CN109788622B - 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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Abstract
The present invention relates to a light source control device, a control method thereof, and a time-of-flight sensor, the light source control device including: the current control module is used for outputting corresponding control signals according to the control target of the luminous current; the adjustable voltage source module is connected with the current control module and is used for outputting corresponding light source voltage according to a control signal of the current control module; the light source module is connected with the adjustable voltage source module, and the light source voltage output by the adjustable voltage source module controls the luminous current, so that light with corresponding power is emitted. The light source control device is beneficial to reducing power consumption and improving system performance.
Description
Technical Field
The present invention relates to the field of sensing technologies, and in particular, to a light source control device, a light source control method, and a time-of-flight sensor.
Background
The Time Of Flight (TOF) method is to measure the three-dimensional structure or three-dimensional contour Of a measured object by measuring the Time interval from transmission to reception Of a pulse signal from an instrument or the phase generated by a laser once traveling to and from the measured object. The TOF measuring instrument can obtain gray level images and distance images at the same time, and is widely applied to various fields such as somatosensory control, behavior analysis, monitoring, automatic driving, artificial intelligence, machine vision, automatic 3D modeling and the like.
Time of flight (TOF) sensors generally include: a light source module and a photosensitive module; the light source module is used for emitting pulse detection light with specific wave band and frequency, the detection light is reflected on the surface of the detected object, and the reflected light is received by the photosensitive module; the photosensitive module calculates the distance information of the measured object according to the time difference or the phase difference between the transmitted light wave and the received light wave.
The image effect obtained by the flight time sensor is influenced by the reflection coefficient of the measured object, when the object with high reflection coefficient and the object with low reflection coefficient exist in the image at the same time, overexposure of the object with the reflection coefficient easily occurs, and the underexposure of the object with the low reflection coefficient is caused, so that the image quality is seriously influenced. Therefore, in the prior art, a High Dynamic (HDR) condition is frequently met, a plurality of pictures with different exposure can be obtained by adjusting the power of detection light, and then the pictures are combined into one picture, so that an image with proper exposure of each object is finally obtained; or the optical power of the detection light is adjusted to ensure that the object with high reflection coefficient is not overexposed and the detection signal of the object with low reflection coefficient has a certain signal-to-noise ratio.
Therefore, it is important to quickly and accurately adjust the power of the detection light of the time-of-flight sensor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a light source control device, a light source control method and a flight time sensor so as to reduce the power consumption of light source control and improve the performance.
In order to solve the problem, the present invention provides a light source control apparatus including: the current control module is used for outputting corresponding control signals according to the control target of the luminous current; the adjustable voltage source module is connected with the current control module and is used for outputting corresponding light source voltage according to a control signal of the current control module; the light source module is connected with the adjustable voltage source module, and the light source voltage output by the adjustable voltage source module controls the luminous current, so that light with corresponding power is emitted.
Optionally, the current control module outputs a corresponding control signal according to a preset lighting current control target and a preset control flow.
Optionally, the method further comprises: the feedback module is connected to the current control module and is used for sending a feedback signal related to the luminous current of the light source module to the current control module; the current control module is used for adjusting a luminous current control target according to the feedback signal and outputting a corresponding control signal to the adjustable voltage source module.
Optionally, the feedback module is configured to detect a light emitting current of the light source module, and form a feedback signal corresponding to the light emitting current.
Optionally, the feedback module includes a photodiode and a conversion unit connected to the photodiode, where the photodiode is configured to receive light emitted by the light source module in a certain proportion and convert the light into a feedback current corresponding to the light-emitting current; the conversion unit is used for carrying out analog-to-digital conversion on the feedback current to form a feedback signal.
Optionally, the light source control device is used for a time-of-flight sensor, the time-of-flight sensor comprises an image processing module, and the feedback module is used for being connected to the image processing module, and forming a feedback signal according to the image information obtained by the image processing module.
Optionally, the adjustable voltage source module is configured to boost or buck the working voltage according to the control signal.
Optionally, the light source module includes a light emitting device and a driving unit for controlling an on or off state of the light emitting device.
Optionally, the device further comprises a capacitor, one end of the capacitor is grounded, the other end of the capacitor is connected to the output end of the adjustable voltage source module, the internal resistance of a connecting line between the output end of the adjustable voltage source module and the capacitor is R, the voltage adjustment time of the voltage input end of the light source module is T, T=2pi×RC, and the value of the capacitor C is determined by the voltage adjustment time.
The technical scheme of the invention also provides a time-of-flight sensor, which comprises: the light source control device according to any one of the above.
The technical scheme of the invention also provides a light source control method, which comprises the following steps: generating a corresponding control signal according to a control target of the luminous current; forming a corresponding light source voltage according to the control signal; the light source voltage controls the light emitting current, so that light with corresponding power is emitted.
Optionally, according to a preset lighting current control target and a preset control flow, a corresponding control signal is generated.
Optionally, the method further comprises: forming a feedback signal related to the light emitting current; and adjusting a control target of the luminous current according to the feedback signal, and generating a corresponding control signal.
Optionally, detecting the light-emitting current of the light emission, and forming a feedback signal related to the light-emitting current according to the light-emitting current.
Optionally, a photodiode is adopted to receive light emitted by the light source module in a certain proportion and convert the light into feedback current corresponding to the light-emitting current; and performing analog-to-digital conversion on the feedback current to form a feedback signal.
Optionally, when the light source control method is used for controlling the light source of the time-of-flight sensor, a feedback signal is formed according to the image information obtained by the time-of-flight sensor.
Optionally, the working voltage is boosted or reduced according to the control signal, so as to form a corresponding light source voltage.
The light source control device adjusts the light source voltage of the light source module through the current control module and the adjustable voltage source module so as to realize the adjustment of the luminous power, so that the light source control device not only can meet the requirement of laser safety, but also can optimize the High Dynamic (HDR) effect of imaging. The current control module can realize program control on the light source voltage, and can also be used for carrying out dynamic adjustment by combining luminous current information at the moment on the light source module as feedback, so that the luminous power adjustment of the light source module is more intelligent. And the voltage drop of elements in the light source module can be reduced, the heating is reduced, the power consumption is reduced, and the system stability is improved. The method is applied to the flight time sensor, and is favorable for improving the ranging accuracy and imaging effect of the flight time sensor and improving the user experience.
Drawings
FIG. 1 is a flow chart of a light source control method according to an embodiment of the invention;
fig. 2 to 5 are schematic structural views of a light source control device according to an embodiment of the present invention.
Detailed Description
In the prior art, the adjustment of the light source power is generally achieved by adjusting the on-resistance of a MOS transistor or other element connected in series with the light emitting element in the light source module to adjust the light emitting current of the light emitting element. Under the condition that the working voltage of the light source module is certain, the voltage drop of the light emitting element is limited, and when the current becomes small, larger voltage drop can be generated on other elements of the sensor chip, so that extremely large heat is generated, and the system performance and the user experience are affected.
The specific embodiment of the invention provides a mode for intelligently adjusting the voltage of a light source to adjust the luminous power of the light source.
The embodiment of the invention also provides a light source control method.
Fig. 1 is a flow chart of a light source control method according to an embodiment of the invention.
The light source control method comprises steps S1 to S3.
Step S1: and generating a corresponding control signal according to the control target of the luminous current.
The control signal may be a digital logic signal or an analog signal, and in one embodiment, the control signal is used to control an adjustable voltage source, so that the output voltage of the adjustable voltage source module changes, and thus the light source voltage is adjusted.
The corresponding control signal may be output to the adjustable voltage source module 102 according to a preset lighting current control target and control procedure.
The light-emitting current control target can be adjusted according to the feedback signal, and a corresponding control signal is output, wherein the feedback signal is related to the light-emitting current emitted at the previous moment. Specifically, the light-emitting current of the light emission can be detected, and a feedback signal related to the light-emitting current can be formed according to the light-emitting current. For example, a photodiode is used for receiving light emitted by the light source module in a certain proportion and converting the light into feedback current corresponding to the light-emitting current; and performing analog-to-digital conversion on the feedback current to form a feedback signal. When the light source control method is used for controlling the light source of the flight time sensor, a feedback signal can be formed according to the image information obtained by the flight time sensor.
Step S2: and forming corresponding light source voltage according to the control signal.
Under the action of the control signal, the internal resistance or other parameters of the adjustable voltage source are adjusted, so that the output voltage is changed, and the light source voltage is adjusted. In a specific embodiment, the adjustable voltage source module is connected to an operating voltage VDD, and is capable of performing a step-up or step-down process on the operating voltage VDD to output a suitable light source voltage VL. And a control signal is input to the adjustable voltage source module to control the boosting or reducing proportion of the adjustable voltage source module to the working voltage VDD, so that the light source voltage VL output by the adjustable voltage source module is adjusted. The adjustable voltage source module can be a DCDC converter, an LDO linear voltage stabilizer, a digital potentiometer and the like.
Step S3: the light source voltage controls the light emitting current, so that light with corresponding power is emitted.
The light emission may be performed using a photodiode or a light emitting device including a photodiode, an anode of which is connected to a light source voltage, and the larger the light source voltage, the larger the light emitting current in the case that the light emitting device is turned on. The light emitting device can be driven by a driving unit with a switching element, and the switching element is connected between the cathode of the light emitting device and the ground terminal and controls the on-off state of the light emitting device by controlling the on-off state of the switching element.
The method adjusts the luminous power by adjusting the light source voltage, can reduce the voltage drop of elements in a circuit, reduce heating, reduce power consumption and improve the system performance.
The specific embodiment of the invention also provides a light source control device for realizing the light source control method, and the light source control method is further described below with reference to the light source control device.
Fig. 2 is a schematic structural diagram of a light source control device according to an embodiment of the invention.
The light source control device includes: the device comprises a current control module 101, an adjustable voltage source module 102 and a light source module 103, wherein the adjustable voltage source module 102 is connected with the output end of the current control module 101, and the light source module 103 is used for being connected with the voltage output end of the adjustable voltage source module 102.
The current control module 101 is configured to output a corresponding control signal according to a control target of the light emitting current. The adjustable voltage source module 102 is connected to the current control module 101, and is configured to output a corresponding light source voltage according to a control signal of the current control module 101. The light source module 103 is connected with the adjustable voltage source module 102, and the light source voltage output by the adjustable voltage source module controls the luminous current, so that light with corresponding power is emitted.
The current control module 101 is configured to output a digital logic control signal, control the adjustable voltage source module 102, and control an internal resistance value or other parameters of the adjustable voltage source module 102 to change an output voltage of the adjustable voltage source module 102, thereby adjusting a light source voltage.
The adjustable voltage source module 102 is connected to an operating voltage V DD Can be applied to the working voltage V DD Step up or step down to output proper light source voltage V L . The current control module 101 controls the adjustable voltage source module 102 to operate at a voltage V by inputting a control signal to the adjustable voltage source module 102 DD To adjust the source voltage V output by the adjustable voltage source module 102 L Size of the product.
The adjustable voltage source module 102 may be a DCDC converter, an LDO linear regulator, a digital potentiometer, etc. In a specific embodiment, the adjustable voltage source module 102 is a digital potentiometer, and the digital potentiometer includes a vernier resistor, and the voltage output by the adjustable voltage source module 102 can be adjusted by controlling the resistance value of the vernier resistor through a logic digital control signal.
The light source module 103 includes a light emitting device D1 and a driving unit 1031, and the driving unit 1031 is used to control an on or off state of the light emitting device D1. In one embodiment, the light emitting device D1 is a photodiode, and in other embodiments, the light emitting device D1 is a light emitting device including a photodiode element, such as an LED diode, a laser diode, or a VCSEL laser, etc., the greater the current of the light emitting device D1, the greater the light intensity emitted by the light emitting device D1, and the greater the light power. The driving unit 1031 includes a switching element M1 connected between the cathode of the light emitting device D1 and the ground terminal, and a voltage or current source S1 connected to the control terminal of the switching element M1 through a buffer B1 for controlling the on/off state of the switching element M1, thereby controlling the on/off state of the light emitting device D1. Whether or not the light emitting device D1 emits light is controlled by the driving unit 1031, and the light emitting current of the light emitting device D1 is controlled by the light source voltage V input from the anode of the light emitting device D1 L And (5) determining. The light-emitting power of the light source module 103 passes through the light source voltage V L The adjustment does not cause the increase of the pressure drop inside the light source module 103, so that the heat generated by the light source module 103 can be reduced, and the system performance is improved.
In this embodiment, the light emitting module 103 further includes a capacitor C1, where one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected to the output end of the adjustable voltage source module 102, for stabilizing the light source voltage V at the anode end, i.e. the voltage input end, of the light source module 103 L Avoiding the light source voltage V L Rapid changes occur. Due to the capacitive reactance of the capacitor C1, when the voltage of the output terminal of the adjustable voltage source module 102 changes, a period of time is required for the voltage V of the light source at the anode terminal of the light emitting module 103 L Can be consistent with the voltage at the output of the adjustable voltage source module 102. An internal resistance of a connection line between the output end of the adjustable voltage source module 102 and the capacitor C1 is r, and a voltage input of the light source module 103The single voltage adjustment time of the input terminal is T, t=τ=2pi×rc. Since the resistance of the internal resistance r is determined by a line, it is difficult to adjust, and thus the voltage adjustment time T of the voltage input terminal of the light source module 103 can be adjusted by adjusting the value of the capacitor C1. In a specific embodiment, the light source control device is used for a time-of-flight sensor, and the voltage adjustment time T is short, so that a certain requirement on the adjustment speed is met. For example, the voltage adjustment time T is less than the frame rate at which the time-of-flight sensor acquires images. In one embodiment, the time of flight sensor acquires an image frame with a time of 33ms, wherein the exposure time is 20ms, and the rest 13ms is used for preparing the light source voltage VL required by the next exposure, then T<13ms. The appropriate capacitor C1 can be selected according to the requirement of the single voltage adjustment time T and the internal resistance r of the circuit, so that the light source voltage V of the voltage input end of the light source module 103 L Can meet the requirements.
In one embodiment, the current control module 101 is configured to output a corresponding control signal to the adjustable voltage source module 102 according to a preset lighting current control target and control procedure. For example, the light source control device is used for a time-of-flight sensor and is controlled according to a preset method. For example, three exposures are performed, the light power is sequentially small, medium and large each time, and then a perfect high-dynamic (HDR) graph is synthesized according to the confidence of the distance parameter of each pixel. The current control module 101 outputs a corresponding control signal according to a preset light emitting current control target, i.e. I1> I2> I3, where the control signal is a digital signal, and is used to control the adjustable voltage source module 102 to sequentially output corresponding light source voltages V1, V2 and V3, and V1> V2> V3, so that the exposure light emitting current of the light source module 103 is sequentially I1, I2 and I3, and control over the light source light emitting power is realized.
Referring to fig. 3, in another embodiment, the current control module 101 is configured to adjust a lighting current control target according to a feedback signal, and output a corresponding control signal to the adjustable voltage source module. The feedback signal is related to the light emitting current emitted by the light source module 103 at the previous moment. The current control module 101 can be calibrated before leaving the factory through a specific feedback mode before leaving the factory of the module or the product, so as to obtain an accurate feedback coefficient, and eliminate mismatch and non-ideal factors of circuit components.
In this embodiment, the light source control device further includes a feedback module 201, where the feedback module 201 is connected to the current control module 101, and is configured to send a feedback signal related to the light emitting current of the light source module 103 to the current control module 101; the current control module 101 is configured to adjust a lighting current control target according to the feedback signal, and output a corresponding control signal to the adjustable voltage source module 102. The feedback module 201 may be in electrical connection with the light source module 103 or may otherwise obtain feedback information from the light source module 103.
In this embodiment, the feedback module 201 is connected to a circuit where the light emitting device D1 of the light source module 103 is located, and is configured to detect a light emitting current of the light source module 103 and form a feedback signal corresponding to the light emitting current. For example, the feedback module 201 may include a detection unit, configured to detect a light emitting current of the light emitting device D1, and feed back the light emitting current to the current control module 101, where the current control module 101 sends a corresponding control signal to the adjustable voltage source module 102 according to the digital signal according to a preset program. The feedback signal may be an analog signal or a digital signal after conversion. For example, when the light emitting current feedback signal of the light emitting device D1 is greater than a set value, the current control module 101 sends a step-down control signal to the adjustable voltage module 102 to reduce the light source voltage of the light source module 103. Alternatively, the current control module 101 is provided with a logic program, and according to the feedback signal, the corresponding control signal is obtained by using internal logic operation in combination with factors such as required image quality and eye safety standard.
Fig. 4 is a schematic structural diagram of a light source control device according to an embodiment of the invention.
The feedback module 201 of the light source control device comprises a photodiode D2 and a conversion unit 2011 connected with the photodiode D2, wherein the photodiode D2 is used for receiving light emitted by the light source module 103 in a certain proportion and converting the light into a feedback current corresponding to the light-emitting current; the conversion unit 2011 is configured to perform analog-to-digital conversion on the feedback current to form a feedback signal. The greater the light intensity emitted by the light source module 103, the greater the feedback current generated by the photodiode D2, the feedback current being proportional to the light emission current of the light source module 103, and thus the feedback signal being related to the light emission current.
The specific embodiment of the invention also provides a time-of-flight sensor comprising the light source control device.
Referring to fig. 5, a schematic diagram of a time-of-flight sensor according to an embodiment of the invention is shown.
The time-of-flight sensor includes the light source control device, and any one or two of the adjustable voltage source module 102 and the current control module 101, and the driving unit of the light source module 103 may be integrated on a driving chip of the time-of-flight sensor. In other embodiments, the adjustable voltage source module 102 and/or the current control module 101 may also be integrated separately on a separate chip.
The time-of-flight sensor further comprises an image processing module 301, and as a specific embodiment of the present invention, the feedback module 201 of the light source control device is connected to the image processing module 301, and is configured to form a feedback signal according to the image information obtained by the image processing module 301. The feedback signal is related to the light energy of each pixel obtained by the image processing module, and the light energy of each pixel is related to the light emitting current of the light source module 103, and the larger the light emitting current is, the larger the light energy value obtained by each pixel is. The feedback signal may be a digital or analog signal corresponding to the optical energy value. Alternatively, the feedback signal may include the light energy of each pixel and confidence information of the distance information, for example, when the confidence of the distance information obtained by the pixel decreases, the current control module 101 may control the adjustable voltage source module 102 to increase or decrease the output light source voltage VL to increase the accuracy of the sensor distance detection. The feedback signal may also be related to the reflectivity of the measured object obtained by the image processing module 301, for example, the reflectivity of the black object is low, so that the light energy obtained by each pixel is small, and the luminous intensity needs to be increased; the reflectivity of the white object is high, so that the light energy obtained by each pixel is large, and the luminous intensity needs to be reduced.
The light source control device adjusts the light source voltage of the light source module through a current control module and an adjustable voltage source module so as to realize the adjustment of the luminous power. The current control module can realize program control on the light source voltage, and can also be used for carrying out dynamic adjustment by combining luminous current information at the moment on the light source module as feedback, so that the luminous power adjustment of the light source module is more intelligent. And the voltage drop of elements in the light source module can be reduced, the heating is reduced, the power consumption is reduced, and the system stability is improved.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A light source control apparatus, comprising:
the current control module is used for outputting corresponding control signals according to the control target of the luminous current;
the adjustable voltage source module is connected with the current control module and is used for outputting corresponding light source voltage according to a control signal of the current control module;
the light source module is connected with the adjustable voltage source module, and the light source voltage output by the adjustable voltage source module controls the luminous current so as to emit light with corresponding power;
further comprises: the feedback module is connected to the current control module and is used for sending a feedback signal related to the luminous current of the light source module to the current control module; the current control module is used for adjusting a luminous current control target according to the feedback signal and outputting a corresponding control signal to the adjustable voltage source module;
the light source control device is used for a time-of-flight sensor, the time-of-flight sensor comprises an image processing module, the feedback module is used for being connected to the image processing module, and a feedback signal is formed according to image information obtained by the image processing module, and is related to the obtained light energy of each pixel and the confidence information of the distance information obtained by the image processing module or related to the reflectivity of the measured object obtained by the image processing module.
2. The light source control device according to claim 1, wherein the adjustable voltage source module is configured to boost or buck an operating voltage according to the control signal.
3. A light source control apparatus according to claim 1, wherein the light source module includes a light emitting device and a driving unit for controlling an on or off state of the light emitting device.
4. The light source control device according to claim 1, further comprising a capacitor, one end of the capacitor is grounded, the other end of the capacitor is connected to the output end of the adjustable voltage source module, the internal resistance of the connection line between the output end of the adjustable voltage source module and the capacitor is R, the voltage adjustment time of the voltage input end of the light source module is T, t=2pi×rc, and the value of the capacitor C is determined by the voltage adjustment time.
5. A time-of-flight sensor, comprising: the light source control apparatus according to any one of claims 1 to 4.
6. A light source control method, characterized by comprising:
generating a corresponding control signal according to a control target of the luminous current;
forming a corresponding light source voltage according to the control signal;
controlling the light-emitting current by the light source voltage to emit light with corresponding power
Further comprises: forming a feedback signal related to the light emitting current; according to the feedback signal, adjusting a control target of the luminous current and generating a corresponding control signal;
when the light source control method is used for controlling the light source of the flight time sensor, a feedback signal is formed according to the image information obtained by the flight time sensor, and the feedback signal is related to the light energy of each pixel and the confidence information of the distance information or the reflectivity of the measured object.
7. The method of claim 6, wherein the operating voltage is boosted or dropped according to the control signal to form a corresponding light source voltage.
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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 |
| CN110456380B (en) * | 2019-07-31 | 2021-12-28 | 炬佑智能科技(苏州)有限公司 | Time-of-flight sensing camera and depth detection method thereof |
| 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 |
| CN113807172B (en) * | 2021-08-11 | 2022-10-18 | 荣耀终端有限公司 | Face recognition method and device |
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