CN109257848A - Light source driving circuit, light source driving method and flight time distance measuring sensor - Google Patents
Light source driving circuit, light source driving method and flight time distance measuring sensor Download PDFInfo
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- CN109257848A CN109257848A CN201811227989.4A CN201811227989A CN109257848A CN 109257848 A CN109257848 A CN 109257848A CN 201811227989 A CN201811227989 A CN 201811227989A CN 109257848 A CN109257848 A CN 109257848A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- 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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
-
- 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
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The present invention relates to a kind of light source driving circuit, light source driving method and flight time distance measuring sensor, the light source driving circuit includes: light source, and the anode of the light source is connected to power end；First switch circuit, the anode of the first switch circuit are connected to the cathode of the light source, and the cathode of the first switch circuit connects low potential point, for controlling the on off operating mode between the cathode of the light source and low potential point；Second switch circuit, the second switch circuit on one side are connected to the anode of the light source, and the other end is connected to the cathode of the first switch circuit, for controlling the on off operating mode between the power end and low potential point.The light source driving circuit can reduce the influence of circuit parasitic inductance.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of light source driving circuits, light source driving method and flight
Time distance measuring sensor.
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 ranging (TOF) sensor generally comprises: light source module and illuminant module；The light source module is for sending out
The light wave of specific band and frequency is penetrated, the light wave reflects on the surface of testee, and reflected light is by the illuminant module
It is received；The illuminant module is according to transmitting light wave and receives the time difference between light wave or phasometer calculating testee
Depth information.
Luminescence unit of light source module typically LED light source or laser light source etc..The luminescent properties pair of light source module
There is large effect in the sensing capabilities of TOF sensor.Light source module issue detection light be pulsed light, the rising of pulsed light or
Failing edge is more precipitous, more advantageously forms the pulse of ultra-narrow, and the sensing capabilities of sensor are better.
But in the prior art, due to that can have every parasitic parameter, especially parasitic inductance in circuit, for electric current
Change thoughts antiatherosclerotic effect, so that the porch of light source the variations such as rises or falls and can generate delay, even non-ideal mistake
Punching, influences the sensing capabilities of sensor.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of light source driving circuit, light source driving method and flights
Time distance measuring sensor can reduce influence of the induction reactance effect of parasitic inductance in circuit to light source luminescent, improve measurement accuracy.
To solve the above-mentioned problems, the present invention provides a kind of light source driving circuits, comprising: light source, the sun of the light source
Pole is connected to power end；First switch circuit, the anode of the first switch circuit are connected to the cathode of the light source, and described
The cathode of one switching circuit connects low potential point, for controlling the on off operating mode between the cathode of the light source and low potential point；The
Two switching circuits, the second switch circuit on one side are connected to the anode of the light source, and the other end is connected to the first switch
The cathode of circuit, for controlling the on off operating mode between the power end and low potential point.
Optionally, comprising: the first switch circuit includes first switching element, and the anode of the first switching element connects
It is connected to the cathode of the light source, the cathode of the first switching element is connected to low potential point；The first switch circuit also wraps
The first control terminal is included, the control terminal of first switching element is connected to, for inputting first control signal to first switching element.
Optionally, pass through the first buffering between the first control terminal and the first switching element of the first switching element
Device connection.
Optionally, the second switch circuit includes second switch element, and the anode of the second switch element is connected to
The cathode of the anode of the light source, the second switch element is connected to the cathode of first switching element；The second switch electricity
Road further includes the second control terminal, is connected to the control terminal of second switch element, for inputting second to the second switch element
Control signal.
Optionally, pass through the second buffering between the second control terminal of the second switch element and the second switch element
Device connection.
Optionally, the first switching element includes: at least one in triode, field effect transistor and thyristor
Kind；The second switch element includes: at least one of triode, field effect transistor and thyristor.
Optionally, the light source includes light emitting diode, vertical cavity surface emitting laser, edge-emitting laser, Yi Jiguang
At least one of fibre laser.
Optionally, resistance is connected between the cathode of the first switching element and low potential point.
Technical solution of the present invention also provides a kind of light source driving method, comprising: provides above-mentioned light source driving circuit；Pass through
First control signal controls the on-off of the first switch circuit, so that the light source issues pulsed light；Pass through the second control letter
The on-off of number control second switch circuit so that the second switch circuit before first switch circuit conducting with
And it is connected after first switch circuit shutdown, turned off in first switch circuit conducting.
Optionally, the first control signal and second control signal are pulse control signal, and described first controls
Signal and the second control signal are non-overlapping or partly overlap.
Technical solution of the present invention also provides a kind of flight time distance measuring sensor, comprising: above-mentioned light source driving circuit.
Light source driving circuit of the invention has the first switch circuit of control light source luminescent, and is located at by the light source
The second switch circuit on road, before first switch circuit conducting or after second switch circuit shutdown, described second
Switching circuit is opened, so that the electric current on the circuit connection other than light source does not change or small change only occurs, from
And the influence of the parasitic inductance on circuit connection is reduced, the abruptness of the porch for the pulsed light that light source issues is improved, in turn
Improve the detection accuracy with the flight time distance measuring sensor of the light source driving circuit.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the light source driving circuit of the embodiment of the invention；
Fig. 2 is the equivalent circuit structure schematic diagram of the light source driving circuit of the embodiment of the invention；
Fig. 3 is the first control signal of the embodiment of the invention and the time diagram of second control signal.
Specific embodiment
Light source driving circuit provided by the invention, light source driving method and flight time ranging are passed with reference to the accompanying drawing
The specific embodiment of sensor elaborates.
Referring to FIG. 1, the structural schematic diagram of the light source driving circuit for the embodiment of the invention.
The light source driving circuit includes: light source D1, first switch circuit 101 and second switch circuit 102.
In the description of a specific embodiment of the invention, the high-voltage end of electronic component is known as anode, low-pressure end is known as yin
Pole.For example, anode is the source electrode of NMOS transistor for NMOS transistor, cathode is the drain electrode of NMOS transistor.
Wherein, the anode of the light source D1 is connected to power end VDD_LD, the anode of first switch circuit 101 are connected to institute
The cathode of light source D1 is stated, the cathode of first switch circuit 101 connects low potential point, for controlling the cathode and low electricity of the light source D1
On off operating mode between site；Described 102 one end of second switch circuit is connected to the anode of the light source D1, and the other end is connected to
The cathode of the first switch circuit 101, for controlling the on off operating mode between the power end VDD_LD and low potential point.This
In the description of the specific embodiment of invention, anode is that high potential point, the cathode of light source or circuit are the low electricity of light source or circuit
Site；Electric current is flowed into from anode, is flowed out from cathode.
In the specific embodiment, it can be LED diode or laser diode that the light source D1, which is light emitting diode,
Deng.The anode of the light source D1 is the anode of diode, and the cathode of light source D1 is the cathode of diode.In other specific embodiment parties
In formula, light source D1 can be in light emitting diode, vertical cavity surface emitting laser, edge-emitting laser and optical fiber laser
It is at least one.
In the specific embodiment, the first switch circuit 101 includes first switching element M1, the first switch member
The anode of part M1 is connected to the cathode of the light source D1, and the cathode of the first switching element M1 is connected to low potential point；It is described
First switch circuit 101 further includes the first control terminal I1, is connected to the first switching element M1, is used for the first switch
Element M1 inputs first control signal M1_SIG.In the specific embodiment, the low potential point is ground, the first switch member
The minus earth of part M1.
The first control signal M1_SIG is used to control the on off operating mode of the first switching element M1.When described first
Control signal M1_When the voltage of SIG is greater than the cut-in voltage of the first switching element M1, the first switching element M1 is led
Logical, the connection between cathode and the low potential point of light source D1, when the voltage for dropping to light source D1 increases, conducting electric current increases,
Until its conducting electric current is more than lasing threshold electric current, the light source D1 shines；As the first control signal M1_The voltage of SIG
When cut-in voltage less than the first switching element M1, disconnection between cathode and the low potential point of light source D1, light source D1 is not
It shines.
In the specific embodiment, by the between the first control terminal I1 and the anode of the first switching element M1
One buffer B1 connection, to stablize the first control signal M1 for inputting the first switching element M1_SIG, synchronised clock, removal
Noise improves driving capability, to improve the first control signal M1_Control effect of the SIG to first switching element M1.
In the specific embodiment, the first switching element M1 is field effect transistor.Such as the first switch member
Part M1 is NMOS transistor.The source electrode of the first switching element M1 is connect with the cathode of the light source D1, the first switch
The drain electrode of element M1 is connect with low potential point, and the grid of the first switching element M1 is connect with the first control terminal I1.?
In other specific embodiments, the first switching element M1 may include: triode, field effect transistor and thyristor etc.
At least one of element with switching characteristic.
The second switch circuit 102 includes second switch element M2, and the anode of the second switch element M2 is connected to
The cathode of the anode of the light source D1, the second switch element M2 is connected to the cathode of first switching element M1；Described second
Switching circuit 102 further includes the second control terminal I2, is connected to the control terminal of second switch element M2, is used for the second switch
Element M2 inputs second control signal M2SIG.
_
The second control signal M2_SIG is used to control the on off operating mode of the second switch element M2.When described second
Control signal M2_When the voltage of SIG is greater than the cut-in voltage of the second switch element M2, the second switch element M2 is led
It is logical, so that being connected between the anode of light source D2 and low potential point by second switch element M2；As the second control signal M2_
The disconnection when voltage of SIG is less than the cut-in voltage of the second switch element M2, between anode and the low potential point of light source D1.
In the specific embodiment, by the between the second control terminal I2 and the anode of the second switch element M2
Two buffer B2 connections, to stablize the second control signal M2 for inputting the second switch element M2_SIG, synchronised clock, removal
Noise, to improve the second control signal M2_Control effect of the SIG to second switch element M2.
In the specific embodiment, the second switch element M2 is field effect transistor, for example, the second switch is first
Part M2 is NMOS transistor.The source electrode of the second switch element M2 is connect with the anode of the light source D1, the second switch
The drain electrode of element M2 is connect with the cathode of first switching element M1, the grid of the second switch element M2 and second control
Hold I2 connection.In other specific embodiments, the second switch element M2 may include: triode, field effect transistor
And thyristor etc. has at least one of the element of switching characteristic.
In the specific embodiment, the conducting resistance of the first switching element M1 and second switch element M2 is equal or phase
Closely, it so that the electric current when first switch circuit 101 is connected with second switch circuit 102 is equal or close, is all larger than or waits
In the threshold current that the light source D1 shines.
In this specific embodiment, it is also connected between the cathode of the first switching element M1 and low potential point
Resistance R1, the electric current after being connected to avoid power end VDD_LD with low potential point are excessive.In other specific embodiments, institute
It states and is also possible to be directly connected between the cathode of first switching element M1 and low potential point, or according to circuit performance requirement
Other electronic components are connected between the cathode and low potential point of the first switching element M1.
A specific embodiment of the invention also provides a kind of flight time distance measuring sensor, including above-mentioned specific embodiment
Described in light source driving circuit, the flight time distance measuring sensor includes control module, with the light source driving circuit
First control terminal I1 and the second control terminal I2 connection, according to the period of the light source D1 pulsed light issued and pulsewidth demand, to institute
It states the first control terminal I1 and the second control terminal I2 sends first control signal M1 respectively_SIG and second control signal M2_SIG。
Referring to FIG. 2, for the schematic equivalent circuit of circuit in described Fig. 1.Wherein, the parasitism on circuit connection is shown
Inductance L1~L4.
Wherein parasitic inductance L1 is power end VDD_The parasitic inductance on circuit connection between LD and the anode of light source D1,
Parasitic inductance L2 is the parasitic inductance on the circuit connection between the cathode of light source D1 and the anode of first switch circuit 101, institute
The parasitic inductance on the circuit connection between the cathode and low potential point that parasitic inductance L3 is first switch circuit 101 is stated, it is described
Parasitic inductance L4 is the parasitic inductance on the circuit connection between the anode of second switch circuit 102 and the anode of light source D1.
In the light source driving circuit, light source D1, low potential point and other circuit elements be can integrate in same electricity
On the plate of road, due to being connected between light source D1 and low spot site and other circuit elements by connecting line, there are parasitic inductance, meetings
Large effect is generated to circuit.Illustrate only that inductance value is larger in Fig. 2, shine to light source D1 the parasitic electricity in several places being affected
, in other concrete modes, also there is parasitic inductance at other circuit connections in the light source driving circuit in sense.
In a specific embodiment of the invention, a kind of light source driving method of light source driving circuit is also provided.
The light source driving method specifically includes: controlling M1 by first control signal_First switch circuit described in SIG
101 on-off, so that the light source D1 issues pulsed light；The second switch circuit is controlled by second control signal M2_SIG
102 on-off, so that the second switch circuit 102 is before the first switch circuit 101 conducting and described first
It is connected after the shutdown of switching circuit 101, turned off in the first switch circuit 101 conducting.
Since flight time distance measuring sensor requires light source D1 to issue pulsed light, the first control signal M1_
SIG is also pulse signal, the first control signal M1_Unlatching electricity of the high level of SIG greater than the first switching element M1
Pressure, the first control signal M1_The low level of SIG is less than the cut-in voltage of the first switching element M1；When the first control
Signal M1_When SIG is high level, the first switching element M1 is opened, and light source D1 shines；As first control signal M1_SIG is
When low level, the first switching element M1 is disconnected, and light source D2 stops shining.So that the light source D1 is issued and described the
One control signal M1—The pulsed light of SIG impulsive synchronization.
Due to the power end VDD_On LD, light source D1 to this current path of low potential point, at least there is parasitic inductance
L1, parasitic inductance L2 and parasitic inductance L3, if only controlling the luminance of light source D1 by first switch circuit 101, respectively
Electric current at parasitic inductance position can follow the unlatching of first switch circuit 101 and disconnection to change, and parasitic inductance L1~
L3 can then hinder the generation of this change, and the porch for the pulsed light for causing light source D1 to issue such as rises or falls at the variations meeting
Delay is generated, to influence the sensing capabilities of sensor.
And in a specific embodiment of the invention, before the first switch circuit 101 conducting, first switch electricity
After road 101 turns off, the second switch circuit 102 is controlled by second control signal M2_SIG and is connected；In first switch electricity
When road 102 is connected, second control signal M2_SIG controls second switch circuit 101 and disconnects.So that the parasitic inductance L1,
Always with the presence of electric current on circuit connection where parasitic inductance L3 and parasitic inductance L4, so as to reduce the light source driving
The induction reactance effect of parasitic inductance in circuit improves the steepness of the porch for the pulsed light that light source D1 is issued, advantageously forms
The pulse of narrower width improves the accuracy of flight time distance measuring sensor.
Referring to FIG. 3, for the control letter of the first control signal M1_SIG of the embodiment of the invention and second
The time diagram of number M2_SIG.
The first control signal M1_SIG and second control signal M2_SIG is pulse control signal, and first controls
The phase phase difference 180 degree of signal M1_SIG and second control signal M2_SIG.Specifically, working as the first control signal M1_SIG
When for high level, the second control signal M2_SIG is low level；When the first control signal M1_SIG is low level,
The second control signal M2_SIG is high level, so that the first control signal M1_SIG and second control signal M2_SIG
For non-overlapping pulse control signal.
In other specific embodiments, it is contemplated that the requirement of the signal transmission delay and luminescent properties of device and route,
The timing of the signal of the first control signal M1_SIG and second control signal M2_SIG can be optimized.Described first
The signal edge of control signal M1_SIG and second control signal M2_SIG can have the overlapping of certain time, be prolonged with abatement device
Slow influence, so that second switch element M2 can be opened in time, after first switching element M1 shutdown to reach pulsed light waveform
Edge abruptness.
It, can be right according to factors such as power consumption requirements, the electromagnetic interferences of the driving circuit in other specific embodiments
The opening time of second switch element M2 is adjusted, and is also adjusted accordingly to the opening time of first switching element M1.
In order to further decrease the influence of parasitic inductance in circuit, may further adjust by the parasitic inductance L1~
The size of current of L4.In this specific embodiment, the conducting resistance of the first switching element M1 and second switch element M2
It is equal or close, so that the size of current by parasitic inductance does not also change or small change only occurs, to subtract
The influence of parasitic inductance on few circuit connection, improves the abruptness of the porch for the pulsed light that light source issues.
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 (11)
1. a kind of light source driving circuit characterized by comprising
The anode of light source, the light source is connected to power end；
First switch circuit, the anode of the first switch circuit are connected to the cathode of the light source, the first switch circuit
Cathode connect low potential point, for controlling the on off operating mode between the cathode of the light source and low potential point；
Second switch circuit, the second switch circuit on one side are connected to the anode of the light source, and the other end is connected to described
The cathode of one switching circuit, for controlling the on off operating mode between the power end and low potential point.
2. light source driving circuit according to claim 1 characterized by comprising the first switch circuit includes the
One switch element, the anode of the first switching element are connected to the cathode of the light source, the cathode of the first switching element
It is connected to low potential point；The first switch circuit further includes the first control terminal, is connected to the control terminal of first switching element, is used
In to first switching element input first control signal.
3. light source driving circuit according to claim 2, which is characterized in that the first control terminal of the first switching element
It is connect between the first switching element by the first buffer.
4. light source driving circuit according to claim 2, which is characterized in that the second switch circuit includes second switch
Element, the anode of the second switch element are connected to the anode of the light source, and the cathode of the second switch element is connected to
The cathode of first switching element；The second switch circuit further includes the second control terminal, is connected to the control of second switch element
End, for inputting second control signal to the second switch element.
5. light source driving circuit according to claim 4, which is characterized in that the second control terminal of the second switch element
It is connect between the second switch element by the second buffer.
6. light source driving circuit according to claim 4, which is characterized in that the first switching element include: triode,
At least one of field effect transistor and thyristor；The second switch element include: triode, field effect transistor with
And at least one of thyristor.
7. light source driving circuit according to claim 1, which is characterized in that the light source includes light emitting diode, vertical
At least one of cavity surface emitting lasers, edge-emitting laser and optical fiber laser.
8. light source driving circuit according to claim 2, which is characterized in that the cathode of the first switching element with it is described
Resistance is connected between low potential point.
9. a kind of light source driving method characterized by comprising
Such as light source driving circuit described in any item of the claim 1 to 8 is provided；
The on-off of the first switch circuit is controlled by first control signal, so that the light source issues pulsed light；
The on-off of the second switch circuit is controlled by second control signal, so that the second switch circuit is described first
It is connected before switching circuit conducting and after first switch circuit shutdown, closed in first switch circuit conducting
It is disconnected.
10. light source driving method according to claim 9, which is characterized in that the first control signal and the second control
Signal is pulse control signal, and the first control signal and the second control signal are non-overlapping or partly overlap.
11. a kind of flight time distance measuring sensor characterized by comprising such as light described in any item of the claim 1 to 8
Source driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811227989.4A CN109257848A (en) | 2018-10-22 | 2018-10-22 | Light source driving circuit, light source driving method and flight time distance measuring sensor |
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| CN201811227989.4A CN109257848A (en) | 2018-10-22 | 2018-10-22 | Light source driving circuit, light source driving method and flight time distance measuring sensor |
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| CN209497633U (en) * | 2018-10-22 | 2019-10-15 | 上海炬佑智能科技有限公司 | Light source driving circuit and flight time distance measuring sensor |
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