CN113572019B - Laser light emitting control system and method, quasi-continuous laser - Google Patents
Laser light emitting control system and method, quasi-continuous laser Download PDFInfo
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- CN113572019B CN113572019B CN202110752511.9A CN202110752511A CN113572019B CN 113572019 B CN113572019 B CN 113572019B CN 202110752511 A CN202110752511 A CN 202110752511A CN 113572019 B CN113572019 B CN 113572019B
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Abstract
The invention relates to a laser light-emitting control system and method, in particular to a quasi-continuous laser. The system comprises: the controlled end of the first switch is used for acquiring a switching signal, and the input end of the first switch is used for acquiring a power signal; the output end of the control module is used for outputting a comparison signal, the first input end of the control module is connected with the output end of the first switch, and the second input end of the control module is used for acquiring a switch signal; and the controlled end of the second switch is connected with the output end of the control module, the disconnection and the connection of the second switch are controlled by the comparison signal, the input end of the second switch is connected with the output end of the first switch, and the output end of the second switch is used for outputting a power signal to the driving module. The amplitude of the first signal is adjusted in real time according to the on-state duration of the switching signal, the longer the on-state duration is, the smaller the amplitude of the first signal is, and the laser light-emitting device is enabled to pause to emit light when the power signal is larger than the amplitude of the first signal, so that the reliability of overshoot protection is improved.
Description
Technical Field
The invention relates to a laser, in particular to a laser light-emitting control system, a laser light-emitting control method and a quasi-continuous laser.
Background
A quasi-continuous laser (QCW laser) is a laser developed on the basis of a continuous laser (CW laser). The QCW laser doubles and improves the peak power output by the CW laser through a pulse overshoot method, and low-cost and high-performance output is realized.
In the pulse overshoot mode, a Laser Diode (LD) inside the QCW laser needs to intermittently switch an optical signal (i.e., a pulse mode is used) to ensure that the junction temperature of the LD is not accumulated too high to burn out the LD chip.
Disclosure of Invention
Based on this, it is necessary to provide a laser light emission control system.
A laser emission control system comprising: the laser light emitting device comprises a first switch and a second switch, wherein the first switch comprises an input end, an output end and a controlled end, the controlled end is used for obtaining a switch signal, the switch signal is a pulse signal, the first switch is closed when the switch signal is at a first level, the first switch is opened when the switch signal is at a second level, the input end is used for obtaining a power signal, and the amplitude of the power signal is positively correlated with the light emitting power of the laser light emitting device; the control module comprises a first input end, a second input end and an output end, the output end of the control module is used for outputting a comparison signal, the first input end is connected with the output end of the first switch, and the second input end is used for acquiring the switch signal; the controlled end of the second switch is connected with the output end of the control module, the comparison signal controls the second switch to be opened and closed, the input end of the second switch is connected with the output end of the first switch, and the output end of the second switch is used for outputting the power signal to the driving module, so that the driving module drives the laser light-emitting device to emit light according to the power signal; the control module is used for outputting a comparison signal for controlling the second switch to be closed when the amplitude of the power signal is smaller than the amplitude of a first signal, and outputting a comparison signal for controlling the second switch to be opened when the amplitude of the power signal is larger than the amplitude of a first signal, wherein the amplitude of the first signal is reduced along with the increase of the duration of the first level of the switch signal, and is increased along with the increase of the duration of the second level of the switch signal.
According to the laser light-emitting control system, the control module adjusts the amplitude of the first signal in real time according to the on-state (namely, first level) duration of the switching signal, the longer the on-state duration is, the smaller the first signal amplitude is, the laser light-emitting device is enabled to pause to emit light when the power signal is larger than the amplitude of the first signal, and the power signal is output to the driving module to drive the laser light-emitting device to emit light when the power signal is smaller than the amplitude of the first signal and the switching signal is in the on-state, so that the laser light-emitting device is prevented from being heated and damaged when the laser emits light in a pulse overshoot mode. The judgment logic of the laser light-emitting control system is simple, the whole control logic is clear, the realization of the whole control logic through simple hardware is easy, the circuit cost is favorably reduced, and the reliability of overshoot protection is improved.
In one embodiment, the control module is configured to add one to a count value per unit time duration of the first level of the switching signal, subtract one from the count value per unit time duration of the second level of the switching signal, and divide the first value by the count value to obtain a current amplitude of the first signal.
In one embodiment, the control module includes a counting unit, a digital-to-analog conversion unit, and a comparator, the input end of the counting unit is the second input end, the input end of the digital-to-analog conversion unit is connected to the output end of the counting unit, the output end of the digital-to-analog conversion unit is connected to the second input end of the comparator, and the first input end of the comparator is the first input end of the control module.
In one embodiment, the counting unit counts up the count value for each unit time duration of the first level of the switching signal and counts down the count value for each unit time duration of the second level of the switching signal.
In one embodiment, the laser light emitting device comprises a laser diode.
In one embodiment, the counting unit comprises an FPGA.
In one embodiment, the first value is 1000, the unit time is one millisecond, the amplitude of the first signal is in percentage, and the amplitude of the first signal is 100, which is equal to the corresponding amplitude of the power signal at a current 10 times the maximum continuous output current of the laser light emitting device.
In one embodiment, the first level is a high level and the second level is a low level.
It is also necessary to provide a quasi-continuous laser, which includes a power signal generating unit, a switching signal generating unit, a laser light emitting device, and a driving module connected to the laser light emitting device, and further includes the laser light emission control system according to any of the foregoing embodiments.
It is also necessary to provide a laser light emission control method.
A laser light emission control method, comprising: acquiring a power signal and a switching signal, wherein the amplitude of the power signal is positively correlated with the luminous power of the laser luminous device, and the switching signal is a pulse signal; when the power signal and the switching signal meet a preset condition and the switching signal is at a first level, outputting the power signal to a driving module to drive the laser light-emitting device to emit light; when the power signal and the switching signal do not meet the preset condition, enabling the laser light-emitting device to pause to emit light until the next period of the switching signal; the preset condition is that the product of the duty ratio of the current pulse of the switching signal and the luminous power does not reach the first threshold value, and the product of the pulse width of the current pulse of the switching signal and the luminous power does not reach the second threshold value.
According to the light emitting control method of the laser, when the product of the duty ratio of the current pulse of the switching signal and the light emitting power reaches a first threshold value and the product of the pulse width of the current pulse of the switching signal and the light emitting power reaches a second threshold value, the laser light emitting device stops emitting light; when the product of the duty ratio and the luminous power does not reach a first threshold value and the product of the pulse width and the luminous power does not reach a second threshold value, the power signal of the switching signal in the on state is output to the driving module to drive the laser luminous device to emit light, and therefore the laser luminous device is prevented from being heated and damaged when the laser emits light in a pulse over-modulation mode.
In one embodiment, the preset condition is that the amplitude of the power signal is greater than the amplitude of the first signal; the amplitude of the first signal decreases as the duration of the first level of the switching signal increases and increases as the duration of the second level of the switching signal increases.
In one embodiment, a count value is incremented by one every unit time duration of the first level of the switching signal; decrementing the count value by one at each sustained unit time of the second level of the switching signal; and dividing a preset value by the counting value to be used as the current amplitude of the first signal.
In one embodiment, the first threshold is 1000, the second threshold is 1000, the unit of the pulse width is millisecond, the units of the light emitting power and the duty ratio are percentages, and the light emitting power corresponding to 100 of the light emitting power is 10 times the maximum continuous output current of the laser light emitting device.
In one embodiment, the upper limit value of the duty ratio is 50.
In one embodiment, the upper limit of the pulse width is 50.
In one embodiment, the upper limit value of the luminous power is 100.
In one embodiment, the first level is a high level and the second level is a low level.
In one embodiment, the preset value is 1000, and the unit time is 1 millisecond.
In one embodiment, the laser is a quasi-continuous laser.
It is also necessary to provide a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the steps in the laser emission control method of any of the above embodiments.
It is also necessary to provide a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the laser light emission control method according to any one of the foregoing embodiments when executing the computer program.
Drawings
For a better understanding of the description and/or illustration of embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the drawings. The additional details or examples used to describe the figures should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and/or examples, and the presently understood best modes of these inventions.
FIG. 1 is a flow chart of a method for controlling laser emission in one embodiment;
FIG. 2 is a block diagram of a laser emission control system in one embodiment;
FIG. 3 is a block diagram of a laser emission control system in another embodiment;
FIG. 4 is a timing diagram of the laser emission control system in an embodiment in which the duty ratio of the switching signal is low;
fig. 5 is a circuit timing diagram of a laser emission control system in an embodiment in which the duty ratio of the switching signal is high.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it can be directly on, adjacent to, connected or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
The terms "high level" and "low level" as used herein are two opposite logic levels in the electrical engineering field, the high level being generally denoted by "1" and the low level being generally denoted by "0". The digital circuits formed by different components have different logic levels corresponding to voltages. In a TTL gate circuit, a voltage greater than 3.5 volts is generally specified as a logic high level, and a voltage less than 0.3 volts is generally specified as a logic low level.
The Laser Diode (LD) is used as a pumping light source of a continuous laser (CW laser) and has the maximum continuous output current parameter of the laser diode, wherein the maximum continuous output current is determined according to the junction temperature of an LD chip, namely, the junction temperature of the LD chip is required to be prevented from exceeding a threshold value so as to avoid the heating damage of the LD chip. When the CW laser operates the LD in the continuous mode, the LD does not operate at a current exceeding the maximum continuous output current. In order to increase the peak power, a quasi-continuous laser (QCW laser) has a maximum continuous output current in a pulse mode of an internal LD that is greater than the maximum continuous output current (for example, 10 times the maximum continuous output current). The current of QCW in continuous mode is the same as the current of CW laser LD.
In order to ensure that the junction temperature of the LD is not accumulated too high to burn out the LD chip, the application provides a laser light emitting control method to ensure that the junction temperature of the LD is not over-standard. FIG. 1 is a flow chart of a method for controlling laser emission in one embodiment, comprising the steps of:
and S110, acquiring a power signal and a switching signal.
In one embodiment of the present application, the quasi-continuous laser generates a power signal by a power signal generation unit and generates a switching signal by a switching signal generation unit. The driving module of the quasi-continuous laser adjusts the luminous power of the laser light-emitting device according to the amplitude of the power signal, and the amplitude of the power signal is in positive correlation with the luminous power of the laser light-emitting device. In one embodiment of the present application, the laser emitting device is a laser diode and the switching signal is a pulse signal.
And S120, judging whether the switching signal is at the first level.
In one embodiment of the present application, when the switching signal is at the first level, step S130 is executed, otherwise, step S142 is executed.
In one embodiment of the present application, the first level is a high level.
And S130, judging whether the power signal and the switching signal meet preset conditions.
If yes, go to step S140, otherwise go to step S142.
In an embodiment of the present application, the preset condition is that the product of the duty ratio of the current pulse of the switching signal and the light emitting power does not reach the first threshold, and the product of the pulse width of the current pulse of the switching signal and the light emitting power does not reach the second threshold.
And S140, outputting the power signal to a driving module to drive the laser light-emitting device to emit light.
That is, in a state where the switching signal is at the first level, when a product of a duty ratio of a current pulse of the switching signal and the light emitting power does not reach a first threshold and a product of a pulse width of the current pulse of the switching signal and the light emitting power does not reach a second threshold, the power signal is output to the driving module to drive the laser light emitting device to emit light.
S142, the laser light emitting device suspends light emission until the next cycle of the switching signal.
When the switching signal is at a second level, the laser light-emitting device stops emitting light; when the product of the duty ratio of the current pulse of the switching signal and the luminous power reaches a first threshold value, the laser light-emitting device also stops emitting light; when the product of the pulse width of the current pulse and the luminous power of the switching signal reaches a second threshold value, the laser luminous device can also pause to emit light. In one embodiment of the present application, the second level is a low level.
According to the light-emitting control method of the laser, when the product of the duty ratio of the current pulse of the switching signal and the light-emitting power reaches a first threshold value and the product of the pulse width of the current pulse of the switching signal and the light-emitting power reaches a second threshold value, the laser light-emitting device stops emitting light; when the product of the duty ratio and the luminous power does not reach a first threshold value and the product of the pulse width and the luminous power does not reach a second threshold value, the power signal of the on-state of the switching signal is output to the driving module to drive the laser light-emitting device to emit light, and therefore when the laser emits light in a pulse overshoot mode, the laser light-emitting device is prevented from being damaged due to heating.
In one embodiment of the present application, the first threshold is 1000, the second threshold is 1000, the unit of the pulse width is millisecond, the units of the light emitting power and the duty ratio are both percentage, and the light emitting power corresponding to 100 is 10 times the maximum continuous output current of the laser light emitting device.
In one embodiment of the present application, the upper limit of the light emitting power is 100 (i.e., 100%), the upper limit of the duty ratio is 50 (i.e., 50%), and the upper limit of the pulse width is 50 (i.e., 50 ms).
In one embodiment of the present application, the junction temperature of the laser diode is guaranteed not to exceed the standard by the following constraints.
Power (1-100) multiplied by duty ratio (1-50) is less than or equal to 1000
Power (1-100) multiplied by pulse width (0.02-50) is less than or equal to 1000
In one embodiment of the present application, the preset condition is that the amplitude of the power signal is greater than the amplitude of the first signal. The first signal is a signal whose amplitude decreases as the duration of the first level of the switching signal increases and whose amplitude increases as the duration of the second level of the switching signal increases.
In one embodiment of the present application, a count value is added by one at each unit time duration of the first level of the switching signal, the count value is subtracted by one at each unit time duration of the second level of the switching signal, and a preset value is divided by the count value as a current amplitude of the first signal.
In one embodiment of the present application, the preset value is 1000, and the unit time is 1 millisecond. In one embodiment of the application, counting is continuously carried out according to the level of the switching signal, the counting value T +1 is carried out every 1 millisecond when the high level of the switching signal is continuously carried out, the counting value T-1 is carried out every 1 millisecond when the low level is continuously carried out, the amplitude of the first signal is calculated through 1000/T every counting number and is compared with the amplitude of the power signal, and when the amplitude of the power signal is smaller than the amplitude of the first signal, if the switching signal is at the high level, the power signal is output to the driving module to drive the laser light-emitting device to emit light; when the amplitude of the power signal is larger than that of the first signal, the laser light-emitting device is enabled to stop emitting light until the amplitude of the power signal is smaller than that of the first signal again.
In one embodiment of the present application, the counting according to the level of the switching signal is performed by an FPGA (Field Programmable Gate Array).
In one embodiment of the application, the comparison of the amplitude of the power signal with the amplitude of the first signal is performed by a comparator.
The application correspondingly provides a laser luminescence control system. Fig. 2 is a block diagram of a laser emission control system including a first switch 22, a second switch 24, and a control module 26 according to an embodiment. In one embodiment of the present application, the laser generates a power signal by a power signal generation unit and generates a switching signal by a switching signal generation unit. The amplitude of the power signal is positively correlated with the luminous power of the laser luminous device. The switching signal is a pulse signal. In one embodiment of the present application, the above-described laser emission control system is used to control the alignment of a continuous laser.
The controlled end of the first switch 22 is connected to the switch signal generating unit, and when the switch signal is at the first level, the first switch 22 is closed, and when the switch signal is at the second level, the first switch 22 is opened. The input of the first switch 22 is connected to the power signal generating unit.
The output of the control module 26 is used to output a comparison signal. A first input of the control module 26 is connected to an output of the first switch 22. A second input of the control module 26 is connected to the switching signal generating unit.
The controlled terminal of the second switch 24 is connected to the output terminal of the control module 26, and the comparison signal controls the second switch 24 to open and close. An input of the second switch 24 is connected to an output of the first switch 22. The output end of the second switch 24 is used for outputting a power signal to the driving module of the laser, so that the driving module drives the laser light emitting device to emit light according to the power signal. In one embodiment of the present application, the laser light emitting device is a laser diode.
Specifically, the control module 26 outputs a comparison signal that controls the second switch 24 to close when the magnitude of the power signal is less than the magnitude of the first signal, and outputs a comparison signal that controls the second switch 24 to open when the magnitude of the power signal is greater than the magnitude of the first signal. The amplitude of the first signal decreases as the duration of the first level of the switching signal increases and increases as the duration of the second level of the switching signal increases. In one embodiment of the present application, the first level is a high level and the second level is a low level. In one embodiment of the present application, the comparison signal is high when the magnitude of the power signal is less than the magnitude of the first signal, and the comparison signal is low when the magnitude of the power signal is greater than the magnitude of the first signal.
According to the laser light-emitting control system, the control module adjusts the amplitude of the first signal in real time according to the on-state (namely the first level) time of the switching signal, the longer the on-state time is, the smaller the first signal amplitude is, the laser light-emitting device is enabled to pause to emit light when the power signal is larger than the amplitude of the first signal, and the power signal is output to the driving module to drive the laser light-emitting device to emit light when the power signal is smaller than the amplitude of the first signal and the switching signal is in the on-state, so that the laser light-emitting device is prevented from being damaged due to heating when the laser emits light in a pulse overshoot mode. The judgment logic of the laser light-emitting control system is simple, the whole control logic is clear, the realization of the whole control logic through simple hardware is easy, the circuit cost is favorably reduced, and the reliability of overshoot protection is improved.
In one embodiment of the present application, the first switch 22 and the second switch 24 are both selection switches.
In one embodiment of the present application, the control module 26 is configured to increment the count value by one for each unit time duration of the first level of the switching signal, decrement the count value by one for each unit time duration of the second level of the switching signal, and divide the first value by the count value as the current amplitude of the first signal.
Referring to fig. 3, in one embodiment of the present application, the control module 26 includes a counting unit 262, a digital-to-analog conversion (DAC) unit 264, and a comparator 266. An input end of the counting unit 262 is used as the second input end of the control module 26 connected to the switch signal generating unit, an input end of the digital-to-analog converting unit 264 is connected to an output end of the counting unit 262, an output end of the digital-to-analog converting unit 264 is connected to the second input end of the comparator 266, and a first input end of the comparator 266 is used as the first input end of the control module 26 connected to the output end of the first switch 22. The control module 26 counts the level according to the switching signal by the counting unit 262. In one embodiment of the present application, the counting unit 262 is an FPGA.
The laser light-emitting control system of the embodiment shown in fig. 3 can limit and protect the laser power and duty ratio through the controlled switch, the comparator, the DAC and the FPGA. The judgment logic is simple, the whole control logic is clear, the performance requirements on the DAC and the FPGA are low, and the DAC output is controlled by the FPGA through a complex algorithm after an ADC (analog-to-digital converter) is not required to acquire a power signal to the FPGA.
In one embodiment of the present application, the counting unit 262 continuously counts according to the level of the switching signal. The high level of the switching signal is applied to the count value T +1 for every 1 ms duration, and the low level is applied to the count value T-1 for every 1 ms duration. Every time the counting unit 262 counts one count, the digital-to-analog conversion unit 264 outputs the first signal Net2=1000/T (amplitude) and compares with the amplitude of the power signal Net 1. When the amplitude of the power signal Net1 is smaller than the amplitude of the first signal Net2, the output of the comparator 266 will close the second switch 24, and if the first switch 22 is also closed, the power signal Net1 can be smoothly transmitted to the driving module, and the driving module drives the LD to emit light according to the power signal Net 1. When the magnitude of the power signal Net1 is greater than the magnitude of the first signal Net2, the output of the comparator 266 will cause the second switch 24 to turn off, and LD will not emit light. The timing diagram may refer to fig. 4 and 5. The power signal Net1 and the first signal Net2 are separated by a dash-dot line in fig. 4 and 5 for distinction. During the time period shown in fig. 4, the magnitude of the power signal Net1 is always smaller than the magnitude of the first signal Net2 (the magnitude of the power signal Net1 is H at most in fig. 4), and the second switch 24 is kept closed. In fig. 5, the duty ratio of the switching signal is large, so that the amplitude of the first signal Net2 is smaller than the amplitude H of the power signal Net1 within a period of time, at this time, the second switch 24 is turned off, even if the switching signal is at a high level, the power signal Net1 is not provided to the driving module, and LD does not emit light.
It should be understood that, although the steps in the flowcharts of the present application are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flow chart of the present application may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or the stages is not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a part of the steps or the stages in other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The present application further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps in the laser light emission control method according to any of the above embodiments.
The present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the laser light emission control method according to any one of the foregoing embodiments when executing the computer program.
In the description herein, references to "some embodiments," "other embodiments," "desired embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic depictions of the above terms do not necessarily refer to the same embodiment or example.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A laser emission control system, comprising:
the laser light emitting device comprises a first switch and a second switch, wherein the first switch comprises an input end, an output end and a controlled end, the controlled end is used for acquiring a switching signal, the switching signal is a pulse signal, the first switch is closed when the switching signal is at a first level, the first switch is opened when the switching signal is at a second level, the input end is used for acquiring a power signal, and the amplitude of the power signal is positively correlated with the light emitting power of the laser light emitting device;
the control module comprises a first input end, a second input end and an output end, wherein the output end of the control module is used for outputting a comparison signal, the first input end is connected with the output end of the first switch, and the second input end is used for acquiring the switch signal;
the controlled end of the second switch is connected with the output end of the control module, the comparison signal controls the second switch to be switched on and off, the input end of the second switch is connected with the output end of the first switch, and the output end of the second switch is used for outputting the power signal to the driving module, so that the driving module drives the laser light-emitting device to emit light according to the power signal;
the control module is used for outputting a comparison signal for controlling the second switch to be closed when the amplitude of the power signal is smaller than the amplitude of a first signal, and outputting a comparison signal for controlling the second switch to be opened when the amplitude of the power signal is larger than the amplitude of a first signal, wherein the amplitude of the first signal is reduced along with the increase of the duration of the first level of the switch signal, and is increased along with the increase of the duration of the second level of the switch signal.
2. The laser lighting control system of claim 1 wherein the control module is configured to increment a count value for each unit time duration of the first level of the switching signal, decrement the count value for each unit time duration of the second level of the switching signal, and divide the first value by the count value as the current amplitude of the first signal.
3. The laser illumination control system according to claim 2, wherein the control module comprises a counting unit, a digital-to-analog conversion unit and a comparator, an input end of the counting unit is the second input end, an input end of the digital-to-analog conversion unit is connected to an output end of the counting unit, an output end of the digital-to-analog conversion unit is connected to the second input end of the comparator, and a first input end of the comparator is the first input end of the control module.
4. The laser lighting control system of claim 1 wherein the laser light emitting device comprises a laser diode.
5. The laser lighting control system of claim 3 wherein the counting unit comprises an FPGA.
6. A quasi-continuous laser, comprising a power signal generating unit, a switching signal generating unit, a laser light emitting device and a driving module connected with the laser light emitting device, characterized by further comprising the laser light emitting control system according to any one of claims 1 to 5, wherein the power signal generating unit is configured to generate the power signal, the switching signal generating unit is configured to generate the switching signal, the laser light emitting control system is connected with the driving module, and the laser light emitting control system is configured to output the power signal, so that the driving module drives the laser light emitting device to emit light according to the light emitting power corresponding to the amplitude of the power signal.
7. A laser light emission control method, comprising:
acquiring a power signal and a switching signal, wherein the amplitude of the power signal is positively correlated with the luminous power of the laser luminous device, and the switching signal is a pulse signal;
when the power signal and the switching signal meet a preset condition and the switching signal is at a first level, outputting the power signal to a driving module to drive the laser light-emitting device to emit light; when the power signal and the switching signal do not meet the preset condition, enabling the laser light-emitting device to pause to emit light until the next period of the switching signal;
the preset condition is that the product of the duty ratio of the current pulse of the switching signal and the luminous power does not reach a first threshold value, and the product of the pulse width of the current pulse of the switching signal and the luminous power does not reach a second threshold value.
8. The laser emission control method according to claim 7, wherein the preset condition is that the amplitude of the power signal is larger than that of the first signal; the amplitude of the first signal decreases as the duration of the first level of the switching signal increases and increases as the duration of the second level of the switching signal increases.
9. The laser emission control method according to claim 8,
adding one to a count value per unit time duration of a first level of the switching signal;
decrementing the count value by one at each sustained unit time of the second level of the switching signal;
and dividing a preset value by the counting value to be used as the current amplitude of the first signal.
10. The method according to claim 7, wherein the first threshold is 1000, the second threshold is 1000, the pulse width is in milliseconds, the light emitting power and the duty cycle are both in percentage, and the light emitting power is 100 times the maximum continuous output current of the laser light emitting device at 10 times.
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