Photoelectric sensor circuit shielding group pulse interference and photoelectric sensor circuit

Abstract

The utility model discloses a photoelectric sensor circuit and a photoelectric sensor for shielding group pulse interference, and relates to the field of sensor technology. It mainly solves the technical problem that the existing photoelectric sensors are easily interfered by group pulses. It mainly includes an integrated chip, a light-emitting device, a light-receiving device and an oscillating circuit; the infrared light-emitting pin of the integrated chip is connected to the light-emitting device and then grounded, the infrared receiving pin is connected to the light-receiving device and then grounded, the grounding pin is connected to the grounding terminal, and the integrated chip is connected to the oscillating circuit through its own power supply voltage pin; the input end of the oscillating circuit is connected to the power supply input end, and the output end is connected to the grounding terminal, which is used to shield the group pulse interference signal; the integrated chip is used to receive the feedback signal generated by the light-receiving device after being irradiated by the light-emitting device, and output an electrical signal based on the feedback signal, thereby improving the situation where the photoelectric sensor and the automation control equipment based on the photoelectric sensor detection signal are interfered by group pulses.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a photoelectric sensor circuit shielding group pulse interference and a photoelectric sensor circuit. Background Art

[0002] The photoelectric sensor circuit shielded from group pulse interference is a sensor that converts optical signals into electrical signals to detect the environment and objects. It is widely used in industrial automation, security monitoring, transportation, medical equipment, smart home and other fields. It brings more convenience and innovation to the development of various fields. In particular, the photoelectric sensor circuit shielded from group pulse interference plays a very important role in industrial automation equipment.

[0003] With the continuous development of industrial automation, more and more electronic components are integrated into industrial automation equipment, and many components (such as switches, relays, etc.) will generate transient pulse groups during operation. For example, if the inductive load is repeatedly switched, the pulse group will be repeated at corresponding time intervals. This pulse has the characteristics of short rise time, high repetition rate, low energy and wide spectrum distribution. Pulse group interference will reduce the performance of photoelectric sensors or even cause them to fail, which will cause industrial automation equipment that relies on photoelectric sensor circuits that shield group pulse interference to operate normally. Utility Model Content

[0004] In view of this, the utility model provides a photoelectric sensor circuit for shielding group pulse interference, the main purpose of which is to solve the technical problem that the existing photoelectric sensor is susceptible to group pulse interference.

[0005] To achieve the above-mentioned purpose, the utility model first provides a photoelectric sensor circuit and a photoelectric sensor that shields group pulse interference. According to one aspect of the utility model, the application provides a photoelectric sensor circuit that shields group pulse interference, including an integrated chip, a light-emitting device, a light-receiving device and an oscillation circuit;

[0006] The infrared light-emitting pin of the integrated chip is connected to the light-emitting device and then grounded, the infrared receiving pin is connected to the light-receiving device and then grounded, the grounding pin is connected to the ground terminal, and the integrated chip is connected to the oscillation circuit through its own power supply voltage pin;

[0007] The input end of the oscillation circuit is connected to the power input end, and the output end is connected to the ground end, so as to shield the group pulse interference signal;

[0008] The integrated chip is used to receive a feedback signal generated by the light-receiving device after being illuminated by the light-emitting device, and output an electrical signal based on the feedback signal.

[0009] Further, the oscillation circuit includes a current limiting resistor and an oscillation capacitor;

[0010] The first end of the current limiting resistor is connected to the power input end, and the second end is connected to the first end of the oscillation capacitor, and is used to limit the current flow and the charging and discharging speed of the capacitor to stabilize the circuit, and the power supply voltage pin of the integrated chip is connected between the current limiting resistor and the oscillation capacitor;

[0011] The second end of the oscillation capacitor is connected to the ground end and is used to filter high-frequency group pulse interference signals and reduce the pulse oscillation frequency in the circuit.

[0012] Furthermore, the circuit also includes a working indicator light;

[0013] The negative terminal of the working indicator light is connected to the working indicator light pin of the integrated chip, and the positive terminal is connected to the power supply voltage pin of the integrated chip, so as to indicate the working state of the light receiving device.

[0014] Furthermore, in a specific application scenario, the working indicator light is specifically used to light up when the light receiving device receives a light signal; and to turn off when the light receiving device does not receive a light signal.

[0015] Further, the integrated chip includes a first output pin and a second output pin;

[0016] When the first output pin outputs an optical low level signal, the second output pin outputs an optical high level signal; or,

[0017] In the case where the first output pin outputs a no-light high-level signal, the second output pin outputs a no-light low-level signal.

[0018] Furthermore, the input voltage range of the power supply voltage pin is 5V to 24V.

[0019] Furthermore, the electrical signal output by the integrated chip is used to characterize the position, size and color information of the detected object, as well as the surface defect information.

[0020] According to another aspect of the present application, a photoelectric sensor is provided, wherein the photoelectric sensor includes the above-mentioned photoelectric sensor circuit for shielding group pulse interference.

[0021] The utility model provides a photoelectric sensor circuit and a photoelectric sensor for shielding group pulse interference, the circuit includes: an integrated chip, a light emitting device, a light receiving device and an oscillating circuit; the infrared light emitting pin of the integrated chip is connected to the light emitting device and then grounded, the infrared receiving pin is connected to the light receiving device and then grounded, the ground pin is connected to the ground terminal, and the integrated chip is connected to the oscillating circuit through its own power supply voltage pin; the input end of the oscillating circuit is connected to the power supply input end, and the output end is connected to the ground terminal, which is used to shield the group pulse interference signal; the integrated chip is used to receive the feedback signal generated by the light receiving device after being irradiated by the light emitting device, and output an electrical signal based on the feedback signal. This circuit and the photoelectric sensor can shield the group pulse interference generated by the components around the photoelectric sensor through the oscillating circuit, avoid the power supply voltage input of the integrated chip carrying the group pulse interference signal, so that the light emitting device connected to the infrared light emitting pin of the integrated chip can normally send infrared light, and the light receiving device connected to the infrared receiving pin of the integrated chip can accurately receive the feedback signal generated after being irradiated by the light emitting device, thereby improving the anti-interference ability of the photoelectric sensor and ensuring the stable operation of the photoelectric sensor and the automation control equipment in which it is located.

[0022] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of the circuit structure of a photoelectric sensor circuit for shielding group pulse interference provided by an embodiment of the utility model is shown;

[0025] Figure 2 A schematic diagram of the circuit structure of another photoelectric sensor circuit for shielding group pulse interference provided by an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0027] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation methods, structures, features and effects of the utility model application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0028] Combine the following Figure 1 and Figure 2 Circuits according to some embodiments of the present invention are described.

[0029] In one embodiment, Figure 1 As shown, a photoelectric sensor circuit for shielding group pulse interference is provided, including an integrated chip 100, a light-emitting device 200, a light-receiving device 300 and an oscillation circuit 400; the infrared light-emitting pin of the integrated chip 100 is connected to the light-emitting device 200 and then grounded, the infrared receiving pin is connected to the light-receiving device 300 and then grounded, the ground pin is connected to the ground terminal, and the integrated chip 100 is connected to the oscillation circuit 400 through its own power supply voltage pin; the input terminal of the oscillation circuit 400 is connected to the power supply input terminal, and the output terminal is connected to the ground terminal, which is used to shield the group pulse interference signal; the integrated chip 100 is used to receive the feedback signal generated by the light-receiving device 300 after being irradiated by the light-emitting device 200, and output an electrical signal based on the feedback signal.

[0030] In the above embodiment, the integrated chip includes a power supply voltage pin VCC, an indicator light pin LED, an infrared light emitting pin IRED, an infrared receiving pin PTR, an empty pin NC and a ground pin GND. Among them, the power supply voltage pin VCC is connected to the oscillation circuit, the infrared receiving pin IRED is connected to the light emitting device and then grounded, the infrared receiving pin PTR is connected to the light receiving device and then grounded, and the ground pin GND is connected to the ground terminal. The input end of the oscillation circuit 400 is connected to the power input end, and the output end is connected to the ground end to avoid the interference of the group pulse interference signal to the integrated chip, thereby ensuring that the integrated chip can receive the feedback signal of the light receiving device and output the electrical signal corresponding to the feedback signal. The integrated chip is a chip that replaces the electrical circuit in the traditional photoelectric sensor and realizes the electrical characteristics of the photoelectric sensor. By using this integrated chip, the functions of a series of electronic devices such as multiple resistors, triodes, diodes, capacitors, etc. in the traditional circuit can be realized, thereby greatly reducing the space occupied by the circuit, thereby reducing the volume of the photoelectric sensor.

[0031] Working principle: By connecting the power supply voltage pin of the integrated chip to the oscillation circuit, the electrical signal input into the power supply voltage pin of the integrated chip can be filtered through the oscillation circuit, shielding the group pulse interference signal mixed therein, avoiding the interference signal from affecting the operation of the integrated chip, thereby ensuring that the integrated chip can control the light-emitting device to illuminate the light-receiving device, the light-receiving device can feed back the received light signal to the integrated chip, and the integrated chip can accurately output the electrical signal corresponding to the feedback light signal. This ensures the stable operation of the sensor.

[0032] It should be noted that the circuit function of the photoelectric sensor circuit for shielding group pulse interference provided by this embodiment is mainly realized by the circuit connection relationship between various circuit modules, and does not rely on the implementation of the program module in a certain circuit module. In addition, each circuit module in the photoelectric sensor circuit for shielding group pulse interference can be realized by an analog circuit or a digital circuit, and for the circuit module that can be implanted with a program module, the realization of its module function can be realized by the program module provided by the prior art.

[0033] In one embodiment, Figure 2 As shown, the oscillation circuit in the above-mentioned photoelectric sensor circuit for shielding group pulse interference includes a current limiting resistor and an oscillation capacitor; the first end of the current limiting resistor is connected to the power input terminal, and the second end is connected to the first end of the oscillation capacitor, which is used to limit the current flow and the charging and discharging speed of the capacitor to stabilize the circuit, and the power supply voltage pin of the integrated chip is connected between the current limiting resistor and the oscillation capacitor; the second end of the oscillation capacitor is connected to the ground terminal, which is used to filter the high-frequency group pulse interference signal and reduce the pulse oscillation frequency in the circuit.

[0034] Specifically, the oscillation circuit is an RC oscillation circuit composed of a capacitor and a resistor. One end of the current limiting resistor is connected to an input voltage of 5V to 24V, and the other end is connected to the oscillation capacitor and the power supply voltage pin of the integrated chip respectively. One end of the oscillation capacitor is connected to the current limiting resistor, and the other end is grounded. The current limiting resistor is used to limit the flow of current and stabilize the circuit, and control the charging and discharging speed of the oscillation capacitor; the oscillation capacitor derives the high-frequency group pulse interference signal in the input power supply from the ground terminal through the oscillation capacitor, and at the same time, cooperates with the current limiting resistor to reduce the oscillation frequency of the remaining pulses in the circuit. By connecting the power supply voltage VCC pin of the integrated chip between the current limiting resistor and the oscillation capacitor, the pulse oscillation signal of the voltage signal in the input integrated chip is as small as possible, thereby minimizing the impact of the group pulse interference signal on the working state of the integrated chip.

[0035] In one embodiment, Figure 2As shown, the above-mentioned photoelectric sensor circuit for shielding group pulse interference also includes a working indicator light; the negative end of the working indicator light is connected to the working indicator light pin of the integrated chip, and the positive end is connected to the power supply voltage pin of the integrated chip, which is used to indicate the working status of the light receiving device.

[0036] Specifically, the working indicator light is a light emitting diode, the positive end of which is connected to the power supply voltage pin of the integrated chip, and the negative end is connected to the working indicator light pin of the integrated chip. It is used to indicate whether the light receiving device receives the infrared light signal emitted by the light emitting element. By introducing the working indicator light, the light signal reception status of the light receiving device can be more intuitively displayed, thereby facilitating the control of the automation equipment and the monitoring of the working status of the light sensor.

[0037] In one embodiment, the working indicator light is specifically used to light up when the light receiving device receives a light signal; and to turn off when the light receiving device does not receive a light signal.

[0038] Specifically, when the light receiving device receives a light signal, the working indicator light is on, and when no light signal is received, the working indicator light is off. The light signal received by the light receiving device may be the original light signal emitted by all the light emitting devices, or may be the original light signal emitted by the light emitting device after being partially blocked by an object, which is not specifically limited in the embodiments of the utility model. According to the frequency of the working indicator light on and off, information such as the speed of the moving object and the position of the object can be determined. For example, for a photoelectric sensor used to detect the speed of an object on a conveyor belt, the shorter the time interval between two adjacent working indicator lights is, the faster the moving speed of the indicated object is. In addition, the operating status of the integrated chip can also be determined by the on and off status of the working indicator light. For example, if the working indicator light is continuously off, it is necessary to inspect the function of the integrated chip or the light emitting device.

[0039] In one embodiment, Figure 2 As shown, the integrated chip in the above-mentioned photoelectric sensor circuit for shielding group pulse interference also includes a first output pin and a second output pin; when the first output pin outputs a low-level signal with light, the second output pin outputs a high-level signal with light; or, when the first output pin outputs a high-level signal without light, the second output pin outputs a low-level signal without light.

[0040] Specifically, the integrated chip further includes a first output pin Vout1 and a second output pin Vout2. Both output pins have two different output forms, and the two output pins simultaneously output signals in different forms. When the first output pin outputs a low-level signal with light, the second output pin outputs a high-level signal with light; when the first output pin outputs a high-level signal without light, the second output pin outputs a low-level signal without light. By selecting different output level signals, the needs of different devices and application scenarios can be met.

[0041] In one embodiment, the input voltage range of the power supply voltage pin of the integrated chip of the above-mentioned photoelectric sensor circuit shielded from group pulse interference is 5V to 24V.

[0042] Specifically, the power supply voltage pin of the integrated chip can input a DC signal with a voltage range of 5V to 24V, that is, the input voltage of the photoelectric sensor is 5V to 24V. Since the photoelectric sensor has a wide input voltage range, it has a wider range of use for the access power supply, which can improve the compatibility and applicability of application scenarios.

[0043] In the above embodiment, the electrical signal output by the integrated chip of the above-mentioned photoelectric sensor circuit shielded from group pulse interference is used to characterize the position, size and color information, and surface defect information of the detected object.

[0044] Specifically, the electrical signal output by the integrated chip is the electrical signal output by the photoelectric sensor. This photoelectric sensor can be widely used in multiple automated detection scenarios and automated equipment. For example, when an object passes through the range of the light signal emitted by the photoelectric sensor, the light signal received by the light receiving device changes, and the position of the object can be detected; the length of time that the light receiving device does not receive the light signal can be used to detect the size of the object; the color and surface defects of the object can be detected by the change in the intensity of the light signal received by the light receiving device.

[0045] The utility model provides a photoelectric sensor circuit for shielding group pulse interference, the circuit includes: an integrated chip, a light emitting device, a light receiving device and an oscillating circuit; the infrared light emitting pin of the integrated chip is connected to the light emitting device and then grounded, the infrared receiving pin is connected to the light receiving device and then grounded, the ground pin is connected to the ground terminal, and the integrated chip is connected to the oscillating circuit through its own power supply voltage pin; the input end of the oscillating circuit is connected to the power supply input end, and the output end is connected to the ground terminal, which is used to shield the group pulse interference signal; the integrated chip is used to receive the feedback signal generated by the light receiving device after being irradiated by the light emitting device, and output an electrical signal based on the feedback signal. This circuit and the photoelectric sensor can shield the group pulse interference generated by the components around the photoelectric sensor through the oscillating circuit, avoid the power supply voltage input of the integrated chip carrying the group pulse interference signal, so that the light emitting device connected to the infrared light emitting pin of the integrated chip can normally send infrared light, and the light receiving device connected to the infrared receiving pin of the integrated chip can accurately receive the feedback signal generated after being irradiated by the light emitting device, thereby improving the anti-interference ability of the photoelectric sensor and ensuring the stable operation of the photoelectric sensor and the automation control equipment in which it is located. Specific embodiment:

[0047] In one embodiment, Figure 1 As shown, a photoelectric sensor circuit for shielding group pulse interference is provided, including an integrated chip 100, a light-emitting device 200, a light-receiving device 300 and an oscillating circuit 400; the infrared light-emitting pin of the integrated chip 100 is connected to the light-emitting device 200 and then grounded, the infrared receiving pin is connected to the light-receiving device 300 and then grounded, the ground pin is connected to the ground terminal, and the integrated chip 100 is connected to the oscillating circuit 400 through its own power supply voltage pin; the input end of the oscillating circuit 400 is connected to the power supply input end, and the output end is connected to the ground terminal, which is used to shield the group pulse interference signal; the integrated chip 100 is used to receive the feedback signal generated by the light-receiving device 300 after being irradiated by the light-emitting device 200, and output an electrical signal based on the feedback signal. Among them, the input voltage range of the power supply voltage pin is 5V to 24V.

[0048] In this embodiment, the photoelectric sensor circuit shielding group pulse interference also includes a working indicator light; the negative terminal of the working indicator light is connected to the working indicator light pin of the integrated chip, and the positive terminal is connected to the power supply voltage pin of the integrated chip, which is used to indicate the working state of the light receiving device. The working indicator light is specifically used to light up when the light receiving device receives an optical signal; and to turn off when the light receiving device does not receive an optical signal.

[0049] In this embodiment, the integrated chip in the photoelectric sensor circuit for shielding group pulse interference also includes a first output pin and a second output pin; when the first output pin outputs a low-level light signal, the second output pin outputs a high-level light signal; or, when the first output pin outputs a high-level light signal, the second output pin outputs a low-level light signal.

[0050] In this embodiment, the electrical signal output by the integrated chip of the photoelectric sensor circuit shielded from group pulse interference is used to characterize the position, size and color information of the detected object, as well as the surface defect information.

[0051] Working principle: By connecting the power supply voltage pin of the integrated chip to the oscillation circuit, the electrical signal input into the power supply voltage pin of the integrated chip can be filtered through the oscillation circuit, shielding the group pulse interference signal mixed therein, avoiding the interference signal from affecting the operation of the integrated chip, thereby ensuring that the integrated chip can control the light-emitting device to illuminate the light-receiving device, the light-receiving device can feed back the received light signal to the integrated chip, and the integrated chip can accurately output the electrical signal corresponding to the feedback light signal. This ensures the stable operation of the sensor.

[0052] The utility model provides a photoelectric sensor circuit for shielding group pulse interference, which includes: an integrated chip, a light-emitting device, a light-receiving device and an oscillating circuit; the infrared light-emitting pin of the integrated chip is connected to the light-emitting device and then grounded, the infrared receiving pin is connected to the light-receiving device and then grounded, the grounding pin is connected to the grounding terminal, and the integrated chip is connected to the oscillating circuit through its own power supply voltage pin; the input end of the oscillating circuit is connected to the power supply input end, and the output end is connected to the grounding terminal, which is used to shield the group pulse interference signal; the integrated chip is used to receive the feedback signal generated by the light-receiving device after being irradiated by the light-emitting device, and output an electrical signal based on the feedback signal. This circuit and the photoelectric sensor can shield the group pulse interference generated by the components around the photoelectric sensor through the oscillating circuit, avoid the power supply voltage input of the integrated chip carrying the group pulse interference signal, so that the light-emitting device connected to the infrared light-emitting pin of the integrated chip can normally send infrared light, and the light-receiving device connected to the infrared receiving pin of the integrated chip can accurately receive the feedback signal generated after being irradiated by the light-emitting device, thereby improving the anti-interference ability of the photoelectric sensor and ensuring the stable operation of the photoelectric sensor and the automation control equipment in which it is located.

[0053] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A photoelectric sensor circuit shielded from group pulse interference, characterized in that: The circuit comprises: an integrated chip, a light emitting device, a light receiving device and an oscillating circuit; The infrared light-emitting pin of the integrated chip is connected to the light-emitting device and then grounded, the infrared receiving pin is connected to the light-receiving device and then grounded, the grounding pin is connected to the ground terminal, and the integrated chip is connected to the oscillation circuit through its own power supply voltage pin; The input end of the oscillation circuit is connected to the power input end, and the output end is connected to the ground end, so as to shield the group pulse interference signal; The integrated chip is used to receive a feedback signal generated by the light-receiving device after being illuminated by the light-emitting device, and output an electrical signal based on the feedback signal.

2. The circuit according to claim 1, characterized in that The oscillation circuit comprises a current limiting resistor and an oscillation capacitor; The first end of the current limiting resistor is connected to the power input end, and the second end is connected to the first end of the oscillation capacitor, and is used to limit the current flow and the charging and discharging speed of the capacitor to stabilize the circuit, and the power supply voltage pin of the integrated chip is connected between the current limiting resistor and the oscillation capacitor; The second end of the oscillation capacitor is connected to the ground end and is used to filter high-frequency group pulse interference signals and reduce the pulse oscillation frequency in the circuit.

3. The circuit according to claim 2, characterized in that The circuit also includes a working indicator light; The negative terminal of the working indicator light is connected to the working indicator light pin of the integrated chip, and the positive terminal is connected to the power supply voltage pin of the integrated chip, so as to indicate the working state of the light receiving device.

4. The circuit according to claim 3, characterized in that The working indicator light is specifically used to light up when the light receiving device receives a light signal; and to turn off when the light receiving device does not receive a light signal.

5. The circuit according to any one of claims 1 to 4, characterized in that: The integrated chip further comprises a first output pin and a second output pin; When the first output pin outputs an optical low level signal, the second output pin outputs an optical high level signal; or, In the case where the first output pin outputs a no-light high-level signal, the second output pin outputs a no-light low-level signal.

6. The circuit according to claim 1, characterized in that The input voltage range of the power supply voltage pin is 5V to 24V.

7. The circuit according to any one of claims 1 to 4 or 6, characterized in that: The electrical signal output by the integrated chip is used to characterize the position, size and color information of the detected object, as well as the surface defect information.

8. A photoelectric sensor, characterized in that: The photoelectric sensor comprises the photoelectric sensor circuit shielded from group pulse interference according to any one of claims 1 to 7.

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