CN108683075A - A kind of high current high frequency modulated laser Constant-power drive circuit and control method - Google Patents
A kind of high current high frequency modulated laser Constant-power drive circuit and control method Download PDFInfo
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- CN108683075A CN108683075A CN201810373548.9A CN201810373548A CN108683075A CN 108683075 A CN108683075 A CN 108683075A CN 201810373548 A CN201810373548 A CN 201810373548A CN 108683075 A CN108683075 A CN 108683075A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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Abstract
The invention discloses a kind of high current high frequency modulated laser Constant-power drive circuit and control methods, constant-current control module includes three integrated operational amplifiers and the first high frequency field-effect tube, wherein the first integrated operational amplifier output end is electrically connected with the first high frequency fet gate, first high frequency FET drain is in series with semiconductor laser, and the second integrated operational amplifier, which samples the first high frequency field-effect tube and inputs the first integrated computation, puts third integrated operational amplifier；There are three input signal input terminals for high frequency lasers switch tool in high frequency modulation module, one of input signal control other two input signal of switching switches over output to the second high frequency fet gate in output end and is electrically connected, parallel semiconductor laser in the second high frequency field-effect tube.Laser drive current is adjusted flexibly to realize that high-energy thermosensitive laser exports in safety, improves High-speed on-off control ability, avoids opening overshoot, improves laser service life.
Description
Technical field
The present invention relates to a kind of laser drive controls, more particularly, to a kind of to making a plate used in thermosensitive CTP platemaking equipment
Laser carries out the driving circuit and control method of drive control.
Background technology
In the types of applications of laser, specific wavelength and power required for light source obtains are used as by semiconductor laser
Laser is a kind of universal and practical way, this also depends on many advantages using semiconductor laser, semiconductor laser
It is compact-sized, small, long lifespan, and be easy to and new integrated design and exploitation；Further, since semiconductor laser be also easy to
Fiber coupling and with the complete optical system of formation such as optical mirror slip, therefore semiconductor laser is also widely used in thermosensitive type
CTP plate-making industries.
For thermosensitive type CTP platemaking equipments, plate-making principle is that will have very high energies by controlling semiconductor laser
Laser emission to plate surface, and control the switch of laser high speed, unwanted medicine film part on printing plate little by little " burnt
Erosion " is fallen, to form the required graph text information of printing, then the printing that is just available on the machine after the processing of follow-up series of steps.And it is hot
The process of quick laser high-speed switch " ablation " medicine film is to utilize the opening and closing of multi-path laser ground different on printing plate in fact
Pixel one by one is got by side, to form complete picture and text, so the consistency of multi-path laser power directly determines printing plate
The consistency of site size, also determines final printing effect, and laser way and laser switch used in making a plate
Speed then determines plate-making efficiency.
If lithography process is wanted to be carried out at high speed, a certain number of laser arrays are not only needed, it will also be to these laser arrays
High frequency modulated is carried out to realize the HF switch characteristic per laser all the way.But due to the thermosensitive laser tool for heat-sensitive plate-making
There is high energy, this means that the circuit of driving laser not only wants that the load of high current can be driven, but also to control
Ensure the consistency of laser power while laser HF switch of the multiplex operation processed under current state.Traditional thermal type
The solution that CTP is used mostly is that a laser corresponds to an individual drive module, not only complicated, although realizing
High current drive capability, but drive laser opening speed slow, and also firing current is unstable；The speed that laser opens and closes
Degree directly affects plate-making efficiency slowly, and laser work electric current shakiness will lead to the pixel size got on printing plate not
One, pixel is uneven will to make the printing effect finally showed be deteriorated.Electric current when work further, since thermosensitive laser is made a plate
It is larger, and switching speed quickly, overshooting problem is significantly opened so can exist in the course of work, if cannot effectively inhibit,
The component for not only impacting driving circuit, will also seriously affect the service life of laser.
Invention content
The present invention is to solve the driving circuit that existing thermosensitive CTP platemaking equipment plate-making laser used carries out drive control to exist
It is complicated, driving laser opening speed it is slow, firing current is unstable, open overshoot phenomenon it is apparent, be easy to driving circuit
Component causes to impact, and laser drive can be adjusted flexibly safely in the one kind for influencing to reduce the present situations such as the service life of laser and provide
Streaming current can have both large current load driving and high frequency modulated ability, improve high speed to realize the output of high-energy thermosensitive laser
Control ability is switched, avoids opening overshoot, improves the high current high frequency modulated laser Constant-power drive electricity of laser service life
Road and control method.
Used specific technical solution is the present invention to solve above-mentioned technical problem：A kind of high current high frequency modulated laser
Constant-power drive circuit, including D/A converter module and reference voltage module, it is characterised in that：Further include governor circuit module,
The governor circuit module includes constant-current control module and high frequency modulation module, constant-current control module input terminal and digital-to-analogue conversion mould
Block output end is electrically connected；The constant-current control module includes the first high frequency field-effect tube and several integrated operational amplifiers,
In the first integrated operational amplifier output end be electrically connected with the first high frequency fet gate, the first high frequency FET drain
It is in series with semiconductor laser, the first high frequency field-effect tube source electrode sampled signal and the second integrated operational amplifier input terminal phase
Electrical connection, the input of the second integrated operational amplifier output end voltage division signal are connected to third integrated operational amplifier input terminal, simultaneously
The input of second integrated operational amplifier output end is connected to the first integrated operational amplifier input terminal, amplifies as the first integrated computation
The input control comparison signal of device input terminal, third integrated operational amplifier output end and the laser controlling plate phase in laser system
Electrical connection；The high frequency modulation module includes high frequency lasers switch, the second high frequency field-effect tube and the 4th integrated operational amplifier,
4th integrated operational amplifier input terminal is electrically connected with D/A converter module output end, and there are three inputs for high frequency lasers switch tool
Signal input part, the 4th integrated operational amplifier output end signal and supply voltage positive signal input be connected to two of which respectively
Input signal input terminal switches connection selection signal, the high speed of third input signal input terminal and control switching as output
Control signal is electrically connected, and high frequency lasers output switching terminal is electrically connected with the second high frequency fet gate, the second high frequency field
Parallel semiconductor laser on effect pipe.Laser drive circuit is connected to laser data processing and control module and semiconductor laser
Device can provide stable operating current for semiconductor laser, laser drive current can be adjusted flexibly safely to realize high-energy
The output of thermosensitive laser can have both large current load driving and high frequency modulated ability, improve High-speed on-off control ability, avoid out
Overshoot is opened, laser service life is improved.
Preferably, the constant-current control module includes the first high frequency field-effect tube and three integrated operational amplifiers,
Input is connected to the first integrated computation and puts wherein after electric current adjustment control signal the 4th resistance of series connection of D/A converter module output end
Big device negative input end, the first integrated operational amplifier output end are electrically connected with the first high frequency fet gate, the first high frequency
It is electrically connected with supply voltage earth polar after field-effect tube source series sampling resistor, the first high frequency field-effect tube source series the 8th
It is electrically connected with the second integrated operational amplifier positive input terminal after resistance, while the second integrated operational amplifier positive input terminal is connected
It is electrically connected with supply voltage earth polar after 9th resistance；Second integrated operational amplifier output end is connected after the 5th resistance with first
Integrated operational amplifier positive input terminal is electrically connected, the second integrated operational amplifier output end connect twelfth resistor after with third
Integrated operational amplifier positive input terminal is electrically connected, third integrated operational amplifier positive input terminal connect thirteenth resistor after with electricity
Source voltage earth polar is electrically connected；The output of third integrated operational amplifier output end is mutually electrically connected with the laser controlling plate in laser system
It connects, third integrated operational amplifier output end is electrically connected with current anomaly indicator light circuit.Improve the constant flow regulation to laser
Drive control effect improves the work stability and reliability of laser.
Preferably, the high frequency modulation module includes high frequency lasers switch, the second high frequency field-effect tube and the 4th collection
It is mutually electric with D/A converter module output end after the 4th integrated operational amplifier negative input end series connection first resistor at operational amplifier
It connects, is electrically connected with supply voltage earth polar after the 4th integrated operational amplifier positive input terminal series connection second resistance, high frequency lasers
There are three input signal input terminals for switch tool, and first signal input part of high frequency lasers switch and the 4th integrated operational amplifier are defeated
Outlet is mutually directly electrically connected, and input is defeated with second signal of high frequency lasers switch after supply voltage anode series connection overshoot current-limiting resistance
Enter end to be electrically connected, high frequency lasers switch third signal input part is electrically connected with high-speed control signal, the 4th integrated computation
Amplifier out is electrically connected high frequency capacitor, and high frequency lasers output switching terminal is mutually electrically connected with the second high frequency fet gate
It connects, parallel semiconductor laser in the drain electrode of the second high frequency fet gate and source electrode；Laser anode and the second high frequency field
The drain electrode of effect pipe is electrically connected, and laser cathode is electrically connected with the first high frequency FET drain, and laser both ends are in parallel steady
Pressure diode and the second capacitance, wherein zener diode cathode are electrically connected with laser anode.Improve High-speed on-off control energy
Power avoids opening overshoot, improves laser service life.
Preferably, the third integrated operational amplifier output end feedback signal input is connected to the first high frequency field-effect
Tube grid, third integrated operational amplifier output end connect the second diode after be electrically connected with the first integrated operational amplifier output end
It connects, the second diode cathode is electrically connected with the first integrated operational amplifier output end.It improves and the abnormal current of laser is driven
Defense controls regulating effect prevents abnormal current from damaging laser.
Preferably, single laser drive circuit is at most independently drivingly connected 16 semiconductor lasers.Raising can drive
Using number of lasers, drive efficiency and the simple and convenient property of wiring are improved.
It is mutually electrically connected with control module preferably, laser drive circuit prime is handled with the laser data in laser system
It connects, laser drive circuit rear class is mutually drivingly connected with multiple semiconductor lasers, laser rear class and the laser in laser system
Power detection module is electrically connected, and laser power detection module rear class is electrically connected with the laser controlling plate in laser system, swashs
Laser controlling plate prime in photosystem is electrically connected with laser drive circuit and laser power detection module respectively.It improves to swashing
The detection of light device and the laser data processing of laser drive circuit and control effect.
It is mutually electrically connected with supply voltage earth polar after the first diode preferably, the first high frequency FET drain is connected
It connects, the first diode cathode is electrically connected with the first high frequency FET drain, the first high frequency fet gate series connection third
It is electrically connected with supply voltage earth polar after capacitance, the 7th resistance in parallel between the first high frequency fet gate and source electrode.It improves
Protective effect to the first high frequency field-effect tube reduces the first high frequency field-effect tube and damages phenomenon.
Preferably, the first high frequency fet gate connect the 4th diode after with laser controlling plate in laser system
Current anomaly control signal is electrically connected.It improves and defense controls regulating effect is driven to the abnormal current of laser, prevent exception
Circuit damage laser.
Another goal of the invention of the present invention is to provide a kind of high current high frequency modulated laser Constant-power drive circuit control
Method processed, it is characterised in that：Including process control as follows
A. the D/A converter module described in one of above-mentioned technical proposal is received from laser data processing and control in laser system
The data of module, the electric current adjustment control signal obtained after the processing of D/A converter module, electric current adjustment control signal are straight
It picks to the first integrated operational amplifier input terminal in the constant-current control module described in one of above-mentioned technical proposal；
B. the constant-current control module described in one of above-mentioned technical proposal flows through the electric current of the first high frequency field-effect tube, control by control
The operating current of semiconductor laser processed；
C. the sampled signal obtained on the source electrode sampling resistor of the first high frequency field-effect tube described in one of above-mentioned technical proposal is straight
It connects and is input to the second integrated operational amplifier input terminal, compare as the second integrated operational amplifier input control signal；
D. it is defeated to be fed through the first integrated operational amplifier for the second integrated operational amplifier output described in one of above-mentioned technical proposal
Enter end, as the first integrated operational amplifier input control comparison signal；Second integrated operational amplifier output simultaneously is by electricity
Input is sent to third integrated operational amplifier input terminal after resistance partial pressure, and another input of third integrated operational amplifier comes from first
The electric current adjustment control signal of integrated operational amplifier input terminal, third integrated operational amplifier adjust control signal by electric current
Two input signal ratios of signal are adjusted with divider resistance, obtains and third integrated operational amplifier output signal is delivered to laser
The laser controlling plate input signal of laser controlling plate in system；
E. when two input end signal ratios of third integrated operational amplifier exceed divider resistance ratio, above-mentioned technical proposal
One of described in third integrated operational amplifier output end current anomaly indicator light circuit in current anomaly indicator light light
Work, indicates the constant-current control module operation irregularity, indicate electric current by semiconductor laser already less than or have exceeded
Its running current range；The output end signal of third integrated operational amplifier is delivered to the laser control in laser system simultaneously
Making sheet, after the processing of laser controlling plate, while current anomaly indicator light lights work, laser controlling plate can be by being connected to
Current anomaly control signal at first high frequency fet gate closes the first high frequency field-effect tube by force, from thirty years of age
Semiconductor laser is closed, prevents laser device from damaging；
When f. having adjusted laser works electric current in the constant-current control module, and having remained setting value size, institute
The 4th integrated operational amplifier stated in high frequency modulation module is started to work；4th integrated operational amplifier output end is sent to high frequency
First input signal input terminal of laser switch, supply voltage positive signal are opened by being sent to high frequency lasers after overshoot current-limiting resistance
Second input signal input terminal is closed, while laser data processing and the high-speed control signal of control module are also led in laser system
It crosses third input signal input terminal to be sent into inside laser HF switch, and controls the output end of laser HF switch at first
It is switched between input signal and second input signal the two input signal, once the output end of the laser HF switch
It is connect one of with two input signals internal, then just can be immediately detected no any decaying in laser HF switch output end
High frequency lasers switch output signal is fed through the second high frequency fet gate, with laser height by one of two input signals
Frequency switch output signal constantly switches, and the second high frequency field-effect tube also rapidly will be closed and be opened, while the semiconductor
Laser is also corresponding to be turned on and off.
Stable operating current can be provided for semiconductor laser, laser drive current can be adjusted flexibly safely to realize height
The output of energy thermosensitive laser can have both large current load driving and high frequency modulated ability, improve High-speed on-off control ability, keep away
Exempt to open overshoot, improves laser service life.
Preferably, switching to the 4th integrated operational amplifier when high frequency modulation module is adjusted to the laser HF switch
When, by the detection of the laser power detection module in laser system, laser is closed just, then the laser in laser system
Control panel will get off the data record of the 4th integrated operational amplifier；When work of making a plate starts, the data of record are just
It can be fed directly to the input terminal of the 4th integrated operational amplifier, be connected to the high frequency capacitance of the 4th integrated operational amplifier output end
Make stable output signal in corresponding setting value, being then input to the high-speed control signal of laser HF switch will constantly control
The output end signal of laser HF switch switches at high speed between the two input signals, to make the second high frequency field-effect tube be connected
Or shutdown, the closing and unlatching of corresponding control laser works state；Simultaneously because constant-current control module adjusts laser
Just no longer change after setting electric current value, and remain setting value size, therefore high frequency modulation module High-speed Control is only needed to swash
The switch of light device on printing plate so that get pixel one by one.Improve the work stability and reliability of laser.
The beneficial effects of the invention are as follows：Laser drive circuit is connected to laser data processing and swashs with control module and semiconductor
Light device can provide stable operating current for semiconductor laser, and field-effect tube driving power is big, and laser can be adjusted flexibly safely
Driving current can have both large current load driving and high frequency modulated ability, improve high speed to realize the output of energy thermosensitive laser
Control ability is switched, avoids opening overshoot, improves laser service life.
Description of the drawings：
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 be high current high frequency modulated laser Constant-power drive circuit of the present invention structural principle block diagram and use in laser
Structural principle block diagram structural schematic diagram in system.
Fig. 2 is that the circuit structure of governor circuit module in high current high frequency modulated laser Constant-power drive circuit of the present invention shows
It is intended to.
Specific implementation mode
Embodiment 1：
In Fig. 1, embodiment shown in Fig. 2, a kind of high current high frequency modulated laser Constant-power drive circuit, including digital-to-analogue conversion mould
Block 02, reference voltage module 03 and governor circuit module 01, the governor circuit module 01 include constant-current control module 20 and height
Frequency modulation module 30,20 input terminal of constant-current control module are electrically connected with D/A converter module output end 02；Reference voltage mould 03
A variety of accurate adjustable reference voltages and supply voltage, digital-to-analogue conversion are provided for D/A converter module 02 and governor circuit module 01
Module converts complicated control data information to accurate simulation controlled quentity controlled variable and send the integrated transporting discharging into constant-current control module defeated
Enter end, the constant-current control module 20 includes the first high frequency field-effect tube N1 and several integrated operational amplifiers, the first high frequency field
Effect pipe N1 is N-channel field-effect tube, wherein the first integrated operational amplifier OP2 output ends and the first high frequency field-effect tube N1 grid
Pole is electrically connected, and the first high frequency field-effect tube N1 drain electrodes are in series with semiconductor laser 40, the first sources high frequency field-effect tube N1
Pole sampled signal is electrically connected with the second integrated operational amplifier OP3 input terminals, the second integrated operational amplifier OP3 output ends point
Pressure signal input is connected to third integrated operational amplifier OP4 input terminals, while the second integrated operational amplifier OP3 output ends input
The first integrated operational amplifier OP2 input terminals are connected to, the input control as the first integrated operational amplifier OP2 input terminals compares
Signal, third integrated operational amplifier OP4 output ends are electrically connected with the laser controlling plate 80 in laser system；The high frequency modulation
Molding block 30 includes high frequency lasers switch U1, the second high frequency field-effect tube P1 and the 4th integrated operational amplifier OP1, and the 4th is integrated
Operational amplifier OP1 input terminals are electrically connected with 02 output end of D/A converter module, and there are three input letters for high frequency lasers switch tool
Number input terminal, first signal input part of high frequency lasers switch U1 are electrically connected with the 4th integrated operational amplifier OP1 output ends,
It inputs after supply voltage anode VCC series connection overshoot current-limiting resistances Re and is mutually electrically connected with second signal input part of high frequency lasers switch
It connects, high frequency lasers switch U1 thirds signal input part is electrically connected with high-speed control signal LDSW（See Fig. 2）, high frequency lasers open
Output end is closed in the case where the high-speed control signal LDSW of third signal input part switches at high speed control, in supply voltage anode VCC
And the 4th switch between integrated operational amplifier output end negative pressure, to switch at high speed the switch of the second high frequency MOS field effect transistor of control；
When high frequency lasers output switching terminal is negative pressure, the second high frequency field-effect tube P1 is opened, and laser is closed；High frequency lasers switch
When output end is supply voltage anode VCC, the second high frequency field-effect tube is closed, and laser opens work.High frequency lasers are opened
It closes U1 output ends to be electrically connected with the second high frequency field-effect tube P1 grids, parallel semiconductor laser on the second high frequency field-effect tube P1
Device.High-speed control signal LDSW is accessed from the laser data processing in laser system with control module 90, high frequency lasers switch U1
Using the analog switch chip of model ADG619, input and output are almost without the realization high-speed control signal LDSW of decaying and
Four integrated operational amplifier OP1 output end signals switch at high speed, and the second high frequency field-effect tube P1 uses P-channel field-effect transistor (PEFT) pipe；It is permanent
Flow control module 20 includes the first high frequency field-effect tube N1 and three integrated operational amplifiers, and wherein D/A converter module 02 exports
Input is connected to the first integrated operational amplifier OP2 negative inputs after the 4th resistance R4 of electric current adjustment control signal CRST series connection at end
End, the first integrated operational amplifier OP2 output ends are electrically connected with the first high frequency field-effect tube N1 grids, the first high frequency field-effect
It is electrically connected with supply voltage earth polar after pipe N1 source series sampling resistors RS, the first high frequency field-effect tube N1 source series the 8th
It is electrically connected with the second integrated operational amplifier OP3 positive input terminals after resistance R8, while the second integrated operational amplifier OP2 is just defeated
It is electrically connected with supply voltage earth polar after entering the 9th resistance R9 of end series connection；Second integrated operational amplifier OP3 output ends series connection the
It is electrically connected with the first integrated operational amplifier OP2 positive input terminals after five resistance R5, the second integrated operational amplifier OP3 output ends
It is electrically connected with third integrated operational amplifier OP4 positive input terminals after series connection twelfth resistor R12, third integrated operational amplifier
It is electrically connected with supply voltage earth polar after OP4 positive input terminals series connection thirteenth resistor R13；Third integrated operational amplifier OP4 is defeated
Outlet output is electrically connected with the laser controlling plate 80 in laser system, the electrical connection of third integrated operational amplifier OP4 output ends
There is current anomaly indicator light circuit.Current anomaly indicator light LED is electrically connected on current anomaly indicator light circuit；It is drawn to improve
Terseness VLST and CRST are respectively Voltage Set and Current Set abbreviations, and VLST signals are used for adjusting finally entering
The vacuum magnitude switched to high frequency lasers, CRST signals are used for adjusting laser works electric current.High frequency modulation module 30 includes height
Frequency laser switch U1, the second high frequency field-effect tube P1 and the 4th integrated operational amplifier OP1, the 4th integrated operational amplifier OP1
It is electrically connected with 02 output end of D/A converter module after negative input end series connection first resistor R1, the 4th integrated operational amplifier OP1
Be electrically connected with supply voltage earth polar after positive input terminal series connection second resistance R2, mono- signal input part of high frequency lasers switch U1 and
4th integrated operational amplifier OP1 output ends are mutually directly electrically connected, another signal input part of high frequency lasers switch U1 and high speed
Control signal LDSW is electrically connected, and the 4th integrated operational amplifier OP1 output ends are electrically connected high frequency capacitor Ca, and high frequency lasers are opened
It closes U1 output ends to be electrically connected with the second high frequency field-effect tube P1 grids, in the drain electrode of the second high frequency field-effect tube P1 and source electrode simultaneously
Join semiconductor laser Laser；The upper second input signal input terminal of high frequency lasers switch U1, which is electrically connected with, prevents laser from opening
The overshoot current-limiting resistance Re of overshoot, improves the service life and reliability of laser, laser Laser anodes and second high
The P1 drain electrodes of frequency field-effect tube are electrically connected, and laser Laser cathode are electrically connected with the first high frequency field-effect tube N1 drain electrodes, laser
The both ends device Laser shunt regulator diode ZD and the second capacitance C2, wherein zener diode ZD cathodes and laser Laser anodes
It is electrically connected.The VLFD inputs of third integrated operational amplifier output end feedback signal are connected to the first high frequency field-effect tube N1 grids,
It is electric with the first integrated operational amplifier OP2 output ends after the second diode D2 of third integrated operational amplifier OP4 output ends series connection
Connection, the second diode D2 anodes are electrically connected with the first integrated operational amplifier OP2 output ends.Laser drive circuit 10 is at most solely
It is vertical to be drivingly connected 16 semiconductor lasers.10 prime of laser drive circuit and the laser data processing and control in laser system
Module 90 is electrically connected, and 10 rear class of laser drive circuit is drivingly connected with 40 phase of multiple semiconductor lasers, 40 rear class of laser
It is electrically connected with the laser power detection module 50 in laser system, in 50 rear class of laser power detection module and laser system
Laser controlling plate 80 is electrically connected, laser controlling plate 80 respectively in laser system master control borad 70 and 60 phase of host computer be electrically connected
It connects, 70 prime of master control borad in laser system is electrically connected with the upper plate 60 in laser system, the master control borad in laser system
70 rear classes are electrically connected with laser controlling plate 80 and laser data processing with control module 90 respectively, the laser control in laser system
80 prime of making sheet is electrically connected with laser drive circuit 10 and laser power detection module 50 respectively.First high frequency field-effect tube N1
It is electrically connected with supply voltage earth polar after the first diode of drain series D1, the first diode D1 cathodes and the first high frequency field are imitated
Should pipe N1 drain electrode be electrically connected, be mutually electrically connected with supply voltage earth polar after the first high frequency field-effect tube N1 gate series third capacitances C3
It connects, the 7th resistance R7 of parallel connection between the first high frequency field-effect tube N1 grids and source electrode.First high frequency field-effect tube N1 gate series
Current anomaly control signal LDEN after 4th diode D4 with laser controlling plate 80 in laser system is electrically connected.If third
The ratio of two input end signals of integrated operational amplifier OP4 exceeds the ratio of divider resistance, then is put with third integrated computation
Indicator light LED on big device OP4 output ends connection current anomaly indicator light circuit, which will light indicator light, to be lighted, indicate by
In constant-current control module operation irregularity, the electric current of laser Laser is indicated less or more than its running current range, together
When third integrated operational amplifier OP4 output end feedback signal VLFD send the laser controlling plate into laser system（Institute in Fig. 1
Show）, after the processing of laser controlling plate, while the current anomaly indicator light LED light lights, laser controlling plate can pass through company
The control signal LDEN for being connected to the first high frequency field-effect tube N1 grids closes the first high frequency field-effect tube N1 by force, to real
Laser Laser is now closed immediately, and playing effective and safe prevents the device failure of laser, and it is safe and reliable to improve laser
Property, improve service life.
Implement:2：
A kind of high current high frequency modulated laser Constant-power drive circuit control method, including process control as follows
A. D/A converter module described in embodiment 1 receives the number of laser data processing and control module in laser system
According to the electric current adjustment control signal obtained after the processing of D/A converter module, electric current adjustment control signal is fed directly to reality
Apply the first integrated operational amplifier input terminal in the constant-current control module described in example 1；
B. constant-current control module described in embodiment 1 flows through the electric current of the first high frequency field-effect tube by control, controls semiconductor
The operating current of laser；
C. the sampled signal obtained on the source electrode sampling resistor of the first high frequency field-effect tube described in embodiment 1 is directly inputted into
Second integrated operational amplifier input terminal compares as the second integrated operational amplifier input control signal；
D. the second integrated operational amplifier output described in embodiment 1 is fed through the first integrated operational amplifier input terminal, as
First integrated operational amplifier input control comparison signal；Second integrated operational amplifier output simultaneously is defeated after electric resistance partial pressure
Enter to send to third integrated operational amplifier input terminal, another input of third integrated operational amplifier is put from the first integrated computation
The electric current adjustment control signal of big device input terminal, third integrated operational amplifier adjust control signal and divider resistance by electric current
Two input signal ratios of signal are adjusted, obtains and third integrated operational amplifier output signal is delivered to laser in laser system
The laser controlling plate input signal of control panel；
E. when two input end signal ratios of third integrated operational amplifier exceed divider resistance ratio, the third of embodiment 1
Current anomaly indicator light in the current anomaly indicator light circuit of integrated operational amplifier output end lights work, indicates the perseverance
Flow control module operation irregularity, indicate electric current by semiconductor laser already less than or have exceeded its running current model
It encloses；The output end signal of third integrated operational amplifier is delivered to the laser controlling plate in laser system simultaneously, through laser controlling
After plate processing, while current anomaly indicator light lights work, laser controlling plate can be by being connected to the first high frequency field-effect
Current anomaly control signal at tube grid closes the first high frequency field-effect tube by force, swashs to close semiconductor immediately
Light device, prevents laser device from damaging；
When f. having adjusted laser works electric current in the constant-current control module, and having remained setting value size, institute
The 4th integrated operational amplifier stated in high frequency modulation module is started to work；4th integrated operational amplifier output end is sent to high frequency
First input signal input terminal of laser switch, supply voltage positive signal are opened by being sent to high frequency lasers after overshoot current-limiting resistance
Second input signal input terminal is closed, while laser data processing and the high-speed control signal of control module are also led in laser system
It crosses third input signal input terminal to be sent into inside laser HF switch, and controls the output end of laser HF switch at first
It is switched between input signal and second input signal the two input signal, once the output end of the laser HF switch
It is connect one of with two input signals internal, then just can be immediately detected no any decaying in laser HF switch output end
High frequency lasers switch output signal is fed through the second high frequency fet gate, with laser height by one of two input signals
Frequency switch output signal constantly switches, and the second high frequency field-effect tube also rapidly will be closed and be opened, while the semiconductor
Laser is also corresponding to be turned on and off.
When high frequency modulation module, which is adjusted to the laser HF switch, switches to four integrated operational amplifiers, through too drastic
The detection of laser power detection module in photosystem, laser are closed just, and then the laser controlling plate in laser system is just
The data record of 4th integrated operational amplifier can be got off；When work of making a plate starts, the data of record will directly be sent
To the input terminal of the 4th integrated operational amplifier, being connected to the high frequency capacitance of the 4th integrated operational amplifier output end makes output believe
Number stablize in corresponding setting value, laser high frequency will constantly be controlled by being then input to the high-speed control signal of laser HF switch
The output end signal of switch switches at high speed between the two input signals, to make the second high frequency field-effect tube on or off,
The closing and unlatching of corresponding control laser works state；Simultaneously because constant-current control module adjusts the setting electric current of laser
Just no longer change after value, and remain setting value size, therefore only needs opening for high frequency modulation module High-speed Control laser
It closes to get pixel one by one on printing plate.
Arrow as shown in Figure 1 is directed toward, and when platemaking equipment powers on start-up operation, the host computer in laser system can root first
According to plate-making file in include a series of all working parameter to the laser system of relevant operating parameter delivering into
The instruction of row adjustment, and the and then work of start parameter configuration.Host computer in laser system is by the relevant finger of parameter configuration
It enables and data is sent to the master control borad in laser system, after the master control borad in laser system receives parameter configuration, can protect
Deposit corresponding control parameter, and by adjustment in need parameter configuration data preliminary treatment after be further transmitted to laser system
In laser controlling plate, the laser controlling plate in laser system is equivalent to the action mission control center of laser system, its basis
Instruction and data is sent to the processing of the laser data in laser system and control module, laser system by parameter configuration data one by one
In laser data processing and center of the control centre as data processing then controlled after data and instruction further decomposition
Laser drive circuit in laser system is adjusted rapidly, and after parameter adjustment, laser drive circuit can drive semiconductor
Laser is opened, and the laser high-speed switch after being adjusted according to parameter configuration data sends out thermosensitive laser, while laser work(
Rate detection module starts to detect laser power size in real time and by data feedback to the laser controlling plate, swashing in laser system
The data that original parameter configuration data and laser power detection module feedback can be compared inside Opital control board, by complicated meter
It calculates and compensates, from which further follow that secondary adjusting parameter data, and issue step by step according to above-mentioned flow, be finally reflected the laser
The update of device laser power adjusts, and so entire laser system forms a complete closed loop, until the laser in laser system
The data that detection module is fed back to are consistent with parameter configuration data, and entire parameter adjustment work is completed.
After the completion of parameter adjustment work, platemaking equipment starts work of making a plate, and lithography process is carried out at high speed, described
Graph text information can be sent to the master control borad by host computer in real time, and at this moment, the graph text information for file of making a plate is no longer pass through institute
The laser controlling plate stated, but data flow is directly sent to by the master control borad by the laser number by high speed data lines
According to processing and control module, there are several gate circuits inside the laser data processing and control module in laser system, it is described
Plate-making graph text information data are converted into the real time control command of laser switch by gate circuit, and by the laser data handle with
Control module directly controls the laser drive circuit noise spectra of semiconductor lasers and is driven, the laser drive circuit control
The switch that the laser carries out high speed is made to ultimately form required for printing to get pixel one by one on printing plate
Graph text information.
Above-mentioned technical proposal of the present invention, which can get advantageous effect, to be had：
1. driving circuit integrated level is high, compact-sized, the driving plate of one piece of laser drive circuit can drive No. 16 lasers simultaneously；
2. the constant-current control module of laser drive circuit, which only uses a small amount of component i.e., realizes High-current output and flexible work
State controls；3. constant-current control module and the cooperation of high frequency modulated control module in laser drive circuit, arbitrary flexibly control swash
Light device switchs degree, realizes that laser works electric current stepless changing and high speed open and close；4. laser drive circuit is easy to
It is integrated, and can further upgrade, only need to simply adjust can have the driving capability doubled, and still have high-speed switch
Characteristic；5. most of component used in entire laser drive circuit be all it is common be easy to get, manufacturing cost is low, it is easy to accomplish with
It safeguards.
The above content and structure describes the basic principles and main features and advantages of the present invention of product of the present invention, one's own profession
The technical staff of industry should be recognized that.Merely illustrating the principles of the invention described in examples detailed above and specification is not departing from this
Under the premise of spirit and range, various changes and improvements may be made to the invention, these changes and improvements belong to requirement and protect
Within the scope of the invention of shield.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (10)
1. a kind of high current high frequency modulated laser Constant-power drive circuit, including D/A converter module and reference voltage module,
It is characterized in that：Further include governor circuit module, the governor circuit module includes constant-current control module and high frequency modulation module, perseverance
Flow control module input terminal is electrically connected with D/A converter module output end；The constant-current control module is imitated including the first high frequency field
Should manage with several integrated operational amplifiers, wherein the first integrated operational amplifier output end and the first high frequency fet gate phase
Electrical connection, the first high frequency FET drain are in series with semiconductor laser, the first high frequency field-effect tube source electrode sampled signal
It is electrically connected with the second integrated operational amplifier input terminal, the input of the second integrated operational amplifier output end voltage division signal is connected to the
Three integrated operational amplifier input terminals, while the input of the second integrated operational amplifier output end is connected to the first integrated operational amplifier
Input terminal, as the input control comparison signal of the first integrated operational amplifier input terminal, the output of third integrated operational amplifier
End is electrically connected with the laser controlling plate in laser system；The high frequency modulation module includes high frequency lasers switch, the second high frequency
Field-effect tube and the 4th integrated operational amplifier, the 4th integrated operational amplifier input terminal are mutually electric with D/A converter module output end
Connection, there are three input signal input terminal, the 4th integrated operational amplifier output end signal and power supply electricity for high frequency lasers switch tool
Pressure positive signal inputs respectively is connected to two of which input signal input terminal, switches connection selection signal, third as output
Input signal input terminal and the high-speed control signal of control switching are electrically connected, high frequency lasers output switching terminal and the second high frequency field
Effect tube grid is electrically connected, parallel semiconductor laser in the second high frequency field-effect tube.
2. high current high frequency modulated laser Constant-power drive circuit described in accordance with the claim 1, it is characterised in that：The perseverance
Flow control module includes the first high frequency field-effect tube and three integrated operational amplifiers, the wherein electricity of D/A converter module output end
Input is connected to the first integrated operational amplifier negative input end after stream adjustment control signal the 4th resistance of series connection, and the first integrated computation is put
Big device output end is electrically connected with the first high frequency fet gate, after the first high frequency field-effect tube source series sampling resistor and
Supply voltage earth polar is electrically connected, after the 8th resistance of the first high frequency field-effect tube source series just with the second integrated operational amplifier
Input terminal is electrically connected, while mutually electric with supply voltage earth polar after the second integrated operational amplifier positive input terminal the 9th resistance of series connection
Connection；It is mutually electrically connected with the first integrated operational amplifier positive input terminal after second integrated operational amplifier output end the 5th resistance of series connection
It connects, is mutually electrically connected with third integrated operational amplifier positive input terminal after the second integrated operational amplifier output end series connection twelfth resistor
It connects, is electrically connected with supply voltage earth polar after third integrated operational amplifier positive input terminal series connection thirteenth resistor；Third is integrated
Operational amplifier output terminal output is electrically connected with the laser controlling plate in laser system, third integrated operational amplifier output end
It is electrically connected with current anomaly indicator light circuit.
3. high current high frequency modulated laser Constant-power drive circuit described in accordance with the claim 1, it is characterised in that：The height
Frequency modulation module includes high frequency lasers switch, the second high frequency field-effect tube and the 4th integrated operational amplifier, the 4th integrated computation
It is electrically connected with D/A converter module output end after amplifier negative input end series connection first resistor, the 4th integrated operational amplifier is just
It is electrically connected with supply voltage earth polar after input terminal series connection second resistance, first signal input part of high frequency lasers switch and the 4th
Integrated operational amplifier output end is mutually directly electrically connected, input and high frequency lasers after supply voltage anode series connection overshoot current-limiting resistance
Second signal input part of switch is electrically connected, and high frequency lasers switch third signal input part is mutually electrically connected with high-speed control signal
It connects, the 4th integrated operational amplifier output end is electrically connected high frequency capacitor, and high frequency lasers output switching terminal and the second high frequency field are imitated
Tube grid is answered to be electrically connected, parallel semiconductor laser in the drain electrode of the second high frequency field-effect tube and source electrode；Laser anode with
Second high frequency FET drain is electrically connected, and laser cathode is electrically connected with the first high frequency FET drain, laser
Both ends shunt regulator diode and the second capacitance, wherein zener diode cathode are electrically connected with laser anode.
4. high current high frequency modulated laser Constant-power drive circuit according to claim 2, it is characterised in that：Described
The input of three integrated operational amplifier output end feedback signals is connected to the first high frequency fet gate, third integrated operational amplifier
It is electrically connected with the first integrated operational amplifier output end after output end the second diode of series connection, the second diode cathode and the first collection
It is electrically connected at operational amplifier output terminal.
5. high current high frequency modulated laser Constant-power drive circuit described in accordance with the claim 1, it is characterised in that：Single laser
Driving circuit is at most independently drivingly connected 16 semiconductor lasers.
6. high current high frequency modulated laser Constant-power drive circuit described in accordance with the claim 1, it is characterised in that：Laser Driven
Circuit prime is handled with the laser data in laser system and is electrically connected with control module, laser drive circuit rear class and multiple half
Conductor laser is mutually drivingly connected, and laser rear class is electrically connected with the laser power detection module in laser system, laser work(
Rate detection module rear class is electrically connected with the laser controlling plate in laser system, the laser controlling plate prime difference in laser system
It is electrically connected with laser drive circuit and laser power detection module.
7. high current high frequency modulated laser Constant-power drive circuit described in accordance with the claim 1, it is characterised in that：Described
One high frequency FET drain connects and is electrically connected with supply voltage earth polar after the first diode, the first diode cathode and the
One high frequency FET drain is electrically connected, the first high frequency fet gate connect third capacitance after with supply voltage earth polar phase
Electrical connection, the 7th resistance in parallel between the first high frequency fet gate and source electrode.
8. high current high frequency modulated laser Constant-power drive circuit described in accordance with the claim 1, it is characterised in that：Described
After one high frequency fet gate the 4th diode of series connection signal phase is controlled with the current anomaly of laser controlling plate in laser system
Electrical connection.
9. a kind of high current high frequency modulated laser Constant-power drive circuit control method, it is characterised in that：Including mistake control as follows
Journey
A. the D/A converter module described in one of claim 1~8 is received from laser data processing and control in laser system
The data of module, the electric current adjustment control signal obtained after the processing of D/A converter module, electric current adjustment control signal are straight
It picks to the first integrated operational amplifier input terminal in the constant-current control module described in one of claim 1~8；
B. the constant-current control module flows through the electric current of the first high frequency field-effect tube by control, controls semiconductor laser
Operating current；
C. the sampled signal obtained on the source electrode sampling resistor of the first high frequency field-effect tube described in one of claim 1~8 is straight
It connects and is input to the second integrated operational amplifier input terminal, compare as the second integrated operational amplifier input control signal；
D. it is defeated to be fed through the first integrated operational amplifier for the second integrated operational amplifier output described in one of claim 1~8
Enter end, as the first integrated operational amplifier input control comparison signal；Second integrated operational amplifier output simultaneously is by electricity
Input is sent to third integrated operational amplifier input terminal after resistance partial pressure, and another input of third integrated operational amplifier comes from first
The electric current adjustment control signal of integrated operational amplifier input terminal, third integrated operational amplifier adjust control signal by electric current
Two input signal ratios of signal are adjusted with divider resistance, obtains and third integrated operational amplifier output signal is delivered to laser
The laser controlling plate input signal of laser controlling plate in system；
E. when two input end signal ratios of third integrated operational amplifier exceed divider resistance ratio, claim 1~8
One of described in third integrated operational amplifier output end current anomaly indicator light circuit in current anomaly indicator light light
Work, indicates the constant-current control module operation irregularity, indicate electric current by semiconductor laser already less than or have exceeded
Its running current range；The output end signal of third integrated operational amplifier is delivered to the laser control in laser system simultaneously
Making sheet, after the processing of laser controlling plate, while current anomaly indicator light lights work, laser controlling plate can be by being connected to
Current anomaly control signal at first high frequency fet gate closes the first high frequency field-effect tube by force, from thirty years of age
Semiconductor laser is closed, prevents laser device from damaging；
When f. having adjusted laser works electric current in the constant-current control module, and having remained setting value size, power
Profit requires the 4th integrated operational amplifier in the high frequency modulation module described in one of 1~8 to start to work；4th integrated computation is put
Big device output end is sent to first input signal input terminal of high frequency lasers switch, and supply voltage positive signal is by overshooting current limliting electricity
It is sent after resistance to second input signal input terminal of high frequency lasers switch, while laser data processing and control module in laser system
High-speed control signal be sent into inside laser HF switch also by third input signal input terminal, and control laser high frequency and open
The output end of pass switches between first input signal and second input signal the two input signal, once described swash
The output end of light HF switch is connect internal one of with two input signals, then just can be examined immediately in laser HF switch output end
High frequency lasers switch output signal is fed through the second high frequency field-effect by one of two input signals for measuring no any decaying
Tube grid, as laser HF switch output signal constantly switches, the second high frequency field-effect tube also will rapidly close closing and opening
It opens, while the semiconductor laser is also corresponding is turned on and off.
10. high current high frequency modulated laser Constant-power drive circuit control method, feature exist according to claim 9
In：When high frequency modulation module, which is adjusted to the laser HF switch, switches to four integrated operational amplifiers, by laser system
The detection of laser power detection module in system, laser are closed just, and then the laser controlling plate in laser system will incite somebody to action
The data record of 4th integrated operational amplifier is got off；When work of making a plate starts, the data of record will be fed directly to the
The input terminal of four integrated operational amplifiers, being connected to the high frequency capacitance of the 4th integrated operational amplifier output end keeps output signal steady
It is scheduled on corresponding setting value, laser HF switch will constantly be controlled by being then input to the high-speed control signal of laser HF switch
Output end signal switch at high speed between the two input signals, it is corresponding to make the second high frequency field-effect tube on or off
Control the closing and unlatching of laser works state；Simultaneously because after constant-current control module adjusts the setting electric current value of laser
Just no longer change, and remain setting value size, thus only need the switch of high frequency modulation module High-speed Control laser from
And pixel one by one is got on printing plate.
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| CN201810373548.9A CN108683075A (en) | 2018-04-24 | 2018-04-24 | A kind of high current high frequency modulated laser Constant-power drive circuit and control method |
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| CN201810373548.9A CN108683075A (en) | 2018-04-24 | 2018-04-24 | A kind of high current high frequency modulated laser Constant-power drive circuit and control method |
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| CN109581238A (en) * | 2018-12-05 | 2019-04-05 | 珠海东帆科技有限公司 | A kind of internal resistance of cell measuring circuit and measurement method |
| CN109950790A (en) * | 2019-04-03 | 2019-06-28 | 中国科学院苏州生物医学工程技术研究所 | A kind of laser control circuit, a kind of laser aid |
| CN114978130A (en) * | 2022-05-05 | 2022-08-30 | 北京市科通电子继电器总厂有限公司 | Operational amplifier constant current driving circuit based on solid-state power controller |
| CN117081514A (en) * | 2023-08-29 | 2023-11-17 | 宁波知音音响设备有限公司 | Power supply system of digital audio power amplifier |
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