CN112332213A - Laser driving circuit with human eye protection function and method thereof - Google Patents
Laser driving circuit with human eye protection function and method thereof Download PDFInfo
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- CN112332213A CN112332213A CN202110000822.XA CN202110000822A CN112332213A CN 112332213 A CN112332213 A CN 112332213A CN 202110000822 A CN202110000822 A CN 202110000822A CN 112332213 A CN112332213 A CN 112332213A
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- 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
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
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Abstract
The invention provides a laser driving circuit with a human eye protection function, which is characterized by comprising: the device comprises a laser, a pulse end, a pulse width configuration unit, a driving module, a current configuration unit and a pulse signal monitoring unit. The pulse width configuration unit receives the input signal and configures a first pulse signal and a second pulse signal, the first pulse signal and the second pulse signal have different time delays, the driving module receives and processes the pulse signals and then transmits the processed pulse signals to the laser to drive the laser to generate the optical signals, the current configuration unit switches currents with different magnitudes, and the pulse signal monitoring unit is used for monitoring the average value of the pulse signals; the pulse signal monitoring unit adjusts the pulse width and the current of the pulse signal according to the pulse signal, the first control signal and the second control signal until the optical power of the optical signal meets the human eye safety standard.
Description
Technical Field
The invention relates to a laser driving circuit and a method thereof, in particular to a laser driving circuit with a human eye protection function and a method thereof.
Background
In many fields, the distance to the target cannot be measured by actual contact, and common non-contact distance measurement options include ultrasonic waves, millimeter waves, and lasers. The laser radar is a radar device for detecting the position, speed and other characteristic quantities of a target by emitting laser beams, and the working principle of the laser radar is to emit the laser beams to the target, then compare the received target echo reflected from the target with an emitted signal, and after proper processing, the distance of the target can be obtained.
Laser radar ranging based on Time-of-Flight (TOF) ranging is more and more commonly applied to the field of machine vision and the like, and a photon Time-of-Flight ranging technology is a technology for realizing accurate ranging by measuring the round-trip Flight Time of light pulses between a transmitting/receiving device and a target object and is applied to a DTOF technology.
The pulse laser driving circuit commonly used at present does not consider the injury to human body caused by the failure or misoperation of the pulse laser. As the emitting end of the laser ranging system, the emitter of the laser ranging system is narrow in pulse, the width of the pulse is several ns to tens of ns, and the peak power of the pulse is several hundreds of mW to 70W or more. For the human eye, the accumulated thermal effects of higher peak power lasers, irradiation in continuous mode or wider pulses can cause damage, and the pulsed mode and lower duty cycle are acceptable for the human eye. In order to prevent the optical power from being too high, which is harmful to human eyes, the working state of the laser needs to be monitored. Driving the photodiode requires a drive circuit so that the photodiode emits laser light of a specific frequency, duty cycle, and power.
In view of the above, the present invention provides a laser driving circuit with eye protection function and a method thereof, which are used for driving a laser, and monitoring an electrical pulse signal to prevent the laser from damaging the eyes due to an excessive power of the laser by adjusting the width of the electrical pulse signal.
Disclosure of Invention
The invention aims to monitor the working state of a laser, and is used for solving the technical defect that the human eye is adversely affected due to the fact that the output power of the laser is too high.
In a first aspect, the present invention provides a laser driving circuit having a human eye protection function, comprising: the device comprises a laser, a pulse end, a pulse width configuration unit, a driving module, a current configuration unit and a pulse signal monitoring unit. A laser for generating an optical signal; a pulse terminal from which an input signal is input; the pulse width configuration unit is connected with the pulse end, receives the input signal and configures a first pulse signal and a second pulse signal, the first pulse signal has a first pulse width, the second pulse signal has a second pulse width, the first pulse width is different from the second pulse width, and the first pulse signal and the second pulse signal have different delays; the driving module is connected between the laser and the pulse width configuration unit, receives and processes the first pulse signal and the second pulse signal, transmits the first pulse signal and the second pulse signal to the laser, and drives the laser to generate the optical signal; one end of the current configuration unit is connected with the driving module, and the other end of the current configuration unit is grounded and is used for switching currents with different magnitudes; the pulse signal monitoring unit is connected with an output end of the driving module and the laser, receives the electric signal output by the driving module from the output end, and is used for monitoring the average value of the first pulse signal and the second pulse signal; the pulse signal monitoring unit adjusts the pulse widths and the currents of the first pulse signal and the second pulse signal according to the first pulse signal and the second pulse signal, the first control signal and the second control signal until the optical power of the optical signal meets the eye safety standard.
Further, the driving module further comprises a level shift unit connected with the pulse width configuration unit; the pre-driving unit is connected with the level shifting unit and is used for driving the laser driving circuit; and the number of the first and second groups,
the main driving unit is connected with the pre-driving unit, the current configuration unit, the pulse signal monitoring unit and the laser, the current configuration unit provides the current for the main driving unit, and the main driving unit drives the laser.
Further, the level shift unit is configured to boost the first pulse signal and the second pulse signal to a high level to become a high level pulse signal.
The pulse signal monitoring unit further comprises a first reference generating unit, a second reference generating unit and a pulse signal generating unit, wherein the first reference generating unit is connected with the main driving unit and the laser and is used for generating a first reference voltage; a second reference generating unit for generating a second reference voltage; the filter unit is connected with the main driving unit and the laser, receives the first pulse signal and the second pulse signal output by the main driving unit and outputs a direct current level signal; a first comparing unit having a first input node and a second input node, the first input node being connected to the filtering unit, the second input node being connected to the first reference generating unit, the dc level signal being input from the first input node to the first comparing unit, the first reference voltage being input from the second input node to the first comparing unit, the first comparing unit comparing the first reference voltage and the dc level signal to generate a first comparison signal; a second comparing unit having a third input node and a fourth input node, the third input node being connected to the main driving unit and the laser, the fourth input node being connected to the second reference generating unit, a bottom of the first pulse signal and the second pulse signal being input from the third input node to the second comparing unit, the second reference voltage being input from the fourth input node to the second comparing unit, the second comparing unit comparing the bottom of the first pulse signal and the second pulse signal with the second reference voltage to generate a second comparison signal; the judgment logic unit is connected with the first comparison unit and the second comparison unit and receives the first comparison signal and the second comparison signal; the judgment logic unit adjusts the pulse widths and the currents of the first pulse signal and the second pulse signal according to the first comparison signal and the second comparison signal through the first control signal and the second control signal until the optical power of the optical signal meets the eye safety standard.
Further, wherein the first input node is a positive input node and the second input node is a negative input node.
Further, wherein the third input node is a positive input node and the fourth input node is a negative input node.
In a second aspect, a laser driving method with eye protection function is provided, which is applied to the laser driving circuit according to the first aspect, and is characterized by comprising: starting the pulse signal monitoring unit to preset the pulse widths of the first pulse signal and the second pulse signal and the current of the current configuration unit; the first pulse signal and the second pulse signal pass through the filtering unit to output the direct current level signal; setting the first reference generation unit and the second reference generation unit to generate the first reference voltage and the second reference voltage; inputting the first reference voltage and the DC level signal into the first comparing unit; inputting the second reference voltage, the first pulse signal and the second pulse signal to the second comparing unit; and the pulse signal monitoring unit monitors the first comparison signal of the first comparison unit and the second comparison signal of the second comparison unit in real time to judge and adjust the pulse width and the current.
Further, when the laser driving circuit receives an enable signal, the pulse signal monitoring unit starts to operate.
Further, the filtering unit is a low-pass filtering unit, the first pulse signal and the second pulse signal pass through the filtering unit to obtain a dc level signal of the first pulse signal and the second pulse signal, and when the first pulse signal and the second pulse signal are valley values, the second comparing unit is turned on.
Further, the first comparison signal and the second comparison signal are input into the judgment logic unit, and the judgment logic unit adjusts the pulse width and the current according to the first control signal and the second control signal, so that the optical power of the optical signal meets the eye safety standard.
According to the technical scheme, the pulse signal monitoring unit is arranged to monitor the electric pulse signal, the output signal of the driver is compared with the reference signal through the comparator, when the output signal deviates from the reference signal, the fact that the laser works under the condition that human eyes are harmful can be known, the working state of the laser is monitored, and real-time adjustment is conducted.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a laser driving circuit with eye protection according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for driving a laser with eye protection function according to an embodiment of the present invention.
Description of the symbols
1-a laser drive circuit;
102-a pulse width configuration unit;
104-a drive module;
1040-level shifting unit;
1042 — a pre-drive unit;
1044 — a primary drive unit;
106-a current configuration unit;
108-a pulse signal monitoring unit;
CA-a first comparing unit;
CB-a second comparison unit;
DL-judging logic unit;
DD 1-laser;
an FT-filter unit;
i-current;
n1 — first input node;
n 2-second input node;
n 3-third input node;
n 4-fourth input node;
a PI-pulse end;
PL-optical power;
RG1 — first reference generating unit;
RG2 — second reference generating unit;
s1 — first comparison signal;
s2 — a second comparison signal;
sc1 — first control signal;
sc 2-second control signal;
an SL-optical signal;
se-electric signal;
sen-enable signal;
si-input signal;
sp1 — first pulse signal;
sp2 — a second pulse signal;
pw-pulse width;
pw1 — first pulse width;
pw2 — second pulse width;
v1 — first reference voltage;
v2 — second reference voltage;
s100, S102, S104, S106, S108, S110-method.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description herein, references to the terms "one embodiment" or "another embodiment" mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1, a schematic diagram of a laser driving circuit with eye protection function according to an embodiment of the invention is provided. In fig. 1, a laser driving circuit 1 with eye protection function includes: a laser DD1, a pulse end PI, a pulse width configuration unit 102, a driving module 104, a current configuration unit 106, and a pulse signal monitoring unit 108. Laser DD1 is used to generate an optical signal SL. An input signal Si is input from the pulse terminal PI. The pulse width configuration unit 102 is connected to the pulse end PI, and the pulse width configuration unit 102 receives the input signal Si and configures a first pulse signal Sp1 and a second pulse signal Sp 2. The first pulse signal Sp1 has a first pulse width pw 1. The second pulse signal Sp2 has a second pulse width pw 2. The first pulse width pw1 is different from the second pulse width pw 2. The first pulse signal Sp1 and the second pulse signal Sp2 have different delays.
The driving module 104 is connected between the laser DD1 and the pulse width configuration unit 102. The driving module 104 receives and processes the pulse signal Sp, and transmits the pulse signal Sp to the laser DD1, so as to drive the laser DD1 to generate the optical signal SL.
The current configuration unit 106 has one end connected to the driving module 104 and the other end grounded. The current configuration unit 106 is used for switching a current I with different magnitudes.
The pulse signal monitoring unit 108 is connected to an output terminal of the driving module 104 and the laser DD1, and the pulse signal monitoring unit 108 receives an electrical signal Se output from the output terminal of the driving module 104. The pulse signal monitoring unit 108 is configured to monitor an average value of the pulse signal Sp. The pulse signal monitoring unit 108 adjusts the pulse width pw and the current I of the pulse signal Sp according to the pulse signal Sp, the first control signal Sc1 and the second control signal Sc2 until the optical power PL of the optical signal SL meets the safety standards of human eyes.
As shown in fig. 1, the driving module 104 includes a level shift unit 1040, a pre-driving unit 1042, and a main driving unit 1044. The level shift unit 1040 is connected to the pulse width configuration unit 102. The level shifter 1040 boosts the first pulse signal Sp1 and the second pulse signal Sp2 to a high level to become a high level pulse signal.
The pre-driving unit 1042 is connected to the level shifting unit 1040. The pre-driving unit 1042 is used to drive the laser driving circuit 1. The main drive unit 1044 is connected to the pre-drive unit 1042, the current configuration unit 106, the pulse signal monitoring unit 108 and the laser DD 1. The current configuration unit 106 provides the current I to the main driving unit 1044, and the main driving unit 1044 drives the laser DD 1.
The pulse signal monitoring unit 108 includes a first reference generating unit RG1, a second reference generating unit RG2, a filtering unit FT, a first comparing unit CA, a second comparing unit CB, and a determination logic unit DL, as shown in fig. 1.
The first reference generating unit RG1 is connected to the main driving unit 1044 and the laser DD 1. The first reference generating unit RG1 is used to generate a first reference voltage V1. The second reference generating unit RG2 is configured to generate a second reference voltage V2. The filter unit FT is connected to the main drive unit 1044 and the laser DD 1. The filtering unit FT receives the pulse signal Sp output by the main driving unit 1044 and outputs a dc level signal Sdc.
The first comparing unit CA has a first input node n1 and a second input node n 2. The first input node n1 is connected to a filter unit FT. The second input node n2 is connected to the first reference generating unit RG 1. In this embodiment, the first input node n1 is a positive input node, and the second input node n2 is a negative input node.
The dc level signal Sdc is input to the first comparison unit CA from the first input node n 1. The first reference voltage V1 is input from the second input node n2 to the first comparing unit CA, which compares the first reference voltage V1 with the dc level signal Sdc and generates a first comparison signal S1.
The second comparing unit CB has a third input node n3 and a fourth input node n 4. It should be noted that the third input node n3 is a positive input node, and the fourth input node n4 is a negative input. Node third input node n3 connects the main drive unit 1044 with laser DD 1. The fourth input node n4 is connected to the second reference generating unit RG 2. The valley value of the pulse signal Sp is inputted to the second comparing unit CB from the third input node n3, and the second reference voltage V2 is inputted to the second comparing unit CB from the fourth input node n 4. The second comparing unit CB compares the valley of the pulse signal Sp with the second reference voltage V2 and generates a second comparison signal S2.
The judgment logic unit DL is connected to the first comparing unit CA and the second comparing unit CB. The determination logic unit DL receives the first comparison signal S1 and the second comparison signal S2. The determination logic unit DL adjusts the pulse width pw and the current I of the pulse signal Sp according to the first comparison signal S1 and the second comparison signal S2 via the first control signal Sc1 and the second control signal Sc2 until the optical power PL of the optical signal SL emitted by the laser DD1 meets the eye safety standard.
Referring to fig. 2, a flow chart of a method for driving a laser with eye protection function according to another embodiment of the invention is provided. In fig. 2, a driving method of a laser with eye protection function is applied to the laser driving circuit 1 shown in fig. 1, and the driving method includes:
s100, the pulse signal monitoring unit 108 is activated to preset the pulse width pw of the set pulse signal Sp and the current I of the current configuration unit 106.
S102, passing the pulse signal Sp through a filtering unit FT, and outputting a direct-current level signal Sdc by the filtering unit FT;
s104, setting a first reference generating unit RG1 and a second reference generating unit RG2 to generate a first reference voltage V1 and a second reference voltage V2;
s106, inputting the first reference voltage V1 and the dc level signal Sdc into the first comparing unit CA;
s108, inputting the second reference voltage V2 and the bottom value of the pulse signal Sp into a second comparison unit CB; when the laser driving circuit 1 receives an enable signal Sen, the pulse signal monitoring unit 108 starts operating. And the number of the first and second groups,
s110, inputting a first comparison signal S1 and a second comparison signal S2 into a judgment logic unit DL, and adjusting a pulse width pw and a current I by the judgment logic unit DL according to a first control signal Sc1 and a second control signal Sc2 to make the optical power PL of the optical signal SL of the laser DD1 conform to the safety standard of human eyes. The pulse signal monitoring unit 108 monitors the first comparison signal S1 of the first comparison unit CA and the second comparison signal S2 of the second comparison unit CB in real time for determining, and adjusts the pulse width pw and the current I of the pulse signal Sp.
The filtering unit FT is a low-pass filtering unit, the pulse signal Sp passes through the filtering unit FT, and the filtering unit FT generates a dc level signal Sdc of the pulse signal Sp. When the pulse signal Sp is at the bottom, the second comparing unit CB is turned on.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A laser driver circuit with eye protection, comprising:
a laser for generating an optical signal;
a pulse terminal from which an input signal is input;
the pulse width configuration unit is connected with the pulse end, receives the input signal and configures a first pulse signal and a second pulse signal, the first pulse signal has a first pulse width, the second pulse signal has a second pulse width, the first pulse width is different from the second pulse width, and the first pulse signal and the second pulse signal have different delays;
the driving module is connected between the laser and the pulse width configuration unit, receives and processes the first pulse signal and the second pulse signal, transmits the first pulse signal and the second pulse signal to the laser, and drives the laser to generate the optical signal;
one end of the current configuration unit is connected with the driving module, and the other end of the current configuration unit is grounded and is used for switching currents with different magnitudes; and the number of the first and second groups,
the pulse signal monitoring unit is connected with the output end of the driving module and the laser, receives the electric signal output by the driving module from the output end, and is used for monitoring the average value of the first pulse signal and the second pulse signal;
the pulse signal monitoring unit adjusts the pulse widths and the currents of the first pulse signal and the second pulse signal according to the first pulse signal and the second pulse signal, the first control signal and the second control signal until the optical power of the optical signal meets the eye safety standard.
2. The laser driver circuit with eye protection as claimed in claim 1, wherein the driving module further comprises:
the level shift unit is connected with the pulse width configuration unit;
the pre-driving unit is connected with the level shifting unit and is used for driving the laser driving circuit; and the number of the first and second groups,
the main driving unit is connected with the pre-driving unit, the current configuration unit, the pulse signal monitoring unit and the laser, the current configuration unit provides the current for the main driving unit, and the main driving unit drives the laser.
3. The laser driving circuit with eye protection as claimed in claim 2, wherein the level shifting unit is configured to boost the first pulse signal and the second pulse signal to a high level to become a high level pulse signal.
4. The laser driver circuit with eye protection as claimed in claim 2, wherein said pulse signal monitoring unit further comprises:
the first reference generation unit is connected with the main driving unit and the laser and used for generating a first reference voltage;
a second reference generating unit for generating a second reference voltage;
the filtering unit is connected with the main driving unit and the laser, receives the pulse signal output by the main driving unit and outputs a direct current level signal;
a first comparing unit having a first input node and a second input node, the first input node being connected to the filtering unit, the second input node being connected to the first reference generating unit, the dc level signal being input from the first input node to the first comparing unit, the first reference voltage being input from the second input node to the first comparing unit, the first comparing unit comparing the first reference voltage and the dc level signal to generate a first comparison signal;
a second comparing unit having a third input node and a fourth input node, the third input node being connected to the main driving unit and the laser, the fourth input node being connected to the second reference generating unit, a bottom of the pulse signal being input from the third input node to the second comparing unit, the second reference voltage being input from the fourth input node to the second comparing unit, the second comparing unit comparing the bottom of the pulse signal with the second reference voltage to generate a second comparison signal; and the number of the first and second groups,
the judgment logic unit is connected with the first comparison unit and the second comparison unit and receives the first comparison signal and the second comparison signal;
the judgment logic unit adjusts the pulse widths and the currents of the first pulse signal and the second pulse signal according to the first comparison signal and the second comparison signal and through the first control signal and the second control signal until the optical power of the optical signal meets the eye safety standard.
5. The laser driver circuit with eye protection as claimed in claim 4, wherein the first input node is a positive input node and the second input node is a negative input node.
6. The laser driver circuit with eye protection as claimed in claim 4, wherein the third input node is a positive input node and the fourth input node is a negative input node.
7. A laser driving method with eye protection function, applied to the laser driving circuit of any one of claims 1 to 6, comprising:
starting the pulse signal monitoring unit to preset the pulse width of the pulse signal and the current of the current configuration unit;
the first pulse signal and the second pulse signal pass through the filtering unit to output a direct current level signal;
setting the first reference generation unit and the second reference generation unit to generate the first reference voltage and the second reference voltage;
inputting the first reference voltage and the DC level signal into the first comparing unit;
inputting the second reference voltage and the valley value of the pulse signal to the second comparing unit; and the number of the first and second groups,
the pulse signal monitoring unit monitors the first comparison signal of the first comparison unit and the second comparison signal of the second comparison unit in real time to judge, and adjusts the pulse width and the current.
8. The method for driving a laser with eye protection as claimed in claim 7, wherein said pulse signal monitoring unit starts operating when said laser driving circuit receives an enable signal.
9. The method as claimed in claim 7, wherein the filter unit is a low pass filter unit, the first pulse signal and the second pulse signal pass through the filter unit to obtain dc level signals of the first pulse signal and the second pulse signal, and the second comparator is turned on when the first pulse signal and the second pulse signal are at a valley.
10. The method as claimed in claim 7, wherein the first comparison signal and the second comparison signal are inputted into the judgment logic unit, and the judgment logic unit adjusts the pulse width and the current according to the first control signal and the second control signal, so that the optical power of the optical signal meets the eye-safe standard.
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| CN202110000822.XA CN112332213A (en) | 2021-01-04 | 2021-01-04 | Laser driving circuit with human eye protection function and method thereof |
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| US20160079731A1 (en) * | 2014-09-14 | 2016-03-17 | Ncstar, Inc. | Blue Laser Aiming Device |
| CN208806469U (en) * | 2018-09-30 | 2019-04-30 | 北京国科欣翼科技有限公司 | A kind of driving circuit of the laser range finder with feedback function |
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