CN106129794B - A kind of high stability laser beam generating circuit based on PID control - Google Patents
A kind of high stability laser beam generating circuit based on PID control Download PDFInfo
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- CN106129794B CN106129794B CN201610801058.5A CN201610801058A CN106129794B CN 106129794 B CN106129794 B CN 106129794B CN 201610801058 A CN201610801058 A CN 201610801058A CN 106129794 B CN106129794 B CN 106129794B
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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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0912—Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping
Abstract
A kind of high stability laser beam generating circuit based on PID control of the invention belongs to technical field of electronic equipment, structure has laser module (1), power control module (2) and temperature control modules (3), it is characterized in that, the power control module (2) is made of power setting module (21), power sampling module (22), PID arithmetic module (23), LD drive module (24) and overtemperature power-off modular (25).Stability of the present invention is high, has overtemperature power down function.
Description
Technical field
The invention belongs to technical field of electronic equipment, in particular to a kind of high stability laser based on PID control generates
Circuit.
Background technique
Optical fiber laser is good etc. with its Low threshold, high power, high light beam quality, good reliability, compact-sized and thermal diffusivity
Plurality of advantages, be widely used in laser fiber communication, laser space remote communication, industrial shipbuilding, automobile manufacture, laser engraving,
Laser marking, laser cutting, printing roller, metal and nonmetal drilling/cutting/welding (brazing, hardening, covering and depth weldering
Connect), military and national defense safety, the fields such as medical instrument instrument and equipment.Optical fiber laser is using rare earth-doped fiber as increasing
The laser of beneficial medium.Optical fiber laser is developed on the basis of fiber amplifier, by pumping source, rare earth doped light
Fine, three fundamental compositions of resonant cavity, its working principle is that: the photon on pumping wavelength that pumping source generates is doped optical fiber
It absorbs, rare earth element ion therein is made to transit to higher energy level, form population inversion；In condition that is spontaneous or being excited
Under, rare earth element ion returns to low-lying level by high level and releases the photon of corresponding energy simultaneously；In the light of optical fiber laser
The above process constitutes positive feedback in fine resonant cavity, to form laser generation output.
In optical fiber laser, it is necessary to provide energy by a laser beam generating circuit (pumping source) for entire optical fiber laser
Source, as the core of optical fiber laser, the most important technical indicator master of pumping source is the stability for exporting laser, various
In laser beam generating circuit, the system being made of butterfly laser module and current driver, temperature controller is due to its user
Just, feature-rich, stability is high, the advantages that being easily integrated is widely used, be this class with the immediate prior art of the present invention
The patent of invention " a kind of high stability pump source of optical fiber laser " that topic group was applied in 2014, application No. is
2014103102505, in the document, using butterfly laser module as light emitting source, by the very high constant-flow driver of stability and perseverance
Temperature controller carries out driving and temperature control to it, in addition to butterfly laser module carries out temperature control, to system other parts core device
Temperature control is carried out, effectively improve the stability of output laser, but there is also certain defects for the technology: one, driver is taken
Be common linear scale control mode, and butterfly laser module belongs to electro-optical conversioning device, conversion process output light
Signal and input electrical signal inevitably delay phenomenon, when needing frequently to change power, output power can not
Quickly and accurately with the variation of power on signal, or when change driving current, Output optical power can occur near target power
Oscillatory occurences；Two, there is no overtemperature prote measure in system, once the heat that butterfly laser module generates exceeds the control of temperature controller
When warm ability or temperature controller break down, laser temperature can be steeply risen, it is easy to burn out butterfly laser module.It is based on
Above situation, at present in laser generation circuit, the further solution also in need especially in terms of stability and safety
The problem of.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the shortcomings of in background technique, provide a kind of high stability, high safety
The laser beam generating circuit of property.
Technical problem of the invention solves by the following technical programs:
A kind of high stability laser beam generating circuit based on PID control, structure have laser module 1, power control module 2
With temperature control modules 3, which is characterized in that the power control module 2 is by power setting module 21, power sampling module
22, PID arithmetic module 23, LD drive module 24 and overtemperature power-off modular 25 are constituted；
The structure of the power setting module 21 is a termination power VCC of resistance R1, another termination zener diode
The cathode of D1 and one end of slide rheostat W1, the anode of zener diode D1 and the other end ground connection of slide rheostat W1, it is sliding
One end of the slip terminating resistor R2 of dynamic rheostat W1, the non-inverting input terminal of another termination amplifier U1A of resistance R2, amplifier U1A
Anti-phase input terminating resistor R3 one end and resistance R4 one end, export the other end of terminating resistor R4, and set as power
The output end for setting module 21, is denoted as port P_set, the other end ground connection of resistance R3, and the positive and negative power end of amplifier U1A connects respectively
Power supply VCC and ground；
The structure of the power sampling module 22 is the non-inverting input terminal of a termination amplifier U1B of resistance R5, and conduct
One input terminal of power sampling module 22, is connected with the port PD+ of laser module 1, another termination amplifier U2A of resistance R5
Non-inverting input terminal, and another input terminal as power sampling module 22 is connected with the port PD- of laser module 1, transports
Put output of the output end of the inverting input terminal of U1B and the indirect resistance R6 of output end, amplifier U1B as power sampling module 22
End, is denoted as port P_F, one end of the inverting input terminal of amplifier U1B also one end of connecting resistance R7 and resistance R8, resistance R8's is another
The inverting input terminal of one end of terminating resistor R9, one end of resistance R10 and amplifier U2A, the other end ground connection of resistance R10, resistance
The output end of another termination amplifier U2A of the other end and resistance R9 of R7, the positive and negative power end of amplifier U2A meet power supply VCC respectively
With power supply VEE；
The structure of the PID arithmetic module 23 is the inverting input terminal of a termination amplifier U2B of resistance R11, the other end
As the feedback input end of PID arithmetic module 23, be denoted as port P_F_in, and with the port P_F phase in power sampling module 22
Even, the non-inverting input terminal of a termination amplifier U2B of resistance R12, setting input terminal of the other end as PID arithmetic module 23, note
For port P_set_in, and it is connected with the port P_set in power setting module 21, the non-inverting input terminal of amplifier U2B passes through electricity
R14 ground connection is hindered, the output end of a termination amplifier U2B of the indirect resistance R13 of inverting input terminal and output end, resistance R15 are another
The inverting input terminal of amplifier U3A is terminated, the non-inverting input terminal of amplifier U3A is grounded by resistance R16, inverting input terminal and output end
Indirect resistance R17, one end of the output terminating resistor R18 of amplifier U3A, the reverse phase of another termination amplifier U4B of resistance R18 is defeated
Enter end；The output end of a termination amplifier U2B of resistance R19, the inverting input terminal of another termination amplifier U3B, the same phase of amplifier U3B
Input terminal is grounded by resistance R20, the indirect capacitor C1 of inverting input terminal and output end, exports one end of terminating resistor R21, electricity
Hinder the inverting input terminal of another termination amplifier U4B of R21；The output end of a termination amplifier U2B of resistance R22, another termination electricity
Hold one end of C2, one end of another termination capacitor C3 of capacitor C2, one end of resistance R24 and amplifier U4A inverting input terminal, electricity
Hold the output end of the other end of C3 and another termination amplifier U4A of resistance R24 and one end of resistance R25, amplifier U4A's is same mutually defeated
Enter end to be grounded by resistance R23, the inverting input terminal of another termination amplifier U4B of resistance R25；The non-inverting input terminal of amplifier U4B
It is grounded by resistance R27, the indirect resistance R26 of inverting input terminal and output end, output of the output end as PID arithmetic module 23
End, is denoted as port I_ctr；The positive supply termination power VCC of amplifier U3A and amplifier U4A, negative supply termination power VEE；
The structure of the LD drive module 24 is the non-inverting input terminal of a termination amplifier U5B of resistance R28, the other end
As the current control input terminal of LD drive module 24, it is denoted as port I_ctr_in, and the port I_ with PID arithmetic module 24
Ctr is connected, and overtemperture control input terminal of the non-inverting input terminal of amplifier U5B as LD drive module 24 is denoted as port Alert_
Ctr_in, and be connected with the port Alert_ctr of overtemperature power-off modular 25, between the inverting input terminal and output end of amplifier U5B
Meet capacitor C4, one end of inverting input terminal also one end of connecting resistance R29 and resistance R30, another termination power VCC of resistance R29,
One end of another termination adjustable resistance W2 of resistance R30 and the output end of amplifier U5A, another terminating resistor of adjustable resistance W2
One end of R31, the inverting input terminal of another termination amplifier U5A of resistance R31, the non-inverting input terminal and anti-phase input of amplifier U5A
End is connected with one end of one end of resistance R32 and resistance R33 respectively, one end of another terminating resistor Rs1 of resistance R32 and field effect
Should pipe Q1 source electrode, the other end of another terminating resistor Rs1 of resistance R33 also connects the port LD+ of laser module 1, field-effect
The drain electrode of pipe Q1 meets power supply VCC, and grid connects the output end of amplifier U5B, the positive and negative power end of amplifier U5A connect respectively power supply VCC and
Ground；
The structure of the overtemperature power-off modular 25 is termination power a VCC, another termination triode Q2 of resistance R34
Base stage, and the input terminal as overtemperature power-off modular 25 connects the port NTC+ of laser module 1, the collector of triode Q2
Connect the base stage of triode Q3 and one end of resistance R35, the emitter of triode Q2 connects the emitter and resistance R39 of triode Q3
One end, the other end ground connection of resistance R39, one end of another termination adjustable resistance W3 of resistance R35, the other end of adjustable resistance W3
Connect power supply VCC, one end of the collector connecting resistance R36 of triode Q3 and one end of resistance R37, another termination electricity of resistance R36
The base stage of another termination triode Q4 of source VCC, resistance R37, the emitter of triode Q4 meet power supply VCC, and collector sweeps resistance
One end of R38 and the grid of field-effect tube Q5, the other end ground connection of resistance R38, the source electrode ground connection of field-effect tube Q5, drain conduct
The output end of overtemperature power-off modular 25 is denoted as port Alert_ctr, meets the port Alert_ctr_in of LD drive module 24, institute
The triode Q2 and triode Q3 stated is NPN type triode, and triode Q4 is PNP type triode.
In a kind of high stability laser beam generating circuit based on PID control of the invention, used in power control module 2
The preferred parameter of each device is resistance R1:9.1k Ω, and resistance R2~resistance R4 is 10k Ω, resistance R5:1.5k Ω, resistance
R6, resistance R7, resistance R9, resistance R10 are 180k Ω, and resistance R8:20k Ω, resistance R11~resistance R16 are 10k Ω, electricity
R17:20k Ω is hindered, resistance R18:10k Ω, resistance R19, resistance R20 are 20k Ω, resistance R21:10k Ω, resistance R22:200k
Ω, resistance R23:150k Ω, resistance R24:180k Ω, resistance R25~resistance R28 are 10k Ω, resistance R29:1M Ω, resistance
R30:10k Ω, resistance 31:200k Ω, resistance R32~resistance R34 are 10k Ω, resistance R35:200k Ω, resistance R36:100k
Ω, resistance R37:20k Ω, resistance R38, resistance R39 are 10k Ω, resistance Rs1:0.1 Ω, slide rheostat W1:10k Ω, can
Resistance W2:200k Ω is adjusted, adjustable resistance W3:100k Ω, capacitor C1, capacitor C2 are 1uF, capacitor C3:22pF, capacitor C4:
0.47uF, zener diode D1:2.5V, field-effect tube Q1:IRF540, field-effect tube Q5:k1482, triode Q2, triode Q3
It is two works that 2N3904, triode Q4:2N3906, amplifier U1A and amplifier U1B are the integrated double operationals of model LM358P
Make unit, amplifier U2A and amplifier U2B are two working cells of the integrated double operational of second model LM358P, amplifier U3A
It is two working cells of the integrated double operational of third model LM358P with amplifier U3B, amplifier U4A and amplifier U4B are
Two working cells of the integrated double operational of four model LM358P, amplifier U5A and amplifier U5B are the 5th models
Two working cells of the integrated double operational of LM358P, power supply VCC are+12V, and power supply VEE is -12V.
In a kind of high stability laser beam generating circuit based on PID control of the invention, the laser module 1 is preferred
JDI LC96 butterfly encapsulated laser module.
In a kind of high stability laser beam generating circuit based on PID control of the invention, the temperature control modules 3 are
The prior art can be able to achieve temperature controlled circuit composition with any, see also Chinese patent CN2007100559129 (height
Stability constant temperature controller) or Chinese patent CN2010102701027 (the wide power power consumption limit type perseverance based on thermoelectric cooler
Temperature controller) in design.
The utility model has the advantages that
1, the present invention joined PID arithmetic circuit in power control module and control driving current, can effectively mention
The stability of high Output optical power, and effectively prevent the oscillatory occurences of the Output optical power when changing driving current.
2, the present invention joined overtemperature power-off control circuit in power control module, when the operating temperature of laser module
More than setting early warning temperature when can automatically cut off driving current, effectively prevent due to operating temperature it is excessively high caused by laser die
Block damage, improves the safety of system.
Detailed description of the invention:
Fig. 1 is a kind of whole functional block diagram of the high stability laser beam generating circuit based on PID control of the present invention.
Fig. 2 is encapsulation and the pin schematic diagram of laser module used in the present invention.
Fig. 3 is the basic circuit diagram of power setting module 21.
Fig. 4 is the basic circuit diagram of power sampling module 22.
Fig. 5 is the basic circuit diagram of PID arithmetic module 23.
Fig. 6 is the basic circuit diagram of LD drive module 24.
Fig. 7 is the basic circuit diagram of overtemperature power-off modular 25.
Specific embodiment
With reference to the accompanying drawing, illustrate the specific structure and working principle of each section circuit of the present invention.Marked parameter in attached drawing
For the preferred circuit parameter of each embodiment.
1 overall system architecture of embodiment
As shown in Figure 1, system structure has laser module 1, power control module 2 and temperature control modules 3, the function
Rate control module 2 is broken by power setting module 21, power sampling module 22, PID arithmetic module 23, LD drive module 24 and overtemperature
Electric module 25 is constituted, and power control module 2 is connected with laser module 1 with temperature control modules 3, power control module 2 to
Laser module 1 provides driving current, the size of Output optical power is controlled by the size of driving current, by power setting module
Power needed for 21 settings (exports) in the form of voltage, and power sampling module 22 passes through photoelectricity two integrated in laser module 1
Pole pipe (PD) is sampled to Output optical power and is converted into voltage, and the voltage being then arranged with power setting module 21 is in PID
It carries out seeking difference in computing module 23 and carries out PID arithmetic, the result of operation is output to LD drive module 24 and controls it and is output to
The driving current of laser module 1, and then the Output optical power of laser module 1 is controlled, due to the automatic control of PID arithmetic module
Production is used, and Output optical power accurately, is quickly and stably become according to power set by power setting module 21
Change, while overtemperature power-off modular 25 passes through thermistor (NTC) integrated in laser module 1 to the work temperature of laser module
Degree is monitored, and when temperature is more than safe temperature, overtemperature power-off modular 25 can export a control signal, by LD drive module
24 shutdowns, at this point, no matter the power that power setting module 21 is arranged is how many, LD drive module 24 is not to laser module 1
Output driving current, temperature control modules 3 are responsible for the operating temperature of control laser module.
2 laser module of embodiment
The laser module 1 of the present embodiment selects JDI LC96 butterfly encapsulated laser module, and encapsulation and pin show
Be intended to as shown in Fig. 2, the laser module be internally integrated laser diode LD, photodiode PD, thermoelectric cooler TEC and
Thermistor NTC, the module share 14 pins, wherein 6 feet, 7 feet, 8 feet, 9 feet, 12 feet are sky pin (NC), 1 foot and 14
Foot is that two current input terminals (port TEC+ and port TEC-) of internal thermoelectric cooler are used for and temperature control modules 3 respectively
Current output terminal mouth be connected, 2 feet and 5 feet are two Wiring ports (port NTC+ and ports for being internally integrated thermistor
NTC-), it is connected for the thermistor input terminal with temperature control modules 3, port NTC+ is also defeated with overtemperature power-off modular 25
Enter end to be connected, 3 feet and 4 feet are two Wiring ports (port PD+ and port PD-) for being internally integrated photodiode, this two end
The size of current of mouth output has reacted the size of optical power, this Two-port netwerk is connected with two input terminals of power sampling module, uses
In Output optical power is converted into voltage signal, 10 feet and 11 feet be inner laser diode anode and cathode (port LD+ and
Port LD-), middle port LD- ground connection, port LD+ is connected with the output end of LD drive module 24, inside by LD drive module 24
The integrated laser diode in portion provides driving current and controls its Output optical power, and 13 feet are earthing of casing end.
3 temperature control module of embodiment
Temperature control modules 3 of the present invention are the prior art, specifically refer to applicant seminar previous application
Chinese patent CN2007100559129 (high-stability thermostatic controller) or Chinese patent CN2010102701027 (are based on thermoelectricity
The wide power power consumption limit type constant temperature controller of refrigerator) in design, temperature control modules 3 have one group of current output terminal, use
Freezed or heated in driving thermoelectric cooler, there are also one group of thermistor input terminals for temperature control modules 3, for connecting heat
Quick resistance, and the change in resistance of thermistor (variation of the reacting condition temperature of resistance value) is converted into voltage change and feeds back to temperature
It is temperature automatically controlled to realize to spend control module 3.
4 power setting module of embodiment
As shown in figure 3, the structure of the power setting module 21 is, and a termination power VCC of resistance R1, another termination
The cathode of zener diode D1 and one end of slide rheostat W1, the anode of zener diode D1 and slide rheostat W1's is another
End ground connection, one end of the slip terminating resistor R2 of slide rheostat W1, the homophase input of another termination amplifier U1A of resistance R2
End, one end of the anti-phase input terminating resistor R3 of amplifier U1A and one end of resistance R4 export the other end of terminating resistor R4, and
As the output end of power setting module 21, it is denoted as port P_set, the other end ground connection of resistance R3, the positive and negative electricity of amplifier U1A
Source connects power supply VCC and ground respectively；By the settable required voltage output of slide rheostat W1 in the module, and then control
Final Output optical power.
5 power sampling module of embodiment
As shown in figure 4, the structure of the power sampling module 22 is, a termination amplifier U1B's of resistance R5 is same mutually defeated
Enter end, and an input terminal as power sampling module 22, is connected with the port PD+ of laser module 1, resistance R5's is another
Terminate the non-inverting input terminal of amplifier U2A, and another input terminal as power sampling module 22, the end with laser module 1
Mouth PD- is connected, the inverting input terminal of amplifier U1B and the indirect resistance R6 of output end, and the output end of amplifier U1B is sampled as power
The output end of module 22, is denoted as port P_F, one end of the inverting input terminal of amplifier U1B also one end of connecting resistance R7 and resistance R8,
The inverting input terminal of one end of another terminating resistor R9 of resistance R8, one end of resistance R10 and amplifier U2A, resistance R10's is another
End ground connection, the output end of another termination amplifier U2A of the other end and resistance R9 of resistance R7, the positive and negative power end point of amplifier U2A
Power supply VCC and power supply VEE are not met.The Output optical power of laser module 1 is converted into voltage signal by power sampling module 22.
Embodiment 6PID computing module
As shown in figure 5, the structure of the PID arithmetic module 23 is, the reverse phase of a termination amplifier U2B of resistance R11 is defeated
Enter end, feedback input end of the other end as PID arithmetic module 23 is denoted as port P_F_in, and in power sampling module 22
Port P_F be connected, the non-inverting input terminal of a termination amplifier U2B of resistance R12, the other end sets as PID arithmetic module 23
Input terminal is set, is denoted as port P_set_in, and be connected with the port P_set in power setting module 21, amplifier U2B's is same mutually defeated
Enter end to be grounded by resistance R14, a termination amplifier U2B's of the indirect resistance R13 of inverting input terminal and output end, resistance R15
Output end, the inverting input terminal of another termination amplifier U3A, the non-inverting input terminal of amplifier U3A are grounded by resistance R16, and reverse phase is defeated
Enter the indirect resistance R17 of end and output end, one end of the output terminating resistor R18 of amplifier U3A, another termination fortune of resistance R18
Put the inverting input terminal of U4B；The output end of a termination amplifier U2B of resistance R19, the inverting input terminal of another termination amplifier U3B,
The non-inverting input terminal of amplifier U3B is grounded by resistance R20, the indirect capacitor C1 of inverting input terminal and output end, output termination electricity
Hinder one end of R21, the inverting input terminal of another termination amplifier U4B of resistance R21；The output of a termination amplifier U2B of resistance R22
End, one end of another termination capacitor C2, one end of another termination capacitor C3 of capacitor C2, one end of resistance R24 and amplifier U4A
Inverting input terminal, the output end of another termination amplifier U4A of the other end and resistance R24 of capacitor C3 and one end of resistance R25, fortune
The non-inverting input terminal for putting U4A is grounded by resistance R23, the inverting input terminal of another termination amplifier U4B of resistance R25；Amplifier U4B
Non-inverting input terminal be grounded by resistance R27, the indirect resistance R26 of inverting input terminal and output end, output end is as PID arithmetic
The output end of module 23 is denoted as port I_ctr；The positive supply termination power VCC of amplifier U3A and amplifier U4A, negative supply termination electricity
Source VEE.The feedback voltage that the control voltage and power sampling module 22 of the output of power setting module 21 export is in PID arithmetic mould
Compare in block 23 and seek difference and carry out PID arithmetic, operation result is used to control the driving current of LD drive module.
Embodiment 7LD drive module
As shown in fig. 6, the structure of the LD drive module 24 is, the homophase input of a termination amplifier U5B of resistance R28
End, current control input terminal of the other end as LD drive module 24 are denoted as port I_ctr_in, and with PID arithmetic module 24
Port I_ctr be connected, overtemperture control input terminal of the non-inverting input terminal of amplifier U5B as LD drive module 24 is denoted as port
Alert_ctr_in, and be connected with the port Alert_ctr of overtemperature power-off modular 25, the inverting input terminal and output of amplifier U5B
The indirect capacitor C4 at end, one end of inverting input terminal also one end of connecting resistance R29 and resistance R30, another termination electricity of resistance R29
One end of another termination adjustable resistance W2 of source VCC, resistance R30 and the output end of amplifier U5A, another termination of adjustable resistance W2
One end of resistance R31, the inverting input terminal of another termination amplifier U5A of resistance R31, the non-inverting input terminal and reverse phase of amplifier U5A
Input terminal is connected with one end of one end of resistance R32 and resistance R33 respectively, one end of another terminating resistor Rs1 of resistance R32 and
The source electrode of field-effect tube Q1, the other end of another terminating resistor Rs1 of resistance R33, also connects the port LD+ of laser module 1, field
The drain electrode of effect pipe Q1 meets power supply VCC, and grid connects the output end of amplifier U5B, and the positive and negative power end of amplifier U5A connects power supply respectively
VCC and ground.LD drive module 24 is controlled by the voltage that PID arithmetic module exports, and driving current is generated, for controlling laser die
The Output optical power of block 1.
8 overtemperature power-off modular of embodiment
As shown in fig. 7, the structure of the overtemperature power-off modular 25 is, and a termination power VCC of resistance R34, the other end
The base stage of triode Q2, and the input terminal as overtemperature power-off modular 25 are connect, the port NTC+ of laser module 1, triode are connect
The base stage of the collector connecting transistor Q3 of Q2 and one end of resistance R35, the emitter of triode Q2 connect the emitter of triode Q3
It is grounded with the other end of one end of resistance R39, resistance R39, one end of another termination adjustable resistance W3 of resistance R35, adjustable electric
Hinder another termination power VCC of W3, one end of the collector connecting resistance R36 of triode Q3 and one end of resistance R37, resistance R36
Another termination power VCC, the base stage of another termination triode Q4 of resistance R37, the emitter of triode Q4 meets power supply VCC,
Collector sweeps one end of resistance R38 and the grid of field-effect tube Q5, the other end ground connection of resistance R38, the source electrode of field-effect tube Q5
Ground connection, the output end to drain as overtemperature power-off modular 25, is denoted as port Alert_ctr, connects the port of LD drive module 24
Alert_ctr_in, the triode Q2 and triode Q3 are NPN type triode, and triode Q4 is PNP type triode.Overtemperature
The port NTC+ of the input termination laser module 1 of power-off modular 25, for the voltage of monitoring port NTC+, due to laser die
What is integrated in block 1 is the thermistor of negative temperature coefficient, therefore when temperature is lower, resistance value is higher, the voltage of port NTC+
Height, triode Q2 is connected at this time, and triode Q3 and triode Q4 cut-off, the grid of field-effect tube Q5 is low level, field-effect tube
Q5 cut-off, overtemperature power-off modular 25 entire in this way is the equal of disconnecting from LD drive module 24, does not influence LD drive module 24
Normal work；When temperature is increased to early warning temperature (being set by adjustable resistance W3) of setting, the voltage of port NTC+ declines
To the blanking voltage of triode Q2, so that triode Q2 ends, triode Q3 and triode Q4 conducting, field-effect tube Q5 grid electricity
Pressure switchs to high level, and field-effect tube Q5 conducting, the current potential of port Alert_ctr is approximately 0, and the port is by LD drive module 24
The control voltage of input terminal is fixed to 0, therefore will not generate electric current output, so that the driving current of laser module 1 has been cut off,
When temperature comes back in safe range, can just rework.Due to R35+W3 > R36, which has
Certain return difference characteristic will not restore driving electricity after there is overtemperature power-off at once when operating temperature is returned to lower than alarm temperature
Stream, but driving current could be restored by needing operating temperature to drop to a lower value.
Claims (3)
1. a kind of high stability laser beam generating circuit based on PID control, structure have laser module (1), power control module
(2) and temperature control modules (3), which is characterized in that the power control module (2) is by power setting module (21), power
Sampling module (22), PID arithmetic module (23), LD drive module (24) and overtemperature power-off modular (25) are constituted；
The structure of the power setting module (21) is termination power a VCC, another termination zener diode D1 of resistance R1
Cathode and slide rheostat W1 one end, the other end ground connection of the anode of zener diode D1 and slide rheostat W1, sliding
One end of the slip terminating resistor R2 of rheostat W1, the non-inverting input terminal of another termination amplifier U1A of resistance R2, amplifier U1A's
One end of anti-phase input terminating resistor R3 and one end of resistance R4 export the other end of terminating resistor R4, and as power setting
The output end of module (21), is denoted as port P_set, the other end ground connection of resistance R3, and the positive and negative power end of amplifier U1A connects respectively
Power supply VCC and ground；
The structure of the power sampling module (22) is the non-inverting input terminal of a termination amplifier U1B of resistance R5, and as function
One input terminal of rate sampling module (22), is connected with the port PD+ of laser module (1), another termination amplifier of resistance R5
The non-inverting input terminal of U2A, and another input terminal as power sampling module (22), the port PD- with laser module (1)
It is connected, the inverting input terminal of amplifier U1B and the indirect resistance R6 of output end, the output end of amplifier U1B is as power sampling module
(22) output end is denoted as port P_F, one end of the inverting input terminal of amplifier U1B also one end of connecting resistance R7 and resistance R8, electricity
Hinder one end of another terminating resistor R9 of R8, the inverting input terminal of one end of resistance R10 and amplifier U2A, the other end of resistance R10
Ground connection, the output end of another termination amplifier U2A of the other end and resistance R9 of resistance R7, the positive and negative power end difference of amplifier U2A
Meet power supply VCC and power supply VEE；
The structure of the PID arithmetic module (23) is that the inverting input terminal of a termination amplifier U2B of resistance R11, the other end is made
For the feedback input end of PID arithmetic module (23), be denoted as port P_F_in, and with the port P_F in power sampling module (22)
It is connected, the non-inverting input terminal of a termination amplifier U2B of resistance R12, the other end is inputted as the setting of PID arithmetic module (23)
End, is denoted as port P_set_in, and be connected with the port P_set in power setting module (21), the non-inverting input terminal of amplifier U2B
It is grounded by resistance R14, the output of a termination amplifier U2B of the indirect resistance R13 of inverting input terminal and output end, resistance R15
End, the inverting input terminal of another termination amplifier U3A, the non-inverting input terminal of amplifier U3A are grounded by resistance R16, inverting input terminal
With the indirect resistance R17 of output end, one end of the output terminating resistor R18 of amplifier U3A, another termination amplifier U4B of resistance R18
Inverting input terminal；The output end of a termination amplifier U2B of resistance R19, the inverting input terminal of another termination amplifier U3B, amplifier
The non-inverting input terminal of U3B is grounded by resistance R20, the indirect capacitor C1 of inverting input terminal and output end, exports terminating resistor R21
One end, the inverting input terminal of another termination amplifier U4B of resistance R21；The output end of a termination amplifier U2B of resistance R22, separately
One end of one termination capacitor C2, one end of another termination capacitor C3 of capacitor C2, one end of resistance R24 and amplifier U4A reverse phase
Input terminal, the output end of another termination amplifier U4A of the other end and resistance R24 of capacitor C3 and one end of resistance R25, amplifier
The non-inverting input terminal of U4A is grounded by resistance R23, the inverting input terminal of another termination amplifier U4B of resistance R25；Amplifier U4B's
Non-inverting input terminal is grounded by resistance R27, and the indirect resistance R26 of inverting input terminal and output end, output end is as PID arithmetic mould
The output end of block (23), is denoted as port I_ctr；The positive supply termination power VCC of amplifier U3A and amplifier U4A, negative supply termination electricity
Source VEE；
The structure of the LD drive module (24) is that the non-inverting input terminal of a termination amplifier U5B of resistance R28, the other end is made
For the current control input terminal of LD drive module (24), it is denoted as port I_ctr_in, and the port I_ with PID arithmetic module (24)
Ctr is connected, and overtemperture control input terminal of the non-inverting input terminal of amplifier U5B as LD drive module (24) is denoted as port Alert_
The inverting input terminal and output end of ctr_in, and being connected with the port Alert_ctr of overtemperature power-off modular (25), amplifier U5B it
Indirect capacitor C4, one end of inverting input terminal also one end of connecting resistance R29 and resistance R30, another termination power of resistance R29
One end of another termination adjustable resistance W2 of VCC, resistance R30 and the output end of amplifier U5A, another termination electricity of adjustable resistance W2
One end of resistance R31, the inverting input terminal of another termination amplifier U5A of resistance R31, the non-inverting input terminal and reverse phase of amplifier U5A are defeated
Enter end to be connected with one end of one end of resistance R32 and resistance R33 respectively, one end and field of another terminating resistor Rs1 of resistance R32
The source electrode of effect pipe Q1, the other end of another terminating resistor Rs1 of resistance R33, also connects the port LD+ of laser module (1), field
The drain electrode of effect pipe Q1 meets power supply VCC, and grid connects the output end of amplifier U5B, and the positive and negative power end of amplifier U5A connects power supply respectively
VCC and ground；
The structure of the overtemperature power-off modular (25) is a termination power VCC of resistance R34, another termination triode Q2's
Base stage, and the input terminal as overtemperature power-off modular (25) connect the port NTC+ of laser module (1), the current collection of triode Q2
Pole connects the base stage of triode Q3 and one end of resistance R35, and the emitter of triode Q2 connects the emitter and resistance R39 of triode Q3
One end, resistance R39 the other end ground connection, one end of another termination adjustable resistance W3 of resistance R35, adjustable resistance W3's is another
One end of the collector connecting resistance R36 of termination power VCC, triode Q3 and one end of resistance R37, another termination of resistance R36
The base stage of another termination triode Q4 of power supply VCC, resistance R37, the emitter of triode Q4 meet power supply VCC, and collector sweeps electricity
Hinder one end of R38 and the grid of field-effect tube Q5, the other end ground connection of resistance R38, the source electrode ground connection of field-effect tube Q5, drain electrode work
For the output end of overtemperature power-off modular (25), it is denoted as port Alert_ctr, meets the port Alert_ctr_ of LD drive module (24)
In, the triode Q2 and triode Q3 are NPN type triode, and triode Q4 is PNP type triode.
2. a kind of high stability laser beam generating circuit based on PID control according to claim 1, which is characterized in that function
The parameter of each device used in rate control module (2) is that resistance R1:9.1k Ω, resistance R2~resistance R4 is 10k Ω, electricity
R5:1.5k Ω is hindered, resistance R6, resistance R7, resistance R9, resistance R10 are 180k Ω, resistance R8:20k Ω, resistance R11~resistance
R16 is 10k Ω, resistance R17:20k Ω, and resistance R18:10k Ω, resistance R19, resistance R20 are 20k Ω, resistance R21:10k
Ω, resistance R22:200k Ω, resistance R23:150k Ω, resistance R24:180k Ω, resistance R25~resistance R28 are 10k Ω, electricity
R29:1M Ω, resistance R30:10k Ω, resistance 31:200k Ω are hindered, resistance R32~resistance R34 is 10k Ω, resistance R35:200k
Ω, resistance R36:100k Ω, resistance R37:20k Ω, resistance R38, resistance R39 are 10k Ω, resistance Rs1:0.1 Ω, and sliding becomes
Device W1:10k Ω is hindered, adjustable resistance W2:200k Ω, adjustable resistance W3:100k Ω, capacitor C1, capacitor C2 are 1uF, capacitor C3:
22pF, capacitor C4:0.47uF, zener diode D1:2.5V, field-effect tube Q1:IRF540, field-effect tube Q5:k1482, three poles
Pipe Q2, triode Q3 are that 2N3904, triode Q4:2N3906, amplifier U1A and amplifier U1B are the integrated of model LM358P
Two working cells of double operational, amplifier U2A and amplifier U2B are two works of the integrated double operational of second model LM358P
Make unit, amplifier U3A and amplifier U3B are two working cells of the integrated double operational of third model LM358P, amplifier U4A
It is two working cells of the integrated double operational of the 4th model LM358P with amplifier U4B, amplifier U5A and amplifier U5B are
Two working cells of the integrated double operational of five model LM358P, power supply VCC are+12V, and power supply VEE is -12V.
3. feature exists in a kind of high stability laser beam generating circuit based on PID control according to claim 1 or 2
In the laser module (1) is JDI LC96 butterfly encapsulated laser module.
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| CN109217099B (en) * | 2018-10-31 | 2021-06-01 | 威海北洋电气集团股份有限公司 | Temperature control circuit of DFB laser |
| CN114336258B (en) * | 2021-12-31 | 2023-09-08 | 武汉锐科光纤激光技术股份有限公司 | Method and device for controlling power of light beam, storage medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554478A (en) * | 2011-12-25 | 2012-07-11 | 深圳市大族激光科技股份有限公司 | Control device and control method for power of high-speed laser |
| CN103414103A (en) * | 2013-08-16 | 2013-11-27 | 中国科学院半导体研究所 | Driving power supply device of parallel connection expansion high-power all-solid-state laser |
| CN103701033A (en) * | 2013-11-26 | 2014-04-02 | 上海华魏光纤传感技术有限公司 | Work protection system for DFB (distributed feed back) laser |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554478A (en) * | 2011-12-25 | 2012-07-11 | 深圳市大族激光科技股份有限公司 | Control device and control method for power of high-speed laser |
| CN103414103A (en) * | 2013-08-16 | 2013-11-27 | 中国科学院半导体研究所 | Driving power supply device of parallel connection expansion high-power all-solid-state laser |
| CN103701033A (en) * | 2013-11-26 | 2014-04-02 | 上海华魏光纤传感技术有限公司 | Work protection system for DFB (distributed feed back) laser |
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