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CN-224216880-U - Distance and existence detection circuit based on infrared transmitting tube and receiving tube

CN224216880UCN 224216880 UCN224216880 UCN 224216880UCN-224216880-U

Abstract

The utility model discloses a distance and existence detection circuit based on an infrared transmitting tube and a receiving tube, which is characterized by comprising a power supply circuit, a voltage stabilizing circuit, a signal amplification filtering sampling circuit and an MCU processor, wherein the power supply circuit is connected with one end of the voltage stabilizing circuit, the other end of the voltage stabilizing circuit is connected with one end of the signal amplification filtering sampling circuit, and the other end of the signal amplification filtering sampling circuit is connected with the MCU processor. According to the utility model, the infrared transmitting tube and the infrared receiving tube are arranged side by side, the infrared transmitting tube is driven by the circuit to transmit light, when an object is shielded, the infrared receiving tube amplifies a signal by connecting with the operational amplifier circuit, filters the signal by the filter circuit, and then acquires the signal by the ADC to detect the signal intensity, so that the distance measurement and the object existence sensing are realized. The distance detection and the existence detection are realized by a hardware circuit only by a transmitting tube and a receiving tube without a drive IC, and the cost is lower.

Inventors

  • HUANG YU

Assignees

  • 昆山金运新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20250428

Claims (10)

  1. 1. The distance and existence detection circuit based on the infrared emission tube and the receiving tube is characterized by comprising a power supply circuit, a voltage stabilizing circuit, a signal amplification filtering sampling circuit and an MCU processor, wherein the power supply circuit is connected with one end of the voltage stabilizing circuit, the other end of the voltage stabilizing circuit is connected with one end of the signal amplification filtering sampling circuit, and the other end of the signal amplification filtering sampling circuit is connected with the MCU processor.
  2. 2. The infrared transmitting tube and receiving tube based distance and existence detecting circuit according to claim 1, characterized in that the power supply circuit comprises a chip U7, a pin 1 of the chip U7 is grounded, a pin 3 of the chip U7 is respectively connected with one end of a resistor R30, one end of a capacitor C28, one end of a capacitor C27, an anode of a polarity capacitor C29, one end of a bidirectional TVS diode D3 and a cathode of a diode D2, the anode of the diode D2 is connected with the anode of the power supply, the other end of the bidirectional TVS diode D3 is grounded, the cathode of the polarity capacitor C29 is grounded, the other end of the capacitor C30 is respectively connected with the other end of the capacitor C28 and the other end of the capacitor C27 and grounded, a pin 5 of the chip U7 is respectively connected with the other end of the resistor R30 and one end of the resistor R31, the other end of the resistor R31 is grounded, a pin 6 of the chip U7 is connected with one end of the capacitor C32, the other end of the capacitor C32 is respectively connected with the pin 2 of the chip U7 and one end of the coil L2, the other end of the coil L2 is respectively connected with one end of the capacitor C37, one end of the resistor R37, one end of the resistor C41, one end of the capacitor C42, one end of the resistor C43 and one end of the resistor R47, the other end of the resistor R47 is connected with the anode of the light-emitting diode D5, the cathode of the light-emitting diode D5 is grounded, the other end of the capacitor C37 is connected with the other end of the capacitor C39 and grounded, the other end of the capacitor C42 is connected with the other end of the capacitor C43 and grounded, the pin 4 of the chip U7 is respectively connected with one end of the capacitor C40, one end of the resistor R38, one end of the resistor R39 and one end of the resistor R44, the other end of the resistor R39 is grounded, the other end of the capacitor C40 is respectively connected with the other end of the resistor R38 and the other end of the resistor R37, and the other end of the resistor R44 is connected with the other end of the resistor C41.
  3. 3. The infrared transmitting and receiving tube-based distance and presence detection circuit according to claim 2, wherein said chip U7 is of model 54302.
  4. 4. The infrared transmitting and receiving tube-based distance and presence detection circuit according to claim 2, wherein said power supply circuit is a 12V to 5V power supply circuit.
  5. 5. The infrared transmitting tube and receiving tube based distance and presence detecting circuit according to claim 2, wherein the voltage stabilizing circuit comprises a chip U3, a pin 1 of the chip U3 is respectively connected with one end of a capacitor C15, one end of a capacitor C16 and one end of a capacitor C43, the other end of the capacitor C15 is grounded, the other end of the capacitor C16 is grounded, a pin 3 of the chip U3 is grounded, a pin 5 of the chip U3 is respectively connected with one end of a capacitor C21 and one end of a capacitor C22, the other end of the capacitor C21 is grounded, and the other end of the capacitor C22 is grounded.
  6. 6. The infrared transmitting and receiving tube based distance and presence detection circuit according to claim 5, wherein said chip U3 is of the SCT74331Q type.
  7. 7. The infrared transmitting and receiving tube based distance and presence detection circuit according to claim 5, wherein said voltage stabilizing circuit is a 3.3V voltage stabilizing circuit.
  8. 8. The infrared transmitting tube and receiving tube based distance and presence detection circuit according to claim 5, wherein the signal amplifying, filtering and sampling circuit comprises an amplifier U1A, wherein a positive input end of the amplifier U1A is respectively connected with one end of a capacitor C7, one end of a resistor R1 and an E pole of a phototransistor Q1, the other end of the capacitor C7 is grounded, the other end of the resistor R1 is grounded, a C pole of the phototransistor Q1 is respectively connected with an anode of a light emitting diode D1 and a pin 5 of a chip U3, a cathode of the light emitting diode D1 is connected with one end of the resistor R3, the other end of the resistor R3 is grounded, a positive power end of the amplifier U1A is connected with a pin 1 of the chip U3, a negative power end of the amplifier U1A is grounded, an inverting input end of the amplifier U1A is respectively connected with an output end of the amplifier U1A and one end of a resistor R4, the other end of the resistor R4 is connected with one end of a capacitor C8, and the other end of the capacitor C8 is grounded.
  9. 9. The infrared transmitting tube and receiving tube based distance and presence detecting circuit according to claim 8, wherein the MCU processor comprises a chip U2, a pin 5 of the chip U2 is connected to one end of a resistor R6 and one end of a capacitor C5, the other end of the resistor R6 is connected to the C pole of a phototransistor Q1, the other end of the capacitor C5 is grounded, a pin 10 of the chip U2 is connected to one end of a resistor R7, the other end of the resistor R7 is grounded, a pin 11 of the chip U2 is connected to one end of a capacitor C6, one end of a capacitor C4 and one end of a magnetic bead FB1, the other end of the magnetic bead FB1 is connected to one end of a capacitor C3, one end of a capacitor C2 and the other end of a resistor R6, one end of a capacitor C3 is connected to the other end of a capacitor C2, the other end of a capacitor C1 and one end of a resistor R2 are grounded, the other end of a capacitor C6 is connected to the other end of a capacitor C4 and the other end of a resistor R2 are grounded, the pin 13 of the chip U2 is grounded, the pin 14 of the chip U2 is connected with the other end of the resistor R6, the pin 15 of the chip U2 is connected with the other end of the resistor R4, the pin 16 of the chip U2 is connected with one end of the capacitor C13, the other end of the capacitor C13 is grounded, the pin 25 of the chip U2 is respectively connected with one end of the capacitor C17 and one end of the capacitor C18, the other end of the capacitor C17 is grounded, the other end of the capacitor C18 is grounded, the pin 27 of the chip U2 is connected with one end of the resistor R20, the pin 28 of the chip U2 is connected with one end of the resistor R19, the pin 39 of the chip U2 is connected with one end of the resistor R28, the other end of the resistor R28 is connected with the pin 4 of the terminal P4, the pin 40 of the chip U2 is connected with one end of the resistor R29, the other end of the resistor R29 is connected with the pin 5 of the terminal P4, the pin 41 of the chip U2 is connected with the pin 3 of the terminal P4, the pin 42 of the chip U2 is respectively connected with the pin 2 of the terminal P18, the other end of the resistor R18 is connected with the other end of the resistor R6, pin 1 of terminal P4 is connected to the other end of resistor R6, pin 6 of terminal P4 is grounded, pin 7 of terminal P4 is connected to pin 8 of terminal P4 and to ground, pin 43 of chip U2 is connected to one end of resistor R17, and pin 45 of chip U2 is connected to one end of resistor R16.
  10. 10. The infrared transmitting and receiving tube based distance and presence detection circuit according to claim 9, wherein said chip U2 is model KF32a141IQS.

Description

Distance and existence detection circuit based on infrared transmitting tube and receiving tube Technical Field The utility model relates to the technical field of infrared detection, in particular to a circuit for realizing distance and existence detection based on an infrared transmitting tube and a receiving tube. Background The basic principle of infrared detection is that an infrared transmitting tube emits invisible infrared light, and the infrared light is received by an infrared receiving tube after being reflected by a detection surface, so that an object or distance is detected. In general, an infrared detection device has a pair of infrared signal emitting tubes that emit infrared signals and receiving tubes that receive the infrared signals, and when the infrared signals encounter an obstacle in a detection direction, the infrared signals are reflected back to be received by the receiving tubes. The closer the obstacle is, the greater the intensity of the reflected infrared signal received by the receiving tube. The receiving end receives the infrared signal and then outputs a certain voltage, and the larger the intensity of the infrared signal is, the higher the output voltage is. In the prior art, the infrared emission tube is generally driven by the driving IC to emit light, so that the cost is high when the infrared detection device is designed. Disclosure of utility model In view of the above, in order to solve the above problems in the prior art, the present utility model provides a distance and presence detection circuit based on an infrared emission tube and a receiving tube, which does not need a driving IC, and drives the infrared emission tube to emit light through the circuit, so that the cost is lower. The utility model solves the problems by the following technical means: The distance and existence detection circuit based on the infrared emission tube and the receiving tube comprises a power supply circuit, a voltage stabilizing circuit, a signal amplification filtering sampling circuit and an MCU processor, wherein the power supply circuit is connected with one end of the voltage stabilizing circuit, the other end of the voltage stabilizing circuit is connected with one end of the signal amplification filtering sampling circuit, and the other end of the signal amplification filtering sampling circuit is connected with the MCU processor. Preferably, the power supply circuit includes a chip U7, a pin 1 of the chip U7 is grounded, a pin 3 of the chip U7 is respectively connected to one end of a resistor R30, one end of a capacitor C28, one end of a capacitor C27, an anode of a polarity capacitor C29, one end of a bidirectional TVS diode D3 and a cathode of a diode D2, the anode of the diode D2 is connected to the anode of the power supply, the other end of the bidirectional TVS diode D3 is grounded, the cathode of the polarity capacitor C29 is grounded, the other end of the capacitor C30 is respectively connected to the other end of the capacitor C28 and the other end of the capacitor C27 and is grounded, a pin 5 of the chip U7 is respectively connected to the other end of a resistor R30 and one end of a resistor R31, the other end of the resistor R31 is grounded, a pin 6 of the chip U7 is connected to one end of a capacitor C32, the other end of the capacitor C32 is respectively connected to the pin 2 of the chip U7 and one end of a coil L2, the other end of the coil L2 is respectively connected with one end of a capacitor C37, one end of a capacitor C39, one end of a resistor R37, one end of a capacitor C41, one end of a capacitor C42, one end of a capacitor C43 and one end of a resistor R47, the other end of the resistor R47 is connected with the anode of a light-emitting diode D5, the cathode of the light-emitting diode D5 is grounded, the other end of the capacitor C37 is connected with the other end of the capacitor C39 and grounded, the other end of the capacitor C42 is connected with the other end of the capacitor C43 and grounded, a pin 4 of a chip U7 is respectively connected with one end of the capacitor C40, one end of the resistor R38, one end of the resistor R39 and one end of the resistor R44, the other end of the resistor R39 is grounded, the other end of the capacitor C40 is respectively connected with the other end of the resistor R38 and the other end of the resistor R37, and the other end of the resistor R44 is connected with the other end of the capacitor C41. Preferably, the chip U7 is 54302. Preferably, the power supply circuit is a 12V to 5V power supply circuit. Preferably, the voltage stabilizing circuit includes a chip U3, a pin 1 of the chip U3 is connected to one end of a capacitor C15, one end of a capacitor C16 and one end of a capacitor C43, the other end of the capacitor C15 is grounded, the other end of the capacitor C16 is grounded, a pin 3 of the chip U3 is grounded, a pin 5 of the chip U3 is connected to one end of a capacitor C21 and one end of a