CN117410821A - Adjustable duty cycle circuit, method and processing system - Google Patents
Adjustable duty cycle circuit, method and processing system Download PDFInfo
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- CN117410821A CN117410821A CN202311725408.0A CN202311725408A CN117410821A CN 117410821 A CN117410821 A CN 117410821A CN 202311725408 A CN202311725408 A CN 202311725408A CN 117410821 A CN117410821 A CN 117410821A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
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Abstract
The embodiment of the specification provides a frequency-adjustable duty cycle circuit, a method and a processing system, wherein the frequency-adjustable duty cycle circuit comprises: a signal generation unit configured to generate an initial clock signal; the signal adjusting unit is provided with a plurality of signal transmission channels and is configured to determine target parameters according to an input adjusting instruction and a mapping relation between a preset adjusting instruction and the adjusting parameters, and adjust the duty ratio and the frequency of an initial clock signal according to the target parameters to generate a target clock signal; the voltage regulating unit is configured to convert the connected power supply voltage to obtain a driving voltage with a set voltage value; the switch units are connected with the lasers and the signal transmission channels in a one-to-one correspondence manner and are configured to conduct the paths between the laser modules and the signal adjustment units under the driving of the driving voltage when the target clock signals are acquired, so that the corresponding lasers emit light. By adopting the technical scheme, the laser luminous parameters can be accurately controlled.
Description
Technical Field
The embodiment of the specification relates to the technical field of switch driving, in particular to a circuit, a method and a processing system capable of adjusting a duty ratio.
Background
With the development of laser technology, different types of lasers are emerging. As one of them, a semiconductor laser has advantages of small volume, light weight, high efficiency, low energy consumption, long life, and the like, and is widely used in different fields.
When using a semiconductor laser, accurate control of the emission parameters of the laser is a key factor in improving the performance of the circuit in which the laser is used. However, as the laser continues to operate, the emission parameters of the laser may fluctuate, even with false conduction.
Under the background, how to provide a technical solution to realize accurate control of the light emitting parameters of the laser becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a tunable duty cycle circuit, a tunable duty cycle method, and a processing system, which can realize precise control of the laser emission parameters.
In a first aspect, embodiments of the present disclosure provide a tunable duty cycle circuit, the laser module includes a plurality of lasers, the tunable duty cycle circuit signal generating unit, the signal conditioning unit, the voltage conditioning unit, and the plurality of switching units, wherein:
The signal generating unit is configured to generate an initial clock signal;
the signal adjusting unit is provided with a plurality of signal transmission channels and is configured to determine a target parameter according to an input adjusting instruction and a mapping relation between a preset adjusting instruction and an adjusting parameter, adjust the duty ratio and the frequency of the initial clock signal according to the target parameter, generate a target clock signal and transmit the target clock signal to at least one of the switch units through at least one signal transmission channel;
the voltage regulating unit is configured to convert the connected power supply voltage to obtain a driving voltage with a set voltage value, and output the driving voltage to at least one of the switching units;
the switch units are connected with the lasers and the signal transmission channels in a one-to-one correspondence manner and are configured to conduct the paths between the laser modules and the signal adjusting units under the driving of the driving voltage when the target clock signals are acquired, so that the corresponding lasers emit light.
In the above embodiment, the target parameter is determined according to the mapping relationship between the preset adjustment command and the adjustment parameter, so that the duty cycle and the frequency of the initial clock signal can be adjusted to the target parameter, and each laser can emit light according to the set duty cycle and frequency under the action of the target clock signal and the driving voltage by providing the driving voltage with the set voltage value for the switching unit, so as to realize accurate control of the light emitting parameters of the laser.
Optionally, the voltage regulating unit includes:
the voltage regulating module is configured to regulate and convert the voltage value provided by the power supply voltage to obtain corresponding current parameters; and is configured to adjust the current parameter according to the sampled voltage and the set voltage value;
the voltage sampling module is suitable for collecting current parameters output to the switching unit, obtaining corresponding sampling voltage serving as the driving voltage, and outputting the sampling voltage to the voltage regulating module and the switching unit.
In the above embodiment, by collecting the current parameter output to the switching unit, the corresponding sampling voltage value can be determined, and then the current parameter can be adjusted by the sampling voltage and the set voltage value, so that the voltage adjusting unit can provide a stable driving voltage for the switching unit, and the stability of the laser light emission is improved.
Optionally, the voltage sampling module includes: the voltage regulator comprises an inductor, a first feedback resistor and a second feedback resistor, wherein the first end of the inductor is connected with the output end of the voltage regulating module, the second end of the inductor is respectively connected with the switch unit and the first end of the first feedback resistor, the second end of the first feedback resistor is respectively connected with the feedback end of the voltage regulating module and the first end of the second feedback resistor, and the second end of the second feedback resistor is grounded.
In the above embodiment, the collected sampled voltage value can be fed back to the voltage adjusting module by using the sampling circuit composed of the inductor, the first feedback resistor and the second feedback resistor, and the circuit structure can be simplified.
Optionally, the voltage regulating unit further includes:
the voltage stabilizing module is arranged between the voltage regulating module and the power supply voltage;
and/or
The filtering module is arranged between the voltage sampling module and the switch unit.
In the embodiment, by arranging the voltage stabilizing module, the voltage fluctuation input to the voltage regulating unit can be reduced, and the circuit stability is improved; by arranging the filtering module, noise in the driving voltage can be filtered, the accuracy of the obtained target clock signal is improved, and the accurate control of the laser light-emitting parameters is further improved.
Optionally, the tunable duty cycle circuit further comprises: and one impedance matching unit corresponds to the plurality of switch units and the plurality of signal transmission channels, wherein the impedance matching unit is arranged between the signal transmission channels and the switch units and is configured to match impedance values of the signal adjusting unit and the laser.
In the above embodiment, by providing a plurality of impedance matching units, and one impedance matching unit corresponding to a plurality of switching units and a plurality of signal transmission channels, stability in the transmission process of the target clock signal and the driving voltage can be improved, and attenuation of the target clock signal and the driving voltage can be reduced.
Optionally, any of the impedance matching units includes: the first end of the first matching resistor is connected with one signal transmission channel of the two signal transmission channels, the second end of the first matching resistor is connected with the first end of the second matching resistor and one of the two switch units, the first end of the third matching resistor is connected with the other signal transmission channel of the two signal transmission channels, the second end of the third matching resistor is connected with the first end of the fourth matching resistor and the other switch unit of the two switch units, and the second end of the second matching resistor is connected with the second end of the fourth matching resistor and grounded.
In the above-described embodiment, by making the impedance matching unit include the first matching resistor, the second matching resistor, the third matching resistor, and the fourth matching resistor, it is possible to simplify the circuit configuration while realizing impedance matching.
Optionally, any of the switching units includes a transistor, a gate of the transistor is connected to the signal transmission channel, a source of the transistor is connected to the voltage adjusting unit, and a drain of the transistor is connected to the laser.
In the above embodiment, through the transistor, the light emitting gating process of the corresponding laser can be realized, the implementation manner is simple, and the circuit structure can be simplified.
Optionally, the tunable duty cycle circuit further comprises: the monitoring unit is connected with the signal transmission channel and is configured to acquire the target clock signal and output the target clock signal to the signal regulating unit;
the signal conditioning unit is further configured to readjust the initial clock signal upon determining that the duty cycle and/or frequency of the target clock signal does not coincide with the set duty cycle and/or frequency.
In the above embodiment, by the monitoring unit and the signal adjusting unit, when it is determined that the duty ratio and/or the frequency of the target clock signal do not coincide with the set duty ratio and/or frequency, the initial clock signal may be readjusted to ensure the accuracy of the target clock signal output to each laser.
In a second aspect, embodiments of the present disclosure also provide a processing system, comprising:
a laser module adapted to provide a light source, the laser module comprising a plurality of lasers;
the tunable duty cycle circuit of any of the preceding embodiments, coupled to the laser module, adapted to provide a target clock signal and a driving voltage for each laser to drive each laser to emit light.
In the embodiment, by using the frequency-adjustable duty cycle circuit in the processing system, the laser light emitting parameters can be precisely controlled, so as to meet the processing requirements.
Alternatively, the process may be carried out in a single-stage,
the laser module comprises a plurality of laser groups, each laser group comprises a plurality of lasers, anodes of the plurality of lasers are connected to the adjustable duty cycle circuit, and cathodes of the plurality of lasers are grounded; wherein the product of the plurality of laser groups and the plurality of laser groups is the total number of lasers in the laser module;
and/or
The laser module comprises a plurality of laser groups, each laser group comprises a plurality of lasers, cathodes of the plurality of lasers are coupled to the adjustable duty cycle circuit, and anodes of the plurality of lasers are grounded; wherein the product of the plurality of laser groups and the plurality of laser groups is the total number of lasers in the laser module.
In a third aspect, an embodiment of the present disclosure further provides a tunable duty cycle method applied to the tunable duty cycle circuit described in any one of the foregoing embodiments, to adjust a light emitting parameter of each laser in a laser module, where the tunable duty cycle method includes:
generating an initial clock signal;
determining a target parameter according to an input adjusting instruction and a mapping relation between a preset adjusting instruction and an adjusting parameter, adjusting the duty ratio and the frequency of the initial clock signal according to the target parameter, generating a target clock signal, and transmitting the target clock signal through at least one signal transmission channel in the adjustable duty ratio circuit;
converting the connected power supply voltage to obtain a driving voltage with a set voltage value;
and conducting a passage between the laser module and the signal adjusting unit under the driving of the target clock signal and the driving voltage so as to enable the corresponding laser to emit light.
In the above embodiment, the target parameter is determined according to the mapping relationship between the preset adjustment command and the adjustment parameter, so that the duty cycle and the frequency of the initial clock signal can be adjusted to the target parameter, and each laser can emit light according to the set duty cycle and frequency under the action of the target clock signal and the driving voltage by providing the driving voltage with the set voltage value for the switching unit, so as to realize accurate control of the light emitting parameters of the laser.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a duty cycle circuit with adjustable frequency in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a duty cycle circuit with adjustable frequency according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a specific structure of a voltage adjusting unit in the example of the present disclosure;
FIG. 4 is a schematic diagram showing a specific structure of another duty cycle circuit with adjustable duty cycle in the example of the present disclosure;
FIG. 5 is a schematic diagram showing a specific structure of another duty cycle circuit with adjustable frequency according to the embodiment of the present disclosure;
FIG. 6 is a schematic view showing a specific construction of a processing system according to an example of the present specification;
fig. 7 is a flowchart of a method for adjusting duty cycle according to an embodiment of the present disclosure.
Detailed Description
As described in the background art, when a semiconductor laser is used, as the laser continues to operate, the emission parameters of the laser may fluctuate, and even be turned on by mistake.
In order to solve the above technical problems, the embodiments of the present disclosure provide an adjustable duty cycle circuit, where the adjustable duty cycle circuit may be connected to a laser module, and the laser module may include a plurality of lasers, and since a target parameter is determined according to a mapping relationship between a preset adjustment instruction and an adjustment parameter, the duty cycle and the frequency of the initial clock signal may be adjusted to the target parameter, and a driving voltage having a set voltage value is provided to a switching unit, so that each laser may emit light according to the set duty cycle and frequency under the action of the target clock signal and the driving voltage, so as to implement accurate control of the laser light emitting parameter.
In order that those skilled in the art may better understand the operation mechanism, principle and advantages of the adjustable duty cycle circuit according to the embodiments of the present disclosure, a detailed description will be made with reference to specific embodiments with reference to the accompanying drawings.
Referring to the schematic structure of an adjustable duty cycle circuit in the embodiment of the present disclosure shown in fig. 1, in some embodiments of the present disclosure, the adjustable duty cycle circuit 100 may be connected to a laser module 200, and the laser module 200 may include a plurality of lasers (for example, lasers LD1 to LDp, where p is an integer greater than 1).
Accordingly, the tunable duty cycle circuit 100 may include: a signal generating unit 110, a signal adjusting unit 120, a voltage adjusting unit 130, and a plurality of switching units (e.g., switching units 141 to 14p illustrated in fig. 1), wherein:
the signal generation unit 110 may be configured to generate an initial clock signal;
the signal conditioning unit 120 may have a plurality of signal transmission channels (for example, signal transmission channels 121 to 12p illustrated in fig. 1), and the signal conditioning unit 120 may be configured to determine a target parameter according to an input conditioning command and a mapping relationship between a preset conditioning command and a conditioning parameter, and adjust a duty cycle and a frequency of the initial clock signal according to the target parameter, generate a target clock signal, and transmit the target clock signal to at least one of the switching units through at least one of the signal transmission channels;
the voltage adjusting unit 130 may be configured to convert the connected power voltage to obtain a driving voltage having a set voltage value, and output the driving voltage to at least one of the switching units, for example, one of the switching units 141 to 14 p;
The switch units can be connected with the lasers and the signal transmission channels in a one-to-one correspondence manner, and are configured to conduct the paths between the laser modules and the signal adjusting units under the driving of the driving voltage when the target clock signals are acquired, so that the corresponding lasers emit light.
Referring to fig. 1, the switching unit 141 may be connected to the laser LD1 and the signal transmission channel 121, respectively, for turning on a path between the laser LD1 and the signal transmission channel 121 according to a target clock signal output from the signal transmission channel 121, thereby driving the laser LD1 to emit light; the switch unit 142 may be connected to the laser LD2 and the signal transmission channel 122, respectively, and is configured to turn on a path between the laser LD2 and the signal transmission channel 122 according to a target clock signal output by the signal transmission channel 122, so as to drive the laser LD2 to emit light; …; the switching unit 14p may be connected to the laser LDp and the signal transmission channel 12p, respectively, and is configured to turn on a path between the laser LDp and the signal transmission channel 12p according to a target clock signal output by the signal transmission channel 12p, so as to drive the laser LDp to emit light.
Specifically, according to the input adjustment instruction and the mapping relationship between the preset adjustment instruction and the adjustment parameter, the signal adjustment unit 120 may determine the target parameter, and further may adjust the initial clock signal generated by the signal generation unit 110 according to the target parameter, so as to obtain a target clock signal with a target duty cycle and a frequency, and transmit the target clock signal to the switch unit through at least one signal transmission channel, for example, through the signal transmission channel 121, and transmit the target clock signal to the switch unit 141.
Meanwhile, the voltage adjusting unit 130 may convert the connected power voltage VDD to obtain a driving voltage having a set voltage value, and output the driving voltage to the switching unit, for example, to the switching unit 141.
The path between the laser module 200 and the signal conditioning unit 120 may be turned on under the target clock signal and the driving voltage, so that the corresponding laser emits light. For example, the laser LD1 may emit light by turning on a path between the laser LD1 and the signal transmission channel 121.
It will be appreciated that the above-described process of driving the laser LD1 to emit light is merely illustrative, and is used to illustrate that the light emitting state (light emitting timing and light emitting parameters) of the laser can be controlled by using the tunable duty cycle circuit in the embodiment of the present specification, and is not to be construed as limiting the present invention.
It should be noted that, in some other embodiments, the tunable duty cycle circuit may also drive multiple lasers to emit light at the same time, and the specific driving process may refer to the description of the laser LD1, which is not repeated here.
By adopting the adjustable duty cycle circuit in the example, as the target parameter is determined according to the mapping relation between the preset adjusting instruction and the adjusting parameter, the duty cycle and the frequency of the initial clock signal can be adjusted to the target parameter, and each laser can emit light according to the set duty cycle and frequency under the action of the target clock signal and the driving voltage by providing the driving voltage with the set voltage value for the switching unit, so that the accurate control of the light emitting parameters of the laser is realized.
For better understanding and implementation by those skilled in the art, some examples of implementations of the various elements in the adjustable duty cycle circuit of the present specification are shown below.
In some embodiments, the signal conditioning unit may generate the target clock signal in at least one of:
1) The signal adjusting unit may adjust the duty ratio of the initial clock signal according to a target parameter by adopting a preset first step adjustment mode when the frequency of the initial clock signal is fixed, so as to generate the target clock signal.
In short, the frequency of the initial clock signal is fixed, and only the duty cycle of the initial clock signal is adjusted.
The first step adjustment mode is to adjust the duty ratio of the initial clock signal to be close to the target duty ratio, and then adjust the initial clock signal according to a preset first step size (which can be regarded as a smaller duty ratio adjustment value) until the duty ratio of the target clock signal is the target duty ratio.
2) The signal adjusting unit may adjust the frequency of the initial clock signal according to a target parameter by adopting a preset second step adjustment mode when the duty ratio of the initial clock signal is fixed, so as to generate the target clock signal.
In short, the duty cycle of the initial clock signal is fixed, and only the frequency of the initial clock signal is adjusted.
The second step adjustment mode is to adjust the frequency of the initial clock signal to be close to the target frequency, and then adjust the frequency according to a preset second step size (which can be considered as a smaller frequency adjustment value) until the frequency of the target clock signal is the target duty cycle.
It should be noted that the above two ways of generating the target clock signal are only exemplary. In some other embodiments, the duty cycle and frequency of the initial clock signal may also be adjusted simultaneously to obtain the target clock signal.
By adopting the mode, the duty ratio and/or the frequency of the initial clock signal are/is adjusted, so that a proper target clock signal can be provided for each laser, and the lasers can emit light sources required by processing scenes.
In some examples, the signal conditioning unit may be implemented by a phase-locked loop and a processor, where the processor is configured to determine a target parameter corresponding to the conditioning instruction, and the phase-locked loop may adjust a duty cycle and a frequency of the initial clock signal according to the target parameter to obtain the target clock signal.
In some embodiments of the present disclosure, referring to fig. 1, and referring to a specific schematic diagram of an adjustable duty cycle circuit in the embodiment of the present disclosure shown in fig. 2, as shown in fig. 2, the voltage adjusting unit 130 may include: a voltage regulation module 131 and a voltage sampling module 132, wherein:
the voltage adjusting module 131 is configured to adjust and convert a voltage value provided by the power supply voltage VDD to obtain a corresponding current parameter; and is configured to adjust the current parameter according to the sampled voltage and the set voltage value;
the voltage sampling module 132 is adapted to collect current parameters output to the switching unit, obtain a corresponding sampling voltage as the driving voltage, and output the sampling voltage to the voltage adjusting module and the switching unit.
Referring to fig. 1 and fig. 2, the voltage adjusting module 131 may adjust and convert a voltage value provided by the power supply voltage VDD to obtain a corresponding current parameter, and the voltage sampling module 132 may collect the current parameter and feed back the obtained sampled voltage to the voltage adjusting module 131, so that the voltage adjusting module 131 may adjust the current parameter according to the sampled voltage and the set voltage value.
For example, the voltage adjustment module 131 may decrease the current parameter when the sampled voltage is greater than the set voltage value; when the sampled voltage value is less than the set voltage value, the voltage adjustment module 131 may increase the current parameter,
that is, by adjusting the current parameter, the sampled voltage value can be the same as the set voltage value, and the voltage adjusting unit can provide a stable driving voltage for the switching unit, so that the stability of the laser light emission is improved.
In some implementations, referring to fig. 2, referring to a schematic structural diagram of a voltage regulation unit in the embodiment of the present disclosure shown in fig. 3, as shown in fig. 3, the voltage sampling module 132 may include: inductance L, first feedback resistor R f1 And a second inverseFeed resistor R f2 Wherein a first end of the inductor L may be connected to the output end of the voltage regulation module 131, and a second end of the inductor L may be connected to the switching unit (specifically any one of the switching units 141 to 14 p), the first feedback resistor R, respectively f1 Is connected with the first end of the first feedback resistor R f1 Can be respectively connected with the feedback end of the voltage regulating module 131 and the second feedback resistor R f2 Is connected with the switch unit, the second feedback resistor R f2 Is grounded.
In some examples, a second feedback resistor R f2 The voltage drop across it is taken as the sampled voltage.
Through inductance L and first feedback resistance R f1 And a second feedback resistor R f2 The sampling circuit can feed back the collected sampling voltage to the voltage regulating module, and the circuit structure can be simplified.
In some examples, with continued reference to fig. 3, the voltage regulation module 131 may be implemented by a buck conversion chip circuit, wherein the voltage regulation module 131 may have 6 ports, specifically: an input port VIN connected to a power supply voltage VDD; an enable port EN connected to the power supply voltage VDD; expanding NC; a feedback port VTD respectively connected with the first feedback resistor R f1 And a first feedback resistor R f2 Is connected to the first end of the housing; two output ports SW, which are interconnected and connected to the first end of the inductor L; two ground ports GND, and the two output ports GND are interconnected and grounded.
In some examples, the voltage regulating unit may further include a buck module considering that the voltage value corresponding to the power supply voltage VDD is higher and the voltage value required to enable the port EN is lower, based on which, with continued reference to fig. 3, the buck module may be a buck resistor R1 in some examples.
It should be understood that the specific structures of the voltage adjusting module and the voltage sampling module in the above examples are only illustrative, and are used to illustrate that the voltage adjusting module and the voltage sampling module can make the sampled voltage value the same as the set voltage value, and the voltage adjusting unit can provide a stable driving voltage for the switching unit. In other examples, other configurations of voltage regulation modules and voltage sampling modules may also be employed.
In some embodiments, the structure of the voltage adjusting unit may be further expanded in order to improve the stability of the driving voltage.
As an alternative example, with continued reference to fig. 2 and 3, the voltage regulating unit may further include: a voltage stabilizing module 133 and/or a filtering module 134, wherein:
the voltage stabilizing module 133 may be disposed between the voltage adjusting module 131 and the power supply voltage VDD; the filtering module 134 may be disposed between the voltage sampling module 132 and the switching unit, for example, the filtering module 134 may be disposed between the voltage sampling module 132 and the switching unit 141.
By arranging the voltage stabilizing module, the voltage fluctuation input to the voltage regulating unit can be reduced, and the circuit stability is improved; by arranging the filtering module, noise in the driving voltage can be filtered, the accuracy of the obtained target clock signal is improved, and the accurate control of the laser light-emitting parameters is further improved.
In some embodiments, as shown in fig. 3, the voltage stabilizing module 133 may include a first voltage stabilizing capacitor C1 and a second voltage stabilizing capacitor C2, where a first end of the first voltage stabilizing capacitor C1 may be connected to the power supply voltage VDD, a first end of the second voltage stabilizing capacitor C2, and the voltage regulating module 131 (specifically, the input port VIN), respectively; the second end of the first voltage stabilizing capacitor C1 may be connected to the second end of the second voltage stabilizing capacitor C2 and ground, respectively.
In some embodiments, as shown in fig. 3, the filtering module 134 may include a first filtering capacitor C3 and a second filtering capacitor C4, where a first end of the first filtering capacitor C3 may be respectively connected with the voltage adjusting module 131 (specifically, a second end of the inductor L), a first end of the second filtering capacitor C4, and the feedback resistor R f Is connected to the first end of the housing; the second end of the first filter capacitor C3 may be connected to the second end of the second filter capacitor C4 and ground, respectively.
It should be noted that the filtering module may also be other components capable of filtering noise, for example, the filtering module may include a filtering device composed of at least two elements of capacitance, resistance or inductance, which is not limited in any way in the embodiment of the present disclosure.
From the foregoing, it can be seen that the target clock signal and the driving voltage generated by the tunable duty cycle circuit are transmitted to the laser module to drive the laser to emit light.
To improve stability during transmission of the target clock signal and the driving voltage and reduce attenuation of the target clock signal and the driving voltage during transmission, the tunable duty cycle circuit in the embodiments of the present disclosure may further include: and one impedance matching unit corresponds to the plurality of switch units and the plurality of signal transmission channels, wherein the impedance matching unit is arranged between the signal transmission channels and the switch units and is configured to match impedance values of the signal adjusting unit and the laser.
As an example, with continued reference to fig. 2, the adjustable duty cycle circuit 100 may include: impedance matching units 151 to 15n, wherein the impedance matching unit 151 may correspond to the switching units 141, 142, and the signal transmission channels 121, 122, respectively; the impedance matching unit 15n may correspond to the switching units 14m, 14p, and the signal transmission channels 12 m, 12p, respectively. Where n may be equal to 0.5p and m may be equal to p-1.
For ease of understanding, a specific structure of the impedance matching unit is explained taking the example in which the impedance matching unit 151 is exemplified.
In some examples, referring to fig. 2 in combination, referring to a specific structural schematic diagram of another adjustable duty cycle circuit in the embodiment of the present disclosure in fig. 4, as shown in fig. 4, the impedance matching unit 151 may include: the first end of the first matching resistor R3 may be connected with the signal transmission channel 121, the second end of the first matching resistor R1 may be connected with the first end of the second matching resistor R4 and the switch unit 141, the first end of the third matching resistor R3 may be connected with the signal transmission channel 122, the second end of the third matching resistor R5 may be connected with the first end of the fourth matching resistor R6 and the switch unit 142, and the second end of the second matching resistor R4 may be connected with the second end of the fourth matching resistor R6 and grounded.
In some examples, to further reduce the external interference, with continued reference to fig. 4, the impedance matching unit 151 may further include a first matching capacitor C5 and a second matching capacitor C6, wherein the first matching capacitor C5 may be connected to a first end of the first matching resistor R3 and a first end of the second matching resistor R4, and a second end thereof may be connected to the switching unit 141; the second matching capacitor C6 may be connected to the first terminal of the third matching resistor R5 and the first terminal of the fourth matching resistor R6, and the second terminal thereof may be connected to the switching unit 142.
In some examples, with continued reference to fig. 4, the switching unit 141 may include a transistor, wherein a gate G of the transistor may be connected to the signal transmission channel 121, a source S of the transistor is connected to the voltage regulating unit 130 (e.g., to a voltage sampling module), and a drain D of the transistor is connected to the laser LD 1.
The switching unit 142 may include a transistor, wherein a gate G of the transistor may be connected to the signal transmission channel 122, a source S of the transistor is connected to the voltage adjusting unit 130, for example, to a voltage sampling unit), and a drain D of the transistor is connected to the laser LD 2.
In some other embodiments, the switching unit may be a GaN power device, a triode, an IGBT, or the like, and the embodiment of the present disclosure does not limit the type of the switching unit, so long as it can perform a switching function. For example, the switching unit may be an NMOS transistor.
In some examples, laser LD1 and laser LD2 may be connected with a common cathode. In some other examples, laser LD1 and laser LD2 may be connected with a common anode.
In some embodiments, the signal generating unit may be a crystal oscillator, which may generate a relatively fixed oscillation signal as the signal adjusting unit, and the signal adjusting unit may adjust the frequency and the duty cycle of the signal adjusting unit to obtain the target clock signal.
In order to facilitate understanding and implementation of the operation of the tunable duty cycle circuit in the embodiments of the present disclosure, a schematic description will be given below with respect to driving the laser LD1 to emit light.
Referring to fig. 1 to 4 in combination, a schematic structural diagram of another adjustable duty cycle circuit in the embodiment of the present disclosure shown in fig. 5 is referred to, wherein the specific structure of the adjustable duty cycle circuit and the connection relationship between the devices may be referred to the foregoing examples, which are not described herein.
The working principle is as follows: in response to an input adjustment command (which may be manually input or may be acquired from another unit), the signal adjustment unit 120 may determine a target parameter corresponding to the adjustment command, and may further adjust the initial clock signal generated by the signal generation unit 110, obtain a target clock signal, and output the target clock signal to the impedance matching unit 151 through the signal transmission channel 121.
Under the action of the first matching resistor R3, the second matching resistor R4, the third matching resistor R5, the fourth matching resistor R6, the first matching capacitor C5 and the second matching capacitor C6, the impedance between the laser LD1 and the signal adjusting unit 120 can be matched, the stability of the target clock signal in the transmission process is improved, and the target clock signal can be transmitted to the gate of the transistor through the signal transmission channel 121.
Meanwhile, the first voltage stabilizing capacitor C1 and the second voltage stabilizing capacitor C2 can stabilize the power supply voltage VDD to be the voltage value provided by the voltage conversion module 131, and further output the current parameter to the inductor L through the output port SW of the voltage conversion module 131, the first filter capacitor C3 and the second filter capacitor C4 can eliminate the noise in the current parameter, and the feedback resistor R f The current parameters are collected to obtain a sampling voltage, and the sampling voltage is output to a feedback port VTD of the voltage conversion module 131, so that the voltage conversion module 131 provides a driving voltage with a set voltage value for the source electrode of the transistor by adjusting the current parameters.
When the transistor acquires the driving voltage and the target clock signal at the same time, the transistor is turned on, and the laser LD1 can emit light.
It should be noted that, the first fig. 5 illustrates that the laser module has two lasers, and the description is given by taking the laser LD1 as an example, and for other lasers, all the lasers can emit light in the above manner; second, fig. 5 illustrates a manner in which one voltage adjustment unit is used to power one switching unit, and in some other examples, multiple switching units may also be powered by way of one voltage adjustment unit and multiple gating units; third, when the laser module has more lasers, the lasers can be connected to the circuit by referring to the connection modes of the lasers LD1 and LD 2.
It will be appreciated that while the embodiments provided herein have been described above with respect to various embodiments, the various alternatives identified by the various embodiments may be combined with each other and cross-referenced without conflict, thereby extending what is believed to be the embodiments disclosed and disclosed herein.
For example, in some examples, the tunable duty cycle circuit in embodiments of the present description may further include: and the monitoring unit can be connected with the signal transmission channel and is configured to acquire the target clock signal and output the target clock signal to the signal regulating unit.
Accordingly, the signal conditioning unit may be further configured to re-condition the initial clock signal upon determining that the duty cycle and/or frequency of the target clock signal does not coincide with the set duty cycle and/or frequency.
Specifically, the monitoring unit may monitor the target clock signal output by the signal transmission channel in real time and output the target clock signal to the signal adjusting unit, so that the signal adjusting unit may readjust the initial clock signal when determining that the duty cycle and/or frequency of the target clock signal are inconsistent with the set duty cycle and/or frequency, so as to provide the target clock signal meeting the requirement for the laser.
In some embodiments, whether the actually output target clock signal meets the requirement can be determined according to the duty ratio between the actually output target clock signal and the set target clock signal.
As mentioned above, a plurality of lasers may be included in the laser module, and there may be some lasers whose emission parameters already meet the emission requirements, without adjusting the target clock signals input to these lasers.
As a specific example, the tunable duty cycle circuit in the embodiments of the present disclosure may further include: and the light intensity detection unit is connected with the signal adjustment unit and is configured to detect the luminous power of each laser and generate a corresponding light intensity detection signal to the signal adjustment unit.
Accordingly, the signal adjustment unit is further configured to adjust the target clock signal output to the corresponding laser when it is determined that the light intensity detection signal contains a light emitting power lower than the set light emitting power.
Specifically, when the lasers emit light, the light intensity detection unit may detect the light emission power (may be regarded as the light emission intensity) of each laser, and the signal adjustment unit may determine the relative relationship between the light emission power of each laser and the set light emission power, and when it is determined that the light emission power of the laser is lower than the set light emission power (indicating that the voltage output to the laser cannot cause the laser to be in the set operation state), readjust the target clock signal so that at least one of the lasers emits light in accordance with the regenerated target clock signal.
In some embodiments, the light intensity detection unit may include a photodiode PD, and the photodiode PD may convert an optical signal output by the laser into an electrical signal, and the control unit may determine whether the light emitting power of each laser satisfies the set power according to the electrical signal.
In implementations, the emission parameters of the laser may be set to emit light patterns for different scenarios and different operating parameter requirements. For example, the power, brightness, illumination duration, dimming value (such as color temperature and color) of the laser and the combination of the lighted lasers can be set for different processing scenes, for example, multiple lasers on the same array emit light, or the lasers on different arrays emit light, so that multiple illumination modes can be configured.
As an alternative implementation example, the tunable duty cycle circuit in the embodiments of the present specification may further include a configuration unit, which may be connected to the signal adjustment unit and configured to configure the content of the adjustment instruction based on configuration data.
In some alternative implementation examples, corresponding filter circuits may be provided at the signal generating unit and the signal conditioning unit to reduce interference of external noise on the initial clock signal.
In a specific implementation, the laser driving circuit in the above embodiment may be applied to any device that needs to drive a laser, and a specific application example is given below.
Referring to fig. 6, which is a schematic structural diagram of a processing system in an embodiment of the present disclosure, in some embodiments of the present disclosure, the processing system 300 may include a laser module 200 and the tunable duty cycle circuit 100 according to any of the foregoing embodiments, wherein:
the laser module 200 is adapted to provide a processing light source, the laser module 200 may comprise a plurality of lasers (see lasers LD1 to LDp in fig. 1);
the tunable duty cycle circuit 100, coupled to the laser module 200, is adapted to provide a target clock signal and a driving voltage to each laser to drive each laser to emit light.
The specific structure and the light emitting principle of the laser module 200 can be referred to the foregoing examples, and will not be described herein in detail.
The specific structure and driving principle of the adjustable duty cycle circuit 100 are referred to in the foregoing examples, and will not be described in detail herein.
In some embodiments, the lasers in the laser module may be connected differently based on different application requirements.
As a specific example, a plurality of lasers in the laser modules described herein may be coupled to the tunable duty cycle circuit in a "common anode" manner.
Specifically, the laser module comprises a plurality of laser groups, each laser group comprises a plurality of lasers, anodes of the plurality of lasers are connected to the adjustable duty cycle circuit, and cathodes of the plurality of lasers are grounded; wherein the product of the plurality of laser groups and the plurality of laser groups is the total number of lasers in the laser module.
Assuming that the laser module may include P1 laser groups, each laser group may include Q1 lasers, anodes of the Q1 lasers may be respectively connected to different switching units, and cathodes of the Q1 lasers may be grounded, wherein a product of P1 and Q1 is a total number of lasers in the laser module.
As a specific example, a plurality of lasers in the laser modules described herein may be coupled to the tunable duty cycle circuit in a "common cathode" manner.
Specifically, the laser module comprises a plurality of laser groups, each laser group comprises a plurality of lasers, cathodes of the plurality of lasers are connected to the adjustable duty cycle circuit, and anodes of the plurality of lasers are grounded; wherein the product of the plurality of laser groups and the plurality of laser groups is the total number of lasers in the laser module.
Assuming that the laser module may include P2 laser groups, each laser group may include Q2 lasers, cathodes of the Q2 lasers may be connected to different switching units, respectively, and anodes of the Q2 lasers may be grounded, wherein a product of P2 and Q2 is a total number of lasers in the laser module.
It should be noted that, when the product of P1 and Q1 is fixed, the values of P1 and N1 should be such that the sum of P1 and Q1 is minimum, that is, when p1×q1=l1 and L1 is a fixed value, the value of p1+q1=x1 is the minimum value of the sum of P1 and Q1; when the product of P2 and Q2 is fixed, the values of P2 and Q2 should be such that the sum of P2 and Q2 is minimized, i.e., when p2×q2=l2 and L2 is a fixed value, the value of p2+q2=x2 is the minimum value of the sum of P2 and Q2. By minimizing the sum of P1 and Q1, and/or minimizing the sum of P2 and Q2, the chip area can be reduced while the number of lasers is ensured.
In a specific implementation, the laser in the laser module may be, for example, an edge emitting laser (Edge Emitting Laser, EEL) or a Vertical Cavity surface emitting laser (Vertical-Cavity SurfaceEmittingLaser, VCSEL), which is not limited to the type of laser used in the embodiments of the present disclosure.
The embodiments of the present disclosure further provide a method corresponding to the adjustable duty cycle circuit described in any of the above embodiments, and the detailed description is provided by specific embodiments with reference to the accompanying drawings.
A flowchart of a method for adjusting a duty cycle of a tunable light according to an embodiment of the present disclosure is shown in fig. 7, where the tunable duty cycle may be applied to the tunable duty cycle circuit described in any of the foregoing embodiments to adjust the light emitting parameters of each laser in the laser module.
Correspondingly, the adjustable duty cycle method can be specifically implemented according to the following steps:
s11, generating an initial clock signal.
S12, determining a target parameter according to an input adjusting instruction and a preset mapping relation between the adjusting instruction and the adjusting parameter, adjusting the duty ratio and the frequency of the initial clock signal according to the target parameter, generating a target clock signal, and transmitting the target clock signal through at least one signal transmission channel in the adjustable duty ratio circuit.
S13, converting the connected power supply voltage to obtain a driving voltage with a set voltage value.
And S14, conducting a passage between the laser module and the signal adjusting unit under the driving of the target clock signal and the driving voltage so as to enable the corresponding laser to emit light.
By adopting the frequency-adjustable duty ratio switching method, because the clock signal parameter value is obtained according to the preset configuration file, under the action of the target clock signal, each laser can emit light according to the duty ratio and the frequency corresponding to the target clock signal, and the accurate control of the laser light emitting parameter is realized.
It should be noted that, in the above embodiments, some steps do not have a necessary sequence, and may be executed synchronously or sequentially without contradiction, and the sequence may be exchanged. For example, when the steps of the tunable duty cycle method provided in the present specification are actually performed, step S12 and step S13 may be performed simultaneously. The step sequence is not particularly limited in the embodiment of the present specification.
Although the embodiments of the present specification are disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (11)
1. The utility model provides a but frequency modulation duty cycle circuit, its characterized in that is connected with the laser module, the laser module includes a plurality of lasers, but frequency modulation duty cycle circuit includes signal generation unit, signal conditioning unit, voltage conditioning unit and a plurality of switch unit, wherein:
The signal generating unit is configured to generate an initial clock signal;
the signal adjusting unit is provided with a plurality of signal transmission channels and is configured to determine a target parameter according to an input adjusting instruction and a mapping relation between a preset adjusting instruction and an adjusting parameter, adjust the duty ratio and the frequency of the initial clock signal according to the target parameter, generate a target clock signal and transmit the target clock signal to at least one of the switch units through at least one signal transmission channel;
the voltage regulating unit is configured to convert the connected power supply voltage to obtain a driving voltage with a set voltage value, and output the driving voltage to at least one of the switching units;
the switch units are connected with the lasers and the signal transmission channels in a one-to-one correspondence manner and are configured to conduct the paths between the laser modules and the signal adjusting units under the driving of the driving voltage when the target clock signals are acquired, so that the corresponding lasers emit light.
2. The adjustable duty cycle circuit of claim 1, wherein the voltage adjustment unit comprises:
The voltage regulating module is configured to regulate and convert the voltage value provided by the power supply voltage to obtain corresponding current parameters; and is configured to adjust the current parameter according to the sampled voltage and the set voltage value;
the voltage sampling module is suitable for collecting current parameters output to the switching unit, obtaining corresponding sampling voltage serving as the driving voltage, and outputting the sampling voltage to the voltage regulating module and the switching unit.
3. The adjustable duty cycle circuit of claim 2, wherein the voltage sampling module comprises: the voltage regulator comprises an inductor, a first feedback resistor and a second feedback resistor, wherein the first end of the inductor is connected with the output end of the voltage regulating module, the second end of the inductor is respectively connected with the switch unit and the first end of the first feedback resistor, the second end of the first feedback resistor is respectively connected with the feedback end of the voltage regulating module and the first end of the second feedback resistor, and the second end of the second feedback resistor is grounded.
4. A tunable duty cycle circuit according to claim 2 or 3, wherein the voltage regulation unit further comprises:
The voltage stabilizing module is arranged between the voltage regulating module and the power supply voltage;
and/or
The filtering module is arranged between the voltage sampling module and the switch unit.
5. The tunable duty cycle circuit of claim 1, further comprising:
and one impedance matching unit corresponds to the plurality of switch units and the plurality of signal transmission channels, wherein the impedance matching unit is arranged between the signal transmission channels and the switch units and is configured to match impedance values of the signal adjusting unit and the laser.
6. The tunable duty cycle circuit of claim 5, wherein any one of the impedance matching units comprises: the first end of the first matching resistor is connected with one signal transmission channel of the two signal transmission channels, the second end of the first matching resistor is connected with the first end of the second matching resistor and one of the two switch units, the first end of the third matching resistor is connected with the other signal transmission channel of the two signal transmission channels, the second end of the third matching resistor is connected with the first end of the fourth matching resistor and the other switch unit of the two switch units, and the second end of the second matching resistor is connected with the second end of the fourth matching resistor and grounded.
7. The tunable duty cycle circuit of claim 1, wherein any switching unit comprises a transistor, a gate of the transistor is connected to the signal transmission channel, a source of the transistor is connected to the voltage tuning unit, and a drain of the transistor is connected to the laser.
8. The tunable duty cycle circuit of claim 1, further comprising:
the monitoring unit is connected with the signal transmission channel and is configured to acquire the target clock signal and output the target clock signal to the signal regulating unit;
the signal conditioning unit is further configured to readjust the initial clock signal upon determining that the duty cycle and/or frequency of the target clock signal does not coincide with the set duty cycle and/or frequency.
9. A processing system, comprising:
a laser module adapted to provide a light source, the laser module comprising a plurality of lasers;
a tunable duty cycle circuit as claimed in any one of claims 1 to 8, coupled to the laser modules, adapted to provide a target clock signal and a drive voltage for each laser to drive each laser to emit light.
10. The processing system of claim 9, wherein the laser module comprises a plurality of laser groups, each laser group comprising a plurality of lasers, anodes of the plurality of lasers being connected to the tunable duty cycle circuit, cathodes of the plurality of lasers being grounded; wherein the product of the plurality of laser groups and the plurality of laser groups is the total number of lasers in the laser module;
and/or
The laser module comprises a plurality of laser groups, each laser group comprises a plurality of lasers, cathodes of the plurality of lasers are coupled to the adjustable duty cycle circuit, and anodes of the plurality of lasers are grounded; wherein the product of the plurality of laser groups and the plurality of laser groups is the total number of lasers in the laser module.
11. A tunable duty cycle method applied to the tunable duty cycle circuit of any one of claims 1 to 8 to adjust the emission parameters of each laser in a laser module, wherein the tunable duty cycle method comprises:
generating an initial clock signal;
determining a target parameter according to an input adjusting instruction and a mapping relation between a preset adjusting instruction and an adjusting parameter, adjusting the duty ratio and the frequency of the initial clock signal according to the target parameter, generating a target clock signal, and transmitting the target clock signal through at least one signal transmission channel in the adjustable duty ratio circuit;
Converting the connected power supply voltage to obtain a driving voltage with a set voltage value;
and conducting a passage between the laser module and the signal adjusting unit under the driving of the target clock signal and the driving voltage so as to enable the corresponding laser to emit light.
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| CN202311725408.0A CN117410821A (en) | 2023-12-15 | 2023-12-15 | Adjustable duty cycle circuit, method and processing system |
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| CN202311725408.0A CN117410821A (en) | 2023-12-15 | 2023-12-15 | Adjustable duty cycle circuit, method and processing system |
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