CN110445011B - Laser power supply constant current driving circuit and method - Google Patents
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Abstract
The invention relates to the technical field of laser driving power supplies, in particular to a constant current driving circuit and method of a laser power supply. The laser power supply constant current driving circuit comprises: the display device comprises a main control circuit, a current protection circuit, a power output circuit, a current feedback regulation circuit, a display circuit, a key circuit, a voltage power supply circuit and an alternating current-to-direct current circuit, wherein the main control circuit is respectively in bidirectional communication connection with the current protection circuit and the current feedback regulation circuit, and the signal output end of the main control circuit is connected with the signal input end of the display circuit. The invention can prevent the damage of the device, and the output stability and the service life of the semiconductor laser can not be influenced by abnormal factors, electromagnetic compatibility problems, conversion efficiency and the like in any working environment, and the invention has higher stability and better reliability.
Description
Technical Field
The invention relates to the technical field of laser driving power supplies, in particular to a constant current driving circuit and method of a laser power supply.
Background
With the progress of the technological level, the application of the constant current source is wider and wider, especially in the field of laser driving power sources. The laser power supply controls the strength and repetition frequency of the laser output of the laser. Due to the special internal structure and working mechanism of the laser, the laser has very high requirements on the working condition and working performance of a power supply of the laser, and particularly has very strict requirements on the stability of an output driving signal; since a slight change of the driving current is likely to cause a change of main parameters of the laser, such as the laser output wavelength and the output optical power, and even cause damage to the laser if the parameter fluctuation is too large.
In the prior art, a common power supply is generally used for driving a laser, so that permanent damage to a device can be caused, and any abnormal factors of working environment, electromagnetic compatibility problems, conversion efficiency and the like directly influence the stability and the service life of the output of the semiconductor laser, so that improvement is urgently needed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a constant current driving circuit and method for a laser power supply, which are used to solve the problems in the prior art that permanent damage to the device may be caused, and that any abnormal factors of the working environment, electromagnetic compatibility problems, conversion efficiency, etc. directly affect the stability and the service life of the output of the semiconductor laser.
In order to achieve the above and other related objects, the present invention provides a constant current driving circuit for a laser power supply, including: a main control circuit, a current protection circuit, a power output circuit, a current feedback regulation circuit, a display circuit, a key circuit, a voltage power supply circuit and an AC-DC conversion circuit, the main control circuit is respectively connected with the current protection circuit and the current feedback regulation circuit in a bidirectional communication way, the signal output end of the main control circuit is connected with the signal input end of the display circuit, the signal input end of the main control circuit is respectively connected with the signal output ends of the key circuit and the voltage power circuit, the current feedback regulating circuit is in bidirectional communication connection with the power output circuit, the signal output end of the current protection circuit is connected with the signal input end of the power output circuit, and the signal output end of the alternating current-to-direct current circuit is respectively connected with the signal input ends of the power output circuit and the voltage power supply circuit.
In an embodiment of the present invention, the main control circuit includes a main control chip, and the model of the main control chip is an STM32F103R8T6 single chip microcomputer.
In an embodiment of the invention, the current protection circuit includes an electronic switch KG1, pin 3 of the electronic switch KG1 is connected to one end of a twenty-third resistor R23 and a power supply, the other end of the twenty-third resistor R23 is connected to a first port of a photocoupler and one end of a twenty-fourth resistor R24, the photocoupler is TLP-1 GB in model, the second port of the photocoupler is grounded, the third port of the photocoupler is connected to the power supply through a second twelfth resistor R22, the fourth port of the photocoupler is connected to a MAX485 chip, pin 4 of the electronic switch KG1 is connected to a collector of a triode, an emitter of the triode is grounded, a base of the triode is connected to the other end of the twenty-fourth resistor R24, pin 5 of the electronic switch KG1 and pin 2 of the electronic switch KG1 are both connected to a digital potentiometer, the model of the digital potentiometer is X9C 102.
In an embodiment of the present invention, the power output circuit includes a first MOS power transistor Q1 and a second MOS power transistor Q2, a drain of the first MOS power transistor Q1 is connected to one end of a protection transistor B1 and a drain of the second MOS power transistor Q2, respectively, a gate of the first MOS power transistor Q1 is connected to one end of a third resistor R3, the other end of the third resistor R3 is connected to one end of a fourth resistor R4, one end of a second surge resistor LY2 and a current feedback regulation circuit, the other end of the second surge resistor LY2 is grounded, a source of the first MOS power transistor Q1 is connected to one end of a tenth resistor R10 and a source of the second MOS power transistor Q2, the other end of the tenth resistor R10 is grounded, a gate of the second MOS power transistor Q2 is connected to the other end of the fourth resistor R4, the other end of the protection transistor B1 is connected to one end of a laser, and the other end of the laser is connected to one end of a first capacitor C1, One end of a second capacitor C2, one end of a third capacitor C3 and a power supply, the other end of the first capacitor C1, the other end of the second capacitor C2 and the other end of the third capacitor C3 are all grounded, and the laser is driven by a laser power supply.
In an embodiment of the invention, the current feedback regulating circuit includes a first operational amplifier and a second operational amplifier, pin 1 of the first operational amplifier is connected to one end of a second sliding rheostat R2 and one end of a sixth sliding rheostat R6 respectively, the other end of the second sliding rheostat R2 is connected to the other end of a third resistor R3, pin 2 of the first operational amplifier is connected to the other end of the sixth sliding rheostat R6 and one end of a seventh resistor R7 respectively, the other end of the seventh resistor R7 is grounded, pin 3 of the first operational amplifier is connected to one end of a first resistor R1 and one end of a first surge resistor LY1 respectively, the other end of the first surge resistor LY1 is grounded, the other end of the first resistor R1 is connected to one end of a fifth resistor R5 and pin 7 of the first operational amplifier respectively, and pin 6 of the first operational amplifier is connected to the other end of the fifth resistor R5 and the other end of the first operational amplifier, One end of an eighth resistor R8, a pin 5 of the first operational amplifier is connected to one end of a ninth resistor R9 and one end of an eleventh resistor R11, the other end of the ninth resistor R9 is connected to one end of a twelfth resistor R12 and a controllable voltage, the other end of the twelfth resistor R12 is connected to the other end of an eleventh resistor R11 and grounded, the other end of the eighth resistor R8 is connected to one end of a fourteenth sliding rheostat R14 and a pin 1 of the second operational amplifier, the other end of the fourteenth sliding rheostat R14 is connected to one end of a fifteenth resistor R15 and a pin 2 of the second operational amplifier, the other end of the fifteenth resistor R15 is grounded, a pin 3 of the second operational amplifier is connected to one end of a sixteenth resistor R16, the other end of the sixteenth resistor R16 is used for sampling the tenth resistor R10, a pin 7 of the second operational amplifier is connected to one end of a thirteenth resistor R13 and a power supply, the other end of the thirteenth resistor R13 is connected with one end of a seventeenth resistor R17 and a pin 6 of a second operational amplifier, the other end of the seventeenth resistor R17 is grounded, a pin 5 of the second operational amplifier is connected with one end of an eighteenth resistor R18 and one end of a nineteenth resistor R19, the other end of the eighteenth resistor R18 is connected with one end of a third surge resistor LY3 and a pulse modulation signal, the other end of the nineteenth resistor R19 is connected with the pulse modulation signal, and the other end of the third surge resistor LY3 is grounded.
In an embodiment of the invention, the display circuit is an OLED liquid crystal display circuit.
In an embodiment of the present invention, the voltage power circuit includes a power conversion chip, and the model of the power conversion chip is an LM78 series chip.
In an embodiment of the present invention, the ac to dc conversion circuit includes a rectifier bridge circuit and a filter circuit.
In an embodiment of the present invention, the first operational amplifier and the second operational amplifier are both model numbers LM 358.
In order to achieve the above object, the present invention further provides a constant current driving method for a laser power supply, wherein the constant current driving method for the laser power supply comprises the steps of:
setting a signal control pin of a main control circuit to be at a low level, outputting a signal to a current protection circuit through the main control circuit, starting a photoelectric coupler of the current protection circuit, and driving an electronic switch to work through a triode amplification circuit, so that a laser power supply works in a preheating protection mode;
when the current output by the power output circuit is stabilized at 3 amperes to 5 amperes, the signal control pin of the main control circuit is set to be at a high level, the photoelectric coupler is closed, the electronic switch is closed, the laser power supply works in a current adjustable mode, and the digital potentiometer is controlled through the main control circuit so as to achieve continuous adjustment of the output current.
As described above, the laser power supply constant current driving circuit and method of the present invention have the following beneficial effects:
the laser power supply constant current driving circuit comprises a main control circuit, a current protection circuit, a power output circuit, a current feedback adjusting circuit, a display circuit, a key circuit, a voltage power supply circuit and an alternating current-to-direct current circuit. The invention can prevent the damage of the device, and the output stability and the service life of the semiconductor laser can not be influenced by abnormal factors, electromagnetic compatibility problems, conversion efficiency and the like in any working environment, and the invention has higher stability and better reliability.
The laser power supply constant current driving circuit compares the actual current value with the set current value, and through the program control of the singlechip and the design of the electronic switch, if the actual current value exceeds the set value, the working state of the laser power supply jumps to the preheating state, thereby playing the role of protecting the semiconductor laser and ensuring higher safety of protecting the semiconductor laser.
The laser power supply constant current driving circuit has the characteristics of small size, high reliability, low cost, high precision and the like, adopts a modular design, and can be used by combining each module with other modules to obtain a constant current source power supply with higher power and more functions, thereby having wider application range.
Drawings
Fig. 1 is a block diagram of a constant current driving circuit of a laser power supply according to an embodiment of the present disclosure.
Fig. 2 is a schematic circuit diagram of a power output circuit of a laser power supply constant current driving circuit according to an embodiment of the present application.
Fig. 3 is a schematic circuit diagram of a current feedback regulating circuit of a laser power supply constant current driving circuit according to an embodiment of the present application.
Fig. 4 is a schematic circuit diagram of a current protection circuit of a laser power supply constant current driving circuit according to an embodiment of the present application.
Fig. 5 is a flowchart of a constant current driving method of a laser power supply according to an embodiment of the present disclosure.
Description of the element reference numerals
10. Master control circuit 20 and current protection circuit
30. Power output circuit 40 and current feedback regulation circuit
50. Display circuit 60 and key circuit
70. Voltage power supply circuit 80 and AC-DC conversion circuit
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the present invention, but not all of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, fig. 1 is a block diagram of a constant current driving circuit of a laser power supply according to an embodiment of the present disclosure. A laser power supply constant current drive circuit comprises: the display device comprises a main control circuit 10, a current protection circuit 20, a power output circuit 30, a current feedback regulation circuit 40, a display circuit 50, a key circuit 60, a voltage power supply circuit 70 and an alternating current-to-direct current circuit 80, wherein the main control circuit 10 is respectively connected with the current protection circuit 20 and the current feedback regulation circuit 40 in a bidirectional communication manner, a signal output end of the main control circuit 10 is connected with a signal input end of the display circuit 50, a signal input end of the main control circuit 10 is respectively connected with signal output ends of the key circuit 60 and the voltage power supply circuit 70, the current feedback regulation circuit 40 is connected with the power output circuit 30 in a bidirectional communication manner, a signal output end of the current protection circuit 20 is connected with a signal input end of the power output circuit 30, and a signal output end of the alternating current-to-direct current circuit 80 is respectively connected with the power output circuit 30, The signal inputs of the voltage supply circuit 70 are connected. Specifically, the laser power supply constant current driving circuit is designed in the following sequence: firstly, a main control circuit 10 and a power output circuit 30 are designed, secondly, a current feedback adjusting circuit 40 is designed, thirdly, a current protection circuit 20 is designed, and finally, a display circuit 50, a key circuit 60, a voltage power supply circuit 70 and an alternating current-direct current converting circuit 80 are designed. The voltage supply circuit 70 is a low voltage supply circuit.
The main control circuit 10 comprises a main control chip, and the model of the main control chip is an STM32F103R8T6 single chip microcomputer. The PC0 pin of the STM32F103R8T6 singlechip can be set to be low level or high level, and the current is output to the triode amplification module of the photoelectric coupler by the Max485 pin. The main control circuit 10 uses an STM32F103R8T6 singlechip module based on an ARM processor to carry out coordination control, and writes algorithm software, so that the design of the power supply has flexibility and expandability.
Specifically, referring to fig. 4, fig. 4 is a schematic circuit diagram of a current protection circuit of a constant current driving circuit of a laser power supply according to an embodiment of the present disclosure. The current protection circuit 20 includes an electronic switch KG1, pin 3 of the electronic switch KG1 is connected to one end of a twenty-third resistor R23 and a power supply, the other end of the twenty-third resistor R23 is connected to a first port of an optocoupler and one end of a twenty-fourth resistor R24, the optocoupler is in a TLP521-1GB model, a second port of the optocoupler is grounded, a third port of the optocoupler is connected to the power supply through a second twelfth resistor R22, a fourth port of the optocoupler is connected to a MAX485 chip, pin 4 of the electronic switch KG1 is connected to a collector of a triode, an emitter of the triode is grounded, a base of the triode is connected to the other end of the twenty-fourth resistor R24, pin 5 of the electronic switch KG1 and pin 2 of the electronic switch KG1 are both connected to a digital potentiometer, and the digital potentiometer is in a X9C102 model. Specifically, the protection of the parallel double-MOS driving module adopts a high-power self-recovery protective tube to realize hardware current protection. The MAX485 chip has stable transmission signal and low price.
Specifically, referring to fig. 2, fig. 2 is a schematic circuit diagram of a power output circuit of a constant current driving circuit of a laser power supply according to an embodiment of the present disclosure. The power output circuit 30 includes a first MOS power transistor Q1 and a second MOS power transistor Q2, the drain of the first MOS power transistor Q1 is connected to one end of a fuse B1 and the drain of the second MOS power transistor Q2, respectively, the gate of the first MOS power transistor Q1 is connected to one end of a third resistor R3, the other end of the third resistor R3 is connected to one end of a fourth resistor R4, one end of a second surge resistor LY2 and the current feedback regulation circuit 40, the other end of the second surge resistor LY2 is grounded, the source of the first MOS power transistor Q1 is connected to one end of a tenth resistor R10 and the source of the second MOS power transistor Q2, the other end of the tenth resistor R10 is grounded, the gate of the second MOS power transistor Q2 is connected to the other end of the fourth resistor R4, the other end of the fuse B1 is connected to one end of a laser, and the other end of the laser is connected to one end of a first capacitor C1, One end of a second capacitor C2, one end of a third capacitor C3 and a power supply, the other end of the first capacitor C1, the other end of the second capacitor C2 and the other end of the third capacitor C3 are all grounded, and the laser is driven by a laser power supply.
The fuse B1 is a high-power self-recovery fuse, and the tenth resistor R10 is a sampling resistor. The power output circuit 30 adopts a method of driving parallel double MOS power tubes to obtain power output.
Specifically, referring to fig. 3, fig. 3 is a schematic circuit diagram of a current feedback regulating circuit of a constant current driving circuit of a laser power supply according to an embodiment of the present disclosure. The current feedback regulating circuit 40 comprises a first operational amplifier and a second operational amplifier, wherein a pin 1 of the first operational amplifier is connected with one end of a second sliding rheostat R2 and one end of a sixth sliding rheostat R6 respectively, the other end of the second sliding rheostat R2 is connected with the other end of a third resistor R3, a pin 2 of the first operational amplifier is connected with the other end of the sixth sliding rheostat R6 and one end of a seventh resistor R7 respectively, the other end of the seventh resistor R7 is grounded, a pin 3 of the first operational amplifier is connected with one end of a first resistor R1 and one end of a first surge resistor LY1 respectively, the other end of the first surge resistor LY1 is grounded, the other end of the first resistor R1 is connected with one end of a fifth resistor R5 and a pin 7 of the first operational amplifier respectively, and a pin 6 of the first operational amplifier is connected with the other end of the fifth resistor R5 and the other end of the first operational amplifier R3 respectively, One end of an eighth resistor R8, a pin 5 of the first operational amplifier is connected to one end of a ninth resistor R9 and one end of an eleventh resistor R11, the other end of the ninth resistor R9 is connected to one end of a twelfth resistor R12 and a controllable voltage, the other end of the twelfth resistor R12 is connected to the other end of an eleventh resistor R11 and grounded, the other end of the eighth resistor R8 is connected to one end of a fourteenth sliding rheostat R14 and a pin 1 of the second operational amplifier, the other end of the fourteenth sliding rheostat R14 is connected to one end of a fifteenth resistor R15 and a pin 2 of the second operational amplifier, the other end of the fifteenth resistor R15 is grounded, a pin 3 of the second operational amplifier is connected to one end of a sixteenth resistor R16, the other end of the sixteenth resistor R16 is used for sampling the tenth resistor R10, a pin 7 of the second operational amplifier is connected to one end of a thirteenth resistor R13 and a power supply, the other end of the thirteenth resistor R13 is connected with one end of a seventeenth resistor R17 and a pin 6 of a second operational amplifier, the other end of the seventeenth resistor R17 is grounded, a pin 5 of the second operational amplifier is connected with one end of an eighteenth resistor R18 and one end of a nineteenth resistor R19, the other end of the eighteenth resistor R18 is connected with one end of a third surge resistor LY3 and a pulse modulation signal, the other end of the nineteenth resistor R19 is connected with the pulse modulation signal, and the other end of the third surge resistor LY3 is grounded.
Specifically, the current feedback adjusting circuit 40 adopts a design method of a three-stage operational amplifier circuit, so that high precision and flexibility of adjustment are realized.
The display circuit 50 is an OLED liquid crystal display circuit. The voltage power supply circuit 70 comprises a power supply conversion chip, wherein the power supply conversion chip is an LM78 series chip, and specifically can be LM7805, LM7808 and LM 7812. The ac to dc circuit 80 includes a rectifier bridge circuit and a filter circuit. The first operational amplifier and the second operational amplifier are both LM 358.
Specifically, please refer to fig. 5, and fig. 5 is a flowchart illustrating a constant current driving method for a laser power supply according to an embodiment of the present disclosure. A constant current driving method of a laser power supply comprises the following steps:
s1, setting a signal control pin of the main control circuit 10 to be at a low level, outputting a signal to the current protection circuit 20 through the main control circuit 10, starting an optical coupler of the current protection circuit 20, and driving an electronic switch to work through a triode amplification circuit, so that the laser power supply works in a preheating protection mode.
S2, when the current output by the power output circuit 30 is stabilized at 3 to 5 amperes, setting the signal control pin of the main control circuit 10 to a high level, turning off the optocoupler, turning off the electronic switch, operating the laser power supply in a current adjustable mode, and controlling the digital potentiometer through the main control circuit 10 to achieve continuous adjustment of the output current.
Specifically, for example, when the current output by the power output circuit 30 is stabilized at 3 amperes, the signal control pin of the main control circuit 10 is set to a high level, the electronic switch is turned off, and the laser power supply operates in the current adjustable mode. When the current output by the power output circuit 30 is stabilized at 4 amperes, the signal control pin of the main control circuit 10 is set to a high level, the electronic switch is turned off, and the laser power supply operates in a current adjustable mode. When the current output by the power output circuit 30 is stabilized at 5 amperes, the signal control pin of the main control circuit 10 is set to a high level, the electronic switch is turned off, and the laser power supply operates in a current adjustable mode.
In summary, the laser power supply constant current driving circuit comprises a main control circuit, a current protection circuit, a power output circuit, a current feedback adjusting circuit, a display circuit, a key circuit, a voltage power supply circuit and an alternating current to direct current circuit, the laser power supply constant current driving circuit realizes continuous change of current of 0 to 15 amperes by carrying out program control through a single chip microcomputer, a sampling resistance feedback system is designed, the current can almost stabilize a required set value in real time, the current is quickly adjusted, and the adjusting precision can reach three ten thousandths. The invention can prevent the damage of the device, and the output stability and the service life of the semiconductor laser can not be influenced by abnormal factors, electromagnetic compatibility problems, conversion efficiency and the like in any working environment, and the invention has higher stability and better reliability.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The constant current driving circuit of the laser power supply is characterized by comprising: the power supply device comprises a main control circuit (10), a current protection circuit (20), a power output circuit (30), a current feedback regulation circuit (40), a display circuit (50), a key circuit (60), a voltage power supply circuit (70) and an alternating current-to-direct current circuit (80), wherein the main control circuit (10) is respectively in bidirectional communication connection with the current protection circuit (20) and the current feedback regulation circuit (40), the signal output end of the main control circuit (10) is connected with the signal input end of the display circuit (50), the signal input end of the main control circuit (10) is respectively connected with the signal output ends of the key circuit (60) and the voltage power supply circuit (70), the current feedback regulation circuit (40) is in bidirectional communication connection with the power output circuit (30), and the signal output end of the current protection circuit (20) is connected with the signal input end of the power output circuit (30), the signal output end of the alternating current-to-direct current circuit (80) is respectively connected with the signal input ends of the power output circuit (30) and the voltage power supply circuit (70);
the master control circuit (10) comprises a master control chip, and the model of the master control chip is an STM32F103R8T6 singlechip;
the current protection circuit (20) comprises an electronic switch KG1, wherein a pin 3 of the electronic switch KG1 is respectively connected with one end of a twenty-third resistor R23 and a power supply, the other end of the twenty-third resistor R23 is respectively connected with the first port of the photoelectric coupler and one end of the twenty-fourth resistor R24, the model of the photoelectric coupler is TLP521-1GB, the second port of the photoelectric coupler is grounded, the third port of the photoelectric coupler is connected with a power supply through a twelfth resistor R22, the fourth port of the photoelectric coupler is connected with a MAX485 chip, pin 4 of the electronic switch KG1 is connected to the collector of the transistor, the emitter of the transistor is grounded, the base electrode of the triode is connected with the other end of the twenty-fourth resistor R24, a pin 5 of the electronic switch KG1 and a pin 2 of the electronic switch KG1 are both connected with a digital potentiometer, and the type of the digital potentiometer is X9C 102;
the power output circuit (30) comprises a first MOS power tube Q1 and a second MOS power tube Q2, wherein the drain of the first MOS power tube Q1 is respectively connected with one end of a fuse tube B1 and the drain of the second MOS power tube Q2, the gate of the first MOS power tube Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with one end of a fourth resistor R4, one end of a second surge resistor LY2 and a current feedback regulation circuit (40), the other end of the second surge resistor LY2 is grounded, the source of the first MOS power tube Q1 is connected with one end of a tenth resistor R10 and the source of the second MOS power tube Q2, the other end of the tenth resistor R10 is grounded, the gate of the second MOS power tube Q2 is connected with the other end of the fourth resistor R4, the other end of the fuse tube B1 is connected with one end of a laser, and the other end of the laser is respectively connected with one end of a first capacitor C1, One end of a second capacitor C2, one end of a third capacitor C3 and a power supply, the other end of the first capacitor C1, the other end of the second capacitor C2 and the other end of the third capacitor C3 are all grounded, and the laser is driven by a laser power supply.
2. The constant current driving circuit of a laser power supply according to claim 1, wherein: the current feedback regulating circuit (40) comprises a first operational amplifier and a second operational amplifier, wherein a pin 1 of the first operational amplifier is respectively connected with one end of a second slide rheostat R2 and one end of a sixth slide rheostat R6, the other end of the second slide rheostat R2 is connected with the other end of a third resistor R3, a pin 2 of the first operational amplifier is respectively connected with the other end of the sixth slide rheostat R6 and one end of a seventh resistor R7, the other end of the seventh resistor R7 is grounded, a pin 3 of the first operational amplifier is respectively connected with one end of a first resistor R1 and one end of a first surge resistor LY1, the other end of the first surge resistor LY1 is grounded, the other end of the first resistor R1 is respectively connected with one end of a fifth resistor R5 and a pin 7 of the first operational amplifier, and a pin 6 of the first operational amplifier is respectively connected with the other ends of the fifth resistor R5 and the fifth operational amplifier R5, One end of an eighth resistor R8, a pin 5 of the first operational amplifier is connected to one end of a ninth resistor R9 and one end of an eleventh resistor R11, the other end of the ninth resistor R9 is connected to one end of a twelfth resistor R12 and a controllable voltage, the other end of the twelfth resistor R12 is connected to the other end of an eleventh resistor R11 and grounded, the other end of the eighth resistor R8 is connected to one end of a fourteenth sliding rheostat R14 and a pin 1 of the second operational amplifier, the other end of the fourteenth sliding rheostat R14 is connected to one end of a fifteenth resistor R15 and a pin 2 of the second operational amplifier, the other end of the fifteenth resistor R15 is grounded, a pin 3 of the second operational amplifier is connected to one end of a sixteenth resistor R16, the other end of the sixteenth resistor R16 is used for sampling the tenth resistor R10, a pin 7 of the second operational amplifier is connected to one end of a thirteenth resistor R13 and a power supply, the other end of the thirteenth resistor R13 is connected with one end of a seventeenth resistor R17 and a pin 6 of a second operational amplifier, the other end of the seventeenth resistor R17 is grounded, a pin 5 of the second operational amplifier is connected with one end of an eighteenth resistor R18 and one end of a nineteenth resistor R19, the other end of the eighteenth resistor R18 is connected with one end of a third surge resistor LY3 and a pulse modulation signal, the other end of the nineteenth resistor R19 is connected with the pulse modulation signal, and the other end of the third surge resistor LY3 is grounded.
3. The constant current driving circuit of a laser power supply according to claim 1, wherein: the display circuit (50) is an OLED liquid crystal display circuit.
4. The constant current driving circuit of a laser power supply according to claim 1, wherein: the voltage power supply circuit (70) comprises a power supply conversion chip, and the model of the power supply conversion chip is LM78 series chips.
5. The constant current driving circuit of a laser power supply according to claim 1, wherein: the alternating current to direct current circuit (80) comprises a rectifier bridge circuit and a filter circuit.
6. The constant current driving circuit of a laser power supply according to claim 2, wherein: the first operational amplifier and the second operational amplifier are both LM 358.
7. A laser power supply constant current driving method is characterized in that the laser power supply constant current driving method is based on the laser power supply constant current driving circuit of any one of claim 1 to claim 6, and the steps of the laser power supply constant current driving method comprise:
setting a signal control pin of a main control circuit (10) to be at a low level, outputting a signal to a current protection circuit (20) through the main control circuit (10), starting a photoelectric coupler of the current protection circuit (20), and driving an electronic switch to work through a triode amplification circuit to enable a laser power supply to work in a preheating protection mode;
when the current output by the power output circuit (30) is stabilized at 3-5 amperes, a signal control pin of the main control circuit (10) is set to be at a high level, the photoelectric coupler is closed, the electronic switch is closed, the laser power supply works in a current adjustable mode, and the main control circuit (10) controls the digital potentiometer to achieve continuous adjustment of the output current.
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| CN110444995A (en) * | 2019-07-10 | 2019-11-12 | 太原理工大学 | A kind of integreted phontonics tunable photo microwave chip |
| CN114336269B (en) * | 2020-09-29 | 2024-01-16 | 深圳市帝迈生物技术有限公司 | Driving circuit and laser device |
| CN113067556A (en) * | 2021-03-10 | 2021-07-02 | 安徽师范大学 | High-gain microwave power amplifier and simulation method |
| CN113270791B (en) * | 2021-05-08 | 2023-05-16 | 武汉奇致激光技术股份有限公司 | Semiconductor laser power supply driving system |
| CN113809633B (en) * | 2021-07-16 | 2022-12-06 | 中国科学院福建物质结构研究所 | Feedback drive circuit of high-power semiconductor laser driving source |
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