CN103730831B - Firm power laser output control system and method - Google Patents
Firm power laser output control system and method Download PDFInfo
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- CN103730831B CN103730831B CN201310710757.5A CN201310710757A CN103730831B CN 103730831 B CN103730831 B CN 103730831B CN 201310710757 A CN201310710757 A CN 201310710757A CN 103730831 B CN103730831 B CN 103730831B
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Abstract
The invention discloses a kind of firm power laser output control system and method, belong to laser controlling field, including processor, laser diode driver circuit, laser diode, power vs. voltage transducer, in-phase proportion amplifier, anti-phase proportional amplifier and summation integral amplifier；Processor and laser diode driver circuit are bi-directionally connected, and the outfan of laser diode driver circuit connects the input of laser diode；The outfan of processor connects the signal input part of anti-phase proportional amplifier, the outfan of anti-phase proportional amplifier connects the first input end of summation integral amplifier, the signal output part of power vs. voltage transducer understands the signal input part of in-phase proportion amplifier, the outfan of in-phase proportion amplifier connects the second input of summation integral amplifier, and the outfan of summation integral amplifier connects the first input end of laser diode driver circuit.This invention ensures that the output of firm power, it is achieved that real closed loop system controls, and improves monitoring precision simultaneously, and extends the service life of laser diode.
Description
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 in industry, amusement etc..Existing laser system utilizes laser diode as luminous source, is controlled by laser controller, and during use, laser instrument is controlled by laser controller according to different types of control signal.Existing laser controller generally includes: analogue signal control circuit, PWM (PulseWidthModulation, pulse width modulation) signal control circuit, permutator and constant-current control circuit.Analogue signal control circuit is for receiving the analog control signal of computer control system output, and pwm signal control circuit is for receiving the pwm control signal of computer control system output；Permutator therein is manual permutator, operation it is performed manually by as required by operator, select analog control signal or pwm control signal, this analog control signal or pwm control signal export to laser instrument after constant-current control circuit processes, thus realizing the control to laser instrument, what its needs were artificial is performed manually by switching, uses little convenience, structure is complex, is unfavorable for that the use sense of user is subject to.
At present, known laser control method has the methods such as constant voltage, constant current, invariable power, stationary temperature, first two weak effect, and last one is expensive.Present invariable power method has static difference, non-full closed loop control, the incomplete defect of protective measure, and urgent need to be improved.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of laser output control system that can obtain firm power with closed-loop feedback.
For achieving the above object, the invention provides a kind of firm power laser output control system, including processor, laser diode driver circuit and laser diode, described processor and described laser diode driver circuit are bi-directionally connected, and the outfan of described laser diode driver circuit connects the input of described laser diode；Present invention additionally comprises power vs. voltage transducer, in-phase proportion amplifier, anti-phase proportional amplifier and summation integral amplifier；The outfan of described processor connects the signal input part of anti-phase proportional amplifier, the outfan of described anti-phase proportional amplifier connects the first input end of described summation integral amplifier, described power vs. voltage transducer receives the optical signal that described laser diode sends, the signal output part of described power vs. voltage transducer understands the signal input part of described in-phase proportion amplifier, the outfan of described in-phase proportion amplifier connects the second input of described summation integral amplifier, the outfan 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 used for producing laser, output power of laser diode increases with the operating current of laser diode and increases, power vs. voltage transducer converts thereof into voltage signal after receiving optical signal, it is then sent to in-phase proportion amplifier, in-phase proportion amplifier is sent to summation integral amplifier after being amplified by the voltage signal received, single-chip microcomputer output voltage signal to anti-phase proportional amplifier as output firm power laser setting signal, the voltage signal that single-chip microcomputer exports is amplified and anti-phase by anti-phase proportional amplifier, it is then sent to described summation integral amplifier, output voltage and the anti-phase proportional amplifier output voltage of in-phase proportion amplifier are carried out summation integral operation output voltage signal to described laser diode driver circuit to control the power of laser diode by described summation integral amplifier.Above technical scheme is adopted to ensure that the output of firm power.Owing to feedback signal is taken from main optical path, reliably react output power of laser diode situation of change in real time, it is achieved that real closed loop system controls.Above technical scheme have employed independent power monitoring element, it is possible to improves monitoring precision.
Further, protection circuit is also included；Described protection circuit includes soft starting circuit, Schottky diode, overcurrent-overvoltage protecting circuit and closed type relay；The outfan of described overcurrent-overvoltage protecting circuit connects the input of described soft starting circuit, and the outfan of described soft starting circuit connects the second input of described laser diode driver circuit；It is in parallel that described Schottky diode presses opposite polarity with described laser diode, the normally-closed contact of described closed type relay and described laser diodes in parallel.Adopt above technical scheme, it is provided that very perfect protective measure, it is ensured that the safety of laser diode, greatly extend service life.
Further, being additionally provided with spectroscope between described laser diode and described power vs. voltage transducer, the laser that described laser diode sends enters described power vs. voltage transducer after dichroic mirror.Due to more than Cai Yilin technical scheme, feedback signal is taken from main optical path, has reliably reacted output power of laser diode situation of change in real time, it is achieved that real closed loop system controls.
Another technical problem that the invention solves the problems that is to provide a kind of control method that can obtain the output of firm power laser.For achieving the above object, the invention provides a kind of firm power laser output control method, comprise the following steps:
Step one, laser diode driver circuit control laser diode and send laser and through spectroscope.
Step 2, power vs. voltage transducer receive the laser through dichroic mirror, and the reflection power received is converted to voltage Vr by described power vs. voltage transducer and output is amplified to in-phase proportion amplifier, and Vr is real number；Processor output voltage signal Vs is amplified and anti-phase to anti-phase proportional amplifier, and Vs is real number.
Step 3, described in-phase proportion amplifier and anti-phase proportional amplifier output voltage signal respectively gives summation integral amplifier, set the amplification of described in-phase proportion amplifier as K, K > 0, the integrating resistor of described summation integral amplifier be R, described summation integral amplifier integrating capacitor be C, described summation integral amplifier output voltage be V0, calculateObtain the output voltage of summation integral amplifier.
Step 4, described summation integral amplifier are by output voltage V0It is sent to described laser diode driver circuit.
The invention has the beneficial effects as follows: this invention ensures that the output of firm power, simultaneously because feedback signal is taken from main optical path, reliably reacted output power of laser diode situation of change in real time, it is achieved that real closed loop system controls.Above technical scheme have employed independent power monitoring element, it is possible to improves monitoring precision, present invention also offers very perfect protective measure, it is ensured that the safety of laser diode, greatly extend service 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.
Detailed description of the invention
Being described below in detail embodiments of the invention, 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 same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, and is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
In describing the invention, unless otherwise prescribed and limit, it should be noted that term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, can be mechanically connected or electrical connection, can also be the connection of two element internals, it is possible to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, it is possible to understand the concrete meaning of above-mentioned term as the case may be.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, including processor 1, laser diode driver circuit 2, laser diode 3, power vs. voltage transducer 4, in-phase proportion amplifier 5, anti-phase proportional amplifier 6 and summation integral amplifier 7, described processor 1 is bi-directionally connected with described laser diode driver circuit 2, to carry out the working condition monitoring of laser diode, the outfan of described laser diode driver circuit 2 connects the input of described laser diode 3, the outfan of described processor 1 connects the signal input part of anti-phase proportional amplifier 6, the outfan of described anti-phase proportional amplifier 6 connects the first input end of described summation integral amplifier 7.It is additionally provided with spectroscope 9 between described laser diode 3 and described power vs. voltage transducer 4, the laser that described laser diode 3 sends enters described power vs. voltage transducer 4 after spectroscope 9 reflects, described power vs. voltage transducer 4 receives the optical signal that described laser diode 3 sends, the signal output part of described power vs. voltage transducer 4 understands the signal input part of described in-phase proportion amplifier 5, the outfan of described in-phase proportion amplifier 5 connects the second input of described summation integral amplifier 7, the outfan of described summation integral amplifier 7 connects the first input end of described laser diode driver circuit 2.
Present invention additionally comprises protection circuit 8; described protection circuit 8 includes soft starting circuit, Schottky diode, overcurrent-overvoltage protecting circuit and closed type relay; the outfan of described overcurrent-overvoltage protecting circuit connects the input of described soft starting circuit; the outfan of described soft starting circuit connects the second input of described laser diode driver circuit 2; it is in parallel that described Schottky diode presses opposite polarity with described laser diode, and the normally-closed contact of described closed type relay is in parallel with described laser diode 3.
As in figure 2 it is shown, firm power laser output control method, comprise the following steps:
Step one, laser diode driver circuit 2 control laser diode 3 and send laser and through spectroscope 9.
Step 2, power vs. voltage transducer 4 receive the laser through spectroscope 9 reflection, and the reflection power received is converted to voltage Vr by described power vs. voltage transducer 4 and output is amplified to in-phase proportion amplifier 5, and Vr is real number；Processor 1 output voltage signal Vs is amplified and anti-phase to anti-phase proportional amplifier 6, and Vs is real number.
Step 3, described in-phase proportion amplifier 5 and anti-phase proportional amplifier 6 output voltage signal respectively gives summation integral amplifier 7, set the amplification of described in-phase proportion amplifier 5 as K, K > 0, the integrating resistor of described summation integral amplifier 7 be R, described summation integral amplifier 7 integrating capacitor be C, described summation integral amplifier 7 output voltage be V0, calculateObtain the output voltage of summation integral amplifier 7.
Output voltage V0 is sent to described laser diode driver circuit 2 and adjusts power to control laser diode by step 4, described summation integral amplifier 7.
In the present embodiment, spectroscope is divided into part reflection, a part of transmission two-way light path, if spectroscopical absorbance is η, and 0% < η < 100%, spectroscopical transmission power is Po, spectroscopical reflection power is Pr, then: Po=η * Pr/ (1-η)；Owing to spectroscopical absorbance η is a constant, as long as so controlling reflection power Pr, ensure that the stable of it also ensures that stablizing of transmission power Po, owing to feedback signal is taken from main optical path, reliably react output power of laser diode situation of change in real time, it is achieved that real closed loop system controls.In the present embodiment, power vs. voltage transducer is made up of silicon cell and operation amplifier circuit, reflection power Pr is converted to output voltage Vr by power vs. voltage transducer, Vr and Pr is linear: Vr=α * Pr, as long as after silicon cell and operation amplifier circuit are selected, conversion coefficient α is exactly a constant, owing to adopting independent power monitoring element, it is possible to improve monitoring precision.Setting the output voltage of described in-phase proportion amplifier as Vc1, by calculating Vc1=K*Vr, be amplified to by Vr and need level, then output Vc1 is to summation integral amplifier, adopts suitable level signal to be conducive to raising system accuracy.Set the output voltage of described anti-phase proportional amplifier as Vc2, the DAC end output voltage Vs of single-chip microcomputer is added to anti-phase proportional amplifier and amplifies and anti-phase as the setting signal exporting firm power laser by anti-phase proportional amplifier, if anti-phase proportional amplifier output voltage is Vc2, amplification remains as 1, then Vc2=-Vs.Summation integral amplifier for carrying out summation integral operation to the output voltage Vc1 and anti-phase proportional amplifier output voltage Vc2 of in-phase proportion amplifier, if the integrating resistor of summation integral amplifier is R, the integrating capacitor of integral amplifier of suing for peace is C, the output voltage of summation integral amplifier is Vo, then:
Make in this way, it is achieved that system full closed loop control, system with no steady-state error, improve protective measure protection circuit ensure laser diode safety, system control precision and stability through actual measurement all reach 0.2%, than traditional method improve 0.3%.
The preferred embodiment of the present invention described in detail above.In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: these embodiments can being carried out multiple change, amendment, replacement and modification when without departing from principles of the invention and objective, the scope of the present invention is limited by claim and equivalent thereof.
Claims (4)
1. a firm power laser output control system, including processor (1), laser diode driver circuit (2) and laser diode (3), described processor (1) and described laser diode driver circuit (2) are bi-directionally connected, and the outfan of described laser diode driver circuit (2) connects the input of described laser diode (3)；It is characterized in that: also include power vs. voltage transducer (4), in-phase proportion amplifier (5), anti-phase proportional amplifier (6) and summation integral amplifier (7)；The outfan of described processor (1) connects the signal input part of anti-phase proportional amplifier (6), the outfan of described anti-phase proportional amplifier (6) connects the first input end of described summation integral amplifier (7), described power vs. voltage transducer (4) receives the optical signal that described laser diode (3) sends, the signal output part of described power vs. voltage transducer (4) connects the signal input part of described in-phase proportion amplifier (5), the outfan of described in-phase proportion amplifier (5) connects the second input of described summation integral amplifier (7), the outfan 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 include protection circuit (8)；Described protection circuit (8) includes soft starting circuit, Schottky diode, overcurrent-overvoltage protecting circuit and closed type relay；The outfan of described overcurrent-overvoltage protecting circuit connects the input of described soft starting circuit, and the outfan of described soft starting circuit connects the second input of described laser diode driver circuit (2)；It is in parallel that described Schottky diode presses opposite polarity with described laser diode, 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: be additionally provided with spectroscope (9) between described laser diode (3) and described power vs. voltage transducer (4), the laser that described laser diode (3) sends enters described power vs. voltage transducer (4) after spectroscope (9) reflects.
4. based on the firm power laser output control method of the firm power laser output control system described in claim 1, it is characterised in that comprise the following steps:
Step one, laser diode driver circuit (2) control laser diode (3) and send laser and through spectroscope (9)；
Step 2, power vs. voltage transducer (4) receive the laser reflected through spectroscope (9), the reflection power received is converted to voltage Vr by described power vs. voltage transducer (4) and output is amplified to in-phase proportion amplifier (5), and Vr is real number；Processor (1) output voltage signal Vs is amplified and anti-phase to anti-phase proportional amplifier (6), and Vs is real number；
Step 3, described in-phase proportion amplifier (5) and anti-phase proportional amplifier (6) output voltage signal respectively gives summation integral amplifier (7), set the amplification of described in-phase proportion amplifier (5) as K, K > 0, the integrating resistor of described summation integral amplifier (7) be R, described summation integral amplifier (7) integrating capacitor be C, described summation integral amplifier (7) output voltage be V0, calculateObtain the output voltage of summation integral amplifier (7)；
Step 4, described summation integral amplifier (7) are by output voltage V0It is sent to described laser diode driver circuit (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310710757.5A CN103730831B (en) | 2013-12-20 | 2013-12-20 | Firm power laser output control system and method |
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| CN201310710757.5A CN103730831B (en) | 2013-12-20 | 2013-12-20 | Firm power laser output control system and method |
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| CN103730831A CN103730831A (en) | 2014-04-16 |
| CN103730831B true CN103730831B (en) | 2016-06-29 |
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| 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 |
| CN112260530B (en) * | 2020-12-22 | 2021-03-12 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5123024A (en) * | 1991-08-06 | 1992-06-16 | General Scanning, Inc. | Apparatus and method for controlling the light intensity of a laser diode |
| CN1188567A (en) * | 1995-06-23 | 1998-07-22 | 英国电讯有限公司 | Laser drive circuit |
| JP2000223770A (en) * | 1999-01-29 | 2000-08-11 | Toshiba Corp | Laser driving circuit |
| CN101533987A (en) * | 2008-03-11 | 2009-09-16 | 北京中视中科光电技术有限公司 | System used for assembling solid laser and method thereof |
| CN102013630A (en) * | 2010-10-09 | 2011-04-13 | 维林光电(苏州)有限公司 | Semiconductor laser module, method for stabilizing and denoising semiconductor laser, and solid laser |
| CN102290705B (en) * | 2011-06-23 | 2013-01-02 | 哈尔滨工业大学 | High-reliability constant voltage mode semiconductor laser driver with continuously adjustable output light power |
| CN102522696A (en) * | 2011-11-30 | 2012-06-27 | 江苏飞格光电有限公司 | Closed-loop digital liquid diode (LD) laser driving circuit |
| CN102496850B (en) * | 2011-12-27 | 2013-10-16 | 南京吉隆光纤通信股份有限公司 | Stable laser light source |
| CN103378545A (en) * | 2012-04-24 | 2013-10-30 | 北京中视中科光电技术有限公司 | Laser controller, laser control system and laser control method |
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