CN117293653A - Laser driving circuit and electronic equipment - Google Patents

Laser driving circuit and electronic equipment Download PDF

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Publication number
CN117293653A
CN117293653A CN202311549701.6A CN202311549701A CN117293653A CN 117293653 A CN117293653 A CN 117293653A CN 202311549701 A CN202311549701 A CN 202311549701A CN 117293653 A CN117293653 A CN 117293653A
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China
Prior art keywords
delay
laser
module
signal
logic processing
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Chinese (zh)
Inventor
肖岩
杨强强
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Shenzhen Lemon Photon Technology Co ltd
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Shenzhen Lemon Photon Technology Co ltd
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Priority to CN202311549701.6A priority Critical patent/CN117293653A/en
Publication of CN117293653A publication Critical patent/CN117293653A/en
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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
    • 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
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

The embodiment of the specification provides a laser driving circuit and electronic equipment, and the laser driving circuit is coupled with a laser, and the laser driving circuit includes: the device comprises a delay unit, a logic processing unit and a driving unit, wherein: the delay unit comprises a first delay module and a second delay module, wherein the first delay module is suitable for carrying out delay processing on an input square wave signal to obtain a first delay signal; the second delay module is suitable for carrying out delay processing on the input square wave signals to obtain second delay signals, wherein delay time lengths of the first delay module and the second delay module are different; the logic processing unit is suitable for generating logic processing signals for conducting a driving channel between the driving unit and the laser according to the first delay signal and the second delay signal; and the driving unit is suitable for driving the laser to emit light when the driving channel is conducted. By adopting the technical scheme, the luminous stability of the laser can be improved.

Description

Laser driving circuit and electronic equipment
Technical Field
The embodiment of the specification relates to the technical field of laser driving, in particular to a laser driving circuit and electronic equipment.
Background
With the rapid development of laser technology, lasers are widely used in various fields, such as laser radar, material processing (e.g., welding, cutting, etc.), display panels, medical science, precision machining, illumination, etc. According to different requirements, higher requirements are put on the light-emitting driving process of the laser.
In practical application, the existing laser driving circuit is unstable in the light-emitting driving process of the laser, and the use of the laser is affected.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a laser driving circuit and an electronic device, which can improve the stability of the laser light emission.
Embodiments of the present disclosure provide a laser driving circuit coupled with a laser, the laser driving circuit comprising: the device comprises a delay unit, a logic processing unit and a driving unit, wherein:
the delay unit comprises a first delay module and a second delay module, wherein the first delay module is suitable for carrying out delay processing on an input square wave signal to obtain a first delay signal; the second delay module is suitable for carrying out delay processing on the input square wave signals to obtain second delay signals, wherein delay time lengths of the first delay module and the second delay module are different;
The logic processing unit is suitable for generating logic processing signals for conducting a driving channel between the driving unit and the laser according to the first delay signal and the second delay signal;
the driving unit is suitable for driving the laser to emit light when the driving channel is conducted.
In the above embodiment, delay time lengths of the first delay module and the second delay module may be different, by setting delay time lengths of the first delay module and the second delay module, a first delay signal and a second delay signal with different delay time lengths may be obtained, and further, a logic processing unit may obtain the first delay signal and the second delay signal at different moments, and by performing logic processing on the first delay signal and the second delay signal, a logic processing signal with a set pulse width may be output, so that a driving path between the driving unit and the laser may be turned on, and the driving unit may drive the laser to emit light, thereby, the stability of the laser light may be improved.
Optionally, the first delay module includes:
a first delay sub-module, the first end of which is suitable for inputting the square wave signal;
The second delay submodule comprises a plurality of first gating channels and first capacitors, wherein the first ends of the first gating channels are coupled with the second ends of the first delay submodules, the second ends of the first gating channels are respectively coupled with the first ends of the first capacitors and the logic processing unit, the control ends of the first gating channels are suitable for inputting first control signals, and when the first gating channels are gated, the first gating channels output first delay signals with corresponding delay time lengths to the logic processing unit; the second end of the first capacitor is grounded.
In the above embodiment, when the first gate channel is gated, the size of the resistor connected to the laser driving circuit can be changed, and then when the corresponding first gate channel is gated, a delay circuit with a corresponding delay time length can be formed with the first capacitor, so that a first delay signal with different delay time lengths can be output to the logic processing unit, so as to obtain logic processing signals with different pulse widths, realize the output of various selectable pulse width signals, and further provide logic processing signals for different types of lasers or lasers in different running states.
Optionally, the first delay submodule includes an inverter.
In the above embodiment, by making the first delay submodule include an inverter, the delay function can be performed while the square wave signal is inverted.
Optionally, the first gating channel includes: the input end of the first transistor is used as the first end of the first gating channel, the output end of the first transistor is used as the second end of the first gating channel, and the control end of the first transistor is used as the control end of the first gating channel.
In the above-described embodiment, by making the first gate channel include the first transistor, the circuit configuration can be simplified while realizing the gate action.
Optionally, the second delay sub-module further includes:
the first delay resistor is respectively coupled with the output end of each first gating channel, the first end of the first capacitor and the logic processing unit.
In the above embodiment, by setting the first delay resistor, when the first gating channel in the second delay sub-module fails, the first delay resistor and the first capacitor form a delay circuit, so that the first delay module can still play a role in delay, and the working stability of the laser driving circuit is improved.
Optionally, the second delay module includes: the first end of each second gating channel is suitable for inputting the square wave signal, the second end of each second gating channel is respectively coupled with the first end of each second capacitor and the logic processing unit, the control end of each second gating channel is suitable for inputting a second control signal, and the second gating channel outputs the second delay signal with corresponding delay time to the logic processing unit when being gated; the second end of the second capacitor is grounded.
In the above embodiment, when the second gating channel is gated, the size of the resistor connected to the laser driving circuit can be changed, and when the corresponding second gating channel is gated, a delay circuit with a corresponding delay time length can be formed with the second capacitor, so that a second delay signal with different delay time lengths can be output to the logic processing unit, logic processing signals with different pulse widths can be obtained, output of various selectable pulse width signals can be realized, and logic processing signals can be provided for different types of lasers or lasers in different running states.
Optionally, the second gating channel includes: and the input end of the second transistor is used as the first end of the second gating channel, the output end of the second transistor is used as the second end of the second gating channel, and the control end of the second transistor is used as the control end of the first gating channel.
In the above-described embodiment, by making the second gate channel include the second transistor, the circuit structure can be simplified while realizing the gate action.
Optionally, the second delay module further includes: and the second delay resistors are respectively coupled with the output end of each second gating channel, the first end of the second capacitor and the logic processing unit.
In the above embodiment, by setting the second delay resistor, when the second gating channel in the third delay sub-module fails, the second delay resistor and the second capacitor form a delay circuit, so that the second delay module can still play a role in delay, and the working stability of the laser driving circuit is improved.
Optionally, the logic processing unit includes: and the first input end of the logic gate is coupled with the first delay module, the second input end of the logic gate is coupled with the second delay module, the output end of the logic gate is coupled with the driving unit, and the logic gate is suitable for performing AND logic processing on the first delay signal and the second delay signal and outputting corresponding logic processing results to serve as the logic processing signals.
In the above embodiment, since the first delay signal and the second delay signal have time differences, the AND logic gate can acquire the first delay signal and the second delay signal at different moments, and the AND logic gate can logically AND the first delay signal and the second delay signal through the competition relationship between the first delay signal and the second delay signal, and output logic processing signals with specific pulse width and amplitude, so that the laser can emit light according to the set light emitting parameters, and the light emitting stability of the laser is improved.
Optionally, the driving unit includes: voltage source, switch module and energy storage module, wherein:
the first end of the switch module is respectively coupled with the voltage source and the energy storage module, the second end of the switch module is coupled with the anode of the laser, and the control end of the switch module is coupled with the output end of the logic processing unit and is suitable for responding to the logic processing signal to conduct a driving channel between the energy storage module and the laser;
an energy storage module coupled to the voltage source and the laser, respectively, adapted to store energy provided by the voltage source, and adapted to provide the stored energy to the laser when a drive path between the energy storage module and the laser is turned on.
In the above embodiment, by controlling the on-off state of the switch module, and when the driving path between the energy storage module and the laser is turned on, the energy storage module can provide the stored energy for the laser, so that the laser can be driven to emit light stably according to the set light emitting parameters.
Optionally, the driving unit further includes: and the energy storage adjusting module is respectively coupled with the voltage source, the energy storage module and the switch module and is suitable for adjusting the energy storage speed of the energy storage module.
In the above embodiment, the light emitting process of the laser can be adjusted by adjusting the energy storage speed of the energy storage module so as to adapt to different requirements.
Optionally, the laser driving circuit further includes: and the clamping unit is coupled with the driving unit and the laser respectively and is suitable for limiting the voltage amplitude provided by the driving unit for the laser.
In the above embodiment, by limiting the voltage amplitude provided by the driving unit to the laser, the laser can be ensured to work in a safe voltage, and the stability of the laser light emission is further improved.
The embodiment of the specification also provides an electronic device, including: the laser driving circuit of any of the preceding embodiments, and a laser connected to the laser driving circuit.
Drawings
Fig. 1 is a schematic diagram showing a structure of a laser driving circuit in an embodiment of the present specification;
fig. 2 shows a schematic structural diagram of a first delay module in an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a second delay module according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram showing a specific structure of a laser driving circuit in the embodiment of the present specification;
FIG. 5 shows waveforms of a logic processing junction signal in an embodiment of the present disclosure;
fig. 6 is a schematic diagram showing a specific structure of another laser driving circuit in the embodiment of the present specification;
fig. 7 shows a schematic structural diagram of an electronic device in an embodiment of the present specification.
Detailed Description
As described in the background art, the existing laser driving circuit is unstable to the light emission driving process of the laser, and affects the use of the laser.
To solve the above technical problem, embodiments of the present disclosure provide a laser driving circuit, which may be coupled with a laser, wherein the laser driving circuit may include: the delay unit, the logic processing unit and the driving unit are used for setting delay time lengths of the first delay module and the second delay module, so that a first delay signal and a second delay signal with different delay time lengths can be obtained, the logic processing unit can further acquire the first delay signal and the second delay signal at different moments, and the logic processing unit is used for logically processing the first delay signal and the second delay signal, so that a logic processing signal with set pulse width can be output, a driving channel between the driving unit and the laser can be conducted, and the driving unit can drive the laser to emit light, so that the light-emitting stability of the laser can be improved.
In order to better understand the inventive concepts, operating principles and advantages of the embodiments of the present disclosure, the laser driving circuits in the embodiments of the present disclosure are described in detail below.
Referring to a schematic diagram of a laser driving circuit in the embodiment of the present specification shown in fig. 1, in some embodiments of the present specification, as shown in fig. 1, a laser driving circuit 100 may be coupled to a laser LD, where the laser LD may include an edge emitting laser (Edge Emitting Laser, EEL) or a Vertical-cavity surface emitting laser (Vertical-Cavity Surface Emitting Laser, VCSEL), etc., and the embodiment of the present specification is not limited to the type of laser used.
The laser driving circuit 100 may include: delay unit 110, logic processing unit 120, and drive unit 130, wherein:
the delay unit 110 may include a first delay module 111 and a second delay module 112, where the first delay module 111 is adapted to delay an input square wave signal to obtain a first delay signal Ds1; the second delay module 112 is adapted to delay the input square wave signal to obtain a second delay signal Ds2, where delay time lengths of the first delay module 111 and the second delay module 112 may be different;
The logic processing unit 120 is adapted to generate a logic processing signal Ls for turning on a driving path between the driving unit 130 and the laser LD according to the first delay signal Ds1 and the second delay signal Ds 2;
the driving unit 130 is adapted to drive the laser LD to emit light when the driving path is turned on.
Referring to fig. 1, the first delay module 111 may perform delay processing on the square wave signal to obtain a first delay signal Ds1 with a first delay duration, and output the first delay signal Ds1 to the logic processing unit 120 coupled to the first delay signal Ds; the second delay module 112 may perform delay processing on the square wave signal to obtain a second delay signal Ds2 with a second delay duration, and output the second delay signal Ds2 to the logic processing unit 120 coupled thereto. Since the delay time periods of the first delay module 111 and the second delay module 112 may be different, that is, the first delay time period and the second delay time period may be different, the delay unit 110 may output the first delay signal Ds1 and the second delay signal Ds2 to the logic processing unit 120 at different times.
The logic processing unit 120 may perform a logic and process on the obtained first delay signal Ds1 and second delay signal Ds2, and generate a logic processing signal Ls for turning on a driving path between the driving unit 130 and the laser LD when the first delay signal Ds1 and the second delay signal Ds2 are both in a high level state, so that the driving unit 130 may drive the laser LD to emit light.
Because the first delay signal Ds1 and the second delay signal Ds2 have different delay time lengths, the logic processing unit 120 can acquire the first delay signal Ds1 and the second delay signal Ds2 at different time, and through performing logic processing on the first delay signal Ds1 and the second delay signal Ds2, a signal with a set pulse width can be output to conduct a driving channel between the driving unit and the laser, and the driving unit can drive the laser to emit light, so that the stability of the laser to emit light can be improved.
For a better understanding and to be obtained by anyone skilled in the art, the following concepts, solutions, principles and advantages of the embodiments of the present description will be described in detail by way of specific examples with reference to the drawings.
In a specific implementation, as the laser operates, the required voltage or light emitting parameters may change, and thus the parameters (e.g., pulse width and amplitude) of the first delay signal and the second delay signal output to the logic processing unit need to be changed to adapt to the current operating state of the laser, or the driving control requirements for different types of lasers are different.
Based on this, in some embodiments of the present disclosure, referring to fig. 1, referring to a schematic structural diagram of a first delay module in the embodiment of the present disclosure shown in fig. 2, as shown in fig. 2, the first delay module 111 may include:
a first delay sub-module U11, the first end of which is adapted to input the square wave signal;
the second delay sub-module U12 may include a plurality of first gating channels and a first capacitor C1, a first end of each first gating channel may be coupled to a second end of the first delay sub-module U11, a second end of each first gating channel may be coupled to the first end of the first capacitor C1 and the logic processing unit 120, respectively, a control end of each first gating channel is adapted to input a first control signal, and when the first gating channel is gated, the first gating channel outputs a first delay signal having a corresponding delay duration to the logic processing unit 120; the second end of the first capacitor C1 is grounded.
Referring to fig. 1 and 2, the second delay sub-module U12 may include first gating channels a, b, and C, wherein the first gating channels a, b, and C may each be coupled with the first delay sub-module U11, the first capacitor C1, and the logic processing unit 120.
When different first gating channels are gated, the resistance value connected to the circuit can be changed, so that the delay time of the laser driving circuit on the square wave signal can be changed, and a first delay signal with corresponding delay time is output to the logic processing unit.
For example, when the control terminal S of the first gating channel a a When the first control signal is obtained, the first gating channel a is gated, and the resistance corresponding to the first gating channel a can be accessed into the circuit, and at the moment, the delay time length corresponding to the second delay submodule can be T1; when the control terminal S of the first gating channel b b When the first control signal is obtained, the first gating channel b is gated, and the resistance corresponding to the first gating channel b can be accessed into the circuit, and at the moment, the delay time length corresponding to the second delay submodule can be T2; when the control terminal S of the first gating channel c c When the first control signal is obtained, the first gating channel c is gated, and the resistance value corresponding to the first gating channel c can be accessed into the circuit, and at this time, the delay time length corresponding to the second delay submodule may be T3, where T1, T2 and T3 may be the same or different, which is not limited in any way in the embodiment of the present disclosure.
It can be understood that first, in a one-time driving process, a first control signal can be provided to the control ends of the first gating channels a, b and c respectively or simultaneously, so that the resistance values corresponding to the first gating channels a, b and c can be connected to the second delay submodule, and the delay time length corresponding to the second delay submodule can be further changed; secondly, the number of the first gating channels illustrated in fig. 2 is only illustrative, and is used for illustrating that the delay time length of the second delay sub-module can be changed by gating different first gating channels, which cannot be understood as a limitation of the present invention, and the number of the first gating channels can be flexibly set according to actual requirements, and the embodiment of the present invention does not limit the number of the first gating channels; third, the first control signal according to the embodiment of the present specification may refer to an electrical signal having a high or low level, such as a current signal or a voltage signal.
The second delay submodule with the structure can change the size of the resistor connected to the laser driving circuit when the first gating channel is gated, and further can form a delay circuit with corresponding delay time length with the first capacitor when the corresponding first gating channel is gated, so that first delay signals with different delay time lengths can be output to the logic processing unit to obtain logic processing signals with different pulse widths, the output of various selectable pulse width signals is realized, and logic processing signals can be provided for lasers of different types or lasers in different running states.
In a specific implementation, each of the first gate channels may have the same structure.
As an alternative example, the first gating channel may include: the input end of the first transistor is used as the first end of the first gating channel, the output end of the first transistor is used as the second end of the first gating channel, and the control end of the first transistor is used as the control end of the first gating channel.
With continued reference to fig. 2, for example, the first gating channel a may include a first transistor P1, an input terminal of the first transistor P1 may be coupled to the second terminal of the first delay sub-module U11, an output terminal of the first transistor P1 may be coupled to the logic processing unit 120, and a control terminal of the first transistor P1 may be used to access the first control signal.
Accordingly, the first gate channel b may include the first transistor P2, and the first gate channel c may include the first transistor P3, wherein connection relationships between the first transistors P2 and P3 and other devices may refer to the description of the first transistor P1, which will not be described herein.
Since the first transistors P1 to P3 each function as a second delay sub-module for changing the access to the circuit, the first transistors P1 to P3 may be connected in parallel.
Thus, by making the first gate channel include the first transistor, the circuit structure can be simplified while achieving the gate action.
It should be noted that the first strobe channel further includes other components or circuits. For example, the first gate channel may include a GaN power device, a transistor, an IGBT, or the like, and the type of the first gate channel is not particularly limited in the embodiments of the present disclosure.
In a specific implementation, referring next to fig. 2, the first delay submodule U11 may include an inverter Q, through which the square wave signal can be inverted and simultaneously can play a role in delay.
It should be understood that the first delay sub-module U11 may also be other circuits or components with a delay function, which is not limited in this embodiment of the present disclosure.
In the practical application process, considering that the laser driving circuit operates for a long time, the second delay sub-module may generate a fault, for example, the first gating channel a is in a normally closed state, or the first gating channel b cannot be used, so that the driving performance of the laser driving circuit may be affected.
To this end, with continued reference to fig. 2, the second delay sub-module U12 may further include: the first delay resistor R1 may be coupled to the output terminal of each first gate channel, the first terminal of the first capacitor C1, and the logic processing unit 120, respectively.
Specifically, a first end of the first delay resistor R1 may be connected to the output ends of the first gate channels a, b, and C, respectively, and a second end of the first delay resistor R1 may be connected to a first end of the first capacitor C1 and the logic processing unit 120, respectively.
Through setting up first delay resistor, can be when the first strobe channel in the second delay submodule breaks down, first delay resistor can constitute delay circuit with first electric capacity for first delay module still can play the delay effect, improves laser drive circuit's job stabilization nature.
In some embodiments, the second delay module may have a similar structure to the first delay module to output the second delay signal having a corresponding delay duration to the logic processing unit.
As a specific example, referring to fig. 1, referring to a schematic structural diagram of a second delay module of the present specification shown in fig. 3, as shown in fig. 3, the second delay module 112 may include a plurality of second gate channels and a second capacitor C2, wherein:
the first end of each second gating channel is suitable for inputting the square wave signal, the second end of each second gating channel can be respectively coupled with the first end of the second capacitor C2 and the logic processing unit 120, and the control end of each second gating channel is suitable for inputting a second control signal, wherein the second gating channel outputs the second delay signal with corresponding delay time to the logic processing unit 120 when being gated; the second end of the second capacitor C2 is grounded.
Referring to fig. 1 and 3, the second delay module 112 may include second gating channels d, e, and f, wherein the second gating channels d, e, and f may be coupled to the second capacitor C2 and the logic processing unit 120.
When the different second gating channels are gated, the resistance value connected to the second delay module can be changed, so that the delay time length of the square wave signal by the laser driving circuit can be changed, and a second delay signal with corresponding delay time length is output to the logic processing unit.
For example, when the control terminal S of the second gating channel d d When the second control signal is obtained, the second gating channel d is gated, and the resistance corresponding to the second gating channel d can be accessed into the circuit, and at the moment, the delay time corresponding to the second delay module can be T4; when the control terminal S of the second strobe channel e e When the second control signal is acquired, the second gating channel e is gated, and the resistance value corresponding to the second gating channel e can be accessedIn the circuit, the delay time length corresponding to the second delay module at the moment can be T5; when the control terminal S of the second strobe channel f f When the second control signal is obtained, the second gating channel f is gated, and the resistance value corresponding to the second gating channel f can be accessed into the circuit, and at this time, the delay time corresponding to the second delay module may be T6, where T4, T5 and T6 may be the same or different, which is not limited in any way in the embodiment of the present disclosure.
It can be understood that first, in a one-time driving process, a second control signal can be provided to the control ends of the second gating channels d, e and f respectively or simultaneously, so that the resistance values corresponding to the second gating channels d, e and f can be connected to the second delay module, and the delay time length corresponding to the second delay module can be further changed; second, the number of second gating channels illustrated in fig. 3 is only an illustration, which is used to illustrate that the delay time of the circuit can be changed by gating different second gating channels, and is not to be understood as limiting the invention, and the number of second gating channels can be flexibly set according to actual requirements, which is not limited in the embodiment of the present disclosure; third, the second control signal according to the embodiment of the present specification may refer to an electrical signal having a high or low level, such as a current signal or a voltage signal.
The second delay module with the structure can change the size of the resistor connected to the laser driving circuit when the second gating channel is gated, and further can form a delay circuit with corresponding delay time length with the second capacitor when the corresponding second gating channel is gated, so that second delay signals with different delay time lengths can be output to the logic processing unit to obtain logic processing signals with different pulse widths, the output of various selectable pulse width signals is realized, and logic processing signals can be provided for lasers of different types or lasers in different running states.
In a specific implementation, each of the second gate channels may have the same structure.
As an alternative example, the second gating channel may include: and the input end of the second transistor can be used as the first end of the second gating channel, the output end of the second transistor can be used as the second end of the second gating channel, and the control end of the second transistor can be used as the control end of the second gating channel.
With continued reference to fig. 3, for example, the second gating channel d may include a second transistor P4, the second transistor P4 input may input a square wave signal, the second transistor P4 output may be coupled to a logic processing unit, and the second transistor P4 control may be used to access a second control signal.
Accordingly, the second gate path e may include the second transistor P5, and the second gate path f may include the second transistor P6, wherein connection relationships between the second transistors P5 and P6 and other devices may refer to the description of the second transistor P4, which will not be described herein.
Since the second transistors P4 to P6 each function to change the resistance connected to the second delay block, the second transistors P4 to P6 may be connected in parallel.
Thus, by making the second gate channel include the second transistor, the circuit structure can be simplified while achieving the gate action.
It should be noted that the second strobe channel also includes other components or circuits. For example, the second gate channel may include a GaN power device, a transistor, an IGBT, or the like, and the embodiment of the present specification does not particularly limit the type of the second gate channel.
In the practical application process, considering that the laser driving circuit operates for a long time, the second delay module may fail, for example, the second gate channel d is in a normally closed state, or the second gate channel e cannot be used, so that the driving performance of the laser driving circuit may be affected.
To this end, with continued reference to fig. 2, the second delay module 112 may further include: a second delay resistor R2, where the second delay resistor R2 may be coupled to the output terminal of each second gate channel, the first terminal of the second capacitor C2, and the logic processing unit 120, respectively.
Specifically, the first end of the second delay resistor R2 may be connected to the output ends of the second gate channels d, e, and f, respectively, and the second end of the second delay resistor R2 may be connected to the first end of the second capacitor C2 and the logic processing unit 120, respectively.
Through setting up the second delay resistor, can be when the first gating channel in the second delay module breaks down, the second delay resistor can constitute delay circuit with the second electric capacity for the second delay module still can play the delay effect, improves laser drive circuit's job stabilization nature.
In implementations, the first delay signal and the second delay signal may be processed with logic processing units having different execution logic to determine the light emission state of the laser.
As a specific example, referring to fig. 1, referring to a specific structural schematic diagram of a laser driving circuit in the embodiment of the present disclosure shown in fig. 4, as shown in fig. 4, the logic processing unit 120 may include: AND a logic gate AND, a first input terminal of which may be coupled to the first delay block 111, a second input terminal of which may be coupled to the second delay block 112, AND an output terminal of which may be coupled to the driving unit 130, adapted to perform an AND logic process on the first delay signal Ds1 AND the second delay signal Ds2, AND output a corresponding logic processing result as the logic processing signal Ls.
Specifically, the AND logic gate AND may output a logic processing signal Ls for conducting a driving path between the driving unit 130 AND the laser LD according to the acquired levels corresponding to the first delay signal Ds1 AND the second delay signal Ds2, when the first delay signal Ds1 AND the second delay signal Ds2 are both in a high level state, so that the laser LD may emit light; when one of the first delay signal Ds1 and the second delay signal Ds2 is in a low level state, a signal for driving the switching module 122 to be turned off can be output, and thus, a path between the driving unit 130 and the laser LD is turned off, and the laser LD stops emitting light.
Namely: because the first delay signal Ds1 AND the second delay signal Ds2 have time difference, the AND logic gate AND can acquire the first delay signal Ds1 AND the second delay signal Ds2 at different moments, the AND logic gate AND can perform logic AND processing on the first delay signal Ds1 AND the second delay signal Ds2 through the competition relationship between the first delay signal Ds1 AND the second delay signal Ds2, a logic processing signal Ls with specific pulse width AND amplitude (wherein the amplitude is related to the amplitude of the square wave signal) is output, AND the laser can be conducted AND closed regularly, so that the laser LD can emit light according to set light emitting parameters, AND the light emitting stability of the laser is improved.
For example, referring to a waveform diagram of a logic processing signal in the embodiment of the present disclosure shown in fig. 5, the horizontal axis represents time t in ns, and the vertical axis represents voltage amplitude U in V.
Fig. 5 shows waveforms of the first delayed signal Ds1, the second delayed signal Ds2 and the logic processing signal Ls, respectively, and by performing logical and processing on the first delayed signal Ds1 and the second delayed signal Ds2, the logic processing signal Ls having a pulse width of 5.1ns and a value of 5V can be obtained.
With the laser driving circuit in the above embodiment, by logically and-processing the first delay signal and the second delay signal having the time difference, it is possible to generate a logic processing signal having a specific amplitude and pulse width, in response to which the driving unit can supply energy to the laser when the driving path between the driving unit and the laser is turned on.
In some embodiments of the present description, referring next to fig. 1 and 4, the driving unit 130 may include: voltage source VDD, switching module 131, and energy storage module 132, wherein:
the first end of the switch module 131 may be coupled to the voltage source VDD and the energy storage module 132, respectively, the second end thereof may be coupled to the anode of the laser LD, and the control end thereof may be coupled to the output end of the logic processing unit 120, adapted to conduct a driving path between the energy storage module 132 and the laser LD in response to the logic processing signal Ls;
an energy storage module 132 may be coupled to the voltage source VDD and the laser LD, respectively, adapted to store energy provided by the voltage source VDD, and adapted to provide the stored energy to the laser LD via the drive path.
Specifically, when the logic processing signal Ls is in a low level state, the switch module 131 is in an off state, the driving path between the energy storage module 132 and the laser LD is not turned on, and the power supply VDD can supply electric power to the energy storage module 132; when the logic processing signal Ls is in a high level state, the switch module 131 is in a conducting state, the driving path between the energy storage module 132 and the laser LD is conducted, and the energy storage module 131 can provide the stored electric quantity for the laser LD, so that the laser LD can be driven to emit light according to the set light emitting parameters.
In some alternative examples of the present specification, as shown in fig. 4, the energy storage module 132 may include an energy storage capacitor C3, where a first end of the energy storage capacitor C3 may be connected to the switching module 131 and the voltage source VDD, and a second end thereof may be connected to the cathode of the laser LD.
In some embodiments of the present disclosure, with continued reference to fig. 4, the switching module 131 may include a third transistor P7, a control terminal of the third transistor P7 may be connected to an output terminal of the logic gate AND, a first terminal of the third transistor P7 may be connected to the voltage source VDD AND a first terminal of the storage capacitor C3, AND a second terminal of the third transistor P7 may be connected to an anode of the laser LD.
It should be noted that the switch module may be other components or circuits. For example, the switching module may be a GaN power device, a transistor, an IGBT, or the like.
In some embodiments, the energy storage speed of the energy storage module can be adjusted for better control of the light emitting process of the laser.
Based on this, with continued reference to fig. 4, the driving unit 130 may further include: the energy storage adjusting module 133 is coupled to the voltage source VDD, the energy storage module 132 and the switch module 131, respectively, and is adapted to adjust the energy storage speed of the energy storage module 132.
The luminous process of the laser can be adjusted by adjusting the energy storage speed of the energy storage module so as to adapt to different requirements.
In some embodiments, the energy storage adjustment module 133 may include an adjustment resistor R3, wherein a first end of the adjustment resistor R3 may be connected to the voltage source VDD, and a second end thereof may be connected to the switching module 131 and the energy storage module 132.
Specifically, when charging the energy storage module 132, the corresponding charging current I 1 The method comprises the following steps: i 1 =U VDD /R R3 Wherein U is VDD Characterization of the voltage value provided by the voltage source VDD, R R3 The resistance of the regulating resistor R3 is characterized.
When the energy storage module 132 discharges to the laser LD, the corresponding discharge current I 2 The method can be as follows: i 2 =U VDD /R P7 Wherein U is VDD Characterization of the voltage value provided by the voltage source VDD, R P7 The resistance of the third transistor P7 is characterized.
In some embodiments, the resistance of the adjustment resistor R3 is adjustable.
In the process of discharging the energy storage adjusting module to the laser, the voltage value acquired by the laser can be large, and the possibility of burning the laser exists.
To avoid the occurrence of the above, with continued reference to fig. 4, the laser driving circuit 100 may further include: and a clamping unit 140, wherein the clamping unit 140 may be coupled to the driving unit 130 and the laser LD, respectively, and adapted to limit a voltage amplitude provided by the driving unit 130 to the laser LD, so as to ensure that the laser works in a safe voltage, and further improve the stability of the laser light emission.
In some embodiments, with continued reference to fig. 4, the clamping unit 140 may include: a clamping diode D1 and a clamping resistor R4, wherein a first end of the clamping diode D1 may be connected to the switching module 131, the energy storage module 132, and the energy storage adjusting module 133, respectively, a second end of the clamping diode D1 may be coupled to a first end of the clamping resistor R4, and the clamping resistor R4 may be grounded.
It should be noted that while the embodiments of the present disclosure have been described above in terms of various embodiments, the various alternatives identified by the various embodiments can be combined with each other and cross-referenced without conflict, thereby extending what is believed to be the disclosed, disclosed embodiments.
In order to better understand and implement the specific operation principle of the laser driving circuit provided in the embodiments of the present specification, the following details are given by specific examples with reference to the accompanying drawings.
Referring to fig. 6, which is a schematic diagram showing a specific structure of a laser driving circuit in the embodiment of the present disclosure, the specific structure of each unit in the laser driving circuit may be referred to as the foregoing example, which is not described herein in detail, and the connection relationship of the laser driving circuit is:
A first terminal of the inverter Q may be connected to input terminals of the second transistors P4 to P6, and a second terminal of the inverter Q may be connected to input terminals of the first transistors P1 to P3; the output ends of the first transistors P1 to P3 may be connected to the first end of the first delay resistor R1, and the control ends of the first transistors P1 to P3 may input a first control signal; the second end of the first delay resistor R1 may be connected to the first end of the first capacitor C1 AND to the first input end of the logic gate AND, respectively; the first end of the first capacitor C1 may be grounded.
The output ends of the second transistors P4 to P6 may be connected to the first end of the second delay resistor R2, and the control ends of the second transistors P4 to P63 may input a second control signal; the second end of the second delay resistor R2 can be respectively connected with the first end of the second capacitor C1 and the second input end of the logic gate; the second terminal of the second capacitor C1 may be grounded.
The output terminal of the AND logic gate AND may be connected to the control terminal of the third transistor P7, the first terminal of the third transistor P7 may be connected to the first terminal of the clamp diode D1, the second terminal of the adjusting resistor R3, AND the first terminal of the storage capacitor C3, respectively, AND the second terminal of the third transistor P7 may be connected to the second terminal of the clamp resistor R4, AND the anode of the laser LD, respectively.
The second end of the clamping diode D1 can be connected with the first end of the adjusting resistor R3; a second terminal of the storage capacitor C3 may be connected to the cathode of the laser LD.
The working principle of the laser driving circuit is as follows:
when the first end of the inverter Q acquires a square wave signal, the square wave signal can be subjected to inversion processing and delayed, the resistor connected into the circuit can be changed by providing a first control signal for the control end of at least one first transistor of the first transistors P1 to P3, and then the first transistor in a gating state, the first delay resistor R1 and the first capacitor C1 form an RC delay circuit, so that a first delay signal with a first delay time length can be output to the first input end of the AND logic gate.
By providing the second control signal to the control terminal of at least one of the second transistors P4 to P6, the resistance connected to the circuit can be changed, and the second transistor, the second delay resistor R2 and the second capacitor C2 in the gating state form an RC delay circuit, so that the second delay signal with the second delay duration can be output to the first input terminal of the and logic gate.
Since there is a time difference between the first delay signal AND the second delay signal, the AND logic gate AND can obtain the first delay signal AND the second delay signal at different time, AND by performing logic AND processing on the first delay signal AND the second delay signal, a logic processing signal with a specific amplitude AND a specific pulse width can be output (see fig. 5 in particular), where the logic processing signal is used to make the third transistor P7 conductive, AND further the energy storage capacitor C3 can discharge to the laser LD through the third transistor P7, AND the laser LD can emit light, where the energy stored in the energy storage capacitor C3 is obtained by charging the energy storage capacitor C3 through the adjusting resistor R3 by the voltage source VDD when the third transistor P7 is not conductive.
During the process of discharging the energy storage capacitor C3 to the laser LD through the third transistor P7, the clamping diode D1 and the clamping resistor R4 can limit the voltage amplitude provided by the energy storage capacitor C3 to the laser LD.
The embodiments of the present disclosure further provide an electronic device corresponding to the laser driving circuit described in any of the above embodiments, and the detailed description will be made with reference to the accompanying drawings by way of specific embodiments.
Referring to fig. 7, which is a schematic structural diagram of an electronic device in the embodiment of the present disclosure, in some embodiments of the present disclosure, the electronic device 200 may include the laser driving circuit 100 according to any one of the embodiments described above and a laser LD connected to the laser driving circuit 100, where:
the laser driving circuit 100 is adapted to provide a driving voltage for the laser LD;
the laser LD is adapted to emit light under the action of the driving voltage.
The specific contents of the structure, connection, function, operation principle, etc. of the laser driving circuit 100 may refer to the descriptions and the drawings of the above related parts, and are not repeated herein.
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 (13)

1. A laser driver circuit coupled to a laser, the laser driver circuit comprising: the device comprises a delay unit, a logic processing unit and a driving unit, wherein:
the delay unit comprises a first delay module and a second delay module, wherein the first delay module is suitable for carrying out delay processing on an input square wave signal to obtain a first delay signal; the second delay module is suitable for carrying out delay processing on the input square wave signals to obtain second delay signals, wherein delay time lengths of the first delay module and the second delay module are different;
the logic processing unit is suitable for generating logic processing signals for conducting a driving channel between the driving unit and the laser according to the first delay signal and the second delay signal;
the driving unit is suitable for driving the laser to emit light when the driving channel is conducted.
2. The laser driver circuit of claim 1, wherein the first delay module comprises:
a first delay sub-module, the first end of which is suitable for inputting the square wave signal;
The second delay submodule comprises a plurality of first gating channels and first capacitors, wherein the first ends of the first gating channels are coupled with the second ends of the first delay submodules, the second ends of the first gating channels are respectively coupled with the first ends of the first capacitors and the logic processing unit, the control ends of the first gating channels are suitable for inputting first control signals, and when the first gating channels are gated, the first gating channels output first delay signals with corresponding delay time lengths to the logic processing unit; the second end of the first capacitor is grounded.
3. The laser driver circuit of claim 2, wherein the first delay submodule includes an inverter.
4. The laser driver circuit of claim 2, wherein the first gating channel comprises:
the input end of the first transistor is used as the first end of the first gating channel, the output end of the first transistor is used as the second end of the first gating channel, and the control end of the first transistor is used as the control end of the first gating channel.
5. The laser driver circuit of any of claims 2-4, wherein the second delay sub-module further comprises:
The first delay resistor is respectively coupled with the output end of each first gating channel, the first end of the first capacitor and the logic processing unit.
6. The laser driver circuit of claim 1, wherein the second delay module comprises:
the first end of each second gating channel is suitable for inputting the square wave signal, the second end of each second gating channel is respectively coupled with the first end of each second capacitor and the logic processing unit, the control end of each second gating channel is suitable for inputting a second control signal, and the second gating channel outputs the second delay signal with corresponding delay time to the logic processing unit when being gated; the second end of the second capacitor is grounded.
7. The laser driver circuit of claim 6, wherein the second gating channel comprises:
and the input end of the second transistor is used as the first end of the second gating channel, the output end of the second transistor is used as the second end of the second gating channel, and the control end of the second transistor is used as the control end of the second gating channel.
8. The laser driver circuit of claim 6 or 7, wherein the second delay module further comprises:
and the second delay resistors are respectively coupled with the output end of each second gating channel, the first end of the second capacitor and the logic processing unit.
9. The laser driver circuit of claim 1, wherein the logic processing unit comprises: and the first input end of the logic gate is coupled with the first delay module, the second input end of the logic gate is coupled with the second delay module, the output end of the logic gate is coupled with the driving unit, and the logic gate is suitable for performing AND logic processing on the first delay signal and the second delay signal and outputting corresponding logic processing results to serve as the logic processing signals.
10. The laser driving circuit according to claim 1, wherein the driving unit comprises: voltage source, switch module and energy storage module, wherein:
the first end of the switch module is respectively coupled with the voltage source and the energy storage module, the second end of the switch module is coupled with the anode of the laser, and the control end of the switch module is coupled with the output end of the logic processing unit and is suitable for responding to the logic processing signal to conduct a driving channel between the energy storage module and the laser;
An energy storage module coupled to the voltage source and the laser, respectively, adapted to store energy provided by the voltage source, and adapted to provide the stored energy to the laser when a drive path between the energy storage module and the laser is turned on.
11. The laser driver circuit of claim 10, wherein the driver unit further comprises:
and the energy storage adjusting module is respectively coupled with the voltage source, the energy storage module and the switch module and is suitable for adjusting the energy storage speed of the energy storage module.
12. The laser driver circuit of claim 1, further comprising:
and the clamping unit is coupled with the driving unit and the laser respectively and is suitable for limiting the voltage amplitude provided by the driving unit for the laser.
13. An electronic device comprising a laser driving circuit according to any of claims 1-12, and a laser connected to the laser driving circuit.
CN202311549701.6A 2023-11-21 2023-11-21 Laser driving circuit and electronic equipment Pending CN117293653A (en)

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