CN104795727A - High-power semiconductor laser driving system and driving method thereof - Google Patents
High-power semiconductor laser driving system and driving method thereof Download PDFInfo
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- CN104795727A CN104795727A CN201410020545.9A CN201410020545A CN104795727A CN 104795727 A CN104795727 A CN 104795727A CN 201410020545 A CN201410020545 A CN 201410020545A CN 104795727 A CN104795727 A CN 104795727A
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Abstract
The invention discloses a high-power semiconductor laser driving system. The driving system comprises a central processing module used for generating a digital control signal, a driving current setting module used for generating an analog control signal according to the digital control signal, a laser display driving module used for generating driving current according to the analog control signal, a high-power semiconductor laser used for performing laser display according to the driving current, a driving current detection module used for collecting the driving current, converting the driving current into a digital signal and transmitting the digital signal to the central processing module, and a power supply module connected with the central processing module, the driving current setting module, the laser display driving module and the driving current detection module and used for providing power needed for working. The high-power semiconductor laser driving system of the invention can accurately and quickly control the magnitude of the output driving current and ensure safe and stable operation of a laser. The invention further discloses a high-power semiconductor laser driving method.
Description
Technical field
The invention belongs to semiconductor laser field, particularly relate to a kind of drive system and driving method thereof of high power semiconductor lasers.
Background technology
Along with the progress of society, people improve constantly for the requirement of display, comprise higher resolution, larger colour gamut, color more true to nature etc.In recent years, laser display technology is fast-developing, after Display Technique relaying white and black displays, colored display, numerical monitor, adopts the Display Technique of LASER Light Source to become the next generation of greatest concern and shows high-end technology.
Laser display technology utilizes red, green, blue (RGB) tricolor laser device to be the Display Technique of light source, is an important problem in modern display technology.The maximum advantage of laser display is exactly that its color domain coverage ratio can reach 90%, shows very large expansion compared with tradition.Can whether the performance of Laser Power Devices directly determines laser and can normally work, and give play to the wide advantage of its colour gamut as far as possible.The gradual perfection of Laser Power Devices is always along with the development of laser.
Semiconductor laser relies on the direct injection of charge carrier and works, and is a kind of device with the sub-efficiency of higher amount, and thus the stable normal output for laser of drive current has key effect.The minor variations of drive current may cause the change of the device parameters such as great variety and excitation wavelength of Output optical power, and then affects display effect, jeopardizes the safe handling of laser what is more.If utilize common driving power to carry out drive laser, its various advantage may be played, even cause device failure.Therefore need to design and produce the work that some special Laser Power Devices drive circuits ensure laser normal table.
Drive circuit for laser has several different type of drive, mainly: constant current drived control, Constant-power drive control and pulsed drive controls.It is constant-current source drive laser that constant current drived control is driving power, is regulated the luminous power of laser by the size adjusting electric current; Constant-power drive controls to refer to that driving power provides electric current to make laser works in constant luminous power; Pulsed drive controls to refer to that driving power provides pulse current source for laser, and the size according to duty ratio carrys out regulating optical power.In laser projection, laser needs to export different luminous powers, therefore will select current constant control or pulse controlled mode.
Due in technical field of laser display, the laser especially selected in laser projection is all powerful, and the drive circuit in some common laser devices can not directly use.How designing suitable Laser Power Devices driving makes the advantage of laser better bring into play, how to improve automaticity and the stability of drive system, becomes problem in the urgent need to address.
The domestic research for semiconductor laser drive power also has a lot, but great majority are for optical fiber communication aspect, and the requirement for drive current is not very large, is generally tens to hundreds of milliampere.And the research driven for the high power laser of laser display technology aspect is also fewer, domestic laser display industrialization is also in the starting stage, the present invention has very important realistic meaning for the research of the high power laser driving power of laser display, is conducive to the development promoting laser display industry.
Summary of the invention
Instant invention overcomes in prior art the defect lacking high power laser drive system, propose a kind of drive system and driving method thereof of high power semiconductor lasers.
The present invention proposes a kind of drive system of high power semiconductor lasers, comprising: central processing module, it generates digital controlled signal; Drive current arranges module, and it is connected with described central processing module, for generating analog control signal according to described digital controlled signal; Laser display driver module, itself and described drive current arrange model calling, for generating drive current according to described analog control signal; High power semiconductor lasers, it is connected with described laser display driver module, for carrying out laser display according to drive current; Drive current detection module, it is connected with described central processing module and described high power semiconductor lasers respectively, is converted to digital signal for gathering described drive current and transfers in described central processing module; And supply module, it arranges module, described laser display driver module and described drive current detection module respectively and is connected and provides the power supply needed for work to supply with described central processing module, described drive current.
In the drive system of the high power semiconductor lasers that the present invention proposes, described central processing module is connected with described laser display driver module further, described central processing module carries out pulse width modulation according to the enable signal of described laser display driver module and electric current, stablizes the operating state of described laser display driver module.
In the drive system of the high power semiconductor lasers that the present invention proposes, described supply module comprises digital power system power supply and simulation power supply, and described digital power system power supply arranges module with described central processing module, described drive current respectively and described drive current detection module is connected; Described simulation power supply is connected with described laser display driver module.
The invention allows in a kind of driving method of drive system of high power semiconductor lasers, comprise the steps:
Initialization step, drive system described in initialization also presets drive current desired value;
Drive job step, described drive system generates digital controlled signal according to described drive current desired value, and generates the work of drive current driving high power semiconductor lasers according to described digital controlled signal;
Set-up procedure, digital controlled signal described in Detection and adjustment, and re-start described driving job step and regenerate drive current described high power semiconductor lasers is driven.
In the driving method of the drive system of the high power semiconductor lasers that the present invention proposes, described initialization step comprises the steps:
Step one: described central processing module carries out Initialize installation, presets drive current desired value in described central processing module;
Step 2: described central processing module drives the work of described laser display driver module;
Step 3: described central processing module reads the inner drive current desired value stored.
In the driving method of the drive system of the high power semiconductor lasers that the present invention proposes, described driving job step comprises the steps:
Step 4: described central processing module generates digital controlled signal according to described drive current desired value;
Step 5: described drive current arranges module and generates analog control signal according to described digital controlled signal;
Step 6: described laser display driver module generates drive current according to described analog control signal and inputs described high power semiconductor lasers;
Step 7: described high power semiconductor lasers carries out laser display according to described drive current.
In the driving method of the drive system of the high power semiconductor lasers that the present invention proposes, described set-up procedure comprises the steps:
Step 8: described drive current detection module gathers described drive current and obtains sampled signal;
Step 9: described sampled signal is converted to digital signal from analog signal by described drive current detection module, and transfers to described central processing module;
Step 10: described central processing module analyzes described sampled signal, and adjust described digital controlled signal according to described sampled signal and re-start described driving job step.
In the driving method of the drive system of the high power semiconductor lasers that the present invention proposes, the digital controlled signal of described central processing module adjustment is as shown in the formula expression:
In formula, i represents i-th moment under discrete-time system, n represented for the n-th moment, Vu represents that the digital controlled signal that described central processing module exports, Kp are proportionality coefficient, and Ki is integral coefficient, Kd is differential coefficient, Vi represents that the sampled signal that i-th moment drive current detection module returns, Vn represent the sampled signal that the n-th moment drive current detection module returns, and V represents the typical set value that system preliminary examination is arranged.
This digital controlled signal uses PID to control adjustment, because digital controlled signal is to analog control signal, to simulation High-current output, arrive actual output large driven current density electric current again, whole process signal conversion is more, and relate to large driven current density, higher to device parameter requirements, the actual drive current exported hardly may be identical with the value of initial setting.Therefore central processing module selects PID to control to adjust digital controlled signal rapidly, makes its drive current controlling actual output quick, is stabilized in accurately in the typical set value of system preliminary examination setting.
Beneficial effect of the present invention comprises: control laser display driver module by central processing module by digital controlled signal, by drive current detection module, the drive current of detection is fed back to central processing module again, form real-time closed-loop control system, precise and stable output driving current, the size of output driving current can be controlled quickly and accurately, ensure the safe and stable operation of laser.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the drive system of high power semiconductor lasers of the present invention.
Fig. 2 is the workflow diagram of the driving method of high power semiconductor lasers of the present invention.
Fig. 3 is the Signal transmissions figure in an embodiment.
Fig. 4 is the oscillogram of control signal in an embodiment and output current.
Fig. 5 is the hardware circuit diagram of the drive system of high power semiconductor lasers in an embodiment.
The circuit diagram of Fig. 6 to be a kind of with MAX4073T be drive current detection module of core.
Fig. 7 is the analogous diagram of driving method output driving current of the present invention.
Embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the following content mentioned specially, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
Fig. 1 display be the schematic diagram of the drive system of high power semiconductor lasers of the present invention, mainly comprise central processing module 11, drive current arranges module 12, drive current detection module 15, laser display driver module 13, supply module 16 and high power semiconductor lasers 14.
Wherein, central processing module 11 is single-chip microprocessor MCU or programmable logic device FPGA, is the core of whole system of the present invention, controls the work that whole system safety and precise is stable.Central processing module 11 and drive current arrange module 12 and are connected, and according to the digital controlled signal of central processing module 11, drive current arranges module 12 and exports analog control voltage fast and accurately.
Drive current arranges module 12 and is connected with laser display driver module 13, and laser display driver module 13 is final outputs of whole system, exports final accurate drive current.Arrange the analog control voltage signal of module 12 according to drive current, laser display driver module 13 exports corresponding drive current accurately, last termination laser module 14, Direct driver high power semiconductor lasers.Wherein, drive current arranges module 12 is high accuracy analog-digital chip DAC or a digital regulation resistance.
The core of laser display driver module 13 of the present invention uses great power LED integrated drive chips widely, be aim at the LED of large driven current density and the synchronous buck DC/DC controller designed, in a typical apply of the present invention, select the driving chip LT3743 of Linear Tech.
Be illustrated in figure 3 of the present invention a kind of with the typical apply Signal transmissions figure of the LT3743 driving chip laser display driver module 13 that is core, its hardware circuit diagram as shown in Figure 5, the laser display driver module 13 being core with LT3743 driving chip, electric current up to 40A can be provided, there is provided the power more than 80W, its efficiency is up to 95%.PWM (Pulse WidthModulation, pulse width modulation) light-modulating mode can provide 3000: 1 light modulation ratio, input voltage range is 6V to 36V, adopt average current control mode, have employed a unique switch output capacitor topological structure and two independently compensating network, can to change between two stabilizing LED current values less than the time of 2 μ s, shutdown electric current is less than 1 μ A.LT3743 driving chip uses fixed frequency average-current mode to carry out fine adjustment inductive current, and degree of regulation is ± 6%.Averagecurrent mode control technology can accurately follow current set point, and noise inhibiting ability is strong, and without the need to slope compensation, can be used in most of circuit, be good selection for current control circuit.
Laser display driver module 13 of the present invention is connected with drive current detection module 15, according to the size of the final actual output driving current of laser display driver module 13, the size that drive current detection module 15 detects this drive current obtains sampled signal, and is amplified by sample acquisitions and carry out the respective handling such as analog-to-digital conversion and convert sampled signal to corresponding digital signal from analog signal format.Drive current detection module 15 is connected with central processing module 11 more afterwards, the sampled signal of digital signals format is fed back to central processing module 11, central processing module 11 obtains the size of actual output driving current according to this sampled signal, to run business into particular one inching, to reach the object exporting accurate drive current.
The trickle adjustment that central processing module 11 does herein uses PID to control adjustment, because digital controlled signal is to analog control signal, to simulation High-current output, arrive actual output large driven current density electric current again, whole process signal conversion is more, and relate to large driven current density, higher to device parameter requirements, the actual drive current exported hardly may be identical with the value of initial setting.Therefore select PID to control to adjust digital controlled signal rapidly, make its drive current controlling actual output quick, be stabilized in accurately in the typical set value of system preliminary examination setting.Central processing module 11 adjusts the digital controlled signal of rear output as shown in the formula expression:
In formula, i represents i-th moment under discrete-time system, n represents system n-th moment, Vu represents that the digital controlled signal that central processing module exports, Kp are proportionality coefficient, and Ki is integral coefficient, Kd is differential coefficient, Vi represents that the sampled signal that i-th moment drive current detection module returns, Vn represent the sampled signal that the n-th moment drive current detection module returns, and V represents the typical set value that system preliminary examination is arranged.
As shown in Figure 3, central processing module 11 carrys out transmission of digital control signal by SPI serial line interface, module 12 is set by drive current digital controlled signal is converted to CTRL_H and CTRL_L analog control voltage signal, control the current value of the stable high/low currents of setting two respectively.Last drive current detection module 15 obtains sampled signal by sample acquisitions, and converts sampled signal to corresponding digital signal from analog signal format, feeds back to central processing module 11.
In addition, PWM and CTRL_SEL is digital signal, directly controls laser display driver module 13 by central processing module 11, and the current value being used for realizing PWM light modulation and high/low currents is respectively selected.Pulse width modulation (PWM) is carried out in the selection that central processing module 11 directly controls the enable of laser display driver module 13 and high/low currents by PWM and CTRL_SEL two digital signals, better to carry out fast reaction more accurately, thus further to ensure the steady-working state of laser.
Supply module 16 and the central processing module 11 of present system, drive current arranges module 12, drive current detection module 15, and laser display driver module 13 is connected, and system power supply module 16 provides power supply to supply for whole system of the present invention.Wherein central processing module 11, drive current arranges module 12, drive current detection module 15 is digital circuit, it is desirable that digital power, and laser display driver module 13 is analog circuit, it is desirable that high-power analog power, digital power and analog power mutually isolated, reduce mutual interference to greatest extent.
Be illustrated in figure 2 workflow diagram of the present invention, comprise initialization step, drive job step and set-up procedure.
Initialization step comprises step S1 to step S3.After system power supply, carry out step S1 successively after each module powers on, central processing module 11 powers on through reset, carries out the initialization of system in sheet, and presets drive current desired value.Step S2, after central processing module 11 initialization success, by enable for laser display driver module 13.Drive current arranges the standby condition that module 12 enters output driving current, waits for the control signal of central processing module.Step S3, central processing module 11, according to initial setting up, reads the drive current desired value set in its internal storage unit.
Drive job step to comprise step S4 to step S7, step S4, through the process computing of central processing module 11 to this drive current desired value, export corresponding digital controlled signal.Step S5, according to digital controlled signal, drive current arranges module 12 and exports corresponding analog control signal.Step S6, laser display driver module 13 according to the size output driving current of analog control voltage signal in high power semiconductor lasers 14.Step S7, this drive current Direct driver high power semiconductor lasers 14 carries out work.
Set-up procedure comprises step S8 to step S10.Step S8, final actual drive current obtains sampled signal by drive current detection module 15 sample acquisitions, and this sampled signal is analog signal.Step S9, convert this sampled signal to digital signal by drive current detection module 15, the sampled signal of this digital signals format feeds back to central processing module 11 the most at last.The feedback information of the comprehensive initial set value of step S10 central processing module 11 and sampled signal, digital controlled signal is run business into particular one inching, carry out the digital controlled signal after driving job step to export fine setting again, make finally to be controlled to export accurate drive current by this digital controlled signal, ensure the normal table work of high power semiconductor lasers 14 to greatest extent.
Be illustrated in figure 4 of the present invention a kind of take LT3743 as the control signal of typical apply and the waveform of output current of the laser display driver module of core.As can be seen from waveform, typical apply of the present invention can ensure stable output driving current waveform.Laser can work in pulse current type of drive, the duty ratio of output pulse waveform can control continuously adjustabe by central processing module within the specific limits, and can ensure that laser still can trouble free service when voltage open and close moment and certain external disturbance, automatically output driving current can be stopped under the extreme cases such as overcurrent overheat.The ripple of output voltage waveforms is more satisfactory, and size, in allowed band, can not cause the obvious loss of power output.
Be illustrated in figure 6 of the present invention a kind of take MAX4073T as the circuit diagram of the drive current detection module of core.This chip is low-power consumption, the current detecting chip of compact, ± 1% gamut accuracy, and peripheral circuit is simple, easy to use.This example chips front end access precision resister, this precision resister is serially connected in the output of the last drive current of drive system of the present invention, to ensure that the drive current size in the actual high power semiconductor lasers 14 of Measurement accuracy to greatest extent obtains sampled signal.This sampled signal is through the process of current detecting chip, and OUT pin can directly export corresponding analog voltage.Consult Fig. 6, at the conventional high precision analogue conversion chip U5 of detection magnitude of voltage output pin access one of current detecting chip (MAX4073T), this magnitude of voltage is converted to corresponding digital signal, so far, the sampled signal of actual drive current size can be obtained more accurately, complete the testing process of whole drive current, just can directly feed back to central processing module 11 afterwards, so that central processing module 11 adjusts the size of digital controlled signal in time according to actual output driving current size, to ensure the accurate stable of the last output driving current signal of whole system.
For the sampled signal that drive current detection module 15 feeds back to, central processing module 11 is made a response rapidly and is adjusted the digital controlled signal of output in time, pid control algorithm is mainly used to adjust herein, be used for adjusting digital controlled signal rapidly, make its actual output driving current quick, be stabilized in accurately in the typical set value of system preliminary examination setting, the digital controlled signal after adjustment is as shown in the formula expression:
In formula, i represents i-th moment under discrete-time system, n represents system n-th moment, Vu represents that the digital controlled signal that central processing module exports, Kp are proportionality coefficient, and Ki is integral coefficient, Kd is differential coefficient, Vi represents that the sampled signal that i-th moment drive current detection module returns, Vn represent the sampled signal that the n-th moment drive current detection module returns, and V represents the typical set value that system preliminary examination is arranged.
As shown in Figure 7, be the analogous diagram of driving method output driving current of the present invention.Can see by figure, detection according to drive current detection module is fed back, central processing module adjustment digital controlled signal, controls the actual output driving current of adjustment with the typical set value 3A of preliminary examination drive current for benchmark, carry out Fast Convergent, be finally stabilized in typical set value accurately.The reliable and stable work of final guarantee high power laser.
Protection content of the present invention is not limited to above embodiment.Under the spirit and scope not deviating from inventive concept, the change that those skilled in the art can expect and advantage are all included in the present invention, and are protection range with appending claims.
Claims (8)
1. a drive system for high power semiconductor lasers, is characterized in that, comprising:
Central processing module (11), it generates digital controlled signal;
Drive current arranges module (12), and it is connected with described central processing module (11), for generating analog control signal according to described digital controlled signal;
Laser display driver module (13), itself and described drive current arrange module (12) and are connected, for generating drive current according to described analog control signal;
High power semiconductor lasers (14), it is connected with described laser display driver module (13), for carrying out laser display according to drive current;
Drive current detection module (15), it is connected with described central processing module (11) and described high power semiconductor lasers (14) respectively, is converted to digital signal for gathering described drive current and transfers in described central processing module (11); And
Supply module (16), it arranges module (12), described laser display driver module (13) and described drive current detection module (15) respectively and is connected and provides the power supply needed for work to supply with described central processing module (11), described drive current.
2. the drive system of high power semiconductor lasers as claimed in claim 1, it is characterized in that, described central processing module (11) is connected with described laser display driver module (13) further, described central processing module (11) carries out pulse width modulation according to the enable signal of described laser display driver module (13) and electric current, stablizes the operating state of described laser display driver module (13).
3. the drive system of high power semiconductor lasers as claimed in claim 1, it is characterized in that, described supply module (16) comprises digital power system power supply and simulation power supply, and described digital power system power supply arranges module (12) with described central processing module (11), described drive current respectively and described drive current detection module (15) is connected; Described simulation power supply is connected with described laser display driver module (13).
4. a driving method for the drive system of the high power semiconductor lasers as described in any one of claims 1 to 3, is characterized in that, comprises the steps:
Initialization step, drive system described in initialization also presets drive current desired value;
Drive job step, described drive system generates digital controlled signal according to described drive current desired value, and generates the work of drive current driving high power semiconductor lasers according to described digital controlled signal;
Set-up procedure, digital controlled signal described in Detection and adjustment, and re-start described driving job step and regenerate drive current described high power semiconductor lasers is driven.
5. the driving method of the drive system of high power semiconductor lasers as claimed in claim 4, it is characterized in that, described initialization step comprises the steps:
Step one: described central processing module (11) carries out Initialize installation, presets drive current desired value in described central processing module (11);
Step 2: described central processing module (11) drives described laser display driver module (13) to work;
Step 3: described central processing module (11) reads the inner drive current desired value stored.
6. the driving method of the drive system of high power semiconductor lasers as claimed in claim 4, it is characterized in that, described driving job step comprises the steps:
Step 4: described central processing module (11) generates digital controlled signal according to described drive current desired value.
Step 5: described drive current arranges module (12) and generates analog control signal according to described digital controlled signal;
Step 6: described laser display driver module (13) generates drive current according to described analog control signal and inputs described high power semiconductor lasers (14);
Step 7: described high power semiconductor lasers (14) carries out laser display according to described drive current.
7. the driving method of the drive system of high power semiconductor lasers as claimed in claim 4, it is characterized in that, described set-up procedure comprises the steps:
Step 8: described drive current detection module (15) gathers described drive current and obtains sampled signal;
Step 9: described sampled signal is converted to digital signal from analog signal by described drive current detection module (15), and transfers to described central processing module (11);
Step 10: described central processing module (11) analyzes described sampled signal, and adjust described digital controlled signal according to described sampled signal and re-start described driving job step.
8. the driving method of the drive system of high power semiconductor lasers as claimed in claim 7, it is characterized in that, the digital controlled signal that described central processing module (11) adjusts is as shown in the formula expression:
In formula, i represents i-th moment under discrete-time system, n represented for the n-th moment, Vu represents that the digital controlled signal that described central processing module exports, Kp are proportionality coefficient, and Ki is integral coefficient, Kd is differential coefficient, Vi represents that the sampled signal that i-th moment drive current detection module returns, Vn represent the sampled signal that the n-th moment drive current detection module returns, and V represents the typical set value that system preliminary examination is arranged.
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| WO2020253448A1 (en) * | 2019-06-20 | 2020-12-24 | 青岛海信激光显示股份有限公司 | Laser projection device |
| US11831126B2 (en) | 2019-06-20 | 2023-11-28 | Hisense Laser Display Co., Ltd | Laser projection device |
| CN112221020A (en) * | 2020-10-14 | 2021-01-15 | 武汉博激世纪科技有限公司 | Semiconductor laser galvanometer treatment system |
| WO2022127077A1 (en) * | 2020-12-16 | 2022-06-23 | 上海禾赛科技有限公司 | Transmitter circuit for laser radar and method for detecting driving current of transmitter circuit |
| CN113625257A (en) * | 2021-08-06 | 2021-11-09 | 中国科学院光电技术研究所 | Laser self-checking method suitable for space rendezvous and docking laser radar |
| CN113625257B (en) * | 2021-08-06 | 2023-07-21 | 中国科学院光电技术研究所 | Laser self-checking method suitable for space intersection docking laser radar |
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