CN108390253A - The driving device of semiconductor laser - Google Patents
The driving device of semiconductor laser Download PDFInfo
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- CN108390253A CN108390253A CN201810162542.7A CN201810162542A CN108390253A CN 108390253 A CN108390253 A CN 108390253A CN 201810162542 A CN201810162542 A CN 201810162542A CN 108390253 A CN108390253 A CN 108390253A
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- semiconductor laser
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- controller
- temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The present invention relates to a kind of driving devices of semiconductor laser.The driving device includes：Drive module is connect with semiconductor laser, and drive module provides driving current for semiconductor laser；Current monitoring module, the value for real-time monitoring driving electric current and output driving current；Controller is connect with current monitoring module, and controller judges whether driving current meets the requirements according to the value of driving current, and the working condition of semiconductor laser is controlled according to judging result.Above-mentioned driving device, can be to avoid driving driving current when undesirable, the case where semiconductor laser still works, it is ensured that semiconductor laser is worked when driving current meets the requirements always.I.e. semiconductor laser always works under stable driving current, and semiconductor laser is avoided to be damaged under unstable driving current, to effective protection semiconductor laser.
Description
Technical field
The present invention relates to laser technology field, more particularly to a kind of driving device of semiconductor laser.
Background technology
Semiconductor laser is also known as laser diode, is to use semi-conducting material as the laser of operation material.Common work
There are GaAs (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulphide (ZnS) etc. as substance.Semiconductor laser is most real
With most important a kind of laser.Due to these advantages, semiconductor laser is beaten in laser communication, optical storage, optical circulator, laser
It print, ranging and radar etc. and has been widely used.
Semiconductor laser can also be applied in Terahertz generating system, to test the light path of Terahertz generating system.
Specifically, Terahertz generating system includes photoconductive transmitting antenna, for example ultrafast laser can be utilized to excite photoconduction transmitting day
Line is to generate THz wave, the laser that ultrafast laser such as femto-second laser generates.And under normal circumstances, Terahertz generating system
Used laser is black light, therefore, in order to which the light path in Terahertz generating system meets the requirements, is needed in advance using half
The laser that conductor laser generates debugs the light path of Terahertz generating system.The laser generated by semiconductor laser makes
Light path visualizes, and facilitates staff to debug light path, it is ensured that light path meets the requirements.Semiconductor laser is by current excitation, therefore,
Semiconductor laser needs to be arranged special driving circuit and gives driving current excitation.However, driving circuit tends not to stablize
Ground drives semiconductor laser work, and semiconductor laser is caused easily to damage.
Invention content
Based on this, it is necessary to tend not to be stably driven with semiconductor laser work for driving circuit, cause partly to lead
The problem of body laser easily damages provides a kind of driving device of semiconductor laser.
A kind of driving device of semiconductor laser, the driving device include：
Drive module is connect with the semiconductor laser, and the drive module provides drive for the semiconductor laser
Streaming current；
Current monitoring module, the value for monitoring the driving current and output driving current in real time；
Controller is connect with the current monitoring module, and the controller judges to drive according to the value of the driving current
Whether electric current meets the requirements, and the working condition of the semiconductor laser is controlled according to judging result.
The driving device of above-mentioned semiconductor laser monitors the driving electricity of semiconductor laser with electric current monitoring modular in real time
The value of driving current is fed back to controller by stream, current monitoring module.Controller judges driving current according to the value of driving current
Whether meet the requirements, and controls the work of semiconductor laser according to judging result.This way it is possible to avoid driving driving current exists
When undesirable, the case where semiconductor laser still works, it is ensured that semiconductor laser is met in driving current always
It is required that when work.I.e. semiconductor laser always works under stable driving current, avoids semiconductor laser unstable
Driving current under be damaged, to effective protection semiconductor laser.
The current monitoring module includes the first current monitoring unit and the second current monitoring in one of the embodiments,
Unit；The first current monitoring unit is used to monitor the driving current of the semiconductor laser in real time, and by the driving
The value of electric current feeds back to the controller；The second current monitoring unit is used to monitor the output electricity of the drive module in real time
Stream, and the value of the output current is fed back into the controller；Wherein, the controller for judge the output current with
Whether the difference between the driving current meets preset standard；If the difference meets the preset standard, the controller
It is additionally operable to judge that the driving current meets the requirements, and controls the semiconductor laser conducting.
The controller is additionally operable to control the unlatching of the drive module, closing and the drive in one of the embodiments,
The size of dynamic module output current；Wherein, when the semiconductor laser needs electrifying startup, the controller is for controlling
The output current of the drive module is gradually increased to the first current value by zero, and the semiconductor laser is placed in and is not turned on
State；When the output current of the drive module increases to first current value, the controller is additionally operable to described half
Conductor laser is placed in conducting state, and the output current for controlling the drive module simultaneously increases to second by the first current value
Current value；When the output current of the drive module increases to second current value, the controller is described for controlling
Drive module exports constant current；When the semiconductor laser needs to close, the controller is for controlling the driving
The output current of module is decreased to first current value by second current value, and the semiconductor laser is placed in and is led
Logical state；When the output current of the drive module is decreased to first current value, the controller is additionally operable to will be described
Semiconductor laser is placed in off, and the output current for controlling the drive module simultaneously is decreased to by the first current value
Zero.
The drive module further includes protective unit and driving unit in one of the embodiments,；The protective unit
It is connected between the controller and the driving unit；The protective unit is for protecting the driving unit；The control
Device is additionally operable to control the closing and unlatching of the driving unit.
In one of the embodiments, when the driving current is not inconsistent standardization, the controller first closes described half
Conductor laser, then control the driving unit and close.
The driving unit further includes current limiting device in one of the embodiments, is used for the driving unit
Output current be limited within the scope of predetermined current.
The protective unit includes pressure limiting circuit, filter circuit and buffer circuit in one of the embodiments,；Wherein,
The pressure limiting circuit is used to limit the voltage of the driving unit；The filter circuit is for filtering out interference and/or reducing surge；
The buffer circuit is for being isolated the controller and the driving unit.
Driving device further includes control switch and protection switch in one of the embodiments,；The protection switch and institute
Semiconductor laser parallel connection is stated, the protection switch is opened when the semiconductor laser is closed, to avoid the semiconductor
Laser is closed by electrostatic damage, the protection switch when the semiconductor laser is opened；The control switch connection
Between protection switch and the controller, the control switch is for controlling opening or closing for the protection switch.
Driving device further includes in one of the embodiments,：
Temperature collecting module, the temperature for acquiring the semiconductor laser；
Temperature adjustment module, the temperature for adjusting the semiconductor laser；
The controller is separately connected with the temperature collecting module and the temperature adjustment module, the controller according to
The temperature value of the temperature collecting module acquisition controls the work of the temperature adjustment module, so that the semiconductor laser
Temperature is in preset temperature range.
The temperature collecting module includes temperature acquisition equipment and processing circuit, the temperature in one of the embodiments,
Degree collecting device is used to detect the temperature of the semiconductor laser, and exports detectable signal；The processing circuit and described half
Conductor laser and the controller are separately connected, and the processing circuit is used to the detectable signal being changed into temperature signal,
And the temperature signal is transmitted to the controller.
Description of the drawings
Fig. 1 is the structure diagram of the driving device of the semiconductor laser of first embodiment；
Fig. 2 is the structure diagram of the driving device of second embodiment；
Fig. 3 is the circuit diagram of the driving device of embodiment shown in Fig. 2；
Fig. 4 is the structure diagram of the driving device of 3rd embodiment；
Fig. 5 is the circuit diagram of the temperature collecting module and temperature adjustment module in embodiment illustrated in fig. 4.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
Fig. 1 is the structure diagram of the driving device of the semiconductor laser of first embodiment.A kind of semiconductor laser 500
Driving device 100, for drive semiconductor laser 500 work.Driving device 100 includes drive module 110, current monitoring
Module 120 and controller 130.
Drive module 110 is connect with semiconductor laser 500, and drive module 110 is that semiconductor laser 500 provides driving
Electric current.
Value of the current monitoring module 120 for real-time monitoring driving electric current and output driving current.Current monitoring module 120
The input current of semiconductor laser 500 can be measured indirectly, such as by measuring and 500 concatenated resistance of semiconductor laser
The current value of device monitors.The value of driving current is fed back to controller 130 by current monitoring module 120.
Controller 130 is connect with current monitoring module 120, and receives the value of driving current.Controller 130 is according to driving electricity
The value of stream judges whether driving current meets the requirements, and the working condition of semiconductor laser 500 is controlled according to judging result.Example
Such as, default drive current range can be set in controller 130.As long as controller 130 compares the value of driving current and default drive
Streaming current range, then may determine that whether driving current meets the requirements.If driving current meets the requirements, drive module 110
Working properly, controller 130 controls the work of semiconductor laser 500 (so that semiconductor laser 500 is in open state).If
Driving current is undesirable, then drive module 110 works abnormal, and controller 130 controls semiconductor laser 500 and closes.
The driving device 100 of above-mentioned semiconductor laser 500 monitors semiconductor laser in real time with electric current monitoring modular 120
The value of driving current is fed back to controller 130 by the driving current of device 500, current monitoring module 120.Controller 130 is according to drive
The value of streaming current judges whether driving current meets the requirements, and the work of semiconductor laser 500 is controlled according to judging result.This
Sample, can be to avoid driving driving current when undesirable, the case where semiconductor laser 500 still works, it is ensured that partly lead
Body laser 500 is worked when driving current meets the requirements always.I.e. semiconductor laser 500 always works in stable drive
Under streaming current, semiconductor laser 500 is avoided to be damaged under unstable driving current, to which effective protection semiconductor swashs
Light device 500.
Fig. 2 is the structure diagram of the driving device of second embodiment.Fig. 3 is the driving device of embodiment shown in Fig. 2
Circuit diagram.As shown in Figures 2 and 3, driving device 200 includes drive module, current monitoring module 220 and controller 230,
The setting of drive module, current monitoring module 220 and controller 230 can refer to embodiment shown in FIG. 1.
Driving device 200 further includes control switch 240 and protection switch 250.Protect switch 250 and semiconductor laser
500 is in parallel, and protection switch 250 is opened when semiconductor laser 500 is closed, to avoid semiconductor laser 500 by electrostatic
Damage, protection switch 250 are closed when semiconductor laser 500 is opened.Therefore, protection switch 250 can swash to avoid semiconductor
Light device 500 is in transport from electrostatic damage, effective protection semiconductor laser 500.In the present embodiment, protection switch 250 can
It, can be with to use single-pole double-throw relay, the normally-closed circuit of single-pole double-throw relay to be connected in parallel on the both ends of semiconductor laser 500
Short-circuit semiconductor laser 500.
Control switch 240 is connected between protection switch 250 and controller 230, and control switch 240 is opened for controlling protection
Pass 250 opens or closes.In the present embodiment, triode may be used in control switch 240.When triode ON, single-pole double throw
Relay disconnects, and semiconductor laser 500 opens (conducting).When triode is not turned on, single-pole double-throw relay is opened, at this moment,
The normally-closed circuit of single-pole double-throw relay works normally, and semiconductor laser 500 closes (being not turned on).Therefore, controller 230
The open and close of the i.e. controllable semiconductor laser diode of working condition of triode are controlled, it is easy to control and safe.
Driving device 200 further includes digital analog converter 260.Digital analog converter 260 is connected to controller 230 and drive module
Between.Digital analog converter 260 is used to the control voltage signal that controller 230 exports being converted into analog signal by digital signal,
So that drive module can identify.
Driving device 200 further includes analog-digital converter 270.Analog-digital converter 270 is connected to current monitoring module 220 and control
Between device 230 processed, analog-digital converter 270 is used to the monitoring signals that current monitoring module 220 exports being converted to digital signal, with
Just controller 230 easily identifies.
Drive module includes protective unit 211 and driving unit 212.Protective unit 211 is connected to controller 230 and driving
Between unit 212.Protective unit 211 is for protecting driving unit 212.Specifically, protective unit 211 includes pressure limiting circuit
211A, filter circuit 211B and buffer circuit 211C.In the present embodiment, pressure limiting circuit 211A, filter circuit 211B and buffering electricity
Road 211C is set in turn on digital analog converter 260 to the circuit of driving unit 212.
Pressure limiting circuit 211A is used to limit the voltage of driving unit 212.Pressure limiting circuit 211A include first resistor (Fig. 2 and
Fig. 3 is not shown) and divider resistance (Fig. 2 and Fig. 3 are not shown).The output end of the input terminal and digital analog converter 260 of first resistor
Connection, the output end of first resistor and the input terminal of filter unit connect.One end of divider resistance is grounded, the other end and the first electricity
The output end of resistance connects.For example, the resistance value of first resistor is 5K Ω, the resistance value of divider resistance is 10K Ω, then divider resistance can
The partial pressure that 2/3rds are carried out with the voltage control signal exported to controller 230, the voltage in circuit is limited in centainly
In range, circuit is protected.
Filter circuit 211B is for filtering out interference and/or reducing surge.Filter circuit 211B includes second resistance and capacitance.
The input terminal of second resistance and the output end of first resistor connect, and the output end of second resistance is connect with buffer circuit 211C.Electricity
One end of appearance is grounded, and the output end of the other end and second resistance connects.In the present embodiment, the resistance value of second resistance is 33K Ω, electricity
Capacitance is 1uF.In this way, second resistance and capacitance form low-pass filter, the noise introduced in filtering circuit and existing interference,
To eliminate the noise that may be introduced into driving current and interference in advance.Filter circuit 211B can also be by the variation edge of driving current
Slow down, reduces the interference such as the surge that transition is brought damage semiconductor laser 500.
Buffer circuit 211C includes the first operational amplifier.First operational amplifier includes first input end and the second input
End and the first output end.First input end is connect with second resistance output end.The input terminal of first output end and driving unit 212
Connection, and the first output end is connect with the second input terminal, i.e., the voltage signal of output is fed back to the first output by the first output end
End.First operational amplifier constitutes buffer.In this way, buffer circuit 211C isolation controllers 230 and driving unit 212 so that
Driving unit 212 is from interference.
Driving unit 212 includes power amplifier 212A and feedback circuit 212B.Power amplifier 212A includes that third is defeated
Enter end and the 4th input terminal and second output terminal, third input terminal are connect with the first output end of the first operational amplifier.Second
Output end is connect with semiconductor laser 500, and power amplifier 212A is by second output terminal output current, and by output current
It is transferred to semiconductor laser 500.Second output terminal is connect with the 4th input terminal by feedback circuit 212B, and second output terminal will
Output current feeds back to the 4th input terminal of power amplifier 212A by feedback circuit 212B.
Driving unit 212 further includes 3rd resistor (Fig. 2 and Fig. 3 are not shown).Feedback circuit 212B includes the capacitance of parallel connection
And resistance.3rd resistor one end is connect with the output end of feedback circuit 212B, other end ground connection.Power amplifier 212A and feedback
Circuit 212B and 3rd resistor form constant-current source together, i.e. the output current of driving unit 212 is constant current, it can be ensured that is swashed
Optical semiconductor laser 500 being capable of steady operation.In the present embodiment, the second output terminal of power amplifier 212A passes through the 4th electricity
Resistance (Fig. 2 and Fig. 3 are not shown) is connect with semiconductor laser 500.The driving current of semiconductor laser 500 is semiconductor laser
The input current of 500 input terminal of device.
Driving unit 212 further includes current limiting device 212C, and current limiting unit is used for the output of driving unit 212
Current limit is within the scope of predetermined current.Current limiting device 212C can be the 5th resistance, and the 5th resistance one end connects power
The second output terminal of amplifier 212A, other end ground connection.The output current of power amplifier 212A is limited in pre- by the 5th resistance
If in current range, so that semiconductor laser 500 is operated under safe driving current.For example, power amplifier 212A
Output current reach 5A, much meet the needs of semiconductor laser 500, the output of the 5th resistance limiting power amplifier 212A
Electric current.Therefore, the resistance value 57K Ω of the 5th resistance are arranged in the design, by the current limit of power amplifier within 200mA, so that half
500 trouble free service of conductor laser.
Power amplifier 212A is additionally provided with enabled switch (Fig. 2 and Fig. 3 are not shown) and overheating protection pin (Fig. 2 and Fig. 3
It is not shown).Controller 230 is separately connected with enabled switch and overheating protection pin.Controller 230 controls work(by enabled switch
The open and close of rate amplifier 212A.Similarly, controller 230 protects power amplifier 212A by overheating protection pin.This
In embodiment, enabled switch and overheating protection pin link together, and simplify circuit.
In the present embodiment, current monitoring module 220 includes the first current monitoring unit 221 and the second current monitoring unit
222.Driving current of the first current monitoring unit 221 for monitoring semiconductor laser 500 in real time, and by the value of driving current
Feed back to controller 230.Second current monitoring unit 222 is used for the output current of real-time monitoring driving module, and will output electricity
The value of stream feeds back to controller 230.That is the first current monitoring unit 221 and the second current monitoring unit 222 monitor output respectively
Electric current and driving current.So that the monitoring of driving current is accurate.
First current monitoring unit 221 includes current monitoring amplifier.Two input terminals of current monitoring amplifier connect respectively
The both ends of the 4th resistance are connected on, can easily monitor the value for the driving current for being input to semiconductor laser 500 in this way.Electric current
The output end of monitor AMP is connect by analog-digital converter 270 with controller 230, i.e., the drive that current monitoring amplifier monitors
The value of streaming current is transferred to controller 230 by analog-digital converter 270.
Second current monitoring unit 222 includes second operational amplifier, the input terminal and work(of second operational amplifier
The output end of rate amplifier 212A connects.The output end of second operational amplifier is connected by analog-digital converter 270 and controller 230
It connects.I.e. the value of the output current of driving unit 212 is transferred to by the output end of second operational amplifier by analog-digital converter 270
Controller 230.The value of the output current of driving unit 212 is also fed back to the second operation and put by the output end of second operational amplifier
Another input terminal of big device.Second operational amplifier completes the monitoring of the output current of driving unit 212.
Judge whether the difference of output current and driving current meets preset standard by controller 230.Controller 230 is in difference
When value meets preset standard, judgement driving current meets the requirements, and controls the conducting of semiconductor laser 500.Controller 230 is in difference
When value does not meet preset standard, judgement driving current is undesirable, and controls the closing of semiconductor laser 500, controls power
Amplifier 212A is closed.For example, preset standard is 5mA.It is less than or waits in the difference of the value of the value and driving current of output current
When preset standard, illustrate that drive module work complies with standard, semiconductor laser 500 can work normally.Conversely, then illustrating
Drive module work is not inconsistent standardization, can be dangerous if semiconductor laser 500 works on, or even can damage.
Controller 230 exports control voltage signal, and control voltage signal is exported to drive module, will by drive module
Control voltage signal is changed into the driving current of semiconductor laser 500.Controller 230 is additionally operable to opening for control drive module
It opens, close and its size of output current.Controller 230 will close semiconductor and swash when judging that driving current is not inconsistent standardization
Light device 500 will also close drive module.It waits for after adjusting drive module so that when driving current complies with standard, can divide again
It Da Kai not semiconductor laser 500 and drive module.In the present embodiment, when controller 230 judges that driving current is not inconsistent standardization,
Semiconductor laser 500 is first closed, then controls the closing of driving unit 212.This way it is possible to avoid driving current is first closed, semiconductor
The damage that laser 500 is powered off suddenly.It therefore, can be with effective protection semiconductor laser 500.
When semiconductor laser 500 opens and closes (i.e. start-up operation and power cut-off), controller 230 is to driving mould
The control process of block and semiconductor laser 500 is as follows：
When semiconductor laser 500 needs electrifying startup, controller 230 first controls the output current of drive module by zero
The first current value is increased to, and semiconductor laser 500 is placed in not on-state, i.e., controller 230 controls semiconductor simultaneously
The holding of laser 500 is not turned on.Secondly, when the output current of drive module increases to the first current value, controller 230 is also used
In semiconductor laser 500 is placed in conducting state, and the output current for controlling drive module simultaneously is increased by the first current value
To the second current value.Controller 230 controls semiconductor laser 500 and is connected, while controlling the output current of drive module by the
One current value increases to the second current value.Then, when the output current of drive module increases to the second current value, controller
230 control drive modules export constant current.In this way, when driving device 200 starts, can to avoid in circuit in electric current by 0
Caused interference during beginning saltus step leads to excessive driving current output and surge problem, to avoid damage from partly leading
Body laser 500.Therefore, such control process can protect semiconductor laser 500, extend semiconductor laser 500
Service life.
When semiconductor laser 500 needs to close, controller 230 is used to control the output current of drive module by second
Current value is decreased to the first current value, and semiconductor laser 500 is placed in conducting state；Subtract in the output current of drive module
When as low as the first current value, controller 230 is additionally operable to semiconductor laser 500 being placed in off, and controls driving simultaneously
The output current of module is decreased to zero by the first current value.I.e. during this, controller 230 first controls the output of drive module
Electric current is decreased to the first current value by the second current value, while controller 230 controls semiconductor laser 500 and is held on.Its
Secondary, controller 230 controls semiconductor laser 500 and closes, while the output current for controlling drive module is subtracted by the first current value
As low as 0.In this way, when semiconductor laser 500 is closed, the output current of drive module is first decreased to first by the second current value
Current value, then it is decreased to 0.I.e. the output current of drive module is slowly decreased to 0 by the second current value.It in this way can be to avoid circuit
In caused interference during the unexpected saltus step of electric current, cause excessive driving current to export and surge problem, to keep away
Exempt to damage semiconductor laser 500.Therefore, such control process can protect semiconductor laser 500, extend semiconductor and swash
The service life of light device 500.
It should be noted that the second current value is more than the first current value, the first current value is more than zero.Above-mentioned first current value
It can be arranged according to the actual demand of semiconductor laser 500 with the second current value.
Fig. 4 is the structure diagram of the driving device of 3rd embodiment；Fig. 5 is the temperature acquisition mould in embodiment illustrated in fig. 4
The circuit diagram of block and temperature adjustment module.Driving device 300 includes drive module (Fig. 4 and Fig. 5 are not shown), current monitoring
Module (Fig. 4 and Fig. 5 are not shown) and controller 300, the setting of drive module, current monitoring module and controller 300 can refer to
Embodiment shown in FIG. 1.
As shown in Figure 4 and Figure 5, driving device 300 further includes temperature collecting module 380 and temperature adjustment module 390.Temperature
Acquisition module 380 is connect with controller 300, and temperature collecting module 380 is used to acquire the temperature of semiconductor laser.
Temperature collecting module 380 includes temperature acquisition equipment 381 and processing circuit 382, and temperature acquisition equipment 381 is for visiting
The temperature of semiconductor laser (Fig. 4 and Fig. 5 are not shown) is surveyed, and exports detectable signal.Temperature acquisition equipment 381 is passed including temperature
Sensor.Temperature sensor is set near semiconductor laser, for monitoring temperature when semiconductor laser work.Temperature
Sensor can be two or more.Different temperature sensors can be located at the different direction of semiconductor laser, with detection
The temperature of the different direction of semiconductor laser.Processing circuit 382 is separately connected with temperature acquisition equipment 381 and controller 300,
Processing circuit 382 is used to detectable signal being changed into temperature signal, and temperature signal is transmitted to controller 300.
Temperature adjustment module 390 is connect with controller 300, and temperature adjustment module 390 is for adjusting semiconductor laser
Temperature.The work of temperature adjustment module 390 is controlled according to the temperature value that temperature collecting module 380 acquires by controller 300, so that
The temperature of semiconductor laser is in preset temperature range.Temperature adjustment module 390 includes thermostat unit 391, controller
300 when the temperature of semiconductor laser is higher than the upper limit of preset temperature range, and control thermostat unit 391 freezes, so that
Semiconductor laser cools down.Peltier may be used in thermostat unit 391.Temperature of the controller 300 in semiconductor laser
Less than preset temperature range lower limit when, control thermostat unit 391 heat so that semiconductor laser heat up.Default temperature
Spend such as 10 ° to 25 ° of range.In this way it can be ensured that semiconductor laser always works in preset temperature range so that partly lead
Body laser steady operation extends the service life of semiconductor laser.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (11)
1. a kind of driving device of semiconductor laser, which is characterized in that the driving device includes：
Drive module is connect with the semiconductor laser, and the drive module provides driving electricity for the semiconductor laser
Stream；
Current monitoring module, the value for monitoring the driving current and output driving current in real time；
Controller is connect with the current monitoring module, and the controller judges driving current according to the value of the driving current
Whether meet the requirements, and controls the working condition of the semiconductor laser according to judging result.
2. driving device according to claim 1, which is characterized in that the current monitoring module includes the first current monitoring
Unit and the second current monitoring unit；
The first current monitoring unit is used to monitor the driving current of the semiconductor laser in real time, and the driving is electric
The value of stream feeds back to the controller；
The second current monitoring unit is used to monitor the output current of the drive module in real time, and by the output current
Value feeds back to the controller；
Wherein, the controller is for judging whether the difference between the output current and the driving current meets pre- bidding
It is accurate；If the difference meets the preset standard, the controller is additionally operable to judge that the driving current meets the requirements, and controls
The semiconductor laser conducting.
3. driving device according to claim 1, which is characterized in that the controller is additionally operable to control the drive module
Unlatching, close and the drive module output current size；
Wherein, when the semiconductor laser needs electrifying startup, the controller is for controlling the defeated of the drive module
Go out electric current and be gradually increased to the first current value by zero, and the semiconductor laser is placed in not on-state；In the driving
When the output current of module increases to first current value, the controller is additionally operable to the semiconductor laser being placed in and lead
Logical state, and the output current for controlling the drive module simultaneously increases to the second current value by the first current value；In the drive
When the output current of dynamic model block increases to second current value, the controller is constant for controlling the drive module output
Electric current；
When the semiconductor laser needs to close, the controller is used to control the output current of the drive module by institute
It states the second current value and is decreased to first current value, and the semiconductor laser is placed in conducting state；In the driving
When the output current of module is decreased to first current value, the controller is additionally operable to the semiconductor laser being placed in pass
Closed state, and the output current for controlling the drive module simultaneously is decreased to zero by the first current value.
4. driving device according to claim 3, which is characterized in that the drive module further includes protective unit and driving
Unit；
The protective unit is connected between the controller and the driving unit；The protective unit is for protecting the drive
Moving cell；The controller is additionally operable to control the closing and unlatching of the driving unit.
5. driving device according to claim 4, which is characterized in that described when the driving current is not inconsistent standardization
Controller first closes the semiconductor laser, then controls the driving unit and close.
6. driving device according to claim 4, which is characterized in that the driving unit further includes：
Current limiting device, for the output current of the driving unit to be limited within the scope of predetermined current.
7. driving device according to claim 4, which is characterized in that the protective unit includes pressure limiting circuit, filtered electrical
Road and buffer circuit；Wherein, the pressure limiting circuit is used to limit the voltage of the driving unit；The filter circuit is for filtering out
Interference and/or reduction surge；The buffer circuit is for being isolated the controller and the driving unit.
8. driving device according to claim 1, which is characterized in that further include control switch and protection switch；The guarantor
Shield switch is in parallel with the semiconductor laser, and the protection switch is opened when the semiconductor laser is closed, to avoid
The semiconductor laser is closed by electrostatic damage, the protection switch when the semiconductor laser is opened；The control
System switch is connected between the protection switch and the controller, and the control switch is for controlling beating for the protection switch
On or off is closed.
9. driving device according to claim 1, which is characterized in that further include：
Temperature collecting module, the temperature for acquiring the semiconductor laser；
Temperature adjustment module, the temperature for adjusting the semiconductor laser；
The controller is separately connected with the temperature collecting module and the temperature adjustment module, and the controller is according to
The temperature value of temperature collecting module acquisition controls the work of the temperature adjustment module, so that the temperature of the semiconductor laser
In preset temperature range.
10. driving device according to claim 9, which is characterized in that the temperature collecting module includes that temperature acquisition is set
Standby and processing circuit, the temperature acquisition equipment are used to detect the temperature of the semiconductor laser, and export detectable signal；Institute
It states processing circuit to be separately connected with the semiconductor laser and the controller, the processing circuit is used to believe the detection
Number it is changed into temperature signal, and the temperature signal is transmitted to the controller.
11. driving device according to claim 9, which is characterized in that the temperature adjustment module include heating unit and
Refrigeration unit, the controller is when the temperature of the semiconductor laser is higher than the upper limit of the preset temperature range, control
The refrigeration unit refrigeration, so that the semiconductor laser cools down；Temperature of the controller in the semiconductor laser
Less than the preset temperature range lower limit when, control the heating unit heats so that the semiconductor laser heat up.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810162542.7A CN108390253B (en) | 2018-02-26 | 2018-02-26 | Semiconductor laser driving device |
| PCT/CN2019/073342 WO2019161727A1 (en) | 2018-02-26 | 2019-01-28 | Drive apparatus of semiconductor laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810162542.7A CN108390253B (en) | 2018-02-26 | 2018-02-26 | Semiconductor laser driving device |
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| Publication Number | Publication Date |
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| CN108390253A true CN108390253A (en) | 2018-08-10 |
| CN108390253B CN108390253B (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810162542.7A Active CN108390253B (en) | 2018-02-26 | 2018-02-26 | Semiconductor laser driving device |
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| Country | Link |
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| CN (1) | CN108390253B (en) |
| WO (1) | WO2019161727A1 (en) |
Cited By (5)
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| CN109616867A (en) * | 2019-01-16 | 2019-04-12 | 吉林工程技术师范学院 | A kind of laser drive circuit and laser driving method with temperature-compensating |
| WO2019161727A1 (en) * | 2018-02-26 | 2019-08-29 | 深圳市太赫兹科技创新研究院有限公司 | Drive apparatus of semiconductor laser |
| CN111585157A (en) * | 2020-05-22 | 2020-08-25 | 江苏师范大学 | Numerical control driving power supply for intermediate infrared ultrafast laser |
| CN111781790A (en) * | 2019-04-04 | 2020-10-16 | 中强光电股份有限公司 | Electronic device and laser unit protection method |
| 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 |
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| CN112098046B (en) * | 2020-09-21 | 2022-06-07 | 深圳市星汉激光科技股份有限公司 | Detection system and detection method of semiconductor laser |
| CN113959492B (en) * | 2021-10-22 | 2023-01-10 | 苏州森峰智能装备有限公司 | Light path protection monitoring system of self-adaptation threshold value |
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Also Published As
| Publication number | Publication date |
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| WO2019161727A1 (en) | 2019-08-29 |
| CN108390253B (en) | 2020-10-13 |
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