CN1866651A - Intelligent high-power semiconductor laser drive apparatus - Google Patents
Intelligent high-power semiconductor laser drive apparatus Download PDFInfo
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- CN1866651A CN1866651A CN 200610013955 CN200610013955A CN1866651A CN 1866651 A CN1866651 A CN 1866651A CN 200610013955 CN200610013955 CN 200610013955 CN 200610013955 A CN200610013955 A CN 200610013955A CN 1866651 A CN1866651 A CN 1866651A
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Abstract
The invention discloses an intelligent large-power semiconductor laser driving device, which comprises the following parts: micro-controller, input and output equipment interface, display equipment, display equipment interface, PC set communication interface, driving circuit, AD interface and DA interface. The device adopts combination circuit of digital control circuit and analog closed-loop control circuit to control driving current of semiconductor laser precisely, which adjusts time-delayed soft starting curve according to need through intelligent digital control method.
Description
Technical field
The invention belongs to semiconductor laser Driving technique field, particularly the precise control device of high power semiconductor lasers drive current.
Background technology
Semiconductor laser is that the light that utilizes the interior stimulated radiation resonant cavity that produces of semi-conducting material to provide feeds back a based semiconductor device of making, and it needs current drives.Semiconductor laser is a kind of junction device, and is poor to the ability to bear of surge, big electricity transient process have nanosecond or more the current peak of broad pulse width form, can cause its permanent damage.The fluctuation of small drive current can cause the very big variation of luminous power and the broadening of output wavelength spectrum.Therefore, the power supply of semiconductor laser must have special protective circuit, as time-delay soft start protection and current-limiting protection etc., also should have high current stability, simultaneously.
In the prior art, Chinese patent publication number CN200420076203.0, open day on December 7th, 2005, name is called " the accurate current control device of high power semiconductor lasers ", the accurate current control device of a kind of high power semiconductor lasers is disclosed, its drive circuit is an analog closed-loop control circuit, accurately Control current.But only depend on analogue technique to realize, the size of electric current output realizes by regulating adjustable resistance; The time-delay soft start protection only realizes by electric capacity.Mainly there is following shortcoming in above-mentioned semiconductor laser Driving technique: can't with the ppu swap data, the well work of monitoring laser needs the knob of manual adjustments potentiometer, inconvenient operation when setting electric current and regulating electric current; When regulating output current,, can cause the damage of laser as potentiometer generation problem; Time-delay soft start only realizes that by electric capacity duration curve is non-adjustable, and effect is undesirable; After being damaged, current limiting element or control fluid element can directly cause the damage of laser.
Chinese patent publication number CN200510011124.0, open day on August 10th, 2005, name is called " driving power of semiconductor laser drive current control method and multi-mode working ", the driving power of disclosed semiconductor laser has been used digital control circuit, control and operation have been made things convenient for, but its control section is actual is a digital closed loop circuit, and microcontroller is gathered the semiconductor laser working state signal, through a large amount of back output current control signals of calculating.Its shortcoming is: the digital closed loop circuit response time is long, is difficult to accomplish the variation of real-time response semiconductor laser, is unfavorable for controlling accurately the electric current of semiconductor laser.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention proposes a kind of digital intelligent high-power semiconductor laser drive apparatus.The circuit that adopts digital control circuit and analog closed-loop control circuit to combine makes when the drive current of noise spectra of semiconductor lasers is accurately controlled, can carry out various setting operations easily, and is desirable reliable to the adjusting of laser; Adopted the special protection circuit prevent current limiting element or the control fluid element be damaged the back noise spectra of semiconductor lasers damage; Utilize the intelligent digital control method to make the time-delay soft start curve to adjust with the need.
Solution of the present invention is:
A kind of semiconductor laser drive, it comprises microcontroller, input equipment and input equipment interface, display device and display device interfaces, the PC communication interface, drive circuit, its characteristics are: described drive unit also comprises AD interface and DA interface; Wherein:
Microcontroller links to each other with input equipment and input equipment interface, display device and display device interfaces, PC communication interface, AD interface and DA interface respectively, and drive circuit links to each other with semiconductor laser, AD interface and DA interface respectively;
Input equipment and input equipment interface are used for receiving the input data and exporting microcontroller to;
Display device and display device interfaces are used to receive the data of microcontroller and show;
The PC communication interface is used for microcontroller and PC communication, can make PC directly control the operating state of laser;
The AD interface is used to receive the analog signal of drive circuit, and exports the digital signal that generates to microcontroller;
The DA interface is used to receive the digital controlled signal of microcontroller, and exports the analog signal that generates to drive circuit;
Drive circuit constitutes the analog closed-loop control system separately, is used for the output semiconductor laser drive current, makes semiconductor laser output stabilized lasers;
Microcontroller is used for whole control, constitutes the digital open loop control system with AD interface, DA interface and drive circuit.
Wherein, described drive circuit specifically comprises:
The maximum current monitoring module links to each other with current limliting output, is used to monitor maximum current.
The current limliting output module, input links to each other with the DA interface with start-up circuit respectively, and output links to each other with semiconductor laser with the output current adjustment module respectively, the output of restriction maximum current.
The output current adjustment module links to each other with feedback circuit with current limliting output module, delay circuit, output current control module respectively, is used for the electric current that branch is walked the output of current limliting output module, thereby regulates the electric current that outputs on the laser, reaches the purpose of current stabilization.
Current sampling module, input links to each other with semiconductor laser, and monitoring links to each other with output current with feedback circuit respectively in output, and the current signal that is used for flowing through on the laser is converted to voltage signal.
The output current monitoring, input links to each other with current sampling module, and output links to each other with the AD interface, is used to monitor the electric current that flows through on the semiconductor laser.
Feedback circuit, input links to each other with current sampling module, and output is regulated with output current and is linked to each other, and is used to produce feedback signal, makes outputting current steadily.
The output current control module, input links to each other with the DA interface, and output is regulated with output current and is linked to each other, and is used to accept the control signal of microcontroller, carries out processing such as signal amplification.
Delay circuit, input links to each other with start-up circuit, output is regulated with output current and is linked to each other, be used for the drive unit unlatching after, the electric current that current control module is exported to the output current adjustment module slowly increases to predetermined value.
Start-up circuit links to each other with the current limliting output circuit with delay circuit respectively, is used to start delay circuit and current limliting output circuit.
Protective circuit links to each other with current sampling module with current limliting output module, output current adjustment module respectively, is used to protect laser, makes it can and not regulate the current element inefficacy and damage owing to current limiting element.
Described microcontroller can be by software programming, controls described DA interface to the output of slowly delaying time of maximum current and output current, and makes both synchronous; Can adjust the delayed startup curve as required.
Microcontroller of the present invention is a single-chip microcomputer, single board computer, DSP, field programmable gate array (FPGA), CPLD (CPLD).
Input equipment of the present invention is keyboard or touch-screen.
Display device of the present invention can be charactron or liquid crystal display screen.
AD interface of the present invention and DA interface can be integrated in microcontroller inside.
Relative prior art, the present invention combines digital control circuit and analog closed-loop control circuit, the damage of noise spectra of semiconductor lasers after employing special protection circuit prevents from current limiting element or control fluid element to be damaged, realize maximum output current and output current adjusting with digital circuit easily, realize the adjusting of semiconductor laser electric current indirectly; Can realize time-delay soft start by software programming.Following advantage is specifically arranged:
1, the circuit that combines of digital control circuit and analog closed-loop control circuit makes and accurately in the control, can carry out various setting operations at the drive current of noise spectra of semiconductor lasers easily.
2, numerically controlled method replaces traditional external knob to regulate the method for electric current, makes that the Current Regulation of laser is accurately reliable.
3, carry out Digital Control by program, maximum current and output current are delayed time, make its slow rising, and cooperate, realize the soft start of semiconductor laser with the hardware delay circuit.And time-delay soft start is reliable, can obtain desirable duration curve, protects semiconductor laser better.
4, the damage of noise spectra of semiconductor lasers after employing special protection circuit can be avoided the current limliting components and parts and regulate the current element device failure.
Description of drawings
Fig. 1 is a general structure schematic diagram of the present invention.
Fig. 2 is the structural representation of drive circuit of the present invention.
Fig. 3 is the circuit diagram of current-limiting circuit of the present invention and output current regulating circuit.
The flow chart that Fig. 4 controls for microcontroller
Embodiment
In conjunction with the accompanying drawings, digital intelligent high-power semiconductor laser drive apparatus of the present invention is described in detail as follows:
Digital intelligent high-power semiconductor laser drive apparatus general structure of the present invention comprises as shown in Figure 1: display device and display device interfaces 1, input equipment and input equipment interface 2, microcontroller 3, PC communication interface 4, AD interface 5, DA interface 6 and drive circuit 7.Microcontroller 3 is used for whole control, can receive the signal of input equipment and input equipment interface 2 and AD interface 5, output signal to display device and display device interfaces 1 and DA interface 6 after making respective handling, and can communicate by letter with PC by PC communication interface 4, can transmit data with PC and accept the control of PC.The DA signal controlling that drive circuit 7 is produced by DA interface 6, and working state signal transferred to the AD interface.
Be the structural representation of drive circuit 7 of the present invention in Fig. 2 frame of broken lines, it comprises: maximum current monitoring 8, and current limliting output 9, output current regulates 10; protective circuit 11, current sampling 12, output current monitoring 13; feedback circuit 14, output current control 15, delay circuit 16 and start-up circuit 17.The drive circuit works principle is: after circuit powered on, current limliting output 9 was not worked, and did not have electric current to flow out.After the outside applies enabling signal, start-up circuit 17 control current limliting outputs 9 and delay circuit 16 are started working, and the current limliting output 9 DA1 signal controlling by DA interface 6 are exported given maximum current, and output signal to maximum current monitoring 8, monitor by AD interface 5.Simultaneously, enabling signal starts delay circuit 16, and output current is regulated 10 slow output currents.The output current control 15 DA2 signal controlling by DA interface 6 make output current regulate the given electric current of 10 outputs.Current sampling 12 converts the current signal that flows through on the semiconductor laser to voltage signal, exports feedback circuit 14 to, and feedback signal exports output current to and regulates 10, forms the analog closed-loop feedback, thereby realizes the adjusting of electric current on the noise spectra of semiconductor lasers.Current sampling 12 outputs signal to output current monitoring 13, monitors by AD interface 5.Protective circuit 11 detects the electric current on the current sampling module, when the electric current overrate, at once with current limliting output module 9 and output current adjustment module 10 associating limit laser devices on electric current.
Fig. 3 is the circuit diagram of current limliting output circuit of the present invention and output current regulating circuit.R1 is a current-limiting resistance, and MOSFET1 is the element of control maximum current, and its size of current of flowing through to current limliting output circuit 9, makes maximum current constant sampling voltage signal feedback on the current-limiting resistance by the decision of the output voltage of control circuit 1.The electric current that flows through on the MOSFET2 is regulated the 10 voltage decisions that provide by output current.R2 is the output current sample resistance, converts the current signal of the semiconductor laser of flowing through to voltage signal, and feeds back to output current by feedback circuit 14 and regulate 10, regulates the electric current that flows through on the MOSFET2.The electric current part of the current limliting output output current regulating circuit 10 of flowing through, another part semiconductor laser of flowing through.Can regulate the electric current of the semiconductor laser of flowing through indirectly by regulating the electric current of flowing through on the MOSFET2.The damage of noise spectra of semiconductor lasers when the structure of this employing special protection circuit can effectively prevent to control the element MOSFET1 of maximum current and regulate output current element MOSFET2 to damage.The mode that current limiting element and adjusting current element damage comprises puncture and disconnects two kinds.If MOSFET1 is breakdown, then current-limiting resistance R1 right-hand member voltage becomes big, and protective circuit 11 obtains opening adjusting output current element MOSFET2 rapidly fully after the feedback, and super-high-current can flow through from MOSFET2, and semiconductor laser can not damage; If MOSFET2 is breakdown, then semiconductor laser is not had electric current and flows through by short circuit, can not cause damage; If MOSFET1 is disconnected, then can not produce electric current in the circuit, no current on the semiconductor laser can not damage; If MOSFET2 is disconnected; when the electric current on the semiconductor laser surpassed rated current, sampled voltage fed back to protective circuit 11 rapidly, and protective circuit 11 is turn-offed the element MOSFET1 of maximum current at once; the semiconductor laser no current is flow through, and then semiconductor laser can not damage.
Fig. 4 implements the flow chart of control for microcontroller.The flow process that microcontroller is implemented control to analog drive circuit may further comprise the steps:
1, power supply electrifying, microcontroller is started working.
2, each several part is carried out initialization, comprise display device and display device interfaces, input equipment and input equipment interface, PC communication interface, AD interface and DA interface.
3, by input equipment and input equipment interface, microcontroller is accepted the maximum operating currenbt value of external setting-up and the working current value of laser.If the lowest high-current value of setting surpasses the current value that laser can bear, then report to the police.Assignment procedure shows on display device in real time.
4, wait for whether software certification is exported.Confirm then to continue, otherwise cycle detection.
5, DA1, DA2 output zero level voltage prevents to cause voltage jump when formal output and damages laser.
6, detect external start signal, when enabling signal takes place, continue, otherwise circulation.After enabling signal took place, output circuit, delay circuit and output circuit regulating circuit were started working in limited time.
7, DA1 signal and DA2 signal are exported under the control of microcontroller, and analog signal is increased to the setting electric current from small to large gradually, thereby guarantee that the electric current that flows through on the laser slowly raises from small to large.DA1 signal and DA2 signal keep constant voltage difference, the current constant that the feasible output current of flowing through is regulated, thus guarantee that the laser both end voltage slowly raises from small to large.This voltage difference can be according to the decision of the cut-in voltage of MOSFET2, makes the dissipation power minimum of MOSFET2 like this.
8, start the AD signal, monitor the operating state of drive circuit in real time, and on display device, show maximum current and output current in real time.If maximum current or output current occur unusual, DA1 is made zero, promptly cut off current limliting output.
9, whether cycle detection needs to reset.AD interface and DA interface operate as normal all in this process.As receive the signal that input equipment need reset, and then turn back to step 2 and begin to carry out, on the contrary then circulation.
Claims (7)
1, a kind of semiconductor laser drive, it comprises microcontroller, input equipment and input equipment interface, display device and display device interfaces, the PC communication interface, drive circuit is characterized in that: described drive unit also comprises AD interface and DA interface;
Wherein:
Microcontroller links to each other with input equipment and input equipment interface, display device and display device interfaces, PC communication interface, AD interface and DA interface respectively, and drive circuit links to each other with semiconductor laser, AD interface and DA interface respectively;
Input equipment and input equipment interface (2) are used for receiving the input data and exporting microcontroller (3) to;
Display device and display device interfaces (1) are used to receive the data of microcontroller (3) and show;
PC communication interface (4) is used for microcontroller (3) and PC communication, can make PC directly control the operating state of laser;
AD interface (5) is used to receive the analog signal of drive circuit (7), and exports the digital signal that generates to microcontroller (3);
DA interface (6) is used to receive the digital controlled signal of microcontroller (3), and exports the analog signal that generates to drive circuit (7);
Drive circuit (7) constitutes the analog closed-loop control system separately, is used for the output semiconductor laser drive current, makes semiconductor laser output stabilized lasers;
Microcontroller (3) is used for whole control, constitutes the digital open loop control system with AD interface (5), DA interface (6) and drive circuit (7).
2, digital intelligent high-power semiconductor laser drive apparatus as claimed in claim 1 is characterized in that, described drive circuit comprises:
The maximum current monitoring module links to each other with current limliting output, is used to monitor maximum current;
The current limliting output module, input links to each other with the DA interface with start-up circuit respectively, and output links to each other with semiconductor laser with the output current adjustment module respectively, the output of restriction maximum current;
The output current adjustment module links to each other with feedback circuit with current limliting output module, delay circuit, output current control module respectively, is used for the electric current that branch is walked the output of current limliting output module, thereby regulates the electric current that outputs on the laser, reaches the purpose of current stabilization;
Current sampling module, input links to each other with semiconductor laser, and monitoring links to each other with output current with feedback circuit respectively in output, and the current signal that is used for flowing through on the laser is converted to voltage signal;
The output current monitoring, input links to each other with current sampling module, and output links to each other with the AD interface, is used to monitor the electric current that flows through on the semiconductor laser;
Feedback circuit, input links to each other with current sampling module, and output is regulated with output current and is linked to each other, and is used to produce feedback signal, makes outputting current steadily;
The output current control module, input links to each other with the DA interface, and output is regulated with output current and is linked to each other, and is used to accept the control signal of microcontroller, carries out processing such as signal amplification;
Delay circuit, input links to each other with start-up circuit, output is regulated with output current and is linked to each other, be used for the drive unit unlatching after, the electric current that current control module is exported to the output current adjustment module slowly increases to predetermined value;
Start-up circuit links to each other with the current limliting output circuit with delay circuit respectively, is used to start delay circuit and current limliting output circuit; Protective circuit links to each other with current sampling module with current limliting output module, output current adjustment module respectively, is used to protect laser, makes it can and not regulate the current element inefficacy and damage owing to current limiting element.
3, digital intelligent high-power semiconductor laser drive apparatus as claimed in claim 1, it is characterized in that described microcontroller can be by software programming, control described DA interface to the output of slowly delaying time of maximum current and output current, and make both synchronous; Can adjust the delayed startup curve as required.
4, digital intelligent high-power semiconductor laser drive apparatus as claimed in claim 1 is characterized in that, described microcontroller is a single-chip microcomputer, single board computer, DSP, field programmable gate array (FPGA), CPLD (CPLD).
5, digital intelligent high-power semiconductor laser drive apparatus as claimed in claim 1 is characterized in that, input equipment of the present invention is keyboard or touch-screen.
6, digital intelligent high-power semiconductor laser drive apparatus as claimed in claim 1 is characterized in that, display device of the present invention is charactron or liquid crystal display screen.
7, digital intelligent high-power semiconductor laser drive apparatus as claimed in claim 1 is characterized in that, AD interface of the present invention and DA interface can be integrated in microcontroller inside.
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| CNB2006100139556A CN100487991C (en) | 2006-05-30 | 2006-05-30 | Intelligent high-power semiconductor laser drive apparatus |
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| CNB2006100139556A CN100487991C (en) | 2006-05-30 | 2006-05-30 | Intelligent high-power semiconductor laser drive apparatus |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461559C (en) * | 2007-04-02 | 2009-02-11 | 北京航空航天大学 | Driving circuit for high-speed and high-reliability modulated laser |
| CN101540476B (en) * | 2009-04-07 | 2011-03-16 | 吉林大学 | Constant current driver of digital semiconductor laser |
| CN102097739A (en) * | 2010-12-29 | 2011-06-15 | 深圳市大族激光科技股份有限公司 | Laser control system and method |
| CN103219647A (en) * | 2013-03-26 | 2013-07-24 | 武汉锐泽科技发展有限公司 | Semiconductor laser power supply |
| CN104242028A (en) * | 2014-09-19 | 2014-12-24 | 武汉锐科光纤激光器技术有限责任公司 | Feedback type high-peak-power picosecond-pulse fiber laser system |
| CN104795727A (en) * | 2014-01-16 | 2015-07-22 | 中能激光显示技术（上海）有限公司 | High-power semiconductor laser driving system and driving method thereof |
| CN105137870A (en) * | 2015-08-14 | 2015-12-09 | 江苏中科四象激光科技有限公司 | Digital signal processor (DSP)-based large-power laser control system |
| CN105562952A (en) * | 2016-02-29 | 2016-05-11 | 深圳市创鑫激光股份有限公司 | Monitoring system for laser device |
| CN106207746A (en) * | 2016-08-26 | 2016-12-07 | 江苏亚威机床股份有限公司 | A kind of cut pulse-width modulator |
| CN107370014A (en) * | 2017-08-23 | 2017-11-21 | 深圳市杰普特光电股份有限公司 | A kind of laser control circuit and laser |
| CN108150836A (en) * | 2016-12-02 | 2018-06-12 | 天津超音科技有限公司 | Monitoring leak from oil gas pipe early warning system based on optical fiber |
| CN109798937A (en) * | 2019-02-18 | 2019-05-24 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Low-power semiconductor laser reliability Auto-Test System |
| CN109888610A (en) * | 2019-02-18 | 2019-06-14 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Multistation reliability of semiconductor laser test macro |
| CN110401103A (en) * | 2019-07-26 | 2019-11-01 | 光梓信息科技（上海）有限公司 | Pulse laser driver |
| CN115685812A (en) * | 2022-09-30 | 2023-02-03 | 深圳清华大学研究院 | Multifunctional SIP packaging driving chip of high-power laser |
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- 2006-05-30 CN CNB2006100139556A patent/CN100487991C/en active Active
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461559C (en) * | 2007-04-02 | 2009-02-11 | 北京航空航天大学 | Driving circuit for high-speed and high-reliability modulated laser |
| CN101540476B (en) * | 2009-04-07 | 2011-03-16 | 吉林大学 | Constant current driver of digital semiconductor laser |
| CN102097739A (en) * | 2010-12-29 | 2011-06-15 | 深圳市大族激光科技股份有限公司 | Laser control system and method |
| CN102097739B (en) * | 2010-12-29 | 2012-02-01 | 深圳市大族激光科技股份有限公司 | Laser control system and method |
| CN103219647B (en) * | 2013-03-26 | 2016-01-06 | 武汉锐泽科技发展有限公司 | A kind of semiconductor laser power supply |
| CN103219647A (en) * | 2013-03-26 | 2013-07-24 | 武汉锐泽科技发展有限公司 | Semiconductor laser power supply |
| CN104795727A (en) * | 2014-01-16 | 2015-07-22 | 中能激光显示技术（上海）有限公司 | High-power semiconductor laser driving system and driving method thereof |
| CN104242028A (en) * | 2014-09-19 | 2014-12-24 | 武汉锐科光纤激光器技术有限责任公司 | Feedback type high-peak-power picosecond-pulse fiber laser system |
| CN105137870A (en) * | 2015-08-14 | 2015-12-09 | 江苏中科四象激光科技有限公司 | Digital signal processor (DSP)-based large-power laser control system |
| CN105562952A (en) * | 2016-02-29 | 2016-05-11 | 深圳市创鑫激光股份有限公司 | Monitoring system for laser device |
| CN106207746B (en) * | 2016-08-26 | 2022-01-07 | 江苏亚威机床股份有限公司 | Laser cutting pulse width modulator |
| CN106207746A (en) * | 2016-08-26 | 2016-12-07 | 江苏亚威机床股份有限公司 | A kind of cut pulse-width modulator |
| CN108150836A (en) * | 2016-12-02 | 2018-06-12 | 天津超音科技有限公司 | Monitoring leak from oil gas pipe early warning system based on optical fiber |
| CN107370014A (en) * | 2017-08-23 | 2017-11-21 | 深圳市杰普特光电股份有限公司 | A kind of laser control circuit and laser |
| CN109888610A (en) * | 2019-02-18 | 2019-06-14 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Multistation reliability of semiconductor laser test macro |
| CN109798937A (en) * | 2019-02-18 | 2019-05-24 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Low-power semiconductor laser reliability Auto-Test System |
| CN110401103A (en) * | 2019-07-26 | 2019-11-01 | 光梓信息科技（上海）有限公司 | Pulse laser driver |
| CN110401103B (en) * | 2019-07-26 | 2021-03-23 | 光梓信息科技（上海）有限公司 | Pulse laser driver |
| CN115685812A (en) * | 2022-09-30 | 2023-02-03 | 深圳清华大学研究院 | Multifunctional SIP packaging driving chip of high-power laser |
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