Semiconductor laser driving circuit and driving method thereof

Abstract

The invention relates to the technical field of semiconductor lasers, in particular to a semiconductor laser driving circuit which comprises an upper computer, a controller internal module, a constant-current driving circuit and a constant-temperature driving circuit. The upper computer is connected with the controller internal module, the controller internal module is respectively connected with the constant-current driving circuit and the constant-temperature driving circuit, and the constant-current driving circuit and the constant-temperature driving circuit are both connected with the semiconductor laser; the controller internal module comprises a fault detection and identification module, and the fault detection and identification module is connected with the constant-current driving circuit and the constant-temperature driving circuit; and the fault detection and identification module is used for monitoring the constant-current driving circuit and the constant-temperature driving circuit in real time, feeding back monitoring information and displaying the monitoring information to the upper computer. The laser driving circuit has the functions of automatic disconnection, fault early warning and fault prompting, can quickly position a problem and cut off a power supply when a fault occurs, improves the maintenance efficiency, can immediately cut off the power supply of the laser when the circuit fails, and improves the safety of the laser.

Description

Technical Field

[0001] The present application relates to the technical field of semiconductor lasers, and in particular to a semiconductor laser driving circuit and a driving method thereof. Background Art

[0002] A laser is a device that can emit laser light, and semiconductor lasers, with their small size, excellent electro-optical conversion efficiency and economical cost-effectiveness, play an important role in many high-end application scenarios, including lidar, precision sensing and advanced industrial manufacturing.

[0003] Semiconductor lasers are sensitive devices that rely on precise working conditions and need to operate at specified currents and temperatures to avoid damage. Existing laser drive circuits are often only equipped with an overcurrent cutoff function, lacking real-time monitoring and fault diagnosis of the laser status. When the current output to the laser is found to be over-limited, the circuit will stop outputting the drive current to the laser, but before the circuit stops outputting the drive current, the laser has already received the over-limit current signal. The laser itself is very fragile, and a high-frequency sharp pulse can cause it to be damaged. A single overcurrent cutoff function cannot actually ensure the safety of the laser, and the laser drive circuit needs to be designed with more predictable functions.

[0004] Temperature control is critical to laser performance. Although existing PID control algorithms can regulate temperature, parameter adjustment is complex and adjustment becomes difficult once the circuit design is completed, limiting the flexibility and accuracy of temperature control.

[0005] In addition, the existing drive circuit lacks the ability to communicate with the host computer, which affects the convenience of remote control and status feedback. Summary of the invention

[0006] In view of one or more of the problems existing in the prior art, the present application provides a semiconductor laser driving circuit in a first aspect, including a host computer, a controller internal module, a constant current driving circuit and a constant temperature driving circuit;

[0007] The host computer is connected to the internal module of the controller, the internal module of the controller is respectively connected to the constant current drive circuit and the constant temperature drive circuit, and the constant current drive circuit and the constant temperature drive circuit are both connected to the semiconductor laser;

[0008] The internal module of the controller includes a fault detection and identification module, which is connected to the constant current drive circuit, the constant temperature drive circuit and the host computer respectively, and is used to monitor the constant current drive circuit and the constant temperature drive circuit in real time, and feed back and present the monitoring information to the host computer.

[0009] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the internal module of the controller also includes an addressing and encoding module, which is connected to the host computer and is used to encode instructions and data corresponding to the current parameter information set by the host computer, generate first data information and first address information, and is also used to encode instructions and data corresponding to the temperature parameter information set by the host computer, generate second data information and second address information.

[0010] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the internal module of the controller also includes a PWM module, which is connected to the addressing and encoding module and the constant current driving circuit respectively, and is used to receive the first data information and the first address information from the addressing and encoding module, generate a PWM control signal with a specified duty cycle, and send the PWM control signal to the constant current driving circuit.

[0011] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the constant current driving circuit is connected to the PWM module and the semiconductor laser respectively, and is used to drive the semiconductor laser to operate within the set current parameter range after receiving the PWM control signal.

[0012] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the internal module of the controller also includes a PID module, which is connected to the addressing and encoding module and the constant temperature driving circuit respectively, and is used to receive the second data information and the second address information from the addressing and encoding module, generate a PID control signal, and send the PID control signal to the constant temperature driving circuit.

[0013] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the constant temperature driving circuit is connected to the PID module and the semiconductor laser respectively, and is used to drive the semiconductor laser to operate within the set temperature parameter range after receiving the PID control signal.

[0014] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the semiconductor laser driving circuit also includes a temperature measurement circuit, which is respectively connected to the PID module and the thermistor in the semiconductor laser, and is used to detect the temperature of the semiconductor laser and send it to the PID module.

[0015] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the PID module is also used to obtain a semiconductor laser temperature signal in real time through the temperature measurement circuit to perform closed-loop control of the constant temperature driving circuit.

[0016] According to a semiconductor laser driving circuit provided by an embodiment of the present application, the constant temperature driving circuit is connected to the TEC in the semiconductor laser and is used to control the current passing through the TEC to adjust the temperature of the semiconductor laser.

[0017] A second aspect of the present application provides a semiconductor laser driving method, which is applied to the above circuit, and comprises:

[0018] The current parameters and temperature parameters of the semiconductor laser are set by the host computer, and the corresponding instructions and data are transmitted to the internal module of the controller;

[0019] The internal module of the controller encodes and processes the instructions and data corresponding to the received current parameter information and the temperature parameter information, and finally generates a control signal, and transmits it to the constant current drive circuit and the constant temperature drive circuit;

[0020] The constant current driving circuit and the constant temperature driving circuit receive the control signal and drive the semiconductor laser to operate within the preset current parameter range and the preset temperature parameter range;

[0021] The fault detection and identification module monitors the output current and working status information of the constant current drive circuit and the constant temperature drive circuit in real time, and feeds back the monitoring information to the host computer.

[0022] One or more of the above embodiments of the present application have at least the following beneficial effects:

[0023] The semiconductor laser drive circuit has the functions of automatic disconnection, fault warning and fault prompting, which can quickly locate the problem and cut off the power supply when a fault occurs, thus improving the maintenance efficiency. Moreover, when a circuit fault occurs, it can automatically stop the output to the laser and cut off the power supply to the laser immediately, thus improving the safety of the laser.

[0024] By controlling the laser output through the host computer, efficient and accurate laser parameter setting and fast control response can be achieved; at the same time, the host computer in the system can realize comprehensive detection of the laser status and the corresponding laser drive circuit status, and can continuously monitor the operation of the laser system, so as to achieve early prevention of system failures, ensure the stable operation of the laser system and improve the maintenance efficiency when system failures occur;

[0025] The digital PID module is controlled by inputting relevant parameters through the host computer to achieve precise control of the laser constant temperature drive circuit. Compared with the traditional analog PID method, the control method is more intuitive and flexible, with higher temperature precision control, better anti-interference ability, better scalability and maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the structure of a semiconductor laser driving circuit provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] Embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, and the components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed for protection, but merely represents selected embodiments of the present application.

[0029] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] The following will be combined Figure 1 The technical solution of the present application is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0033] See also Figure 1 , a semiconductor laser driving circuit provided in the first aspect of the present application comprises a host computer, an internal module of a controller, a constant current driving circuit and a constant temperature driving circuit;

[0034] The host computer, as the interactive interface between the user and the control system, provides an intuitive operating platform that allows the user to set specific current and temperature parameters according to application requirements. Users can easily configure parameters by inputting, selecting, or adjusting sliders on the graphical user interface (GUI) of the host computer. These parameters can be constant values ​​or dynamic curves that change over time to adapt to different control strategies, which is not limited in this application;

[0035] The internal modules of the controller are connected to the constant current drive circuit and the constant temperature drive circuit respectively. Once the parameters are set, the host computer encodes these parameters into instructions and data packets through communication protocols such as serial communication (RS-232), Ethernet (TCP / IP) or USB, and then sends them to the internal modules of the controller. After receiving this information, the internal modules of the controller decode it and process it in combination with the FPGA logic design module to generate corresponding control signals, which are then sent to the constant current drive circuit and the constant temperature drive circuit;

[0036] The constant current driving circuit and the constant temperature driving circuit are connected to the semiconductor laser. The constant current driving circuit adjusts the output current to ensure that the semiconductor laser operates within the set current parameter range; while the constant temperature driving circuit controls the temperature of the laser to keep it operating within the set temperature range.

[0037] The constant current drive circuit can specifically use the constant current drive circuit LT3932, and the constant temperature drive circuit can specifically use the constant temperature drive circuit ADN8831;

[0038] A fault detection and identification module is designed in the FPGA of the internal module of the controller. The fault detection and identification module is connected to the constant current drive circuit, the constant temperature drive circuit and the host computer respectively. It can detect many key parameters of the semiconductor laser and feed them back to the host computer, including but not limited to the working condition of the drive circuit, temperature, semiconductor cooler (TEC) voltage, etc.

[0039] The fault detection and identification module monitors the important I / O signals of the constant current drive circuit and the constant temperature drive circuit in real time to judge the working state of the drive circuit in real time. The I / O signals include but are not limited to the power supply voltage, the same-direction input voltage of a certain amplifier, etc., and these I / O signals are combined for analysis to identify the working state of the circuit, such as normal operation, short circuit at a certain operational amplifier, etc. When a circuit fault is identified, the metal oxide semiconductor field effect transistor (MOSFET) between the circuit and the semiconductor laser is immediately turned off to isolate the laser from the faulty circuit and stop the circuit at the same time. The semiconductor laser itself is easily affected by the environment and may also be damaged due to non-drive circuit factors. Therefore, the fault detection and identification module will also monitor the key parameters of the semiconductor laser in real time. When it is found that the laser parameters deviate from the set normal range, it will immediately cooperate with the constant current drive circuit to stop the semiconductor laser from working to protect the safety of the semiconductor laser and the surrounding environment.

[0040] After detecting a fault, the fault detection and identification module can automatically execute various fault response measures. At the same time, the module will also send corresponding warning signals to the host computer through the serial port in real time and record specific fault information, such as laser temperature over-limit, TEC drive voltage over-limit, short circuit of an operational amplifier in the constant current drive circuit, etc., which makes it easy for technicians to quickly locate the source of the problem and greatly improves maintenance efficiency.

[0041] The semiconductor laser driving circuit provided in the present application realizes efficient and accurate control of the laser output through the host computer, ensuring fast parameter setting and control response; moreover, the operating status of the laser and its driving circuit can be displayed through the host computer interface, realizing early fault prevention and stable operation; it can also identify abnormal conditions before failure and give early warning, help adjust parameters according to actual needs, optimize system output efficiency, and extend service life; when a system failure occurs, the host computer interface promptly prompts fault information, assists in quickly locating the problem, and improves maintenance efficiency; in addition, the host computer has a rich user interface and powerful control logic, provides fast and flexible operation, and adapts to complex and diverse application scenarios.

[0042] The semiconductor laser driving circuit in the present application integrates multiple functions such as automatic disconnection, fault warning and fault prompt to enhance the safety and maintenance efficiency of the circuit.

[0043] Further, according to a preferred embodiment of the present application, the internal module of the controller also includes an addressing and encoding module, which is connected to the host computer and is responsible for encoding instructions and data corresponding to the current and temperature parameter information transmitted from the host computer.

[0044] The addressing and encoding module can encode the received current parameter information and convert it into first data information and first address information corresponding thereto. Similarly, for the temperature parameter information, it can also convert it into second data information and second address information. This process can ensure the accurate transmission of parameter information.

[0045] The semiconductor laser drive circuit provided by the present application ensures accurate control of current and temperature parameters by encoding the instructions and data corresponding to the current and temperature parameter information transmitted from the host computer through the addressing and encoding module, and meets the strict requirements of the semiconductor laser for working conditions. Through the real-time monitoring function of the fault detection and identification module and the rapid feedback mechanism of fault information, abnormal situations can be discovered and responded to in a timely manner, avoiding potential damage risks, and enabling operators to quickly understand the system status, thereby improving the efficiency of problem handling.

[0046] Further, according to a preferred embodiment of the present application, the internal module of the controller also includes a PWM module, and the PWM module is connected to the addressing and encoding module to receive the first data information and the corresponding first address information generated by the addressing and encoding module.

[0047] The PWM module can calculate and generate a PWM control signal with a specific duty cycle according to the first data information and the corresponding first address information. The duty cycle is the ratio of the high level state in the PWM signal to the entire cycle. By adjusting the duty cycle, the PWM module can finely control the current passing through the constant current drive circuit to ensure that the laser obtains a stable operating current.

[0048] The PWM module is also connected to the constant current drive circuit to send the generated PWM control signal to the constant current drive circuit. The PWM control signal becomes a direct instruction to adjust the output of the constant current drive circuit, which directly affects the working state of the laser. The constant current drive circuit adjusts the output according to the PWM control signal to match the required current level, thereby achieving precise control of the laser current.

[0049] In addition, the PWM module can quickly respond to the update of the addressing and encoding modules to achieve real-time control.

[0050] Further, according to a preferred embodiment of the present application, the constant current drive circuit is connected to the PWM module and the semiconductor laser respectively, and the constant current drive circuit can receive the PWM control signal sent by the PWM module and can accurately control the current flowing through the semiconductor laser. The constant current drive circuit has a high degree of responsiveness, can change according to the PWM control signal, adjust the output current in real time, and ensure that the semiconductor laser operates within the current parameter range set by the user.

[0051] When the fault detection and identification module detects a circuit fault or abnormality, the PWM module cooperates with the constant current drive circuit to quickly adjust its output or even completely cut off the current to protect the laser from damage and make the drive circuit system stable and reliable.

[0052] In some embodiments, a current fuse may be connected between the laser and the constant current drive module to provide double protection and avoid over-limit of the laser supply current.

[0053] Furthermore, according to a preferred embodiment of the present application, the internal module of the controller also includes a PID module, which is connected to the addressing and encoding module and the constant temperature drive circuit, and is responsible for receiving second data information and second address information containing a temperature setting value from the addressing and encoding module, and generating a PID control signal from this information after calculation and processing, and sending the signal to the constant temperature drive circuit to adjust its output, thereby ensuring that the semiconductor laser operates stably within the temperature range set by the user.

[0054] The drive circuit provided in the present application inputs relevant parameters such as proportional coefficient, integral time and differential time through the upper computer interface, and controls the digital PID module to achieve precise control of the laser constant temperature drive circuit, providing a more intuitive and flexible operation method, higher temperature control accuracy and excellent anti-interference ability than the traditional analog PID method, and can also effectively filter out external interference such as electromagnetic noise to ensure the stability of temperature control.

[0055] The PID parameters can be easily adjusted through the host computer interface, which simplifies the tedious manual adjustment process of the traditional analog PID circuit and improves the intuitiveness and flexibility of the operation. The circuit system adopts standardized communication protocols and interface design, making the digital PID module easy to integrate with other devices and systems, enhancing the scalability of the system. In addition, the modular design reduces the difficulty and cost of maintenance, providing a guarantee for the long-term stable operation of the laser.

[0056] The connection design of the host computer, communication module, addressing and encoding module, PID module, and constant temperature drive circuit allows the user to set parameters and monitor the process through the host computer interface. At the same time, with the fault detection mechanism, it can automatically adjust or trigger protection measures under abnormal circumstances, enhancing the reliability of the system and the user's convenience.

[0057] Furthermore, the constant temperature drive circuit is a key component to ensure that the semiconductor laser operates stably within a specific temperature parameter range. It is connected to the PID module and receives and responds to the control signal generated by the PID algorithm. It is also connected to the semiconductor refrigerator (TEC) in the semiconductor laser. According to the PID control signal sent by the PID module, the constant temperature drive circuit accurately adjusts the working state of the TEC to produce the desired cooling or heating effect, thereby dynamically controlling the temperature of the semiconductor laser.

[0058] The above process ensures that the laser can operate stably within the temperature parameter range set by the user. No matter how the external environment changes, the coordinated work of the PID module and the constant temperature drive circuit can ensure the precise control of the internal temperature of the laser, thereby optimizing the performance of the laser and extending its service life.

[0059] Further, according to a preferred embodiment of the present application, the semiconductor laser driving circuit also includes a temperature measurement circuit, which is connected to the thermistor and PID module inside the semiconductor laser. The temperature measurement circuit can sense the temperature change of the laser during operation through the thermistor, and can accurately convert the temperature change into an electrical signal, and then transmit these signals to the PID module. This process ensures the real-time and accuracy of the temperature data, and provides the PID module with real-time feedback for regulating the temperature, so that the entire system can respond to temperature changes in a timely manner.

[0060] The PID module uses the temperature signal obtained from the temperature measurement circuit to implement a closed-loop control strategy and dynamically adjust the output of the constant temperature drive circuit. The PID module can accurately calculate the necessary adjustment amount to compensate for the deviation between the actual temperature and the set temperature. This intelligent temperature closed-loop control mechanism improves the stability and reliability of semiconductor lasers, ensures that the laser can maintain an ideal operating temperature under various working conditions, extends the service life of the laser, and improves the flexibility of operation and the automation level of the system.

[0061] The second aspect of the present application proposes an innovative semiconductor laser driving method, the method comprising:

[0062] The user sets the operating current and temperature parameters of the laser on the host computer, and the host computer transmits the instructions and data of these parameters to the addressing and encoding module through the communication module;

[0063] The addressing and encoding module converts the current and temperature parameter information into two different sets of data and address information, namely the first data information and the first address information, and the second data information and the second address information. The first set of information is sent to the PWM module to control the current supply of the laser; while the second set of information is sent to the PID module to adjust the temperature of the laser. This separate processing method improves the response speed and control accuracy of the system;

[0064] After receiving the first data information and the first address information, the PWM module generates a PWM control signal with a specified duty cycle according to the information. The PWM control signal is the key to the constant current drive circuit to adjust the current. It determines the current obtained by the laser, thereby affecting the output power of the laser;

[0065] The PID module also uses the PID algorithm to calculate the required control signal based on the received second data information and second address information, and sends it to the constant temperature drive circuit. This signal instructs the constant temperature drive circuit to adjust the temperature to ensure that the laser works within the set temperature range;

[0066] After receiving the control signals from the PWM module and the PID module, the constant current drive circuit and the constant temperature drive circuit work together to accurately drive the semiconductor laser to operate within the preset current and temperature parameter range. This closed-loop control ensures the stability and reliability of the laser, while also improving the overall performance of the system;

[0067] In order to further improve the safety and reliability of the system, the method also includes using a fault detection and identification module to monitor the output current and working status of the constant current drive circuit and the constant temperature drive circuit in real time. Once any abnormal situation is detected, such as current or temperature exceeding the preset range, the fault detection and identification module will immediately feed back this information to the host computer, and the operator can quickly take corresponding measures to prevent potential damage and ensure the continuous and stable operation of the system.

[0068] It should be noted that the technical solutions in the various embodiments of the present application can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the scope of protection of this application.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A semiconductor laser driving circuit, characterized in that: It includes a host computer, a controller internal module, a constant current drive circuit and a constant temperature drive circuit; The host computer is connected to the internal module of the controller, the internal module of the controller is respectively connected to the constant current drive circuit and the constant temperature drive circuit, and the constant current drive circuit and the constant temperature drive circuit are both connected to the semiconductor laser; The internal module of the controller includes a fault detection and identification module, which is connected to the constant current drive circuit, the constant temperature drive circuit and the host computer respectively, and is used to monitor the constant current drive circuit and the constant temperature drive circuit in real time, and feed back and present the monitoring information to the host computer.

2. The circuit according to claim 1, characterized in that The internal module of the controller also includes an addressing and encoding module, which is connected to the host computer and is used to encode the instructions and data corresponding to the current parameter information set by the host computer, generate first data information and first address information, and is also used to encode the instructions and data corresponding to the temperature parameter information set by the host computer, generate second data information and second address information.

3. The circuit according to claim 2, characterized in that The internal module of the controller also includes a PWM module, which is connected to the addressing and encoding module and the constant current drive circuit respectively, and is used to receive the first data information and the first address information from the addressing and encoding module, generate a PWM control signal with a specified duty cycle, and send the PWM control signal to the constant current drive circuit.

4. The circuit according to claim 3, characterized in that The constant current driving circuit is connected to the PWM module and the semiconductor laser respectively, and is used to drive the semiconductor laser to operate within the set current parameter range after receiving the PWM control signal.

5. The circuit according to claim 2, characterized in that The controller internal module also includes a PID module, which is connected to the addressing and encoding module and the constant temperature drive circuit respectively, and is used to receive the second data information and the second address information from the addressing and encoding module, generate a PID control signal, and send the PID control signal to the constant temperature drive circuit.

6. The circuit according to claim 5, characterized in that The constant temperature driving circuit is connected to the PID module and the semiconductor laser respectively, and is used to drive the semiconductor laser to work within the set temperature parameter range after receiving the PID control signal.

7. The circuit according to claim 5, characterized in that The semiconductor laser driving circuit also includes a temperature measuring circuit, which is connected to the PID module and the thermistor in the semiconductor laser respectively, and is used to detect the temperature of the semiconductor laser and send it to the PID module.

8. The circuit according to claim 7, characterized in that The PID module is also used to obtain the temperature signal of the semiconductor laser in real time through the temperature measurement circuit to perform closed-loop control on the constant temperature drive circuit.

9. The circuit according to claim 1, characterized in that The constant temperature driving circuit is connected to the TEC in the semiconductor laser and is used to control the current passing through the TEC to adjust the temperature of the semiconductor laser.

10. A semiconductor laser driving method, characterized in that: The method is applied to the circuit according to any one of claims 1 to 9, and the method comprises: The current parameters and temperature parameters of the semiconductor laser are set by the host computer, and the corresponding instructions and data are transmitted to the internal module of the controller; The internal module of the controller encodes and processes the instructions and data corresponding to the received current parameter information and the temperature parameter information, and finally generates a control signal, and transmits it to the constant current drive circuit and the constant temperature drive circuit; The constant current driving circuit and the constant temperature driving circuit receive the control signal and drive the semiconductor laser to operate within the preset current parameter range and the preset temperature parameter range; The fault detection and identification module monitors the output current and working status information of the constant current drive circuit and the constant temperature drive circuit in real time, and feeds back the monitoring information to the host computer.

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