CN114578318A - Open-loop automatic gain control method and circuit for photoelectric sensing distance measuring system - Google Patents
Open-loop automatic gain control method and circuit for photoelectric sensing distance measuring system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
- G01S7/4918—Controlling received signal intensity, gain or exposure of sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/444—Compensating; Calibrating, e.g. dark current, temperature drift, noise reduction or baseline correction; Adjusting
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the field of photoelectric sensing distance measurement technology, and discloses an open-loop automatic gain control method and a circuit for a photoelectric sensing distance measurement system, wherein the method comprises the following steps: acquiring a direct current level and a signal amplitude from a first-stage amplifying circuit of a photoelectric sensing distance measuring system; determining an automatic gain control start-control voltage; controlling the starting control voltage based on the automatic gain, adjusting the control depth of the automatic gain control, performing the automatic gain control according to the direct current level and the signal amplitude, and generating an attenuated first-stage output signal; transmitting the attenuated first-stage output signal to a second-stage amplifying circuit; the value of the attenuated first-stage output signal amplified by the second-stage amplifying circuit can correspond to a longer measuring distance in a preset range. The invention has the advantages of improving the problems of short measuring distance and narrow measuring range of the photoelectric sensing distance measuring system and enlarging the distance measuring range of the photoelectric sensing distance measuring system.
Description
Technical Field
The invention relates to the field of photoelectric sensing distance measurement technology, in particular to an open-loop automatic gain control method and circuit for a photoelectric sensing distance measurement system.
Background
The photoelectric sensing distance measuring system detects the distance position of an object and is realized based on the identification of the intensity of a light signal reflected by the object back to a sensor.
In the related art, when detecting the distance position of an object, firstly, the same photoelectric sensing distance measuring system is used for testing and recording, and the photoelectric conversion characteristic, namely the linear relation between the detection voltage value and the measurement distance, is determined. Then, a receiving circuit in the system receives the optical signal reflected by the object, converts the optical signal into a voltage value, and then the distance position of the object can be determined through the known photoelectric conversion characteristics.
With respect to the related art in the above, the inventors found that: when the distance position of an object is determined by the photoelectric sensing distance measuring system, the slope of the linear section of the voltage value converted by the receiving circuit is larger, so that the distance measured by the photoelectric sensing distance measuring system is shorter, and the measuring range is narrower.
Disclosure of Invention
In order to solve the problems that the distance measured by a photoelectric sensing distance measuring system is short and the measuring range is narrow and increase the distance measuring range of the photoelectric sensing distance measuring system, the application discloses an open-loop automatic gain control method and circuit for the photoelectric sensing distance measuring system.
In a first aspect, the present application discloses an open-loop automatic gain control method for a photoelectric sensing ranging system, which adopts the following technical scheme:
the open-loop automatic gain control method for the photoelectric sensing distance measuring system comprises the following steps:
acquiring a direct current level and a signal amplitude from a first-stage amplifying circuit of a photoelectric sensing distance measuring system;
determining an automatic gain control start-control voltage; the automatic gain control starting control voltage is determined by calculation according to the direct current level and the signal amplitude of the first-stage amplifying circuit;
adjusting the control depth of automatic gain control based on the automatic gain control start-up voltage, and performing automatic gain control according to the direct current level and the signal amplitude to generate an attenuated first-stage output signal; the attenuation of the attenuated first-stage output signal is increased along with the increase of the signal amplitude;
transmitting the attenuated first-stage output signal to a second-stage amplifying circuit; the value of the attenuated first-stage output signal amplified by the second-stage amplifying circuit can correspond to a longer measuring distance in a preset range.
By adopting the technical scheme, after the direct current and the signal amplitude of the first amplifying circuit are acquired according to the measuring range, the automatic gain control starting control voltage can be confirmed and set, and further automatic gain control is realized, so that the attenuated first-stage output signal can correspond to more signal amplitudes in the preset range, namely, the photoelectric sensing ranging system can correspond to more signal amplitudes in the preset range, the measuring range is increased in the same voltage variation range, the photoelectric conversion characteristic is improved, and in the photoelectric conversion process, the slope of the linear section of the voltage value converted by the receiving circuit is reduced, the measured distance of the system is improved to be shorter, the narrow measuring range is increased, and the distance measuring range of the photoelectric sensing ranging system is enlarged.
Optionally, the determining the automatic gain control start-up voltage further includes:
before the circuit enters a steady state, the output information of the first-stage amplifying circuit is subjected to voltage compensation, and the voltage compensation is used for reducing the amplitude change of the output signal of the first-stage amplifying circuit.
By adopting the technical scheme, the amplitude change of the output signal of the first-stage amplifying circuit is reduced before the output information of the first-stage amplifying circuit enters a stable state during electrification, the uncertainty is reduced when an object is detected near a set threshold critical point, the detection repetition precision is improved, and the misjudgment condition of the detection is reduced.
In a second aspect, the present application discloses an open-loop automatic gain control circuit for a photoelectric sensing ranging system, which adopts the following technical scheme:
an open-loop automatic gain control circuit for a photo-electric sensing ranging system, comprising:
the regulating and controlling circuit comprises an access end, an output end and a grounding end, wherein the access end is used for being connected with a first-stage amplifying circuit in the photoelectric sensing distance measuring system and receiving a direct current level and a signal amplitude from the first-stage amplifying circuit, the output end is used for being connected with a second-stage amplifying circuit in the photoelectric sensing distance measuring system and transmitting an attenuated first-stage output signal to the second-stage amplifying circuit, and the grounding end is grounded;
the automatic gain control starting circuit comprises a voltage output end and a voltage input end, wherein the voltage input end is used for accessing automatic gain control starting voltage, and the voltage input end is connected with the regulating and controlling circuit and used for outputting voltage to the regulating and controlling circuit.
By adopting the technical scheme, the direct current and the signal amplitude of the first-stage amplifying circuit are firstly obtained, the automatic gain control starting and controlling voltage is calculated outside, then after the voltage input end is connected with the known automatic gain control starting and controlling voltage, the regulating and controlling circuit generates the attenuated first-stage output signal according to the direct current and the signal amplitude and sends the attenuated first-stage output signal to the second-stage amplifying circuit, so that the automatic gain control is realized, the photoelectric conversion characteristic is improved, the slope of the linear section of the voltage value converted by the receiving circuit is reduced in the photoelectric conversion process, the problems that the system measurement distance is short and the measurement range is narrow are solved, and the distance measurement range of the photoelectric sensing ranging system is enlarged.
Optionally, the control circuit includes:
the voltage drop regulation and control module is connected with the first-stage amplification circuit, the automatic gain start-control circuit and the second-stage amplification circuit and is used for establishing corresponding voltage drop relations among the access end, the output end and the voltage output end on the voltage value;
and the voltage regulation and control module is connected with the automatic gain control starting circuit and the voltage drop regulation and control module, and is used for regulating and controlling the voltage of the voltage output end according to the current and setting the automatic gain control starting voltage more conveniently.
By adopting the technical scheme, the voltage drop regulation and control module is beneficial to more accurately setting the automatic gain control start control voltage, the voltage drop regulation and control module is matched with the voltage regulation and control module to adaptively regulate the attenuated first-stage output signal according to the direct current level and the signal amplitude, and the attenuation of the attenuated first-stage output signal is increased along with the increase of the signal amplitude, so that the photoelectric conversion characteristic is improved, the slope of a linear section of a voltage value converted by a receiving circuit in the photoelectric conversion characteristic is improved, the problem that the measurement distance of the system is shorter and the measurement range is narrower is solved, and the distance measurement range of the photoelectric sensing ranging system is enlarged.
Optionally, the pressure drop regulating module includes:
the voltage division unit is connected with the first-stage amplification circuit and used for protecting the circuit and realizing voltage division;
and the voltage drop generating unit is connected with the voltage dividing unit, the voltage regulating and controlling module and the automatic gain starting and controlling circuit and is used for establishing a corresponding voltage drop relation among the access end, the output end and the voltage output end on a voltage value.
By adopting the technical scheme, the voltage drop generation unit is provided with the automatic gain control start control voltage which is beneficial to being more accurately set, the first-stage output signal after attenuation is adaptively adjusted according to the direct current level and the signal amplitude by matching with the voltage regulation and control module, the attenuation of the first-stage output signal after attenuation is increased along with the increase of the signal amplitude, the photoelectric conversion characteristic is improved, the slope of a linear section of a voltage value converted by the receiving circuit in the photoelectric conversion characteristic is improved, the problem that the measurement distance of the system is shorter and the measurement range is narrower is solved, and the distance measurement range of the photoelectric sensing ranging system is enlarged.
Optionally, the voltage dividing unit includes a first resistor R1, the voltage drop generating unit includes a first diode D1 and a second diode D2, one end of the first resistor R1 is connected to the first-stage amplifying circuit, the other end of the first resistor R1 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the second diode D2 and the second-stage amplifying circuit, and the cathode of the second diode D2 is connected to the voltage regulating module and the automatic gain start-up control circuit.
By adopting the technical scheme, for circuit conduction, a definite voltage drop relationship exists between the voltage of the cathode point of the second diode D2 and the voltage of the anode point of the first diode D1, which is beneficial to more accurately setting the automatic gain control start control voltage, and the attenuated first-stage output signal is adaptively adjusted according to the direct current and the signal amplitude by matching with the voltage regulation and control module, and the attenuation of the attenuated first-stage output signal is increased along with the increase of the signal amplitude, so that the photoelectric conversion characteristic is improved, the slope of a linear section of the voltage value converted by the receiving circuit is reduced in the photoelectric conversion characteristic, the problem that the system measurement distance is short and the measurement range is narrow is solved, and the distance measurement range of the photoelectric sensing ranging system is enlarged.
Optionally, a compensation module is coupled between the voltage output end of the automatic gain start-control circuit and the voltage regulation and control module and between the voltage output end of the automatic gain start-control circuit and the voltage drop regulation and control module, and is used for compensating voltage fluctuation generated before the voltage drop regulation and control module enters a steady state.
By adopting the technical scheme, the compensation module is favorable for compensating voltage fluctuation generated before the voltage drop regulation and control module enters a stable state, so that the voltage drop regulation and control module enters a relatively stable state when starting to work, and the measurement accuracy is improved.
Optionally, the compensation module includes:
the first compensation unit is connected with the voltage output end of the automatic gain start-control circuit and used for voltage division and enabling voltage division parameters of the compensation module to be consistent with voltage division parameters of the voltage division unit;
and the second compensation unit is connected with the first compensation unit, the voltage drop regulation and control module and the voltage regulation and control module and is used for compensating voltage fluctuation generated before the voltage drop regulation and control module enters a steady state.
Through adopting above-mentioned technical scheme, being provided with of first compensation unit and second compensation unit does benefit to and makes pressure drop regulation and control module get into relatively stable state promptly when beginning work to improve the accuracy of measuring.
Optionally, the first compensation unit includes a third resistor R3, the second compensation unit includes a third diode D3 and a fourth diode D4, one end of the third resistor R3 is connected to the voltage output end of the agc circuit, the other end of the third resistor R3 is connected to an anode of the fourth diode D4, a cathode of the fourth diode D4 is connected to an anode of the third diode D3, and a cathode of the third diode D3 is connected to a cathode of the second diode D2 and the voltage regulation module.
By adopting the technical scheme, before the steady state is reached, the parameters of the third diode D3, the fourth diode D4 and the third resistor R3 are consistent with the parameters of the first diode D1, the second diode D2 and the first resistor R1, the current of the compensation circuit gradually rises along with the conduction of the diodes, the rising trend of the current is consistent with the voltage falling trend of the cathode point of the second diode D2 caused by the first diode D1 and the second diode D2, and therefore the accuracy of measurement is improved.
Optionally, the voltage regulation and control module includes:
and the voltage regulation and control unit is connected with the second compensation unit and the voltage drop generation unit and used for increasing the voltage of a connection point between the second compensation unit and the voltage drop generation unit according to the current.
By adopting the technical scheme, the voltage drop generating unit is favorably matched to generate the attenuated first-stage output signal which is attenuated and amplified along with the increase of the signal amplitude, so that the photoelectric conversion characteristic is further improved.
Optionally, the voltage regulation and control unit employs a second resistor R2, one end of the second resistor R2 is connected to the cathode of the second diode D2 and the cathode of the third diode D3, and the other end of the second resistor R2 is grounded;
or the voltage regulation and control unit adopts a potentiometer RP1, a slide sheet of the potentiometer RP1 is connected with a cathode of the second diode D2 and a cathode of the third diode D3, one end of the potentiometer RP1 is connected with a cathode of the second diode D2 and a cathode of the third diode D3, and the other end of the potentiometer RP1 is grounded.
Through adopting above-mentioned technical scheme, be favorable to increasing the voltage of the cathode point position of second diode D2 according to the electric current fast, or be favorable to providing convenience for the regulation of automatic gain control start control voltage.
In a third aspect, the present application discloses a photoelectric sensing ranging system, which adopts the following technical scheme:
a photoelectric sensing distance measurement system comprises the open-loop automatic gain control circuit for the photoelectric sensing distance measurement system.
By adopting the technical scheme, after the direct current and the signal amplitude of the first amplifying circuit are acquired according to the measuring range, the automatic gain control starting control voltage can be confirmed and set, so that automatic gain control is realized, more signal amplitudes can be corresponding to the attenuated first-stage output signal in the preset range, the measuring range is increased in the same voltage variation range, the photoelectric conversion characteristic is improved, the slope of a linear section of the voltage value converted by the receiving circuit is reduced in the photoelectric conversion characteristic, the problem that the measuring distance of the system is short and the measuring range is narrow is solved, and the distance measuring range of the photoelectric sensing distance measuring system is enlarged.
Drawings
Fig. 1 is a flowchart of a method of open-loop automatic gain control for an optical-electrical sensing ranging system according to an embodiment of the present application.
FIG. 2 is a schematic circuit diagram of an open-loop automatic gain control circuit for an electro-optical sensing ranging system according to an embodiment of the present disclosure.
Fig. 3 is a graph of a photoelectric conversion characteristic curve a and a curve b in one embodiment of the present application.
FIG. 4 is a schematic circuit diagram of an open-loop automatic gain control circuit for an electro-optical sensing ranging system according to an embodiment of the present application.
FIG. 5 is a schematic circuit diagram of an open-loop automatic gain control circuit for an electro-optical sensing ranging system according to an embodiment of the present application.
Description of reference numerals:
1. a regulation circuit; 11. a pressure drop regulation module; 111. a voltage dividing unit; 112. a pressure drop generating unit; 12. a voltage regulation module; 2. an automatic gain start-up control circuit; 3. a compensation module; 31. a first compensation unit; 32. and a second compensation unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-5 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Example 1
Referring to fig. 1, an embodiment of the present application discloses an open-loop automatic gain control method for a photoelectric sensing ranging system, including the following steps:
and S100, acquiring a direct current level and a signal amplitude from a first-stage amplifying circuit of the photoelectric sensing distance measuring system.
Specifically, the first-stage amplification circuit is electrically connected with an open-loop automatic gain control circuit for the photoelectric sensing distance measuring system, and the first-stage amplification circuit outputs signal amplitude changing according to the measuring distance and a preset and constant direct current level to the open-loop automatic gain control circuit for the photoelectric sensing distance measuring system.
And S200, determining the starting control voltage of the automatic gain control.
Specifically, the automatic gain control start-control voltage is determined by calculation according to the direct current level and the signal amplitude of the first-stage amplification circuit. And an external system used for calculating and inputting the automatic gain control start-control voltage also simultaneously acquires the direct current level and the signal amplitude output by the first-stage amplification circuit, then calculates the automatic gain control start-control voltage corresponding to different signal amplitudes according to the circuit structure and parameters of the open-loop automatic gain control circuit, and inputs the automatic gain control start-control voltage into the open-loop automatic gain control circuit.
The calculation steps of the automatic gain control start control voltage are as follows: adding the direct current level output by the first-stage amplifying circuit and the signal amplitude; and then subtracting the total voltage drop in the open-loop automatic gain control circuit.
And S300, adjusting the control depth of automatic gain control based on the automatic gain control start-up voltage, performing automatic gain control according to the direct current level and the signal amplitude, and generating an attenuated first-stage output signal.
It should be noted that the attenuation of the attenuated first stage output signal increases as the signal amplitude increases.
Specifically, referring to fig. 2, in the open-loop agc circuit, the agc start-up voltage is the voltage applied to the positive input terminal of the operational amplifier U1. When the compensation module 3 is not added in the open-loop automatic gain control circuit, the voltage of the point A is consistent with the starting control voltage of the automatic gain control, the setting of the starting control voltage of the automatic gain control is determined according to the direct current level of the first-stage amplification circuit and the amplitude of the detected signal, and the detected signal can pass through the subsequent-stage amplification circuit without attenuation when the farthest distance is measured.
The distance description is made based on the calculation step of the automatic gain control activation voltage in S200. For example: in a photosensor system with a measurement range of 40mm-1000mm, the dc level output by the first stage amplifier circuit is 1.2V, and at 1000mm, the amplitude of the signal detected by the first stage amplifier circuit is 0.4V, and at the time of farthest distance detection, the total amplitude output by the first stage amplifier circuit is 1.2V +0.4V =1.6V, and assuming that the conduction voltages of the first diode D1 and the second diode D2 are the same and are both 0.6V, the cathode voltage of the first diode D1 needs to be lower than 1.6V-0.6V =1.0V, so the automatic gain control start control voltage is 1.0V-0.6V = 0.4V.
In the open-loop automatic gain control circuit, when the first-stage amplification circuit outputs a strong signal, the current flowing through the second diode D2 and the voltage regulation unit increases, the voltage at the point a increases, and the voltage at the point B increases, and under the condition that the output of the first-stage amplification circuit is not changed, the first diode D1 attenuates the signal input to the second-stage amplification circuit greatly. On the contrary, when the output of the first-stage amplifying circuit is small, the current flowing through the second diode D2 and the voltage regulating unit is reduced, the voltages at the point a and the point B are also relatively reduced, the attenuation of the first diode D1 to the signal input to the second-stage amplifying circuit is small, and automatic gain control is realized. The attenuated first-stage output signal is the signal input to the second-stage amplifying circuit after the automatic gain control is realized.
And S400, transmitting the attenuated first-stage output signal to a second-stage amplifying circuit.
Referring to fig. 3, in the related art, in the range of the linear voltage amplitude variation of the photoelectric conversion characteristic curve a, the corresponding measurement distance is short because the slope of the linear voltage amplitude segment of the photoelectric conversion characteristic curve a is large, that is: within the known voltage amplitude variation range, the voltage value corresponds to less measuring distance. The signal amplitude detected by the first-stage amplifying circuit is converted into an attenuated first-stage output signal which is attenuated and increased along with the increase of the signal amplitude after automatic gain control, and the value of the signal amplified by the second-stage amplifying circuit can correspond to more measuring distances in a preset range. For example: in the related art, within the range of voltage value of 4.8V-1.6V, the corresponding measuring distance range is 40mm-300mm, under the effect of the technical scheme of the embodiment of the application, the photoelectric conversion characteristic curve b corresponds to more measuring distances, and the measuring distance range reaches 40mm-1000 mm.
Optionally, referring to fig. 1 and fig. 2, determining the agc start-up voltage further includes:
and S201, before the steady state is achieved, voltage compensation is carried out on the output information of the first-stage amplifying circuit.
This step is used to reduce the amplitude variation of the output signal of the first stage amplification circuit when the diode is not in steady state.
Specifically, in the initial stage of power-up, if not compensated, the voltage at the point a drops from high to low due to the changes of the internal resistances and voltage drops of the first diode D1 and the second diode D2, and cannot be stabilized until the first diode D1 and the second diode D2 are fully turned on, which takes about 1 minute. Because the change of the voltage of the point A can directly influence the change of the voltage of the point B, after the change is amplified by the second-stage amplifying circuit, larger voltage fluctuation can be generated, the accurate positioning can be seriously influenced, and the object detection is misjudged. After the compensation module 3 is connected, it should be noted that the parameters of the third diode D3, the fourth diode D4 and the third resistor R3 are the same as the parameters of the first diode D1, the second diode D2 and the first resistor R1. Therefore, the current of the compensation module 3 gradually rises with the conduction of the diode, the rising trend of the current is consistent with the voltage falling trend of the point a caused by the first diode D1 and the second diode D2, the voltage generated by the current on the voltage regulation and control unit is used for compensating the voltage falling of the point a caused by the conduction of the first diode D1 and the second diode D2 until the diodes are all stable, and the voltage of the point a is stabilized in the process, so that the voltage of the point B is also stabilized.
The implementation principle of the embodiment 1 is as follows: after the voltage at the point a is determined, the voltage at the point B is the voltage at the point a plus the tube voltage drop of the second diode D2. The output signal of the first stage amplifier circuit can be output to the second stage amplifier circuit only when the voltage greater than the point B is added to the tube voltage drop of the first diode D1. The gain control of the amplifying circuit is automatically realized by automatically controlling the voltage of the point A according to the amplitude of the output signal of the first-stage amplifying circuit.
Example 2
Referring to fig. 4, an embodiment of the present application discloses an open-loop automatic gain control circuit for a photo-sensing ranging system. The open-loop automatic gain control circuit for the photoelectric sensing distance measuring system comprises a regulating circuit 1 and an automatic gain starting control circuit 2. The regulating and controlling circuit 1 comprises an access end, an output end and a grounding end, wherein the access end is used for being connected with the first-stage amplifying circuit and receiving the direct current and the signal amplitude from the first-stage amplifying circuit, the output end is used for being connected with the second-stage amplifying circuit and transmitting the attenuated first-stage output signal to the second-stage amplifying circuit, and the grounding end is grounded. The automatic gain control circuit 2 comprises a voltage output end and a voltage input end, wherein the voltage input end is used for accessing automatic gain control voltage, and the voltage output end is connected with the regulating circuit 1 and used for outputting voltage to the regulating circuit 1.
Optionally, the automatic gain start-control circuit 2 includes an automatic gain start-control unit, and the automatic gain start-control unit is connected to the regulating circuit 1 and is configured to input an automatic gain control start-control voltage.
Optionally, the regulation circuit 1 includes a voltage drop regulation module 11 and a voltage regulation module 12. The voltage drop regulation and control module 11 is connected to the first-stage amplification circuit, the automatic gain start-control unit, and the second-stage amplification circuit, and is configured to establish a corresponding voltage drop relationship among the input terminal, the output terminal, and the voltage output terminal. The voltage regulation and control module 12 is connected with the automatic gain control unit and the voltage drop regulation and control module 11, and is used for regulating and controlling the voltage of the voltage output end according to the current and setting the automatic gain control voltage more conveniently.
Optionally, the pressure drop regulating module 11 includes a voltage dividing unit 111 and a pressure drop generating unit 112. The voltage dividing unit 111 is connected to the first stage amplifying circuit, and is used for protecting the circuit and dividing voltage. The voltage drop generating unit 112 is connected to the voltage dividing unit 111, the voltage regulating module 12, and the automatic gain start-control unit, and is configured to establish a corresponding voltage drop relationship among the input terminal, the output terminal, and the voltage output terminal.
Optionally, the voltage regulation module 12 includes a voltage regulation unit. The voltage regulating unit is connected to the second compensation unit 32 and the voltage drop generation unit 112, and is configured to increase a voltage at a connection point between the second compensation unit 32 and the voltage drop generation unit 112 according to the current.
In this embodiment, the voltage dividing unit 111 includes a first resistor R1, the voltage drop generating unit 112 includes a first diode D1 and a second diode D2, one end of the first resistor R1 is connected to the first-stage amplifying circuit, the other end of the first resistor R1 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the second diode D2 and the second-stage amplifying circuit, and the cathode of the second diode D2 is connected to the voltage regulating unit and the automatic gain start-control unit.
In the present embodiment, the automatic gain start-up control unit includes an operational amplifier U1, and the voltage regulation unit includes a second resistor R2. The output end of the operational amplifier U1 is connected with the cathode of the second resistor R2 and the cathode of the second diode D2, the negative input end of the operational amplifier U1 is connected with the output end of the operational amplifier U1, and the positive input end of the operational amplifier U1 is used for connecting the automatic gain control start-control voltage. One end of the second resistor R2 is grounded, and the other end of the second resistor R2 is connected to the cathode of the second diode D2.
Example 3
Referring to fig. 2, the difference between this embodiment and embodiment 2 is that a compensation module 3 is coupled between the voltage output terminal of the agc circuit 2 and the voltage regulation and control module 12 and the voltage drop regulation and control module 11, and is used for compensating voltage fluctuation generated before the voltage drop regulation and control module 11 enters a steady state.
Specifically, the compensation module 3 is electrically connected between a connection point of the second resistor R2 and the cathode of the second diode D2 and the output end of the operational amplifier U1.
Optionally, the compensation module 3 comprises a first compensation unit 31 and a second compensation unit 32. The first compensation unit 31 is connected with the voltage output end of the automatic gain start-control circuit 2, and is used for dividing voltage and enabling the voltage division parameter of the compensation module 3 to be consistent with the voltage division parameter of the voltage division unit 111; the second compensation unit 32 is connected to the first compensation unit 31, the voltage drop control module 11, and the voltage control module 12, and is configured to compensate for voltage fluctuation generated before the voltage drop control module 11 enters a steady state.
In this embodiment, the first compensation unit 31 includes a third resistor R3, the second compensation unit 32 includes a third diode D3 and a fourth diode D4, one end of the third resistor R3 is connected to the output end and the negative input end of the operational amplifier U1, the other end of the third resistor R3 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the cathode of the second diode D2 and the end of the second resistor R2 far from the ground. The parameters of the third diode D3, the fourth diode D4 and the third resistor R3 are consistent with the parameters of the first diode D1, the second diode D2 and the first resistor R1, the current of the compensation circuit gradually rises along with the conduction of the diodes, and the rising trend of the current is consistent with the voltage falling trend of the cathode point of the second diode D2 caused by the first diode D1 and the second diode D2.
Example 4
Referring to fig. 5, the difference between this embodiment and embodiment 3 is that the voltage regulation unit employs a potentiometer RP1, a slider of the potentiometer RP1 is connected to a cathode of the second diode D2 and a cathode of the third diode D3, one end of the potentiometer RP1 is connected to a cathode of the second diode D2 and a cathode of the third diode D3, and the other end of the potentiometer RP1 is grounded.
Example 5
The embodiment of the application discloses photoelectric sensing ranging system. A photoelectric sensing distance measurement system comprises any one of the open-loop automatic gain control circuits for the photoelectric sensing distance measurement system and an open-loop automatic gain control method for the photoelectric sensing distance measurement system.
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules, so as to perform all or part of the above described functions.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. An open-loop automatic gain control method for a photoelectric sensing distance measuring system is characterized by comprising the following steps:
acquiring a direct current level and a signal amplitude from a first-stage amplifying circuit of a photoelectric sensing distance measuring system;
determining an automatic gain control start-control voltage; the automatic gain control starting control voltage is determined by calculation according to the direct current level and the signal amplitude of the first-stage amplifying circuit;
adjusting the control depth of automatic gain control based on the automatic gain control start-up voltage, and performing automatic gain control according to the direct current level and the signal amplitude to generate an attenuated first-stage output signal; the attenuation of the attenuated first-stage output signal is increased along with the increase of the signal amplitude;
transmitting the attenuated first-stage output signal to a second-stage amplifying circuit; the value of the attenuated first-stage output signal amplified by the second-stage amplifying circuit can correspond to a longer measuring distance in a preset range.
2. The open-loop automatic gain control method for the electro-optical sensing ranging system as claimed in claim 1, wherein: the determining of the automatic gain control start-up voltage further comprises:
before the circuit enters a steady state, the output information of the first-stage amplifying circuit is subjected to voltage compensation, and the voltage compensation is used for reducing the amplitude change of the output signal of the first-stage amplifying circuit.
3. An open loop automatic gain control circuit for a photo-electric sensing distance measuring system, comprising:
the regulating and controlling circuit (1) comprises an access end, an output end and a grounding end, wherein the access end is used for being connected with a first-stage amplifying circuit in the photoelectric sensing distance measuring system and receiving a direct current and a signal amplitude from the first-stage amplifying circuit, the output end is used for being connected with a second-stage amplifying circuit in the photoelectric sensing distance measuring system and transmitting an attenuated first-stage output signal to the second-stage amplifying circuit, and the grounding end is grounded;
the automatic gain control circuit (2) comprises a voltage output end and a voltage input end, wherein the voltage input end is used for accessing automatic gain control voltage, and the voltage input end is connected with the regulating circuit (1) and used for outputting voltage to the regulating circuit (1).
4. The open-loop automatic gain control circuit for an electro-optical sensing ranging system of claim 3, wherein: the regulation circuit (1) comprises:
the voltage drop regulation and control module (11) is connected with the first-stage amplification circuit, the automatic gain start-control circuit (2) and the second-stage amplification circuit and is used for establishing corresponding voltage drop relations among the access end, the output end and the voltage output end on voltage values;
and the voltage regulation and control module (12) is connected with the automatic gain control starting circuit (2) and the voltage drop regulation and control module (11), is used for regulating and controlling the voltage of the voltage output end according to the current and is more convenient for setting the automatic gain control starting and control voltage.
5. The open-loop automatic gain control circuit for an electro-optical sensing ranging system of claim 4, wherein: the pressure drop regulation module (11) comprises:
the voltage division unit (111) is connected with the first-stage amplification circuit and used for protecting the circuit and realizing voltage division;
and the voltage drop generating unit (112) is connected with the voltage dividing unit (111), the voltage regulating and controlling module (12) and the automatic gain starting and controlling circuit (2) and is used for establishing a corresponding voltage drop relation among the access end, the output end and the voltage output end on a voltage value.
6. The open-loop automatic gain control circuit for an electro-optical sensing ranging system of claim 5, wherein: the voltage division unit (111) comprises a first resistor R1, the voltage drop generation unit (112) comprises a first diode D1 and a second diode D2, one end of the first resistor R1 is connected to the first-stage amplification circuit, the other end of the first resistor R1 is connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with the anode of the second diode D2 and the second-stage amplification circuit, and the cathode of the second diode D2 is connected with the voltage regulation module (12) and the automatic gain start-up control circuit (2).
7. The open-loop automatic gain control circuit for an electro-optical sensing ranging system of claim 6, wherein: and a compensation module (3) is coupled between the voltage output end of the automatic gain start-control circuit (2) and the voltage regulation and control module (12) and the voltage drop regulation and control module (11) and is used for compensating voltage fluctuation generated before the voltage drop regulation and control module (11) enters a steady state.
8. The open-loop automatic gain control circuit for an electro-optical sensing ranging system of claim 7, wherein: the compensation module (3) comprises:
the first compensation unit (31) is connected with the voltage output end of the automatic gain start-control circuit (2) and is used for dividing voltage and enabling the voltage division parameter of the compensation module (3) to be consistent with the voltage division parameter of the voltage division unit (111);
and the second compensation unit (32) is connected with the first compensation unit (31), the voltage drop regulation and control module (11) and the voltage regulation and control module (12) and is used for compensating voltage fluctuation generated before the voltage drop regulation and control module (11) enters a steady state.
9. The open-loop automatic gain control circuit for an electro-optical sensing ranging system of claim 8, wherein: the first compensation unit (31) comprises a third resistor R3, the second compensation unit (32) comprises a third diode D3 and a fourth diode D4, one end of the third resistor R3 is connected to the voltage output end of the automatic gain start-up control circuit (2), the other end of the third resistor R3 is connected with the anode of a fourth diode D4, the cathode of the fourth diode D4 is connected with the anode of a third diode D3, and the cathode of the third diode D3 is connected with the cathode of a second diode D2 and the voltage regulation module (12);
the voltage regulation module (12) comprises:
the voltage regulation and control unit is connected with the second compensation unit (32) and the voltage drop generation unit (112) and is used for increasing the voltage of a connection point between the second compensation unit (32) and the voltage drop generation unit (112) according to the current;
the voltage regulation and control unit adopts a second resistor R2, one end of the second resistor R2 is connected with the cathode of a second diode D2 and the cathode of a third diode D3, and the other end of the second resistor R2 is grounded; or the voltage regulation and control unit adopts a potentiometer RP1, a slide sheet of the potentiometer RP1 is connected with a cathode of the second diode D2 and a cathode of the third diode D3, one end of the potentiometer RP1 is connected with a cathode of the second diode D2 and a cathode of the third diode D3, and the other end of the potentiometer RP1 is grounded.
10. A photoelectric sensing distance measuring system is characterized in that: comprising an open loop automatic gain control circuit for an electro-optical sensing ranging system as claimed in any of the claims 3-9.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210243594.3A CN114578318A (en) | 2022-03-12 | 2022-03-12 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measuring system |
| PCT/CN2022/130911 WO2023061509A1 (en) | 2022-03-12 | 2022-11-09 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measurement system |
| JP2023501379A JP7431485B2 (en) | 2022-03-12 | 2022-11-09 | Open-loop automatic gain control method and circuit used in photoelectric sensor distance measurement system |
| KR1020237000843A KR20230134115A (en) | 2022-03-12 | 2022-11-09 | Open-loop automatic gain control method and circuit for photoelectric sensor distance measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210243594.3A CN114578318A (en) | 2022-03-12 | 2022-03-12 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measuring system |
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| Publication Number | Publication Date |
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| CN114578318A true CN114578318A (en) | 2022-06-03 |
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| CN202210243594.3A Pending CN114578318A (en) | 2022-03-12 | 2022-03-12 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measuring system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7431485B2 (en) |
| KR (1) | KR20230134115A (en) |
| CN (1) | CN114578318A (en) |
| WO (1) | WO2023061509A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023061509A1 (en) * | 2022-03-12 | 2023-04-20 | 深圳市华怡丰科技有限公司 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measurement system |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2094164U (en) | 1991-06-20 | 1992-01-22 | 北京电视技术研究所 | Agc frequency channel amplifier |
| JP2002151987A (en) | 2000-11-10 | 2002-05-24 | Nec Eng Ltd | Automatic gain control circuit |
| KR100698319B1 (en) * | 2005-02-17 | 2007-03-23 | 삼성전자주식회사 | The gain controlled amplifier and the cascoded gain controlled amplifier on the basis of it |
| CN101374021B (en) * | 2008-08-29 | 2012-12-26 | 深圳国人通信有限公司 | Synchronization control method for covering TD-SCDMA repeater station signals |
| JP5544737B2 (en) | 2009-03-26 | 2014-07-09 | 日本電気株式会社 | Radar receiver |
| JP5889152B2 (en) | 2012-09-20 | 2016-03-22 | オムロンオートモーティブエレクトロニクス株式会社 | Light receiving circuit, laser radar |
| CN112782670A (en) | 2020-12-30 | 2021-05-11 | 中国科学院微电子研究所 | Small signal amplification circuit and chip suitable for laser radar simulation front end |
| CN113193839B (en) * | 2021-04-08 | 2022-10-04 | 成都蕊感微电子有限公司 | Signal receiving and amplifying circuit and sensor |
| CN113507270B (en) * | 2021-06-23 | 2024-04-19 | 深圳市傲科光电子有限公司 | Variable gain amplifier |
| CN114141098A (en) * | 2021-12-03 | 2022-03-04 | 中国人民解放军空军预警学院 | Radar performance parameter test training and checking system |
| CN114578318A (en) * | 2022-03-12 | 2022-06-03 | 深圳市华怡丰科技有限公司 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measuring system |
-
2022
- 2022-03-12 CN CN202210243594.3A patent/CN114578318A/en active Pending
- 2022-11-09 WO PCT/CN2022/130911 patent/WO2023061509A1/en active Application Filing
- 2022-11-09 JP JP2023501379A patent/JP7431485B2/en active Active
- 2022-11-09 KR KR1020237000843A patent/KR20230134115A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023061509A1 (en) * | 2022-03-12 | 2023-04-20 | 深圳市华怡丰科技有限公司 | Open-loop automatic gain control method and circuit for photoelectric sensing distance measurement system |
Also Published As
| Publication number | Publication date |
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| JP7431485B2 (en) | 2024-02-15 |
| JP2023545598A (en) | 2023-10-31 |
| WO2023061509A1 (en) | 2023-04-20 |
| KR20230134115A (en) | 2023-09-20 |
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