CN221446292U - Ultrasonic ranging circuit and oil consumption instrument - Google Patents
Ultrasonic ranging circuit and oil consumption instrument Download PDFInfo
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- CN221446292U CN221446292U CN202322682769.3U CN202322682769U CN221446292U CN 221446292 U CN221446292 U CN 221446292U CN 202322682769 U CN202322682769 U CN 202322682769U CN 221446292 U CN221446292 U CN 221446292U
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Abstract
The utility model discloses an ultrasonic ranging circuit, which comprises: the device comprises a pulse transformer T, a socket XS2, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the primary side of the pulse transformer T is respectively connected with an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the secondary side of the pulse transformer T is connected with an ultrasonic probe through a socket XS 2; the ultrasonic wave transmitting circuit is used for amplifying ultrasonic wave signals generated by the singlechip to form transmitting waves; the wake wave eliminating circuit is used for discharging the energy of the primary side of the pulse transformer T so as to eliminate the transmitted wave wake wave; the ultrasonic receiving circuit is used for converting the received ultrasonic signal into an electric signal and performing filtering amplification treatment. The utility model also discloses an oil consumption instrument. The utility model solves the technical problems that the prior ultrasonic ranging cannot eliminate the emitted wave tail wave, and has a ranging blind area, so that the ultrasonic ranging cannot be accurately performed.
Description
Technical Field
The utility model relates to the technical field of ultrasonic ranging, in particular to an ultrasonic ranging circuit and an oil consumption meter.
Background
Ultrasonic ranging is obtained by emitting ultrasonic waves at an ultrasonic emitting device, multiplying the propagation speed of the ultrasonic waves in a medium by the time difference between the emitted waves and the received reflected echoes, and is similar to the radar ranging principle. The ultrasonic transmitter transmits ultrasonic waves to a certain direction, the timing is started at the same time of transmitting time, the ultrasonic waves propagate in the air, the ultrasonic waves immediately return when the ultrasonic waves hit an obstacle in the middle, and the timing is immediately stopped when the ultrasonic receiver receives reflected waves. In the ultrasonic ranging process, since some energy storage elements such as coils and the like exist in the transmitting circuit to form wake waves, if the distance is lower than a certain fixed value, the wake waves of the transmitted waves and the reflected echo are overlapped together, the true value of the distance cannot be measured, and the distance lower than the fixed value is called a blind area. Therefore, an ultrasonic ranging circuit and an oil consumption meter are needed to be provided, and the technical problems that the conventional ultrasonic ranging cannot eliminate the emitted wave tail wave, a ranging blind area exists, and thus the ultrasonic ranging cannot be accurately performed are solved.
Disclosure of utility model
The utility model mainly aims to provide an ultrasonic ranging circuit and an oil consumption meter, and aims to solve the technical problems that the conventional ultrasonic ranging cannot eliminate the tail wave of the emitted wave, and a ranging blind area exists, so that the ultrasonic ranging cannot be accurately performed.
In order to achieve the above object, the present utility model provides an ultrasonic ranging circuit, wherein the ultrasonic ranging circuit includes:
The device comprises a pulse transformer T, a socket XS2, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the primary side of the pulse transformer T is respectively connected with an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the secondary side of the pulse transformer T is connected with an ultrasonic probe through a socket XS 2; the ultrasonic wave transmitting circuit is used for amplifying ultrasonic wave signals generated by the singlechip to form transmitting waves; the wake wave elimination circuit is used for discharging the energy of the primary side of the pulse transformer T so as to eliminate the emitted wave wake wave; the ultrasonic receiving circuit is used for converting the received ultrasonic signals into electric signals and performing filtering amplification treatment.
In one of the preferred schemes, the wake wave elimination circuit comprises a resistor R51, a resistor R52, a level conversion circuit and a MOS switch tube Q2;
one end of the resistor R51 is connected with the power supply end, the other end of the resistor R51 is connected with the control end of the single chip microcomputer and the resistor R52 respectively, the other end of the resistor R52 is connected with the level conversion circuit, the other end of the level conversion circuit is connected with the grid electrode of the MOS switch tube Q2, the drain electrode of the MOS switch tube Q2 is connected with the 2 pin of the pulse transformer T, and the source electrode of the MOS switch tube Q2 is connected with the 1 pin of the pulse transformer.
In one of the preferred schemes, the level conversion circuit comprises a resistor R53 and a MOS tube V19; one end of the resistor R53 is connected with the power supply end, and the other end of the resistor R53 is respectively connected with the drain electrode of the MOS tube V19 and the grid electrode of the MOS switch tube Q2; the grid electrode of the MOS tube V19 is connected with the resistor R52, and the source electrode of the MOS tube V19 is grounded.
According to one of the preferred schemes, the ultrasonic wave transmitting circuit comprises a resistor R16, a resistor R19, a voltage amplifying circuit, a current amplifying circuit and a MOS tube V7; one end of the resistor R16 is connected with a power supply end, the other end of the resistor R16 is connected with a single chip microcomputer control end and a resistor R19 respectively, the other end of the resistor R19 is connected with a voltage amplifying circuit, the other end of the voltage amplifying circuit is connected with a 1 pin of the pulse transformer T and a current amplifying circuit respectively, the other end of the current amplifying circuit is connected with the 1 pin of the pulse transformer T and a grid electrode of the MOS tube V7 respectively, a drain electrode of the MOS tube V7 is connected with a 2 pin of the pulse transformer T, and a source electrode of the MOS tube V7 is grounded.
According to one of the preferred schemes, the voltage amplification circuit comprises a resistor R1 and an MOS tube V3, one end of the resistor R1 is connected with a power end and a 1 pin of a pulse transformer T respectively, the other end of the resistor R1 is connected with a drain electrode of the MOS tube V3 and the current amplification circuit, a grid electrode of the MOS tube V3 is connected with a resistor R19, and a source electrode of the MOS tube V3 is grounded.
In one of the preferred schemes, the current amplifying circuit comprises a triode V2 and a triode V4; the collector of triode V2 is connected with 1 pin of pulse transformer T, triode V2's projecting pole is connected with triode V4's projecting pole and MOS pipe V7's grid, triode V2's base is connected with voltage amplification circuit and triode V4's base respectively, triode V4's collector ground.
In one of the preferred schemes, the ultrasonic receiving circuit comprises a first amplifying and filtering circuit, and the first amplifying and filtering circuit is connected with the pulse transformer T;
The first amplifying and filtering circuit comprises an amplifier D3; the 1 pin of the amplifier D3 is respectively connected with a resistor R13 and a capacitor C9, the other end of the capacitor C9 is connected with a resistor R15, the other end of the resistor R15 is respectively connected with a resistor R26, a capacitor C16 and a capacitor C19, the other end of the capacitor C16 is respectively connected with a resistor R30 and the 7 pin of the amplifier D3, and the other end of the resistor R30 is respectively connected with the other end of the capacitor C19 and the 6 pin of the amplifier D3;
The pin 2 of the amplifier D3 is respectively connected with the other end of the resistor R13 and the resistor R12; the other end of the resistor R12 is respectively connected with the clamping circuit and the capacitor C5, and the other end of the capacitor C5 is connected with the 2 pin of the pulse transformer T;
the 3 pin of the amplifier D3 is connected with a resistor R18, and the other end of the resistor R18 is respectively connected with a capacitor C18, the 4 pin of the amplifier D3 and the ground end;
The 8 pin of the amplifier D3 is connected with a power supply end;
the other end of the 5 pin of the amplifier D3, the resistor R26 and the capacitor C18 is grounded.
In one of the preferred schemes, the ultrasonic receiving circuit further comprises a second amplifying and filtering circuit, and the second amplifying and filtering circuit is connected with the first amplifying and filtering circuit; the second amplifying and filtering circuit comprises an amplifier D4;
The 1 pin of the amplifier D4 is respectively connected with a resistor R28 and a capacitor C17, the other end of the capacitor C17 is connected with a singlechip, and the other end of the resistor R28 is connected with the 4 pin of the amplifier D4;
The pin 2 of the amplifier D4 is connected with a capacitor C28, and the other end of the capacitor C28 is grounded;
The 3 pin of the amplifier D4 is connected with a resistor R31, and the other end of the resistor R31 is grounded;
The 4 pin of the amplifier D4 is connected with a resistor R29, and the other end of the resistor R29 is connected with the 7 pin of the amplifier D3 through a capacitor C25;
And a 5 pin of the amplifier D4 is connected with a power supply end.
In one of the preferred embodiments, the ultrasonic receiving circuit further includes a comparing circuit; the comparison circuit is respectively connected with the second amplifying and filtering circuit and the singlechip; the comparison circuit comprises a comparator D2;
The 1 pin of the comparator D2 is respectively connected with a resistor R20, a resistor R24 and a capacitor C24, the other end of the resistor R20 is connected with a power supply end, and the other ends of the capacitor C24 and the resistor R24 are grounded;
The 3 pin of the comparator D2 is respectively connected with a resistor R17, a resistor R14 and a second amplifying and filtering circuit, the other end of the resistor R17 is connected with a power supply end, and the other end of the resistor R14 is grounded;
The pin 4 of the comparator D2 is respectively connected with a resistor R25, a resistor R23 and a capacitor C22, the other end of the resistor R25 is connected with a power end, the other end of the resistor R23 is connected with a singlechip, and the other end of the capacitor C22 is grounded;
The 2 pin of the comparator D2 is grounded, and the 5 pin of the comparator D2 is connected with a power supply end.
The utility model provides an oil consumption instrument, wherein the oil consumption instrument comprises the ultrasonic ranging circuit.
In the above technical solution of the present utility model, the ultrasonic ranging circuit includes: the device comprises a pulse transformer T, a socket XS2, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the primary side of the pulse transformer T is respectively connected with an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the secondary side of the pulse transformer T is connected with an ultrasonic probe through a socket XS 2; the ultrasonic wave transmitting circuit is used for amplifying ultrasonic wave signals generated by the singlechip to form transmitting waves; the wake wave elimination circuit is used for discharging the energy of the primary side of the pulse transformer T so as to eliminate the emitted wave wake wave; the ultrasonic receiving circuit is used for converting the received ultrasonic signals into electric signals and performing filtering amplification treatment. According to the utility model, the wake wave elimination circuit is arranged on the primary side of the pulse transformer T, so that energy is discharged to the primary side coil of the pulse transformer T, the transmitted wave wake wave is eliminated or shortened, and the technical problem that the conventional ultrasonic ranging cannot eliminate the transmitted wave wake wave, has a ranging blind area, and cannot accurately perform ultrasonic ranging is solved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings may be obtained from the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an ultrasonic ranging circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of an ultrasonic ranging circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a first amplifying filter circuit and a second amplifying filter circuit according to an embodiment of the present utility model;
Fig. 4 is a schematic diagram of a comparison circuit according to an embodiment of the utility model.
Reference numerals illustrate:
1. A pulse transformer T; 2. an ultrasonic wave transmitting circuit; 3. an ultrasonic wave receiving circuit; 4. a wake cancellation circuit; 5. an ultrasonic probe.
The achievement of the object, functional features and advantages of the present utility model will be further described with reference to the drawings in connection with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection claimed by the present utility model.
Referring to fig. 1-4, according to an aspect of the present utility model, there is provided an ultrasonic ranging circuit, wherein the ultrasonic ranging circuit includes:
A pulse transformer T1, a socket XS2, an ultrasonic wave transmitting circuit 2, an ultrasonic wave receiving circuit 3 and a wake wave eliminating circuit 4; the primary side of the pulse transformer T1 is respectively connected with an ultrasonic transmitting circuit 2, an ultrasonic receiving circuit 3 and a wake wave eliminating circuit 4; the secondary side of the pulse transformer T1 is connected with the ultrasonic probe 5 through a socket XS 2;
The ultrasonic wave transmitting circuit 2 is used for amplifying ultrasonic wave signals generated by the singlechip to form transmitting waves; the wake elimination circuit 4 is used for discharging the energy of the primary side of the pulse transformer T1 so as to eliminate the emitted wave wake; the ultrasonic receiving circuit 3 is used for converting a received ultrasonic signal into an electric signal and performing filtering amplification processing.
Specifically, in the present embodiment, the wake-up wave cancellation circuit 4 includes a resistor R51, a resistor R52, a level shift circuit, and a MOS switch transistor Q2; one end of the resistor R51 is connected with a power supply end, the other end of the resistor R51 is respectively connected with a singlechip control end and the resistor R52, the other end of the resistor R52 is connected with a level conversion circuit, the other end of the level conversion is connected with a grid electrode of the MOS switch tube Q2, a drain electrode of the MOS switch tube Q2 is connected with a pin 2 of the pulse transformer T1, and a source electrode of the MOS switch tube Q2 is connected with a pin 1 of the pulse transformer; wherein, the resistor R51 and the resistor R52 are current limiting resistors, so that the circuit device is prevented from being damaged due to overlarge current; the single chip microcomputer sends a 2M pulse, the wave_off1 signal is immediately operated to be high, the MOS switch tube Q2 is conducted at the moment, the primary coil of the pulse transformer T1 discharges energy through the MOS switch tube Q2, the wake wave is eliminated, the receiving interruption is opened after 20us, the dead zone is reduced to (20 us/2) 10 -6*1250*102 =1.25 cm at the moment, and the dead zone is greatly reduced.
Specifically, in this embodiment, the level conversion circuit includes a resistor R53 and a MOS transistor V19; one end of the resistor R53 is connected with the power supply end, and the other end of the resistor R53 is respectively connected with the drain electrode of the MOS tube V19 and the grid electrode of the MOS switch tube Q2; the grid electrode of the MOS tube V19 is connected with the resistor R52, and the source electrode of the MOS tube V19 is grounded; one end of the resistor R51 is connected with a 3V power supply end, and the level conversion circuit can convert a 3.3V power supply into a 10V power supply for output.
Specifically, in the present embodiment, the ultrasonic wave transmitting circuit 2 includes a resistor R16, a resistor R19, a voltage amplifying circuit, a current amplifying circuit, and a MOS transistor V7; one end of the resistor R16 is connected with a power supply end, the other end of the resistor R16 is connected with a single chip microcomputer control end and a resistor R19 respectively, the other end of the resistor R19 is connected with a voltage amplifying circuit, the other end of the voltage amplifying circuit is connected with a1 pin of a pulse transformer T1 and a current amplifying circuit respectively, the other end of the current amplifying circuit is connected with the 1 pin of the pulse transformer T1 and a grid electrode of a MOS tube V7 respectively, a drain electrode of the MOS tube V7 is connected with a2 pin of the pulse transformer T1, and a source electrode of the MOS tube V7 is grounded; the method comprises the steps that a tx_wave signal is output through a GPIO pin of a singlechip, the tx_wave signal is a high-level pulse signal with the frequency of 2M, when the singlechip is not controlled, the input end of an ultrasonic wave transmitting circuit 2 is low-level, the pulse signal is amplified in voltage and current through the ultrasonic wave transmitting circuit 2, and then is transmitted by an ultrasonic wave probe 5 through a pulse transformer T1; when the residual oil quantity in the mailbox is detected by ultrasonic waves, a pulse signal with the frequency of 2M is sent out by the singlechip, the waveform of the emitted wave is a 2M sine wave which lasts hundreds of microseconds due to the energy storage of a coil with pulse transformation and the parasitic capacitance of the MOS tube V7, if the oil level is not high enough, the echo and the emitted wave are easy to mix, so that the oil level height cannot be measured, the indistinguishable distance is a dead zone, the dead zone is calculated according to 200us, the dead zone is (200 us/2) 10 -6*1250*102 =12.5 cm, and the mailbox height of a general engineering vehicle is 80cm-100cm, and the dead zone is larger; when the ultrasonic wave transmitting circuit 2 is combined with the wake wave eliminating circuit 4, after the singlechip transmits a pulse signal with the period of 2M, the wave_off1 signal is immediately set, the drain electrode and the source electrode of the MOS switch tube Q2 are conducted, and the energy stored in the primary side coil of the pulse transformer T1 is released through short circuit, so that the time for transmitting the wake wave is shortened.
Specifically, in this embodiment, the voltage amplifying circuit includes a resistor R1 and a MOS tube V3, one end of the resistor R1 is connected to the power supply end and the 1 pin of the pulse transformer T1, the other end of the resistor R1 is connected to the drain of the MOS tube V3 and the current amplifying circuit, the gate of the MOS tube V3 is connected to the resistor R19, and the source of the MOS tube V3 is grounded; the input 3.3V voltage can be converted into 10V voltage output through the voltage amplifying circuit.
Specifically, in the present embodiment, the current amplifying circuit includes a transistor V2 and a transistor V4; the collector of the triode V2 is connected with the 1 pin of the pulse transformer T1, the emitter of the triode V2 is connected with the emitter of the triode V4 and the grid electrode of the MOS tube V7, the base of the triode V2 is respectively connected with the voltage amplifying circuit and the base of the triode V4, and the collector of the triode V4 is grounded; the current amplifying circuit amplifies the input current signal to increase the energy of the emitted wave, and then the pulse signal is transmitted to the pulse transformer T1, and the ultrasonic probe 5 is used for emitting.
Specifically, in the present embodiment, the ultrasonic wave receiving circuit 3 includes a first amplification filter circuit connected to a pulse transformer T1; the first amplifying and filtering circuit comprises an amplifier D3; the 1 pin of the amplifier D3 is respectively connected with a resistor R13 and a capacitor C9, the other end of the capacitor C9 is connected with a resistor R15, the other end of the resistor R15 is respectively connected with a resistor R26, a capacitor C16 and a capacitor C19, the other end of the capacitor C16 is respectively connected with a resistor R30 and the 7 pin of the amplifier D3, and the other end of the resistor R30 is respectively connected with the other end of the capacitor C19 and the 6 pin of the amplifier D3; the pin 2 of the amplifier D3 is respectively connected with the other end of the resistor R13 and the resistor R12; the other end of the resistor R12 is respectively connected with a clamping circuit and a capacitor C5, the other end of the capacitor C5 is connected with the 2 pin of the pulse transformer T1, and the capacitor C5 is used for isolating direct current and high-frequency signals and low-frequency signals so that direct current cannot pass through; the pin 3 of the amplifier D3 is connected with a resistor R18, and the other end of the resistor R18 is respectively connected with a capacitor C18, a capacitor C23, the pin 4 of the amplifier D3 and the ground; the pin 8 of the amplifier D3 is respectively connected with a power supply end, a capacitor C8 and a capacitor C13, and the other ends of the capacitor C8 and the capacitor C13 are grounded; the other ends of the pin 5 of the amplifier D3, the resistor R26, the capacitor C18 and the capacitor C23 are grounded; and amplifying and filtering the weak electric signal of the echo by the first amplifying and filtering circuit, wherein the amplification factor is about 100 times, and the 2M ultrasonic signal is selected by the high-pass filter.
Specifically, in the present embodiment, the clamping circuit includes a diode V5, a diode V6, and a resistor R10, one ends of the diode V5, the diode V6, and the resistor R10 are connected to the resistor R12, and the other ends of the diode V5, the diode V6, and the resistor R10 are grounded, and the pulse signal portion is fixed at a specified voltage value by the clamping circuit, and the original waveform shape is kept unchanged.
Specifically, in the present embodiment, the ultrasonic wave receiving circuit 3 further includes a second amplification filter circuit connected to the first amplification filter circuit; the second amplifying and filtering circuit comprises an amplifier D4; the 1 pin of the amplifier D4 is respectively connected with a resistor R28 and a capacitor C17, the other end of the capacitor C17 is connected with a singlechip, and the other end of the resistor R28 is connected with the 4 pin of the amplifier D4; the pin 2 of the amplifier D4 is connected with a capacitor C28, and the other end of the capacitor C28 is grounded; the 3 pin of the amplifier D4 is connected with a resistor R31, and the other end of the resistor R31 is grounded; the 4 pin of the amplifier D4 is connected with a resistor R29, and the other end of the resistor R29 is connected with the 7 pin of the amplifier D3 through a capacitor C25; the 5 pin of the amplifier D4 is respectively connected with a power end, a capacitor C12 and a capacitor C15, and the other ends of the capacitor C12 and the capacitor C15 are grounded; the second amplifying and filtering circuit performs secondary amplification on the signal passing through the first amplifying and filtering circuit, so that a final reflected echo signal is obtained.
Specifically, in the present embodiment, the ultrasonic wave receiving circuit 3 further includes a comparing circuit; the comparison circuit is respectively connected with the second amplifying and filtering circuit and the singlechip; the comparison circuit comprises a comparator D2; the 1 pin of the comparator D2 is respectively connected with a resistor R20, a resistor R24, a capacitor C27 and a capacitor C24, the other end of the resistor R20 is connected with a power supply end, and the other ends of the capacitor C24, the capacitor C27 and the resistor R24 are grounded; the 3 pin of the comparator D2 is respectively connected with a resistor R17, a resistor R14 and a second amplifying and filtering circuit, the other end of the resistor R17 is connected with a power supply end, and the other end of the resistor R14 is grounded; the pin 4 of the comparator D2 is respectively connected with a resistor R25, a resistor R23 and a capacitor C22, the other end of the resistor R25 is connected with a power end, the other end of the resistor R23 is connected with a singlechip, and the other end of the capacitor C22 is grounded; the 2 pin of the comparator D2 is grounded, the 5 pin of the comparator D2 is respectively connected with a capacitor C20, a capacitor C24 and a power supply end, and the other ends of the capacitor C20 and the capacitor C24 are grounded; after the echo of the ultrasonic wave returns to the probe, the ultrasonic probe 5 converts the echo energy into a weak electric signal, the weak electric signal is compared with the comparison voltage set by the comparison circuit after being filtered and amplified, if the signal is larger than the comparison voltage, the reflected echo signal is indicated to be received, the comparator outputs a first rising edge, an interrupt signal is generated to the singlechip, the singlechip records the time of transmitting the wave and the time of receiving the interrupt signal, and the time difference is the time of transmitting the ultrasonic wave in a medium.
According to another aspect of the utility model, the utility model provides a fuel consumption meter, wherein the fuel consumption meter comprises the ultrasonic ranging circuit.
The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather as utilizing equivalent structural changes made in the description of the present utility model and the accompanying drawings or directly/indirectly applied to other related technical fields under the inventive concept of the present utility model.
Claims (10)
1. An ultrasonic ranging circuit, comprising: the device comprises a pulse transformer T, a socket XS2, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit;
The primary side of the pulse transformer T is respectively connected with an ultrasonic transmitting circuit, an ultrasonic receiving circuit and a wake wave eliminating circuit; the secondary side of the pulse transformer T is connected with an ultrasonic probe through a socket XS 2; the ultrasonic wave transmitting circuit is used for amplifying ultrasonic wave signals generated by the singlechip to form transmitting waves; the wake wave elimination circuit is used for discharging the energy of the primary side of the pulse transformer T so as to eliminate the emitted wave wake wave; the ultrasonic receiving circuit is used for converting the received ultrasonic signals into electric signals and performing filtering amplification treatment.
2. The ultrasonic ranging circuit according to claim 1, wherein the wake cancellation circuit comprises a resistor R51, a resistor R52, a level shift circuit and a MOS switch transistor Q2;
one end of the resistor R51 is connected with the power supply end, the other end of the resistor R51 is connected with the control end of the single chip microcomputer and the resistor R52 respectively, the other end of the resistor R52 is connected with the level conversion circuit, the other end of the level conversion circuit is connected with the grid electrode of the MOS switch tube Q2, the drain electrode of the MOS switch tube Q2 is connected with the 2 pin of the pulse transformer T, and the source electrode of the MOS switch tube Q2 is connected with the 1 pin of the pulse transformer.
3. The ultrasonic ranging circuit according to claim 2, wherein the level conversion circuit comprises a resistor R53 and a MOS transistor V19; one end of the resistor R53 is connected with the power supply end, and the other end of the resistor R53 is respectively connected with the drain electrode of the MOS tube V19 and the grid electrode of the MOS switch tube Q2; the grid electrode of the MOS tube V19 is connected with the resistor R52, and the source electrode of the MOS tube V19 is grounded.
4. An ultrasonic ranging circuit according to any one of claims 1 to 3, wherein the ultrasonic transmitting circuit comprises a resistor R16, a resistor R19, a voltage amplifying circuit, a current amplifying circuit and a MOS transistor V7; one end of the resistor R16 is connected with a power supply end, the other end of the resistor R16 is connected with a single chip microcomputer control end and a resistor R19 respectively, the other end of the resistor R19 is connected with a voltage amplifying circuit, the other end of the voltage amplifying circuit is connected with a 1 pin of the pulse transformer T and a current amplifying circuit respectively, the other end of the current amplifying circuit is connected with the 1 pin of the pulse transformer T and a grid electrode of the MOS tube V7 respectively, a drain electrode of the MOS tube V7 is connected with a 2 pin of the pulse transformer T, and a source electrode of the MOS tube V7 is grounded.
5. The ultrasonic ranging circuit according to claim 4, wherein the voltage amplifying circuit comprises a resistor R1 and a MOS tube V3, one end of the resistor R1 is connected with a power end and a1 pin of the pulse transformer T respectively, the other end of the resistor R1 is connected with a drain electrode of the MOS tube V3 and the current amplifying circuit, a grid electrode of the MOS tube V3 is connected with a resistor R19, and a source electrode of the MOS tube V3 is grounded.
6. The ultrasonic ranging circuit of claim 4, wherein the current amplifying circuit comprises a transistor V2 and a transistor V4; the collector of triode V2 is connected with 1 pin of pulse transformer T, triode V2's projecting pole is connected with triode V4's projecting pole and MOS pipe V7's grid, triode V2's base is connected with voltage amplification circuit and triode V4's base respectively, triode V4's collector ground.
7. An ultrasonic ranging circuit according to any one of claims 1 to 3, wherein the ultrasonic receiving circuit comprises a first amplifying filter circuit connected to a pulse transformer T;
The first amplifying and filtering circuit comprises an amplifier D3; the 1 pin of the amplifier D3 is respectively connected with a resistor R13 and a capacitor C9, the other end of the capacitor C9 is connected with a resistor R15, the other end of the resistor R15 is respectively connected with a resistor R26, a capacitor C16 and a capacitor C19, the other end of the capacitor C16 is respectively connected with a resistor R30 and the 7 pin of the amplifier D3, and the other end of the resistor R30 is respectively connected with the other end of the capacitor C19 and the 6 pin of the amplifier D3;
The pin 2 of the amplifier D3 is respectively connected with the other end of the resistor R13 and the resistor R12; the other end of the resistor R12 is respectively connected with the clamping circuit and the capacitor C5, and the other end of the capacitor C5 is connected with the 2 pin of the pulse transformer T;
the 3 pin of the amplifier D3 is connected with a resistor R18, and the other end of the resistor R18 is respectively connected with a capacitor C18, the 4 pin of the amplifier D3 and the ground end;
The 8 pin of the amplifier D3 is connected with a power supply end;
the other end of the 5 pin of the amplifier D3, the resistor R26 and the capacitor C18 is grounded.
8. The ultrasonic ranging circuit of claim 7, wherein the ultrasonic receiving circuit further comprises a second amplifying filter circuit, the second amplifying filter circuit being connected to the first amplifying filter circuit; the second amplifying and filtering circuit comprises an amplifier D4;
The 1 pin of the amplifier D4 is respectively connected with a resistor R28 and a capacitor C17, the other end of the capacitor C17 is connected with a singlechip, and the other end of the resistor R28 is connected with the 4 pin of the amplifier D4;
The pin 2 of the amplifier D4 is connected with a capacitor C28, and the other end of the capacitor C28 is grounded;
The 3 pin of the amplifier D4 is connected with a resistor R31, and the other end of the resistor R31 is grounded;
The 4 pin of the amplifier D4 is connected with a resistor R29, and the other end of the resistor R29 is connected with the 7 pin of the amplifier D3 through a capacitor C25;
And a 5 pin of the amplifier D4 is connected with a power supply end.
9. The ultrasonic ranging circuit of claim 8, wherein the ultrasonic receiving circuit further comprises a comparison circuit; the comparison circuit is respectively connected with the second amplifying and filtering circuit and the singlechip; the comparison circuit comprises a comparator D2;
The 1 pin of the comparator D2 is respectively connected with a resistor R20, a resistor R24 and a capacitor C24, the other end of the resistor R20 is connected with a power supply end, and the other ends of the capacitor C24 and the resistor R24 are grounded;
The 3 pin of the comparator D2 is respectively connected with a resistor R17, a resistor R14 and a second amplifying and filtering circuit, the other end of the resistor R17 is connected with a power supply end, and the other end of the resistor R14 is grounded;
The pin 4 of the comparator D2 is respectively connected with a resistor R25, a resistor R23 and a capacitor C22, the other end of the resistor R25 is connected with a power end, the other end of the resistor R23 is connected with a singlechip, and the other end of the capacitor C22 is grounded;
The 2 pin of the comparator D2 is grounded, and the 5 pin of the comparator D2 is connected with a power supply end.
10. A fuel consumption meter, characterized in that it comprises an ultrasonic ranging circuit according to any one of claims 1-9.
Priority Applications (1)
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| CN202322682769.3U CN221446292U (en) | 2023-10-08 | 2023-10-08 | Ultrasonic ranging circuit and oil consumption instrument |
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| CN202322682769.3U CN221446292U (en) | 2023-10-08 | 2023-10-08 | Ultrasonic ranging circuit and oil consumption instrument |
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