage value is 11V, the second pressure difference can be 11V - 10V = 1, and the third pressure difference can be 7V - 11V = 0V. When the first temperature is 30°C, the first voltage value is 5V, the second pressure difference can be 5V - 10V = 0V, and the third pressure difference can be 7V - 5V = 2. It can be understood that the corresponding relationship between the first temperature and the first voltage value here is merely exemplary rather than restrictive, and the above calculations can also be performed according to other corresponding relationships between temperature and voltage values.

[0076] When the second pressure difference is equal to the third pressure difference, it indicates that the temperature at the first end of the heat exchanger and / or the temperature of the laser is within the allowable temperature fluctuation range, and at this time, the heat exchanger does not need to be cooled or heated. For example, when both the second pressure difference and the third pressure difference are 0, the heat exchanger does not require a cooling mode or a heating mode.

[0077] When the second pressure difference is greater than the third pressure difference, it indicates that the temperature at the first end of the heat exchanger and / or the temperature of the laser is higher than the highest allowable temperature. At this time, the heat exchanger needs to enter the cooling mode to cool the laser. For example, when the second pressure difference is 1V and the third pressure difference is 0, the heat exchanger performs cooling.

[0078] When the second pressure difference is less than the third pressure difference, it indicates that the temperature at the first end of the heat exchanger and / or the temperature of the laser is lower than the lowest allowable temperature. At this time, the heat exchanger needs to enter the heating mode to heat the laser. For the above example, when the second pressure difference is 0 and the third pressure difference is 2V, the heat exchanger performs heating.

[0079] It can be understood that when the difference between the second pressure difference and the third pressure difference is large, it indicates that the deviation of the temperature at the first end of the heat exchanger and / or the temperature of the laser from the extreme values (the highest allowable temperature and the lowest allowable temperature) of the allowable temperature fluctuation range is greater. At this time, a larger supply current can be controlled to be provided to the heat exchanger, so that the heat exchanger can have a higher cooling or heating capacity, thereby improving the efficiency of its temperature regulation. Correspondingly, when the difference between the second pressure difference and the third pressure difference is small, it indicates that the deviation of the temperature at the first end of the heat exchanger and / or the temperature of the laser from the extreme values (the highest allowable temperature and the lowest allowable temperature) of the allowable temperature fluctuation range is smaller. At this time, a smaller supply current can be controlled to be provided to the heat exchanger, so that the heat exchanger can regulate the temperature with a lower efficiency.

[0080] It can be seen that this solution can determine the working mode and working state of the heat exchanger based on whether the temperature at the first end of the heat exchanger and / or the laser is within the allowable temperature fluctuation range and its magnitude relationship (i.e., the first voltage value and the allowable voltage fluctuation range), so as to maintain constant temperature control of the laser.

[0081] The above-mentioned heat exchanger working control module 501 can be implemented by various circuit structures. Figure 6 The principle block diagram of the temperature control system 600 for a laser emission module according to an embodiment of the present disclosure is shown. As Figure 6 shown, the heat exchanger working control module 501 may include a second subtraction sub-module 601, a third subtraction sub-module 603, a first voltage generation sub-module 602, a second voltage generation sub-module 604, and a current control sub-module 605.

[0082] The above-mentioned second subtraction sub-module 601 can be used to calculate the second pressure difference according to the first voltage value and the maximum allowable voltage value of the heat exchanger. For example, for the previous example, when the first voltage value is 8V, the second subtraction sub-module 601 can calculate 8V - 10V = 0. In an implementation scenario, the second subtraction sub-module 601 may include a second subtractor, and the second subtractor may adopt an existing subtractor.

[0083] The above-mentioned third subtraction sub-module 603 can be used to calculate the third pressure difference according to the first voltage value and the minimum allowable voltage value of the heat exchanger. For example, for the previous example, when the first voltage value is 8V, the third subtraction sub-module 603 can calculate 7V - 8V = 0. In an implementation scenario, the third subtraction sub-module 603 may include a third subtractor, and the third subtractor may adopt an existing subtractor.

[0084] The above-mentioned first voltage generation sub-module 602 can be used to generate a first control voltage according to the second pressure difference. The first voltage generation sub-module 602 can be implemented by various circuit structures. For example, in an embodiment, the first voltage generation sub-module 602 may include a fundamental wave generation circuit, a first chopping voltage determination circuit, and a first chopping circuit.

[0085] The above-mentioned fundamental wave generation circuit can be used to generate a fundamental wave, and the fundamental wave can be, for example, a sine wave. In addition, the fundamental wave generation circuit may include a time base chip, such as a 555 time base chip. To simplify the structure of the temperature control system of this solution, the fundamental wave generation circuit here can adopt the same circuit structure as the aforementioned fundamental wave generation sub-module 302.

[0086] The above-mentioned first chopping voltage determination circuit can be used to determine the first chopping voltage according to the second pressure difference and the first voltage values corresponding to multiple first temperatures obtained after the current detection time point. The number of first temperatures obtained after the current detection time point can be specifically determined according to needs, for example, it can be 3, 4, etc. Therefore, the first voltage values for determining the first chopping voltage can also be multiple, such as 3, 4, etc.

[0087] Using the cumulative result of multiple voltage values as the basis for determining the working mode and working state of the heat exchanger can overcome the inaccuracy of the determination result caused by a single or fewer voltage values, thereby enabling accurate control of the working mode and working state of the heat exchanger.

[0088] In one embodiment, the above-mentioned first chopping voltage determination circuit may include a first integration circuit and a first amplifier. The first integration circuit may be electrically connected to the second subtraction sub-module 601 and is used to integrate the second pressure difference and the pressure difference calculated from multiple first voltage values obtained after the current detection time point (calculated in the same way as calculating the second pressure difference) to obtain an integration result. The first amplifier may be electrically connected to the second subtraction sub-module 601 and is used to amplify the second pressure difference, so that the first chopping voltage can be determined according to the above integration result and the amplified second pressure difference.

[0089] The above-mentioned first chopping circuit can be used to chop the fundamental wave according to the above-mentioned first chopping voltage to obtain a first control voltage. The first chopping circuit can adopt an existing chopping circuit. The first chopping circuit can chop the sine wave of the fundamental wave into a square wave, so as to provide a DC voltage for subsequent modules.

[0090] The above-mentioned second voltage generation sub-module 604 can be used to generate a second control voltage according to the third pressure difference. The second voltage generation sub-module 604 can be implemented by using the same or similar circuit structure as the above-mentioned first voltage generation sub-module 602, that is, it may include a fundamental wave generation circuit, a second chopping voltage determination circuit, and a second chopping circuit. To simplify the circuit structure, the fundamental wave generation circuit here can use the same circuit as the fundamental wave generation circuit of the first voltage generation sub-module 602.

[0091] The above-mentioned second chopping voltage determination circuit can be used to determine the second chopping voltage according to the third pressure difference and a plurality of the above-mentioned first voltage values obtained after the current detection time point. In one embodiment, the second chopping voltage determination circuit can include a second integration circuit and a second amplifier, where the second integration circuit can be electrically connected to the third subtraction sub-module 603 and is used to integrate the third pressure difference and the pressure difference calculated from a plurality of first voltage values obtained after the current detection time point (calculated in the same way as calculating the third pressure difference) to obtain an integration result. The second amplifier can be electrically connected to the third subtraction sub-module 603 and is used to amplify the third pressure difference, so that the second chopping voltage can be determined according to the integration result and the amplified third pressure difference.

[0092] The above-mentioned second chopping circuit can be used to chop the fundamental wave according to the above-mentioned second chopping voltage to obtain a second control voltage. The second chopping circuit can adopt an existing chopping circuit, and the second chopping circuit can also chop the sine wave of the fundamental wave into a square wave, so as to provide a DC voltage for subsequent modules.

[0093] The above-mentioned current control sub-module 605 can be used to control the heat exchanger power supply sub-module 202 to provide current with corresponding direction and magnitude to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger operates in the corresponding working state in the corresponding working mode. The heat exchanger power supply sub-module 202 here can include the power supply circuit of the heat exchanger.

[0094] Since the relationship between the control voltage and the pressure difference is corresponding, when the first control voltage and the second control voltage are equal, it means that the second pressure difference is equal to the third pressure difference. At this time, the heat exchanger neither cools nor heats; when the first control voltage is greater than the second control voltage, it means that the second pressure difference is greater than the third pressure difference, and the heat exchanger needs to enter the cooling mode; when the first control voltage is less than the second control voltage, it means that the second pressure difference is less than the third pressure difference, and the heat exchanger needs to enter the heating mode.

[0095] In addition, the above-mentioned pressure difference is proportional to the magnitude of the corresponding control voltage, that is, the greater the pressure difference, the greater the generated control voltage. Therefore, when the difference between the second pressure difference and the third pressure difference is large, a larger supply current can be controlled to be provided to the heat exchanger; correspondingly, when the difference between the second pressure difference and the third pressure difference is small, a smaller supply current can be controlled to be provided to the heat exchanger, so that the working state of the heat exchanger can be controlled according to the magnitude relationship between the first control voltage and the second control voltage.

[0096] It can be seen from this that this solution can reflect the relationship between the first voltage value and the allowable voltage fluctuation range through the control voltage, so that the working mode and working state of the heat exchanger can be controlled according to the voltage. This control method is simple and easy to implement.

[0097] According to the above description, in this solution, the coarse adjustment of the temperature difference of the heat exchanger is realized through the heat exchanger operation control module and the heat exchanger power supply sub-module. This coarse adjustment only controls the chopping voltage, and achieves the precise control of the chopping voltage by finely adjusting the operating frequency of the fundamental wave, so as to realize the accurate constant temperature control of the heat exchanger.

[0098] According to the above description, the current control sub-module 605 can control the magnitude and direction of the current supplied to the heat exchanger. Therefore, in one embodiment, the current control sub-module 605 can be implemented by two independent circuits for controlling the current direction and magnitude. Such a setting facilitates the separate modification and replacement of the two independent circuits, thereby reducing the maintenance cost of the current control sub-module 605.

[0099] Specifically, the current control sub-module 605 may include a current direction control circuit and a current magnitude control circuit. The current direction control circuit can be used to control the heat exchanger power supply sub-module 202 to supply current in the corresponding direction to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger operates in the corresponding operating mode.

[0100] The current direction control circuit can be implemented by various circuit structures. For example, it can be implemented by a relatively reliable optocoupler interlock circuit. Specifically, in one embodiment, the current direction control circuit may include a first optocoupler path and a second optocoupler path.

[0101] The above-mentioned first optocoupler path can be used to conduct when the first control voltage is greater than the second control voltage, so as to control the heat exchanger power supply sub-module 202 to supply current in the first direction to the heat exchanger, so that the heat exchanger operates in one of the operating modes of cooling or heating the laser through the first end (such as the cooling mode). In addition, in order to prevent supplying current in the first direction to the heat exchanger when the first control voltage is less than or equal to the second control voltage, the first optocoupler path can be turned off when the first control voltage is less than or equal to the second control voltage.

[0102] The above-mentioned second optocoupler path can be interlocked with the first optocoupler path, and can be used to conduct when the first control voltage is less than the second control voltage, so as to control the heat exchanger power supply sub-module 202 to supply current in the second direction to the heat exchanger, so that the heat exchanger operates in the other operating mode of cooling or heating the laser through the first end (such as the heating mode). At this time, in order to prevent supplying only current in the second direction to the heat exchanger when the first control voltage is greater than or equal to the second control voltage, the second optocoupler path can be turned off when the first control voltage is greater than or equal to the second control voltage.

[0103] The above-mentioned optocoupler interlock circuit can be implemented through Figure 7 the circuit structure in Figure 7The circuit diagram of the optocoupler interlock circuit according to an embodiment of the present disclosure is shown. As shown in the figure, the first optocoupler path may include a first optocoupler U1 and a second optocoupler U2, and the second optocoupler path may include a third optocoupler U3 and a fourth optocoupler U4. The output Ctrl_S1 of the above-mentioned first voltage generation sub-module 602 is connected to the anode of the light-emitting diode in the first optocoupler U1 through a resistor, connected to the anode of the light-emitting diode in the second optocoupler U2 through a resistor, connected to the cathode of the light-emitting diode in the third optocoupler U3 through a resistor, and connected to the cathode of the light-emitting diode in the fourth optocoupler U4 through a resistor. One output terminal of the photosensitive triode of the first optocoupler U1 is grounded, one output terminal of the photosensitive triode of the second optocoupler U2 is connected to the power supply, one output terminal of the photosensitive triode of the third optocoupler U3 is grounded, and one output terminal of the photosensitive triode of the fourth optocoupler U4 is connected to the power supply. In addition, the above four optocouplers may use linear couplers.

[0104] Correspondingly, the output Ctrl_S2 of the above-mentioned second voltage generation sub-module 604 is connected to the cathode of the light-emitting diode in the first optocoupler U1 through a resistor, connected to the cathode of the light-emitting diode in the second optocoupler U2 through a resistor, connected to the anode of the light-emitting diode in the third optocoupler U3 through a resistor, and connected to the anode of the light-emitting diode in the fourth optocoupler U4 through a resistor. The outputs of the photosensitive triodes in the above four optocouplers may be used as the outputs of the optocoupler interlock circuit, which are output 1, output 2, output 3, and output 4 respectively.

[0105] In this circuit, when the first control voltage is greater than the second control voltage, the first optocoupler U1 and the second optocoupler U2 are turned on, so that the heat exchanger power supply sub-module 202 can supply current in the first direction to the heat exchanger. When the first control voltage is less than or equal to the second control voltage, the first optocoupler U1 and the second optocoupler U2 are turned off, so that the heat exchanger power supply sub-module 202 cannot supply current in the second direction to the heat exchanger.

[0106] Similarly, when the first control voltage is less than the second control voltage, the third optocoupler U3 and the fourth optocoupler U4 are turned on, so that the heat exchanger power supply sub-module 202 can supply current in the second direction to the heat exchanger. When the first control voltage is greater than or equal to the second control voltage, the third optocoupler U3 and the fourth optocoupler U4 are turned off, so that the heat exchanger power supply sub-module 202 cannot supply current in the first direction to the heat exchanger.

[0107] It can be seen that the circuit structure of the optocoupler interlock circuit of the present solution is simple and can reliably control the current direction of the current supplied to the heat exchanger, so that the reliable control of the working mode of the heat exchanger can be realized.

[0108] Further, the current direction control circuit may further include an H-bridge drive circuit. Figure 8 The circuit diagram of the H-bridge drive circuit according to an embodiment of the present disclosure is shown. As shown in the figure, it may include a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, and a fourth MOS transistor Q4. In this embodiment, the first MOS transistor Q1 and the second MOS transistor Q2 are P-channel MOS transistors, and the third MOS transistor Q3 and the fourth MOS transistor Q4 are N-channel MOS transistors.

[0109] The other output terminal (i.e., output 1) of the photosensitive triode in the first optocoupler U1 is connected to the gate of the first MOS transistor Q1 through a resistor R1, and the other output terminal (i.e., output 2) of the photosensitive triode in the second optocoupler U2 is connected to the gate of the fourth MOS transistor Q4 through a resistor R7. The other output terminal (i.e., output 3) of the photosensitive triode in the third optocoupler U3 is connected to the gate of the second MOS transistor Q2 through a resistor R2, and the other output terminal (i.e., output 4) of the photosensitive triode in the fourth optocoupler U4 is connected to the gate of the third MOS transistor Q3 through a resistor R6. The H-bridge drive circuit is also connected to a power supply, and the heat exchanger is connected between the two output terminals TEC+ and TEC— of the H-bridge drive circuit.

[0110] For this H-bridge drive circuit, when the first optocoupler path is turned on (the first optocoupler U1 outputs a low level, and the second optocoupler U2 outputs a high level), and the second optocoupler path is turned off (the third optocoupler U3 outputs a high level, and the fourth optocoupler U4 outputs a low level), the first MOS transistor Q1 and the fourth MOS transistor Q4 are turned on, and the second MOS transistor Q2 and the third MOS transistor Q3 are turned off, so as to provide a current in a first direction for the heat exchanger. Correspondingly, when the above first optocoupler path is turned off (the first optocoupler U1 outputs a high level, and the second optocoupler U2 outputs a low level), and the second optocoupler path is turned on (the third optocoupler U3 outputs a low level, and the fourth optocoupler U4 outputs a high level), the first MOS transistor Q1 and the fourth MOS transistor Q4 are turned off, and the second MOS transistor Q2 and the third MOS transistor Q3 are turned on, so as to provide a current in a second direction for the heat exchanger. Thus, reliable control of the current direction can be achieved by combining this H-bridge drive circuit.

[0111] In addition, the control of the current magnitude can also be achieved through the H-bridge drive circuit. Specifically, the greater the difference between the first control voltage and the second control voltage, the greater the opening degrees of the above four MOS transistors, so that a larger current can be provided for the heat exchanger; correspondingly, the smaller the difference between the first control voltage and the second control voltage, the smaller the opening degrees of the above four MOS transistors, so that a smaller current can be provided for the heat exchanger. Thus, reliable control of the current magnitude provided to the heat exchanger can be achieved, so that the heat exchanger can operate in a corresponding working mode in a corresponding working state.

[0112] In the foregoing, the structures and principles of the current direction control circuit and the current magnitude control circuit have been described in combination with the embodiments. It can be understood that based on different application scenarios, the above-mentioned current control sub-module 605 can also be implemented by other circuit structures, which will not be elaborated here.

[0113] To protect the heat exchanger, the temperature control system can also perform one or more of overvoltage protection, overcurrent protection, and plugging protection on the heat exchanger. The following will separately describe them in this solution.

[0114] When performing overvoltage protection, the temperature control system can include a voltage acquisition module and an overvoltage protection module. The voltage acquisition module can be used to acquire the voltage provided by the power supply sub-module 202 of the heat exchanger to the heat exchanger. The voltage acquisition module can be implemented by an existing voltage acquisition circuit.

[0115] The above-mentioned overvoltage protection module can be used to provide a first control signal to the heat exchanger operation control module 501 when the voltage is less than or equal to a preset voltage value, so that the heat exchanger operation control module 501 determines whether to control the heat exchanger to operate in a corresponding operating mode in a corresponding operating state according to the magnitude relationship between the second pressure difference and the third pressure difference based on the first control signal. At this time, it can be determined that the power supply situation of the heat exchanger is normal.

[0116] The above-mentioned overvoltage protection module can also provide a second control signal to the heat exchanger operation control module 501 when the voltage is greater than the preset voltage value, so that the heat exchanger operation control module 501 determines to stop supplying power to the heat exchanger through the power supply sub-module 202 according to the second control signal. The preset voltage value here can be the safe voltage for the heat exchanger to operate. The overvoltage protection module can be implemented by an existing overvoltage protection circuit. At this time, it can be determined that the power supply situation of the heat exchanger is abnormal.

[0117] Thus, it can be seen that this solution can only have the possibility of normal operation when the power supply situation of the heat exchanger is normal, thereby preventing the heat exchanger from being damaged due to abnormal power supply.

[0118] When performing overcurrent protection, the temperature control system can include a current acquisition module and an overcurrent protection module. The current acquisition module can be used to acquire the current provided by the power supply sub-module 202 of the heat exchanger to the heat exchanger. The current acquisition module can be implemented by an existing current acquisition circuit.

[0119] The above overcurrent protection module can be used to provide a third control signal to the heat exchanger operation control module 501 when the current value of the current is less than or equal to a preset current value, so that the heat exchanger operation control module 501 determines whether to control the heat exchanger to operate in a corresponding operating mode in a corresponding operating state according to the magnitude relationship between the second pressure difference and the third pressure difference through the heat exchanger power supply sub-module 202. At this time, it can be determined that the power supply situation of the heat exchanger is normal.

[0120] The overcurrent protection module can also provide a fourth control signal to the heat exchanger operation control module 501 when the current value of the current is greater than the preset current value, so that the heat exchanger operation control module 501 stops supplying power to the heat exchanger through the heat exchanger power supply sub-module 202 according to the fourth control signal. The preset current value here can be the safe current for the heat exchanger to operate. The overcurrent protection module can be implemented by an existing overcurrent protection circuit. At this time, it can be determined that the power supply situation of the heat exchanger is abnormal.

[0121] It can be seen that this solution can only have the possibility of normal operation when the power supply situation of the heat exchanger is normal, thereby preventing the heat exchanger from being damaged due to abnormal power supply.

[0122] When performing plug-and-play protection, the temperature control system can include a plug-and-play protection module, which can be used to determine whether the first temperature detection module 101 is properly connected to its power supply circuit according to the first voltage value, so as to determine whether it can normally detect the temperature of the first end of the heat exchanger and / or the laser. In an implementation scenario, when the first voltage value is greater than or equal to a preset voltage value, it can be determined that the first temperature detection module 101 is properly connected to its power supply circuit, and the first temperature at this time is the actual temperature of the first end of the heat exchanger and / or the laser. Correspondingly, when the first voltage value is less than the preset voltage value, it can be determined that the first temperature detection module 101 is not properly connected to its power supply circuit, and the first temperature at this time is a preset temperature (the temperature generated at the first end of the heat exchanger and / or the laser when the heat exchanger is not working) rather than the actual temperature. The preset temperature can be specifically set according to needs.

[0123] Next, when it is determined that the first temperature detection module 101 can normally detect the temperature of the first end of the heat exchanger and / or the laser, the plugging protection module can provide a fifth control signal to the heat exchanger operation control module 501, so that the heat exchanger operation control module 501 determines whether to control the heat exchanger to operate in a corresponding operating mode in a corresponding operating state according to the magnitude relationship between the second pressure difference and the third pressure difference based on the fifth control signal. Additionally, when it is determined that the first temperature detection module 101 cannot normally detect the temperature of the first end of the heat exchanger and / or the laser, it can provide a sixth control signal to the heat exchanger operation control module 501, so that the heat exchanger operation control module 501 stops supplying power to the heat exchanger through the heat exchanger power supply sub-module 202 according to the sixth control signal.

[0124] It can be seen that this solution can perform normal temperature control only when it is determined that the first temperature is the actual temperature of the heat exchanger, thereby preventing incorrect control of the temperature control system caused by incorrect temperatures, and further affecting the accuracy of its temperature control.

[0125] The plugging protection module can include a comparator and a control circuit including a triode. The comparator can be electrically connected to the first temperature detection module 101 and the control circuit respectively, and it can be used to compare the magnitudes of the first voltage value and the preset voltage value. When the first voltage value is greater than or equal to the preset voltage value, it can output a first level signal (which can drive the triode to conduct) to the triode of the control circuit, so that the control circuit provides a fifth control signal to the heat exchanger operation control module 501. Correspondingly, when the first voltage value is less than the preset voltage value, it can output a second level signal (which can drive the triode to cut off) to the triode of the control circuit, so that the control circuit provides a sixth control signal to the heat exchanger operation control module 501.

[0126] When protecting the heat exchanger through the above overvoltage protection function, overcurrent protection function, and plugging protection at the same time, the above overvoltage protection module, overcurrent protection module, plugging protection module, and heat exchanger operation control module 501 can be electrically connected to a logic AND circuit respectively. When the overvoltage protection module outputs a first control signal, the logic AND circuit can obtain a high-level signal; when the overvoltage protection module outputs a second control signal, the logic AND circuit can obtain a low-level signal. When the overcurrent protection module outputs a third control signal, the logic AND circuit can obtain a high-level signal; when the overcurrent protection module outputs a fourth control signal, the logic AND circuit can obtain a low-level signal. When the plugging protection module outputs a fifth control signal, the logic AND circuit can obtain a high-level signal, and when the plugging protection module outputs a sixth control signal, the logic AND circuit can obtain a low-level signal.

[0127] When all the signals obtained by the logical AND circuit are high-level signals, each module connected to the logical AND circuit can output signals to the heat exchanger operation control module 501, enabling it to operate normally. Correspondingly, when any one of the level signals obtained by the logical AND circuit is a low-level signal, any module connected to the logical AND circuit cannot output a signal to the heat exchanger operation control module 501, so that the heat exchanger cannot operate normally. Thus, through this logical AND circuit, the common control of overvoltage, overcurrent, and plugging protection of the heat exchanger can be achieved, thereby enabling more reliable and accurate control of the heat exchanger.

[0128] It can be understood that only an example in which the laser emission module includes a heat exchanger and a laser is used to illustrate the temperature control system in the above text. In some embodiments, the laser emission module may further include two heat exchangers and two lasers. The two heat exchangers can be cooled by a radiator and a fan arranged on the radiator. At this time, the temperature control system may include a controller (i.e., the aforementioned controller) and two fan drive circuits to adjust the operating frequency of the fan. Based on this, the controller can adjust the operating frequency of the fan according to the current cumulative pressure difference that is first greater than or equal to the second pressure difference threshold among the two current cumulative pressure differences corresponding to the two heat exchangers, so as to ensure the constant temperature control of each laser.

[0129] Each module in the temperature control system of this solution can be implemented by a hardware circuit, so that compared with the implementation method through software, the reliability of circuit operation can be improved and the control method can be simplified (no need to adjust parameters).

[0130] Figure 9 The schematic block diagram of a heat exchange device 900 according to an embodiment of the present disclosure is shown.

[0131] As Figure 9 As shown in , the heat exchange device 900 may include the temperature control system 901 according to any of the foregoing embodiments. The first temperature detection module 910, the second temperature detection module 920, and the current control module 930 therein have been described in detail in combination with multiple embodiments in the foregoing text and will not be elaborated here.

[0132] According to the description of the temperature control system in the foregoing text, it can be known that the heat exchange device 900 of this solution can improve its working efficiency by adjusting the heat exchanger itself, so that accurate temperature adjustment can be performed while saving costs, and further, the constant temperature control of the laser can be ensured. In addition, using the cumulative result (cumulative pressure difference) as the basis for judging whether to perform temperature adjustment can overcome the problem of inaccurate adjustment caused by using a single or fewer voltage values corresponding to temperatures for temperature adjustment, thereby ensuring the reliability and accuracy of temperature adjustment.

[0133] Figure 10 The schematic block diagram of a heat exchange device 1000 according to an embodiment of the present disclosure is shown.

[0134] As Figure 10 shown, the laser emission device 1000 may include a laser emission module 1001 and a heat exchange device 1002 according to any of the foregoing embodiments. The first temperature detection module 1010, the second temperature detection module 1020, and the current control module 1030 in the heat exchange device 1002 have been described in detail in combination with multiple embodiments in the foregoing text and will not be elaborated herein.

[0135] According to the description of the heat exchange device in the foregoing text, it can be known that the heat exchange device 1000 of the present solution can improve its working efficiency by adjusting the heat exchanger itself, so as to perform precise temperature adjustment at the cost of saving, and further ensure the constant temperature control of the laser. In addition, by using the cumulative result (cumulative pressure difference) as the basis for judging whether to perform temperature adjustment, the problem of inaccurate adjustment caused by using the voltage values corresponding to a single or fewer temperatures for temperature adjustment can be overcome, so as to ensure the reliability and accuracy of temperature adjustment.

[0136] Although multiple embodiments of the present disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art can think of many changes, alterations, and alternative ways without departing from the spirit and scope of the present disclosure. It should be understood that various alternative embodiments of the present disclosure described herein may be adopted in the practice of the present disclosure. The appended claims are intended to define the scope of protection of the present disclosure and thus cover equivalents or alternatives within the scope of these claims.

Claims

1. A temperature control system for a laser emission module, the laser emission module comprising a laser and a heat exchanger for performing heat exchange with the laser, and the heat exchanger comprising a first end close to the laser for performing heat exchange with it and a second end for performing heat conduction with the first end, the first end and the second end being the cold end and the hot end of the heat exchanger respectively, characterized in that, The temperature control system includes: A first temperature detection module, which is used to detect a first temperature at a first end of the heat exchanger to obtain a first voltage value corresponding to the first temperature; A second temperature detection module, which is used to detect a second temperature at a second end of the heat exchanger to obtain a second voltage value corresponding to the second temperature; and A current control module, which is used to: In response to the first voltage value being less than the second voltage value, calculate a first pressure difference between the second voltage value and the first voltage value; In response to the first pressure difference being greater than or equal to a first pressure difference threshold, accumulate the first pressure difference into a previous accumulated pressure difference to obtain a current accumulated pressure difference, where the previous accumulated pressure difference is the sum of accumulated first pressure differences greater than or equal to the first pressure difference threshold obtained before the current detection time point; and When the current accumulated pressure difference is greater than or equal to a second pressure difference threshold, provide a first current with a current value greater than a preset current value to the heat exchanger.

2. The temperature control system for a laser emission module according to claim 1, wherein Wherein the current control module includes: An effective control voltage generation sub-module, which is used to: In response to the first voltage value being less than the second voltage value, calculate a first pressure difference between the second voltage value and the first voltage value; In response to the first pressure difference being greater than or equal to the first pressure difference threshold, accumulate the first pressure difference into the previous accumulated pressure difference to obtain the current accumulated pressure difference; and When the current accumulated pressure difference is greater than or equal to the second pressure difference threshold, output an effective control voltage with a first amplitude, where the first amplitude is greater than a preset voltage amplitude; and A heat exchanger power supply sub-module, which is used to provide the first current to the heat exchanger according to the control of the effective control voltage.

3. The temperature control system for a laser emission module according to claim 2, characterized in that, Wherein the effective control voltage generation sub-module includes: A first subtraction sub-module, which is used to: In response to the first voltage value being less than the second voltage value, calculate a first pressure difference between the second voltage value and the first voltage value; In response to the first pressure difference being greater than or equal to the first pressure difference threshold, accumulate the first pressure difference into the previous accumulated pressure difference to obtain the current accumulated pressure difference; and Output a modulation signal when the current accumulated pressure difference is greater than or equal to the second pressure difference threshold: A fundamental wave generation sub-module, which is used to generate a fundamental wave with a first operating frequency according to the modulation signal, where the first operating frequency is greater than a preset fundamental wave operating frequency; and A chopping output sub-module, which is used to chop the fundamental wave with a chopping voltage to obtain and output the effective control voltage.

4. The temperature control system for a laser emission module according to claim 3, characterized in that, Cool the second end through a fan when the current accumulated pressure difference is greater than or equal to the second pressure difference threshold; The temperature control system further includes a fan state determination module, which is used to control the fan to operate at a first operating frequency according to the modulation signal to cool the second end at a first rotational speed, where the first operating frequency is greater than a preset fan operating frequency.

5. The temperature control system for a laser emission module according to claim 4, wherein Wherein the fan state determination module includes: A controller, which is used to generate a fan drive signal for controlling the fan to operate at the first operating frequency according to the modulation signal; and A fan drive circuit, which is used to drive the fan to rotate at the first rotational speed according to the fan drive signal.

6. The temperature control system for a laser emission module according to claim 5, characterized in that It also includes: A current acquisition module, which is used to obtain the magnitude of the power supply current provided by the fan drive circuit to the fan; And An overload protection module, which is used for: When the power supply current is less than or equal to the current threshold, providing a normal operation signal of the fan to the fan drive circuit, so that the fan drive circuit drives the fan to operate normally according to the normal operation signal of the fan; And When the magnitude of the power supply current is greater than the current threshold, providing a stop operation signal of the fan to the fan drive circuit, so that the fan drive circuit drives the fan to stop operating according to the stop operation signal of the fan.

7. The temperature control system for a laser emission module according to claim 2, characterized in that, It further includes: A heat exchanger operation control module, which is used to control the heat exchanger to work in a corresponding working state and working mode through the heat exchanger power supply sub-module according to the magnitude relationship between the second pressure difference and the third pressure difference, Wherein, the second pressure difference includes the difference between the first voltage value and the maximum allowable voltage value of the heat exchanger, and the third pressure difference includes the difference between the minimum allowable voltage value of the heat exchanger and the first voltage value, Wherein the maximum allowable voltage value includes the voltage value corresponding to the maximum allowable temperature of the heat exchanger, and the minimum allowable voltage value includes the voltage value corresponding to the minimum allowable temperature of the heat exchanger.

8. The temperature control system for a laser emission module according to claim 7, wherein Wherein the heat exchanger operation control module includes: A second subtraction sub-module, which is used to calculate the second pressure difference according to the first voltage value and the maximum allowable voltage value; A third subtraction sub-module, which is used to calculate the third pressure difference according to the first voltage value and the minimum allowable voltage value; A first voltage generation sub-module, which is used to generate a first control voltage according to the second pressure difference; A second voltage generation sub-module, which is used to generate a second control voltage according to the third pressure difference; and A current control sub-module, which is used to control the heat exchanger power supply sub-module to provide a current with a corresponding direction and magnitude to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger works in a corresponding working state and working mode.

9. The temperature control system for a laser emission module according to claim 8, characterized in that, Wherein the first voltage generation sub-module includes: A fundamental wave generation circuit, which is used to generate a fundamental wave; A first chopping voltage determination circuit, which is used to determine a first chopping voltage according to the second pressure difference and the first voltage values corresponding to a plurality of first temperatures obtained after the current detection time point; and A first chopping circuit, which is used to chop the fundamental wave according to the first chopping voltage to obtain the first control voltage.

10. The temperature control system for a laser emission module according to claim 8, wherein, Wherein the current control sub-module includes: A current direction control circuit, which is used to control the heat exchanger power supply sub-module to provide a current with a corresponding direction to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger works in a corresponding working mode; and A current magnitude control circuit, which is used to control the heat exchanger power supply sub-module to provide a current with a corresponding magnitude to the heat exchanger according to the magnitude relationship between the first control voltage and the second control voltage, so that the heat exchanger works in a corresponding working state and working mode.

11. The temperature control system for a laser emission module according to claim 10, characterized in that, Wherein the current direction control circuit includes: The first optocoupler path is used for: conducting when the first control voltage is greater than the second control voltage to control the power supply sub-module of the heat exchanger to supply current in the first direction to the heat exchanger, so that the heat exchanger operates in one of the working modes of cooling or heating the laser through the first end; and turning off when the first control voltage is less than or equal to the second control voltage; and The second optocoupler path is interlocked with the first optocoupler path and is used for: conducting when the first control voltage is less than the second control voltage to control the power supply sub-module of the heat exchanger to supply current in the second direction to the heat exchanger, so that the heat exchanger operates in the other working mode of cooling or heating the laser through the first end; and turning off when the first control voltage is greater than or equal to the second control voltage.

12. The temperature control system for a laser emission module according to claim 7, characterized in that, It further includes: a voltage acquisition module for acquiring the voltage provided by the power supply sub-module of the heat exchanger to the heat exchanger; and an overvoltage protection module for: providing a first control signal to the heat exchanger operation control module when the voltage is less than or equal to a preset voltage value, so that the heat exchanger operation control module determines whether to control the heat exchanger to operate in a corresponding working mode in a corresponding working state according to the magnitude relationship between the second pressure difference and the third pressure difference through the power supply sub-module of the heat exchanger according to the first control signal; and providing a second control signal to the heat exchanger operation control module when the voltage is greater than the preset voltage value, so that the heat exchanger operation control module determines to stop supplying power to the heat exchanger through the power supply sub-module of the heat exchanger according to the second control signal.

13. The temperature control system for a laser emission module according to claim 7, characterized in that, It further includes: a current acquisition module for acquiring the current provided by the power supply sub-module of the heat exchanger to the heat exchanger; and an overcurrent protection module for: providing a third control signal to the heat exchanger operation control module when the current value of the current is less than or equal to a preset current value, so that the heat exchanger operation control module determines whether to control the heat exchanger to operate in a corresponding working mode in a corresponding working state according to the magnitude relationship between the second pressure difference and the third pressure difference through the power supply sub-module of the heat exchanger according to the third control signal; and providing a fourth control signal to the heat exchanger operation control module when the current value of the current is greater than the preset current value, so that the heat exchanger operation control module stops supplying power to the heat exchanger through the power supply sub-module of the heat exchanger according to the fourth control signal.

14. The temperature control system for a laser emission module according to claim 7, 12 or 13, characterized in that, It further includes a plugging protection module for: judging whether the first temperature detection module is normally connected to its power supply circuit according to the first voltage value to determine whether it can normally detect the temperature of the first end of the heat exchanger; When it is determined that the first temperature detection module can normally detect the temperature of the first end of the heat exchanger, a fifth control signal is provided to the heat exchanger operation control module, so that the heat exchanger operation control module determines whether to control the heat exchanger to operate in a corresponding working mode in a corresponding working state according to the magnitude relationship between the second pressure difference and the third pressure difference through the power supply sub-module of the heat exchanger; and When it is determined that the first temperature detection module cannot normally detect the temperature of the first end of the heat exchanger, a sixth control signal is provided to the heat exchanger operation control module, so that the heat exchanger operation control module stops supplying power to the heat exchanger through the power supply sub-module of the heat exchanger according to the sixth control signal.

15. A heat exchange device, characterized in that, Including the temperature control system for the laser emission module according to any one of claims 1-14.

16. A laser emission device, characterized in that, Including: The heat exchange device according to claim 15.

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