CN118100894B - Anti-interference photoelectric sensor driving circuit and control method - Google Patents
Anti-interference photoelectric sensor driving circuit and control method Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
- H03K17/7955—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors using phototransistors
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The application relates to the technical field of photoelectric switches, in particular to an anti-interference photoelectric sensor driving circuit and a control method. The application has the effect of improving the light interference resistance reliability and the light interference resistance performance of the photoelectric switch.
Description
Technical Field
The invention relates to the technical field of photoelectric switches, in particular to an anti-interference photoelectric sensor driving circuit and a control method.
Background
Optoelectronic switches are a common type of electronic device that enable the switching control of an electrical circuit by the presence or absence of an optical signal. The photoelectric switch is widely applied to the technology, for example, in an industrial automation control system, the photoelectric switch is applied to a production line for detecting the in-place, counting, positioning and the like of objects, and the photoelectric switch triggers corresponding control signals by sensing the existence or absence of light rays so as to realize automatic production and control.
At present, in the application of the photoelectric switch in the industrial environment, the photoelectric switch is often interfered by background light, such as strong light, stray light and the like, and the background light easily causes unstable work of the photoelectric switch, so that misjudgment or missed judgment of the photoelectric switch occurs, the reliability and the accuracy of the photoelectric switch are reduced, the conventional method is to reform the photoelectric switch in terms of structure, and to match with an optical lens by using a complex structure, so as to avoid the interference of light irradiation on the photoelectric switch, or to carry out independent threshold values on the threshold values of the photoelectric switch in different illumination environments, but the reconstruction of the anti-light interference of the conventional photoelectric switch greatly increases the manufacturing cost and the use cost of the photoelectric switch and the labor cost of maintenance, so that a certain improvement space exists.
Disclosure of Invention
In order to improve the anti-light interference reliability of the photoelectric switch and the anti-light interference performance of the photoelectric switch, the application provides an anti-interference photoelectric sensor driving circuit and a control method.
In a first aspect, the present application provides an anti-interference driving circuit for a photoelectric sensor, which adopts the following technical scheme:
The utility model provides an anti-interference photoelectric sensor drive circuit, includes wave form signal generation module, optical signal processing module, photoelectric switch module and drive module, wave form signal generation module couples in photoelectric switch module's input, wave form signal generation module is used for controlling to give photoelectric switch module power supply, photoelectric switch module's output is coupled in optical signal processing module's input, optical signal processing module's output is coupled in drive module, photoelectric switch module is used for outputting fixed frequency's optical signal to optical signal processing module, optical signal processing module is used for receiving and handling fixed frequency's optical signal and ambient light signal to output signal processing result to drive module, drive module couples in drive terminal to output drive signal to drive terminal according to signal processing result.
By adopting the technical scheme, in the use process of the photoelectric switch, the waveform signal generating module is used for controlling the photoelectric switch module to supply power to the photoelectric switch module, so that the photoelectric switch module outputs optical signals with fixed frequency to the optical signal processing module, meanwhile, sunlight in the use environment of the photoelectric switch irradiates the photoelectric switch to form an environment optical signal, the optical signal processing module receives the optical signals with fixed frequency and the environment optical signal, and performs signal processing on the optical signals with fixed frequency and the environment optical signal, direct current signals generated by the two optical signals are distinguished, the signal processing result is output to the driving module, the driving module outputs driving signals to all driving terminals according to the signal nursing result, so that the starting and stopping of the driving terminals are controlled, and the whole photoelectric switch control process does not influence the output result of the photoelectric switch even if the environment light generates direct current signals with different amplitudes to the photoelectric switch under the condition of not modifying equipment and the structure of the photoelectric switch, thereby achieving the anti-interference purpose, and improving the anti-optical interference reliability of the photoelectric switch and the anti-optical interference performance of the photoelectric switch.
Preferably, the waveform signal generating module includes a first comparator U1, a first resistor R1 and a first capacitor C1, where the first resistor R1 and the first capacitor C1 are connected in series, the other end of the first resistor R1 is coupled to a power supply, a connection node of the first resistor R1 and the first capacitor C1 is coupled to a first input end of the first comparator U1, the other end of the first capacitor C1 is grounded, the first comparator U1 further includes a second input end, the second input end of the first comparator U1 is coupled to a second resistor R2 and a third resistor R3, the second resistor R2 and the third resistor R3 are connected in series, a connection node of the second resistor R2 and the third resistor R3 is electrically connected to a second input end of the first comparator U1, a connection node of the second resistor R2 and the third resistor R3 is connected in series to a fourth resistor R4 and then is coupled to an output end of the first comparator U1, and the first comparator U1 is coupled to the optoelectronic module.
By adopting the technical scheme, the first input end of the first comparator U1 receives the voltage of the first resistor R1 and the first capacitor C1, the second input end of the first comparator U1 receives the voltage between the second resistor R2 and the third resistor R3, the second resistor R2, the third resistor R3 and the fourth resistor R3 jointly form a hysteresis circuit, the resistance value of the first resistor R1, the time constant of the first capacitor C1 and the second resistor R2, the third resistor R3 and the fourth resistor R3 jointly form a hysteresis circuit to determine the frequency of the waveform signals output by the output end of the first comparator U1, and the output end of the first comparator U1 outputs the waveform signals with different frequencies to the photoelectric switch module, so that the photoelectric switch module is controlled to receive the waveform signals with different frequencies, and the optical signals with different frequencies are conveniently generated.
Preferably, the photoelectric switch module includes a triode Q1 and a photoelectric switch Q2, a base electrode of the triode Q1 is coupled to an output end of the first comparator U1, a collector electrode of the triode Q1 is coupled to a power supply, an emitter electrode of the triode Q1 is serially connected with a sixth resistor R6 and then is coupled to the photoelectric switch Q2, the photoelectric switch Q2 includes a light emitting LED and a phototransistor, an anode of the light emitting LED is coupled to the other end of the sixth resistor R6, a cathode of the light emitting LED is grounded, the phototransistor is coupled to the light emitting LED, a collector electrode of the phototransistor is serially connected with a seventh resistor R7 and then is coupled to the power supply, an emitter electrode of the phototransistor is grounded, and a connection node between the phototransistor and the seventh resistor R7 is coupled to the optical signal processing module.
By adopting the technical scheme, when the photoelectric switch module receives the waveform voltages with different frequencies output by the waveform signal generating module, the voltage of the base electrode of the triode Q1 is changed, so that the triode Q1 is in a conducting state or a disconnecting state, when the triode Q1 is in a conducting state, the light emitting LED of the photoelectric switch Q2 is electrified to emit light signals, the light receiving diode of the photoelectric switch receives the light signals emitted by the light emitting LED to be in a conducting state, and then the photoelectric switch module outputs the light signals with fixed frequency to the light signal processing module; when the triode Q1 is in an off state, the light-emitting LED of the photoelectric switch Q2 is powered off, no light signal is output, the phototriode is in an off state, and the photoelectric switch module does not have light signal output, so that the function of controlling whether fixed frequency light signal output exists or not is realized.
Preferably, the optical signal processing module includes a second comparator U2 and a third comparator U3, where a first input end of the second comparator U2 is connected in series with an eighth resistor R8 and then coupled to an output end of the optoelectronic switch module, a second input end of the second comparator U2 is connected in series with a ninth resistor R9 and then coupled to an output end of the optoelectronic switch module, connection nodes of the ninth resistor R9 and the second input end of the second comparator U2 are respectively coupled with a tenth resistor R10 and a second capacitor C2, an output end of the second comparator U2 is connected in series with a twelfth resistor R12 and then coupled to a second input end of the third comparator U3, a first input end of the third comparator U3 is respectively coupled with a fourteenth resistor R14 and a fifteenth resistor R15, connection nodes of the fourteenth resistor R14 and the fifteenth resistor R15 are connected in series, a connection node of the thirteenth resistor R14 and the fifteenth resistor R15 is coupled to the third comparator U3, a thirteenth node is connected in parallel with a thirteenth resistor R13, another node is connected with a thirteenth resistor R13, and another node is connected with a thirteenth resistor R13.
By adopting the technical scheme, when the optical signal processing module receives the optical signal with fixed frequency and the ambient optical signal output by the photoelectric switch module, the optical signal output by the photoelectric switch module continuously charges and discharges the second capacitor C2, so that the output end of the second comparator U2 outputs a voltage signal with reverse fixed frequency, the voltage signal with reverse fixed frequency output by the output end of the second comparator U2 continuously charges the third capacitor C3, and further, the input voltage of the second input end of the third comparator U3 is maintained to be higher than the input voltage of the first input end of the third comparator U3, and the output end output of the third comparator U3 continuously outputs a high level; when the optical signal processing module does not receive the optical signal output by the photoelectric switch module, the optical signal processing module only receives the ambient optical signal, the voltage of the second input end of the second comparator U2 is lower than the voltage of the first input end of the second comparator U2 through the voltage division of the tenth resistor R10, the output end of the second comparator U2 outputs a fixed low level, the third capacitor C3 discharges to the ground through the twelfth resistor R12, so that the voltage of the second input end of the third comparator U3 is smaller than the voltage of the first input end of the third comparator U3, the output end of the third comparator U3 continuously outputs a low level, and the functions of receiving and processing the optical signal with the fixed frequency and the ambient optical signal are realized, and the signal processing result is output.
In a second aspect, the present application provides an anti-interference driving control method for a photoelectric sensor, which adopts the following technical scheme:
the anti-interference photoelectric sensor driving control method comprises the following steps:
Acquiring the ambient illumination intensity received by a current photoelectric switch, and generating an ambient light brightness value based on the ambient illumination intensity;
Acquiring a self light brightness value of a photoelectric switch, and converting the self light brightness value and an ambient light brightness value of the photoelectric switch into a photoelectric output signal based on the self light brightness value and the ambient light brightness value of the photoelectric switch;
obtaining a driving output voltage result according to the photoelectric output signal, wherein the driving output voltage result comprises a low-level output voltage result and a high-level output voltage result;
And generating a driving control command based on the driving output voltage result, and controlling each driving terminal to start or stop in response to the driving control command.
By adopting the technical scheme, in the working process of the photoelectric switch, the photoelectric switch is easy to receive the illumination of external environment light, the environment light intensity received by the photoelectric switch is utilized to fit the environment light intensity value under the environment, the self light intensity value generated in the working process of the photoelectric switch is obtained in real time, the light signal processing module converts the self light intensity value of the photoelectric switch and the environment light intensity value into the photoelectric output signal and carries out signal processing, the driving output voltage result output by the photoelectric switch is obtained according to the converted photoelectric output signal, wherein the driving output voltage result comprises a low-level output voltage result and a high-level output voltage result, a corresponding driving control instruction is generated according to the driving output voltage result, the driving control instruction is responded, the photoelectric switch controls the starting or stopping of each driving terminal, and the whole photoelectric switch control process does not influence the output result of the photoelectric switch even if the environment light generates direct current signals with different amplitudes for the photoelectric switch under the condition of not modifying equipment and the self structure of the photoelectric switch, thereby achieving the anti-interference purpose, and improving the anti-light interference reliability of the photoelectric switch and the anti-light interference performance of the photoelectric switch.
The present application may be further configured in a preferred example to: the method for obtaining the ambient illumination intensity received by the current photoelectric switch, and generating the ambient light brightness value based on the ambient illumination intensity specifically comprises the following steps:
Acquiring illumination intensity of visible light and illumination intensity of infrared light of the current environment;
and acquiring the ambient light brightness value based on a preset multi-illumination intensity fitting formula according to the illumination intensity of the visible light and the illumination intensity of the infrared light.
Through adopting above-mentioned technical scheme, when the control of analysis ambient light to photoelectric switch influences, the ambient light around has the various circumstances of type, only adjust photoelectric switch's output control according to the illumination intensity of visible light, can lead to photoelectric switch's output control to adjust unreasonable condition, consequently, through obtaining the visible light illumination intensity under the current ambient light and infrared light illumination intensity, utilize the multiple illumination intensity fitting formula of predetermineeing, with visible light illumination intensity and infrared light illumination intensity as the basis, the fitting calculates current ambient light luminance value, can effectively avoid photoelectric switch's output control adjustment error great condition.
The present application may be further configured in a preferred example to: the method for obtaining the ambient light brightness value based on the preset multi-illumination intensity fitting formula according to the illumination intensity of the visible light and the illumination intensity of the infrared light specifically comprises the following steps:
Respectively bringing the illumination intensity of the visible light and the illumination intensity of the infrared light into the multi-illumination intensity fitting formula to obtain a plurality of environment light brightness values calculated by the multi-illumination intensity fitting formula;
and obtaining the reference ambient light brightness value based on an average value of the plurality of ambient light brightness values.
By adopting the technical scheme, the illumination intensity value of the visible light and the illumination intensity value of the infrared light are utilized to calculate a plurality of environment light brightness values through the multi-illumination intensity fitting formula, the calculated environment light brightness values are subjected to average calculation to obtain the environment light brightness values, the accurate current environment light brightness value can be obtained in the process of obtaining the current environment light, and the accuracy of the obtained current environment light signal is improved.
The present application may be further configured in a preferred example to: the obtaining the self brightness value of the photoelectric switch, converting the self brightness value and the ambient brightness value of the photoelectric switch into photoelectric output signals based on the self brightness value and the ambient brightness value of the photoelectric switch, specifically comprising:
acquiring a self brightness value of the photoelectric switch based on the working state of the photoelectric switch module;
and acquiring a preset photoelectric conversion coefficient, and calculating a photoelectric output signal based on the self brightness value, the ambient brightness value and the photoelectric conversion coefficient of the photoelectric switch.
Through adopting above-mentioned technical scheme, obtain corresponding photoelectric switch self luminance value through photoelectric switch module's self operating condition, when photoelectric switch module is the on-state, then photoelectric switch self luminance value is a constant, when photoelectric switch module is the off-state, then photoelectric switch self luminance value is 0, according to photoelectric switch self luminance value, ambient light luminance value and photoelectric conversion coefficient, calculate corresponding photoelectric output signal, and then realize the function that optical signal converted into the electrical signal.
In summary, the present application includes at least one of the following beneficial technical effects:
1. In the use process of the photoelectric switch, the waveform signal generating module is used for controlling the photoelectric switch module to supply power to the photoelectric switch module, so that the photoelectric switch module outputs a fixed-frequency optical signal to the optical signal processing module, meanwhile, sunlight in the use environment of the photoelectric switch irradiates the photoelectric switch to form an environment optical signal, the optical signal processing module receives the fixed-frequency optical signal and the environment optical signal which are output by the photoelectric switch module, and performs signal processing on the fixed-frequency optical signal and the environment optical signal, the direct-current signals generated by the two optical signals are distinguished, a signal processing result is output to the driving module, and the driving module outputs driving signals to each driving terminal according to a signal nursing result so as to control the start and stop of the driving terminal.
2. In the working process of the photoelectric switch, the photoelectric switch is easy to be subjected to illumination of external environment light, the ambient light intensity of the photoelectric switch is obtained, the ambient light intensity is utilized to fit the ambient light intensity value in the environment, the self light intensity value generated in the working process of the photoelectric switch is obtained in real time, the light signal processing module converts the self light intensity value of the photoelectric switch and the ambient light intensity value into a photoelectric output signal and carries out signal processing, the driving output voltage result output by the photoelectric switch is obtained according to the converted photoelectric output signal, wherein the driving output voltage result comprises a low-level output voltage result and a high-level output voltage result, a corresponding driving control instruction is generated according to the driving output voltage result, the driving control instruction is responded, the photoelectric switch controls the starting or stopping of each driving terminal, and the whole photoelectric switch control process does not influence the output result of the photoelectric switch under the condition that equipment and the photoelectric switch are not refitted, even if the ambient light generates direct current signals with different amplitudes, thereby achieving the anti-interference purpose, and improving the anti-light interference reliability of the photoelectric switch and the anti-light interference performance of the photoelectric switch;
3. When the control influence of the ambient light on the photoelectric switch is analyzed, the ambient light has various conditions, and the output control of the photoelectric switch is regulated only according to the illumination intensity of the visible light, so that the unreasonable regulation of the output control of the photoelectric switch can be caused, therefore, the current ambient light brightness value is calculated by fitting by utilizing a preset multi-illumination intensity fitting formula based on the visible light illumination intensity and the infrared light illumination intensity by acquiring the visible light illumination intensity and the infrared light illumination intensity under the current ambient light, and the condition that the regulation error of the output control of the photoelectric switch is larger can be effectively avoided;
4. According to the multi-illumination intensity fitting formula, the obtained illumination intensity value of visible light and the obtained illumination intensity value of infrared light are utilized to calculate to obtain a plurality of ambient light brightness values, the calculated ambient light brightness values are subjected to average calculation to obtain the ambient light brightness values, the accurate current ambient light brightness value can be obtained in the process of obtaining the current ambient light, and the accuracy of the obtained current ambient light signal is improved.
Drawings
Fig. 1 is a block diagram of a driving circuit of an anti-interference photoelectric sensor according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a waveform signal generating module of an anti-interference driving circuit of a photoelectric sensor according to an embodiment of the present application.
Fig. 3 is a circuit diagram of a photoelectric switch module of an anti-interference photoelectric sensor driving circuit according to an embodiment of the present application.
Fig. 4 is a circuit diagram of an optical signal processing module of an anti-interference driving circuit of a photoelectric sensor according to an embodiment of the present application.
FIG. 5 is a flow chart of an embodiment of a method for driving an anti-tamper photosensor according to the present application.
Fig. 6 is a flowchart of an implementation of step S10 in an anti-interference driving method of a photoelectric sensor according to the present application.
Fig. 7 is a flowchart of the implementation of step S12 in the anti-interference driving method of the photoelectric sensor of the present application.
Fig. 8 is a flowchart of an implementation of step S20 in an anti-interference driving method of a photoelectric sensor according to the present application.
Reference numerals illustrate: 1. a waveform signal generation module; 2. an optoelectronic switch module; 3. and an optical signal processing module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to fig. 1 to 7.
In an embodiment, referring to fig. 1, an anti-interference driving circuit for a photoelectric sensor includes a waveform signal generating module 1, an optical signal processing module 3, a photoelectric switch module 2 and a driving module, where the waveform signal generating module 1 is coupled to an input end of the photoelectric switch module 2, the waveform signal generating module 1 is used for controlling power supply to the photoelectric switch module 2, an output end of the photoelectric switch module 2 is coupled to an input end of the optical signal processing module 3, an output end of the optical signal processing module 3 is coupled to the driving module, the photoelectric switch module 2 is used for outputting an optical signal with a fixed frequency to the optical signal processing module 3, the optical signal processing module 3 is used for receiving and processing the optical signal with the fixed frequency and an ambient light signal to output a signal processing result to the driving module, and the driving module is coupled to the driving terminal to output the driving signal to the driving terminal according to the signal processing result.
Referring to fig. 2, the waveform signal generating module 1 includes a first comparator U1, a first resistor R1 and a first capacitor C1, wherein a first input terminal of the first comparator U1 is an inverting input terminal, a second input terminal of the first comparator U1 is a positive input terminal, the first comparator U1 includes eight pins, a first pin of the first comparator U1 is an output terminal, a second pin of the first comparator U1 is an inverting input terminal, a third pin of the first comparator U1 is a positive input terminal, a first resistor R1 and a first capacitor C1 are connected in series, the other end of the first resistor R1 is coupled to the inverting input terminal of the first comparator U1, the other end of the first capacitor C1 is grounded, the first comparator U1 further includes a positive input terminal, the positive input terminal of the first comparator U1 is coupled to a second resistor R2 and a third resistor R3, the second resistor R2 and the third resistor R3 are connected to the inverting input terminal of the first comparator U1, the other end of the first resistor R1 is coupled to the fifth resistor R1, the other end of the first resistor is coupled to the fifth resistor U1 is coupled to the output terminal of the first comparator U1, the fourth resistor R2 is coupled to the output terminal of the fourth resistor R1 is coupled to the fifth resistor R1, and the other end of the fifth resistor is coupled to the output terminal of the fourth resistor R1 is coupled to the fourth resistor R1.
Specifically, the first input end of the first comparator U1 receives the voltages of the first resistor R1 and the first capacitor C1, the second input end of the first comparator U1 receives the voltages between the second resistor R2 and the third resistor R3, the second resistor R2, the third resistor R3 and the fourth resistor R3 together form a hysteresis circuit, the resistance value of the first resistor R1, the time constant of the first capacitor C1 and the second resistor R2, the third resistor R3 and the fourth resistor R3 together form a hysteresis circuit to determine the frequency of the waveform signal output by the output end of the first comparator U1, the output end of the first comparator U1 outputs waveform signals with different frequencies to the photoelectric switch module 2, so as to control the photoelectric switch module 2 to receive waveform signals with different frequencies, for example, the waveforms of R1, R2, R3 and R4 are controlled to take 100kΩ, the waveform of R5 takes 10kΩ, and the waveform of C1 takes 10nF, and the output end of the first comparator U1 can output signals with the frequency of about 720 hz.
Referring to fig. 3, the photoelectric switch module 2 includes a triode Q1 and a photoelectric switch Q2, a base electrode of the triode Q1 is coupled to an output end of the first comparator U1, a collector electrode of the triode Q1 is coupled to a power supply, an emitter electrode of the triode Q1 is connected in series with a sixth resistor R6 and then coupled to the photoelectric switch Q2, the photoelectric switch Q2 includes a light emitting LED and a phototransistor, an anode of the light emitting LED is coupled to the other end of the sixth resistor R6, a cathode of the light emitting LED is grounded, the phototransistor is coupled to the light emitting LED, a collector electrode of the phototransistor is connected in series with a seventh resistor R7 and then coupled to the power supply, an emitter electrode of the phototransistor is grounded, and a connection node of the phototransistor and the seventh resistor R7 is coupled to the optical signal processing module 3.
Specifically, when the photoelectric switch module 2 receives the waveform voltages with different frequencies output by the waveform signal generating module 1, the voltage of the base electrode of the triode Q1 is changed, so that the triode Q1 is in a conducting state or a disconnecting state, when the triode Q1 is in a conducting state, the light emitting LED of the photoelectric switch Q2 is electrified to emit a light signal, the photo-transistor receiver receives the light signal emitted by the light emitting LED to be in a conducting state, and then the photoelectric switch module 2 outputs the light signal with fixed frequency to the light signal processing module 3; when the triode Q1 is in an off state, the light-emitting LED of the photoelectric switch Q2 is powered off, no light signal is output, the phototriode is in an off state, and the photoelectric switch module 2 does not have light signal output.
Referring to fig. 4, the optical signal processing module 3 includes a second comparator U2 and a third comparator U3, wherein the first input end of the second comparator U2 and the first input end of the third comparator U3 are both inverting input ends, the second input end of the second comparator U2 and the second input end of the third comparator U3 are both non-inverting input ends, the second comparator U2 and the third comparator U3 both include eight pins, the first pin of the second comparator U2 is an output end, the second pin of the second comparator U2 is an inverting input end, the third pin of the second comparator U2 is a non-inverting input end, the seventh pin of the third comparator U3 is an output end, the fifth pin of the third comparator U3 is an inverting input end, the sixth pin of the third comparator U3 is a non-inverting input end, the inverting input end of the second comparator U2 is serially connected with an eighth resistor R8 and then coupled to the output end of the switch module 2, the positive input end of the second comparator U2 is connected in series with a ninth resistor R9 and then is coupled to the output end of the photoelectric switch module 2, the eighth pin of the second comparator U2 is coupled to a power supply, the fourth pin of the second comparator U2 is grounded, the connection nodes of the positive input ends of the ninth resistor R9 and the second comparator U2 are respectively coupled with a tenth resistor R10 and a second capacitor C2, the output end of the second comparator U2 is coupled with an eleventh resistor R11, the other end of the eleventh resistor R11 is coupled to the power supply, the output end of the second comparator U2 is also connected in series with a twelfth resistor R12 and then is coupled to the positive input end of the third comparator U3, the inverting input end of the third comparator U3 is respectively coupled with a fourteenth resistor R14 and a fifteenth resistor R15, the connection nodes of the fourteenth resistor R14 and the fifteenth resistor R15 are coupled to the inverting input end of the third comparator U3 in series, the other end of the fourteenth resistor R14 is coupled to the power supply, the other end of the fifteenth resistor R15 is grounded, the eighth pin of the third comparator U3 is coupled to the power supply, the fourth pin of the third comparator U3 is grounded, the connection nodes of the third comparator U3 and the twelfth resistor R12 are respectively coupled to the thirteenth resistor R13 and the third capacitor C3, the thirteenth resistor R13 is connected in parallel to the third capacitor C3, the connection node of the thirteenth resistor R13 and the third capacitor C3 is grounded, the output end of the third comparator U3 is coupled to the driving module, the output end of the third comparator U3 is further coupled to the sixteenth resistor R16, and the other end of the sixteenth resistor R16 is coupled to the power supply.
Specifically, when the optical signal processing module 3 receives the optical signal with the fixed frequency and the ambient optical signal output by the optical switch module 2, the optical signal output by the optical switch module 2 continuously charges and discharges the second capacitor C2, so that the output end of the second comparator U2 outputs a voltage signal with the fixed frequency in the opposite direction, the voltage signal with the fixed frequency output by the output end of the second comparator U2 continuously charges the third capacitor C3, and further, the input voltage of the second input end of the third comparator U3 is maintained to be higher than the input voltage of the first input end of the third comparator U3, so that the output end of the third comparator U3 continuously outputs a high level; when the optical signal processing module 3 does not receive the optical signal output by the optical switch module 2, the optical signal processing module 3 only receives the ambient optical signal, the voltage of the second input end of the second comparator U2 is lower than the voltage of the first input end of the second comparator U2 through the voltage division of the tenth resistor R10, the output end of the second comparator U2 outputs a fixed low level, the third capacitor C3 discharges to the ground through the twelfth resistor R12, so that the voltage of the second input end of the third comparator U3 is lower than the voltage of the first input end of the third comparator U3, the output end of the third comparator U3 continuously outputs a low level, and the functions of receiving and processing the optical signal with the fixed frequency and the ambient optical signal are realized to output a signal processing result.
The implementation principle of the anti-interference photoelectric sensor driving circuit provided by the embodiment of the application is as follows: in the use process of the photoelectric switch, the waveform signal generating module 1 is used for controlling the photoelectric switch module 2 to supply power, so that the photoelectric switch module 2 outputs optical signals with fixed frequency to the optical signal processing module 3, meanwhile, sunlight in the use environment of the photoelectric switch irradiates the photoelectric switch to form environment optical signals, the optical signal processing module 3 receives the optical signals with fixed frequency and the environment optical signals which are output by the photoelectric switch module 2, and performs signal processing on the optical signals with fixed frequency and the environment optical signals, direct current signals generated by the two optical signals are distinguished, signal processing results are output to the driving module, and the driving module outputs driving signals to each driving terminal according to signal nursing results so as to control the start and stop of the driving terminal.
In an embodiment, as shown in fig. 5, the application further discloses a photoelectric switch adjustment control method of the anti-interference photoelectric sensor driving circuit, and the anti-interference photoelectric sensor driving control method specifically comprises the following steps:
S10: and acquiring the ambient illumination intensity received by the current photoelectric switch, and generating an ambient light brightness value based on the ambient illumination intensity.
Specifically, in the working process of the photoelectric switch, the photoelectric switch is easy to be subjected to illumination of external environment light, and the ambient light intensity under the environment is fitted by utilizing the ambient light intensity by acquiring the ambient light intensity received by the photoelectric switch.
S20: and acquiring the self brightness value of the photoelectric switch, and converting the self brightness value and the ambient brightness value of the photoelectric switch into photoelectric output signals based on the self brightness value and the ambient brightness value of the photoelectric switch.
Specifically, the self brightness value generated in the working process of the photoelectric switch is obtained in real time, and the optical signal processing module converts the self brightness value and the ambient brightness value of the photoelectric switch into a photoelectric output signal.
S30: and obtaining a driving output voltage result according to the photoelectric output signal, wherein the driving output voltage result comprises a low-level output voltage result and a high-level output voltage result.
Specifically, the photoelectric switch performs signal processing on the received optical signal, and obtains a driving output voltage result output by the photoelectric switch according to the converted photoelectric output signal, wherein the driving output voltage result comprises a low-level output voltage result and a high-level output voltage result.
S40: and generating a driving control command based on the driving output voltage result, and controlling each driving terminal to start or stop in response to the driving control command.
Specifically, a corresponding driving control command is generated according to a driving output voltage result, the driving control command is responded, the photoelectric switch controls the starting or stopping of each driving terminal, and under the condition that equipment and the structure of the photoelectric switch are not refitted, even if the environment light generates direct current signals with different amplitudes for the photoelectric switch, the output result of the photoelectric switch is not influenced, so that the anti-interference purpose is achieved, and the anti-optical interference reliability of the photoelectric switch and the anti-optical interference performance of the photoelectric switch are improved.
In this embodiment, during the working process of the photoelectric switch, the photoelectric switch is easily illuminated by external ambient light, the ambient light intensity is used to fit the ambient light intensity of the environment, the self light intensity value generated during the working process of the photoelectric switch is obtained in real time, the optical signal processing module converts the self light intensity value of the photoelectric switch and the ambient light intensity value into a photoelectric output signal according to the self light intensity value of the photoelectric switch, and performs signal processing, and obtains the driving output voltage result output by the photoelectric switch according to the converted photoelectric output signal, wherein the driving output voltage result comprises a low level output voltage result and a high level output voltage result, a corresponding driving control instruction is generated according to the driving output voltage result, and the photoelectric switch controls the starting or stopping of each driving terminal.
In one embodiment, as shown in fig. 6, in step S10, the ambient light intensity received by the current photoelectric switch is obtained, and the generating the ambient light intensity value based on the ambient light intensity specifically includes:
s11: and acquiring the illumination intensity of visible light and the illumination intensity of infrared light of the current environment.
Specifically, when the control influence of ambient light on the photoelectric switch is analyzed, various conditions exist in the ambient light, the output control of the photoelectric switch is adjusted only according to the illumination intensity of visible light, and unreasonable output control adjustment of the photoelectric switch can possibly be caused, therefore, the current ambient light brightness value is calculated by fitting by utilizing a preset multi-illumination intensity fitting formula based on the visible light illumination intensity and the infrared light illumination intensity by acquiring the visible light illumination intensity and the infrared light illumination intensity under the current ambient light, and the condition that the output control adjustment error of the photoelectric switch is large can be effectively avoided.
S12: and acquiring the ambient light brightness value based on a preset multi-illumination intensity fitting formula according to the illumination intensity of the visible light and the illumination intensity of the infrared light.
Specifically, as shown in fig. 7, in step S12, that is, according to the illumination intensity of the visible light and the illumination intensity of the infrared light, an ambient light brightness value is obtained based on a preset multi-illumination intensity fitting formula, which specifically includes:
S121: and respectively bringing the illumination intensity of the visible light and the illumination intensity of the infrared light into the multi-illumination intensity fitting formula to obtain a plurality of environment light brightness values calculated by the multi-illumination intensity fitting formula.
Specifically, a plurality of illumination intensity fitting formulas can be set first, independent variables of the plurality of illumination intensity fitting formulas are illumination intensity of visible light and illumination intensity of infrared light, dependent variables are illumination intensity of ambient light, illumination intensity of the visible light and illumination intensity of the infrared light in an ambient pipe are brought into the plurality of illumination intensity fitting formulas respectively, and a plurality of ambient light brightness values are calculated, wherein the illumination intensity fitting formulas are as follows:
Wherein, For a certain value of the ambient light level,As the illumination intensity value of the visible light,Is the illumination intensity of the infrared light,Is the ratio of infrared light to visible light in ambient light,Is the time value of the photoelectric switch under illumination.
S122: and obtaining the reference ambient light brightness value based on an average value of the plurality of ambient light brightness values.
Specifically, by using a multi-illumination intensity fitting formula, a plurality of ambient light brightness values are obtained by calculation by using the obtained illumination intensity value of visible light and the illumination intensity value of infrared light, and the calculated ambient light brightness values are subjected to average calculation to obtain the ambient light brightness value, so that an accurate current ambient light brightness value can be obtained in the process of obtaining the current ambient light, and the accuracy of the obtained current ambient light signal is improved.
In one embodiment, as shown in fig. 8, in step S20, a self-luminance value of the photoelectric switch is obtained, and the self-luminance value of the photoelectric switch and the ambient light value are converted into a photoelectric output signal based on the self-luminance value of the photoelectric switch, which specifically includes:
S21: and acquiring the self brightness value of the photoelectric switch based on the working state of the photoelectric switch module.
S22: and acquiring a preset photoelectric conversion coefficient, and calculating a photoelectric output signal based on the self brightness value, the ambient brightness value and the photoelectric conversion coefficient of the photoelectric switch.
Specifically, the self working state of the photoelectric switch module is used for obtaining the corresponding self brightness value of the photoelectric switch, when the photoelectric switch module is in a conducting state, the self brightness value of the photoelectric switch is a constant, the photoelectric switch generates an optical signal A with fixed frequency F, the sunlight in a scene is assumed to be a signal B, the photoelectric switch receives a signal C=A+B, when the photoelectric switch module is in a disconnecting state, the self brightness value of the photoelectric switch is 0, and a corresponding photoelectric output signal is calculated according to the self brightness value of the photoelectric switch, the ambient brightness value and the photoelectric conversion coefficient, and the photoelectric output signal D=C is the photoelectric conversion coefficient, so that the function of converting the optical signal into an electric signal is realized.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (5)
1. The anti-interference photoelectric sensor driving circuit is characterized by comprising a waveform signal generating module (1), an optical signal processing module (3), a photoelectric switch module (2) and a driving module, wherein the waveform signal generating module (1) is coupled to the input end of the photoelectric switch module (2), the waveform signal generating module (1) is used for supplying power to the photoelectric switch module (2), the output end of the photoelectric switch module (2) is coupled to the input end of the optical signal processing module (3), the output end of the optical signal processing module (3) is coupled to the driving module, the optical signal processing module (2) is used for outputting an optical signal with a fixed frequency to the optical signal processing module (3), the optical signal processing module (3) is used for receiving and processing the optical signal with the fixed frequency and an ambient optical signal to output a signal processing result to the driving module, and the driving module is coupled to the driving terminal to output the driving signal to the driving terminal according to the signal processing result so as to control the driving terminal to start or stop;
The waveform signal generating module (1) comprises a first comparator U1, a first resistor R1 and a first capacitor C1, wherein the first resistor R1 and the first capacitor C1 are connected in series, the other end of the first resistor R1 is coupled to a power supply, the other end of the first capacitor C1 is grounded, a connection node of the first resistor R1 and the first capacitor C1 is coupled to a first input end of the first comparator U1, the other end of the first capacitor C1 is grounded, the first comparator U1 further comprises a second input end, a second resistor R2 and a third resistor R3 are coupled to the second input end of the first comparator U1, the second resistor R2 and the third resistor R3 are connected in series, a connection node of the second resistor R2 and the third resistor R3 is electrically connected with a second input end of the first comparator U1, a connection node of the second resistor R2 and the third resistor R3 is connected in series with a fourth resistor R4 and then is coupled to the first output end of the first comparator U1, and the first comparator U1 is coupled to an output end of the switch (the switch module is coupled to the first comparator U2);
The photoelectric switch module (2) comprises a triode Q1 and a photoelectric switch Q2, wherein the base electrode of the triode Q1 is coupled to the output end of the first comparator U1, the collector electrode of the triode Q1 is coupled to a power supply, the emitter electrode of the triode Q1 is connected in series with a sixth resistor R6 and then is coupled to the photoelectric switch Q2, the photoelectric switch Q2 comprises a light emitting LED and a phototriode, the anode of the light emitting LED is coupled to the other end of the sixth resistor R6, the cathode of the light emitting LED is grounded, the phototriode is coupled to the light emitting LED, the collector electrode of the phototriode is connected in series with a seventh resistor R7 and then is coupled to the power supply, the emitter electrode of the phototriode is grounded, and the connecting node of the phototriode and the seventh resistor R7 is coupled to the light signal processing module (3);
The optical signal processing module (3) comprises a second comparator U2 and a third comparator U3, wherein a first input end of the second comparator U2 is connected in series with an eighth resistor R8 and then is coupled to an output end of the photoelectric switch module (2), a second input end of the second comparator U2 is connected in series with a ninth resistor R9 and then is coupled to an output end of the photoelectric switch module (2), a connection node of the ninth resistor R9 and the second input end of the second comparator U2 is respectively coupled with a tenth resistor R10 and a second capacitor C2, an output end of the second comparator U2 is connected in series with a twelfth resistor R12 and then is coupled to a second input end of the third comparator U3, a first input end of the third comparator U3 is respectively coupled with a fourteenth resistor R14 and a fifteenth resistor R15, a connection node of the fourteenth resistor R14 and the fifteenth resistor R15 is connected in series with each other, a connection node of the thirteenth resistor R14 and the fifteenth resistor R15 is coupled to the third resistor U3, a connection node of the thirteenth resistor R14 and the thirteenth resistor R13 is connected with the thirteenth resistor R13, and the thirteenth resistor R3 is connected with the other end of the thirteenth resistor C3 in parallel, and the thirteenth resistor R13 is connected with the thirteenth resistor C3, and the thirteenth resistor R13 is connected with the thirteenth resistor C, and the thirteenth resistor is connected with the thirteenth resistor.
2. An anti-interference photosensor driving control method based on the anti-interference photosensor driving circuit of claim 1, characterized in that the anti-interference photosensor driving control method comprises the steps of:
Acquiring the ambient illumination intensity received by a current photoelectric switch, and generating an ambient light brightness value based on the ambient illumination intensity;
Acquiring a self light brightness value of a photoelectric switch, and converting the self light brightness value and an ambient light brightness value of the photoelectric switch into a photoelectric output signal based on the self light brightness value and the ambient light brightness value of the photoelectric switch;
obtaining a driving output voltage result according to the photoelectric output signal, wherein the driving output voltage result comprises a low-level output voltage result and a high-level output voltage result;
And generating a driving control command based on the driving output voltage result, and controlling each driving terminal to start or stop in response to the driving control command.
3. The anti-interference driving control method of a photoelectric sensor according to claim 2, wherein the obtaining the ambient light intensity received by the current photoelectric switch and generating the ambient light intensity value based on the ambient light intensity specifically comprises:
The illumination intensity of visible light and the illumination intensity of infrared light of the photoelectric switch in the current environment are obtained, wherein the illumination intensity of the visible light and the illumination intensity of the infrared light are the environment illumination intensity received by the current photoelectric switch;
and acquiring the ambient light brightness value based on a preset multi-illumination intensity fitting formula according to the illumination intensity of the visible light and the illumination intensity of the infrared light.
4. The anti-interference driving control method for a photoelectric sensor according to claim 3, wherein the obtaining the ambient light brightness value based on a preset multi-illumination intensity fitting formula according to the illumination intensity of the visible light and the illumination intensity of the infrared light specifically comprises:
Respectively bringing the illumination intensity of the visible light and the illumination intensity of the infrared light into the multi-illumination intensity fitting formula to obtain a plurality of initial environment light brightness values calculated by the multi-illumination intensity fitting formula;
and obtaining the ambient light brightness value based on the average value of the initial ambient light brightness values.
5. The anti-interference driving control method for a photoelectric sensor according to claim 2, wherein the obtaining the self-luminance value of the photoelectric switch is based on the self-luminance value of the photoelectric switch and the ambient light value to convert the self-luminance value into a photoelectric output signal, and specifically comprises:
acquiring a self brightness value of the photoelectric switch based on the working state of the photoelectric switch module;
and acquiring a preset photoelectric conversion coefficient, and calculating a photoelectric output signal based on the self brightness value, the ambient brightness value and the photoelectric conversion coefficient of the photoelectric switch.
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| CN201069504Y (en) * | 2007-06-13 | 2008-06-04 | 惠州市康力电子有限公司 | Automatic back light control device for flat plate display |
| CN111835423A (en) * | 2020-08-07 | 2020-10-27 | 武汉锐奥特科技有限公司 | Communication system of QSFP28 type packaged 100G optical module |
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| CN110858297B (en) * | 2018-08-24 | 2023-10-24 | 华为技术有限公司 | Optical fingerprint identification circuit |
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| CN201069504Y (en) * | 2007-06-13 | 2008-06-04 | 惠州市康力电子有限公司 | Automatic back light control device for flat plate display |
| CN111835423A (en) * | 2020-08-07 | 2020-10-27 | 武汉锐奥特科技有限公司 | Communication system of QSFP28 type packaged 100G optical module |
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