CN209946379U - Ultrasonic echo receiving circuit - Google Patents
Ultrasonic echo receiving circuit Download PDFInfo
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- CN209946379U CN209946379U CN201920220134.2U CN201920220134U CN209946379U CN 209946379 U CN209946379 U CN 209946379U CN 201920220134 U CN201920220134 U CN 201920220134U CN 209946379 U CN209946379 U CN 209946379U
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Abstract
The utility model discloses an ultrasonic wave echo receiving circuit. Ultrasonic wave echo signal is unstable, and the interference killing feature is weak, and clutter signal is difficult to filter. The utility model discloses a voltage stabilization module stabilizes the 24V voltage of external input into 15V voltage VCC2 through voltage stabilization chip and supplies power to the voltage conversion module, and the voltage inverting module and the singlechip are both supplied power by voltage VCC; the voltage conversion module receives the voltage VCC2 output by the voltage stabilization module and outputs a voltage VCC 1; the voltage inverting module inverts the phase of the square wave output by the singlechip and transmits the inverted phase to the voltage conversion module, and the output voltage VCC1 of the voltage conversion module is controlled, so that the on-off of the echo amplification module is controlled; and when the echo amplification module is switched on, the echo signal received by the ultrasonic probe is amplified, then is filtered by the band-pass filter circuit module and rectified by the rectification module in sequence, and finally is transmitted to the singlechip. The utility model discloses can guarantee that echo signal is more stable, the interference killing feature is stronger.
Description
Technical Field
The utility model belongs to the technical field of ultrasonic ranging, concretely relates to ultrasonic echo receiving circuit.
Background
With the continuous improvement of the technological level, the ultrasonic ranging technology is widely applied to daily work and life of people. The general ultrasonic wave can be used for measuring distance, material level and liquid level, and is suitable for measuring the interior of a building, the liquid level and the like. Ultrasonic waves refer to sound waves with a frequency above 20kHz, which fall into the category of mechanical waves. With the continuous development of electronic measurement technology, the electronic measurement technology is more and more widely applied, the ultrasonic measurement technology is also widely applied, and ultrasonic waves are favored due to high measurement accuracy, low cost and stable performance. The ultrasonic wave also follows the propagation rule of general mechanical waves in an elastic medium, such as reflection and refraction phenomena at the interface of the medium, attenuation caused by absorption by the medium after entering the medium, and the like. Because of the existence of these interference factors, the echo signal is unstable, the anti-interference capability is weak, and the clutter signal is difficult to filter, so that how to screen the ultrasonic echo to be received in a complex environment becomes a big problem, and is also a key ring directly influencing the measurement accuracy, so the quality of the ultrasonic receiving circuit directly influences the accuracy of the ultrasonic measurement.
Disclosure of Invention
An object of the utility model is to provide an ultrasonic wave echo receiving circuit that can accurate and stable receiving ultrasonic wave.
The utility model discloses a voltage stabilization module, voltage reverse phase module, singlechip, voltage conversion module, echo amplification module, band-pass filter circuit module, rectifier module and ultrasonic transducer. The voltage stabilizing module stabilizes the externally input 24V voltage into 15V voltage VCC2 through a voltage stabilizing chip and supplies the voltage to the voltage conversion module, and the voltage inverting module and the single chip microcomputer are both supplied with power by the voltage VCC. The voltage conversion module receives the voltage VCC2 output by the voltage stabilization module and outputs a voltage VCC 1. The voltage inverting module inverts the phase of the square wave output by the singlechip and then transmits the inverted phase to the voltage conversion module, and the output voltage VCC1 of the voltage conversion module is controlled, so that the on-off of the echo amplification module is controlled. And when the echo amplification module is switched on, the echo signal received by the ultrasonic probe is amplified, then is filtered by the band-pass filter circuit module and rectified by the rectification module in sequence, and finally is transmitted to the singlechip.
The band-pass filter circuit module screens signals through two stages of band-pass filters.
The rectifier module converts the sinusoidal signal into a positive impact signal.
The voltage stabilizing module comprises a voltage stabilizing chip U3, and the LM317 chip is adopted by the voltage stabilizing chip U3. The 24V voltage is connected with the input end of the voltage stabilizing chip U3; one end of an eighteenth resistor R18 is connected with the output end of the voltage-stabilizing chip U3, and the other end of the eighteenth resistor R18 is connected with the adjusting end of the voltage-stabilizing chip U3, the anode of the first electrolytic capacitor CD4 and the cathode of the fifth voltage-stabilizing diode D5; the cathode of the fourth electrolytic capacitor CD4 and the other end of the fifth zener diode D5 are both grounded. The regulation terminal of the regulator chip U3 outputs a 15V voltage VCC 2.
The voltage inverting module comprises a six-phase inverter U5, wherein the six-phase inverter U5 adopts an MC74HC04ADG chip; one end of the twenty-first resistor R21 is connected with a voltage VCC, the other end of the twenty-first resistor R21 is connected with an A4 pin of a six-phase inverter U5, and an A4 pin of the six-phase inverter U5 is connected with a square wave output by the single chip microcomputer; a VCC pin of the six-phase inverter U5 is connected with one end of a twenty-first capacitor C21 and voltage VCC, and the other end of the twenty-first capacitor C21 is grounded; the GND pin of the six-phase inverter U5 is grounded; the Y4 pin of the six-inverter U5 outputs a signal VCC1 CON; the remaining pins of the six-inverter U5 are all floating.
The single chip microcomputer adopts an ATMEGA1284P chip. Pins 5, 17 and 38 of the single chip are all connected with a voltage VCC; the 4 pins of the singlechip are connected with one end of a nineteenth resistor R19 and one end of an eighteenth capacitor C18, the other end of the nineteenth resistor R19 is connected with a voltage VCC, and the other end of the eighteenth capacitor C18 is grounded; pins 6, 18, 28 and 39 of the singlechip are all grounded; one end of a nineteenth capacitor C19 at a 29 pin of the singlechip, and a 27 pin of the singlechip are connected with one end of a twentieth capacitor C20 and one end of a twentieth resistor R20; the other ends of the nineteenth capacitor C19 and the twentieth capacitor C20 are both grounded; the other end of the twentieth resistor R20 is connected with the voltage VCC; the 12 pins of the singlechip output square waves; the 30 pins of the singlechip are connected with rectification signals output by the rectification module; the rest pins of the singlechip are all suspended.
The voltage conversion module comprises an ultra-low dropout adjustable voltage regulator U2, and an ultra-low dropout adjustable voltage regulator U2 adopts an LP2980IM5-5.0 chip; the VIN pin of the ultra-low voltage difference adjustable voltage stabilizer U2 is connected with one end of a seventeenth resistor R17 and the anode of a second electrolytic capacitor CD2, and the other end of the seventeenth resistor R17 is connected with the output voltage VCC2 of the voltage stabilizing module; the negative electrode of the second electrolytic capacitor CD2 is grounded; the GND pin of the ultra-low dropout adjustable voltage regulator U2 is grounded; the ON/OFF pin of the ultra-low voltage difference adjustable voltage stabilizer U2 is connected with an output signal VCC1CON of a voltage inversion module; the VOUT pin of the ultra-low voltage difference adjustable voltage stabilizer U2 is connected with the anode of a third electrolytic capacitor CD3, and the cathode of the third electrolytic capacitor CD3 is grounded; the output voltage VCC1 of the VOUT pin of the ultra-low dropout adjustable voltage regulator U2; the rest pins of the ultra-low dropout adjustable voltage regulator U2 are grounded.
The echo amplifying module comprises a triode Q1, and the model of the triode Q1 is S9013; an emitter of the triode Q1 is connected with one end of a sixteenth resistor R16, and the other end of the sixteenth resistor R16 is grounded; the collector of the triode Q1 is connected with one end of the fifth resistor R5 and one end of the ninth resistor R9; the other end of the fifth resistor R5 is connected with one end of the first capacitor C1 and is connected with the output voltage VCC1 of the voltage conversion module; the other end of the first capacitor C1 is grounded; the base of the triode Q1 is connected with the other end of the ninth resistor R9 and one end of the twelfth resistor R12; the base electrode of the triode Q1 outputs an amplified signal; the other end of the twelfth resistor R12 is connected with one end of a thirteenth capacitor C13; the other end of the thirteenth capacitor C13 is connected to the anode of the fourth diode D4, the cathode of the third diode D3 and one end of the eleventh resistor R11; the anode of the third diode D3 and the cathode of the fourth diode D4 are both grounded; the other end of the eleventh resistor R11 is connected with one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 is connected to the echo signal of the ultrasonic probe.
The band-pass filter circuit module comprises a first operational amplifier U1B and a second operational amplifier U1A; the non-inverting input end of the first amplifier U1B is connected with the non-inverting input end of the second amplifier U1A, one end of a fourteenth capacitor C14, one end of a fourteenth resistor R14 and one end of a thirteenth resistor R13; the other end of the fourteenth capacitor C14 and the other end of the fourteenth resistor R14 are both grounded; the other end of the thirteenth resistor R13 is connected with one end of a fifteenth resistor R15, one end of a fifteenth capacitor C15, the anode of the first electrolytic capacitor CD1 and the positive power supply end of the second operational amplifier U1A; the other end of the fifteenth capacitor C15 and the negative electrode of the first electrolytic capacitor CD1 are both grounded; the other end of the fifteenth resistor R15 is connected with the output voltage VCC1 of the voltage conversion module; the inverting input of the first amplifier U1B is connected to one end of the third resistor R3 and one end of the fifth capacitor C5; the other end of the fifth capacitor C5 is connected with one end of the sixth resistor R6, one end of the first resistor R1 and one end of the second capacitor C2; the other end of the sixth resistor R6 is connected with one end of the fourth capacitor C4; the other end of the fourth capacitor C4 is connected with the amplified signal output by the echo amplification module; the other end of the first resistor R1 is grounded; the other end of the second capacitor C2 is connected to the other end of the third resistor R3, the output end of the first operational amplifier U1B, one end of the eleventh capacitor C11 and one end of the sixth capacitor C6; the other end of the eleventh capacitor C11 is grounded; the other end of the sixth capacitor C6 is connected with one end of the seventh resistor R7; the other end of the seventh resistor R7 is connected with one end of the seventh capacitor C7, one end of the second resistor R2 and one end of the third capacitor C3; the other end of the second resistor R2 is grounded; the other end of the seventh capacitor C7 is connected to the inverting input terminal of the second operational amplifier U1A and one end of the fourth resistor R4; the other end of the third capacitor C3 is connected to the other end of the fourth resistor R4, the output end of the second operational amplifier U1A and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 is grounded; the negative power supply end of the second operational amplifier U1A is grounded; the output of the second operational amplifier U1A outputs a filtered signal.
The rectifying module comprises a first diode D1 and a second diode D2; one end of the eighth capacitor C8 is connected with the filtering signal output by the band-pass filter module; the other end of the eighth capacitor C8 is connected to the anode of the first diode D1 and the cathode of the second diode D2; the anode of the second diode D2 is grounded; the cathode of the first diode D2 is connected to one end of the tenth resistor R10, one end of the tenth capacitor C10 and one end of the eighth resistor R8; the other end of the tenth resistor R10 and the other end of the tenth capacitor C10 are both grounded; the other end of the eighth resistor R8 outputs a rectified signal.
The utility model discloses beneficial effect who has:
1. the utility model discloses take care of echo signal through the signal, filtering clutter signal effectively, and can guarantee that echo signal is more stable, the interference killing feature is stronger.
2. The utility model discloses echo signal after taking care of changes in singlechip identification processing, and can improve measurement accuracy.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
fig. 2 is a schematic circuit diagram of the voltage stabilizing module of the present invention;
FIG. 3 is a schematic circuit diagram of the medium voltage inverter module according to the present invention;
FIG. 4 is a schematic circuit diagram of a single chip computer of the present invention;
fig. 5 is a schematic circuit diagram of the medium voltage conversion module according to the present invention;
fig. 6 is a schematic circuit diagram of the echo amplifying module according to the present invention;
fig. 7 is a schematic circuit diagram of the middle band-pass filter circuit module according to the present invention;
fig. 8 is a schematic circuit diagram of the middle rectifier module of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the ultrasonic receiving circuit includes a voltage stabilizing module 101, a voltage inverting module 102, a single chip microcomputer 103, a voltage converting module 104, an echo amplifying module 105, a band-pass filter circuit module 106, a rectifying module 107, and an ultrasonic probe 108. The voltage stabilizing module 101 stabilizes the externally input 24V voltage to 15V voltage VCC2 through a voltage stabilizing chip and supplies the voltage to the voltage converting module 104, and the voltage inverting module 102 and the single chip microcomputer 103 are both supplied with power by 3.3V voltage VCC. The voltage conversion module 104 receives the voltage VCC2 output by the voltage regulation module 101 and outputs a voltage VCC 1. The voltage inverting module 102 inverts the phase of the square wave output by the single chip microcomputer 103 and transmits the inverted phase to the voltage converting module 104, so as to control the magnitude of the output voltage VCC1 of the voltage converting module 104, thereby controlling the on/off of the echo amplifying module 105. When the echo amplifying module 105 is turned on, the echo signal received by the ultrasonic probe 108 is amplified, then is filtered by the band-pass filter circuit module 106 and rectified by the rectifying module 107 in sequence, and finally is transmitted to the single chip microcomputer 103.
The band-pass filter circuit module 106 filters out a signal with a certain frequency through two stages of band-pass filters. The rectifier module 107 converts the sinusoidal signal into a positive going surge signal.
As shown in fig. 2, the regulator module 101 includes a regulator chip U3, and the regulator chip U3 is an LM317 chip. The 24V voltage is connected with the input end of the voltage stabilizing chip U3; one end of an eighteenth resistor R18 is connected with the output end of the voltage-stabilizing chip U3, and the other end of the eighteenth resistor R18 is connected with the adjusting end of the voltage-stabilizing chip U3, the anode of the first electrolytic capacitor CD4 and the cathode of the fifth voltage-stabilizing diode D5; the cathode of the fourth electrolytic capacitor CD4 and the other end of the fifth zener diode D5 are both grounded. The regulation terminal of the regulator chip U3 outputs a 15V voltage VCC 2.
As shown in fig. 3, the voltage inverting module 102 includes a six-inverter U5, the six-inverter U5 employs an MC74HC04ADG chip; one end of the twenty-first resistor R21 is connected with a voltage VCC, the other end of the twenty-first resistor R21 is connected with an A4 pin of a six-phase inverter U5, and an A4 pin of the six-phase inverter U5 is connected with a square wave output by the singlechip 103; a VCC pin of the six-phase inverter U5 is connected with one end of a twenty-first capacitor C21 and voltage VCC, and the other end of the twenty-first capacitor C21 is grounded; the GND pin of the six-phase inverter U5 is grounded; the Y4 pin of the six-inverter U5 outputs a signal VCC1 CON; the remaining pins of the six-inverter U5 are all floating.
As shown in fig. 4, the single chip microcomputer 103 employs an ATMEGA1284P chip. Pins 5, 17 and 38 of the singlechip 103 are all connected with a voltage VCC; the 4 pins of the singlechip 103 are connected with one end of a nineteenth resistor R19 and one end of an eighteenth capacitor C18, the other end of the nineteenth resistor R19 is connected with a voltage VCC, and the other end of the eighteenth capacitor C18 is grounded; pins 6, 18, 28 and 39 of the singlechip 103 are all grounded; one end of a nineteenth capacitor C19 at a 29 pin of the singlechip 103, and a 27 pin of the singlechip 103 are connected with one end of a twentieth capacitor C20 and one end of a twentieth resistor R20; the other ends of the nineteenth capacitor C19 and the twentieth capacitor C20 are both grounded; the other end of the twentieth resistor R20 is connected with the voltage VCC; the 12 pins of the singlechip 103 output square waves; a pin 30 of the singlechip 103 is connected with a rectification signal output by the rectification module 107; the rest pins of the singlechip 103 are all suspended.
As shown in fig. 5, the voltage conversion module 104 includes an ultra low dropout adjustable regulator U2, and the ultra low dropout adjustable regulator U2 adopts an LP2980IM5-5.0 chip; the VIN pin of the ultra-low dropout adjustable voltage regulator U2 is connected with one end of a seventeenth resistor R17 and the anode of a second electrolytic capacitor CD2, and the other end of the seventeenth resistor R17 is connected with the output voltage VCC2 of the voltage stabilizing module 101; the negative electrode of the second electrolytic capacitor CD2 is grounded; the GND pin of the ultra-low dropout adjustable voltage regulator U2 is grounded; the ON/OFF pin of the ultra-low dropout adjustable voltage regulator U2 is connected with an output signal VCC1CON of the voltage inversion module 102; the VOUT pin of the ultra-low voltage difference adjustable voltage stabilizer U2 is connected with the anode of a third electrolytic capacitor CD3, and the cathode of the third electrolytic capacitor CD3 is grounded; the output voltage VCC1 of the VOUT pin of the ultra-low dropout adjustable voltage regulator U2; the rest pins of the ultra-low dropout adjustable voltage regulator U2 are grounded.
As shown in fig. 6, the echo amplifying module 105 includes a transistor Q1, the model of the transistor Q1 is S9013; an emitter of the triode Q1 is connected with one end of a sixteenth resistor R16, and the other end of the sixteenth resistor R16 is grounded; the collector of the triode Q1 is connected with one end of the fifth resistor R5 and one end of the ninth resistor R9; the other end of the fifth resistor R5 is connected to one end of the first capacitor C1 and connected to the output voltage VCC1 of the voltage conversion module 104; the other end of the first capacitor C1 is grounded; the base of the triode Q1 is connected with the other end of the ninth resistor R9 and one end of the twelfth resistor R12; the base electrode of the triode Q1 outputs an amplified signal; the other end of the twelfth resistor R12 is connected with one end of a thirteenth capacitor C13; the other end of the thirteenth capacitor C13 is connected to the anode of the fourth diode D4, the cathode of the third diode D3 and one end of the eleventh resistor R11; the anode of the third diode D3 and the cathode of the fourth diode D4 are both grounded; the other end of the eleventh resistor R11 is connected with one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 is connected to the echo signal TRANS of the ultrasonic probe 108.
As shown in fig. 7, the band-pass filter circuit block 106 includes a first operational amplifier U1B and a second operational amplifier U1A; the non-inverting input end of the first amplifier U1B is connected with the non-inverting input end of the second amplifier U1A, one end of a fourteenth capacitor C14, one end of a fourteenth resistor R14 and one end of a thirteenth resistor R13; the other end of the fourteenth capacitor C14 and the other end of the fourteenth resistor R14 are both grounded; the other end of the thirteenth resistor R13 is connected with one end of a fifteenth resistor R15, one end of a fifteenth capacitor C15, the anode of the first electrolytic capacitor CD1 and the positive power supply end of the second operational amplifier U1A; the other end of the fifteenth capacitor C15 and the negative electrode of the first electrolytic capacitor CD1 are both grounded; the other end of the fifteenth resistor R15 is connected to the output voltage VCC1 of the voltage conversion module 104; the inverting input of the first amplifier U1B is connected to one end of the third resistor R3 and one end of the fifth capacitor C5; the other end of the fifth capacitor C5 is connected with one end of the sixth resistor R6, one end of the first resistor R1 and one end of the second capacitor C2; the other end of the sixth resistor R6 is connected with one end of the fourth capacitor C4; the other end of the fourth capacitor C4 is connected with the amplified signal output by the echo amplification module; the other end of the first resistor R1 is grounded; the other end of the second capacitor C2 is connected to the other end of the third resistor R3, the output end of the first operational amplifier U1B, one end of the eleventh capacitor C11 and one end of the sixth capacitor C6; the other end of the eleventh capacitor C11 is grounded; the other end of the sixth capacitor C6 is connected with one end of the seventh resistor R7; the other end of the seventh resistor R7 is connected with one end of the seventh capacitor C7, one end of the second resistor R2 and one end of the third capacitor C3; the other end of the second resistor R2 is grounded; the other end of the seventh capacitor C7 is connected to the inverting input terminal of the second operational amplifier U1A and one end of the fourth resistor R4; the other end of the third capacitor C3 is connected to the other end of the fourth resistor R4, the output end of the second operational amplifier U1A and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 is grounded; the negative power supply end of the second operational amplifier U1A is grounded; the output of the second operational amplifier U1A outputs a filtered signal. Because the first operational amplifier U1B and the second operational amplifier U1A have low offset voltage and zero temperature drift, the echo signals are more stable, and the anti-jamming capability is stronger.
As shown in fig. 8, the rectifying module 107 includes a first diode D1 and a second diode D2; one end of the eighth capacitor C8 is connected to the filtered signal output by the band-pass filter module 106; the other end of the eighth capacitor C8 is connected to the anode of the first diode D1 and the cathode of the second diode D2; the anode of the second diode D2 is grounded; the cathode of the first diode D2 is connected to one end of the tenth resistor R10, one end of the tenth capacitor C10 and one end of the eighth resistor R8; the other end of the tenth resistor R10 and the other end of the tenth capacitor C10 are both grounded; the other end of the eighth resistor R8 outputs a rectified signal Sig Out. The rectifying module converts the complex echo signals into signals which are easier to process by the single chip microcomputer, so that the measurement precision is further improved.
In the voltage stabilizing module 101, the eighteenth resistor R18 plays a role of current limiting, and protects the voltage stabilizing chip U3 from being burned out; the fourth electrolytic capacitor CD4 plays a role in filtering, so that the output signal is more stable; the fifth zener diode D5 is a 15V zener diode, so that the output voltage VCC2 is stabilized at 15V.
In the voltage inverting module 102, a twenty-first resistor R21 is used as a pull-up resistor, clamps an uncertain signal at a high level through a resistor and plays a role in limiting current; the twenty-first capacitor C21 acts as a filter.
The band-pass filter module 106 selects the echo with the center frequency of 21.85KHz and the bandwidth of 4.08KHz and outputs the echo to the singlechip.
Claims (10)
1. Ultrasonic wave echo receiving circuit, including steady voltage module, voltage reverse phase module, singlechip, voltage conversion module, echo amplification module, band-pass filter circuit module, rectifier module and ultrasonic transducer, its characterized in that: the voltage stabilizing module is used for stabilizing the externally input 24V voltage into 15V voltage VCC2 through a voltage stabilizing chip and supplying the 15V voltage to the voltage conversion module, and the voltage inverting module and the single chip microcomputer are both supplied with power by the voltage VCC; the voltage conversion module receives the voltage VCC2 output by the voltage stabilization module and outputs a voltage VCC 1; the voltage inverting module inverts the phase of the square wave output by the singlechip and transmits the inverted phase to the voltage conversion module, and the output voltage VCC1 of the voltage conversion module is controlled, so that the on-off of the echo amplification module is controlled; and when the echo amplification module is switched on, the echo signal received by the ultrasonic probe is amplified, then is filtered by the band-pass filter circuit module and rectified by the rectification module in sequence, and finally is transmitted to the singlechip.
2. An ultrasonic echo receiving circuit according to claim 1, wherein: the band-pass filter circuit module screens signals through two stages of band-pass filters.
3. An ultrasonic echo receiving circuit according to claim 1, wherein: the rectifier module converts the sinusoidal signal into a positive impact signal.
4. An ultrasonic echo receiving circuit according to claim 1, wherein: the voltage stabilizing module comprises a voltage stabilizing chip U3, and the voltage stabilizing chip U3 adopts an LM317 chip; the 24V voltage is connected with the input end of the voltage stabilizing chip U3; one end of an eighteenth resistor R18 is connected with the output end of the voltage-stabilizing chip U3, and the other end of the eighteenth resistor R18 is connected with the adjusting end of the voltage-stabilizing chip U3, the anode of the first electrolytic capacitor CD4 and the cathode of the fifth voltage-stabilizing diode D5; the cathode of the fourth electrolytic capacitor CD4 and the other end of the fifth voltage-stabilizing diode D5 are both grounded; the regulation terminal of the regulator chip U3 outputs a 15V voltage VCC 2.
5. An ultrasonic echo receiving circuit according to claim 1, wherein: the voltage inverting module comprises a six-phase inverter U5, wherein the six-phase inverter U5 adopts an MC74HC04ADG chip; one end of the twenty-first resistor R21 is connected with a voltage VCC, the other end of the twenty-first resistor R21 is connected with an A4 pin of a six-phase inverter U5, and an A4 pin of the six-phase inverter U5 is connected with a square wave output by the single chip microcomputer; a VCC pin of the six-phase inverter U5 is connected with one end of a twenty-first capacitor C21 and voltage VCC, and the other end of the twenty-first capacitor C21 is grounded; the GND pin of the six-phase inverter U5 is grounded; the Y4 pin of the six-inverter U5 outputs a signal VCC1 CON; the remaining pins of the six-inverter U5 are all floating.
6. An ultrasonic echo receiving circuit according to claim 1, wherein: the single chip microcomputer adopts an ATMEGA1284P chip; pins 5, 17 and 38 of the single chip are all connected with a voltage VCC; the 4 pins of the singlechip are connected with one end of a nineteenth resistor R19 and one end of an eighteenth capacitor C18, the other end of the nineteenth resistor R19 is connected with a voltage VCC, and the other end of the eighteenth capacitor C18 is grounded; pins 6, 18, 28 and 39 of the singlechip are all grounded; one end of a nineteenth capacitor C19 at a 29 pin of the singlechip, and a 27 pin of the singlechip are connected with one end of a twentieth capacitor C20 and one end of a twentieth resistor R20; the other ends of the nineteenth capacitor C19 and the twentieth capacitor C20 are both grounded; the other end of the twentieth resistor R20 is connected with the voltage VCC; the 12 pins of the singlechip output square waves; the 30 pins of the singlechip are connected with rectification signals output by the rectification module; the rest pins of the singlechip are all suspended.
7. An ultrasonic echo receiving circuit according to claim 1, wherein: the voltage conversion module comprises an ultra-low dropout adjustable voltage regulator U2, and an ultra-low dropout adjustable voltage regulator U2 adopts an LP2980IM5-5.0 chip; the VIN pin of the ultra-low voltage difference adjustable voltage stabilizer U2 is connected with one end of a seventeenth resistor R17 and the anode of a second electrolytic capacitor CD2, and the other end of the seventeenth resistor R17 is connected with the output voltage VCC2 of the voltage stabilizing module; the negative electrode of the second electrolytic capacitor CD2 is grounded; the GND pin of the ultra-low dropout adjustable voltage regulator U2 is grounded; the ON/OFF pin of the ultra-low dropout adjustable voltage regulator U2 is connected with an output signal VCC1CON of a voltage inversion module; the VOUT pin of the ultra-low voltage difference adjustable voltage stabilizer U2 is connected with the anode of a third electrolytic capacitor CD3, and the cathode of the third electrolytic capacitor CD3 is grounded; the output voltage VCC1 of the VOUT pin of the ultra-low dropout adjustable voltage regulator U2; the rest pins of the ultra-low dropout adjustable voltage regulator U2 are grounded.
8. An ultrasonic echo receiving circuit according to claim 1, wherein: the echo amplifying module comprises a triode Q1, and the model of the triode Q1 is S9013; an emitter of the triode Q1 is connected with one end of a sixteenth resistor R16, and the other end of the sixteenth resistor R16 is grounded; the collector of the triode Q1 is connected with one end of the fifth resistor R5 and one end of the ninth resistor R9; the other end of the fifth resistor R5 is connected with one end of the first capacitor C1 and is connected with the output voltage VCC1 of the voltage conversion module; the other end of the first capacitor C1 is grounded; the base of the triode Q1 is connected with the other end of the ninth resistor R9 and one end of the twelfth resistor R12; the base electrode of the triode Q1 outputs an amplified signal; the other end of the twelfth resistor R12 is connected with one end of a thirteenth capacitor C13; the other end of the thirteenth capacitor C13 is connected to the anode of the fourth diode D4, the cathode of the third diode D3 and one end of the eleventh resistor R11; the anode of the third diode D3 and the cathode of the fourth diode D4 are both grounded; the other end of the eleventh resistor R11 is connected with one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 is connected to the echo signal of the ultrasonic probe.
9. An ultrasonic echo receiving circuit according to claim 1 or 2, wherein: the band-pass filter circuit module comprises a first operational amplifier U1B and a second operational amplifier U1A; the non-inverting input end of the first amplifier U1B is connected with the non-inverting input end of the second amplifier U1A, one end of a fourteenth capacitor C14, one end of a fourteenth resistor R14 and one end of a thirteenth resistor R13; the other end of the fourteenth capacitor C14 and the other end of the fourteenth resistor R14 are both grounded; the other end of the thirteenth resistor R13 is connected with one end of a fifteenth resistor R15, one end of a fifteenth capacitor C15, the anode of the first electrolytic capacitor CD1 and the positive power supply end of the second operational amplifier U1A; the other end of the fifteenth capacitor C15 and the negative electrode of the first electrolytic capacitor CD1 are both grounded; the other end of the fifteenth resistor R15 is connected with the output voltage VCC1 of the voltage conversion module; the inverting input of the first amplifier U1B is connected to one end of the third resistor R3 and one end of the fifth capacitor C5; the other end of the fifth capacitor C5 is connected with one end of the sixth resistor R6, one end of the first resistor R1 and one end of the second capacitor C2; the other end of the sixth resistor R6 is connected with one end of the fourth capacitor C4; the other end of the fourth capacitor C4 is connected with the amplified signal output by the echo amplification module; the other end of the first resistor R1 is grounded; the other end of the second capacitor C2 is connected to the other end of the third resistor R3, the output end of the first operational amplifier U1B, one end of the eleventh capacitor C11 and one end of the sixth capacitor C6; the other end of the eleventh capacitor C11 is grounded; the other end of the sixth capacitor C6 is connected with one end of the seventh resistor R7; the other end of the seventh resistor R7 is connected with one end of the seventh capacitor C7, one end of the second resistor R2 and one end of the third capacitor C3; the other end of the second resistor R2 is grounded; the other end of the seventh capacitor C7 is connected to the inverting input terminal of the second operational amplifier U1A and one end of the fourth resistor R4; the other end of the third capacitor C3 is connected to the other end of the fourth resistor R4, the output end of the second operational amplifier U1A and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 is grounded; the negative power supply end of the second operational amplifier U1A is grounded; the output of the second operational amplifier U1A outputs a filtered signal.
10. An ultrasonic echo receiving circuit according to claim 1 or 3, wherein: the rectifying module comprises a first diode D1 and a second diode D2; one end of the eighth capacitor C8 is connected with the filtering signal output by the band-pass filter module; the other end of the eighth capacitor C8 is connected to the anode of the first diode D1 and the cathode of the second diode D2; the anode of the second diode D2 is grounded; the cathode of the first diode D2 is connected to one end of the tenth resistor R10, one end of the tenth capacitor C10 and one end of the eighth resistor R8; the other end of the tenth resistor R10 and the other end of the tenth capacitor C10 are both grounded; the other end of the eighth resistor R8 outputs a rectified signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
| CN116846372A (en) * | 2023-07-04 | 2023-10-03 | 广州联航科电气机械有限公司 | Alternating-current charging pile control guide PWM (pulse-Width modulation) generation and detection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
| CN113777595B (en) * | 2021-09-14 | 2023-08-11 | 天津理工大学 | Ultrasonic wave receiving circuit |
| CN116846372A (en) * | 2023-07-04 | 2023-10-03 | 广州联航科电气机械有限公司 | Alternating-current charging pile control guide PWM (pulse-Width modulation) generation and detection circuit |
| CN116846372B (en) * | 2023-07-04 | 2024-06-11 | 广州联航科电气机械有限公司 | Alternating-current charging pile control guide PWM (pulse-Width modulation) generation and detection circuit |
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