CN109788622A - Light source control device, light source control method and time-of-flight sensor - Google Patents
Light source control device, light source control method and time-of-flight sensor Download PDFInfo
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- CN109788622A CN109788622A CN201910201847.9A CN201910201847A CN109788622A CN 109788622 A CN109788622 A CN 109788622A CN 201910201847 A CN201910201847 A CN 201910201847A CN 109788622 A CN109788622 A CN 109788622A
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- 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
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- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The present invention relates to a kind of light source control device and its control method and a kind of time-of-flight sensor, the light source control device includes: current control module, for the control target according to glow current, exports corresponding control signal；Adjustable voltage source module is connect with the current control module, for exporting corresponding light source voltage according to the control signal of the current control module；Light source module is connect with the adjustable voltage source module, glow current is controlled by the light source voltage of adjustable voltage source module output, to issue the light of corresponding power.Above-mentioned light source control device advantageously reduces power consumption, improves system performance.
Description
Technical field
The present invention relates to field of sensing technologies more particularly to a kind of light source control devices, light source control method and flight
Timer.
Background technique
The pulse signal that time-of-flight method (Time Of Flight, TOF) is issued by measuring instrument from be emitted to receive
Time interval or the round-trip testee of laser once caused by phase realize three-dimensional structure or three-dimensional to testee
The measurement of profile.TOF measuring instrument can obtain gray level image and range image simultaneously, be widely used in motion sensing control, behavior point
The numerous areas such as analysis, monitoring, automatic Pilot, artificial intelligence, machine vision and automatic 3D modeling.
Flight time (TOF) sensor generally comprises: light source module and illuminant module；The light source module is for emitting spy
The pulse detection light of standing wave section and frequency, the detection light reflect on the surface of testee, and reflected light is by described photosensitive
Module is received；The illuminant module calculates tested according to the time difference or phasometer that emit between light wave and reception light wave
The range information of object.
The image effect that time-of-flight sensor obtains is influenced by testee reflection coefficient, when depositing simultaneously in image
In the object of high reflectance and low reflection coefficient, it is over-exposed to be easy to happen reflection coefficient object, and low reflection coefficient
Object then can be under-exposed problem, seriously affect graphical quality.Therefore, in the prior art, high dynamic (HDR) feelings are frequently encountered
Condition, can by adjusting the power of detection light, obtain multiple difference exposure pictures, then again be combined into one scheme
Piece finally obtains each object and exposes all suitable image；Or the optical power by adjusting detection light, guarantee high reflection system
The detection signal of overexposure and low reflection object body does not have certain signal-to-noise ratio to number object.
Therefore, for the quick of the power of the detection light of time-of-flight sensor and accurately adjusting is particularly important.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of light source control device, light source control method and flights
Timer improves performance to reduce the power consumption of light source control.
In order to solve described problem, the present invention provides a kind of light source control devices, comprising: current control module is used for
According to the control target of glow current, corresponding control signal is exported；Adjustable voltage source module connects with the current control module
It connects, for exporting corresponding light source voltage according to the control signal of the current control module；Light source module, with the adjustable electric
The connection of potential source module controls glow current size by the light source voltage of adjustable voltage source module output, to issue correspondence
The light of power.
Optionally, the current control module controls target and control flow, output according to preset glow current
Corresponding control signal.
Optionally, further includes: feedback module, the feedback module are connected to the current control module, are used for described
Current control module sends feedback signal relevant to light source module glow current；The current control module is used for according to
Feedback signal, adjustment glow current controls target, and exports corresponding control signal to adjustable voltage source module.
Optionally, the feedback module is used to detect the glow current of light source module, and is formed and the glow current pair
The feedback signal answered.
Optionally, the feedback module includes the converting unit of photodiode and the connection photodiode, described
Photodiode is used to receive the light that light source module issues with certain proportion, and is converted into feedback electricity corresponding with glow current
Stream；The converting unit is used to carry out analog-to-digital conversion to the feedback current, forms feedback signal.
Optionally, the light source control device is used for time-of-flight sensor, and the time-of-flight sensor includes image
Processing module, the feedback module is for being connected to described image processing module, according to the figure of described image processing module acquisition
As information, feedback signal is formed.
Optionally, the adjustable voltage source module is used to carry out boost or depressurization to operating voltage according to the control signal
Processing.
Optionally, the light source module includes luminescent device and driving unit, and the driving unit is for controlling the hair
The state that is turned on or off of optical device.
It optionally, further include a capacitor, one end ground connection, the other end is connected to the output end of adjustable voltage source module, described
Line internal resistance is R, the electricity of the voltage input end of the light source module between the output end of adjustable voltage source module and the capacitor
Pressure adjustment time is T, and the numerical value of T=2 π × RC, the capacitor C are determined by the voltage adjustment time.
Technical solution of the present invention also provides a kind of time-of-flight sensor, comprising: light source control described in any of the above embodiments
Device processed.
Technical solution of the present invention also provides a kind of light source control method, comprising: according to the control target of glow current, produces
Raw corresponding control signal；According to the control signal, corresponding light source voltage is formed；The electricity that shines is controlled by the light source voltage
Size is flowed, to issue the light of corresponding power.
Optionally, target and control flow are controlled according to preset glow current, generates corresponding control signal.
Optionally, further includes: form feedback signal relevant to glow current；According to the feedback signal, adjustment shines
The control target of electric current, and generate corresponding control signal.
Optionally, luminous glow current size is detected, and according to the glow current size, is formed and the luminous electricity
Flow relevant feedback signal.
Optionally, it uses photodiode to receive the light that light source module issues with certain proportion, and is converted into and the electricity that shines
Flow corresponding feedback current；Analog-to-digital conversion is carried out to the feedback current, forms feedback signal.
Optionally, when the light source control method is used for the light source control of time-of-flight sensor, when according to the flight
Between sensor obtain image information, formed feedback signal.
Optionally, according to the control signal, boost or depressurization processing is carried out to operating voltage, to form corresponding light source
Voltage.
Light source control device of the invention adjusts light source module by a current control module and adjustable voltage source module
Light source voltage makes it that it can be made to meet the needs of laser safety and make imaging to realize the adjustment to luminous power
High dynamic (HDR) effect reaches best.The process control to light source voltage may be implemented by the current control module, and
And the glow current information that can be combined with light source module last moment carries out dynamic adjustment, so that the light source as feedback
The luminous power adjustment of module is more intelligent.And it is possible to reduce the element pressure drop inside light source module, fever is reduced, is reduced
Power consumption improves system stability.Applied to time-of-flight sensor, be conducive to the ranging accuracy for improving time-of-flight sensor
And imaging effect, improve user experience.
Detailed description of the invention
Fig. 1 is the flow diagram of the light source control method of the embodiment of the invention；
Fig. 2 to Fig. 5 is the structural schematic diagram of the light source control device of the specific embodiment of the invention.
Specific embodiment
In the prior art to the adjustment of light source power usually by adjusting the MOS with the light emitting elements in series in light source module
The conducting resistance of transistor or other elements, to adjust the glow current of light-emitting component, to realize to the light-emitting component
The adjustment of luminous power.In the case where light source module operating voltage is certain, the pressure drop of light-emitting component is limited, when electric current becomes smaller,
Biggish pressure drop can be generated in sensor chip other elements, to generate great heat, influence system performance and user
Experience.
A specific embodiment of the invention provides a kind of mode of adjustment light source voltage to adjust the luminous function of light source
Rate.
A specific embodiment of the invention also provides a kind of light source control method.
Referring to FIG. 1, the flow diagram of the light source control method for the embodiment of the invention.
The light source control method includes step S1~S3.
Step S1: according to the control target of glow current, corresponding control signal is generated.
The control signal can be digital logic signal or analog signal, in a specific embodiment, the control
Signal processed is for controlling a variable voltage source, so that the adjustable voltage source module output voltage changes, so as to adjust light
Source voltage.
Target and control flow, Xiang Suoshu adjustable voltage source module 102 can be controlled according to preset glow current
The corresponding control signal of output.
Can also glow current be adjusted and control target, and export corresponding control signal, the feedback based on the feedback signal
Signal is related to the glow current that last moment shines.Specifically, glow current size that can be luminous by detection, and according to
The glow current size forms feedback signal relevant to the glow current.For example, using photodiode centainly to compare
Example receives the light that light source module issues, and is converted into feedback current corresponding with glow current；Mould is carried out to the feedback current
Number conversion, forms feedback signal.It, can be with root when the light source control method is used for the light source control of time-of-flight sensor
According to the image information that the time-of-flight sensor obtains, feedback signal is formed.
Step S2: according to the control signal, corresponding light source voltage is formed.
Under the control signal function, internal resistance value or other parameters adjust variable voltage source, so that output electricity
Pressure changes, so as to adjust light source voltage.In a specific embodiment, the adjustable voltage source module is connected to work
Voltage VDD can carry out boost or depressurization processing to the operating voltage VDD, export suitable light source voltage VL.By to institute
Adjustable voltage source module input control signal is stated, boost or depressurization of the adjustable voltage source module to operating voltage VDD is controlled
Ratio, so as to adjust the light source voltage VL size of adjustable voltage source module output.The adjustable voltage source module can be
DC-DC converter, LDO linear voltage regulator and digital potentiometer etc..
Step S3: glow current size is controlled by the light source voltage, to issue the light of corresponding power.
Luminous, the sun of the luminescent device can be carried out using photodiode or the luminescent device comprising photodiode
Pole connects light source voltage, and in the case where luminescent device conducting, the light source voltage is bigger, and glow current is bigger.It is described to shine
Device can be driven by a driving unit with switch element, and the switch element is connected to the luminescent device
Cathode and ground terminal between, by controlling the on off operating mode of the switch element, control the luminescent device leads on-off
Open state.
The above method adjusts luminous power by adjusting light source voltage, it is possible to reduce the pressure drop of element in circuit is reduced
Fever reduces power consumption, improves system performance.
A specific embodiment of the invention also provides a kind of light source control device for realizing above-mentioned light source control method,
Above-mentioned light source control method is further described below in conjunction with the light source control device.
Referring to FIG. 2, the structural schematic diagram of the light source control device for the embodiment of the invention.
The light source control device includes: current control module 101, adjustable voltage source module 102 and light source module
103, the adjustable voltage source module 102 connects the output end of the current control module 101, and the light source module 103 is used for
Connect the voltage output end of the adjustable voltage source module 102.
The current control module 101 is used for the control target according to glow current, exports corresponding control signal.It is described
Adjustable voltage source module 102 is connect with the current control module 101, for the control according to the current control module 101
Signal exports corresponding light source voltage.Light source module 103 is connect, by the adjustable voltage with the adjustable voltage source module 102
The light source voltage of source module output controls glow current, to issue the light of corresponding power.
The current control module 101 for exporting digital logic control signals, to the adjustable voltage source module 102 into
Row control, by controlling the inside resistance value or other parameters of the adjustable voltage source module 102, so that the variable voltage source mould
102 output voltage of block changes, so as to adjust light source voltage.
The adjustable voltage source module 102 is connected to operating voltage VDD, can be to the operating voltage VDDCarry out boosting or
Decompression processing, exports suitable light source voltage VL.The current control module 101 is by the adjustable voltage source module 102
Input control signal controls the adjustable voltage source module 102 to operating voltage VDDBoost or depressurization ratio, so as to adjust institute
State the light source voltage V of the output of adjustable voltage source module 102LSize.
The adjustable voltage source module 102 can be DC-DC converter, LDO linear voltage regulator and digital potentiometer etc..
In a specific embodiment, the adjustable voltage source module 102 is digital potentiometer, and the digital potentiometer includes vernier
Resistance controls the resistance value of the vernier resistance by logic digital controlled signal, it will be able to adjust the adjustable voltage source module
The voltage swing of 102 outputs.
The light source module 103 includes luminescent device D1 and driving unit 1031, and the driving unit 1031 is for controlling
The state that is turned on or off of the luminescent device D1.In a specific embodiment, the luminescent device D1 is two pole of photoelectricity
Pipe, in other specific embodiments, the luminescent device D1 is the luminescent device comprising photodiode cell, such as LED
The electric current of diode, laser diode or VCSEL laser etc., the luminescent device D1 is bigger, and the luminescent device D1 is issued
Light intensity it is bigger, optical power is bigger.The driving unit 1031 includes a switch element M1, is connected to the luminescent device D1's
Between cathode and ground terminal, a voltage or current source S1 are connected to the control terminal of the switch element M1 by a buffer B1,
For controlling the on off operating mode of the switch element M1, to control the state that is turned on or off of the luminescent device D1.It is described
Whether luminescent device D1 shines is controlled by the driving unit 1031, and the glow current of the luminescent device D1 is shone by described
The light source voltage V that device D1 anode is inputtedLIt determines.The luminous power of light source module 103 passes through light source voltage VLIt is adjusted,
It not will lead to the increase of 103 internal pressure drops of light source module, so as to reduce the heat of the generation of light source module 103, improve systematicness
Energy.
In the specific embodiment, the light emitting module 103 further includes a capacitor C1, and the one end the capacitor C1 is grounded, separately
One end is connected to the output end of the adjustable voltage source module 102, defeated for stablizing the i.e. voltage of 103 anode tap of light source module
Enter the light source voltage V at endL, avoid light source voltage VLQuickly variation occurs.Since the capacitive reactance of the capacitor C1 acts on, adjustable voltage
When the output end voltage of source module 102 changes, a period of time, the light source voltage of 103 anode tap of light emitting module are needed
VLIt could be consistent with the output end voltage of adjustable voltage source module 102.The output end of the adjustable voltage source module 102 with it is described
Line internal resistance is r between capacitor C1, and the single voltage adjustment time of the voltage input end of the light source module 103 is T, T=τ=
2π×rC.Since the resistance value of the internal resistance r is determined by route, it is difficult to be adjusted, it therefore, can be by adjusting the capacitor C1
Value, come adjust light source module 103 voltage input end voltage adjustment time T.In a specific embodiment, the light
Source control device is used for time-of-flight sensor, and voltage adjustment time T is shorter, therefore there are certain requirements to regulating the speed.Such as
Voltage adjustment time is the frame per second that T is less than that time-of-flight sensor obtains image.In a specific embodiment, the flight
The time that timer obtains a frame image is 33ms, and wherein the time for exposure is 20ms, and remaining 13ms is for preparing next time
Light source voltage VL required for exposing, then T < 13ms.It can be according in the requirement of single voltage adjustment time T and circuit
R is hindered, to select suitable capacitor C1, so that the light source voltage V of the voltage input end of the light source module 103LAdjustment speed
Rate can satisfy requirement.
In a specific embodiment, the current control module 101 is used for according to preset glow current control
Target processed and control flow, Xiang Suoshu adjustable voltage source module 102 export corresponding control signal.For example, the light source control
Device is used for time-of-flight sensor, controls according to preset method.For example expose in three times, optical power is detected every time
Be followed successively by it is small, in, greatly, a more perfect high dynamic is then synthesized according to the confidence level of the distance parameter of each pixel
(HDR) figure.Current control module 101 controls target according to preset glow current, i.e. I1 > I2 > I3 exports corresponding control
Signal processed, the control signal is digital signal, for controlling adjustable voltage source module 102, is sequentially output it pair
Light source voltage V1, V2 and the V3 answered, and V1 > V2 > V3 so that the exposure glow current of the light source module 103 be followed successively by I1, I2,
I3 realizes the control to light source luminescent power.
Referring to FIG. 3, the current control module 101 is for based on the feedback signal, adjusting in another specific embodiment
It haircuts photoelectricity flow control target, and exports corresponding control signal to adjustable voltage source module.The feedback signal and light source die
The glow current that 103 last moment of block shines is related.The current control module 101 can before mould group or product export,
Carry out preceding calibration of dispatching from the factory by specific feedback model, to obtain accurate feedback factor, eliminate circuit block mismatch and
Non-ideal factor.
In the specific embodiment, the light source control device further includes feedback module 201, and the feedback module 201 connects
It is connected to the current control module 101, for sending and 103 glow current phase of light source module to the current control module 101
The feedback signal of pass；The current control module 101 is used to adjust glow current according to the feedback signal and control target, and
Corresponding control signal is exported to adjustable voltage source module 102.The feedback module 201 can have with the light source module 103
There is circuit connection, or obtains the feedback information of light source module 103 by other means.
In this specific embodiment, the feedback module 201 is connected to the luminescent device D1 institute of the light source module 103
In circuit, for detecting the glow current of light source module 103, and feedback signal corresponding with the glow current is formed.For example,
The feedback module 201 may include detection unit, for detecting the glow current of the luminescent device D1, and feed back to electric current
Control module 101, the current control module 101 according to a pre-set procedure, send correspond to according to the digital signal
Control signal to adjustable voltage source module 102.The feedback signal can be analog signal, or after conversion
Digital signal.For example, when the glow current feedback signal of the luminescent device D1 is greater than a setting value, the current control mould
Block 101 sends voltage down control signals to adjustable voltage module 102, to reduce the light source voltage of the light source module 103.Alternatively,
The current control module 101 is built-in with logical program, based on the feedback signal, in conjunction with required picture quality and eye-safe mark
The factors such as standard obtain corresponding control signal with internal logic operation.
Referring to FIG. 4, the structural schematic diagram of the light source control device for the embodiment of the invention.
The feedback module 201 of the light source control device includes photodiode D2 and turn for connecting the photodiode D2
Unit 2011 is changed, the photodiode D2 is used to receive the light that light source module 103 issues with certain proportion, and is converted into and sends out
The corresponding feedback current of photoelectric current；The converting unit 2011 is used to carry out analog-to-digital conversion to the feedback current, forms feedback
Signal.The light intensity that the light source module 103 issues is bigger, and the feedback current that the photodiode D2 is generated is bigger, described anti-
Supply current is directly proportional to the glow current of light source module 103, and therefore, the feedback signal is and the glow current size phase
It closes.
A specific embodiment of the invention also provides a kind of time-of-flight sensor including the light source control device.
Referring to FIG. 5, being the time-of-flight sensor structural schematic diagram of the embodiment of the invention.
The time-of-flight sensor includes above-mentioned light source control device, the adjustable voltage source module 102, current control
The driving unit of any one or two of module 101 and the light source module 103 can integrate and pass in the flight time
On the driving chip of sensor.In other specific embodiments, the adjustable voltage source module 102 and/or current control module
101 can also individually be integrated on independent chip.
The time-of-flight sensor further includes image processing module 301, as the specific embodiment of the present invention,
The feedback module 201 of the light source control device is connected to described image processing module 301, for handling mould according to described image
The image information that block 301 obtains forms feedback signal.Each pixel that the feedback signal and described image processing module obtain
Light energy is related, and the light energy of each pixel is related to the glow current of light source module 103, and glow current is bigger, and each pixel obtains
The light energy value obtained is bigger.The feedback signal can be the corresponding digital or analog signal of the light energy value.Alternatively, described
Feedback signal may include the light energy of each pixel and the confidence information of range information, for example, when the distance of pixel acquisition
The decline of information confidence level, the current control module 101 can control the light that adjustable voltage source module 102 increases or decreases output
Source voltage VL, to improve the accuracy of the sensor distance detection.The feedback signal can also handle mould with described image
The reflectivity for the testee that block 301 obtains is related, such as the reflectivity of black object is lower, so that the luminous energy that each pixel obtains
Amount is smaller, needs to increase luminous intensity；And the reflectivity of white object is higher, so that the light energy that each pixel obtains is larger, needs
Reduce luminous intensity.
Light source control device of the invention adjusts light source module by a current control module and adjustable voltage source module
Light source voltage, to realize the adjustment to luminous power.The program to light source voltage may be implemented by the current control module
Control, also, the glow current information that can be combined with light source module last moment carries out dynamic adjustment as feedback, so that
The luminous power adjustment of the light source module is more intelligent.And it is possible to reduce the element pressure drop inside light source module, hair is reduced
Heat reduces power consumption, improves system stability.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (17)
1. a kind of light source control device characterized by comprising
Current control module exports corresponding control signal for the control target according to glow current；
Adjustable voltage source module is connect with the current control module, for the control signal according to the current control module
Export corresponding light source voltage；
Light source module is connect with the adjustable voltage source module, is controlled by the light source voltage of adjustable voltage source module output
Glow current size, to issue the light of corresponding power.
2. light source control device according to claim 1, which is characterized in that the current control module is according to presetting
Glow current control target and control flow, export corresponding control signal.
3. light source control device according to claim 1, which is characterized in that further include: feedback module, the feedback module
It is connected to the current control module, for sending feedback relevant to light source module glow current to the current control module
Signal；The current control module is used to adjust glow current according to the feedback signal and control target, and export corresponding control
Signal processed is to adjustable voltage source module.
4. light source control device according to claim 3, which is characterized in that the feedback module is for detecting light source module
Glow current, and form corresponding with glow current feedback signal.
5. light source control device according to claim 4, which is characterized in that the feedback module include photodiode and
The converting unit of the photodiode is connected, the photodiode is used to receive what light source module issued with certain proportion
Light, and it is converted into feedback current corresponding with glow current；The converting unit is used to carry out modulus to the feedback current to turn
It changes, forms feedback signal.
6. light source control device according to claim 3, which is characterized in that the light source control device is used for the flight time
Sensor, the time-of-flight sensor include image processing module, and the feedback module is for being connected to described image processing
Module forms feedback signal according to the image information that described image processing module obtains.
7. light source control device according to claim 1, which is characterized in that the adjustable voltage source module is used for according to institute
It states control signal and boost or depressurization processing is carried out to operating voltage.
8. light source control device according to claim 1, which is characterized in that the light source module includes luminescent device and drive
Moving cell, the driving unit are used to control the state that is turned on or off of the luminescent device.
9. light source control device according to claim 1, which is characterized in that further include a capacitor, one end ground connection, the other end
It is connected to the output end of adjustable voltage source module, line internal resistance between the output end and the capacitor of the adjustable voltage source module
Voltage adjustment time for R, the voltage input end of the light source module is T, and T=2 π × RC, the numerical value of the capacitor C is by described
Voltage adjustment time determines.
10. a kind of time-of-flight sensor characterized by comprising light source control as claimed in any one of claims 1-9 wherein
Device processed.
11. a kind of light source control method characterized by comprising
According to the control target of glow current, corresponding control signal is generated；
According to the control signal, corresponding light source voltage is formed；
Glow current size is controlled by the light source voltage, to issue the light of corresponding power.
12. light source control method according to claim 11, which is characterized in that controlled according to preset glow current
Target and control flow generate corresponding control signal.
13. light source control method according to claim 11, which is characterized in that further include: it is formed related to glow current
Feedback signal；According to the feedback signal, the control target of glow current is adjusted, and generates corresponding control signal.
14. light source control method according to claim 13, which is characterized in that luminous glow current size is detected, and
According to the glow current size, feedback signal relevant to the glow current is formed.
15. 4 light source control method stated according to claim 1, which is characterized in that photodiode is used to receive with certain proportion
The light that light source module issues, and it is converted into feedback current corresponding with glow current；Analog-to-digital conversion is carried out to the feedback current,
Form feedback signal.
16. light source control method according to claim 13, which is characterized in that when the light source control method is used for flight
Between sensor light source control when, according to the time-of-flight sensor obtain image information, formed feedback signal.
17. light source control method according to claim 11, which is characterized in that according to the control signal, to work electricity
Pressure carries out boost or depressurization processing, to form corresponding light source voltage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110231611A (en) * | 2019-06-14 | 2019-09-13 | 炬佑智能科技(苏州)有限公司 | TOF sensor and its distance detection method |
| CN110456380A (en) * | 2019-07-31 | 2019-11-15 | 炬佑智能科技(苏州)有限公司 | Flight time sensing cameras and its depth detection method |
| CN113252139A (en) * | 2021-06-28 | 2021-08-13 | 北京锐达仪表有限公司 | Guided wave radar level meter for adjusting transmitted signal waveform |
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| CN115937922B (en) * | 2021-08-11 | 2023-11-07 | 荣耀终端有限公司 | Face recognition method and device |
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