CN219612077U - Anti-interference circuit applied to light curtain - Google Patents
Anti-interference circuit applied to light curtain Download PDFInfo
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- CN219612077U CN219612077U CN202223439152.0U CN202223439152U CN219612077U CN 219612077 U CN219612077 U CN 219612077U CN 202223439152 U CN202223439152 U CN 202223439152U CN 219612077 U CN219612077 U CN 219612077U
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Abstract
The utility model discloses an anti-interference circuit applied to a light curtain, which comprises a diode, a voltage generating circuit, a first-stage integral amplifying circuit, a high-pass filter circuit and a second-stage integral amplifying circuit, wherein the diode is connected with a first power supply signal; the diode is used for receiving infrared light signals emitted by the light curtain transmitting end; the voltage generation circuit is connected with the diode and is used for converting a current signal generated by the diode into a voltage signal; one end of the primary integral amplifying circuit is connected with the voltage generating circuit, and the other end of the primary integral amplifying circuit is connected with the secondary integral amplifying circuit through a high-pass filter circuit; the first-stage integral amplifying circuit is used for carrying out first-stage amplification on the amplitude of the voltage signal generated by the voltage to a first amplitude, and the second-stage integral amplifying circuit is used for carrying out second-stage amplification on the amplitude of the signal passing through the high-pass filtering circuit to a second amplitude, wherein the second amplitude is larger than the first amplitude.
Description
Technical Field
The present utility model relates to a light curtain receiving circuit, and more particularly, to an anti-interference circuit applied to a light curtain.
Background
With the continuous development of light curtain technology, the light curtain is applied to some places such as dangerous equipment, sensing doors, security protection, elevators, channels and the like which work cooperatively by human and machine. In the security check correlation light curtain, whether shielding exists is judged under the condition that a diode at a transmitting end transmits a light signal and a diode at a receiving end receives a signal. When the light curtain is interfered by some ambient light sources (such as direct sunlight, reflective marble floor tiles, unstable incandescent lamp irradiation and the like during outdoor use), the light signal sent to the receiving end by the transmitting end can be influenced by ambient light to cause that the waveform of the light signal emitted by the transmitting end is covered by most, so that the identifiable signal amplitude of the receiving end is reduced, and the normal judgment of the shielding state of the light curtain is influenced, so that the normal use of security inspection equipment is influenced.
Disclosure of Invention
Aiming at the prior art, the utility model solves the technical problem of providing an anti-interference circuit for improving the amplitude of a received light signal to inhibit the influence of ambient interference light on the amplitude of the received light curtain signal.
In order to solve the technical problems, the utility model provides an anti-interference circuit applied to a light curtain, which comprises a diode, a voltage generating circuit, a first-stage integral amplifying circuit, a high-pass filter circuit and a second-stage integral amplifying circuit which are all connected with a first power supply signal; the diode is used for receiving infrared light signals emitted by the light curtain transmitting end; the voltage generation circuit is connected with the diode and is used for converting a current optical signal received by the diode into a voltage signal; one end of the primary integral amplifying circuit is connected with the voltage generating circuit, and the other end of the primary integral amplifying circuit is connected with the secondary integral amplifying circuit through a high-pass filter circuit; the first-stage integral amplifying circuit is used for carrying out first-stage amplification on the amplitude of the generated voltage signal of the voltage generating circuit to a first amplitude value, and the second-stage integral amplifying circuit is used for carrying out second-stage amplification on the amplitude of the signal passing through the high-pass filtering circuit to a second amplitude value, wherein the second amplitude value is larger than the first amplitude value.
In an embodiment of the present application, the voltage generating circuit includes a triode, a first resistor, a second resistor, and a third resistor; the base electrode of the triode is grounded through the first resistor, is connected with the anode of the diode through a first capacitor, and is connected with the collector electrode of the triode through the second resistor; the collector electrode of the triode is grounded through the third resistor and the second capacitor in sequence, and the joint of the third resistor and the second capacitor is connected to a first power supply signal; the emitter of the triode is grounded; the cathode of the diode is connected with the first power supply signal, and the anode of the diode is connected with a grounding resistor.
In an embodiment of the application, the first-stage integrating amplifying circuit includes a first operational amplifier, a fourth resistor and a third capacitor; the non-inverting input end of the first operational amplifier is grounded; an inverting input of the first operational amplifier is coupled to the voltage generation circuit; the output end of the first operational amplifier is connected with the high-pass filter circuit, the negative power supply end of the first operational amplifier is grounded, the positive power supply end of the first operational amplifier is connected with a first power supply signal, and the fourth resistor and the third capacitor are connected in parallel with the inverting input end of the first operational amplifier and the output end of the first operational amplifier.
In an embodiment of the present utility model, the inverting input terminal of the first operational amplifier and the voltage generating circuit are coupled through a coupling capacitor.
In an embodiment of the application, the high-pass filter circuit includes a fourth capacitor and a fifth resistor that are connected to each other, one end of the fourth capacitor is coupled to the output end of the first-stage integrating and amplifying circuit, and the other end of the fourth capacitor is connected to the fifth resistor that is grounded, and a junction between the fourth capacitor and the fifth resistor is connected to the input end of the second-stage integrating and amplifying circuit.
In an embodiment of the application, the second-stage integrating amplifying circuit includes a second operational amplifier, a fifth capacitor, a sixth resistor and a seventh resistor; the non-inverting input end of the second operational amplifier is connected with the high-pass filter circuit; the inverting input end of the second operational amplifier is connected with a grounded sixth resistor, and the positive power end of the second operational amplifier is connected with a first power signal; the negative power supply of the second operational amplifier is grounded; the fifth capacitor and the seventh resistor are connected in parallel with the inverting input end of the second operational amplifier and the output end of the second operational amplifier, and signals of the output end of the second operational amplifier are output through a coupling capacitor.
The anti-interference light receiving circuit provided by the utility model has the beneficial effects that: the current light signal emitted by the diode of the light curtain emitting end is converted into a voltage signal through the voltage generating circuit, the voltage signal is subjected to primary amplification through the primary integrating and amplifying circuit, interference signal filtering processing is performed through the high-pass filtering circuit, and the signal after primary amplification and filtering is subjected to secondary amplification through the secondary integrating circuit. Therefore, the anti-interference light receiving circuit can amplify the photocurrent signal emitted by the diode at the light curtain emitting end so as to improve the amplitude of the received light signal, thereby inhibiting the influence of the environment interference light on the amplitude of the received light curtain signal and inhibiting the influence of the environment interference light on the light curtain judgment shielding phenomenon.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an anti-interference circuit applied to a light curtain according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of an anti-interference circuit applied to a light curtain according to an embodiment of the present utility model.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are 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 one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The anti-interference circuit applied to the light curtain is specifically described with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2 in combination, the anti-interference light receiving circuit provided by the embodiment of the utility model is arranged at the receiving end of the security check opposite light curtain and is used for receiving the infrared light beam emitted by the diode at the emitting end of the security check opposite light curtain and strengthening the received light beam signal.
The anti-interference light receiving circuit comprises a diode, a voltage generating circuit, a first-stage integrating amplifying circuit, a high-pass filtering circuit and a second-stage integrating amplifying circuit which are all connected with a first power supply signal. Specifically, the diode is used for receiving an infrared light signal emitted by the light curtain transmitting end; the voltage generation circuit is connected with the diode and is used for converting a current optical signal received by the diode into a voltage signal; one end of the primary integral amplifying circuit is connected with the voltage generating circuit, and the other end of the primary integral amplifying circuit is connected with the secondary integral amplifying circuit through a high-pass filter circuit; the first-stage integral amplifying circuit is used for carrying out first-stage amplification on the amplitude of the generated voltage signal of the voltage generating circuit to a first amplitude value, and the second-stage integral amplifying circuit is used for carrying out second-stage amplification on the amplitude of the signal passing through the high-pass filtering circuit to a second amplitude value, wherein the second amplitude value is larger than the first amplitude value.
Referring further to fig. 1 and 2 in combination, the voltage generating circuit includes a transistor Q3, a first resistor R31, a second resistor R28, and a third resistor R27.
Specifically, the base of the triode Q3 is grounded through the first resistor R31, the base of the triode Q3 is connected to the anode of the diode D5 through the first capacitor C30, and the base of the triode Q3 is connected to the collector of the triode Q3 through the second resistor R28. The collector of the triode Q3 is grounded through the third resistor R27 and the second capacitor C25 in sequence, and the joint of the third resistor R27 and the second capacitor C25 is connected to a first power supply signal. The emitter of the triode Q3 is grounded; the cathode of the diode D5 is connected to the first power signal and the anode of the diode D5 is connected to a ground resistor R30. Wherein the first power supply signal is +5V voltage.
Referring further to fig. 1 and 2 in combination, the first stage integrating amplifying circuit includes a first operational amplifier U7A, a fourth resistor R26, and a third capacitor C24.
The non-inverting input terminal of the first operational amplifier U7A is grounded. The inverting input terminal of the first operational amplifier U7A is coupled to the voltage generating circuit, specifically, the inverting input terminal of the first operational amplifier U7A and the voltage generating circuit are coupled through a coupling capacitor C28; more specifically, the inverting input terminal of the first operational amplifier U7A and the collector of the transistor Q3 of the voltage generating circuit are coupled through this coupling capacitance C28. The output end of the first operational amplifier U7A is connected with the high-pass filter circuit. The negative power supply end of the first operational amplifier U7A is grounded, and the positive power supply end of the first operational amplifier U7A is connected with a first power supply signal. Both the fourth resistor R26 and the third capacitor C24 are connected in parallel to the inverting input terminal of the first operational amplifier U7A and the output terminal of the first operational amplifier U7A.
Referring further to fig. 1 and 2 in combination, the high pass filter circuit includes a fourth capacitor C29 and a fifth resistor R29 connected to each other.
One end of the fourth capacitor C29 is coupled to the output end of the first-stage integrating amplifying circuit, specifically, one end of the fourth capacitor C29 is coupled to the output end of the first operational amplifier U7A in the first-stage integrating amplifying circuit, and the other end of the fourth capacitor C29 is connected to the fifth resistor R29 that is grounded. The junction of the fourth capacitor C29 and the fifth resistor R29 is connected to the input end of the two-stage integrating amplifying circuit. It should be noted that, if the frequency of the optical signal sent by the optical curtain sending end is about 5KHZ, other low-frequency signals lower than 5KHZ are filtered by the high-pass filter circuit, and the interference signal is further filtered, and the cut-off frequency of the high-pass filter is related to the capacitance value of the fourth capacitor C29 and the resistance value of the fifth resistor R29, and the actual application process can be designed according to the requirement.
Referring to fig. 1 and 2 in combination, the two-stage integrating amplifying circuit includes a second operational amplifier U7B, a fifth capacitor C32, a sixth resistor R33, and a seventh resistor R32.
The non-inverting input end of the second operational amplifier U7B is connected to the high-pass filter circuit, specifically, the non-inverting input end of the second operational amplifier U7B is connected to a position where the fourth capacitor C29 and the fifth resistor R29 are connected. The inverting input end of the second operational amplifier U7B is connected with a grounded sixth resistor R33; the positive power end of the second operational amplifier U7B is connected with a first power signal; the negative power supply of the second operational amplifier U7B is grounded. The fifth capacitor C32 and the seventh resistor R32 are connected in parallel to the inverting input terminal of the second operational amplifier U7B and the output terminal of the second operational amplifier U7B, and the signal of the output terminal of the second operational amplifier U7B is output through a coupling capacitor C31.
In the present embodiment, the first power signal is +5v voltage, and the first operational amplifier U7A and the second operational amplifier U7B may be an operational amplifier with model LM358, but is not limited thereto. The parameters of the respective components of the diode D5, the voltage generating circuit, the first-stage integrating amplifying circuit, the high-pass filtering circuit for attenuating the low-frequency signal, and the second-stage integrating amplifying circuit may not be limited to those shown in fig. 2.
In the anti-interference light receiving circuit, a current light signal emitted by a diode D5 at a light curtain emitting end is converted into a voltage signal through a voltage generating circuit, the voltage signal is subjected to primary amplification through a primary integration amplifying circuit, interference signal filtering processing is performed through a high-pass filtering circuit, and the signal subjected to primary amplification and filtering is amplified again through a secondary integration circuit. Therefore, the anti-interference light receiving circuit can amplify the photocurrent signal emitted by the diode D5 at the light curtain emitting end so as to improve the amplitude of the received light signal, thereby inhibiting the influence of the environment interference light on the amplitude of the received light curtain signal and inhibiting the influence of the environment interference light on the light curtain judgment shielding phenomenon.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (6)
1. The anti-interference circuit applied to the light curtain is characterized by comprising a diode, a voltage generating circuit, a first-stage integral amplifying circuit, a high-pass filter circuit and a second-stage integral amplifying circuit which are all connected with a first power supply signal; the diode is used for receiving infrared light signals emitted by the light curtain transmitting end; the voltage generation circuit is connected with the diode and is used for converting a current optical signal received by the diode into a voltage signal; one end of the primary integral amplifying circuit is connected with the voltage generating circuit, and the other end of the primary integral amplifying circuit is connected with the secondary integral amplifying circuit through a high-pass filter circuit; the first-stage integral amplifying circuit is used for carrying out first-stage amplification on the amplitude of the voltage signal generated by the voltage to a first amplitude, and the second-stage integral amplifying circuit is used for carrying out second-stage amplification on the amplitude of the signal passing through the high-pass filtering circuit to a second amplitude, wherein the second amplitude is larger than the first amplitude.
2. The anti-interference circuit for a light curtain of claim 1, wherein the voltage generating circuit comprises a triode, a first resistor, a second resistor and a third resistor; the base electrode of the triode is grounded through the first resistor, is connected with the anode of the diode through a first capacitor, and is connected with the collector electrode of the triode through the second resistor; the collector electrode of the triode is grounded through the third resistor and the second capacitor in sequence, and the joint of the third resistor and the second capacitor is connected to a first power supply signal; the emitter of the triode is grounded; the cathode of the diode is connected with the first power supply signal, and the anode of the diode is connected with a grounding resistor.
3. The anti-interference circuit for a light curtain as claimed in claim 1, wherein the first-stage integrating amplifying circuit comprises a first operational amplifier, a fourth resistor and a third capacitor; the non-inverting input end of the first operational amplifier is grounded; an inverting input of the first operational amplifier is coupled to the voltage generation circuit; the output end of the first operational amplifier is connected with the high-pass filter circuit, the negative power supply end of the first operational amplifier is grounded, the positive power supply end of the first operational amplifier is connected with a first power supply signal, and the fourth resistor and the third capacitor are connected in parallel with the non-inverting input end of the first operational amplifier and the output end of the first operational amplifier.
4. The anti-tamper circuit for a light curtain of claim 3, wherein the inverting input of the first operational amplifier and the voltage generation circuit are coupled by a coupling capacitor.
5. The anti-interference circuit for a light curtain according to claim 1, wherein the high-pass filter circuit comprises a fourth capacitor and a fifth resistor which are connected with each other, one end of the fourth capacitor is coupled with the output end of the first-stage integrating amplifying circuit, the other end of the fourth capacitor is connected with the fifth resistor which is grounded, and the connection part of the fourth capacitor and the fifth resistor is connected with the input end of the second-stage integrating amplifying circuit.
6. The anti-interference circuit for a light curtain as claimed in claim 1, wherein the second-stage integrating amplifying circuit comprises a second operational amplifier, a fifth capacitor, a sixth resistor and a seventh resistor; the non-inverting input end of the second operational amplifier is connected with the high-pass filter circuit; the inverting input end of the second operational amplifier is connected with a grounded sixth resistor, and the positive power end of the second operational amplifier is connected with a first power signal; the negative power supply of the second operational amplifier is grounded; the fifth capacitor and the seventh resistor are connected in parallel with the inverting input end of the second operational amplifier and the output end of the second operational amplifier, and signals of the output end of the second operational amplifier are output through a coupling capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223439152.0U CN219612077U (en) | 2022-12-21 | 2022-12-21 | Anti-interference circuit applied to light curtain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223439152.0U CN219612077U (en) | 2022-12-21 | 2022-12-21 | Anti-interference circuit applied to light curtain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219612077U true CN219612077U (en) | 2023-08-29 |
Family
ID=87744610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223439152.0U Active CN219612077U (en) | 2022-12-21 | 2022-12-21 | Anti-interference circuit applied to light curtain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219612077U (en) |
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2022
- 2022-12-21 CN CN202223439152.0U patent/CN219612077U/en active Active
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