Ultrasonic radar circuit for tunnel traffic jam detection

Abstract

The utility model relates to the technical field of vehicle detection circuits, and discloses an ultrasonic radar circuit for tunnel traffic jam detection. Comprising a power supply circuit for reducing the voltage of a 48V power supply to 24V, a power supply circuit for reducing the voltage of the 48V power supply to 5V, a TTL (Transistor-Transistor Logic) signal receiving and transmitting circuit for receiving ultrasonic radar data, a singlechip circuit for data analysis and vehicle detection signal output, and a driving circuit for signal conversion, the power supply circuit, the TTL signal transmit-receive circuit, the single-chip microcomputer circuit and the drive circuit are connected in sequence. According to the application, vehicle driving data of real-time road conditions are obtained through the TTL signal receiving and transmitting circuit, and the data are transmitted to the single-chip microcomputer circuit; the single-chip microcomputer circuit analyzes the data and outputs TTL signals according to the data content; and the driving circuit converts the TTL signal into a 485 signal.

Description

Technical Field

[0001] This application relates to the technical field of vehicle detection circuits, and specifically to an ultrasonic radar circuit for tunnel traffic jam detection. Background Art

[0002] An ultrasonic radar is a radar system that uses ultrasonic technology for ranging and detecting targets. It emits ultrasonic pulses and determines the distance and relevant information of the target based on the interaction of the waves with the object. Ultrasonic radars are widely used in fields such as measurement, safety, navigation, detection, and positioning. For example, in industrial measurement and manufacturing, ultrasonic radars can measure the thickness and quality of materials. In the medical field, ultrasonic radars can be used for ultrasonic diagnosis, medical imaging, and surgical navigation applications. In autonomous driving and intelligent transportation systems, ultrasonic radars can be used for functions such as obstacle detection, road recognition, and automatic braking. Due to the characteristics of ultrasonic technology, it is particularly prominent in obstacle detection, making ultrasonic radars more widely used in obstacle detection. Summary of the Utility Model

[0003] The purpose of this application is to provide an ultrasonic radar circuit for tunnel traffic jam detection to reflect the wide application of the above background technology.

[0004] To achieve the above purpose, an ultrasonic radar circuit for tunnel traffic jam detection includes a power supply circuit that steps down the 48V power supply to 24V, a power supply circuit that steps down the 48V power supply to 5V, a TTL signal transceiver circuit for receiving ultrasonic radar data, a single-chip microcomputer circuit for data parsing and outputting vehicle detection signals, and a driving circuit for signal conversion; the power supply circuit, the TTL signal transceiver circuit, the single-chip microcomputer circuit, and the driving circuit are connected in sequence.

[0005] Preferably, the power supply circuit that steps down the 48V power supply to 24V includes a capacitor C1, a power supply chip U1, and a capacitor C2; the positive terminal of the capacitor C1 is connected to the +V0 pin of the power supply chip U1 and the power consumption terminal VDD24V, the negative terminal of the capacitor C1 is connected to the 0V pin of the power supply chip U1 and the power consumption terminal PGND, the positive terminal of the capacitor C2 is connected to the Vin pin of the power supply chip U1 and the 48V power supply terminal VIN, and the negative terminal of the capacitor C2 is connected to the GND pin of the power supply chip U1 and the 48V power supply terminal GND.

[0006] Preferably, the power supply circuit for stepping down the 48V power supply to 5V includes a capacitor C4, a power supply chip U3, and a capacitor C5; the positive terminal of the capacitor C4 is connected to the Vin pin of the power supply chip U3 and the 48V power supply terminal VIN, the negative terminal of the capacitor C4 is connected to the GND pin of the power supply chip U3 and the 48V power supply terminal GND, the positive terminal of the capacitor C5 is connected to the +V0 pin of the power supply chip U3 and the power consumption terminal VDD5V, and the negative terminal of the capacitor C5 is connected to the 0V pin of the power supply chip U3 and the power consumption terminal PGND.

[0007] Preferably, the TTL signal transceiver circuit includes a receiving end CN3 and a transmitting end CN4; the receiving end CN3 is connected to the ultrasonic radar, and the transmitting end CN4 is connected to the ultrasonic radar.

[0008] Preferably, the single-chip microcomputer circuit includes a single-chip microcomputer U2, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a resistor R5, a resistor R6, a diode D3, a triode Q1, and a buzzer BUZZER1. The 1 pin of the single-chip microcomputer U2 is respectively connected to the 1 pin of the capacitor C5, the 1 pin of the capacitor C6, and the 1 pin of the diode D3. The 2 pin of the capacitor C5 is connected to the 2 pin of the capacitor C6 and the 2 pin of the diode D3 and grounded; the 40 pin of the single-chip microcomputer U2 is respectively connected to the 1 pin of the capacitor C8 and the 1 pin of the capacitor C9. The 2 pin of the capacitor C8 is connected to the 2 pin of the capacitor C9 and grounded; the 59 pin of the single-chip microcomputer U2 is connected to the 1 pin of the resistor R5. The 2 pin of the resistor R5 is respectively connected to the 1 pin of the resistor R6 and the 1 pin of the triode Q1. The 2 pin of the resistor R6 is connected to the 2 pin of the triode Q1 and grounded. The 3 pin of the triode Q1 is connected to the negative terminal pin of the buzzer BUZZER1, and the positive terminal pin of the buzzer BUZZER1 is connected to the 5V power supply terminal.

[0009] Preferably, the drive circuit includes a drive chip U4, a diode D4, a capacitor C7, resistors R2, R3, R4, and an output terminal CN1. The 1 pin of the drive chip U4 is respectively connected to the 1 pin of the diode D4 and the 1 pin of the capacitor C7. The 2 pin of the drive chip U4 is respectively connected to the 2 pin of the diode D4 and the 2 pin of the capacitor C7 and grounded. The 3 pin of the drive chip U4 is connected to the 1 pin of the resistor R3. The 2 pin of the resistor R3 is connected to the 5 pin of the output terminal CN1. The 4 pin of the drive chip U4 is connected to the 1 pin of the resistor R4. The 2 pin of the resistor R4 is connected to the 2 pin of the output terminal CN1. The 8 pin of the drive chip U4 is connected to the 2 pin of the resistor R2. The 9 pin of the drive chip U4 is connected to the 1 pin of the resistor R2.

[0010] Preferably, pins 4 and 5 of the receiving end CN3 of the TTL signal transceiver circuit are connected to pins 10 and 11 of the single-chip microcomputer, and pins 2 and 3 of the transmitting end CN4 of the TTL signal transceiver circuit are connected to pins 10 and 11 of the single-chip microcomputer.

[0011] Preferably, pin 3 of the driving chip U4 is connected to pin 1 of the resistor R3 and at the same time connected to pin 69 of the single-chip microcomputer U2, pin 4 of the driving chip U4 is connected to pin 1 of the resistor R4 and at the same time connected to pin 70 of the single-chip microcomputer U2, and pin 5 of the driving chip U4 is connected to pin 64 of the single-chip microcomputer U2.

[0012] Beneficial effects: The ultrasonic radar circuit for tunnel traffic jam detection in this application receives the real-time lane data sent by the ultrasonic radar through the TTL signal transceiver circuit. The single-chip microcomputer circuit receives and processes the data from the TTL signal transceiver circuit, calculates the time difference between the transmitted wave and the reflected wave of this lane within a unit time, compares it with the actual distance to the ground to determine whether there is a traffic jam, and then converts the signal through the driving circuit and sends it to the upper computer. The upper computer immediately issues an alarm when receiving the data, and the duty personnel can immediately take effective measures to timely avoid the safety hazards brought by tunnel traffic jams. Compared with the prior art, the ultrasonic radar circuit for tunnel traffic jam detection in this application simplifies the construction plan; in terms of cost, no other equipment needs to be installed to realize real-time remote monitoring by personnel whether there is a traffic jam in the tunnel, so as to make corresponding measures in time. In terms of use, in addition to being able to be used alone, it can also be flexibly matched with other types of radars, and the detection data does not interfere with each other. For later maintenance, the ultrasonic radar circuit will not affect the operation of other circuits and has strong anti-interference ability; when the ultrasonic radar circuit fails, what you see is what you get, and there is no need to check other circuits. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is the power supply circuit diagram provided by the embodiment of the present application;

[0015] Figure 2 It is the TTL signal transceiver circuit diagram provided by the embodiment of the present application;

[0016] Figure 3 It is the single-chip microcomputer circuit diagram provided by the embodiment of the present application;

[0017] Figure 4 The drive circuit diagram provided by the embodiment of the present application;

[0018] Figure 5 The circuit schematic diagram of an ultrasonic radar circuit for tunnel traffic jam detection provided by the embodiment of the present application. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0020] In this article, the term "including" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without further limitations, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0021] This embodiment discloses an ultrasonic radar circuit for tunnel traffic jam detection as shown in Figure 5 , including a power supply circuit for stepping down the 48V power supply to 24V, a power supply circuit for stepping down the 48V power supply to 5V, a TTL signal transceiver circuit for receiving ultrasonic radar data, a single-chip microcomputer circuit for data parsing and vehicle detection signal output, and a drive circuit for signal conversion; the power supply circuit, the TTL signal transceiver circuit, the single-chip microcomputer circuit and the drive circuit are connected in sequence.

[0022] In this embodiment, the power supply circuit for stepping down the 48V power supply to 24V includes a capacitor C2, a power supply chip U1, and a capacitor C3.

[0023] Specifically, the positive terminal of the capacitor C3 is connected to the Vin pin of the power supply chip U1 and the 48V power supply terminal VIN as the power input terminal. The capacitor C3 is a decoupling and filtering capacitor for the power supply, preventing the 48V power supply from being interfered and providing power for the power supply chip U1 at the same time; the negative terminal of the capacitor C3 is connected to the GND pin of the power supply chip U1 and the 48V power supply terminal GND; the +V0 pin of the power supply chip U1 is connected to the positive terminal of the capacitor C2 and the 24V power supply output terminal at the same time; the 0V pin of the power supply chip U1 and the negative terminal of the capacitor C2 are both connected to GND, and the capacitor C2 is a filtering capacitor.

[0024] In this embodiment, the power supply circuit for stepping down the 48V power supply to 5V includes a capacitor C1, a power supply chip U3, and a capacitor C4.

[0025] Specifically, the positive terminal of the capacitor C4 is connected to the Vin pin of the power supply chip U3 and the 48V power supply terminal VIN, serving as the power input terminal. The capacitor C4 is a decoupling and filtering capacitor for the power supply, preventing the 48V power supply from being interfered and providing power for the power supply chip U3 at the same time. The negative terminal of the capacitor C4 is connected to the GND pin of the power supply chip U3 and the 48V power supply terminal GND; the +V0 pin of the power supply chip U3 is connected to the positive terminal of the capacitor C1 and the 5V power output terminal at the same time; the 0V pin of the power supply chip U3 and the negative terminal of the capacitor C1 are both connected to GND, and the capacitor C1 is a filtering capacitor.

[0026] In this embodiment, the TTL signal transceiver circuit includes a receiving end CN3 and a transmitting end CN4.

[0027] Specifically, the pin 4 of the receiving end CN3 and the pin 2 of the transmitting end CN4 are connected to the pin 10 of the single-chip microcomputer; the pin 5 of the receiving end CN3 and the pin 3 of the transmitting end CN4 are connected to the pin 11 of the single-chip microcomputer.

[0028] In this embodiment, the single-chip microcomputer circuit includes a single-chip microcomputer U2, capacitors C5, C6, C8, C9, resistors R5, R6, a diode D3, a triode Q1, and a buzzer BUZZER1.

[0029] Specifically, the pin 1 of the single-chip microcomputer U2 is respectively connected to the pin 1 of the capacitor C5, the pin 1 of the capacitor C6, and the pin 1 of the diode D3; the pin 2 of the capacitor C5, the pin 2 of the capacitor C6, and the pin 2 of the diode D3 are connected and grounded; the capacitor C5 is a filtering capacitor, which can filter out high-frequency noise and fluctuations in the circuit, effectively improving the accuracy and stability of the circuit; C6 is a voltage stabilizing capacitor, which maintains a stable power supply voltage for the single-chip microcomputer by releasing the energy stored in the capacitor; D3 is a Schottky diode, which conducts forward and cuts off backward, and is used to protect the circuit and effectively prevent reverse power connection.

[0030] Specifically, the pin 40 of the single-chip microcomputer U2 is respectively connected to the pin 1 of the capacitor C8 and the pin 1 of the capacitor C9; the pin 2 of the capacitor C8 and the pin 2 of the capacitor C9 are connected and grounded; the capacitor C5 is a filtering capacitor, which can filter out high-frequency noise and fluctuations in the circuit, effectively improving the accuracy and stability of the circuit; C6 is a voltage stabilizing capacitor, which maintains a stable power supply voltage for the single-chip microcomputer by releasing the energy stored in the capacitor.

[0031] Specifically, the 59th pin of the single-chip microcomputer U2 is connected to the 1st pin of the resistor R5. The 2nd pin of the resistor R5 is respectively connected to the 1st pin of the triode Q1 and the 1st pin of the resistor R6. The 2nd pin of the resistor R6 is connected to the 2nd pin of the triode Q1 and grounded. The 3rd pin of the triode Q1 is connected to the negative terminal of the buzzer BUZZER1. The positive terminal of the buzzer BUZZER1 is connected to the 5V power supply output terminal. The positive pole of the buzzer BUZZER1 is powered from the VCC (+5V) power supply. The negative pole of the buzzer is connected to the collector C of the triode Q1. The base B of the triode Q1 is controlled by the 59th pin of the single-chip microcomputer after passing through the current-limiting resistor R5. When the 59th pin of the single-chip microcomputer outputs a high level, the triode Q1 is cut off, no current flows through the coil, and the buzzer does not sound. When the 59th pin of the single-chip microcomputer outputs a low level, the triode conducts, so that the current of the buzzer forms a loop and makes a sound. The resistor R6 is the base resistor of the triode Q1, which limits the base current. The triode Q1 acts as a switching tube to control the buzzer.

[0032] In this embodiment, the drive circuit includes a drive chip U4, a diode D4, a capacitor C7, resistors R2, R3, R4, and an output terminal CN1.

[0033] Specifically, the 1st pin of the drive chip U4 is respectively connected to the 1st pin of the diode D4 and the 1st pin of the capacitor C7. The 2nd pin of the drive chip U4 is respectively connected to the 2nd pin of the diode D4 and the 2nd pin of the capacitor C7 and grounded. The 3rd pin of the drive chip U4 is respectively connected to the 69th pin of the single-chip microcomputer U2 and the 1st pin of the resistor R3. The 2nd pin of the resistor R3 is connected to the 5th pin of the output terminal CN1. The 4th pin of the drive chip U4 is respectively connected to the 70th pin of the single-chip microcomputer U2 and the 1st pin of the resistor R4. The 2nd pin of the resistor R4 is connected to the 2nd pin of the output terminal CN1. The 8th and 9th pins of the drive chip U4 are respectively connected to the 1st and 2nd pins of the resistor R2. The drive chip U4 and the single-chip microcomputer U2 are both powered by 3.3V. A diode D4 is added at the power supply terminal of the drive chip U4 for isolation to reduce the influence of the subsequent stage power supply on the previous stage. The diode can also block reverse current and prevent current backflow from damaging the drive chip U4 when the power is turned off. C7 is a voltage stabilizing capacitor, which maintains a stable power supply voltage for the drive chip U4 by releasing the energy stored in the capacitor. The 8th and 9th pins of the drive chip U4 are connected in parallel with the matching resistor R2. RS-485 is differential level communication. When the distance is long or the rate is high, there is echo interference in the line. Therefore, 120Ω resistors are connected in parallel at both ends of the communication line for impedance matching to eliminate signal reflection generated on the line due to mismatch. The data of the single-chip microcomputer U2 is transmitted to the transceiver terminals 3, 4, and 5 of the drive chip U4 via the 69th, 70th, and 64th pins. The drive chip U4 converts the data and transmits it to the 5th and 2nd pins of the output terminal CN1 via the transceiver terminals 3 and 4.

[0034] Finally, it should be noted that the above are only preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An ultrasonic radar circuit for tunnel traffic jam detection, characterized in that, It includes a power supply circuit for stepping down the 48V power supply to 24V, a power supply circuit for stepping down the 48V power supply to 5V, a TTL signal transceiver circuit for ultrasonic radar data reception, a single-chip microcomputer circuit for data parsing and vehicle detection signal output, and a driving circuit for signal conversion; The power supply circuit, the TTL signal transceiver circuit, the single-chip microcomputer circuit and the driving circuit are connected in sequence.

2. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 1, characterized in that The power supply circuit for stepping down the 48V power supply to 24V includes a capacitor C2, a power supply chip U1, and a capacitor C3; the positive terminal of the capacitor C2 is connected to the +V0 pin of the power supply chip U1 and the power consumption terminal VDD24V, the negative terminal of the capacitor C2 is connected to the 0V pin of the power supply chip U1 and the power consumption terminal PGND, the positive terminal of the capacitor C3 is connected to the Vin pin of the power supply chip U1 and the 48V power supply terminal VIN, and the negative terminal of the capacitor C3 is connected to the GND pin of the power supply chip U1 and the 48V power supply terminal GND.

3. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 1, characterized in that, The power supply circuit for stepping down the 48V power supply to 5V includes a capacitor C1, a power supply chip U3, and a capacitor C4; the positive terminal of the capacitor C4 is connected to the Vin pin of the power supply chip U3 and the 48V power supply terminal VIN, the negative terminal of the capacitor C4 is connected to the GND pin of the power supply chip U3 and the 48V power supply terminal GND, the positive terminal of the capacitor C1 is connected to the +V0 pin of the power supply chip U3 and the power consumption terminal VDD5V, and the negative terminal of the capacitor C1 is connected to the 0V pin of the power supply chip U3 and the power consumption terminal PGND.

4. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 1, characterized in that, The TTL signal transceiver circuit includes a receiving end CN3 and a transmitting end CN4; the receiving end CN3 is connected to the ultrasonic radar, and the transmitting end CN4 is connected to the ultrasonic radar.

5. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 1, wherein The single-chip microcomputer circuit includes a single-chip microcomputer U2, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a resistor R5, a resistor R6, a diode D3, a triode Q1, and a buzzer BUZZER1. The 1 pin of the single-chip microcomputer U2 is respectively connected to the 1 pin of the capacitor C5, the 1 pin of the capacitor C6, and the 1 pin of the diode D3. The 2 pins of the capacitor C5, the capacitor C6, and the diode D3 are connected and grounded; the 40 pin of the single-chip microcomputer U2 is respectively connected to the 1 pin of the capacitor C8 and the 1 pin of the capacitor C9. The 2 pins of the capacitor C8 and the capacitor C9 are connected and grounded; the 59 pin of the single-chip microcomputer U2 is connected to the 1 pin of the resistor R5. The 2 pin of the resistor R5 is respectively connected to the 1 pin of the resistor R6 and the 1 pin of the triode Q1. The 2 pin of the resistor R6 is connected to the 2 pin of the triode Q1 and grounded. The 3 pin of the triode Q1 is connected to the negative terminal pin of the buzzer BUZZER1, and the positive terminal pin of the buzzer BUZZER1 is connected to the 5V power supply.

6. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 1, characterized in that, The driving circuit includes a driving chip U4, a diode D4, a capacitor C7, a resistor R2, a resistor R3, a resistor R4, and an output terminal CN1. The pin 1 of the driving chip U4 is respectively connected to the pin 1 of the diode D4 and the pin 1 of the capacitor C7. The pin 2 of the driving chip U4 is respectively connected to the pin 2 of the diode D4 and the pin 2 of the capacitor C7 and grounded. The pin 3 of the driving chip U4 is connected to the pin 1 of the resistor R3. The pin 2 of the resistor R3 is connected to the pin 5 of the output terminal CN1. The pin 4 of the driving chip U4 is connected to the pin 1 of the resistor R4. The pin 2 of the resistor R4 is connected to the pin 2 of the output terminal CN1. The pin 8 of the driving chip U4 is connected to the pin 2 of the resistor R2. The pin 9 of the driving chip U4 is connected to the pin 1 of the resistor R2.

7. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 4, characterized in that The pins 4 and 5 of the receiving terminal CN3 of the TTL signal transceiver circuit are connected to the pins 10 and 11 of the single-chip microcomputer. The pins 2 and 3 of the sending terminal CN4 of the TTL signal transceiver circuit are connected to the pins 10 and 11 of the single-chip microcomputer.

8. The ultrasonic radar circuit for tunnel traffic jam detection according to claim 6, characterized in that The pin 3 of the driving chip U4 is connected to the pin 1 of the resistor R3 and at the same time connected to the pin 69 of the single-chip microcomputer U2. The pin 4 of the driving chip U4 is connected to the pin 1 of the resistor R4 and at the same time connected to the pin 70 of the single-chip microcomputer U2. The pin 5 of the driving chip U4 is connected to the pin 64 of the single-chip microcomputer U2.

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