CN219918902U

CN219918902U - Strong light interference resistant circuit and photoelectric switch

Info

Publication number: CN219918902U
Application number: CN202321046384.1U
Authority: CN
Inventors: 王子夷
Original assignee: Weton Electronics Co ltd
Current assignee: Weton Electronics Co ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-10-27
Anticipated expiration: 2033-05-04

Abstract

The utility model discloses a strong light interference resistant circuit and a photoelectric switch, which belongs to the technical field of photoelectric switches, wherein the strong light interference resistant circuit is applied to the photoelectric switch comprising a photoelectric transmitting module and a photoelectric receiving module, is arranged between a signal receiving circuit and a signal processing circuit in the photoelectric receiving module, and comprises the following components: the input end of the amplifying module is connected with a photoelectric receiving tube of the signal receiving circuit, and the output end of the amplifying module is connected with the upper computer through the signal processing circuit; and the input end of the alarm module is connected with a photoelectric receiving tube of the signal receiving circuit, the output end of the alarm module is connected with the upper computer, an early warning judging signal is generated according to a detection signal output by the photoelectric receiving tube, the early warning judging signal is output to the upper computer, and the early warning judging signal is used for judging whether the photoelectric switch is interfered by strong light. The utility model solves the problem of poor universality of the optical interference protection arrangement of the photoelectric switch in the prior art, provides an effective solution for different degrees of optical interference, and has the effect of good universality.

Description

Strong light interference resistant circuit and photoelectric switch

Technical Field

The utility model relates to the technical field of photoelectric switches, in particular to a strong light interference resistant circuit and a photoelectric switch.

Background

A photoelectric switch is generally used as a leveling layer switch for detecting distance in the elevator industry. In the current implementation manner of the photoelectric switch, in some special application occasions, such as places with direct sunlight, such as a mall sightseeing ladder, the phenomenon of misoperation of the sensor can be caused. Currently, external direct light protection is generally adopted in the related art, for example: and shielding components such as a limiting block, a limiting hole and the like are arranged at the transmitting pipe and the receiving pipe for direct protection. Although the problem of light interference is solved to a certain extent to this protection mode, can directly influence photoelectric switch's luminousness, still can have photoelectric switch mistake output's condition to when receiving the highlight interference, if the protection is not put in place and lead to photoelectric switch mistake output, also can not in time remind the staff.

Therefore, the optical interference protection device of the photoelectric switch in the prior art has the technical problem of poor universality.

Disclosure of Invention

The main purpose of the utility model is that: the utility model provides a strong light interference resistant circuit and photoelectric switch, aim at solving among the prior art photoelectric switch's light interference protection setting and have the technical problem that the commonality is relatively poor.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the present utility model provides an anti-strong light interference circuit, applied to an optoelectronic switch, where the optoelectronic switch includes an optoelectronic transmitting module and an optoelectronic receiving module, the optoelectronic receiving module includes a signal receiving circuit and a signal processing circuit, the anti-strong light interference circuit is disposed between the signal receiving circuit and the signal processing circuit, and the anti-strong light interference circuit includes:

the input end of the amplifying module is connected with a photoelectric receiving tube D2 of the signal receiving circuit, and the output end of the amplifying module is connected with the upper computer through the signal processing circuit;

the input end of the alarm module is connected with a photoelectric receiving tube D2 of the signal receiving circuit, and the output end of the alarm module is connected with the upper computer;

the alarm module is used for generating an early warning judging signal according to the detection signal output by the photoelectric receiving tube D2 and outputting the early warning judging signal to the upper computer, wherein the early warning judging signal is used for judging whether the photoelectric switch is interfered by strong light.

Optionally, in the anti-strong light interference circuit, the amplifying module is configured to amplify the detection signal and output an amplified signal to the signal processing circuit;

the amplifying module comprises an amplifier U2;

the positive input end of the amplifier U2 is connected with the positive electrode of the photoelectric receiving tube D2, the negative electrode of the photoelectric receiving tube D2 is grounded, the negative input end of the amplifier U2 is respectively connected with one end of the capacitor C5, one end of the resistor R6 and one end of the capacitor C6, the other end of the capacitor C5 is grounded, the other end of the resistor R6 and the other end of the capacitor C6 are both connected with the output end of the amplifier U2, and the output end of the amplifier U2 is connected with the blocking capacitor C2 of the signal processing circuit.

Optionally, in the anti-strong light interference circuit, the amplifying module further includes a resistor R4 and a resistor R5;

one end of the resistor R4 and one end of the resistor R5 are connected with the negative input end of the amplifier U2, and the other end of the resistor R4 and the other end of the resistor R5 are grounded.

Optionally, in the above anti-strong light interference circuit, the amplification factor of the amplifier U2 is determined according to parameters of the resistor R4, the resistor R5, the capacitor C5, the resistor R6 and the capacitor C6, and the amplification factor Y of the amplifier U2 is:

wherein R is ₆ Represents the resistance value of the resistor R6, C ₆ Representing the capacitance value, R, of the capacitor C6 ₄ Represents the resistance value of the resistor R5, R ₄ Represents the resistance value of the resistor R4, C ₅ The capacitance of the capacitor C5 is represented, and f represents the frequency of the high-frequency pulse applied to the photoemitter.

Optionally, in the anti-strong light interference circuit, the alarm module includes a logic device;

the first input end of the logic device is connected with the positive electrode of the photoelectric receiving tube D2, the second input end of the logic device is connected with the working voltage through a resistor R8, and the output end of the logic device is connected with the upper computer.

Optionally, in the anti-strong light interference circuit, the alarm module further includes a filter unit, and the first input end of the logic device is connected with the positive electrode of the photoelectric receiving tube D2 through the filter unit;

and the filtering unit is used for carrying out low-pass filtering on the detection signal and outputting the detection signal to the logic device.

Optionally, in the anti-strong light interference circuit, the filtering unit includes a resistor R7 and a capacitor C7;

one end of the resistor R7 and one end of the capacitor C7 are connected with the first input end of the logic device, the other end of the resistor R7 is connected with the positive electrode of the photoelectric receiving tube D2, and the other end of the capacitor C7 is grounded.

Optionally, in the anti-strong light interference circuit, the logic device includes at least one of: exclusive or gate U3, and gate, and or gate.

Optionally, in the anti-strong light interference circuit, the signal processing circuit includes a post-stage amplifying circuit or a post-stage processing circuit, wherein the post-stage amplifying circuit includes a detection amplifying unit and a logic processing unit, and the post-stage processing circuit includes a singlechip and peripheral devices thereof.

In a second aspect, the present utility model further provides an optoelectronic switch connected to an upper computer, where the optoelectronic switch includes:

a photoemission module;

a photoelectric receiving module;

the photoelectric receiving module comprises the strong light interference resistant circuit, a signal receiving circuit and a signal processing circuit.

The one or more technical schemes provided by the utility model can have the following advantages or at least realize the following technical effects:

according to the anti-strong light interference circuit and the photoelectric switch, the anti-strong light interference circuit can be arranged between the signal receiving circuit and the signal processing circuit of the photoelectric receiving module, and aiming at external strong light interference, on the basis that a shielding component of the photoelectric switch provides protection, a detection signal output by the photoelectric receiving tube D2 is amplified through the amplifying module, so that the signal processing circuit can be conveniently and accurately identified, the misoperation of the photoelectric switch is avoided, and the light transmittance of the photoelectric switch is effectively improved; and the alarm module is used for carrying out logic judgment according to the detection signal to generate an early warning judgment signal, the early warning judgment signal is used for judging whether the photoelectric switch is subjected to strong light interference or not, outputting the early warning judgment signal to the upper computer, and carrying out alarm prompt when the photoelectric switch is subjected to strong light interference so as to facilitate staff to take measures in time and prevent larger adverse effects. The anti-strong light interference circuit can increase the light transmittance of the photoelectric switch when the protection is in place, and can remind workers in time when the protection is not in place, so that an effective solution can be provided for light interference of different degrees, and the anti-strong light interference circuit has good universality, reliability and applicability.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic connection diagram of an optoelectronic receiving module in a first embodiment of an anti-interference circuit of the present utility model;

FIG. 2 is a circuit diagram of an optical receiver module in a first embodiment of an anti-crosstalk circuit according to the present utility model;

FIG. 3 is a schematic circuit diagram of an amplifying module in a second embodiment of the anti-interference circuit of the present utility model;

fig. 4 is a schematic circuit diagram of a warning module in a third embodiment of the anti-interference circuit of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a device or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such device or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude that an additional identical element is present in a device or system comprising the element. In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; the communication between the two elements can be realized, or the interaction relationship between the two elements can be realized. In the present utility model, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the present utility model, suffixes such as "module", "part" or "unit" used for representing elements are used only for facilitating the description of the present utility model, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Currently, a photoelectric switch is generally adopted as a leveling layer switch for detecting distance in the elevator industry. Currently, three implementations of such a photoelectric switch are mainly adopted:

firstly, discrete components are used for construction, a voltage stabilizing chip is used as a power supply circuit, a logic device inverter is used as an oscillating circuit, an output signal is sent to a transmitting tube, a corresponding receiving tube receives a relevant signal and then is sent to a detection amplifying circuit and a relevant logic circuit, such as an amplifying circuit, an integrating circuit and the like, and finally, the output is carried out through a triode. The transmitting and receiving light path generally adopts opposite-incidence type direct irradiation.

The second type is to build up by discrete components, to use voltage stabilizing chip, triode and voltage stabilizing tube as power circuit, to send high frequency pulse signal to the emitting tube by single chip, to receive relative signal by corresponding receiving tube, to process and analyze it by single chip, to output relative logic signal by single chip, and to output it by triode. The transmitting and receiving light path generally adopts opposite-incidence type direct irradiation.

Third, the power supply part is generally only provided with protection circuits such as a diode and a transient diode at the outside by adopting a custom chip, and other voltage stabilizing processes, relevant logic judgment, output circuits and the like are integrated in the custom chip, so that high integration is realized. The transmitting and receiving light path generally adopts a patch mode, and an independent special refraction and reflection type light path is designed.

In the first mode and the second mode, in terms of transmitting and receiving optical paths, a direct plug-in mode is adopted, and the direct anti-interference capability is not strong. When sunlight is directly emitted in special application occasions such as a sightseeing ladder in a market, the phenomenon of misoperation of the photoelectric switch is easily caused. For this, in both modes, different degrees of light interference protection arrangement are required. In the related art, external direct light protection is generally adopted, for example: and shielding components such as a limiting block, a limiting hole and the like are arranged at the transmitting pipe and the receiving pipe for direct protection. Although the protection mode solves the problem of light interference to a certain extent, the light transmittance of the photoelectric switch can be directly influenced, so that the situation of misoperation output of the photoelectric switch still exists in some application scenes with larger dust; in addition, although the protection mode can solve the problem of light interference to a certain extent, the protection mode still can not protect in place when strong light interference is received, so that the photoelectric switch outputs mistakenly, and at the moment, if workers are not timely reminded, more adverse effects can be caused.

In the third mode, the effect of avoiding the related light interference and the like is achieved through the highly integrated custom chip and the special circuit design. However, the method still has defects, and the method has certain barriers in the aspects of cost, technical realization and the like, so that the requirements of cost and product performance are difficult to synchronously realize.

Therefore, the technical problem of poor universality of the optical interference protection arrangement of the photoelectric switch is solved, and based on the technical problem, the utility model provides an anti-strong optical interference circuit and the photoelectric switch, and specific embodiments and implementation modes are as follows:

example 1

Referring to fig. 1 to 2, the present embodiment provides an anti-strong light interference circuit, which can be applied to an optoelectronic switch. The photoelectric transmitting tube and the photoelectric receiving tube of the photoelectric switch can be provided with shielding components, such as limiting blocks, limiting holes and the like, and can be specifically arranged according to actual needs. The photoelectric switch may include a photoelectric transmitting module and a photoelectric receiving module, as shown in fig. 1, which is a connection schematic diagram of the photoelectric receiving module in the photoelectric switch of this embodiment, the photoelectric receiving module may include a signal receiving circuit and a signal processing circuit, and an anti-strong light interference circuit may be disposed between the signal receiving circuit and the signal processing circuit, and may specifically include:

the alarm module is used for carrying out logic judgment according to the detection signal output by the photoelectric receiving tube D2, generating an early warning judgment signal and outputting the early warning judgment signal to the upper computer, wherein the early warning judgment signal is used for judging whether the photoelectric switch is interfered by strong light.

The amplifying module is used for amplifying the detection signal output by the photoelectric receiving tube D2 and outputting the amplified signal to the signal processing circuit.

As shown in the connection schematic diagram in fig. 1, the photoelectric receiving module may include a signal receiving circuit, a signal processing circuit and a strong light interference resistant circuit, where the strong light interference resistant circuit is connected to the signal receiving circuit and the signal processing circuit, respectively, an input end of the amplifying module in the strong light interference resistant circuit is connected to the signal receiving circuit, an output end of the amplifying module is connected to the signal processing circuit, the signal processing circuit is further connected to an upper computer, an input end of the alarm module is connected to the signal receiving circuit, and an output end of the alarm module is directly connected to the upper computer. It will be appreciated that the optoelectronic transmitting module (not shown in fig. 1) of the optoelectronic switch may include a signal transmitting circuit, a power circuit, and other basic circuits, which are not limited in this embodiment of the present disclosure.

In some embodiments, the signal transmitting circuit may convert the input current into an optical signal through the photoelectric transmitting tube and emit the optical signal, and the signal receiving circuit detects the target object according to the intensity or presence of the received light, specifically may sense the optical signal through the photoelectric receiving tube D2 and correspondingly output a detection signal; the amplifying module amplifies the detection signal output by the signal receiving circuit to obtain an amplified signal, and then outputs the amplified signal to a subsequent signal processing circuit; the signal processing circuit performs subsequent processing, such as integration processing, signal conversion processing, and the like, on the amplified signal to obtain an output signal, which can be used as the output of the photoelectric switch, and finally sent to the upper computer. In the process, the alarm module performs logic judgment according to the detection signal output by the signal receiving circuit to obtain an early warning judgment signal, the early warning judgment signal can be used for judging whether the photoelectric switch is interfered by strong light, the early warning judgment signal can be used as another output of the photoelectric switch and is sent to the upper computer, so that the upper computer performs corresponding alarm prompts, such as sound prompts, acousto-optic prompts, voice prompts and the like, and the early warning judgment signal can be specifically set according to actual needs.

By adding the anti-strong light interference circuit in the photoelectric switch, the photoelectric switch has the advantage of high light transmittance and the function of alarming on the basis of the function of strong light interference resistance. The requirements of the photoelectric switch on strong light interference resistance and high light transmittance are met to a certain extent, the alarm function is added, the early warning judgment signal is given to the upper computer to alarm, the practical application is more convenient, and the practical requirement is met. Moreover, the anti-strong light interference circuit can be realized by a simple discrete device, does not increase excessive cost, and reduces the cost compared with some schemes in the prior art, such as a scheme of adopting a custom chip.

Further, the signal processing circuit may include a post-stage amplifying circuit or a post-stage processing circuit, where the post-stage amplifying circuit may include a detection amplifying unit and a logic processing unit, and the post-stage processing circuit may include a single chip microcomputer and peripheral devices thereof.

In the first embodiment, the signal processing circuit may be a post-stage amplifying circuit, where the post-stage amplifying circuit includes a detection amplifying unit and a logic processing unit, and may perform detection amplification and logic processing on an amplified signal output by the amplifying module; in this embodiment, the post-stage amplification circuit is implemented by a discrete device.

In the second embodiment, the signal processing circuit may be a post-stage processing circuit, where the post-stage processing circuit includes a single chip microcomputer and peripheral devices thereof, and performs digital processing and judgment on the amplified signal output by the amplifying module; in this embodiment, the post-processing circuit is implemented by a programmable single-chip microcomputer, so that more functions can be implemented, but the cost is higher than that of the first embodiment. In practical applications, the signal processing circuit may be set as required.

In the conventional scheme, as shown in fig. 2, an original circuit diagram of a photoelectric receiving module in the photoelectric switch of the present embodiment, a signal receiving circuit and a signal processing circuit of the photoelectric receiving module may be implemented by using discrete devices, and when the two circuits are directly connected, as shown in fig. 2, the signal receiving circuit may include a photoelectric receiving tube D2, a capacitor C1 and a resistor R1; one end of the capacitor C1 and one end of the resistor R1 are connected with the power circuit, and can receive the working voltage VCC converted by the power circuit, such as 9V voltage, the other end of the capacitor C1 and the negative electrode of the photoelectric receiving tube D2 are grounded, and the other end of the resistor R1 and the positive electrode of the photoelectric receiving tube D2 are connected with the signal processing circuit. The signal processing circuit may include an amplifier U1, a blocking capacitor C2, a resistor R2, and a resistor R3, wherein the amplifier U1 may select an inverter; one end of a blocking capacitor C2 is connected with the signal receiving circuit, and is particularly connected with the other end of a resistor R1 and the anode of a photoelectric receiving tube D2 respectively, the other end of the blocking capacitor C2 is connected with the input end of an amplifier U1 through the resistor R2, the input end of the amplifier U1 is also connected with one end of a resistor R3, the other end of the resistor R3 and the output end of the amplifier U1 are both connected with an upper computer, and a signal OUT1 is output to the upper computer.

Based on the photoelectric receiving module without the strong light interference resisting circuit, the resistor R1 is connected with the working voltage VCC, the photoelectric receiving tube D2 receives the high-frequency pulse sent by the photoelectric transmitting tube, directly outputs a detection signal to the signal processing circuit after receiving, and outputs the detection signal to the amplifier U1 after passing through the blocking capacitor C2 and blocking, or continuously outputs the detection signal after integrating, converting and the like by the processing circuits such as the subsequent logic processing units and the like. In this scheme, because the problem of light interference can set up stopper, spacing hole etc. and shelter from in photoelectric switch's photoelectric emission pipe and photoelectric receiving tube D2 department, lead to photoelectric receiving tube D2 to switch on completely easily, there is low level too high in the anodal department of photoelectric receiving tube D2 promptly, when high to a certain extent, signal processing circuit can not discern the high frequency signal that signal receiving circuit output promptly detected signal, will lead to the condition of mistake output, the phenomenon that externally appears as photoelectric switch product's luminousness is low promptly.

In the practical application scene of the photoelectric switch, high light and more dust can appear at the same time, so that an anti-strong light interference circuit is introduced between the positive electrode of the photoelectric receiving tube D2 and the blocking capacitor C2, the problem that the signal processing circuit cannot recognize high-frequency signals is solved by the amplifying module of the anti-strong light interference circuit, and error output of the photoelectric switch is avoided, namely the transmittance of a photoelectric switch product is improved. According to the embodiment, on the current photoelectric switch scheme, the problem that requirements for high light interference resistance and high light transmittance cannot be met at the same time is solved, and the photoelectric switch is convenient to apply on site in more complex environments.

In some embodiments, the amplifying module may be disposed between the photo-reception cell D2 of the signal reception circuit and the blocking capacitor C2 of the signal processing circuit.

Optionally, the amplifying module may amplify the detection signal output by the photoelectric receiving tube D2 with an ac small signal to obtain an amplified signal, and then output the amplified signal to the signal processing circuit. The ac small signal is a signal with a frequency lower than one tenth of the frequency of the input signal of the amplifier, for example, may be a power frequency signal of 50 hz or other suitable signal.

In some current photoelectric receiving modules of the photoelectric switch, although there is a scheme of setting an amplifying module, in these schemes, after the amplifying module is generally set in the blocking capacitor, the detecting signal output by the photoelectric receiving tube is firstly blocked and filtered, and then the filtered signal is amplified. However, due to the influence of optical interference, the detection signal actually output by the photoelectric receiving tube may be very small, for example, the ac small signal may be filtered before amplification, which may result in that some useful small signals are filtered, so that the signal processing circuit cannot recognize the high-frequency signal.

In view of the above problems, in this embodiment, the amplifying module is disposed before the blocking capacitor C2, and compared with the scheme in which the amplifying module is disposed after the blocking capacitor, in this embodiment, the detecting signal output by the photoelectric receiving tube D2 includes an ac small signal, and after the amplified signal is obtained, the blocking capacitor C2 performs blocking and filtering, so as to ensure that the high-frequency signal output to the subsequent circuit can be identified, enhance the signal identification capability of the signal processing circuit, and achieve the effect of avoiding erroneous output of the photoelectric switch.

The anti-strong light interference circuit can be applied to a conventional photoelectric switch or a photoelectric switch with a shielding component, can be arranged between a signal receiving circuit and a signal processing circuit, and can amplify detection signals output by a photoelectric receiving tube D2 through an amplifying module on the basis of providing protection for the shielding component aiming at external strong light interference, thereby facilitating accurate identification of the signal processing circuit and avoiding misoperation of the photoelectric switch and further effectively improving the light transmittance of the photoelectric switch. And the alarm module is used for carrying out logic judgment according to the detection signal to generate an early warning judgment signal, outputting the early warning judgment signal to the upper computer, wherein the early warning judgment signal is used for judging whether the photoelectric switch is subjected to strong light interference or not, and carrying out alarm prompt when the photoelectric switch is subjected to strong light interference so as to facilitate staff to take measures in time and prevent larger adverse effects. The anti-strong light interference circuit can increase the light transmittance of the photoelectric switch when the protection is in place, and can remind workers in time when the protection is not in place, so that an effective solution can be provided for light interference of different degrees, and the anti-strong light interference circuit has good universality.

Example two

Referring to fig. 3, on the basis of the first embodiment, this embodiment further proposes an anti-strong light interference circuit.

Further, as shown in fig. 3, a schematic circuit diagram of the amplifying module is shown; the amplifying module may include an amplifier U2;

the positive input end IN+ of the amplifier U2 is connected with the positive electrode of the photoelectric receiving tube D2, the negative electrode of the photoelectric receiving tube D2 is grounded, the negative input end IN-of the amplifier U2 is respectively connected with one end of the capacitor C5, one end of the resistor R6 and one end of the capacitor C6, the other end of the capacitor C5 is grounded, the other end of the resistor R6 and the other end of the capacitor C6 are both connected with the output end OUT of the amplifier U2, and the output end OUT of the amplifier U2 is connected with the blocking capacitor C2 of the signal processing circuit.

The resistor R6 is a feedback resistor, the capacitor C6 is a feedback capacitor, and the capacitor C5 plays a role of amplifying and filtering. The amplifier U2 can adopt an in-phase amplifier or an anti-phase amplifier, and can be specifically selected according to actual needs.

Still further, the amplifying module may further include a resistor R4 and a resistor R5;

one end of the resistor R4 and one end of the resistor R5 are connected with the negative input end IN-of the amplifier U2, and the other end of the resistor R4 and the other end of the resistor R5 are grounded.

Further, the amplification factor of the amplifier U2 may be determined according to the parameters of the resistor R4, the resistor R5, the capacitor C5, the resistor R6 and the capacitor C6.

Specifically, the amplification factor Y of the amplifier U2 can be calculated according to the following formula:

wherein R is ₆ Represents the resistance value of the resistor R6, C ₆ Representing the capacitance value, R, of the capacitor C6 ₅ Represents the resistance value of the resistor R5, R ₄ Represents the resistance value of the resistor R4, C ₅ The capacitance of the capacitor C5 is represented, and f represents the frequency of the high-frequency pulse applied to the photoemitter.

In practical application, parameters of the resistor R4, the resistor R5, the capacitor C5, the resistor R6 and the capacitor C6 are reasonably set through the above formula, so that the amplification factor of the amplifier U2 can be adjusted, for example, the amplification module amplifies the detection signal by about 1000 times, so as to amplify the millivolt signal to the volt level, and the amplification module is actually set according to the needs. The amplified signal output by the amplifier U2 can be continuously supplied to a subsequent signal processing circuit to be amplified by an inverter, integrated and output, and the like, so that the photoelectric switch has high light transmittance on the basis of higher strong light interference resistance.

According to the anti-strong light interference circuit, the amplifier U2 is adopted in the amplifying module to amplify the received high-frequency signal, namely the detection signal, and on the basis that the photoelectric switch adopts a physical mode, namely a limiting block, a limiting hole and other shielding components to realize strong light interference resistance, the light transmittance of the photoelectric switch is greatly improved, and the photoelectric switch has good reliability. And the amplification factor of the amplification module can be set according to actual needs, so that the system has flexibility and can adapt to different application environments.

Example III

Referring to fig. 4, on the basis of the first embodiment or the second embodiment, the present embodiment further proposes a circuit for resisting strong light interference.

Further, as shown in fig. 4, a schematic circuit diagram of the alarm module is shown; the alarm module may include logic devices;

Specifically, the logic device is a device for performing logic judgment, and the logic device may include at least one of the following: exclusive or gate U3, and gate, and or gate.

In this embodiment, the logic device adopts the exclusive-or gate U3, the first input terminal C of the exclusive-or gate U3 is connected with the positive electrode of the photoelectric receiving tube D2, and receives the detection signal, the second input terminal D of the exclusive-or gate U3 is connected with the working voltage VCC through the resistor R8, for example, may be connected with a power circuit of the photoelectric switch, receives the voltage of 9V, and the output terminal K of the exclusive-or gate U3 is connected with the upper computer, and outputs the signal OUT2 to the upper computer.

Furthermore, the alarm module may further include a filtering unit, where the first input end of the logic device is connected to the positive electrode of the photoelectric receiving tube D2 through the filtering unit;

In this embodiment, the first input terminal C of the exclusive or gate U3 is connected to the positive electrode of the photo receiver tube D2 through a filtering unit.

Still further, the filtering unit may include a resistor R7 and a capacitor C7;

In this embodiment, one end of the resistor R7 and one end of the capacitor C7 are both connected to the first input terminal C of the exclusive or gate U3, and the other end of the resistor R7 is connected to the positive electrode of the photo receiver tube D2.

In practical application, when the photoelectric switch does not detect the object to be detected, the detection signal output by the positive electrode of the photoelectric receiving tube D2 is a high-frequency pulse, after the low-pass filtering processing of the filtering unit, the signal input to the first input end C of the exclusive or gate U3 is a high level, and the signal output by the output end K of the exclusive or gate U3, that is, the early warning judgment signal is a low level, so that no alarm can be given; when the photoelectric switch is not interfered by the outside but a detected object is detected, the output of the photoelectric receiving tube D2 is high level, the output of the exclusive OR gate U3 is low level, namely the early warning judgment signal is low level, and the alarm is not carried out; when the photoelectric switch is interfered by strong light, the photoelectric receiving tube D2 is completely conducted, the output of the photoelectric receiving tube D is low in level, the detection signal is connected to the exclusive-OR gate U3 after passing through the resistor R7 and the capacitor C7, after logic judgment, the output of the exclusive-OR gate U3 is high in level, and the early-warning judgment signal is given to an upper computer to give an alarm prompt.

According to the anti-strong light interference circuit, the output signal of the photoelectric receiving tube D2 is identified through the alarm module, logic judgment is carried out through the logic device, the situation that the photoelectric switch is subjected to strong light interference is distinguished according to the fact that the photoelectric switch is inconsistent with the output states in other states when the photoelectric switch is subjected to strong light interference, alarm prompt is carried out, the photoelectric switch is enabled to be more comprehensive in application, more practical needs are met, and good applicability is achieved.

Example IV

The embodiment provides a photoelectric switch, which can be connected with an upper computer, and specifically can include:

a photoemission module;

a photoelectric receiving module;

the photoelectric receiving module may include a signal receiving circuit, a signal processing circuit, and an anti-strong light interference circuit as in any of the first to third embodiments.

In the photoelectric receiving module, the signal processing circuit and the anti-strong light interference circuit are both connected with an upper computer. The signal processing circuit may be a post-stage amplifying circuit or a post-stage processing circuit, wherein the post-stage amplifying circuit may include a detection amplifying unit and a logic processing unit, and the post-stage processing circuit may include a single chip microcomputer and peripheral devices thereof.

In specific applications, the photoelectric emission module of the photoelectric switch may include a signal emission circuit, a power supply circuit, and the like, which may be specifically set according to actual needs, and will not be described herein.

It should be noted that, the specific structure of the anti-strong light interference circuit may refer to the above embodiments, and since the present embodiment adopts all the technical solutions of all the above embodiments, at least the technical solutions of the above embodiments have all the beneficial effects, which are not described in detail herein.

It should be noted that, the foregoing reference numerals of the embodiments of the present utility model are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments. The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings under the concept of the present utility model, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims

1. The utility model provides a strong light interference resistant circuit, its characterized in that is applied to photoelectric switch, photoelectric switch includes photoelectric emission module and photoelectric receiving module, photoelectric receiving module includes signal receiving circuit and signal processing circuit, strong light interference resistant circuit sets up signal receiving circuit with between the signal processing circuit, strong light interference resistant circuit includes:

the input end of the amplifying module is connected with the photoelectric receiving tube D2 of the signal receiving circuit, and the output end of the amplifying module is connected with the upper computer through the signal processing circuit;

the alarm module is used for generating an early warning judgment signal according to the detection signal output by the photoelectric receiving tube D2 and outputting the early warning judgment signal to the upper computer, wherein the early warning judgment signal is used for judging whether the photoelectric switch is interfered by strong light.

2. The anti-strong light interference circuit as set forth in claim 1, wherein the amplifying module is configured to amplify the detection signal and output an amplified signal to the signal processing circuit;

the amplifying module comprises an amplifier U2;

3. The anti-strong interference circuit of claim 2, wherein the amplifying module further comprises a resistor R4, a resistor R5;

4. A circuit as claimed in claim 3, wherein the amplification factor of the amplifier U2 is determined according to the parameters of the resistor R4, the resistor R5, the capacitor C5, the resistor R6 and the capacitor C6, and the amplification factor Y of the amplifier U2 is:

5. The anti-high light interference circuit of claim 1, wherein the alarm module comprises a logic device;

the first input end of the logic device is connected with the positive electrode of the photoelectric receiving tube D2, the second input end of the logic device is connected with working voltage through a resistor R8, and the output end of the logic device is connected with the upper computer.

6. The anti-strong light interference circuit according to claim 5, wherein the alarm module further comprises a filter unit, and the first input end of the logic device is connected with the positive electrode of the photoelectric receiving tube D2 through the filter unit;

7. The anti-strong-light interference circuit of claim 6, wherein the filter unit comprises a resistor R7 and a capacitor C7;

8. The anti-blooming circuit of claim 5 wherein said logic device comprises at least one of: exclusive or gate U3, and gate, and or gate.

9. The anti-strong light interference circuit according to claim 1, wherein the signal processing circuit comprises a post-stage amplifying circuit or a post-stage processing circuit, wherein the post-stage amplifying circuit comprises a detection amplifying unit and a logic processing unit, and the post-stage processing circuit comprises a single chip microcomputer and peripheral devices thereof.

10. An optoelectronic switch, characterized in that is connected with the host computer, the optoelectronic switch includes:

a photoemission module;

a photoelectric receiving module;

wherein the optoelectronic receiving module comprises the anti-strong light interference circuit as claimed in any one of claims 1 to 9, and a signal receiving circuit and a signal processing circuit.