CN110488245A - A kind of the photophore automatic power control method and system of pulsewidth modulation - Google Patents
A kind of the photophore automatic power control method and system of pulsewidth modulation Download PDFInfo
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- CN110488245A CN110488245A CN201910696195.0A CN201910696195A CN110488245A CN 110488245 A CN110488245 A CN 110488245A CN 201910696195 A CN201910696195 A CN 201910696195A CN 110488245 A CN110488245 A CN 110488245A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000003760 hair shine Effects 0.000 claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000011897 real-time detection Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims 2
- 230000008859 change Effects 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 210000001367 artery Anatomy 0.000 description 4
- 210000003462 vein Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000686 essence Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4238—Pulsed light
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The present invention proposes the photophore automatic power control method and system of a kind of pulsewidth modulation.This method comprises: the default pulsewidth for the drive input signal that shines is arranged by pulse width modulation module；The luminous drive input signal is transferred to luminous drive module；The output signal driving light emitting module of the luminous drive module shines；The pulse width modulation module detection light emitting module luminous time, when the luminous time reaching default pulsewidth, the drive module that shines driving light emitting module stops shining.The present invention uses pulse width modulation module, pulse-width regulated is carried out to the input signal for being input to luminous drive module, so that the pulsewidth of the output signal for the drive module that shines no longer is determined by the pulsewidth of input signal, it can not only distortion of the external environment of effective compensation (such as temperature) to optical drive signal, automated power control can also be realized in the case where not changing photophore electric current, change the influence to range accuracy so as to avoid power.
Description
Technical field
The present invention relates to photophore technical fields, and in particular to a kind of photophore automatic power control method of pulsewidth modulation
And system.
Background technique
It is increasing for the demand of the precision distance measurement of short-distance and medium-distance in recent years, including recognition of face, 3D modeling, peace
Under the automatic Pilot of anti-monitoring, even unmanned aerial vehicle or automobile etc. application scenarios, require to use high-speed, high precision away from
From measurement.The ranging scheme of mainstream is as shown in Figure 1, be mostly to shine to get on barrier and receive by active to be reflected back at present
The light beam come is compared by certain characteristics to transmitting light and reflected light, such as the time difference, the information such as phase difference, thus
Conversion obtains range information.Additionally by continuing high speed accurately detecting range information, moreover it is possible to realize the identification to detection target, with
Track, the artificial intelligentized operation such as speed monitoring even motion track anticipation.
As anallatic civilian demand is more and more wider, the output power of photophore becomes higher and higher, application environment
Also increasingly harsher, therefore the requirement to the anti-interference of photophore and to eye-safe also becomes higher and higher.It is more and more
Scheme in attempt use automated power control.Existing power control is usually to adjust the size of current of driving photophore.But
Due to photophore itself and luminous driving chip the response speed of different size of current is difficult to accomplish it is completely the same, and it is this
It is inconsistent to also result in luminous driving chip and all meet the requirement of range accuracy in all power gears, thus need to rectify
Just, and mould group correction need time cost it is very high.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of photophore automatic power control method energy of pulsewidth modulation
Distortion of the external environment to optical drive signal is compensated, realizes automated power control in the case where not changing photophore electric current, from
And influence of the power change to range accuracy is avoided, improve measurement accuracy.
To solve the above-mentioned problems, the present invention provides a kind of photophore automatic power control method of pulsewidth modulation, institutes
State method comprising steps of
The default pulsewidth for the drive input signal that shines is set by pulse width modulation module；
The luminous drive input signal is transferred to luminous drive module；
The output signal driving light emitting module of the luminous drive module shines；
The pulse width modulation module detection light emitting module luminous time, when the luminous time reaching default pulsewidth, hair
Optical drive module drive light emitting module stops shining.
Preferably, the method also includes steps:
The output signal for the drive module that shines described in the pulse width modulation module real-time detection, so that the luminous driving letter
Number output signal pulsewidth be equal to the pulse width modulation module setting default pulsewidth.
Preferably, the method also includes:
Judge whether the Output optical power of light emitting module is greater than preset value, if so, adjusting arteries and veins by pulse width modulation module
It is wide.
Preferably, it is generated at the beginning of the pulsewidth by the voltage or current that clock system generates.
Preferably, the clock system includes phaselocked loop or delay locked loop.
The present invention also provides a kind of photophore automatic power control system of pulsewidth modulation, the system comprises:
Pulse width modulation module, for the default pulsewidth of luminous drive input signal to be arranged；
Shine drive module, receives the luminous drive input signal；
The output signal of light emitting module, the luminous drive module drives the light emitting module to shine；
The pulse width modulation module detection light emitting module luminous time, when the luminous time reaching default pulsewidth, hair
Optical drive module drive light emitting module stops shining
Preferably, the system also includes:
Light intensity detection module, for judging whether the Output optical power of light emitting module is greater than preset value, if so, passing through arteries and veins
Wide modulation module adjusting pulsewidth
Preferably, the system also includes clock system, the voltage that is generated at the beginning of the pulsewidth by clock system
Or electric current generates.
Scheme in compared with the existing technology, advantages of the present invention:
The photophore automatic power control method and system for a kind of pulsewidth modulation that the embodiment of the present invention proposes, using pulsewidth
Modulation module carries out pulse-width regulated to the input signal for being input to luminous drive module, so that the output letter for the drive module that shines
Number pulsewidth no longer determined by the pulsewidth of input signal, can not only the external environment of effective compensation (such as temperature) to optical drive signal
Distortion, moreover it is possible to realize automated power control in the case where not changing photophore electric current, so as to avoid power change to survey
Influence away from precision.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 show a kind of flow diagram of the photophore automatic power control method of pulsewidth modulation of the present invention.
Fig. 2 show the working timing figure of pulse width modulation module.
Fig. 3 show a kind of schematic diagram of the photophore automatic power control system of pulsewidth modulation.
Specific embodiment
Above scheme is described further below in conjunction with specific embodiment.It should be understood that these embodiments are for illustrating
The present invention and be not limited to limit the scope of the invention.Implementation condition used in the examples can be done such as the condition of specific producer into
One successive step, the implementation condition being not specified are usually the condition in routine experiment.
It please refers to Fig. 1 and show a kind of process of photophore automatic power control method based on pulsewidth modulation of the present invention and show
It is intended to, described method includes following steps:
Step S1: the default pulsewidth for the drive input signal that shines is set by pulse width modulation module；The pulsewidth modulation mould
Multiple desired pulsewidths, i.e. pulse width are pre-set in block.User can pass through one default pulsewidth of digital control selection
I.e. initial pulsewidth.
Step S2: the luminous drive input signal is transferred to luminous drive module；
Step S3: the output signal driving light emitting module of the luminous drive module shines；
Step S4: the pulse width modulation module detection light emitting module luminous time, reach default arteries and veins when the luminous time
When wide, the drive module that shines driving light emitting module stops shining.In the present invention, when luminous drive module outputs level signals drive
When light emitting module starts to shine, pulse modulation module starts to detect the light emitting module luminous time, when light emitting module shines
Between when reaching preset pulse width, the drive module that shines driving light emitting module stops shining.
The output signal for the drive module that shines in the present invention, described in the pulse width modulation module real-time detection, described in adjusting
Signal makes the pulsewidth of the output signal of the luminous driving signal be equal to the default pulsewidth that the pulse width modulation module is arranged, when
When the modulation window of pulse width modulation module is opened, luminous drive module starts light emitting module is driven to carry out luminous.When modulation window
When closing, the output for the drive module that shines is pulled low i.e. output low level signal, stops driving light emitting module at once.Modulate window
Width determined completely by the default pulsewidth of the module.It so can ensure that the high level signal of the output of luminous drive module
Time started, which can accurately follow, modulates the time that window is opened in pulse width modulation module.
Please refer to the working timing figure that Fig. 2 show pulse width modulation module.In the present invention, the output letter for the drive module that shines
It number is that high level or low level are controlled by pulse width modulation module completely.When drive input signal is high level, arteries and veins is triggered
The pulsewidth modulation window of wide modulation module is opened, and the drive module that shines exports high level, and driving light emitting module starts to shine.This hair
The time T1 that bright middle impulse modulation window is opened is fixed and invariable.Once the time T1 that pulsewidth modulation window is opened reaches solid
After fixing time, control modulation close, the drive module that shines exports low level, and light emitting module stops shining.
The invention also includes following steps:
The invention also includes light intensity detection modules, for judging whether the Output optical power of light emitting module is greater than preset value,
If so, passing through pulse width modulation module adjusting pulsewidth.In the present invention, the light of light emitting module output is detected by light intensity detection module
The size of power, when the optical power of light emitting module output is greater than preset value, i.e., if optical power is excessive, light intensity has been more than mark
Standard when not meeting eye-safe, notifies pulse width modulation module, the width of pulse width modulation module control pulse to subtract by digital engine
It is small, it is preferred that pulse width modulation module controls pulsewidth and reduces a gear, i.e. pulse width modulation module controls the time tune that light source starts
A small gear, such as the width of original pulse are set as n*T0, turn to change after a gear being set as (n-1) * T0 down.
In the present invention, the output state of the luminous drive module of pulse width modulation module real-time detection, it is ensured that shine drive module
Output high level signal at the beginning of can accurately follow in pulse width modulation module modulate window open time.
In the present invention, time T1 that the width of the pulsewidth, that is, impulse modulation window is opened can by phaselocked loop (PLL) or
The conventional delay unit electricity of voltage (or electric current) driving that delay locked loop (DLL) or any High Accuracy Clock generate
Road is realized.The delay unit of voltage (electric current) driving generated by this class clock system has very high anti-noise ability, can be with
Influence of the factors such as effective attenuation supply voltage or temperature to delay time.And select delay time with can be convenient.
Matching degree between different delayed time is also fine.
The present invention can also very easily realize that automatic Output optical power controls using pulse width modulation module.Optical power
Size depend on driving current and circuit duration length.The prior art is due to semiconductor devices and first device that shines
The limitation of part self character, the speed of the photoresponse of photophore is difficult to accomplish consistent under different driving electric current.And present invention benefit
It can be then accurately controlled very much the electric current opening time with the pulse width modulation module that clock system controls, therefore drive can not changed
Change output power in the case where streaming current and luminescence response speed.
The present invention also provides a kind of photophore automatic power control systems of pulsewidth modulation, please refer to Fig. 3 and show one kind
The schematic diagram of the photophore automatic power control system of pulsewidth modulation.The system comprises pulse width modulation modules 10, and shine driving
Module 20 and light emitting module 30, the pulse width modulation module 10 is used to be arranged the default pulsewidth of luminous drive input signal, described
The drive module 20 that shines is for receiving the luminous drive input signal, the output signal driving of the luminous drive module 20
The light emitting module 30 shines；The pulse width modulation module 10 detects the luminous time of light emitting module 30, reaches when the luminous time
When to default pulsewidth, the drive module 20 that shines drives light emitting module to stop shining.
The invention also includes light intensity detection modules 40, for judging it is default whether the Output optical power of light emitting module 30 is greater than
Value, if so, passing through 10 adjusting pulsewidth of pulse width modulation module.In the present invention, light emitting module is detected by light intensity detection module 40
The size of the optical power of 30 outputs, when the optical power that light emitting module 30 exports is greater than preset value, i.e., if optical power is excessive, light
It has been more than by force standard, when not meeting eye-safe, has notified pulse width modulation module 10, pulse width modulation module 10 to control by digital engine
The width of pulse processed reduces, it is preferred that pulse width modulation module 10 controls pulsewidth and reduces a gear, i.e. pulse width modulation module 10 is controlled
The time that light source processed starts turns a gear down.Such as original pulse width is set as n*T0, turns to change after a gear setting down now
For (n-1) * T0.
In the present invention, time T1 that the width of the pulsewidth, that is, impulse modulation window is opened can by phaselocked loop (PLL) or
The conventional delay unit electricity of voltage (or electric current) driving that delay locked loop (DLL) or any High Accuracy Clock generate
Road is realized.The delay unit of voltage (electric current) driving generated by this class clock system has very high anti-noise ability, can be with
Influence of the factors such as effective attenuation supply voltage or temperature to delay time.And select delay time with can be convenient.
Matching degree between different delayed time is also fine.
The photophore autocontrol method and system of pulsewidth modulation of the present invention, are compensated by pulsewidth automatic control
The distortion of the output signal for the drive module that shines, and can judge whether to meet eye-safe by light intensity detection module, if
Light intensity has been more than standard, very accurate can also easily adjust fluorescent lifetime, achieve the purpose that output power automatically controls.In
Under existing process conditions, the hard-wired difficulty of this method and expense all very littles, to piece outside non-ideal factor and temperature
Variation is also all insensitive, ensures that the consistency and safety of the output light source under different temperatures difference parasitic conditions.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
It is to can understand the content of the present invention and implement it accordingly, it is not intended to limit the scope of the present invention.All such as present invention essences
The equivalent transformation or modification that refreshing essence is done, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of photophore automatic power control method of pulsewidth modulation, which is characterized in that the method includes the steps:
The default pulsewidth for the drive input signal that shines is set by pulse width modulation module；
The luminous drive input signal is transferred to luminous drive module；
The output signal driving light emitting module of the luminous drive module shines；
The pulse width modulation module detection light emitting module luminous time shines and drives when the luminous time reaching default pulsewidth
Dynamic module drive light emitting module stops shining.
2. the photophore automatic power control method of pulsewidth modulation as described in claim 1, which is characterized in that the method is also
Comprising steps of
The output signal for the drive module that shines described in the pulse width modulation module real-time detection, so that the luminous driving signal
The pulsewidth of output signal is equal to the default pulsewidth of pulse width modulation module setting.
3. the photophore automatic power control method of pulsewidth modulation as described in claim 1, which is characterized in that the method is also
Include:
Judge whether the Output optical power of light emitting module is greater than preset value, if so, passing through pulse width modulation module adjusting pulsewidth.
4. the photophore automatic power control method of pulsewidth modulation as claimed in claim 2, which is characterized in that the pulsewidth
Time started is generated by the voltage or current that clock system generates.
5. the photophore automatic power control method of pulsewidth modulation as claimed in claim 4, which is characterized in that the clock system
System includes phaselocked loop or delay locked loop.
6. a kind of photophore automatic power control system of pulsewidth modulation, which is characterized in that the system comprises:
Pulse width modulation module, for the default pulsewidth of luminous drive input signal to be arranged；
Shine drive module, receives the luminous drive input signal；
The output signal of light emitting module, the luminous drive module drives the light emitting module to shine；
The pulse width modulation module detection light emitting module luminous time shines and drives when the luminous time reaching default pulsewidth
Dynamic module drive light emitting module stops shining.
7. the photophore automatic power control system of pulsewidth modulation as claimed in claim 6, which is characterized in that the pulsewidth tune
The output signal for the drive module that shines described in molding block real-time detection, so that the pulsewidth of the output signal of the luminous driving signal
Equal to the default pulsewidth of pulse width modulation module setting.
8. the photophore automatic power control system of pulsewidth modulation as claimed in claim 6, which is characterized in that the system is also
Include:
Light intensity detection module, for judging whether the Output optical power of light emitting module is greater than preset value, if so, passing through pulsewidth tune
Molding block adjusting pulsewidth.
9. the photophore automatic power control system of pulsewidth modulation as claimed in claim 7, which is characterized in that the system is also
Including clock system, generated at the beginning of the pulsewidth by the voltage or current that clock system generates.
10. the photophore automatic power control system of pulsewidth modulation as claimed in claim 9, which is characterized in that the clock
System includes phaselocked loop or delay locked loop.
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| CN201910696195.0A CN110488245A (en) | 2019-07-30 | 2019-07-30 | A kind of the photophore automatic power control method and system of pulsewidth modulation |
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| CN201910696195.0A CN110488245A (en) | 2019-07-30 | 2019-07-30 | A kind of the photophore automatic power control method and system of pulsewidth modulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332213A (en) * | 2021-01-04 | 2021-02-05 | 南京芯视界微电子科技有限公司 | Laser driving circuit with human eye protection function and method thereof |
| CN112448699A (en) * | 2019-08-29 | 2021-03-05 | 炬佑智能科技(苏州)有限公司 | Quick-response pulse width compensation circuit and method |
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Application publication date: 20191122 |