CN106525318B - Bus type pressure measuring device - Google Patents
Bus type pressure measuring device Download PDFInfo
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- CN106525318B CN106525318B CN201611168218.3A CN201611168218A CN106525318B CN 106525318 B CN106525318 B CN 106525318B CN 201611168218 A CN201611168218 A CN 201611168218A CN 106525318 B CN106525318 B CN 106525318B
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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Abstract
The invention discloses a bus type pressure measuring device, which is characterized in that: the device comprises a power supply module, a pressure measurement conversion module, a control module and a bus communication module, wherein the power supply module supplies power to the device, and the pressure measurement conversion module and the bus communication module are both connected with the control module; the pressure measurement module acquires a temperature signal and outputs the pressure signal to the control module, the control module receives the pressure signal, carries out AD sampling and converts the pressure signal into a digital signal, and outputs the digital signal to the communication module; compared with the prior art, the method has the advantages of strong practicability, high accuracy and the like.
Description
Technical Field
The invention relates to the technical field of liquid pressure measurement, in particular to a bus type pressure measuring device.
Background
When liquid pressure measurement is carried out, a piezoresistive sensitive chip with small volume, high sensitivity and good stability is required to be adopted, the measurement precision of the existing pressure sensor is greatly reduced due to the sensor, the linear fitting degree is high, the pressure measurement of a small signal has no reference value, and zero drift and temperature drift are serious under the same atmospheric pressure
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a bus type pressure measuring device with strong practicability and high measuring precision.
The technical scheme adopted by the invention for solving the technical problem is as follows: a bus type pressure measuring device is characterized in that: the device comprises a power supply module, a pressure measurement conversion module, a control module and a bus communication module, wherein the power supply module supplies power to the device, and the pressure measurement conversion module and the bus communication module are both connected with the control module;
the pressure measurement module acquires a temperature signal and outputs the pressure signal to the control module, the control module receives the pressure signal, performs AD sampling and converts the pressure signal into a digital signal, and the digital signal is output to the communication module;
pressure measurement conversion module includes sensor power supply circuit, pressure sensor P15 and signal amplification circuit, sensor power supply circuit includes voltage reference circuit and voltage follower circuit, signal amplification circuit includes preceding stage difference signal amplifier circuit and back level amplifier circuit, voltage reference circuit output reference voltage, reference voltage gives pressure sensor P15 power supply through voltage follower circuit, pressure signal that pressure sensor P15 gathered passes through preceding stage difference signal amplifier circuit and back level amplifier circuit output voltage signal in proper order.
Preferably, the control module includes a single chip microcomputer U, the voltage reference circuit includes a reference voltage stabilization chip U8, outputs a 2.5V reference voltage, the voltage follower circuit includes an operational amplifier U1A, the output voltage supplies power to the pressure sensor P15, the pressure sensor P15 is a diffused silicon sensor, the preceding stage differential signal amplification circuit includes operational amplifiers U1C and U1D, the operational amplifiers U1C and U1D receive the differential signal of the pressure sensor and amplify and output the differential signal to the subsequent stage amplification circuit, the subsequent stage amplification circuit includes an operational amplifier U1B, the operational amplifier U1B receives the output signals of the operational amplifiers U1C and U1D, performs subsequent stage amplification, and outputs the voltage signal to an ADC acquisition end of the single chip microcomputer U.
Preferably, the power supply module comprises a self-recovery fuse F1, one end of the self-recovery fuse F1 is connected with a 24V power supply, the other end of the self-recovery fuse F1 is connected with the anode of a diode D1, and the cathode of the diode D1 is respectively connected with one ends of capacitors C7 and C8 and a resistor R2 and a 7-pin of a power management chip U1. The other end of the resistor R2 is connected with a pin 5 of the power management chip U1 and one end of the resistor R7-1 respectively, pins 6 and 9 of the power management chip U1 are grounded, and the other ends of the capacitors C7 and C8 and the resistor R7-1 are grounded. A pin 1 of a power management chip U1 is connected with one end of a capacitor C1-1, the other end of the capacitor C1-1 is respectively connected with one end of an inductor L1 and the cathode of a Schottky diode D2, the anode of the Schottky diode D2 is grounded, an 8 pin of the power management chip U1 is connected with the cathode of the Schottky diode D2, a pin 4 of the power management chip U1 is respectively connected with one ends of a resistor R3-1 and a resistor R10, the other end of the resistor R3-1 is respectively connected with the other end of the inductor L1 and one ends of capacitors C6, C4-1 and C5, the other end of the resistor R10 and the other ends of the capacitors C6, C4-1 and C5 are grounded, and one end of the capacitor C5 outputs 3V voltage.
Preferably, the voltage reference circuit comprises a reference voltage stabilization chip U8 and filter capacitors C22-C24, wherein a pin 1 of the reference voltage stabilization chip U8 is connected with a voltage of 3.3V and one end of a capacitor C22 respectively, the other end of the capacitor C22 is grounded, a pin 3 of the reference voltage stabilization chip U8 is connected with one ends of capacitors C23 and C24 and ground respectively, and a pin 2 is connected with the other ends of capacitors C23 and C24 respectively and outputs a reference voltage;
the voltage following circuit comprises an operational amplifier U1A, filter capacitors C15, C16, resistors R23 and R24, wherein the non-inverting input end of the operational amplifier U1A is connected with a reference voltage through the resistor R24, the inverting input end of the operational amplifier U1A is respectively connected with one ends of the capacitor C15 and the resistor R23, the other ends of the capacitor C15 and the resistor R23 are connected with the output end of the operational amplifier U1A, the 11 pin of the operational amplifier U1A is grounded, the 4 pin of the operational amplifier U1A is respectively connected with a 3.3V voltage and one end of the capacitor C16, and the other end of the capacitor C16 is grounded.
Preferably, the preceding stage differential signal amplifying circuit includes operational amplifiers U1C, U1D and a filter circuit, the filter circuit includes resistors R18 and R22 and capacitors C2, C13 and C14, one end of the capacitor C2 is connected to pin 1 of the scr sensor P15 and one end of the resistor R18, the other end of the capacitor C2 is connected to pin 3 of the scr sensor P15 and one end of the resistor R22, the other end of the resistor R18 is connected to one end of the capacitor C13 and a positive input end of the operational amplifier U1C, the other end of the resistor R22 is connected to a non-inverting input end of the operational amplifier U1D and one end of the capacitor C14, the other end of the capacitor C14 is grounded, an inverting input of the operational amplifier U1A is connected to one ends of the resistors R6, R7, R7.0 and the capacitor C9, an output end of the resistor R6 and the other end of the capacitor C9, and one end of the inverting input end of the operational amplifier U1D is connected to an inverting input end of the resistor R9, and an inverting input end of the operational amplifier U8 is connected to an inverting input end of the resistor R8, The sliding end and the fixed end of the potentiometer W9, the other fixed end of the potentiometer W9 is connected with the other ends of the resistors R7 and R7.0 respectively, and the output end of the operational amplifier U1D is connected with the other end of the resistor R8 and one end of the resistor R10 respectively;
the post-stage amplification circuit comprises an operational amplifier U1B, wherein the inverting input end of the amplifier U1B is respectively connected with the other end of a resistor R9 and one ends of resistors R13 and R11, the other end of a resistor R13 is connected with 0.6V bias voltage, the non-inverting input end of the operational amplifier U1B is respectively connected with one ends of resistors R12 and R14 and the other end of a resistor R10, the other end of the resistor R12 is grounded, the other end of a resistor R4 is connected with the sliding end of a potentiometer W2, one fixed end of the potentiometer W2 is grounded, the other fixed end of the potentiometer W2 is connected with 1.2V bias voltage, the output end of the operational amplifier U1B is connected with one end of a temperature sensor Rr, the other end of the temperature sensor Rr is respectively connected with the other end of the resistor R11 and one end of the resistor R120, the other end of the resistor R120 is grounded, and the output end of the operational amplifier U1D outputs voltage signals;
the pressure measurement conversion module further comprises a signal output circuit, the signal output circuit comprises a resistor R20, one end of the resistor R20 is connected with the output end of the operational amplifier U1B, the other end of the resistor R20 is connected with one end of the capacitor C26 and the cathode of the voltage stabilizing diode D3 respectively, the other end of the capacitor C26 and the anode of the voltage stabilizing diode D3 are both grounded, and the cathode of the voltage stabilizing diode D3 outputs signals to the ADC acquisition end of the single chip microcomputer U.
Preferably, the model of the single chip microcomputer U is STM32F101R8T6, the control module further includes a filter circuit and a crystal oscillator circuit, the crystal oscillator circuit includes a crystal oscillator Y1, one end of the crystal oscillator Y1 is connected to the 5 pin of the single chip microcomputer U and one end of the resistor R8 and the capacitor C7 respectively, the other end of the crystal oscillator Y1 is connected to the 6 pin of the single chip microcomputer U and one end of the resistor R8 and the capacitor C8 respectively, and the other ends of the capacitors C7 and C8 are both grounded; the filter circuit comprises filter capacitors C21-C23, C25-C30 and C66-C69, the capacitors C21-C23, C25-C30 and C66-C69 are connected between 3.3V voltage and the ground in parallel, and pins 1, 32, 48, 64, 19 and 13 of the single chip microcomputer U are all connected with 3.3V voltage;
the 7 pins of the single chip microcomputer U are respectively connected with one ends of a resistor R14 and a capacitor C24, the other end of the resistor R14 is connected with a 3.3V power supply, the other end of the capacitor C24 is grounded, the 60 pin of the single chip microcomputer U is grounded through a resistor R10, the 28 pin is grounded through a resistor R5, and the 31, 47, 63, 18 and 12 pins are grounded;
the control module further comprises bus interfaces P7 and P10, pins 2 and 4 of the bus interface P7 are respectively connected with pins 46 and 49 of the single chip microcomputer U, pin 1 of P7 is grounded, pin 3 is respectively connected with 3.3V voltage and one ends of capacitors C4-C6, the other ends of the capacitors C4-C6 are grounded, pin 2 of the bus interface P10 is grounded, pin 1 is respectively connected with one end of a resistor R119 and pin 45 of the single chip microcomputer U, and the other end of the resistor R119 is connected with 3.3V voltage.
Preferably, the bus communication module comprises a schmitt trigger U10 and a transceiver U9, the schmitt trigger U10 is SN74LVC2G14, the transceiver U9 is SP3485, pins 1 and 3 of the schmitt trigger U10 are respectively connected to pins 52 and 51 of the single chip microcomputer U, pin 2 is grounded, pin 5 is connected to 3.3V voltage, pin 4 is respectively connected to pins 2 and 3 of the transceiver U9, pin 1 and pin 4 of the transceiver U9 are respectively connected to pins 52 and 51 of the single chip microcomputer U, pin 5 is grounded, pin 8 is respectively connected to 3.3V voltage and one end of a capacitor C21, the other end of the capacitor C21 is grounded, pin 7 is respectively connected to resistors R5 and R1 and one end of TVSD3 and D7, pin 6 is respectively connected to resistor R32, TVS tube D4, one end of a single-pole single-throw switch U2, and the other end of TVS tube R8653 and the other end of the single-pole switch 86868686867 and the other end of the single-pole switch 8686 4, the other end of the resistor R32 is connected with 3.3V voltage, and the 6 and 7 pins of the transceiver U9 respectively output signals to communicate with an upper computer.
Preferably, the display module further comprises a four-digit digital display tube U5, the model of the four-digit digital display tube U5 is DPY-4CA, and the four-digit digital tube is driven by a serial-parallel conversion chip U6 and is 74HC 595.
The invention has the beneficial effects that: the power module circuit is connected with the self-recovery fuse and the diode in series, so that the excessive power current is prevented, and the damage of an internal circuit caused by reversely connecting a power supply is prevented; the output gain of a preceding stage differential signal amplifying circuit in the pressure measurement conversion module is adjustable, so that the linear fitting degree is improved; the temperature sensor Rr is added for compensating positive and negative temperature drift, the measurement precision is improved, the bias voltage is added to the input end of the rear-stage amplifying circuit for zero setting, repeated table switching of the pressure sensor P15 is reduced, and the practicability is high.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram of the power module of the present invention;
FIG. 3A is a circuit diagram of a voltage follower circuit of the present invention;
FIG. 3B is a circuit diagram of the voltage follower circuit of the present invention;
FIG. 4 is a schematic diagram of a thyristor sensor according to the present invention;
FIG. 5 is a circuit diagram of a signal amplification circuit according to the present invention;
FIG. 6 is a schematic diagram of a single-chip microcomputer U according to the present invention;
FIG. 7A is a schematic diagram of a bus interface P7 according to the present invention;
FIG. 7B is a schematic diagram of a bus interface P10 according to the present invention;
FIG. 8 is a schematic diagram of the communication circuit of the present invention;
FIG. 9 is a schematic diagram of a Schmitt trigger pin according to the present invention;
FIG. 10 is a schematic structural diagram of another embodiment of the present invention;
FIG. 11 is a schematic diagram of a display circuit according to the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1-4, the bus type pressure measurement device of the present invention includes a power module, a pressure measurement conversion module, a control module and a bus communication module, wherein the power module supplies power to the device, and the pressure measurement conversion module and the bus communication module are both connected to the control module; the pressure measurement module acquires a temperature signal and outputs the pressure signal to the control module, the control module receives the pressure signal, carries out AD sampling and converts the pressure signal into a digital signal, and outputs the digital signal to the communication module;
pressure measurement conversion module includes sensor power supply circuit, pressure sensor P15 and signal amplification circuit, sensor power supply circuit includes voltage reference circuit and voltage follower circuit, signal amplification circuit includes preceding stage difference signal amplifier circuit and back level amplifier circuit, voltage reference circuit output reference voltage, reference voltage gives pressure sensor P15 power supply through voltage follower circuit, pressure signal that pressure sensor P15 gathered passes through preceding stage difference signal amplifier circuit and back level amplifier circuit output voltage signal in proper order.
As shown in fig. 2, the power module includes a self-recovery fuse F1, one end of the self-recovery fuse F1 is connected to a 24V power supply, the other end is connected to the anode of a diode D1, and the cathode of the diode D1 is connected to one end of capacitors C7 and C8 and a resistor R2, and to the 7-pin of the power management chip U1, respectively. The other end of the resistor R2 is respectively connected with a pin 5 of the power management chip U1 and one end of the resistor R7-1, pins 6 and 9 of the power management chip U1 are grounded, and the other ends of the capacitors C7 and C8 and the resistor R7-1 are grounded. A pin 1 of a power management chip U1 is connected with one end of a capacitor C1-1, the other end of the capacitor C1-1 is respectively connected with one end of an inductor L1 and the cathode of a Schottky diode D2, the anode of the Schottky diode D2 is grounded, an 8 pin of the power management chip U1 is connected with the cathode of the Schottky diode D2, a pin 4 of the power management chip U1 is respectively connected with one ends of a resistor R3-1 and a resistor R10, the other end of the resistor R3-1 is respectively connected with the other end of the inductor L1 and one ends of capacitors C6, C4-1 and C5, the other end of the resistor R10 and the other ends of the capacitors C6, C4-1 and C5 are grounded, and one end of the capacitor C5 outputs 3V voltage.
Preferably, the self-recovery fuse F1 is R60-090, the diode D1 is IN4007, the schottky diode D2 is B340A, the inductor L1 is 15 μ H, the capacitors C1-1 and C4-1, the capacitances of C5 to C8 are 10nF, 1nF, 100 μ F/16V, 100nF, and 100 μ F/50V, and the resistances of the resistors R2, R3-1, R7-1, and R10 are 100K Ω, 10K Ω, 100K Ω, and 5.9K Ω, respectively.
The power management chip is TPS5430, is a high-output current PWM converter and integrates a low-impedance high-side N-channel MOS tube. A high-performance voltage error amplifier is integrated inside, has strict voltage regulation precision under the transient condition, and has the function of undervoltage locking so as to prevent the input voltage from starting when reaching 5.5V; the built-in slow start circuit limits surge current, and the voltage feedforward circuit improves transient response. Other functions include a sensitive high-level enable, over-current protection, and thermal shutdown. To reduce design complexity and external component count, the TPS5430 has an internal feedback compensation loop with limited built-in ESD protection. Wide voltage input is 0-24v, and the maximum current can reach 3A.
Preferably, a self-recovery fuse and a diode are connected in series in the circuit to prevent the power supply current from being overlarge and prevent the internal circuit from being damaged due to the reverse connection of the power supply.
As shown in fig. 3A and 3B, the voltage reference circuit includes a reference voltage stabilization chip U8 and filter capacitors C22 to C24, where pin 1 of the reference voltage stabilization chip U8 is connected to the voltage of 3.3V and one end of a capacitor C22, the other end of the capacitor C22 is grounded, pin 3 of the reference voltage stabilization chip U8 is connected to one end of capacitors C23 and C24 and ground, pin 2 is connected to the other ends of capacitors C23 and C24, respectively, and outputs a reference voltage;
the voltage follower circuit comprises an operational amplifier U1A, filter capacitors C15, C16, resistors R23 and R24, wherein the non-inverting input end of the operational amplifier U1A is connected with reference voltage through the resistor R24, the inverting input end of the operational amplifier U1A is connected with one ends of the capacitor C15 and the resistor R23 respectively, the other ends of the capacitor C15 and the resistor R23 are connected with the output end of the operational amplifier U1A, the 11 pins of the operational amplifier U1A are grounded, the 4 pins of the operational amplifier U1A are connected with 3.3V voltage and one end of the capacitor C16 respectively, and the other end of the capacitor C16 is grounded.
Preferably, the reference voltage stabilization chip U8 is an ADR381, and the operational amplifier U1A is a TLV 2374. The reference voltage stabilization chip U8 of the diffused silicon power supply adopts ADR381 to output stable 2.5v voltage, the loading capacity of the power supply is improved through the voltage follower circuit, the diffused silicon power supply is used by a diffused silicon sensor, and the measurement precision deviation caused by the voltage fluctuation of a main power supply is greatly reduced.
Preferably, the resistance values of the resistors R23 and R24 are both 1K omega, the capacitance values of the capacitors C15, C16, C22 and C23 are all 100nF, and the specification of the electrolytic capacitor C24 is 10 muF/16V.
As shown in fig. 4, the pressure sensor P15 is a diffused silicon sensor, in which 4 pins of the diffused silicon sensor are connected to the output terminal of the operational amplifier U1A, 2 pins are connected to ground, and 1 pin and 3 pin output corresponding voltage signals S +, S +.
The diffused silicon sensor has the advantages of high sensitivity, high precision, large linear range, stronger overpressure capacity and better impact resistance. The pressure is directly acted on the sensor film to generate micro displacement proportional to the pressure of the medium, the resistance value of the sensor is used to change, and the change is detected by the electronic circuit to output a corresponding proportional micro-voltage signal.
As shown in fig. 5, the pre-stage differential signal amplifying circuit includes operational amplifiers U1C and U1D, and a filter circuit including resistors R18 and R22 and capacitors C2, C13 and C14, wherein one end of the capacitor C2 is connected to the pin 1 of the pressure sensor P15 and one end of the resistor R18, the other end of the capacitor C2 is connected to the pin 3 of the pressure sensor P15 and one end of the resistor R22, the other end of the resistor R18 is connected to one end of the capacitor C13 and one end of the operational amplifier U1C, the other end of the resistor R22 is connected to the non-inverting input end of the operational amplifier U1D and one end of the capacitor C14, the other end of the capacitor C14 is grounded, the inverting input of the operational amplifier U1A is connected to one end of the resistors R6, R7, R7.0 and one end of the capacitor C9, the output end of the resistor R6, the other end of the capacitor C9 and one end of the resistor R9, and one end of the inverting input end of the operational amplifier U1D are connected to the inverting input end of the operational amplifier U8 and the inverting input end of the resistor D, respectively, The sliding end and the fixed end of the potentiometer W9, the other fixed end of the potentiometer W9 is respectively connected with the other ends of the resistors R7 and R7.0, and the output end of the operational amplifier U1D is respectively connected with the other end of the resistor R8 and one end of the resistor R10; the post-stage amplification circuit comprises an operational amplifier U1B, wherein the inverting input end of the amplifier U1B is respectively connected with the other end of a resistor R9 and one ends of resistors R13 and R11, the other end of a resistor R13 is connected with 0.6V bias voltage, the non-inverting input end of the operational amplifier U1B is respectively connected with one ends of resistors R12 and R14 and the other end of a resistor R10, the other end of the resistor R12 is grounded, the other end of a resistor R4 is connected with the sliding end of a potentiometer W2, one fixed end of the potentiometer W2 is grounded, the other fixed end of the potentiometer W2 is connected with 1.2V bias voltage, the output end of the operational amplifier U1B is connected with one end of a temperature sensor Rr, the other end of the temperature sensor Rr is respectively connected with the other end of the resistor R11 and one end of the resistor R120, the other end of the resistor R120 is grounded, and the output end of the operational amplifier U1D outputs voltage signals.
Preferably, the operational amplifiers U1B, U1C and U1D are all TLVs 2374.
The pressure sensor P15 outputs a differential signal which is filtered by R18, C13, R22 and C14 to obtain a stable signal, and the stable signal is amplified by pre-operational amplifiers U1C and U1D to output a gain-adjustable amplified signal, wherein W9 is an adjustable potentiometer. The output signals of U1C and U1D are voltage difference signals, and need to be converted into output signals to ground, and an amplifying circuit which adopts U1B to form a differential input and adopts a single-ended output, and only amplifies differential voltage, therefore, the requirements of R9: r11 ═ R10: and R12.
The rear-stage operational amplifier U1B is a single-ended output, the output voltage is 0-2v, the input of the operational amplifier U1B is 0-0.2v, therefore, the gain of the operational amplifier U1B is 10, and R9: r10 ═ R11: r12 ═ 1: 10. The output is connected with a load of 10 k.
When the pressure is 0, the output of the sensor is 0, the output of the post-stage amplifying circuit is zero to the ground voltage, and the actual output is not 0, so that the bias voltage is applied to the post-stage input end for zero adjustment, and repeated calibration of the sensor is reduced.
Rr in the circuit is a KTY series sensor, is suitable for the compensation of positive and negative temperature drift, carries out automatic temperature compensation, solves the problem of temperature drift.
Preferably, the resistances of the resistors R4, R6-R13, R18, R22 and R120 are 100K Ω, 1K Ω, 100K Ω, 30K Ω, 300K Ω, 200K Ω, 100 Ω and 10K Ω, respectively, and the capacitances of the capacitors C2, C9, C13 and C14 are 100nF, 1nF, 10nF and 10nF, respectively.
The signal output circuit comprises a resistor R20, one end of the resistor R20 is connected with the output end of the operational amplifier U1B, the other end of the resistor R20 is connected with one end of a capacitor C26 and the cathode of a voltage stabilizing diode D3 respectively, the other end of the capacitor C26 and the anode of the voltage stabilizing diode D3 are grounded, and the cathode of the voltage stabilizing diode D3 outputs signals to the ADC acquisition end of the single chip microcomputer U.
Preferably, the resistance value of the resistor R20 is 1K Ω, the capacitance value of the capacitor C26 is 2.2nF, and the zener diode D3 is a 3.3V zener diode.
As shown in fig. 6, the model of the single chip microcomputer is STM32F101R8T6, the control module further includes a filter circuit and a crystal oscillator circuit, the crystal oscillator circuit includes a crystal oscillator Y1, one end of the crystal oscillator Y1 is connected to the 5 pin of the single chip microcomputer U and one end of the resistor R8 and the capacitor C7 respectively, the other end of the crystal oscillator Y1 is connected to the 6 pin of the single chip microcomputer U and one end of the resistor R8 and the capacitor C8 respectively, and the other ends of the capacitors C7 and C8 are both grounded; the filter circuit comprises filter capacitors C21-C23, C25-C30 and C66-C69, the capacitors C21-C23, C25-C30 and C66-C69 are connected between 3.3V voltage and the ground in parallel, and pins 1, 32, 48, 64, 19 and 13 of the single chip microcomputer U are all connected with 3.3V voltage;
the 7 pins of the single chip microcomputer U are respectively connected with one ends of a resistor R14 and a capacitor C24, the other end of the resistor R14 is connected with a 3.3V power supply, the other end of the capacitor C24 is grounded, the 60 pin of the single chip microcomputer U is grounded through a resistor R10, the 28 pin is grounded through a resistor R5, and the 31, 47, 63, 18 and 12 pins are grounded;
preferably, the crystal oscillator Y1 is 8MHz, the capacitors C7, C8, C21 to 30 and C66 to C69 have values of 20pF, 100nF, 10 μ F and 10 μ F, and the resistors R8, R10, R14, R5 and R119 have values of 1M Ω, 10K Ω and 10K Ω, respectively.
As shown in fig. 7A and 7B, the control module further includes bus interfaces P7 and P10, pins 2 and 4 of the bus interface P7 are respectively connected to pins 46 and 49 of the single chip microcomputer U, pin 1 of P7 is grounded, pin 3 is respectively connected to 3.3V voltage and one ends of capacitors C4 to C6, the other ends of the capacitors C4 to C6 are grounded, pin 2 of the bus interface P10 is grounded, pin 1 is respectively connected to one end of a resistor R119 and a pin 45 of the single chip microcomputer U, and the other end of the resistor R119 is connected to 3.3V voltage.
Preferably, the capacitance values of the capacitors C4-C6 are 47 muF, 10 muF and 10 muF respectively.
As shown in fig. 8 and 9, the bus communication module includes a schmitt trigger U10 and a transceiver U9, the schmitt trigger U10 is SN74LVC2G14, the transceiver U9 is SP3485, pins 1 and 3 of the schmitt trigger U10 are respectively connected to pins 52 and 51 of the single chip microcomputer U, pin 2 is grounded, pin 5 is connected to 3.3V, pin 4 is connected to pins 2 and 3 of the transceiver U9, pin 1 and pin 4 of the transceiver U9 are respectively connected to pins 52 and 51 of the single chip microcomputer U, pin 5 is grounded of the transceiver U9, pin 8 is connected to 3.3V and one end of a capacitor C21, the other end of the capacitor C21 is grounded, pin 7 is connected to a resistor R31, R1 and one end of TVSD3 and D7, pin 6 is connected to a resistor R32, a TVS tube D4, one end of the single-pole single-throw switch U2 and the other end of the TVS tube TVS 9, and the other end of the single-throw switch R4, and the single-throw switch of the single-pole switch U7 are connected to the single-throw switch R4, and the single-pole of the single-throw switch U9, The other end of the D3 is grounded, the other end of the resistor R32 is connected with 3.3V voltage, and the 6 pin and the 7 pin of the transceiver U9 respectively output signals to communicate with the upper computer.
Preferably, the TVS tubes D3, D4 and D7 are SMBJ15CA, the capacitor C21 is 100nF, and the resistors R1, R31 and R32 are 120 Ω, 4.7K Ω and 4.7K Ω.
As shown in fig. 10 and 11, the apparatus according to another embodiment of the present invention further includes a display module, connected to the control module, for displaying the pressure value; the display module comprises a four-digit nixie tube U5 with the model of DPY-4CA, the four-digit nixie tube is driven by a serial-parallel conversion chip U6 with the model of 74HC 595.
Preferably, the resistors RP1 and RP2 are both 330 Ω, the resistors R12, R13, R14 and R85 are all 1K Ω, and the transistors Q1, Q6, Q4 and Q3 are all NPN-type transistors.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A bus type pressure measuring device is characterized in that: the device comprises a power supply module, a pressure measurement conversion module, a control module and a bus communication module, wherein the power supply module supplies power to the device, and the pressure measurement conversion module and the bus communication module are both connected with the control module;
the pressure measurement conversion module acquires a pressure signal and outputs the pressure signal to the control module, the control module receives the pressure signal, performs AD sampling and converts the pressure signal into a digital signal, and outputs the digital signal to the communication module;
the pressure measurement conversion module comprises a sensor power circuit, a pressure sensor P15 and a signal amplification circuit, the sensor power circuit comprises a voltage reference circuit and a voltage following circuit, the signal amplification circuit comprises a preceding stage differential signal amplification circuit and a subsequent stage amplification circuit, the voltage reference circuit outputs reference voltage, the reference voltage supplies power to the pressure sensor P15 through the voltage following circuit, and a pressure signal acquired by the pressure sensor P15 sequentially passes through the preceding stage differential signal amplification circuit and the subsequent stage amplification circuit to output a voltage signal;
the control module comprises a single chip microcomputer U, the voltage reference circuit comprises a reference voltage stabilization chip U8 and outputs 2.5V reference voltage, the voltage following circuit comprises an operational amplifier U1A, the output voltage supplies power to the pressure sensor P15, the pressure sensor P15 is a diffused silicon sensor, the front-stage differential signal amplification circuit comprises an operational amplifier U1C and an operational amplifier U1D, the operational amplifier U1C and the operational amplifier U1D receive differential signals of the pressure sensor and amplify and output the differential signals to a rear-stage amplification circuit, the rear-stage amplification circuit comprises an operational amplifier U1B, the operational amplifier U1B receives output signals of the operational amplifiers U1C and U1D and performs rear-stage amplification, and outputs voltage signals to an ADC acquisition end of the single chip microcomputer U;
the pre-stage differential signal amplifying circuit comprises operational amplifiers U1C and U1D and a filter circuit, the filter circuit comprises resistors R18 and R22, capacitors C2 and C13, and C14, one end of the capacitor C2 is respectively connected with a pin 1 of the thyristor sensor P15 and one end of the resistor R18, the other end of the capacitor C2 is respectively connected with a pin 3 of the thyristor sensor P15 and one end of the resistor R22, the other end of the resistor R22 is respectively connected with one end of the capacitor C22 and a positive input end of the operational amplifier U1 22, the other end of the resistor R22 is respectively connected with a non-inverting input end of the operational amplifier U1 22 and one end of the capacitor C22, the other end of the capacitor C22 is grounded, an inverting input end of the operational amplifier U1 22 is respectively connected with one end of the resistors R22, R6857.0 and one end of the capacitor C22, output ends of the inverting inputs of the resistors R22 and the resistor 22 are respectively connected with the other end of the resistor R22, and one end of the inverting input end of the operational amplifier U22, and the inverting input end of the operational amplifier U22 are respectively connected with the inverting input end of the resistor 22, The sliding end and the fixed end of the potentiometer W9, the other fixed end of the potentiometer W9 is connected with the other ends of the resistors R7 and R7.0 respectively, and the output end of the operational amplifier U1D is connected with the other end of the resistor R8 and one end of the resistor R10 respectively;
the post-stage amplification circuit comprises an operational amplifier U1B, wherein the inverting input end of the amplifier U1B is respectively connected with the other end of a resistor R9 and one ends of resistors R13 and R11, the other end of a resistor R13 is connected with 0.6V bias voltage, the non-inverting input end of the operational amplifier U1B is respectively connected with one ends of resistors R12 and R14 and the other end of a resistor R10, the other end of the resistor R12 is grounded, the other end of a resistor R4 is connected with the sliding end of a potentiometer W2, one fixed end of the potentiometer W2 is grounded, the other fixed end of the potentiometer W2 is connected with 1.2V bias voltage, the output end of the operational amplifier U1B is connected with one end of a temperature sensor Rr, the other end of the temperature sensor Rr is respectively connected with the other end of the resistor R11 and one end of the resistor R120, the other end of the resistor R120 is grounded, and the output end of the operational amplifier U1D outputs voltage signals;
the pressure measurement conversion module further comprises a signal output circuit, the signal output circuit comprises a resistor R20, one end of the resistor R20 is connected with the output end of the operational amplifier U1B, the other end of the resistor R20 is connected with one end of the capacitor C26 and the cathode of the voltage stabilizing diode D3 respectively, the other end of the capacitor C26 and the anode of the voltage stabilizing diode D3 are both grounded, and the cathode of the voltage stabilizing diode D3 outputs signals to the ADC acquisition end of the single chip microcomputer U.
2. A bus-type pressure measuring device according to claim 1, wherein: the power supply module comprises a self-recovery fuse F1, one end of a self-recovery fuse F1 is connected with a 24V power supply, the other end of the self-recovery fuse F1 is connected with the anode of a diode D1, the cathode of the diode D1 is respectively connected with one end of capacitors C7, C8, resistor R2 and the 7 pin of a power management chip U1, the other end of the resistor R2 is respectively connected with the 5 pin of the power management chip U1 and one end of a resistor R7-1, the 6 and 9 pins of the power management chip U1 are grounded, the other ends of the capacitors C7, C8 and the resistor R7-1 are grounded, the 1 pin of the power management chip U1 is connected with one end of a capacitor C1-1, the other end of the capacitor C1-1 is respectively connected with one end of an inductor L1 and the cathode of a Schottky diode D2, the anode of a Schottky diode D2 is grounded, the 8 pin of a power management chip U1 is connected with the cathode of a Schottky diode D2, the 4 pin of the power management chip U1 is respectively connected with one end of a resistor R10 and the resistor R3, the other end of the resistor R3-1 is connected with the other end of the inductor L1 and one end of each of the capacitors C6, C4-1 and C5 respectively, the other end of the resistor R10 and the other end of each of the capacitors C6, C4-1 and C5 are grounded, and one end of the capacitor C5 outputs 3.3V voltage.
3. A bus-type pressure measuring device according to claim 1, wherein: the voltage reference circuit comprises a reference voltage stabilizing chip U8 and filter capacitors C22-C24, wherein a 1 pin of the reference voltage stabilizing chip U8 is respectively connected with a 3.3V voltage and one end of a capacitor C22, the other end of the capacitor C22 is grounded, a 3 pin of the reference voltage stabilizing chip U8 is respectively connected with one ends of the capacitors C23 and C24 and the ground, and a 2 pin of the reference voltage stabilizing chip U8 is respectively connected with the other ends of the capacitors C23 and C24 and outputs reference voltage;
the voltage following circuit comprises an operational amplifier U1A, filter capacitors C15, C16, resistors R23 and R24, wherein the non-inverting input end of the operational amplifier U1A is connected with a reference voltage through the resistor R24, the inverting input end of the operational amplifier U1A is respectively connected with one ends of the capacitor C15 and the resistor R23, the other ends of the capacitor C15 and the resistor R23 are connected with the output end of the operational amplifier U1A, the 11 pin of the operational amplifier U1A is grounded, the 4 pin of the operational amplifier U1A is respectively connected with a 3.3V voltage and one end of the capacitor C16, and the other end of the capacitor C16 is grounded.
4. A bus-type pressure measuring device according to claim 1, wherein: the model of the single chip microcomputer U is STM32F101R8T6, the control module further comprises a filter circuit and a crystal oscillator circuit, the crystal oscillator circuit comprises a crystal oscillator Y1, one end of the crystal oscillator Y1 is respectively connected with a 5 pin of the single chip microcomputer U, one end of a resistor R8 and one end of a capacitor C7, the other end of the crystal oscillator Y1 is respectively connected with a 6 pin of the single chip microcomputer U, one end of the resistor R8 and one end of the capacitor C8, and the other ends of the capacitors C7 and C8 are both grounded; the filter circuit comprises filter capacitors C21-C23, C25-C30 and C66-C69, the capacitors C21-C23, C25-C30 and C66-C69 are connected between 3.3V voltage and the ground in parallel, and pins 1, 32, 48, 64, 19 and 13 of the single chip microcomputer U are all connected with 3.3V voltage;
the 7 pins of the single chip microcomputer U are respectively connected with one ends of a resistor R14 and a capacitor C24, the other end of the resistor R14 is connected with a 3.3V power supply, the other end of the capacitor C24 is grounded, the 60 pin of the single chip microcomputer U is grounded through a resistor R10, the 28 pin is grounded through a resistor R5, and the 31, 47, 63, 18 and 12 pins are grounded;
the control module further comprises bus interfaces P7 and P10, pins 2 and 4 of the bus interface P7 are respectively connected with pins 46 and 49 of the single chip microcomputer U, pin 1 of P7 is grounded, pin 3 is respectively connected with 3.3V voltage and one ends of capacitors C4-C6, the other ends of the capacitors C4-C6 are grounded, pin 2 of the bus interface P10 is grounded, pin 1 is respectively connected with one end of a resistor R119 and a pin 45 of the single chip microcomputer U, and the other end of the resistor R119 is connected with 3.3V voltage.
5. A bus-type pressure measuring device according to claim 1, wherein: the bus communication module comprises a Schmitt trigger U10 and a transceiver U9, the Schmitt trigger U10 is SN74LVC2G14, the transceiver U9 is SP3485, pins 1 and 3 of the Schmitt trigger U10 are respectively connected with pins 52 and 51 of the single chip microcomputer U, pin 2 is grounded, pin 5 is connected with 3.3V voltage, pin 4 is respectively connected with pin 2 and pin 3 of the transceiver U9, pin 1 and pin 4 of the transceiver U9 are respectively connected with pin 52 and pin 51 of the single chip microcomputer U, pin 5 and pin 8 of the transceiver U9 are respectively connected with 3.3V voltage and one end of a capacitor C21, the other end of the capacitor C21 is grounded, pin 7 is respectively connected with resistors R31 and R1 and one end of TVSD3 and D7, pin 6 is respectively connected with resistor R32, TVS tube D4, one end of a single-pole single-throw switch U2 and the other end of TVS tube D7, and the other end of TVR 867 and TVS 867 are respectively connected with a single-pole switch 8686867 and a single-pole switch 86867, the other end of the resistor R32 is connected with 3.3V voltage, and the pins 6 and 7 of the transceiver U9 respectively output signals to communicate with an upper computer.
6. A bus-type pressure measuring device according to claim 1, wherein: the display device further comprises a display module, wherein the display module comprises a four-digit digital display tube U5, the model of the four-digit digital display tube U5 is DPY-4CA, the four-digit digital display tube is driven by a serial-parallel conversion chip U6, and the model of the four-digit digital display tube is 74HC 595.
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| CN108088862B (en) * | 2018-02-09 | 2023-05-23 | 丹东市祯晟科技有限公司 | Wireless integrated X-ray flaw detector control system |
| CN109357793B (en) * | 2018-11-29 | 2023-10-20 | 重庆智慧水务有限公司 | Pressure measurement system and method based on voltage type pressure sensor |
| CN112179528A (en) * | 2020-08-21 | 2021-01-05 | 武汉中航传感技术有限责任公司 | CMOS integrated circuit and pressure sensor |
| CN114295280B (en) * | 2022-03-09 | 2022-06-07 | 成都凯天电子股份有限公司 | Pressure signal scanning measurement system |
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