CN102079016A - Laser power control method and laser cutting device - Google Patents

Laser power control method and laser cutting device Download PDF

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Publication number
CN102079016A
CN102079016A CN2009101884367A CN200910188436A CN102079016A CN 102079016 A CN102079016 A CN 102079016A CN 2009101884367 A CN2009101884367 A CN 2009101884367A CN 200910188436 A CN200910188436 A CN 200910188436A CN 102079016 A CN102079016 A CN 102079016A
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China
Prior art keywords
output
power value
power
value
laser
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CN2009101884367A
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Chinese (zh)
Inventor
高云峰
张建群
彭金明
董林华
田社斌
朱云峰
刘昌军
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Shenzhen Hans Laser Technology Co Ltd
Han s Laser Technology Co Ltd
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Shenzhen Hans Laser Technology Co Ltd
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Priority to CN2009101884367A priority Critical patent/CN102079016A/en
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Abstract

The invention is suitable for laser cutting field and provides a laser power control method and a laser cutting device. The laser power control method comprises the following steps: collecting an injected power value and a coefficient value Kn (initial value K0 is equal to 1) input to a laser device by a machine tool; calculating an nth output power value; calculating an nth coefficient value according to the nth actual power value and the nth output power value calculated by a power sensor at real time; and calculating the (n+1)th output power value according to the nth coefficient value and the injected power value, wherein n is a natural number more than or equal to 1. According to the laser power control method provided by the invention, the coefficient value is calculated by collecting the actual power value of the laser device in real time, the actual power value is continuously corrected according to the coefficient value till the actual power value is equal to the injected power value output by the machine tool, and the stable laser power is sent to the machine tool for cutting.

Description

A kind of laser power control method and laser cutting device
Technical field
The invention belongs to laser and cut off the field, relate in particular to a kind of laser power control method and laser cutting device.
Background technology
In existing laser cutting was used, laser instrument need provide stable high power laser to cut and respond fast the lathe power signal to lathe.But can cause (comprising degradation under air pressure shakiness, the power) shakiness of laser power because of a variety of causes; Be that existing laser instrument can not provide stable laser power to cut to lathe, thereby cause the bad control of cutting accuracy.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of laser power control method, is intended to solve the problem that existing laser instrument can not provide stable laser power to cut to lathe.
The embodiment of the invention is achieved in that a kind of laser power control method, comprises the steps:
Step a, collection lathe are exported to the injecting power value of laser instrument, calculate the n output power value;
The n actual power value and the described n output power value of step b, the laser instrument gathered in real time according to power sensor calculate the n coefficient value;
Step c, calculate the n+1 output power value according to described n coefficient value and described injecting power value;
Steps d, judge whether the n+1 actual power value of the laser instrument that power sensor is gathered in real time equates with described injecting power value; If then finish; If not, then repeated execution of steps b, step c and steps d;
Described n is the natural number more than or equal to 1.
Further, described n output power value is determined according to following formula: P nOut=Pset*K nDescribed P nOut is the n output power value, and described Pset is the injecting power value that lathe is exported to laser instrument, described K nBe coefficient value, described coefficient value K nInitial value K 0=1.
Further, described coefficient value K nDetermine according to following formula: K n=P nOut/P nSam; Described P nOut is the n output power value, described P nSam is the power sensor n actual power value of the laser instrument of collection in real time.
Further, further comprised step e before described step b: whether the actual power signal of judging injecting power signal and laser instrument is stable, if, execution in step b then; If not, then continue execution in step e.
Another purpose of the embodiment of the invention is to provide a kind of laser cutting device, the laser instrument that it comprises lathe and is used for providing laser to described lathe; Described laser cutting device also comprises: the Feedback of Power circuit, its input is connected to the injecting power output of described lathe, the output of described Feedback of Power circuit is connected to the input of described laser instrument, and the sampling end of described Feedback of Power circuit is connected to the output of described laser instrument; Described Feedback of Power circuit calculates output power value according to the injecting power value of lathe output, and, according to described coefficient value described actual power value is revised until described actual power value again and equaled described injecting power value according to the actual power value and the described output power value design factor value of the laser instrument of real-time collection.
Further, described Feedback of Power circuit comprises:
Microprocessor;
First analog-to-digital conversion module, its input is connected to the injecting power output of described lathe, the output of described first analog-to-digital conversion module is connected to the input of described microprocessor, exports to described microprocessor after the injecting power value of described lathe output is converted to data signal;
Power sensor, its input is connected to the output of described laser instrument, and the actual power value of described laser instrument is gathered in real time;
Second analog-to-digital conversion module, its input is connected to the output of described power sensor, the output of described second analog-to-digital conversion module is connected to the feedback end of described microprocessor, and feedback was exported to described microprocessor after the actual power value of collection was converted to data signal in real time with described power sensor;
D/A converter module, its input is connected to the output of described microprocessor, and the output of described D/A converter module is connected to the output of described laser instrument; The actual power value that data signal after the described microprocessor processes is converted to output after the analog signal and controls described laser instrument equals described injecting power value.
Further, described microprocessor is that model is the chip of LPC2103.
Laser power control method provided by the invention is by gathering the actual power value of laser instrument in real time, according to actual power value that collects and output power value design factor value, and the actual power value is constantly revised the injecting power value that equals lathe output until the actual power value according to coefficient value; Can provide stable laser power to cut, can the power signal of lathe be responded rapidly, very strong adaptive ability be arranged, the control accuracy height to lathe.
Description of drawings
Fig. 1 is the realization flow figure of the laser power control method that provides of the embodiment of the invention;
Fig. 2 is the modular structure schematic diagram of the laser cutting device that provides of the embodiment of the invention;
Fig. 3 is the circuit diagram of the laser cutting device that provides of the embodiment of the invention.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The invention provides a kind of laser power control method, because laser instrument has the power signal of a plurality of power factors of instability and power sensor very big sluggishness to be arranged (because sensor is to be made of thermal diode, the reaction time of power signal is approximately more than the 500MS), so adopt the Feedback of Power control method, the present invention is by gathering the actual power value of laser instrument in real time, and by earlier to one of laser instrument input fixed preset performance number, the size that presets performance number is determined by coefficient value K, (COEFFICIENT K is the proportionate relationship that presets performance number and laser instrument actual power value of input), calculate the pairing real power of performance number of this input then according to power sensor, calculate coefficient value K again, and remodify the performance number of input, that is: the actual power value is constantly revised the injecting power value that equals lathe output until the actual power value according to coefficient value K.
This Poewr control method of the present invention can respond rapidly the power signal of lathe, very strong adaptive ability is arranged, the control accuracy height.
Fig. 1 shows the realization flow of the laser power control method that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Laser power control method comprises the steps:
In step S11, gather injecting power value Pset and coefficient value K that lathe is exported to laser instrument n(K nInitial value K 0=1, that is: directly export injecting power value Pset), calculate n output power value Pout, wherein, P nThe computing formula of out is P nOut=P nSet*K n
In step S13, according to the actual power value Psam and the described n output power value P of the real-time laser instrument of gathering of power sensor nOut, and design factor value K n, because power sensor is to be made of thermal diode, its reaction time is longer, about 500MS of reaction time is so must wait for actual power value Psam signal stabilization;
In step S14, according to coefficient value K nAnd injecting power value Pset recomputates n+1 output power value P N+1Out;
In step S15, after wait actual power value Psam is stable, judge the n actual power value P of the laser instrument that power sensor is gathered in real time nWhether sam equates with injecting power value Pset; If then finish; If not, then repeated execution of steps S13, step S14 and and this step S15, wherein, be the n actual power value P that judges the laser instrument that power sensor is gathered in real time by software nWhether sam equates with injecting power value Pset.
In embodiments of the present invention, also comprised step S12 before step S13: whether the actual power signal of judging injecting power signal and laser instrument is stable, if then continue to carry out next step S13; If not, then continue to carry out this step S12.
In embodiments of the present invention, output power value P nOut can determine according to following formula: P nOut=Pset*K nP wherein nOut is an output power value, and Pset is the injecting power value that lathe is exported to laser instrument, K nBe coefficient value.
As one embodiment of the present of invention, coefficient value K nCan determine according to following formula: K n=P nOut/P nSam; P wherein nOut is an output power value, P nSam is the power sensor actual power value of the laser instrument of collection in real time.
In order to illustrate further the laser power control method that the embodiment of the invention provides, now illustrate as follows: gather the injecting power value Pset of lathe, calculate output power value P then nOut, output power value P nOut can be according to formula P nOut=Pset*K nDetermine; Coefficient value K during beginning 0=1, that is: directly export injecting power signal Pset, power sensor is gathered the actual power value P of laser instrument then nSam, because power sensor is to be made of thermal diode, its reaction time is longer, therefore about 500MS of reaction time must wait for actual power value P nSam is stable; Wait for the actual power value P of the laser instrument of gathering in real time nAfter sam is stable, judge actual power value P nWhether sam and injecting power value Pset be stable, as actual power value P nSam and injecting power value Pset stablize the back by formula K n=P nOut/P nSam design factor K nCalculated COEFFICIENT K nAfter, need recomputate output power value P N+1Out, wait for the some time then after again with judging actual power value P N+1Whether sam and injecting power value Pset be stable, recomputates COEFFICIENT K then N+1, recomputate output power value P again N+1Out.So circulate, constantly design factor K nWith output power value P nOut makes injecting power value Pset infinitely near actual power value P nSam, thus the power waveform of laser instrument keeps similar to the wave mode of the injecting power value Pset of lathe, also reaches the purpose of laser power fast and stable.
In embodiments of the present invention, the stable control of laser power is by FEEDBACK CONTROL, and this feedback is by continuous design factor K, thereby makes actual power value Psam infinitely approach injecting power value Pset; This COEFFICIENT K nBe output power value P nOut and actual power value P nThe proportionate relationship of sam is according to this COEFFICIENT K nCan find the equalization point of lathe injecting power and laser instrument actual power fast, make the desired injecting power value of laser instrument output lathe; Design factor K in addition nPurpose be can real-time response the power signal of lathe, output is preset quantity of power and is given laser instrument fast, needn't consider the unsettled non-electric factor of power, can also avoid the influence of the time lag of power sensor simultaneously, accomplish to respond at a high speed and take into account the combination of low speed.
Fig. 2 shows the modular structure of the laser cutting device that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Laser cutting device comprises lathe 1, laser instrument 2 and Feedback of Power circuit 3; Wherein laser instrument 2 is used for providing laser to lathe 1, the input of Feedback of Power circuit 3 is connected to the injecting power output of lathe 1, the output of Feedback of Power circuit 3 is connected to the input of laser instrument 2, and the sampling end of Feedback of Power circuit 3 is connected to the output of laser instrument 2; Feedback of Power circuit 3 calculates output power value P according to the injecting power value Pset of lathe output nOut, and according to the actual power value P of the laser instrument 2 of real-time collection nSam and output power value P nOut design factor value K n, again according to coefficient value K nTo actual power value P nSam revises until actual power value P nSam equals injecting power value Pset.
In embodiments of the present invention, Feedback of Power circuit 3 comprises: microprocessor 31, first analog-to-digital conversion module 32, power sensor 33, second analog-to-digital conversion module 34 and D/A converter module 35; Wherein the input of first analog-to-digital conversion module 32 is connected to the injecting power output of lathe 1, the output of first analog-to-digital conversion module 32 is connected to the input of microprocessor 31, exports to microprocessor 31 after the injecting power value Pset that first analog-to-digital conversion module 32 is exported lathe 1 is converted to data signal; The input of power sensor 33 is connected to the output of laser instrument 2, and the actual power value Psam of 33 pairs of laser instruments 2 of power sensor gathers in real time; The input of second analog-to-digital conversion module 34 is connected to the output of power sensor 33, the output of second analog-to-digital conversion module 34 is connected to the feedback end of microprocessor 31, and feedback was exported to microprocessor 31 after the actual power value Psam that second analog-to-digital conversion module 34 is gathered power sensor 33 in real time was converted to data signal; The input of D/A converter module 35 is connected to the output of microprocessor 31, and the output of D/A converter module 35 is connected to the output of laser instrument 2; The actual power value Psam that data signal after microprocessor 31 handled is converted to output after the analog signal and control laser instrument 2 equals injecting power value Pset.
In embodiments of the present invention, the physical circuit of laser cutting device for convenience of explanation, only shows the part relevant with the embodiment of the invention as shown in Figure 3, and details are as follows.
Microprocessor 31 can adopt 32-bit microprocessor ARM7 chip U7, and first analog-to-digital conversion module 32 and second analog-to-digital conversion module 34 all can adopt modulus conversion chip ADC122S101; D/A converter module 35 can adopt analog-digital chip DAC7512; The normal phase input end of its chips U1 receives the injecting power value Pset of lathe output, and the output of chip U1 is connected to the AIN end of chip U2, and the inverting input of chip U1 is connected to the output of chip U1; The CS end of chip U2 is connected to the P0.7 input interface of chip U7, and the SCLK end of chip U2 is connected to the P0.8 input interface of chip U7, and the DOUT end of chip U2 is connected to the P0.9 input interface of chip U7; The actual power value Psam of the laser instrument that the normal phase input end received power sensor of chip U3 is gathered in real time, the output of chip U3 are connected to the AIN end of chip U4, and the inverting input of chip U3 is connected to the output of chip U3; The CS end of chip U4 is connected to the P0.11 input interface of chip U7, and the SCLK end of chip U4 is connected to the P0.12 input interface of chip U7, and the DOUT end of chip U4 is connected to the P0.13 input interface of chip U7; The CS end of chip U6 is connected to the P0.6 output interface of chip U7, and the SCLK end of chip U6 is connected to the P0.4 output interface of chip U7, and the DIN end of chip U6 is connected to the P0.5 output interface of chip U7; The VOUT end of chip U6 is connected to the normal phase input end of chip U5, and the inverting input of U5 is connected to the output of chip U5, the output output power value Pout of chip U5.
As the present invention embodiment, it is the chip of LPC2103 that microprocessor can adopt model; The LPC2103 chip has characteristics such as RAM is big, instruction throughput is high, interrupt response is real-time, most suitablely is used for doing this algorithm.In addition, finish the collection of machine power and laser power by modulus conversion chip ADC122S101, the signal of the collection of machine power and laser power all is 0 to 10 volt a signal, gathers the performance number that becomes to respond through the software treatment conversion again behind the voltage signal.Finish the output of power voltage by analog-digital chip DAC7512, the voltage of output is 0 to 10 volt signal, revises the injection electric current that output voltage just can be revised power supply, thus the power output of modification laser instrument.
The laser cutting device that the embodiment of the invention provides can stable laser laser power, can respond the lathe power signal fast again, make laser instrument provide stable laser power to cut to lathe; Circuit is simple simultaneously, and cost is low.
The laser power control method that the embodiment of the invention provides is by gathering the actual power value of laser instrument in real time, according to actual power value that collects and output power value design factor value, and the actual power value is constantly revised the injecting power value that equals lathe output until the actual power value according to coefficient value; Can provide stable laser power to cut, can the power signal of lathe be responded rapidly, very strong adaptive ability be arranged, the control accuracy height to lathe.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. a laser power control method is characterized in that, comprises the steps:
Step a gathers the injecting power value that lathe is exported to laser instrument, calculates the n output power value;
Step b, n actual power value and described n output power value according to the real-time laser instrument of gathering of power sensor calculate the n coefficient value;
Step c calculates the n+1 output power value according to described n coefficient value and described injecting power value;
Steps d judges whether the n+1 actual power value of the laser instrument that power sensor is gathered in real time equates with described injecting power value; If then finish; If not, then repeated execution of steps b, step c and this steps d;
Described n is the natural number more than or equal to 1.
2. laser power control method as claimed in claim 1 is characterized in that, described n output power value is determined according to following formula: P nOut=Pset*K n
Described P nOut is the n output power value, and described Pset is the injecting power value that lathe is exported to laser instrument, described K nBe coefficient value, described coefficient value K nInitial value K 0=1.
3. laser power control method as claimed in claim 2 is characterized in that, described coefficient value K nDetermine according to following formula: K n=P nOut/P nSam;
Described P nOut is the n output power value, described P nSam is the power sensor n actual power value of the laser instrument of collection in real time.
4. laser power control method as claimed in claim 1 is characterized in that, further comprises step e before described step b:
Whether the actual power signal of judging injecting power signal and laser instrument is stable, if, execution in step b then; If not, then continue execution in step e.
5. laser cutting device, the laser instrument that it comprises lathe and is used for providing laser to described lathe; It is characterized in that described laser cutting device also comprises:
Feedback of Power circuit, its input are connected to the injecting power output of described lathe, and the output of described Feedback of Power circuit is connected to the input of described laser instrument, and the sampling end of described Feedback of Power circuit is connected to the output of described laser instrument;
Described Feedback of Power circuit calculates output power value according to the injecting power value of lathe output, and, according to described coefficient value described actual power value is revised until described actual power value again and equaled described injecting power value according to the actual power value and the described output power value design factor value of the laser instrument of real-time collection.
6. laser cutting device as claimed in claim 5 is characterized in that, described Feedback of Power circuit comprises:
Microprocessor;
First analog-to-digital conversion module, its input is connected to the injecting power output of described lathe, the output of described first analog-to-digital conversion module is connected to the input of described microprocessor, exports to described microprocessor after the injecting power value of described lathe output is converted to data signal;
Power sensor, its input is connected to the output of described laser instrument, and the actual power value of described laser instrument is gathered in real time;
Second analog-to-digital conversion module, its input is connected to the output of described power sensor, the output of described second analog-to-digital conversion module is connected to the feedback end of described microprocessor, and feedback was exported to described microprocessor after the actual power value of collection was converted to data signal in real time with described power sensor;
D/A converter module, its input is connected to the output of described microprocessor, and the output of described D/A converter module is connected to the output of described laser instrument; The actual power value that data signal after the described microprocessor processes is converted to output after the analog signal and controls described laser instrument equals described injecting power value.
7. laser cutting device as claimed in claim 6 is characterized in that, described microprocessor is that model is the chip of LPC2103.
CN2009101884367A 2009-11-27 2009-11-27 Laser power control method and laser cutting device Pending CN102079016A (en)

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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
CN103056529A (en) * 2012-12-26 2013-04-24 苏州市博海激光科技有限公司 Online adjusting device of tipping paper air permeability
CN103157910A (en) * 2013-02-04 2013-06-19 深圳市大族激光科技股份有限公司 Method and system of displaying laser device power
CN111774722A (en) * 2020-06-30 2020-10-16 大族激光科技产业集团股份有限公司 Intelligent control method based on decay of feedback signal of capacitive sensor of laser system
CN114254247A (en) * 2021-12-20 2022-03-29 长沙大科激光科技有限公司 Waveform editing control system with laser power correction function
CN114336260A (en) * 2022-03-17 2022-04-12 北京芯源创通电子技术有限公司 Solid-state laser system and control method of solid-state laser

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CN1300123A (en) * 1999-12-16 2001-06-20 朗迅科技公司 Method and apparatus for stabilizing wave lenth of laser
US20070116076A1 (en) * 2005-11-21 2007-05-24 Frank Wang Controlling optical power and extincation ratio of a semiconductor laser
CN101030693A (en) * 2007-04-03 2007-09-05 烽火通信科技股份有限公司 Automatic illuminating-power controlling circuit for laser driver

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CN1300123A (en) * 1999-12-16 2001-06-20 朗迅科技公司 Method and apparatus for stabilizing wave lenth of laser
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Cited By (9)

* Cited by examiner, † Cited by third party
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
CN102554478B (en) * 2011-12-25 2014-10-08 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
CN103056529A (en) * 2012-12-26 2013-04-24 苏州市博海激光科技有限公司 Online adjusting device of tipping paper air permeability
CN103157910A (en) * 2013-02-04 2013-06-19 深圳市大族激光科技股份有限公司 Method and system of displaying laser device power
CN103157910B (en) * 2013-02-04 2016-06-29 大族激光科技产业集团股份有限公司 The method and system of display laser power
CN111774722A (en) * 2020-06-30 2020-10-16 大族激光科技产业集团股份有限公司 Intelligent control method based on decay of feedback signal of capacitive sensor of laser system
CN111774722B (en) * 2020-06-30 2022-07-01 大族激光科技产业集团股份有限公司 Intelligent control method based on decay of feedback signal of capacitive sensor of laser system
CN114254247A (en) * 2021-12-20 2022-03-29 长沙大科激光科技有限公司 Waveform editing control system with laser power correction function
CN114336260A (en) * 2022-03-17 2022-04-12 北京芯源创通电子技术有限公司 Solid-state laser system and control method of solid-state laser

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Application publication date: 20110601