CN207607448U - Vehicle detection waveform shaping circuit - Google Patents
Vehicle detection waveform shaping circuit Download PDFInfo
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- CN207607448U CN207607448U CN201721543768.9U CN201721543768U CN207607448U CN 207607448 U CN207607448 U CN 207607448U CN 201721543768 U CN201721543768 U CN 201721543768U CN 207607448 U CN207607448 U CN 207607448U
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- ultrasonic wave
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- pass filter
- microcontroller
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Abstract
The utility model proposes a kind of vehicle detection waveform shaping circuits, it is installed on vehicle, including ultrasonic wave transmitting terminal, transformer, ultrasonic wave receiving terminal, a high pass filter unit, secondary high pass filter unit, signal amplification unit, middle control microcontroller and DC power supplier；Microcontroller power supply input terminal is controlled in DC power supplier connection, and ultrasonic wave transmitting terminal is connected by transformer；Ultrasonic wave transmitting terminal controls the signal output pin of microcontroller in being connected by driving circuit；Ultrasonic wave transmitting terminal is communicated with ultrasonic wave receiving terminal by ultrasonic wave, and ultrasonic wave receiving terminal, a high pass filter unit, secondary high pass filter unit, signal amplification unit are sequentially connected；The signal input part of microcontroller is controlled in the output end connection of signal amplification unit；After high-pass filtering twice, it is ensured that the ultrasonic signal that ultrasonic wave receiving terminal obtains obtains sufficient gain amplifier, while carrying out multiple gain to signal and amplifying the purpose for realizing high progress later and filtering out harmonic wave and noise.
Description
Technical field
The utility model is related to vehicle detection field of circuit technology, more particularly to a kind of vehicle detection waveform shaping circuit.
Background technology
As private car is more and more, it is auxiliary that most of car owner likes installation reverse image or radar for backing car etc. on private car
Reversing tool is helped, since astern radar device sends ultrasonic wave in the probe on tailstock bumper, barrier is encountered, generates echo
Signal, sensor receives and carries out data processing through controller after echo-signal, as long as and object belongs to detected range after vehicle
Within can cause radar for backing car to receive to block signal, radar for backing car will produce alarm, therefore, at good signal
Circuit is managed, signal wrong report is susceptible to, driver is influenced and carries out faulty operation.
Utility model content
The purpose of this utility model aims to solve at least one of the technological deficiency.
To achieve the goals above, the embodiment of the utility model one side provides a kind of vehicle detection waveform shaping electricity
Road is installed on vehicle, including ultrasonic wave transmitting terminal, transformer, ultrasonic wave receiving terminal, a high pass filter unit, secondary height
Pass filtering unit, signal amplification unit, middle control microcontroller and DC power supplier；Monolithic is controlled in the DC power supplier connection
Electromechanical source input terminal, and ultrasonic wave transmitting terminal is connected by transformer；During the ultrasonic wave transmitting terminal is connected by driving circuit
Control the signal output pin of microcontroller；The ultrasonic wave transmitting terminal is communicated with ultrasonic wave receiving terminal by ultrasonic wave, described
Ultrasonic wave receiving terminal, a high pass filter unit, secondary high pass filter unit, signal amplification unit are sequentially connected；The signal
The signal input part of microcontroller is controlled in the output end connection of amplifying unit.
Preferably, a high pass filter unit includes the first operational amplifier, first resistor, second resistance, third
Resistance, the 4th resistance, the first capacitance and the second capacitance；One end of the ultrasonic wave receiving terminal connection first resistor, described first
The other end of resistance connects one end of the first capacitance, and the reverse phase of the other end the first operational amplifier of connection of first capacitance is defeated
Enter end, the positive input of first operational amplifier is grounded by connecting second resistance, first operational amplifier
It connects between inverting input and output end 3rd resistor；The output end of first operational amplifier connects the one of the second capacitance
End, the other end of second capacitance connect one end of the 4th resistance, the other end ground connection of the 4th resistance.
Preferably, the model GM3101 of the middle control microcontroller.
Further, the input terminal of the output of pulse signal pin connection driving circuit of the middle control microcontroller, the driving
The primary coil of the output end connection transformer of circuit.
Further, the driving circuit includes the first triode, the 5th resistance, the 4th capacitance；The middle control microcontroller
Output of pulse signal pin connect one end of the 4th capacitance, the other end ground connection of the 4th capacitance；4th electricity
One end of the 5th resistance of one end connection of appearance, the base stage of the other end the first triode of connection of the 5th resistance, described first
The emitter of triode is grounded, and collector connects the primary coil of transformer.
Preferably, the signal amplification unit includes the second triode, third transistor, the first diode, the two or two pole
Pipe, the 5th capacitance；The base stage of second triode is transported by connecting the second of the 5th secondary high pass filter unit of capacitance connection
Calculate the output end of amplifier；The collector of second triode connects the anode of the first diode, second diode
Cathode connects the base stage of third transistor by connecting the 6th resistance；Microcontroller is controlled in the collector connection of the third transistor
Signal input part.
Preferably, the model LM358 of first operational amplifier.
Preferably, the signal output pin of the middle control microcontroller is also connected with audible alarm unit.
According to a kind of vehicle detection waveform shaping circuit that the utility model embodiment provides, high-pass filtering list twice is utilized
Member, the ultrasonic signal that ultrasonic wave receiving terminal is received carries out waved filter and shaping, and combines second of high-pass filtering list
The signal amplification unit of first output end connection, becomes square-wave signal by the ultrasonic wave sine wave signal shaping received, is sent to
Middle control microcontroller, middle control microcontroller control according to the square-wave signal and carry out audible alarm；Pass through high-pass filtering twice, it is ensured that ultrasound
The ultrasonic signal that wave receiving terminal obtains obtains sufficient gain amplifier, while to signal realize after multiple gain amplification
High progress filters out the purpose of harmonic wave and noise.
The additional aspect of the utility model and advantage will be set forth in part in the description, partly will be from following description
In become apparent, or recognized by the practice of the utility model.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination following accompanying drawings to embodiment
Become apparent and is readily appreciated that, wherein：
Fig. 1 is that a kind of circuit for vehicle detection waveform shaping circuit that the utility model embodiment provides connects block diagram；
Fig. 2 is a kind of circuit diagram for vehicle detection waveform shaping circuit that the utility model embodiment provides；
In figure：
T, ultrasonic wave transmitting terminal；R, ultrasonic wave receiving terminal；1, a high pass filter unit；2, secondary high pass filter unit,
3, signal amplification unit；4, middle control microcontroller；5, DC power supplier；6, transformer；7, driving circuit.
Specific implementation mode
The embodiments of the present invention are described below in detail, the example of embodiment is shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the utility model, and should not be understood as the limit to the utility model
System.
As shown in Figure 1, a kind of vehicle detection waveform shaping circuit of the utility model embodiment, is installed on vehicle, use
Whether there is barrier in test vehicle-surroundings；Including ultrasonic wave transmitting terminal T, transformer 6, ultrasonic wave receiving terminal R, a high pass filter
Wave unit 1, secondary high pass filter unit, signal amplification unit, middle control microcontroller 4 and DC power supplier 5；DC power supplier
4 power input of microcontroller is controlled in 5 connections, and ultrasonic wave transmitting terminal T is connected by transformer 6；Ultrasonic wave transmitting terminal T passes through drive
Dynamic circuit 7 controls the signal output pin of microcontroller 4 in connecting；Ultrasonic wave transmitting terminal T and ultrasonic wave receiving terminal R by ultrasonic wave into
Row communication, ultrasonic wave receiving terminal R, a high pass filter unit 1, secondary high pass filter unit, signal amplification unit are sequentially connected；
The signal input part of microcontroller 4 is controlled in the output end connection of signal amplification unit.The signal output pin of middle control microcontroller 4 also connects
Connect audible alarm unit.
Ultrasonic transmitter and receiver in the present apparatus are all made of UCM40.Piezoelectric ceramics generator (or sensor),
They are worked using the resonance of piezo-electric crystal.Inside piezoelectric-type ultrasonic wave producer there are two piezoelectric chip and
One sounding board.When applying the pulse signal for the natural mode shape that frequency is equal to piezoelectric chip between two pole pieces at it,
Piezoelectric chip will generate resonance, and drives resonance panel vibration and generate ultrasonic wave, be converted into mechanical energy by electric signal, this is
Ultrasonic transmitter.Conversely, when sounding board receives ultrasonic wave, compressing piezoelectric chip is generated into vibration, is converted by mechanical energy
As electric signal, at this moment just at ultrasonic receiver.
Preferably, the model GM3101 of middle control microcontroller 4.The model of first operational amplifier and second operational amplifier
For LM358.It should be noted that the middle citing for controlling microcontroller and operational amplifier model in the present embodiment, is not limited to above-mentioned
Citing can also be other modes, and details are not described herein.
In a preferred embodiment of the utility model, high pass filter unit 1 include the first operational amplifier,
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the first capacitance C1 and the second capacitance C2；Ultrasonic wave receives
One end of R connection first resistors R1, the other end of first resistor R1 is held to connect one end of the first capacitance C1, the first capacitance C1's is another
One end connects the inverting input of the first operational amplifier, and the positive input of the first operational amplifier is by connecting second resistance
R2 is grounded, and connect 3rd resistor R3 before the inverting input and output end of the first operational amplifier；First operational amplifier
Output end connects one end of the second capacitance C2, and the other end of the second capacitance C2 connects one end of the 4th resistance R4, the 4th resistance R4
The other end ground connection.
It should be noted that as shown in Fig. 2, the circuit structure of secondary high pass filter unit and a high pass filter unit phase
Together, details are not described herein.
Further, it is middle control microcontroller 4 output of pulse signal pin connection driving circuit input terminal, driving circuit it is defeated
Outlet connects the primary coil of transformer 6.Further, driving circuit includes the first triode Q1, the 5th resistance R5, the 4th electricity
Hold C4；The output of pulse signal pin of middle control microcontroller 4 connects one end of the 4th capacitance C4, another termination of the 4th capacitance C4
Ground；One end of 4th capacitance C4 connects one end of the 5th resistance R5, and the other end of the 5th resistance R5 connects the first triode Q1's
Base stage, the emitter ground connection of the first triode Q1, collector connect the primary coil of transformer 6.
Signal amplification unit include the second triode Q2, third transistor Q3, the first diode D1, the second diode R2,
5th capacitance C5；The base stage of second triode Q2 connects the second operation of secondary high pass filter unit by connecting the 5th capacitance C5
The output end of amplifier；The collector of second triode Q2 connects the anode of the first diode D1, the cathode of the second diode R2
By the base stage for connecting the 6th resistance R6 connection third transistors Q3；Control microcontroller 4 in the collector connection of third transistor
Signal input part.
According to a kind of vehicle detection waveform shaping circuit that the utility model embodiment provides, high-pass filtering list twice is utilized
Member, the ultrasonic signal that ultrasonic wave receiving terminal R is received carries out waved filter and shaping, and combines second of high-pass filtering list
The signal amplification unit of first output end connection, becomes square-wave signal by the ultrasonic wave sine wave signal shaping received, is sent to
Middle control microcontroller, middle control microcontroller control according to the square-wave signal and carry out audible alarm；Pass through high-pass filtering twice, it is ensured that ultrasound
The ultrasonic signal that wave receiving terminal R is obtained obtains sufficient gain amplifier, while it is real later to carry out multiple gain amplification to signal
The purpose that high progress filters out harmonic wave and noise is showed.
Middle control microcontroller executes internal processes and sends pulse to generate ultrasonic wave, is sent out by the P0-8 mouths of IC1, sends pulse
Frequency is 40kHz (frequency is that the efficiency that the ultrasonic wave of 40kHz or so is propagated in air is best), between pulse width and pulse
It is controlled every by program.Pulse width is about 125 μ s.Pulse sends interval and depends on maximum distance for requiring to measure etc..By three
Pole pipe 2N5551 amplifies signal, through pulse transformer T2 (no-load voltage ratios 1：10) after boosting, energy converter T is finally sent by ultrasonic wave
Electric impulse signal is converted into the ultrasonic directional of 40kHz toward external radiation.When the echo that ultrasonic wave encounters object reflection is received
Energy converter R is received, and since the echo-signal received when apart from farther out is weaker, the amplitude for being converted into electric signal is also smaller.Circuit
In use two-stage LM358 operational amplifiers ultra-weak electronic signal fully amplified.Amplified ac signal is sent into
8050 triodes, comparator export signal shaping for square-wave signal, after then being amplified again by next stage triode 8050, directly
Connect the P0-7 mouths for being input to IC1.Microprocessor in middle control single chip microcomputer makes an immediate response, and generates and reports voice output.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiments or example.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are not departing from the utility model
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.The scope of the utility model is by appended claims and its equivalent limits.
Claims (8)
1. a kind of vehicle detection waveform shaping circuit, is installed on vehicle, which is characterized in that including ultrasonic wave transmitting terminal, transformation
Device, ultrasonic wave receiving terminal, a high pass filter unit, secondary high pass filter unit, signal amplification unit, middle control microcontroller and straight
Galvanic electricity source module；Microcontroller power supply input terminal is controlled in the DC power supplier connection, and ultrasonic wave hair is connected by transformer
Penetrate end；The ultrasonic wave transmitting terminal controls the signal output pin of microcontroller in being connected by driving circuit；The ultrasonic wave transmitting
End is communicated with ultrasonic wave receiving terminal by ultrasonic wave, the ultrasonic wave receiving terminal, a high pass filter unit, secondary high pass
Filter unit, signal amplification unit are sequentially connected；The signal of control microcontroller is defeated in the output end connection of the signal amplification unit
Enter end.
2. vehicle detection waveform shaping circuit according to claim 1, which is characterized in that a high pass filter unit
Including the first operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the first capacitance and the second capacitance；Institute
One end of ultrasonic wave receiving terminal connection first resistor is stated, the other end of the first resistor connects one end of the first capacitance, described
The other end of first capacitance connects the inverting input of the first operational amplifier, the positive input of first operational amplifier
By connecting second resistance ground connection, 3rd resistor of connecting between the inverting input and output end of first operational amplifier；
The output end of first operational amplifier connects one end of the second capacitance, and the other end of second capacitance connects the 4th resistance
One end, the 4th resistance the other end ground connection.
3. vehicle detection waveform shaping circuit according to claim 1, which is characterized in that the model of the middle control microcontroller
For GM3101.
4. vehicle detection waveform shaping circuit according to claim 3, which is characterized in that the pulse of the middle control microcontroller
Signal output pin connects the input terminal of driving circuit, the primary coil of the output end connection transformer of the driving circuit.
5. vehicle detection waveform shaping circuit according to claim 4, which is characterized in that the driving circuit includes first
Triode, the 5th resistance, the 4th capacitance；The output of pulse signal pin of the middle control microcontroller connects the one of the 4th capacitance
End, the other end ground connection of the 4th capacitance；One end of 4th capacitance connects one end of the 5th resistance, the 5th resistance
The other end connect the first triode base stage, first triode emitter ground connection, collector connect transformer just
Grade coil.
6. vehicle detection waveform shaping circuit according to claim 1, which is characterized in that the signal amplification unit includes
Second triode, third transistor, the first diode, the second diode, the 5th capacitance；The base stage of second triode passes through
Connect the output end of the second operational amplifier of the 5th secondary high pass filter unit of capacitance connection；The current collection of second triode
Pole connects the anode of the first diode, and the cathode of second diode connects the base of third transistor by connecting the 6th resistance
Pole；The signal input part of microcontroller is controlled in the collector connection of the third transistor.
7. vehicle detection waveform shaping circuit according to claim 2, which is characterized in that first operational amplifier
Model LM358.
8. vehicle detection waveform shaping circuit according to claim 1, which is characterized in that the signal of the middle control microcontroller
Output pin is also connected with audible alarm unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721543768.9U CN207607448U (en) | 2017-11-17 | 2017-11-17 | Vehicle detection waveform shaping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721543768.9U CN207607448U (en) | 2017-11-17 | 2017-11-17 | Vehicle detection waveform shaping circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207607448U true CN207607448U (en) | 2018-07-13 |
Family
ID=62795689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721543768.9U Active CN207607448U (en) | 2017-11-17 | 2017-11-17 | Vehicle detection waveform shaping circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207607448U (en) |
-
2017
- 2017-11-17 CN CN201721543768.9U patent/CN207607448U/en active Active
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