Reflective optoelectronic sensor and circuit

Abstract

This invention provides a reflective photoelectric sensor and circuit, relating to the field of photoelectric sensor technology. It includes a power management module, an infrared sensing module, and a working status indication module. The power management module converts a preset voltage into a working voltage for power supply. The infrared receiving chip is connected to an infrared LED via a voltage output adjustment unit, which provides a pulse voltage to the LED and adjusts its luminous intensity. The working status indication module includes an indicator light. This circuit supports wide voltage input, improving the product's versatility and applicability. The voltage output adjustment unit dynamically adjusts the luminous intensity of the infrared LED according to environmental changes, thereby improving detection accuracy and applicability. Furthermore, using a pulse voltage to drive the infrared LED helps reduce power consumption, heat generation, and improve anti-interference capabilities. The indicator light reflects the sensor's status, providing a clear understanding of its operation and facilitating debugging and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of photoelectric sensor technology, and in particular to a reflective photoelectric sensor and circuit. Background Technology

[0002] With the development of intelligent devices, non-contact sensors are becoming increasingly important in daily life and industrial applications. Among them, reflective sensors meet the market's demand for high-precision detection due to their high accuracy, stability, anti-interference ability, and lack of limitation on the material of the object being detected.

[0003] In the existing technology, reflective photoelectric sensors are usually only applicable to a specific voltage range and cannot work stably over a wider voltage range. Furthermore, photoelectric sensors typically use a fixed current to drive infrared LEDs, resulting in unadjustable light intensity and insufficient detection sensitivity. In addition, users cannot intuitively determine whether the photoelectric sensor is in normal working condition, which is not conducive to equipment debugging and troubleshooting. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a reflective photoelectric sensor and circuit, which solves the technical problems of traditional reflective photoelectric sensors that are only applicable to a specific voltage range, have a single driving method, cannot adjust the light intensity, and cannot timely understand their working status.

[0005] This utility model provides a reflective photoelectric sensor circuit, including a power management module, an infrared sensing module, and a working status indication module;

[0006] The power management module is used to convert the preset voltage into the working voltage, and output the working voltage to the infrared sensing module and the working status indicator module respectively for power supply;

[0007] The infrared sensing module includes an infrared light-emitting diode, an infrared receiving chip, and a voltage output regulation unit. The output terminal of the power management module is connected to the anode of the infrared light-emitting diode and the power input port of the infrared receiving chip, respectively. The first output port of the infrared receiving chip is connected to the cathode of the infrared light-emitting diode through the voltage output regulation unit. The infrared receiving chip provides a pulse voltage to the infrared light-emitting diode and adjusts the light intensity of the infrared light-emitting diode through the voltage output regulation unit.

[0008] The working status indication module includes an indicator light, the input terminal of which is connected to the output terminal of the power management module and the second output port of the infrared receiving chip, respectively.

[0009] Optionally, the power management module includes a low-dropout linear regulator, a first resistor, and a second resistor. An external power supply is connected to a first terminal of the first resistor, a second terminal of the first resistor is connected to a first terminal of the second resistor, and a second terminal of the second resistor is connected to the power port of the low-dropout linear regulator to provide a preset voltage to the low-dropout linear regulator. The second terminal of the first resistor is also connected to the enable port of the low-dropout linear regulator. The ground port of the low-dropout linear regulator is connected to a ground terminal. The output port of the low-dropout linear regulator is connected to the anode of the infrared LED, the power input port of the infrared receiver chip, and the input terminal of the indicator light, respectively. The low-dropout linear regulator is used to convert the preset voltage into a working voltage and output the working voltage to power the infrared LED, the infrared receiver chip, and the indicator light.

[0010] Optionally, the power management module further includes a first capacitor, a second capacitor, a first diode, and a second diode; an external power supply is connected to the cathode of the first diode, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to a ground terminal; the second terminal of the first resistor is connected to the first terminal of the first capacitor, and the second terminal of the first capacitor is connected to the anode of the second diode; the output port of the low-dropout linear regulator is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the anode of the second diode.

[0011] Optionally, the preset voltage is 5-24V, and the operating voltage is 5V.

[0012] Optionally, the voltage output adjustment unit includes a first transistor and a third resistor; the base of the first transistor is connected to the first output port of the infrared receiving chip, the collector of the first transistor is connected to the cathode of the infrared light-emitting diode, the emitter of the first transistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the ground terminal, wherein the resistance value of the third resistor is adjustable.

[0013] Optionally, the working status indication module further includes a signal output unit; the output terminal of the indicator light is connected to the signal output unit, and the working status of the indicator light and the signal output unit is controlled based on the level signal output by the infrared receiving chip.

[0014] Optionally, when an object is present within the preset detection range of the infrared receiving chip, the infrared receiving chip receives the infrared light emitted by the infrared LED reflected by the object and outputs a high-level signal, the indicator light illuminates, and the signal output unit outputs a low-level signal; when no object is present within the preset detection range of the infrared receiving chip, the infrared receiving chip outputs a low-level signal, the indicator light turns off, and the signal output unit outputs a high-level signal.

[0015] Optionally, the signal output unit includes a second transistor, a third diode, and a signal output port; the output terminal of the indicator light is connected to the base of the second transistor, the emitter of the second transistor is connected to the ground terminal, and the collector of the second transistor is connected to the signal output port; the anode of the third diode is connected to the ground terminal, and the cathode of the third diode is connected to the signal output port.

[0016] Optionally, the operating status indicator module further includes a fourth resistor; the output terminal of the power management module is connected to the input terminal of the indicator light through the fourth resistor.

[0017] Another aspect of this utility model provides a reflective photoelectric sensor, including a PLC and the reflective photoelectric sensor described in any one of the above claims;

[0018] The PLC and the reflective photoelectric sensor circuit are connected in a control manner.

[0019] The reflective photoelectric sensor and circuit provided by this utility model features a power management module that supports wide voltage input and converts it to a stable operating voltage, making it suitable for various power supply environments and improving the product's versatility and applicability. Furthermore, the power management module provides unified power to multiple sub-modules, enhancing system integration and stability. A voltage output adjustment unit controls the luminous intensity of the infrared LED, allowing it to dynamically adjust according to environmental changes, thereby improving detection accuracy and applicability. The use of an infrared receiving chip to provide pulse voltage to drive the infrared LED helps reduce power consumption, heat generation, and to some extent, improves anti-interference capabilities. The operating status indicator module reflects the sensor's status via indicator lights, allowing users to intuitively understand the operating conditions and facilitating debugging and maintenance.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0021] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 A schematic diagram of the overall structure of a reflective photoelectric sensor circuit in one embodiment of this application;

[0024] Figure 2 A schematic diagram of the specific circuit structure of a reflective photoelectric sensor circuit in one embodiment of this application is provided.

[0025] In the picture:

[0026] R1, the first resistor; R2, the second resistor; R3, the third resistor; R4, the fourth resistor;

[0027] D1, first diode; D2, second diode; D3, third diode;

[0028] C1, the first capacitor; C2, the second capacitor;

[0029] Tr, the first transistor; DTr, the second transistor;

[0030] VCC, external power supply; Vout, signal output port;

[0031] IRED (Infrared Light Emitting Diode); LED (Indicator Light);

[0032] LDO, Low Dropout Linear Regulator; VI, Power Port; GND, Ground Port; EN, Enable Port; Output Port, VO;

[0033] IC, infrared receiver chip; LED OUT, first output port; OUT, second output port; GND, ground port; Vcc, power input port. Detailed Implementation

[0034] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0035] In one embodiment, such as Figure 1 and Figure 2As shown, a reflective photoelectric sensor circuit is provided, including a power management module, an infrared sensing module, and a working status indication module. The power management module converts a preset voltage into a working voltage and outputs the working voltage to the infrared sensing module and the working status indication module for power supply. The infrared sensing module includes an infrared light-emitting diode (IRED), an infrared receiver chip (IC), and a voltage output adjustment unit. The output terminal of the power management module is connected to the anode of the infrared light-emitting diode (IRED) and the power input port Vcc of the infrared receiver chip (IC), respectively. The first output port LED OUT of the infrared receiver chip (IC) is connected to the cathode of the infrared light-emitting diode (IRED) through the voltage output adjustment unit. The infrared receiver chip (IC) provides a pulse voltage to the infrared light-emitting diode (IRED) and adjusts the luminous intensity of the infrared light-emitting diode (IRED) through the voltage output adjustment unit. The working status indication module includes an indicator LED, the input terminal of which is connected to the output terminal of the power management module and the second output port OUT of the infrared receiver chip (IC), respectively.

[0036] The reflective photoelectric sensor circuit provided in this embodiment features a power management module that supports wide voltage input and converts it to a stable operating voltage, making it suitable for various power supply environments. This enhances the product's versatility and applicability. Furthermore, the power management module provides unified power to multiple sub-modules, improving system integration and stability. A voltage output adjustment unit controls the luminous intensity of the infrared LED (IRED), allowing it to dynamically adjust according to environmental changes, thereby improving detection accuracy and applicability. The use of an infrared receiver chip IC to provide pulse voltage to drive the IRED helps reduce power consumption, heat generation, and to some extent, improves anti-interference capabilities. The operating status indicator module uses LEDs to reflect the sensor's status, allowing users to intuitively understand its operation and facilitating debugging and maintenance.

[0037] In one embodiment, such as Figure 2As shown, the power management module includes a low-dropout linear regulator (LDO), a first resistor R1, and a second resistor R2. An external power supply VCC is connected to the first terminal of the first resistor R1, and the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2 is connected to the power port VI of the LDO, providing a preset voltage to the LDO. The second terminal of the first resistor R1 is also connected to the enable port EN of the LDO. The ground port GND of the LDO is connected to the ground terminal. The output port VO of the LDO is connected to the anode of the infrared LED IRED, the power input port Vcc of the infrared receiver chip IC, and the input terminal of the indicator LED, respectively. The LDO converts the preset voltage into a working voltage and outputs the working voltage to power the infrared LED IRED, the infrared receiver chip IC, and the indicator LED.

[0038] Furthermore, the power management module also includes a first capacitor C1, a second capacitor C2, a first diode D1, and a second diode D2; the external power supply VCC is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the ground terminal; the second terminal of the first resistor R1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is connected to the anode of the second diode D2; the output port VO of the low dropout linear regulator LDO is connected to the first terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is connected to the anode of the second diode D2.

[0039] The preset voltage is 5-24V, and the operating voltage is 5V.

[0040] Specifically, a low dropout linear regulator (LDO) is a special type of linear voltage regulator that can maintain a stable output voltage even when the input voltage is very close to the output voltage. "Low dropout" refers to the fact that the minimum difference between the input and output voltages can be very small while ensuring normal operation of the regulator. Its working principle involves adjusting the conduction level of a control element to maintain output voltage stability. When the input voltage or load current changes, the error amplifier inside the LDO detects the change in output voltage and adjusts the operating state of the control element accordingly to ensure that the output voltage remains within a set range.

[0041] In this embodiment, a low-dropout linear regulator (LDO) converts the preset voltage (5-24V) provided by the external power supply VCC into a stable operating voltage (5V), which is then supplied to the infrared LED (IRED), infrared receiver chip IC, and indicator LED. Because the LDO can operate with the input voltage close to the output voltage, it can maintain a stable output voltage over a wide input voltage range, exhibiting strong adaptability and compatibility with various power supply types. This allows a single power module to supply power to multiple loads. The first resistor R1 and the second resistor R2 form a voltage divider circuit, supplying power to the LDO. The EN port provides a reference voltage to ensure that the low dropout linear regulator (LDO) operates under a suitable input voltage. The first capacitor C1 and the second capacitor C2 are used for filtering at the input and output terminals of the LDO, respectively. The first capacitor C1 can smooth high-frequency noise in the input voltage, and the second capacitor C2 can further stabilize the 5V output voltage of the LDO, reducing output voltage fluctuations and noise. The first diode D1 and the second diode D2 form a rectifier circuit to ensure that the current can only flow in one direction, preventing reverse current from damaging the circuit. In addition, the second diode D2 can also play a protective role, preventing transient voltage from flowing back to ground.

[0042] In one embodiment, such as Figure 2 As shown, the voltage output adjustment unit includes a first transistor Tr and a third resistor R3; the base of the first transistor Tr is connected to the first output port LED OUT of the infrared receiver chip IC, the collector of the first transistor Tr is connected to the cathode of the infrared light-emitting diode IRED, the emitter of the first transistor Tr is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the ground terminal. The resistance value of the third resistor R3 is adjustable.

[0043] Specifically, the ground port GND of the infrared receiver chip IC is connected to the ground terminal, and both power input ports Vcc of the infrared receiver chip IC are connected to the output terminal of the power management module.

[0044] In this embodiment, the infrared receiver chip IC can not only receive the infrared light reflected by the detected object, but also convert it into an electrical signal through the internal photoelectric effect, and output it to the base of the first transistor Tr through the first output port LED OUT, thereby controlling the working state of the infrared light-emitting diode IRED. In addition, the infrared receiver chip IC can also provide pulse voltage to the infrared light-emitting diode IRED to ensure its normal operation. The base of the first transistor Tr in the voltage output adjustment unit receives the electrical signal emitted by the infrared receiver chip IC. Based on the high or low level of the electrical signal, the first transistor Tr is turned on or off, thereby controlling the working state of the infrared light-emitting diode IRED. The main function of the third resistor R3 is to limit the current flowing through the infrared light-emitting diode IRED to protect the infrared light-emitting diode IRED from damage due to excessive current. Meanwhile, since the resistance of the third resistor R3 is adjustable, the current flowing through the infrared LED IRED can be changed by adjusting its resistance, thereby adjusting the luminous intensity of the infrared LED IRED. Specifically, the larger the resistance of the third resistor R3, the smaller the current flowing through the infrared LED IRED, and the weaker the luminous intensity of the infrared LED IRED; conversely, the smaller the resistance of the third resistor R3, the larger the current flowing through the infrared LED IRED, and the stronger the luminous intensity of the infrared LED IRED. Correspondingly, the luminous intensity of the infrared LED IRED directly determines the signal strength and distance that the circuit can transmit. By adjusting the current flowing through the infrared LED IRED, its luminous intensity can be controlled, thereby adjusting the signal transmission characteristics.

[0045] In one embodiment, such as Figure 1 and Figure 2 As shown, the working status indication module also includes a signal output unit; the output terminal of the indicator LED is connected to the signal output unit, and the working status of the indicator LED and the signal output unit is controlled based on the level signal output by the infrared receiving chip IC.

[0046] Furthermore, when an object is present within the preset detection range of the infrared receiver chip IC, the infrared receiver chip IC receives the infrared light emitted by the infrared light-emitting diode (IRED) reflected by the object and outputs a high-level signal, the indicator LED lights up, and the signal output unit outputs a low-level signal; when no object is present within the preset detection range of the infrared receiver chip IC, the infrared receiver chip IC outputs a low-level signal, the indicator LED turns off, and the signal output unit outputs a high-level signal.

[0047] Furthermore, the signal output unit includes a second transistor DTr, a third diode D3, and a signal output port Vout; the output terminal of the indicator LED is connected to the base of the second transistor DTr, the emitter of the second transistor DTr is connected to the ground terminal, and the collector of the second transistor DTr is connected to the signal output port Vout; the anode of the third diode D3 is connected to the ground terminal, and the cathode of the third diode D3 is connected to the signal output port Vout.

[0048] Furthermore, the operating status indicator module also includes a fourth resistor R4; the output of the power management module is connected to the input of the indicator LED through the fourth resistor R4.

[0049] Specifically, the working status indication module mainly controls the on / off state of the indicator LED based on the output level signal of the infrared receiver chip IC, and outputs the corresponding level signal through the signal output unit. The indicator LED indicates the working status of the photoelectric sensor. When an object is detected, the indicator LED lights up, indicating that the photoelectric sensor is in working state; when no object is detected, the indicator LED is off, indicating that the photoelectric sensor is in standby or non-working state. The fourth resistor R4 limits the current flowing through the indicator LED to protect it from burnout. The second transistor DTr acts as a switch, controlling the level state of the signal output port Vout. That is, when the indicator LED is on, the second transistor DTr is turned on, controlling the signal output port Vout to output a low-level signal; when the indicator LED is off, the second transistor DTr is turned off, controlling the signal output port Vout to output a high-level signal. The third diode, D3, is used to prevent reverse current from damaging the circuit. Specifically, when the signal output port Vout is low, the third diode D3 prevents current from flowing from ground to the signal output port Vout, protecting the circuit from reverse current. In summary, the working principle of the signal output unit is as follows: When an object is detected, the infrared receiver chip IC outputs a high-level signal to light up the indicator LED. Simultaneously, the high-level signal turns on the second transistor DTr, reducing the resistance between its collector and emitter, causing the signal output port Vout to nearly short-circuit with the ground terminal, thus outputting a low-level signal. When no object is detected, the infrared receiver chip IC outputs a low-level signal to turn off the indicator LED. Simultaneously, the low-level signal turns off the second transistor DTr, creating an open circuit between its collector and emitter. The signal output port Vout is connected to the power supply through the third diode D3, thus outputting a high-level signal.

[0050] In this embodiment, the indicator LED can intuitively display the working status of the circuit, making it easy for users to know whether an object has been detected. Through the cooperation of the second transistor DTr and the third diode D3, the signal output unit can stably output high-level or low-level signals, providing reliable control signals for subsequent circuits. The fourth resistor R4 and the third diode D3 respectively protect the indicator LED and the signal output port Vout, improving the reliability and stability of the entire circuit.

[0051] In another embodiment, a reflective photoelectric sensor is provided, including a PLC and a reflective photoelectric sensor circuit as described in any of the above embodiments; the PLC and the reflective photoelectric sensor circuit are controlled to be connected.

[0052] In this embodiment, the PLC is connected to the reflective photoelectric sensor circuit for control, so that the PLC can send control signals to the photoelectric sensor circuit, and the photoelectric sensor circuit can also feed back the detection results to the PLC. This two-way communication enables the entire system to have automatic detection and control capabilities, and is suitable for various automation scenarios, such as production line detection, security protection, access control, material arrival detection, etc.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A reflective opto-electronic sensor circuit, characterized by It includes a power management module, an infrared sensing module, and a working status indicator module; The power management module is used to convert the preset voltage into the working voltage and output the working voltage to the infrared sensing module and the working status indicator module respectively for power supply; The infrared sensing module includes an infrared light-emitting diode, an infrared receiving chip, and a voltage output regulation unit. The output terminal of the power management module is connected to the anode of the infrared light-emitting diode and the power input port of the infrared receiving chip, respectively. The first output port of the infrared receiving chip is connected to the cathode of the infrared light-emitting diode through the voltage output regulation unit. The infrared receiving chip provides a pulse voltage to the infrared light-emitting diode and adjusts the light intensity of the infrared light-emitting diode through the voltage output regulation unit. The working status indication module includes an indicator light, the input terminal of which is connected to the output terminal of the power management module and the second output port of the infrared receiving chip, respectively.

2. The reflective optoelectronic sensor circuit of claim 1, wherein, The power management module includes a low-dropout linear regulator, a first resistor, and a second resistor; An external power supply is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the power port of the low dropout linear regulator to provide a preset voltage to the low dropout linear regulator. The second end of the first resistor is also connected to the enable port of the low dropout linear regulator. The grounding port of the low-dropout linear regulator is connected to the grounding terminal; The output port of the low-dropout linear regulator is connected to the anode of the infrared LED, the power input port of the infrared receiver chip, and the input terminal of the indicator light, respectively. The low-dropout linear regulator is used to convert the preset voltage into the working voltage and output the working voltage to the infrared LED, the infrared receiver chip, and the indicator light to power them.

3. The reflective optoelectronic sensor circuit of claim 2, wherein, The power management module also includes a first capacitor, a second capacitor, a first diode, and a second diode; An external power supply is connected to the cathode of the first diode, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to the ground terminal. The second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the anode of the second diode. The output port of the low-dropout linear regulator is connected to the first terminal of the second capacitor, and the second terminal of the second capacitor is connected to the anode of the second diode.

4. The reflective optoelectronic sensor circuit of claim 2, wherein, The preset voltage is 5-24V, and the operating voltage is 5V.

5. The reflective optoelectronic sensor circuit of claim 1, wherein, The voltage output regulation unit includes a first transistor and a third resistor; The base of the first transistor is connected to the first output port of the infrared receiver chip, the collector of the first transistor is connected to the cathode of the infrared light-emitting diode, the emitter of the first transistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the ground terminal. The resistance value of the third resistor is adjustable.

6. The reflective photoelectric sensor circuit according to claim 1, characterized in that, The working status indication module also includes a signal output unit; The output terminal of the indicator light is connected to the signal output unit, and the working state of the indicator light and the signal output unit is controlled based on the level signal output by the infrared receiving chip.

7. The reflective photoelectric sensor circuit according to claim 6, characterized in that, When an object is present within the preset detection range of the infrared receiving chip, the infrared receiving chip receives the infrared light emitted by the infrared light-emitting diode reflected by the object and outputs a high-level signal, the indicator light illuminates, and the signal output unit outputs a low-level signal. When there is no object to be detected within the preset detection range of the infrared receiving chip, the infrared receiving chip outputs a low-level signal, the indicator light turns off, and the signal output unit outputs a high-level signal.

8. The reflective optoelectronic sensor circuit of claim 6, wherein, The signal output unit includes a second transistor, a third diode, and a signal output port; The output terminal of the indicator light is connected to the base of the second transistor, the emitter of the second transistor is connected to the ground terminal, and the collector of the second transistor is connected to the signal output port. The anode of the third diode is connected to the ground terminal, and the cathode of the third diode is connected to the signal output port.

9. The reflective optoelectronic sensor circuit of claim 6, wherein, The operating status indication module also includes a fourth resistor; The output of the power management module is connected to the input of the indicator light via the fourth resistor.

10. A reflective optoelectronic sensor, characterized in that Includes a PLC and a reflective photoelectric sensor circuit as described in any one of claims 1 to 9; The PLC and the reflective photoelectric sensor circuit are connected in a control manner.

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