CN109412012A - Laser source generating circuit and equalization methods - Google Patents
Laser source generating circuit and equalization methods Download PDFInfo
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- CN109412012A CN109412012A CN201811212894.5A CN201811212894A CN109412012A CN 109412012 A CN109412012 A CN 109412012A CN 201811212894 A CN201811212894 A CN 201811212894A CN 109412012 A CN109412012 A CN 109412012A
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- signal
- driving signal
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- module
- laser source
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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
-
- 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
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
-
- 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
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The present invention provides a kind of laser source generating circuit and equalization methods, comprising: carries out impulse modulation to input signal and obtains the laser driven module of driving signal；Generate the balance module of the equalizing signal of compensation laser driven module；The light emitting module of stable laser signal is exported based on compensated driving signal.The driving signal of laser source is generated based on input signal；Generate the equalizing signal for compensating the driving signal；And driving signal is compensated based on equalizing signal, to obtain stable driving signal；Stable optical signal is exported based on stable driving signal driving light emitting module.The present invention determines the waveform of equalizing signal according to uncompensated laser driven module output signal, to offset the non-ideal effects of PCB and laser itself；Meanwhile the operating temperature by detecting laser driven module, the coefficient of balance module is dynamically adjusted, so that output waveform does not vary with temperature.
Description
Technical field
The present invention relates to laser radar and 3D detection fields, more particularly to a kind of laser source generating circuit and equilibrium side
Method.
Background technique
The application fields such as automatic Pilot, gesture identification and machine vision require high-precision, high-resolution, real-time ranging
Function.Therefore, the laser radar technique based on TOF (Time of Flight, photon flight time) has obtained more and more extensive
Application.
Laser radar technique based on TOF, is made of transmitting terminal and receiving end.Transmitting terminal generates pulse modulated laser letter
Number, receiving end detection calculates target object from the reflected optical signal of target object, and according to the time of photon flight
Distance.Detecting distance is mainly influenced by the sensitivity of transmitting terminal power and receiving end.Therefore, in order to improve detecting distance, emit
End needs to generate the pulsed laser signal of relatively high power.
Due to the ghost effect of PCB (printed circuit board) and laser and the non-ideal effects of laser itself, directly exist
When the input terminal of laser driver adds quick step voltage signal, laser can generate of short duration oscillator signal.For difference
Laser and different peripheral circuits and PCB layout designs, the amplitude of this oscillator signal, frequency and duration are all different,
And it can be with temperature change.The oscillating optical signal of transmitting terminal will affect the detection performance of receiving end, and excessive oscillation light
Signal can damage human eye.
Therefore, how it to be directed to different lasers, temperature, proposes a kind of circuit of pervasive solution transmitting terminal oscillation problem
And method, it has also become one of those skilled in the art's urgent problem to be solved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of laser source generating circuit and
Weighing apparatus method, for solving the problems, such as Laser emission end output signal oscillation in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a kind of laser source generating circuit, the laser source
Generation circuit includes at least:
Laser driven module receives input signal, impulse modulation is carried out to the input signal, to obtain driving signal；
Balance module is connected to the both ends of the laser driven module, and according to driving signal generation compensation
The equalizing signal of laser driven module；
Light emitting module connects the output end of the laser driven module, is exported based on compensated driving signal stable
Laser signal.
Optionally, the balance module includes that phase detection unit, amplitude detection unit and equalizing signal generate unit；
The phase detection unit receives the output signal of the laser driven module, for detecting the driving signal
Rising edge and failing edge；
The amplitude detection unit receives the output signal of the laser driven module, exists for detecting the driving signal
The amplitude of the oscillator signal of rising edge and falling edge and duration；
The equalizing signal generates the output end that unit is connected to the phase detection unit and the amplitude detection unit,
According to the output signal of the phase detection unit and the amplitude detection unit in the driving signal in rising edge and decline
Along generation equalizing signal corresponding with the oscillator signal.
Optionally, the balance module is also connected with a temperature detecting module, is detected based on the temperature detecting module
Temperature information compensates the driving signal.
Optionally, the laser driven module is current-Mode Circuits structure.
Optionally, the light emitting module includes light emitting diode, and the anode of the light emitting diode connects the laser and drives
The output end of dynamic model block, cathode ground connection.
In order to achieve the above objects and other related objects, the present invention also provides a kind of equilibrium sides of laser source generating circuit
The equalization methods of method, the laser source generating circuit include at least:
The driving signal of laser source is generated based on input signal；
Waveform based on the driving signal generates the equalizing signal for compensating the driving signal；
And the oscillationg component in the driving signal is compensated based on the equalizing signal, to obtain stable driving signal；
Stable optical signal is exported based on the stable driving signal driving light emitting module.
Optionally, the method for generating the equalizing signal includes:
Detect the rising edge of the driving signal, the failing edge of the driving signal, at the driving signal rising edge
The oscillator signal of oscillator signal and the driving signal falling edge；
At the failing edge of rising edge, the driving signal based on the driving signal, the driving signal rising edge
Amplitude, delay or the pulse that the oscillator signal of oscillator signal and the driving signal falling edge adjusts the equalizing signal are wide
Degree.
Optionally, the equalization methods of the laser source generating circuit further include: the work based on the laser source generating circuit
Amplitude, delay or the pulse width of the equalizing signal are adjusted as environment temperature.
As described above, laser source generating circuit of the invention and equalization methods, have the advantages that
Laser source generating circuit and equalization methods of the invention is defeated when without balance module according to laser driven module
Waveform out, determine need equalizing signal waveform and balance module each term coefficient so that balance module rising edge and under
Drop is along euqalizing current corresponding with output optical signal waveform is generated, to offset the non-ideal effects of PCB and laser itself；Together
When, by detecting the operating temperature of laser driven module, the coefficient of balance module is dynamically adjusted, so that output waveform is not with temperature
Degree variation.
Detailed description of the invention
Fig. 1 is shown as a kind of structural schematic diagram of laser source generating circuit of the invention.
Fig. 2 is shown as the structural schematic diagram of laser driven module of the invention.
Fig. 3 is shown as the structural schematic diagram of balance module of the invention.
Fig. 4 is shown as another structural schematic diagram of laser source generating circuit of the invention.
Fig. 5 is shown as the schematic illustration of the equalization methods of laser source generating circuit of the invention.
Component label instructions
1 laser source generating circuit
11 laser driven modules
12 balance modules
121 phase detection units
122 amplitude detection units
123 equalizing signals generate unit
13 light emitting modules
14 temperature detecting modules
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to FIG. 1 to FIG. 5.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of laser source generating circuit 1, the laser source generating circuit 1 includes:
Laser driven module 11, balance module 12 and light emitting module 13.
As shown in Figure 1, the laser driven module 11 receives input signal Vin, pulse is carried out to the input signal Vin
Modulation, to obtain driving signal.
Specifically, in the present embodiment, the laser driven module 11 is current-Mode Circuits structure.As shown in Fig. 2, described
Laser driven module 11 includes the first input pipe N1, the second input pipe N2, current source S1, the first load R1 and the second load R2.
The first input pipe N1 and the second input pipe N2 constitutes differential pair tube, the first input pipe N1 and second input
The source electrode of pipe N2 is connected and is grounded after connecting the current source S1；The grid of the first input pipe N1 and the second input pipe N2
Pole connects the input signal Vin；The drain electrode of the first input pipe N1 and the second input pipe N2 pass through described respectively
One load R1 and the second load R2 connection power supply VCC；The drain electrode of the second input pipe N2 is as output end Out.
It should be noted that the structure of the laser driven module 11 includes but is not limited to cited by the present embodiment, arbitrarily
Impulse modulation can be carried out to the input signal Vin, and then the circuit structure of the light emitting module 13 is driven to be suitable for this hair
It is bright, it is numerous to list herein.
As shown in Figure 1, the balance module 12 is connected to the both ends of the laser driven module 11, and according to the driving
Signal generates the equalizing signal for compensating the laser driven module 11.
Specifically, the balance module 12 includes that phase detection unit 121, amplitude detection unit 122 and equalizing signal produce
Raw unit 123.
More specifically, the phase detection unit 121 receives the output signal (driving of the laser driven module 11
Signal), for detecting the rising edge and failing edge of the driving signal.Any phase demodulation can be used in the phase detection unit 121
Circuit is realized, numerous to list herein.
More specifically, the amplitude detection unit 122 receives the output signal (driving of the laser driven module 11
Signal), for detecting the driving signal in the amplitude and duration of rising edge and the oscillator signal of falling edge.The width
Degree detection unit 122 determines position, amplitude and the duration that oscillator signal occurs based on the amplitude of the driving signal.At this
In embodiment, by the value of the comparator driving signal and reference signal, position, the amplitude of oscillator signal are determined with this
And duration, the circuit structure of any achievable amplitude detection are suitable for the present invention, are not limited to this embodiment.
More specifically, the equalizing signal, which generates unit 123, is connected to the phase detection unit 121 and amplitude inspection
The output end for surveying unit 122, according to the output signal of the phase detection unit 121 and the amplitude detection unit 122 in institute
It states driving signal and generates equalizing signal corresponding with the oscillator signal in rising edge and failing edge.
As shown in Figure 1, the light emitting module 13 connects the output end of the laser driven module 11, it is based on compensated drive
The laser signal of dynamic stable output signal.
Specifically, in the present embodiment, the light emitting module 13 is realized using light emitting diode, the light emitting diode
Anode connects the output end of the laser driven module 11, cathode ground connection.When the driving signal is greater than leading for light emitting diode
The light emitting diode is driven to light when the pressure that is powered.
Embodiment two
As shown in figure 4, the present embodiment provides a kind of laser source generating circuit 1, with embodiment one the difference is that, institute
Stating laser source generating circuit 1 further includes temperature detecting module 14.
Specifically, the temperature detecting module 14 connects the balance module 12, and the temperature detecting module 14 detects institute
The operating temperature of laser driven module 11 is stated, and the temperature information detected based on the temperature detecting module 14 compensates the drive
Dynamic signal.
Embodiment three
As shown in figure 5, the present embodiment provides a kind of equalization methods of laser source generating circuit, the laser source generating circuit
Equalization methods include:
1) driving signal of laser source is generated based on input signal.
Specifically, in the present embodiment, the input signal Vin is modulated based on the laser driven module 11
To the driving signal of laser source.As shown in figure 5, the characteristic due to the laser driven module 11 itself is different, the laser is driven
The output signal of dynamic model block 11 can have oscillation, can by the optical signal L0 (almost the same with the driving signal) not compensated
Know, the optical signal L0 follows the current signal Iin of the input signal Vin to change, but in the electric current of the input signal Vin
There is oscillation in the rising edge and failing edge of signal Iin.
2) operating ambient temperature of waveform and the laser source generating circuit based on the driving signal generates compensation institute
State the equalizing signal of driving signal.
Specifically, rising edge, the failing edge of the driving signal, the driving signal of the driving signal 21) are detected
The oscillator signal of oscillator signal and the driving signal falling edge at rising edge.
Specifically, the failing edge of rising edge, the driving signal 22) based on the driving signal, the driving signal
The oscillator signal of oscillator signal and the driving signal falling edge at rising edge adjusts the amplitude of the equalizing signal, prolongs
When or pulse width.
More specifically, the equalizing signal Iequ is multiple pulse signals.It is described equal in the rising edge of the optical signal L0
Weighing apparatus signal Iequ is drop-down pulse；In the failing edge of the optical signal L0, the equalizing signal Iequ is pull-up pulse.Each pulse
Amplitude it is related with the oscillation amplitude of corresponding phase, the width of each pulse and the duration of oscillation of corresponding phase are related, specifically
Numerical value, which is subject to after each pulse is superimposed with the oscillator signal, offsets oscillation, will not repeat them here.Generally, oscillator signal
Amplitude is bigger, and the amplitude of pulse signal is bigger in the equalizing signal Iequ；The duration of oscillator signal is longer, the equilibrium
The pulse width of pulse signal is bigger in signal Iequ.
Specifically, meanwhile, 23) operating ambient temperature based on the laser source generating circuit 1 adjusts the equalizing signal
Amplitude, delay or pulse width.
More specifically, the influence due to temperature for different laser driven modules 11 is different, it can be driven for a laser
The driving signal that dynamic model block generates at different temperatures is tested, and establishes look-up table based on the test result, for lookup
Content in table obtains the compensation rate of driving signal under Current Temperatures.
It should be noted that generating the equalizing signal, Huo Zhegen according to the output signal of the laser driven module 11
Equalizing signal described in operating ambient temperature according to the laser source generating circuit, the two can be executed individually, not with this implementation
Example is limited.
3) oscillationg component in the driving signal is compensated based on the equalizing signal, to obtain stable driving signal.
Specifically, equalizing signal compensation is offset in the driving signal into the driving signal by complementation
Oscillationg component.
4) stable optical signal is exported based on the stable driving signal driving light emitting module.
Specifically, as shown in figure 5, optical signal L1 and the current signal Iin of the input signal Vin after compensated are basic
It is consistent, and there is no oscillation, stability is high.
Laser source generating circuit and equalization methods of the invention by being compensated to driving signal, thus offset PCB and
The non-ideal effects of laser itself, and the coefficient of balance module is dynamically adjusted according to the operating temperature of laser driven module,
It obtains stablizing output, and then generates the impulse modulation high power light signal of dead-beat.
In conclusion the present invention provides a kind of laser source generating circuit and equalization methods, comprising: laser driven module connects
Input signal is received, impulse modulation is carried out to the input signal, to obtain driving signal；Balance module is connected to the laser
The both ends of drive module, and the equalizing signal for compensating the laser driven module is generated according to the driving signal；Light emitting module,
The output end for connecting the laser driven module exports stable laser signal based on compensated driving signal.Based on input
The driving signal of signal generation laser source；Waveform based on the driving signal generates the balanced letter for compensating the driving signal
Number；And the oscillationg component in the driving signal is compensated based on the equalizing signal, to obtain stable driving signal；Based on institute
It states stable driving signal driving light emitting module and exports stable optical signal.Laser source generating circuit of the invention and equalization methods
According to output waveform of laser driven module when without balance module, the waveform and balance module for needing equalizing signal are determined
Each term coefficient so that balance module generates euqalizing current corresponding with output optical signal waveform in rising edge and failing edge, from
And offset the non-ideal effects of PCB and laser itself；Meanwhile the operating temperature by detecting laser driven module, dynamically
The coefficient for adjusting balance module, so that output waveform does not vary with temperature.So the present invention effectively overcome it is in the prior art
Various shortcoming and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (8)
1. a kind of laser source generating circuit, which is characterized in that the laser source generating circuit includes at least:
Laser driven module receives input signal, impulse modulation is carried out to the input signal, to obtain driving signal；
Balance module is connected to the both ends of the laser driven module, and is generated according to the driving signal and compensate the laser
The equalizing signal of drive module；
Light emitting module connects the output end of the laser driven module, and stable laser is exported based on compensated driving signal
Signal.
2. laser source generating circuit according to claim 1, it is characterised in that: the balance module includes phase-detection list
Member, amplitude detection unit and equalizing signal generate unit；
The phase detection unit receives the output signal of the laser driven module, for detecting the rising of the driving signal
Edge and failing edge；
The amplitude detection unit receives the output signal of the laser driven module, is rising for detecting the driving signal
The amplitude of the oscillator signal of edge and falling edge and duration；
The equalizing signal generates the output end that unit is connected to the phase detection unit and the amplitude detection unit, according to
The output signal of the phase detection unit and the amplitude detection unit is produced in the driving signal in rising edge and failing edge
Raw equalizing signal corresponding with the oscillator signal.
3. laser source generating circuit according to claim 1, it is characterised in that: the balance module is also connected with temperature inspection
Module is surveyed, the driving signal is compensated based on the temperature information that the temperature detecting module detects.
4. laser source generating circuit according to claim 1, it is characterised in that: the laser driven module is current-mode electricity
Line structure.
5. laser source generating circuit according to claim 1, it is characterised in that: the light emitting module includes light-emitting diodes
Pipe, the anode of the light emitting diode connect the output end of the laser driven module, cathode ground connection.
6. a kind of equalization methods of laser source generating circuit, which is characterized in that the equalization methods of the laser source generating circuit are extremely
Include: less
The driving signal of laser source is generated based on input signal；
Waveform based on the driving signal generates the equalizing signal for compensating the driving signal；
And the oscillationg component in the driving signal is compensated based on the equalizing signal, to obtain stable driving signal；
Stable optical signal is exported based on the stable driving signal driving light emitting module.
7. the equalization methods of laser source generating circuit according to claim 6, it is characterised in that: generate the equalizing signal
Method include:
Detect the rising edge of the driving signal, the failing edge of the driving signal, the oscillation at the driving signal rising edge
The oscillator signal of signal and the driving signal falling edge；
Oscillation at the failing edge of rising edge, the driving signal based on the driving signal, the driving signal rising edge
The oscillator signal of signal and the driving signal falling edge adjusts amplitude, delay or the pulse width of the equalizing signal.
8. the equalization methods of laser source generating circuit according to claim 6, it is characterised in that: the laser source generates electricity
The equalization methods on road further include: the operating ambient temperature based on the laser source generating circuit adjusts the width of the equalizing signal
Degree, delay or pulse width.
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| CN201811212894.5A CN109412012B (en) | 2018-10-18 | 2018-10-18 | Laser source generating circuit and equalizing method |
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|---|---|---|---|
| CN201811212894.5A CN109412012B (en) | 2018-10-18 | 2018-10-18 | Laser source generating circuit and equalizing method |
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| CN109412012B CN109412012B (en) | 2020-12-18 |
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| CN109412012B (en) | 2020-12-18 |
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