CN103730831A - Constant power laser output control system and method - Google Patents

Constant power laser output control system and method Download PDF

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Publication number
CN103730831A
CN103730831A CN201310710757.5A CN201310710757A CN103730831A CN 103730831 A CN103730831 A CN 103730831A CN 201310710757 A CN201310710757 A CN 201310710757A CN 103730831 A CN103730831 A CN 103730831A
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amplifier
laser diode
output
power
laser
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CN103730831B (en
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蔡泳
陶世宏
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CHONGQING NANFANG NUMERICAL CONTROL EQUIPMENT Co Ltd
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CHONGQING NANFANG NUMERICAL CONTROL EQUIPMENT Co Ltd
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Abstract

The invention discloses a constant power laser output control system and method and belongs to the field of laser control. The constant power laser output control system comprises a processor, a laser diode drive circuit, a laser diode, a power-voltage converter, an in-phase proportional amplifier, an anti-phase proportional amplifier and a summation and integral amplifier. The processor is connected with the laser diode drive circuit in double directions. The output end of the laser diode drive circuit is connected with the input end of the laser diode. The output end of the processor is connected with the signal input end of the anti-phase proportional amplifier. The output end of the anti-phase proportional amplifier is connected with the first input end of the summation and integral amplifier. The signal output end of the power-voltage converter is connected with the signal input end of the in-phase proportional amplifier. The output end of the in-phase proportional amplifier is connected with the second input end of the summation and integral amplifier. The output end of the summation and integral amplifier is connected with the first input end of the laser diode drive circuit. According to the constant power laser output control system and method, output of the constant power is ensured, control of a true fully-sealed system is achieved, the monitoring precision is improved at the same time, and in addition, the service life of the laser diode is prolonged.

Description

Firm power Laser output control system and method
Technical field
The invention belongs to laser controlling field, particularly relate to a kind of firm power Laser output control system and method.
Background technology
In recent years, laser demonstration system was used widely at aspects such as industry, amusements.Existing laser system utilizes laser diode as light emitting source, by laser controller, controls, and during use, laser controller is controlled laser according to different types of control signal.Existing laser controller generally includes: analog signal control circuit, PWM (Pulse Width Modulation, pulse width modulation) signal control circuit, change over switch and constant-current control circuit.Analog signal control circuit is for the analog control signal of receiving computer control system output, and pwm signal control circuit is for the pwm control signal of receiving computer control system output; Change over switch is wherein manual change over switch, by operating personnel, manually operated as required, select analog control signal or pwm control signal, this analog control signal or pwm control signal are exported to laser after constant-current control circuit is processed, thereby realize the control to laser, it needs artificial manually switching, and it is not quite convenient to use, structure is comparatively complicated, is unfavorable for user's use impression.
At present, known laser control method has the methods such as constant voltage, constant current, permanent power, stationary temperature, and first two weak effect is last a kind of expensive.Present permanent power method has static difference, non-closed-loop control, the incomplete defect of safeguard measure, and urgent need will be improved.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of Laser output control system that can obtain with closed-loop feedback firm power.
For achieving the above object, the invention provides a kind of firm power Laser output control system, comprise processor, laser diode driver circuit and laser diode, described processor is connected with described laser diode driver circuit is two-way, and the output of described laser diode driver circuit connects the input of described laser diode, the present invention also comprises power-electric pressure converter, in-phase proportion amplifier, anti-phase proportional amplifier and summation integral amplifier, the output of described processor connects the signal input part of anti-phase proportional amplifier, the output of described anti-phase proportional amplifier connects the first input end of described summation integral amplifier, described power-electric pressure converter receives the light signal that described laser diode sends, the signal output part of described power-electric pressure converter is understood the signal input part of described in-phase proportion amplifier, the output of described in-phase proportion amplifier connects the second input of described summation integral amplifier, the output of described summation integral amplifier connects the first input end of described laser diode driver circuit.
During use, laser diode driver circuit is for providing the operating current of laser diode, laser diode is for generation of laser, output power of laser diode increases with the operating current of laser diode, power-electric pressure converter converts thereof into voltage signal after receiving light signal, then send to in-phase proportion amplifier, in-phase proportion amplifier sends to summation integral amplifier after the voltage signal receiving is amplified, single-chip microcomputer output voltage signal is the setting signal as output firm power laser to anti-phase proportional amplifier, anti-phase proportional amplifier amplifies the voltage signal of single-chip microcomputer output and is anti-phase, then send to described summation integral amplifier, the output voltage of described summation integral amplifier to in-phase proportion amplifier and anti-phase proportional amplifier output voltage sue for peace integral operation output voltage signal to described laser diode driver circuit to control the power of laser diode.Adopt above technical scheme can guarantee the output of firm power.Because feedback signal is taken from main optical path, reacted reliably in real time output power of laser diode situation of change, realized real closed loop system control.Above technical scheme has adopted independently power monitoring element, can improve monitoring precision.
Further, also comprise protective circuit; Described protective circuit comprises soft starting circuit, Schottky diode, overcurrent-overvoltage protecting circuit and closed type relay; The output of described overcurrent-overvoltage protecting circuit connects the input of described soft starting circuit, and the output of described soft starting circuit connects the second input of described laser diode driver circuit; It is in parallel that described Schottky diode and described laser diode are pressed opposite polarity, and the normally-closed contact of described closed type relay is in parallel with described laser diode.Adopt above technical scheme, very perfect safeguard measure is provided, guaranteed the safety of laser diode, extended greatly useful life.
Further, between described laser diode and described power-electric pressure converter, be also provided with spectroscope, the laser that described laser diode sends enters described power-electric pressure converter after spectroscope reflection.Due to the above technical scheme of Cai Yilin, feedback signal is taken from main optical path, has reacted reliably in real time output power of laser diode situation of change, has realized real closed loop system control.
Another technical problem that the present invention will solve is to provide a kind of control method that can obtain firm power Laser output.For achieving the above object, the invention provides a kind of firm power Laser output control method, comprise the following steps:
Step 1, laser diode driver circuit control laser diode send laser process spectroscope.
Step 2, power-electric pressure converter receive the laser through spectroscope reflection, and described power-electric pressure converter converts the reflection power receiving voltage Vr to and outputs to in-phase proportion amplifier and amplifies, and Vr is real number; Processor output voltage signal Vs amplifies also anti-phase to anti-phase proportional amplifier, Vs is real number.
Step 3, described in-phase proportion amplifier and anti-phase proportional amplifier respectively output voltage signal are given summation integral amplifier, the multiplication factor of setting described in-phase proportion amplifier is K, K>0, the integrating resistor of described summation integral amplifier is that the integrating capacitor of R, described summation integral amplifier is that the output voltage of C, described summation integral amplifier is V 0, calculate the output voltage of integral amplifier obtains suing for peace.
Step 4, described summation integral amplifier are by output voltage V 0send to described laser diode driver circuit.
The invention has the beneficial effects as follows: the present invention has guaranteed the output of firm power, simultaneously because feedback signal is taken from main optical path, reacted reliably in real time output power of laser diode situation of change, realized real closed loop system control.Above technical scheme has adopted independently power monitoring element, can improve monitoring precision, and the present invention also provides very perfect safeguard measure, has guaranteed the safety of laser diode, has extended greatly useful life.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the embodiment of the invention.
Fig. 2 is the schematic flow sheet of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " longitudinally ", " laterally ", " on ", orientation or the position relationship of the indication such as D score, 'fornt', 'back', " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than indicate or imply that the device of indication or element must have specific orientation, with specific orientation, construct and operation, therefore can not be interpreted as limitation of the present invention.
In description of the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, a kind of firm power Laser output control system, comprise processor 1, laser diode driver circuit 2, laser diode 3, power-electric pressure converter 4, in-phase proportion amplifier 5, anti-phase proportional amplifier 6 and summation integral amplifier 7, described processor 1 and described two-way connection of laser diode driver circuit 2, to carry out the working condition monitoring of laser diode, the output of described laser diode driver circuit 2 connects the input of described laser diode 3, the output of described processor 1 connects the signal input part of anti-phase proportional amplifier 6, the output of described anti-phase proportional amplifier 6 connects the first input end of described summation integral amplifier 7.Between described laser diode 3 and described power-electric pressure converter 4, be also provided with spectroscope 9, the laser that described laser diode 3 sends enters described power-electric pressure converter 4 after spectroscope 9 reflections, described power-electric pressure converter 4 receives the light signal that described laser diode 3 sends, the signal output part of described power-electric pressure converter 4 is understood the signal input part of described in-phase proportion amplifier 5, the output of described in-phase proportion amplifier 5 connects the second input of described summation integral amplifier 7, the output of described summation integral amplifier 7 connects the first input end of described laser diode driver circuit 2.
The present invention also comprises protective circuit 8; described protective circuit 8 comprises soft starting circuit, Schottky diode, overcurrent-overvoltage protecting circuit and closed type relay; the output of described overcurrent-overvoltage protecting circuit connects the input of described soft starting circuit; the output of described soft starting circuit connects the second input of described laser diode driver circuit 2; it is in parallel that described Schottky diode and described laser diode are pressed opposite polarity, and the normally-closed contact of described closed type relay is in parallel with described laser diode 3.
As shown in Figure 2, firm power Laser output control method, comprises the following steps:
Step 1, laser diode driver circuit 2 are controlled laser diode 3 and are sent laser process spectroscope 9.
Step 2, power-electric pressure converter 4 receive the laser reflecting through spectroscope 9, and described power-electric pressure converter 4 converts the reflection power receiving voltage Vr to and outputs to in-phase proportion amplifier 5 and amplifies, and Vr is real number; Processor 1 output voltage signal Vs amplifies also anti-phase to anti-phase proportional amplifier 6, Vs is real number.
Step 3, described in-phase proportion amplifier 5 and anti-phase proportional amplifier 6 respectively output voltage signal are given summation integral amplifier 7, the multiplication factor of setting described in-phase proportion amplifier 5 is K, K>0, the integrating resistor of described summation integral amplifier 7 is that the integrating capacitor of R, described summation integral amplifier 7 is that the output voltage of C, described summation integral amplifier 7 is V0, calculates the output voltage of integral amplifier 7 obtains suing for peace.
Step 4, described summation integral amplifier 7 send to described laser diode driver circuit 2 to control laser diode Modulating Power by output voltage V 0.
In the present embodiment, spectroscope is divided into part reflection, a part of transmission two-way light path, if spectroscopical transmissivity is η, 0%< η <100%, spectroscopical transmission power is that Po, spectroscopical reflection power are Pr: Po=η * Pr/ (1-η); Because spectroscopical transmissivity η is a constant, as long as so controlled reflection power Pr, guaranteed that the stable of it also just guaranteed that transmission power Po's is stable, because feedback signal is taken from main optical path, react reliably in real time output power of laser diode situation of change, realized real closed loop system control.In the present embodiment, power-electric pressure converter is comprised of silicon photocell and operation amplifier circuit, power-electric pressure converter converts reflection power Pr to output voltage V r, Vr and Pr are linear: Vr=α * Pr, as long as after silicon photocell and operation amplifier circuit are selected, conversion coefficient α is exactly a constant, owing to adopting independently power monitoring element, can improve monitoring precision.The output voltage of setting described in-phase proportion amplifier is Vc1, by calculating Vc1=K*Vr, Vr is amplified to and needs level, then exports Vc1 to summation integral amplifier, adopts suitable level signal to be conducive to improve system accuracy.The output voltage of setting described anti-phase proportional amplifier is Vc2, anti-phase proportional amplifier is added to anti-phase proportional amplifier using the DAC end output voltage V s of single-chip microcomputer and amplifies also anti-phase as the setting signal of output firm power laser, if anti-phase proportional amplifier output voltage is Vc2, multiplication factor is still 1, Vc2=-Vs.Summation integral amplifier is for output voltage V c1 to in-phase proportion amplifier and the anti-phase proportional amplifier output voltage V c2 integral operation of suing for peace, if the integrating resistor of summation integral amplifier is that the integrating capacitor of R, summation integral amplifier is C, the output voltage of the integral amplifier of suing for peace is Vo:
Vo = - 1 RC &Integral; ( Vc 1 + Vc 2 ) dt = 1 RC &Integral; ( Vs - Vc 1 ) dt = 1 RC &Integral; ( Vs - K * Vr ) dt ; Vo is used as control signal and delivers to laser diode driver circuit, as long as K*Vr is not equal to Vs, summation integral amplifier will change K*Vr by regulation output voltage Vo, until K*Vr=Vs.For example: if K*Vr<Vs shows that laser power is lower than setting power, Vo will increase, the electric current I d that supplies with laser diode will increase, and the power output of laser diode also can increase, until K*Vr=Vs; If K*Vr>Vs, shows that laser power is higher than setting power, Vo will reduce, and the electric current I d that supplies with laser diode will reduce, and the power output of laser diode also can reduce, until K*Vr=Vs.During K*Vr=Vs, Vr depends on the setting signal Vs of laser power completely, so once the setting signal Vs of laser power definite rear Po, Pr can not change, reached the object of obtaining firm power Laser output.Because operational amplifier has open-loop gain more than 110db, summation integral amplifier guarantees that system becomes astatic system.
Make in this way, the protective circuit of realized the control of system closed-loop, system with no steady-state error, improving safeguard measure guarantees the safety of laser diode, and the precision and stability of system control all reaches 0.2% through actual measurement, than conventional method, improves 0.3%.
More than describe preferred embodiment of the present invention in detail.In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.

Claims (4)

1. a firm power Laser output control system, comprise processor (1), laser diode driver circuit (2) and laser diode (3), described processor (1) and two-way connection of described laser diode driver circuit (2), the output of described laser diode driver circuit (2) connects the input of described laser diode (3), it is characterized in that: also comprise power-electric pressure converter (4), in-phase proportion amplifier (5), anti-phase proportional amplifier (6) and summation integral amplifier (7), the output of described processor (1) connects the signal input part of anti-phase proportional amplifier (6), the output of described anti-phase proportional amplifier (6) connects the first input end of described summation integral amplifier (7), described power-electric pressure converter (4) receives the light signal that described laser diode (3) sends, the signal output part of described power-electric pressure converter (4) is understood the signal input part of described in-phase proportion amplifier (5), the output of described in-phase proportion amplifier (5) connects the second input of described summation integral amplifier (7), the output of described summation integral amplifier (7) connects the first input end of described laser diode driver circuit (2).
2. firm power Laser output control system as claimed in claim 1, is characterized in that: also comprise protective circuit (8); Described protective circuit (8) comprises soft starting circuit, Schottky diode, overcurrent-overvoltage protecting circuit and closed type relay; The output of described overcurrent-overvoltage protecting circuit connects the input of described soft starting circuit, and the output of described soft starting circuit connects the second input of described laser diode driver circuit (2); It is in parallel that described Schottky diode and described laser diode are pressed opposite polarity, and the normally-closed contact of described closed type relay is in parallel with described laser diode (3).
3. firm power Laser output control system as claimed in claim 1 or 2, it is characterized in that: between described laser diode (3) and described power-electric pressure converter (4), be also provided with spectroscope (9), the laser that described laser diode (3) sends enters described power-electric pressure converter (4) after spectroscope (9) reflection.
4. the firm power Laser output control method based on firm power Laser output control system claimed in claim 1, is characterized in that comprising the following steps:
Step 1, laser diode driver circuit (2) are controlled laser diode (3) and are sent laser process spectroscope (9);
Step 2, power-electric pressure converter (4) receive the laser through spectroscope (9) reflection, and described power-electric pressure converter (4) converts the reflection power receiving to voltage Vr and outputs to in-phase proportion amplifier (5) and amplifies, and Vr is real number; Processor (1) output voltage signal Vs amplifies also anti-phase to anti-phase proportional amplifier (6), Vs is real number;
Step 3, described in-phase proportion amplifier (5) and anti-phase proportional amplifier (6) respectively output voltage signal are given summation integral amplifier (7), the multiplication factor of setting described in-phase proportion amplifier (5) is K, K>0, the integrating resistor of described summation integral amplifier (7) is that the integrating capacitor of R, described summation integral amplifier (7) is that the output voltage of C, described summation integral amplifier (7) is V 0, calculate
Figure FDA0000442591190000021
the output voltage of integral amplifier (7) obtains suing for peace;
Step 4, described summation integral amplifier (7) are by output voltage V 0send to described laser diode driver circuit (2).
CN201310710757.5A 2013-12-20 2013-12-20 Firm power laser output control system and method Expired - Fee Related CN103730831B (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN108344804A (en) * 2018-02-28 2018-07-31 中国人民武装警察部队工程大学 A kind of large-scale component non-destructive testing laser ultrasonic detection device and detection method
CN110568820A (en) * 2018-06-06 2019-12-13 佛山市嘉实和生物科技有限公司 laser equipment control system and method
CN114661081A (en) * 2020-12-22 2022-06-24 深圳英集芯科技股份有限公司 Power supply soft start control circuit, control chip and control device

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CN114661081A (en) * 2020-12-22 2022-06-24 深圳英集芯科技股份有限公司 Power supply soft start control circuit, control chip and control device
CN114661081B (en) * 2020-12-22 2024-05-03 深圳英集芯科技股份有限公司 Power supply soft start control circuit, control chip and control device

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