CN116208135A - Photoelectric trigger circuit with adjustable sensitivity and trigger method - Google Patents
Photoelectric trigger circuit with adjustable sensitivity and trigger method Download PDFInfo
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- CN116208135A CN116208135A CN202310177477.6A CN202310177477A CN116208135A CN 116208135 A CN116208135 A CN 116208135A CN 202310177477 A CN202310177477 A CN 202310177477A CN 116208135 A CN116208135 A CN 116208135A
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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
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/041—Modifications for accelerating switching without feedback from the output circuit to the control circuit
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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
- H03K17/16—Modifications for eliminating interference voltages or currents
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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
Abstract
The application relates to a photoelectric trigger circuit with adjustable sensitivity and a trigger method, wherein the circuit comprises a reflective photoelectric switch module, a cooperative reflection device, a hysteresis voltage comparison module and a control module, the reflective photoelectric switch module comprises a transmitting end and a receiving end, the cooperative reflection device is used for reflecting an optical signal sent by the transmitting end to the receiving end, and the reflective photoelectric switch module outputs a voltage signal; the hysteresis voltage comparison module is provided with an upper limit threshold voltage and a lower limit threshold voltage, and is configured to output a trigger signal according to the fact that the received voltage signal is larger than the upper limit threshold voltage before being in a trigger state; the control module is configured to output a control signal after receiving the trigger signal. The application utilizes the reflective photoelectric switch module to obtain the test state, and the hysteresis voltage comparison module is used for preliminary identification and processing to obtain the high-efficiency stable trigger signal, and the whole circuit has the advantages of short response time, long service life and improvement of working efficiency.
Description
Technical Field
The application relates to the technical field of trigger detection, in particular to a photoelectric trigger circuit with adjustable sensitivity and a trigger method.
Background
The optical fiber end face detection system is an optical detection system which records the optical fiber end face by utilizing an optical imaging system and an optical-electrical sensing system, and processes the optical fiber end face image to obtain the detected optical fiber end face information. In actual production, a large number of different fiber end faces need to be inspected in real time. Therefore, frequent triggering of the optical imaging system to acquire the fiber-optic endface image is required.
At present, special optical fiber end face detection equipment is used for triggering image acquisition, and a mechanical touch key is generally adopted or a reflective photoelectric switch is directly adopted for triggering. The service life of a mechanical touch key commonly used in the market is about tens of thousands to hundreds of thousands, and the mechanical touch key can be triggered thousands of times per day in the actual production process, so that the problem of short service life exists when the touch key is adopted for triggering. The direct reflection type photoelectric switch triggering mode is shown in fig. 1, and is mainly triggered by a reflection type photoelectric switch a and a cooperative reflection surface b thereof. The light emitted by the reflective photoelectric switch a is reflected back to the receiving surface of the reflective photoelectric switch ad by the cooperative reflecting surface b and converted into an electric signal. The electric signal converted by the reflective photoelectric switch a is input to the microcontroller c for identification processing, and the microcontroller c judges whether the magnitude of the converted electric signal is triggered or not. The method has higher requirements on the reflection efficiency and the processing precision of the combined reflection surface b, poorer consistency among different devices, and the electric signal size which influences the conversion of the surface oxidation or the dust, dirt and the like of the combined reflection surface b can cause larger electric signal fluctuation and greatly reduce the reliability of the electric signal.
Disclosure of Invention
The application provides a photoelectric trigger circuit with adjustable sensitivity and a trigger method, which are used for solving the problem that an optical imaging system cannot be triggered frequently, stably and reliably to take a picture in a traditional detection mode.
In a first aspect, the present application provides a photoelectric trigger circuit with adjustable sensitivity, which adopts the following technical scheme.
A sensitivity-adjustable optoelectronic trigger circuit, comprising:
the reflective photoelectric switch module comprises a transmitting end and a receiving end, and is configured to output a voltage signal corresponding to the intensity of the optical signal when the optical signal sent by the transmitting end is reflected to the receiving end;
the cooperative reflection device is rotatably arranged and is configured to reflect the optical signals emitted by the emitting end to the receiving end;
the hysteresis voltage comparison module is connected with the reflective photoelectric switch module, an upper limit threshold voltage and a lower limit threshold voltage are set in the hysteresis voltage comparison module, the hysteresis voltage comparison module is configured to output a trigger signal according to the fact that a received voltage signal is larger than the upper limit threshold voltage before being in a trigger state, and is further configured to stop outputting the trigger signal according to the fact that the received voltage signal is smaller than the lower limit threshold voltage when being in the trigger state;
the control module is connected with the hysteresis voltage comparison module and is configured to output a control signal after receiving a trigger signal.
By adopting the technical scheme, the light rays emitted by the emitting end are reflected to the receiving end by utilizing the rotation of the cooperative reflection device, so that electric signals with different sizes are formed. Meanwhile, the hysteresis voltage comparison module receives the electric signal, selects a corresponding threshold voltage value according to the current state, and determines whether the hysteresis voltage comparison module needs to send a trigger signal or not according to the voltage value of the electric signal and the threshold value. The upper threshold voltage and the lower threshold voltage are utilized to provide a voltage window for the hysteresis voltage comparison module, and the generation of the trigger signal is reduced to be greatly influenced by the fluctuation of the electric signal, so that frequent and stable trigger control output is realized.
In a second aspect, the present application provides a triggering method, which adopts the following technical scheme.
A triggering method comprising the steps of:
calculating an upper limit threshold voltage value and a lower limit threshold voltage value set by the hysteresis voltage comparison module;
obtaining the output voltage value of the current reflective photoelectric switch module and the output state of the hysteresis voltage comparison module;
based on the output state of the hysteresis voltage comparison module, comparing the output voltage value with a threshold voltage value corresponding to the output state, and determining whether to change the output state of the hysteresis voltage comparison module according to the comparison result, wherein the threshold voltage value corresponding to the output state is one of an upper limit threshold voltage value and a lower limit threshold voltage value.
In summary, the present application includes at least one of the following beneficial technical effects.
The non-contact type pure hardware triggering mode is adopted, a photoelectric switch sensor is utilized to obtain a test state, and the hysteresis voltage comparison module is used for preliminary identification and processing to obtain a high-efficiency stable triggering signal.
The whole circuit can work at a higher speed, has the advantages of short response time, long service life and stable and reliable triggering, can lighten the working intensity of operators and improves the working efficiency.
The trigger threshold can be adjusted by an adjustable potentiometer Rp, so that the anti-interference performance of the circuit is improved, and the trigger threshold can be applied to more different scenes.
Drawings
Fig. 1 is a system block diagram of a noncontact reflection trigger scheme employed in the related art.
Fig. 2 is a system block diagram of a sensitivity-adjustable optoelectronic trigger circuit in an embodiment of the present application.
Fig. 3 is a schematic diagram of a sensitivity-adjustable photoelectric trigger circuit according to an embodiment of the present application.
Fig. 4 is a schematic diagram illustrating the operation of the reflective photoelectric switch at a first angle according to an embodiment of the present application.
Fig. 5 is a schematic diagram illustrating the operation of the reflective optoelectronic switch at a second angle in an embodiment of the present application.
Reference numerals illustrate: 1. a reflective photovoltaic switch module; 2. cooperative reflection means; 3. a hysteresis voltage comparison module; 31. an adjustable reference voltage unit; 32. a hysteresis comparator unit; 33. a voltage stabilizing unit; 4. and a control module.
Description of the embodiments
The present application is described in further detail below in conjunction with fig. 1-5.
Referring to fig. 1, in the prior art, a reflective electro-optical switch a and a cooperating reflective surface b are typically used for non-contact triggering. The reflective photoelectric switch a outputs an optical signal, and then the optical signal is reflected back into the reflective photoelectric switch a through the cooperative reflection surface b. The light signal size of the receiving surface of the reflective photoelectric switch a is changed by utilizing the cooperative reflecting surface b, so that the current output by the receiving surface of the reflective photoelectric switch is changed, and the signal size is transferred. The microcontroller c is used for detecting the signal size, and the microcontroller c is used for generating a control signal for triggering the optical imaging system to acquire the end face image of the optical fiber.
The embodiment of the application discloses a photoelectric trigger circuit with adjustable sensitivity. Referring to fig. 2, the adjustable sensitivity photoelectric trigger circuit includes a reflective photoelectric switch module 1, a cooperative reflection device 2, a hysteresis voltage comparison module 3 and a control module 4. The reflective photoelectric switch module 1 is connected with the hysteresis voltage comparison module 3, and the hysteresis voltage comparison module 3 is connected with the control module 4. The reflective photoelectric switch module 1 receives the optical signals reflected by the cooperative reflection device 2 and outputs electric signals, the electric signals are input into the hysteresis voltage comparison module 3 and compared with the upper limit threshold voltage and the lower limit threshold voltage set in the hysteresis voltage comparison module 3, and when the comparison result meets the set condition, a trigger signal is output; the control module 4 receives the trigger signal and outputs a control signal.
Referring to fig. 2 and 3, the reflective photoelectric switch module 1 has a transmitting terminal LD, from which an optical signal is transmitted, and a receiving terminal PD, from which the reflected optical signal is received. The cooperative reflection device 2 is rotatably arranged, a reflection surface is arranged on the cooperative reflection device 2, and the quantity of light rays reflected to the receiving end PD of the reflective photoelectric switch module 1 after the light signals emitted by the emitting end LD pass through the reflection surface is changed by rotating the cooperative reflection device 2. The receiving end PD of the reflective photoelectric switch module 1 changes its on-resistance value according to the magnitude of the received optical signal, and after the reflective photoelectric switch module 1 is connected to a power supply, the magnitude of the electrical signal output by the reflective photoelectric switch module 1 is changed.
Referring to fig. 4 and 5, when a large included angle (for example, in the range of 30 ° to 60 °) exists between the emitting surface of the emitting end LD and the reflecting surface of the cooperative reflecting device 2, most of the light is reflected to other positions by the reflecting surface, the amount of the light received by the receiving end PD is small, the light reflection efficiency is low, and the resistance value of the receiving end PD increases. The smaller the output current signal is after the receiving terminal PD is powered on.
The angle between the emitting surface of the emitting end LD and the reflecting surface of the cooperative reflecting means 2 gradually decreases until 0 °, at which time the emitting surface of the emitting end LD and the reflecting surface of the cooperative reflecting means 2 are parallel. The reflection surface reflects most of the light into the receiving end PD, so that the light reflection efficiency is maximum and the resistance value of the receiving end PD is minimum. After the receiving end PD is connected to the power supply, the output current signal is maximum.
Thus, the current output from the receiving terminal PD gradually increases as the cooperative reflection means 2 is rotated such that the angle between the emitting surface and the reflection gradually becomes smaller from the large until the emitting surface and the reflection surface are parallel. The magnitude of the current signal is proportional to the intensity of the reflected light signal, i.e., the current signal is proportional to the intensity of the reflected light signal.
Referring to fig. 3, the reflective photoelectric switch module 1 includes a first resistor R1, a second resistor R2, a light emitting diode, and a power detector. Wherein the light emitting diode and the power detector are integrated in one component and are also called as reflective photoelectric switch D1. The light emitting diode is the transmitting end LD in the reflective photoelectric switch D1, and the power detector is the receiving end PD in the reflective photoelectric switch. The first resistor R1 and the light emitting diode are connected in series between the power supply and the ground wire, the cathode of the light emitting diode is grounded, and the light emitting diode starts to emit light after being connected to the power supply. The second resistor R2 is connected in series with the power detector, and the power detector is connected with the power supply, the second resistor R2 is connected with the ground, and the connection node between the power detector and the second resistor R2 outputs a voltage signal. When the amount of received light of the power detector changes, the resistance inside the power detector changes, thereby changing the voltage value at the connection node between the second resistor R2 and the power detector.
The hysteresis voltage comparison module 3 comprises an adjustable reference voltage unit 31, a hysteresis comparator unit 32 and a voltage stabilizing unit 33, wherein the hysteresis comparator unit 32 is connected with the adjustable reference voltage unit 31, and the voltage stabilizing unit 33 is connected with the hysteresis comparator unit 32. The adjustable reference voltage unit 31 outputs a reference voltage with an adjustable value, and the voltage stabilizing unit 33 provides a voltage stabilizing value for the output terminal of the hysteresis comparator unit 32. The hysteresis comparator unit 32 is configured to receive the reference voltage value, and based on the voltage stabilizing value of the voltage stabilizing unit, the hysteresis comparator unit 32 establishes an upper threshold voltage value and a lower threshold voltage value, where the upper threshold voltage value is greater than the lower threshold voltage value. Between the upper threshold voltage value and the lower threshold voltage value is a voltage window range value, and when the input voltage of the hysteresis comparator unit 32 is within the voltage window range value, the output level of the hysteresis comparator unit is unchanged.
Specifically, the hysteresis voltage comparing module 3 includes an adjustable potentiometer Rp, an operational amplifier U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a zener diode D2. The adjustable potentiometer Rp is connected in series between a power supply and a ground, and the active end of the adjustable potentiometer Rp is connected with the inverting input end of the operational amplifier U1. After the adjustable potentiometer Rp is connected to the power supply and the ground, a variable reference voltage value is output from the active end of the adjustable potentiometer Rp, i.e. the adjustable reference voltage unit 31 is the adjustable potentiometer Rp.
The hysteretic comparator unit 32 is composed of a third resistor R3, a fourth resistor R4, and an operational amplifier U1 together. The third resistor R3 is connected to the noninverting input terminal of the operational amplifier U1, the third resistor R3 is connected to the reflective photoelectric switch module 1, and the fourth resistor R4 is connected in series between the noninverting input terminal of the operational amplifier U1 and the output terminal of the operational amplifier U1.
The fifth resistor R5 and the zener diode D2 form a zener unit 33, the fifth resistor R5 is connected in series between the output end of the operational amplifier U1 and the power supply, the zener diode D2 is connected in series between the output end of the operational amplifier U1 and the ground line, and the anode of the zener diode D2 is grounded.
The inverting input terminal of the operational amplifier U1 is connected to the adjustable reference voltage unit 31, the adjustable reference voltage value output by the adjustable reference voltage unit 31 is used as a reference voltage, and the reference voltage is:
wherein, the method comprises the steps of, wherein,
for the resistance value between the inverting input terminal of the operational amplifier U1 and ground,
is the total resistance of the adjustable potentiometer Rp. The fifth resistor R5 is a pull-up resistor, and is used for increasing the driving capability of the output end of the operational amplifier U1, and the zener diode D2 is a 3.3V zener diode D2, so that the high level output by the output end of the operational amplifier U1 is 3.3V. For the hysteresis comparator unit, the upper threshold voltage is set as follows:
the lower threshold voltage is:
. When the value of the input voltage signal at the non-inverting input terminal is greater than the upper threshold voltage
When the value of the input voltage signal at the non-inverting input terminal is smaller than the lower threshold voltage, the output terminal of the operational amplifier U1 outputs 3.3V high level
At this time, the output terminal of the operational amplifier U1 outputs a low level 0V. Window voltage return difference exists between upper and lower threshold voltages
。
Noise is prevented from being generated in the input voltage signal, and the output end of the operational amplifier U1 acts erroneously to repeatedly output high and low levels. Upper and lower thresholds thereofThe voltage may be adjusted by adjusting the reference voltage
To change the value of (a)
The value of (2) can be achieved by changing the resistance of the adjustable potentiometer Rp, and thus the trigger signal sensitivity adjustment can be achieved by changing the resistance of the adjustable potentiometer Rp.
When the control module 4 receives the high-level signal trigger signal output by the hysteresis voltage comparison module 3 and the hysteresis comparator unit outputs high level 3.3V, the control module 4 sends out a trigger command to enable the fiber end face detection system to acquire the fiber end face image at the corresponding moment. When the hysteresis comparator unit outputs low level 0V, the control module 4 stops sending out the trigger command, so that the optical fiber end face detection system enters a state to be triggered, and waits for the next measurement.
Referring to fig. 4 and fig. 5, before the test, the cooperative reflection device 2 is set to a first angle position with the reflective photoelectric switch, specifically, an included angle between the emitting surface of the emitting end LD and the reflecting surface of the cooperative reflection device 2 is 45 °, at this time, most of the optical signals are scattered outwards, and the receiving end of the reflective photoelectric switch only receives a small part of the optical signals. The converted voltage signal is smaller than the lower limit threshold voltage of the hysteresis comparator unit and is also lower than the upper limit threshold voltage, and the hysteresis comparator unit outputs a low level, so that the system is in a state to be triggered.
When the cooperative reflection device 2 is shifted to a second angle position with the reflective photoelectric switch, specifically, an included angle between the emitting surface of the emitting end LD and the reflecting surface of the cooperative reflection device 2 is 0 °, that is, the emitting surface is parallel to the reflecting surface, at this time, most of the optical signals are reflected to the receiving end of the reflective photoelectric switch, the converted voltage signals are larger than the upper limit threshold voltage of the hysteresis comparator unit, the hysteresis comparator unit outputs a high level, and at this time, the control module 4 controls the optical system to collect the image at this moment.
After the triggering is completed, the cooperative reflection device 2 is shifted to a first angle position with the reflective photoelectric switch, the converted voltage signal is smaller than the lower limit threshold voltage of the hysteresis comparator, the hysteresis comparator unit outputs low level, and the system is in a state to be triggered again.
The embodiment of the application also discloses a triggering method. The triggering method comprises the following steps.
S1, calculating an upper limit threshold voltage value and a lower limit threshold voltage value set by the hysteresis voltage comparison module 3.
S2, obtaining the output voltage value of the current reflective photoelectric switch module and the output state of the hysteresis voltage comparison module 3.
S3, based on the output state of the hysteresis voltage comparison module 3, comparing the output voltage value with a threshold voltage value corresponding to the output state, and determining whether to change the output state of the hysteresis voltage comparison module 3 according to a comparison result.
The threshold voltage value corresponding to the output state is one of an upper threshold voltage value and a lower threshold voltage value.
In step S3, the following steps are included.
S31, determining that the output state of the hysteresis voltage comparison module 3 is low level.
S32, determining that the threshold voltage value corresponding to the output state is an upper limit threshold voltage value based on the output state being a low level.
S33, judging whether the output voltage value is higher than an upper limit threshold voltage value.
And S34, if yes, the output state of the inverting hysteresis voltage comparison module 3 is high level, and if no, the output state of the hysteresis voltage comparison module 3 is kept low level.
S35, determining that the output state of the hysteresis voltage comparison module 3 is high level.
S36, determining that the threshold voltage value corresponding to the output state is a lower threshold voltage value based on the output state being a high level.
S37, judging whether the output voltage is lower than a lower threshold voltage.
And S38, if yes, the output state of the flip-flop voltage comparison module 3 is at a low level, and if no, the output state of the flip-flop voltage comparison module 3 is kept at a high level.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (7)
1. An adjustable sensitivity optoelectronic trigger circuit, comprising:
a reflective photoelectric switch module (1), wherein the reflective photoelectric switch module (1) comprises a transmitting end and a receiving end, and the reflective photoelectric switch module (1) is configured to output a voltage signal corresponding to the intensity of an optical signal emitted by the transmitting end when the optical signal is reflected to the receiving end;
a cooperative reflection means (2), the cooperative reflection means (2) being rotatably arranged, the cooperative reflection means (2) being configured to reflect an optical signal emitted by the transmitting end to the receiving end;
the hysteresis voltage comparison module (3), the hysteresis voltage comparison module (3) is connected with the reflective photoelectric switch module (1), an upper limit threshold voltage and a lower limit threshold voltage are set in the hysteresis voltage comparison module (3), the hysteresis voltage comparison module (3) is configured to output a trigger signal according to the received voltage signal being larger than the upper limit threshold voltage before being in a trigger state, and is further configured to stop outputting the trigger signal according to the received voltage signal being smaller than the lower limit threshold voltage after being in the trigger state;
the control module (4) is connected with the hysteresis voltage comparison module (3), and the control module (4) is configured to output a control signal after receiving a trigger signal.
2. The adjustable sensitivity optoelectronic flip-flop of claim 1, wherein: the reflective photoelectric switch module (1) comprises a first resistor R1, a second resistor R2, a light emitting diode and a power detector, wherein the first resistor R1 and the light emitting diode are commonly connected in series between a power supply and a ground wire, and the cathode of the light emitting diode is grounded; the second resistor R2 is connected in series with a power detector, the power detector is connected with a power supply, and the second resistor R2 is connected with a ground wire; the connection node between the power detector and the second resistor R2 outputs a voltage signal.
3. The adjustable sensitivity optoelectronic flip-flop of claim 1, wherein: the hysteresis voltage comparison module (3) comprises an adjustable reference voltage unit (31), a hysteresis comparator unit (32) and a voltage stabilizing unit (33), wherein the hysteresis comparator unit (32) is connected with the adjustable reference voltage unit (31), the voltage stabilizing unit (33) is connected with the hysteresis comparator unit (32), and the hysteresis comparator unit (32) is configured to set an upper limit threshold voltage value and a lower limit threshold voltage value in the hysteresis comparator unit (32) according to a reference voltage value output by the adjustable reference voltage unit (31) and a voltage stabilizing value of the voltage stabilizing unit (33).
4. A sensitivity-adjustable optoelectronic flip-flop according to claim 3, wherein: the hysteresis voltage comparison module (3) comprises an adjustable potentiometer Rp, an operational amplifier U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a zener diode D2; the adjustable potentiometer Rp is connected in series between a power supply and a ground wire, and the movable end of the adjustable potentiometer Rp is connected with the inverting input end of the operational amplifier U1; the third resistor R3 is connected with the non-inverting input end of the operational amplifier U1, the third resistor R3 is connected with the reflective photoelectric switch module (1), and the fourth resistor R4 is connected in series between the non-inverting input end of the operational amplifier U1 and the output end of the operational amplifier U1; the fifth resistor R5 is connected in series between the output terminal of the operational amplifier U1 and the power supply, the zener diode D2 is connected in series between the output terminal of the operational amplifier U1 and the ground, and the anode of the zener diode D2 is grounded.
5. A method of triggering comprising the steps of:
calculating an upper limit threshold voltage value and a lower limit threshold voltage value set by the hysteresis voltage comparison module (3);
obtaining the output voltage value of the current reflective photoelectric switch module (1) and the output state of the hysteresis voltage comparison module (3);
based on the output state of the hysteresis voltage comparison module (3), comparing the output voltage value with a threshold voltage value corresponding to the output state, and determining whether to change the output state of the hysteresis voltage comparison module (3) according to the comparison result, wherein the threshold voltage value corresponding to the output state is one of an upper limit threshold voltage value and a lower limit threshold voltage value.
6. The method according to claim 5, wherein the step of comparing the output voltage value with the threshold voltage value corresponding to the output state based on the output state of the hysteresis voltage comparing module (3) and determining whether to change the output state of the hysteresis voltage comparing module (3) according to the comparison result comprises:
determining that the output state of the hysteresis voltage comparison module (3) is low level;
determining that a threshold voltage value corresponding to the output state is an upper threshold voltage based on the output state being a low level;
judging whether the output voltage value is higher than an upper limit threshold voltage value;
if yes, the output state of the flip-flop voltage comparison module (3) is at a high level, and if no, the output state of the flip-flop voltage comparison module (3) is kept at a low level.
7. The method according to claim 5, wherein the step of comparing the output voltage value with the threshold voltage value corresponding to the output state based on the output state of the hysteresis voltage comparing module (3) and determining whether to change the output state of the hysteresis voltage comparing module (3) according to the comparison result comprises:
determining that the output state of the hysteresis voltage comparison module (3) is high level;
determining a threshold voltage value corresponding to the output state as a lower threshold voltage based on the output state being a high level;
judging whether the output voltage is lower than a lower limit threshold voltage value;
if yes, the output state of the flip-flop voltage comparison module (3) is at a low level, and if no, the output state of the flip-flop voltage comparison module (3) is kept at a high level.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310177477.6A CN116208135A (en) | 2023-02-28 | 2023-02-28 | Photoelectric trigger circuit with adjustable sensitivity and trigger method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310177477.6A CN116208135A (en) | 2023-02-28 | 2023-02-28 | Photoelectric trigger circuit with adjustable sensitivity and trigger method |
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| CN116208135A true CN116208135A (en) | 2023-06-02 |
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| CN202310177477.6A Pending CN116208135A (en) | 2023-02-28 | 2023-02-28 | Photoelectric trigger circuit with adjustable sensitivity and trigger method |
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