Control system of multi-temporal laser

Abstract

This invention provides a timing control system for a multi-temporal laser, relating to the field of laser control. The multi-temporal laser includes multiple laser loads spaced apart. The timing control system includes: multiple constant current driving devices, each connected to a laser load for supplying power; and a pre-start device connected to each constant current driving device for controlling the on / off state of each device. The pre-start module includes a conventional timing control module, which sequentially sends start commands to each constant current driving device to turn them on in a first order and sequentially sends stop commands to turn them off in a second order. This timing control system provides more reliable timing control.

Description

Technical Field

[0001] This invention relates to the field of laser control, and more particularly to a control system for a multi-temporal laser. Background Technology

[0002] Multiple laser loads are spaced apart to form a laser load array. Each laser load array needs to be turned on or off in a specific sequence to form a spatiotemporal laser. Incorrect or random activation or deactivation of multiple outputs by individual laser load arrays in a spatiotemporal laser can cause equipment damage or personal injury. Therefore, highly reliable timing control is required for spatiotemporal lasers. Currently, manual control of the activation and deactivation of each laser load in spatiotemporal lasers results in insufficient reliability in timing control. Summary of the Invention

[0003] This invention provides a timing control system for a multi-temporal laser, which addresses the technical problem of improving the reliability of timing control for multi-temporal lasers.

[0004] This invention provides a timing control system for a multi-temporal laser, the multi-temporal laser comprising multiple laser loads spaced apart. The timing control system includes: multiple constant current driving devices, each constant current driving device being connected to one of the laser loads for supplying power to the laser load; and a pre-start device connected to each constant current driving device for controlling the opening and closing of each constant current driving device. The pre-start module includes a conventional timing control module, which sequentially sends start commands to each constant current driving device to enable the constant current driving devices to turn on in a first order, and also sequentially sends stop commands to each constant current driving device to disable the constant current driving devices in a second order.

[0005] In some embodiments, when the pre-start device receives a stop command or a fault command, the conventional timing control module stops outputting the start command or the shutdown command; wherein, the pre-start device further includes a fault timing control module, which, when the pre-start device receives a stop command or a fault command, is used to sequentially send emergency shutdown commands to at least a portion of the constant current drive devices, so that each of the constant current drive devices shuts down sequentially in a second order.

[0006] In some embodiments, the fault timing control module is used to send an emergency shutdown command to each of the constant current drive devices, so that each of the constant current drive devices shuts down sequentially in the second order.

[0007] In some embodiments, the timing control system further includes a communication bus connected to each of the constant current drive devices and to the pre-start device. The communication bus is used to send the stop command or fault command to the pre-start device and the first-shutdown drive device. The first-shutdown drive device is the first constant current drive device to shut down when the constant current drive devices shut down in a second order. The first-shutdown drive device includes a drive control module, which is used to control the first-shutdown drive device to shut down when it receives the stop command or the fault command. When the pre-start device receives the stop command or the fault command, it sends an emergency shutdown command to the remaining constant current drive devices in sequence, so that the remaining constant current drive devices shut down in the second order after the first-shutdown drive device shuts down.

[0008] In some embodiments, each of the constant current driving devices includes a drive control module, which is used to acquire the actual operating state of each of the constant current driving devices; wherein, the timing control system further includes a communication bus, which is connected to each of the drive control modules to acquire the actual operating state of each of the constant current driving devices.

[0009] In some embodiments, each of the drive control modules is further configured to determine the target operating state of the constant current drive device according to the received start command or the stop command. The drive control module is further configured to compare the actual operating state with the target operating state after a preset time after receiving the start command or the stop command, and send a fault command to the pre-start device and each of the constant current drive devices through the communication bus when the actual operating state does not match the target operating state.

[0010] In some embodiments, each of the constant current driving devices is further configured to send its actual operating status to the other constant current driving devices via the communication bus; the drive control module is further configured to determine whether the start command conforms to the first order based on the actual operating status of the other constant current driving devices and the received start command; if it conforms, the constant current driving device is started in response to the start command; otherwise, the start command is not responded to. The drive control module is further configured to determine whether the stop command conforms to the second order based on the actual operating status of the other constant current driving devices and the received stop command; if it conforms, the constant current driving device is stopped in response to the stop command; otherwise, the stop command is not responded to.

[0011] In some embodiments, each of the drive control modules is further configured to send a status query instruction to other drive control modules. In response to the status query instruction, the drive control module outputs the actual operating status of the constant current drive device to the drive control module that sent the status query instruction. Each of the drive control modules is further configured to send a fault instruction to the pre-start device and each of the constant current drive devices via the communication bus when the duration for which the actual operating status is not received after the drive control module sends the status query instruction exceeds a duration threshold.

[0012] In some embodiments, each of the drive control modules is further configured to send a status query command to other power modules, and the drive control module, in response to the status query command, sends the actual operating status to the other drive control modules; each of the drive control modules is further configured to send the status query command again if it does not receive the actual operating status after the drive control module sends the status query command, and if the number of times the status query command is sent exceeds a threshold and the actual operating status is still not received, send a fault command to the pre-start device and each of the constant current drive devices through the communication bus.

[0013] In some embodiments, the constant current drive device further includes a power failure protection module, used to transmit unexpected power failure information to the fault timing control module via the communication bus when an external power supply is abnormal. This causes the fault timing control module to sequentially send emergency shutdown commands to at least a portion of the constant current drive devices, so that each constant current drive device shuts down sequentially in a second order. This invention provides a timing control system for a multi-space-time laser. The multi-space-time laser includes multiple laser loads. The timing control system includes: constant current drive devices connected to each laser load to provide power to each laser load; and a pre-start device, connected to each constant current drive device and used to control the opening and closing of each constant current drive device. When a constant current drive device is in the open state, the laser load connected to it is in the open state; when a constant current drive device is in the closed state, the laser load connected to it is in the closed state. The pre-start device includes a conventional timing control module, which is used when the timing control system and the multi-space-time laser are operating normally. In this state, start or stop commands are sent sequentially to each constant current drive device, so that each constant current drive device is turned on in a first order or turned off in a second order, thereby turning on each laser load in a first order or turning off in a second order. That is, the timing control of the turn-on or turn-off of each laser load is realized. Compared with the timing control of each laser load by manually controlling the timing, the timing control achieved by the command sent by the pre-start device can make the timing control more reliable. Moreover, the turn-on and turn-off of each constant current drive device are controlled by the start or stop commands issued sequentially by the pre-start device. The control commands have the same time base, thereby further improving the reliability of the timing control. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a timing control system for a first type of multi-temporal laser provided in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of a timing control system for a second type of multi-temporal laser provided in an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of a timing control system for a third type of multi-temporal laser provided in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of a timing control system for a fourth type of multi-temporal laser provided in an embodiment of the present invention;

[0018] Figure 5 A schematic diagram of a constant current driving device in a timing control system for a multi-temporal laser provided in an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of a pre-start device in a timing control system for a multi-temporal laser provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures

[0021] 10. Constant current drive device; 10A. First constant current drive device; 10B. Second constant current drive device; 10C. Third constant current drive device; 10D. Fourth constant current drive device; 10E. Fifth constant current drive device; 11. Drive control module; 12. Input filtering module; 13. Isolation voltage regulation module; 14. Current stabilization and regulation module; 15. Fast start and fast stop module; 16. Input interface; 17. Communication processing module; 18. Power failure protection module; 20. Pre-start module; 21. Conventional timing control module; 22. Fault timing control module; 23. Pre-start filtering module; 24. Command input interface; 25. Command output interface; 26. Pre-start communication processing module; 27. Pre-start power failure protection module; 30. Communication bus. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The specific technical features described in the various embodiments in the detailed implementation can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this invention will not be described separately.

[0024] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0025] Additionally, it should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate any similarity or connection between them. It should be understood that the directional descriptions such as "above," "below," "inside," and "outside" refer to the orientation under normal use conditions.

[0026] In the following specific embodiments, a multi-temporal laser is a laser array or matrix composed of multiple laser loads (lasers connected in series and parallel) with strict timing requirements. This laser array or matrix is ​​installed in different locations in space and has strict start-up and shutdown timing requirements in time. Incorrect power-on timing and incorrect power-off timing can lead to a large number of laser damages. Due to the strict timing requirements, it is necessary to strictly control the timing of the laser array or matrix through a timing control system. The structure and function of the timing control system are illustrated below with reference to the embodiments.

[0027] The structure and function of the timing control system are illustrated below with reference to examples and embodiments.

[0028] In some embodiments, such as Figure 1 As shown, the timing control system includes multiple constant current drive devices 10 and a pre-start device 20. Each constant current drive device 10 is connected to a laser load. The constant current drive device 10 is used to provide electrical energy to the laser load. The laser load is turned on when the constant current drive device 10 is in the on state, and the laser load is turned off when the constant current drive device 10 is in the off state. The timing control of the on and off of the constant current drive device 10 can realize the timing control of the on and off of each laser load. Optionally, the constant current drive device 10 can be a power supply device with its own power supply, so that it can directly provide electrical energy to the laser load. Optionally, the constant current drive device 10 can also supply power to the laser load through an external power supply. That is, the constant current drive device 10 is used to obtain electrical energy from the outside, convert the electrical energy into a specific form of electrical energy, and transmit the specific form of electrical energy to the laser load. For example, the constant current drive device 10 is used to regulate the voltage of the external high voltage AC power, convert the AC power into DC power, and transmit the DC power to the laser load.

[0029] The pre-start device 20 is connected to each constant current drive device 10 and is used to control the opening and closing of each constant current drive device 20. The pre-start device 20 includes a conventional timing control module 21, which is used to send start commands to each constant current drive device in sequence so that each constant current drive device is turned on in a first order. The conventional timing control module 21 is also used to send stop commands to each constant current drive device in sequence so that each constant current drive device is turned on in a second order. It can be understood that when the timing control system is in normal working condition, the pre-start device 20 sends start commands or stop commands to each constant current drive device 10 to control the opening or closing state of each constant current drive device 10. By controlling the order in which the pre-start device 20 sends start commands or stop commands to each constant current drive device 10, the order in which each constant current drive device 10 is turned on or off can be controlled, so that each constant current drive device 10 is turned on in the first order or turned off in the second order. Compared to manually controlling the timing of the on / off of each laser load, the timing of the on / off of each constant current drive device 10 is controlled by setting a pre-start device 20, thereby controlling the timing of the on / off of each laser load. This makes the timing control of the on / off of each laser load more reliable. Moreover, the on / off of each constant current drive device 10 is controlled by the start command or stop command issued sequentially by the pre-start device 20. The control commands have the same time base, which further improves the reliability of the timing control.

[0030] It should be noted that the first order and the second order can be the same or different. Optionally, the first order and the second order can be reversed. The following example uses five constant current drive devices 10, each named as the first constant current drive device 10A, the second constant current drive device 10B, the third constant current drive device 10C, the fourth constant current drive device 10D, and the fifth constant current drive device 10E, to illustrate the first order and the second order. The first order is from the first constant current drive device 10A to the fifth constant current drive device 10E, and the second order is from the fifth constant current drive device 10E to the first constant current drive device 10A.

[0031] It should also be noted that the constant current drive device 10 and the pre-start device 20 can be physical devices or virtual modules in the control system.

[0032] This invention provides a timing control system for a multi-spatial-temporal laser. The multi-spatial-temporal laser includes multiple laser loads. The timing control system includes: constant current driving devices connected to each laser load to provide power to each laser load; and a pre-start device connected to each constant current driving device and used to control the on and off states of each constant current driving device. When a constant current driving device is on, the connected laser load is on; when a constant current driving device is off, the connected laser load is off. The pre-start device includes a conventional timing control module, which is used to ensure the timing control system and the multi-spatial-temporal laser are operating normally. In this state, start or stop commands are sent sequentially to each constant current drive device, so that each constant current drive device is turned on in a first order or turned off in a second order, thereby turning on each laser load in a first order or turning off in a second order. That is, the timing control of the turn-on or turn-off of each laser load is realized. Compared with the timing control of each laser load by manually controlling the timing, the timing control achieved by the command sent by the pre-start device can make the timing control more reliable. Moreover, the turn-on and turn-off of each constant current drive device are controlled by the start or stop commands issued sequentially by the pre-start device. The control commands have the same time base, thereby further improving the reliability of the timing control.

[0033] In some embodiments, such as Figure 2 As shown, the pre-start device 20 also includes a fault timing control module 22. When the pre-start device 20 receives a stop command or a fault command, the conventional timing control module 21 stops outputting start or stop commands, and the fault timing control module 22 sequentially sends emergency stop commands to at least some of the constant current drive devices 10, so that each constant current drive device 10 shuts down sequentially in a second order. This can be understood as follows: when it is necessary to stop the entire multi-temporal laser device from operation, or when a fault is detected in the multi-temporal laser device or a fault occurs in the timing control system, the timing control system immediately leaves the conventional timing control state and enters the fault stop process. At this time, Figure 1The conventional timing control module 21 stops operating, and the fault timing control module 22 takes over the timing control. Through the stop commands sent sequentially by the fault timing control module 22 in the second order, each constant current drive device 10 is shut down sequentially in the second order. That is, the current action phase is forcibly interrupted, and each constant current drive device 10 is shut down sequentially in the second order. This ensures that even in scenarios requiring overall shutdown or detecting a fault, each laser load can be reliably shut down in the second order. Optionally, each constant current drive device 10 responds to the emergency shutdown command to stop, thus ensuring that the emergency stops of each constant current drive device 10 have the same time reference. Optionally, some constant current drive devices 10 can directly respond to the fault command to stop urgently, while the remaining constant current drive devices 10 still respond to the emergency shutdown command to stop urgently. This allows the multi-temporal laser to respond to stop commands or fault commands more quickly, enabling each laser load to shut down sequentially in the second order more rapidly.

[0034] The following is an illustrative description of the process of forcibly shutting down each constant current drive device 10 in the second order. When the first constant current drive device 10A to the fourth constant current drive device 10D are all in the on state and the fifth constant current drive device 10E is in the off state, the pre-start device 20 receives a fault command, the conventional timing control module 21 stops running, and the fault timing control module 22 sends emergency shutdown commands to the fifth constant current drive device 10E to the first constant current drive device 10A in sequence. When the fifth constant current drive device 10E receives the emergency shutdown command, it remains in the off state, and the fourth constant current drive device 10D to the first constant current drive device 10A shut down in the order in which the emergency shutdown commands are received.

[0035] The fault command can be an external input of the timing control system. For example, when a fault is detected in the multi-temporal laser, the multi-temporal laser will output a fault command. The fault command can also be sent by the timing control system. For example, when the timing control system determines that it has a fault through self-test, it will broadcast the fault command globally so that the fault command is sent to the pre-start device and each constant current drive device.

[0036] In some embodiments, such as Figure 2 As shown, the fault timing control module 22 is used to send emergency shutdown commands to each constant current drive device. Each constant current drive device 20 shuts down sequentially according to the order of the received emergency shutdown commands, so that each laser load can shut down sequentially in the second order. Moreover, since each emergency shutdown command is issued by the fault timing control module 22, the sending of each emergency shutdown command has the same time base, thus making the timing control under fault conditions more reliable.

[0037] In some embodiments, such as Figure 3As shown, the timing control system also includes a communication bus 30, which is connected to each constant current drive device 10 and the pre-start device 20. The communication bus 30 is used to send stop commands or fault commands to the pre-start and first-shutdown drive devices. The first-shutdown drive device is the first constant current drive device 10 to be shut down when each constant current drive device 10 is shut down in a second order. For example, if the fifth constant current drive device 10E is the first constant current drive device to be shut down in the second order, then the fifth constant current drive device 10E is the first-shutdown drive device. It can be understood that by setting the communication bus 30, the stop command is sent to the first-shutdown drive device. The fault command can be directly sent to the constant current drive device 10; at the same time, the first-shutdown drive device includes a drive control module 11, which is used to control the first-shutdown drive device to shut down when a shutdown command or fault command is received. After the first-shutdown drive device shuts down, the pre-start device 20 sends an emergency shutdown command to the remaining constant current drive devices 10 so that the remaining constant current drive devices 10 shut down in the second order after the first-shutdown drive device shuts down, thereby enabling the constant current drive devices 10 to respond to the stop command or fault command more quickly and shut down each laser load in the second order more quickly.

[0038] In some embodiments, such as Figure 3 As shown, each constant current drive device 10 includes a drive control module 11. The drive control module 11 is used to acquire the actual working state of each constant current drive device 10. Simultaneously, the timing control system also includes a communication bus 30, which is connected to each drive control module to acquire the actual working state of the constant current drive device 10. It can be understood that the constant current drive device 10 includes a high-voltage section and a low-voltage section. The high-voltage section acquires external high-voltage electrical energy and converts it into DC current that conforms to the voltage of the laser load, then transmits the electrical energy to each laser load. The drive control module 11 acquires the voltage of the high-voltage section through low-voltage sampling and... The high voltage is proportionally converted into a low voltage that the electronic control circuit can withstand. The level of this low voltage can change with the level of the high voltage in the high voltage section. The drive control module 11 can determine the actual working state of the constant current drive device 10 through the level of this low voltage. Moreover, the drive control module 11 can also send the actual working state through the communication bus 30, which allows each drive control module 11 to perform mutual checks based on the actual working state of the other constant current drive devices 10 to realize fault self-check of the timing control system, or send the actual working state to an external control device to monitor the working state of each constant current drive device 10.

[0039] The following is combined Figure 4The structure of the high-voltage and low-voltage sections of the constant current drive device 10 is illustrated by way of example. The high-voltage section of the constant current drive device 10 includes an input filter module 12, an isolation voltage regulation module 13, a current stabilization module 14, and a fast start / stop module 15. The externally input high-voltage electricity flows sequentially through the input filter module 12, the isolation voltage regulation module 13, the current stabilization module 14, and the fast start / stop module 15 before being transmitted to the laser load. The input filter module 11 is used to suppress operational surges caused by external switching actions or conducted interference on the same busbar, improving the anti-interference performance and electromagnetic compatibility of each constant current drive device 10. The isolation voltage regulation module 13 is used for high-voltage isolation and pre-voltage regulation. Specifically, in high-power applications, due to the high voltage of the high-voltage DC input voltage, to protect... The laser load requires isolation using a high-frequency transformer. The isolation voltage regulation module 13 can regulate the voltage according to a fixed ratio, making the output voltage of the isolation voltage regulation module 13 close to the required output voltage of the current regulation module 14, thereby reducing the working pressure of the current regulation module 14. The current regulation module 14 is used to achieve stable, low-ripple current output and adjustment, and it can also dynamically adjust the output current according to the current setting value. The fast start-up and fast shutdown module 15 can quickly start the laser load to reach the output current setting value and suppress current and voltage overshoot. The fast start-up and fast shutdown module 15 can also quickly shut down the output to ensure timely and reliable shutdown in the event of abnormal power failure, and ensure that there is no voltage or current oscillation during the shutdown process of the laser load. The low-voltage section of the constant current drive device 10 includes a drive control module 11, an input interface 16, and a communication processing module 17. The input interface 16 is used to receive start-up commands, stop commands, and emergency stop commands from the pre-start module 10 and transmit each command to the drive control module 11. The drive control module 11 is used to control the working state of the high-voltage section in response to each command, thereby switching the constant current drive device 10 between the start-up and stop-down states. The drive control module 11 is also used to perform low-voltage sampling from the high-voltage section to obtain the actual working state of the drive control device 10 and transmit the actual working state to the communication processing module 17. The communication processing module 17 is used to encode the actual working state according to the communication protocol and send it to the other constant current drive devices 10. It can be understood that the communication processing module 17 of each constant current drive device 10 has a different address, and bidirectional signal transmission between the constant current drive devices 10 can be realized through the communication protocol.

[0040] In some other embodiments, the pre-start device 20 also includes a high-voltage section and a low-voltage section, which are described below in conjunction with... Figure 4 The structure of the pre-start device 20 is described exemplarily. The high-voltage section includes a pre-start filter module 23, through which external high-voltage electricity supplies power to the pre-start device 20. The function of the pre-start filter module 23 is the same as that of the input filter module 11. The low-voltage section includes a conventional timing control module 21. Figure 4 The system comprises a fault timing control module 22 (not shown), an instruction input interface 24, an instruction output interface 25, and a pre-start communication processing module 26. The instruction input interface 24 receives external stop or fault instructions and transmits them to the fault timing control module 22. The fault timing control module 22 outputs an emergency shutdown instruction based on the received stop or fault instruction. Multiple instruction output interfaces 25 are connected to a constant current drive device 10, and each instruction output interface 25 sequentially sends a start instruction, a shutdown instruction, or an emergency shutdown instruction to the respective constant current drive device 10. The pre-start communication processing module 26... The pre-start device 20 is connected to the communication processing module 26 of each constant current drive device 10 via the communication bus 30, thereby enabling bidirectional signal transmission between the pre-start device 20 and each constant current drive device 10. For example, while the conventional timing control module 21 sends a start command to a constant current drive device 10 through the command output interface 25, it also sends a start command to the same constant current drive device 10 through the pre-start communication processing module 26. The drive control module 11 of the constant current drive device 10 compares the command obtained by the input interface 16 and the command obtained by the communication processing module 17. If the two commands are the same, the module responds to the command; if they are different, the module does not respond to the command, so as to prevent the control command from being transmitted incorrectly.

[0041] In some embodiments, such as Figure 4 As shown, each drive control module 11 is also used to determine the target operating state of the constant current drive device according to the received start command or stop command. That is, after receiving the start command, the target operating state is determined to be the on state, and after receiving the stop command, the target operating state is determined to be the off state. The drive control module 11 is also used to compare the actual operating state of the constant current drive device 10 with the target operating state after a preset time after receiving the start command or stop command. When the actual operating state does not match the target operating state, a fault command is sent to the pre-start device 20 and each constant current drive device 10 through the communication bus 30. It can be understood that by obtaining its own actual operating state, it can perform a self-check of its own operating state after receiving the control command. When the constant current drive device 10 cannot respond to the control command to make its own actual operating state match the target operating state, it is considered that the constant current drive device 10 has a fault. At this time, the fault command is broadcast globally through the control bus 30 so that the timing control system enters the fault emergency stop process from the normal operating state.

[0042] In some embodiments, such as Figure 4As shown, each constant current drive device 10 is also used to send its actual operating status to other constant current drive devices 10 via the communication bus 30. This can be understood as each constant current drive device 10 sharing the actual operating status of all constant current drive devices 10 via the communication bus. Simultaneously, the drive control module 11 is also used to determine whether the start command conforms to the first order based on the actual operating status of the other constant current drive devices and the received start command. If it conforms, the constant current drive device 10 is started in response to the start command; otherwise, the start command is not responded to. This can be understood as each constant current drive device 10, based on sharing its actual operating status, being able to process the received start command. Based on rational judgment, if responding to the start command would cause the laser load's start sequence to deviate from the first order, then the control command will not be responded to. For example, after the third constant current drive device 10C receives the start command, if both the second constant current drive device 10B and the first constant current drive device 10A are already in the start state, then the start command is considered reasonable, and the third constant current drive device 10C is started in response to the start command. If either the second constant current drive device 10B or the first constant current drive device 10A is in the stop state, then the start command is determined to be unreasonable, and the start command is refused, keeping the third constant current drive device 10C in the stop state.

[0043] Furthermore, the drive control module 11 is also used to determine whether the shutdown command conforms to the second order based on the actual working state of the other constant current drive devices and the received shutdown command. If it conforms, the constant current drive device is shut down in response to the shutdown command; if it does not conform, the shutdown command is not responded to. It can be understood that each constant current drive device 10, based on the shared actual working state, can make a reasonable judgment on the received shutdown command. If responding to the shutdown command would cause the laser load to not meet the second order, the control command is not responded to.

[0044] In some embodiments, such as Figure 4As shown, each drive control module 11 is also used to send a status query command to the drive control modules 11 of other constant current drive devices 10. In response to the query command, each of the other drive control modules outputs the actual operating status of its own constant current drive device 10 to the drive control module 11 that sent the query command. This can be understood as each drive control module 11 obtaining the actual operating status of the remaining constant current drive devices 10 by sending status query commands to them. To prevent the actual operating status of each constant current drive device 10 from being unshared due to signal transmission failures, it is necessary to monitor the output status of the actual operating status. When a fault occurs in the sending or receiving of signals, it is confirmed that there is a fault in the signal transmission of the timing control system. The fault in signal transmission will cause the self-test function of each constant current drive device 10 and the function of judging the rationality of control commands to fail, resulting in a decrease in the reliability of timing control. Therefore, it is also necessary to broadcast the fault command globally so that the timing control system can enter the fault stop workflow from the normal working state. Two signal transmission fault monitoring methods are provided below. The timing control system can use either of the following two monitoring methods, or both of the following monitoring methods can be used simultaneously. When a signal transmission fault is confirmed by either of the following two monitoring methods, the fault command will be broadcast globally.

[0045] The first signal transmission fault monitoring method is that the drive control module 11 is also used to start timing after sending the status query command. If the duration of not receiving the actual working status after sending the status query command exceeds the duration threshold, a signal transmission fault is determined to exist. The second signal transmission fault monitoring method is that the drive control module 11 is also used to start timing after sending the status query command. If the duration of not receiving the actual working status exceeds the waiting time, the status query command is sent again. If the number of times the status query command is sent exceeds the number threshold and no actual working status is still received, a signal transmission fault is determined to exist.

[0046] Optionally, the two signal transmission fault monitoring methods described above can be combined. That is, the drive control module 11 is also used to start timing after sending the status query command. If the duration of not receiving the actual working status exceeds the waiting time, the status query command is sent again. If the number of times the status query command is sent exceeds the number threshold and the actual working status is still not received, or if the total duration of not receiving the actual working status exceeds the duration threshold, a signal transmission fault is determined to exist.

[0047] In some embodiments, such as Figure 5As shown, the constant current drive device 10 also includes a power failure protection module 18, which is used to monitor the status of the external power supply. When an abnormality in the external power supply is detected, the unexpected power failure information is transmitted to the fault timing control module 22 through the communication bus 30, so that the fault timing control module 22 sends an emergency shutdown command to at least some of the constant current drive devices 10 in sequence, so that each constant current drive device 10 shuts down in the second order.

[0048] In some other embodiments, such as Figure 6 As shown, the pre-start device 20 also includes a pre-start power failure protection module 27, which transmits the unexpected power failure information to the fault timing control module 22 when an abnormal external power supply is detected in the pre-start device 20, so that the fault timing control module 22 sends emergency shutdown commands to at least some of the constant current drive devices 10 in sequence, so that each constant current drive device 10 shuts down in a second order.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A timing control system for a multi-temporal laser, characterized in that, The multi-temporal laser includes multiple laser loads spaced apart, and the timing control system includes: Multiple constant current driving devices are provided, each of which is connected to one of the laser loads to supply power to the laser loads. A pre-start device, connected to each of the constant current drive devices, is used to control the opening and closing of each of the constant current drive devices; The pre-start device includes a conventional timing control module, which is used to send start commands to each of the constant current drive devices in sequence so that each of the constant current drive devices is turned on in a first order. The conventional timing control module is also used to send stop commands to each of the constant current drive devices in sequence so that each of the constant current drive devices is turned off in a second order. When the pre-start device receives a stop command or a fault command, the conventional timing control module stops outputting the start command or the shutdown command; The pre-start device further includes a fault timing control module. When the pre-start device receives a stop command or a fault command, the fault timing control module is used to send emergency shutdown commands to at least some of the constant current drive devices in sequence, so that each constant current drive device is shut down in a second order.

2. The timing control system according to claim 1, characterized in that, The fault timing control module is used to send an emergency shutdown command to each of the constant current drive devices, so that each of the constant current drive devices shuts down sequentially in the second order.

3. The timing control system according to claim 1, characterized in that, The timing control system further includes a communication bus, which is connected to each of the constant current drive devices and to the pre-start device. The communication bus is used to send the stop command or fault command to the pre-start device and the first-shutdown drive device. The first-shutdown drive device is the first constant current drive device to be shut down when each of the constant current drive devices is shut down in the second order. The first-stage drive device includes a drive control module, which is used to control the first-stage drive device to shut down when it receives the stop command or the fault command. When the pre-start device receives the stop command or the fault command, it sends an emergency shutdown command to the remaining constant current drive devices in sequence, so that the remaining constant current drive devices shut down in the second order after the first-stage drive device shuts down.

4. The timing control system according to any one of claims 1 to 3, characterized in that, Each of the constant current driving devices includes a drive control module, which is used to acquire the actual working state of each of the constant current driving devices; The timing control system further includes a communication bus, which is connected to each of the drive control modules to obtain the actual working status of each constant current drive device.

5. The timing control system according to claim 4, characterized in that, Each of the drive control modules is further configured to determine the target operating state of the constant current drive device according to the received start command or the stop command. The drive control module is further configured to compare the actual operating state with the target operating state after a preset time after receiving the start command or the stop command. If the actual operating state does not match the target operating state, the drive control module sends a fault command to the pre-start device and each of the constant current drive devices through the communication bus.

6. The timing control system according to claim 4, characterized in that, Each of the constant current driving devices is also used to send its actual operating status to the other constant current driving devices through the communication bus; The drive control module is also used to determine whether the start command conforms to the first order based on the actual working state of the other constant current drive devices and the received start command. If it conforms, the constant current drive device is started in response to the start command; if it does not conform, the start command is not responded to. The drive control module is also used to determine whether the shutdown command conforms to the second order based on the actual working state of the other constant current drive devices and the received shutdown command. If it conforms, the constant current drive device is shut down in response to the shutdown command; otherwise, the shutdown command is not responded to.

7. The timing control system according to claim 6, characterized in that, Each of the drive control modules is also used to send a status query command to other drive control modules. In response to the status query command, the drive control module outputs the actual working status of the constant current drive device to the drive control module that sent the status query command. Each of the drive control modules is further configured to send a fault command to the pre-start device and each of the constant current drive devices via the communication bus when the duration for which the actual working status is not received after the drive control module sends the status query command exceeds a duration threshold.

8. The timing control system according to claim 6, characterized in that, Each of the drive control modules is further configured to send a status query command to other power modules, and the drive control module, in response to the status query command, sends the actual working status to the other drive control modules; Each of the drive control modules is further configured to send the status query instruction again if the actual working status is not received after the drive control module sends the status query instruction, and to send a fault instruction to the pre-start device and each of the constant current drive devices through the communication bus if the number of times the status query instruction is sent exceeds the number threshold and the actual working status is still not received.

9. The timing control system according to claim 4, characterized in that, The constant current drive device also includes a power failure protection module, which is used to transmit unexpected power failure information to the fault timing control module through the communication bus when the external power supply is abnormal, so that the fault timing control module sends emergency shutdown commands to at least some of the constant current drive devices in sequence, so that each constant current drive device shuts down in a second order.

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