CN216621600U - High-precision pressure sensor calibration circuit - Google Patents
High-precision pressure sensor calibration circuit Download PDFInfo
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- CN216621600U CN216621600U CN202123395254.2U CN202123395254U CN216621600U CN 216621600 U CN216621600 U CN 216621600U CN 202123395254 U CN202123395254 U CN 202123395254U CN 216621600 U CN216621600 U CN 216621600U
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Abstract
The utility model discloses a high-precision pressure sensor calibration circuit which comprises a control unit, an interface unit, a first relay unit, a second relay unit and a power supply unit, wherein the control unit comprises a control chip U4, the control chip U4 is connected with an upper computer through the interface unit, a control end of the first relay unit and a control end of the second relay unit are both connected with a control chip U4, a common end of the first relay unit and a common end of the second relay unit are both connected with a sensor interface J5, a normally closed end of the first relay unit is connected with a calibration plate interface J1, and a normally closed end of the second relay unit is connected with a collector interface J4; the power supply unit supplies power to other units. The control unit controls the connection and disconnection between the pressure sensor and the pressure calibration plate and between the pressure sensor and the collector through the two relay units, and the whole calibration operation can be completed through one-time connection. The scheme is suitable for production and testing of the pressure sensor.
Description
Technical Field
The utility model relates to the field of sensor production and test, in particular to a high-precision pressure sensor calibration circuit.
Background
The existing calibration modes of the ceramic resistor pressure sensor are more manual calibration, the manual calibration needs to be implemented by manually connecting the pressure sensor with a pressure chip calibration plate, reading each pressure calibration ADC value of the chip, calculating a calibration coefficient, selecting the coefficient in calibration software, writing calibration parameters, disconnecting the pressure sensor from the pressure calibration plate, connecting the pressure sensor with an external multimeter, testing the output under each pressure, connecting the pressure sensor wiring back to the calibration plate, inputting the tested data as a compensation value into the software for calibration compensation, finally connecting the pressure sensor with the multimeter again, and testing and confirming the calibrated result. The calibration flow mode has the advantages of too frequent equipment switching, complex calibration flow, easy error of manual operation, multiple steps of data needing manual input in calibration, easy error input, missing input problem, long time consumption and incapability of meeting the requirement of large-batch production calibration operation.
Disclosure of Invention
The utility model mainly solves the technical problems of multiple connection and disconnection operations, manual data input, easy error and leakage and the like in the prior art, and provides the high-precision pressure sensor calibration circuit which can automatically complete data acquisition, calibration and other operations only by single connection.
The utility model mainly solves the technical problems through the following technical scheme: a high-precision pressure sensor calibration circuit comprises a control unit, an interface unit, a first relay unit, a second relay unit and a power supply unit, wherein the control unit comprises a control chip U4, the control chip U4 is STM8AF6213, the control chip U4 is connected with an upper computer through the interface unit, a control end of the first relay unit and a control end of the second relay unit are both connected with a control chip U4, a common end of the first relay unit and a common end of the second relay unit are both connected with a sensor interface J5, a normally closed end of the first relay unit is connected with a calibration plate interface J1, and a normally closed end of the second relay unit is connected with a collector interface J4; the power supply unit supplies power to other units.
The sensor interface J5 is connected with a pressure sensor to be calibrated, the sensing surface of the pressure sensor is connected with a pressure controller through an air pipe, and the pressure controller adjusts the air pressure under the control of an upper computer. The calibration plate interface J1 is connected with the chip pressure calibration plate, the collector interface J4 is connected with the collector, and the pressure calibration plate and the collector are both connected with the upper computer. The control unit firstly controls the first relay unit to communicate the pressure sensor with the pressure calibration plate, the pressure cooker reads the ADC value of each pressure calibration of the chip on duty, the upper computer calculates the calibration coefficient and writes the calibration coefficient into the pressure sensor through the pressure calibration plate, then the control unit controls the first relay unit to disconnect the connection between the pressure sensor and the pressure calibration plate, then controls the second relay unit to communicate the pressure sensor with the collector, the collector reads the output value of the pressure sensor, the upper computer calculates the compensation value according to the output value, the control unit controls the second relay unit to disconnect the connection between the pressure sensor and the collector, then controls the first relay unit to connect the pressure sensor with the pressure calibration plate, the pressure calibration plate writes the compensation value into the pressure sensor, and finally the control unit controls the first relay unit to disconnect the pressure sensor and the pressure calibration plate, and controlling the second relay unit to communicate the pressure sensor with the collector, and testing whether the detection value of the pressure sensor is normal.
Preferably, the first relay unit comprises a relay K1, the relay K1 is G6K-2F-Y-5VDC, pin 1 of the relay K1 is connected to the drain of a MOS transistor Q2, the source of the MOS transistor Q2 is connected to a power supply 5V, the gate of a MOS transistor Q2 is connected to the collector of a transistor Q1 through a resistor R5, the first end of a resistor R9 is connected to the source of a transistor Q2, the second end of a resistor R9 is connected to the collector of a transistor Q1, the drain of the MOS transistor Q2 is connected to the emitter of a transistor Q1 through a resistor R8, the anode of a diode D3 is connected to the emitter of a transistor Q1, the cathode of a diode D3 is connected to the collector of a transistor Q1, the emitter of a transistor Q1 is grounded, a resistor R7 is connected across the base and the emitter of a transistor Q1, and the base of the transistor Q1 is connected to pin 17 of a control chip U4 through a resistor R6; the pin 8 of the relay K1 is grounded, the anode of the diode D4 is connected with the pin 8 of the relay K1, and the cathode of the diode D4 is connected with the pin 1 of the relay K1; pins 3 and 6 of the relay K1 are respectively connected with pins 1 and 2 of the sensor interface J5, and pin 3 of the sensor interface J5 is grounded; pins 4 and 5 of the relay K1 are respectively connected with pins 1 and 2 of the calibration board interface J1, and pin 3 of the calibration board interface J1 is grounded; the first end of the resistor R19 is connected with the pin 3 of the relay K1, the second end of the resistor R19 is grounded through the resistor R22, and the pin 14 of the control chip U4 is connected with the second end of the resistor R19.
The first relay unit connects or disconnects the pressure sensor and the pressure calibration plate under the control of the control unit. The control unit chip U4 detects the state of the sensor relay through the 14-pin, ensuring accuracy.
Preferably, the second relay unit includes a relay K2, the relay K2 is G6K-2F-Y-5VDC, pin 1 of the relay K2 is connected to the drain of the MOS transistor Q3, the source of the MOS transistor Q3 is connected to the power supply 5V, the gate of the MOS transistor Q3 is connected to the collector of the transistor Q4 through a resistor R13, the first end of the resistor R14 is connected to the source of the MOS transistor Q3, the second end of the resistor R14 is connected to the collector of the transistor Q4, the drain of the MOS transistor Q3 is connected to the emitter of the transistor Q4 through a resistor R12, the anode of the diode D1 is connected to the emitter of the transistor Q4, the cathode of the diode D1 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the resistor R11 is connected across the base and the emitter of the transistor Q4, and the base of the transistor Q4 is connected to pin 13 of the control chip 4 through a resistor R10; the pin 8 of the relay K2 is grounded, the anode of the diode D2 is connected with the pin 8 of the relay K2, and the cathode of the diode D2 is connected with the pin 1 of the relay K2; pins 3 and 6 of the relay K2 are respectively connected with pins 1 and 2 of the sensor interface J5; pins 4 and 5 of the relay K2 are respectively connected with pins 1 and 2 of the collector interface J4, and pin 3 of the collector interface J4 is grounded.
The second relay unit connects or disconnects the pressure sensor and the collector under the control of the control unit.
Preferably, the interface unit includes a USB interface module, the USB interface module includes a USB chip U1, the USB chip U1 is CH340, pins 2 and 3 of the USB chip U1 are respectively connected to pins 3 and 2 of the control chip U4, and pins 5 and 6 of the USB chip U1 are respectively connected to pins 2 and 3 of the USB interface J40 through a resistor.
Preferably, the interface unit further includes a serial module, the serial module includes a serial chip U2, the serial chip U2 is a MAX3232CDR, pins 9 and 10 of the serial chip U2 are respectively connected to pins 3 and 2 of the control chip U4, and pins 7 and 8 of the serial chip U2 are respectively connected to pins 2 and 3 of the serial interface DSUB 1.
The control unit is connected with the upper computer through a USB interface or a serial port and controls the actions of the first relay unit and the second relay unit according to the instruction of the upper computer.
The calibration method has the advantages of reducing manual operation, improving efficiency, reducing operation complexity and improving calibration precision.
Drawings
FIG. 1 is a block circuit diagram of the present invention;
FIG. 2 is a circuit diagram of a control unit of the present invention;
FIG. 3 is a circuit diagram of a first relay unit of the present invention;
FIG. 4 is a circuit diagram of a second relay unit of the present invention;
FIG. 5 is a circuit diagram of a USB interface module of an interface unit according to the present invention;
FIG. 6 is a circuit diagram of a serial module of the present invention;
in the figure: 1. a control unit; 2. an interface unit; 3. a first relay unit; 4. a second relay unit; 5. a power supply unit; 6. a pressure sensor; 7. a pressure calibration plate; 8. a collector; 9. and (4) an upper computer.
Detailed Description
The technical scheme of the utility model is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the high-precision pressure sensor calibration circuit of the present embodiment, as shown in fig. 1, includes a control unit 1, an interface unit 2, a first relay unit 3, a second relay unit 4, and a power supply unit 5. As shown in fig. 2, the control unit includes a control chip U4, the control chip U4 is STM8AF6213, the control chip U4 is connected to the upper computer through an interface unit, the control end of the first relay unit and the control end of the second relay unit are both connected to the control chip U4, the common end of the first relay unit and the common end of the second relay unit are both connected to a sensor interface J5, the normally closed end of the first relay unit is connected to a calibration board interface J1, and the normally closed end of the second relay unit is connected to a collector interface J4; the power supply unit supplies power to other units.
As shown in fig. 3, the first relay unit includes a relay K1, the relay K1 is G6K-2F-Y-5VDC, pin 1 of the relay K1 is connected to the drain of a MOS transistor Q2, the source of the MOS transistor Q2 is connected to the power supply 5V, the gate of the MOS transistor Q2 is connected to the collector of a transistor Q1 through a resistor R5, the first end of a resistor R9 is connected to the source of the MOS transistor Q2, the second end of the resistor R9 is connected to the collector of a transistor Q1, the drain of the MOS transistor Q2 is connected to the emitter of a transistor Q1 through a resistor R8, the anode of a diode D3 is connected to the emitter of a transistor Q1, the cathode of a diode D3 is connected to the collector of a transistor Q1, the emitter of the transistor Q1 is grounded, the resistor R7 is connected across the base and the emitter of the transistor Q1, and the base of the transistor Q1 is connected to pin 17 of the control chip U4 through a resistor R6; the pin 8 of the relay K1 is grounded, the anode of the diode D4 is connected with the pin 8 of the relay K1, and the cathode of the diode D4 is connected with the pin 1 of the relay K1; pins 3 and 6 of the relay K1 are respectively connected with pins 1 and 2 of the sensor interface J5, and pin 3 of the sensor interface J5 is grounded; pins 4 and 5 of the relay K1 are respectively connected with pins 1 and 2 of the calibration board interface J1, and pin 3 of the calibration board interface J1 is grounded; the first end of the resistor R19 is connected with the pin 3 of the relay K1, the second end of the resistor R19 is grounded through the resistor R22, and the pin 14 of the control chip U4 is connected with the second end of the resistor R19.
The first relay unit connects or disconnects the pressure sensor and the pressure calibration plate under the control of the control unit. The control unit chip U4 detects the state of the sensor relay through the 14-pin, ensuring accuracy.
As shown in fig. 4, the second relay unit includes a relay K2, the relay K2 is G6K-2F-Y-5VDC, pin 1 of the relay K2 is connected to the drain of a MOS transistor Q3, the source of the MOS transistor Q3 is connected to the power supply 5V, the gate of the MOS transistor Q3 is connected to the collector of a transistor Q4 through a resistor R13, the first end of a resistor R14 is connected to the source of the MOS transistor Q3, the second end of the resistor R14 is connected to the collector of a transistor Q4, the drain of the MOS transistor Q3 is connected to the emitter of a transistor Q4 through a resistor R12, the anode of a diode D1 is connected to the emitter of a transistor Q4, the cathode of a diode D1 is connected to the collector of a transistor Q4, the emitter of the transistor Q4 is grounded, the resistor R11 is connected across the base and the emitter of the transistor Q4, and the base of the transistor Q4 is connected to the pin 13 of the control chip U4 through a resistor R10; the pin 8 of the relay K2 is grounded, the anode of the diode D2 is connected with the pin 8 of the relay K2, and the cathode of the diode D2 is connected with the pin 1 of the relay K2; pins 3 and 6 of the relay K2 are respectively connected with pins 1 and 2 of the sensor interface J5; pins 4 and 5 of the relay K2 are respectively connected with pins 1 and 2 of the collector interface J4, and pin 3 of the collector interface J4 is grounded.
The second relay unit connects or disconnects the pressure sensor and the collector under the control of the control unit.
The interface unit comprises a USB interface module and a serial port module. As shown in fig. 5, the USB interface module includes a USB chip U1, the USB chip U1 is CH340, pins 2 and 3 of the USB chip U1 are respectively connected to pins 3 and 2 of the control chip U4, and pins 5 and 6 of the USB chip U1 are respectively connected to pins 2 and 3 of the USB interface J40 through a resistor.
As shown in fig. 6, the serial module includes a serial chip U2, the serial chip U2 is MAX3232CDR, pins 9 and 10 of the serial chip U2 are connected to pins 3 and 2 of the control chip U4, respectively, and pins 7 and 8 of the serial chip U2 are connected to pins 2 and 3 of the serial interface DSUB1, respectively.
The control unit is connected with the upper computer through a USB interface or a serial port and controls the actions of the first relay unit and the second relay unit according to the instruction of the upper computer.
The sensor interface J5 is connected with a pressure sensor to be calibrated, the sensing surface of the pressure sensor is connected with a pressure controller through an air pipe, and the pressure controller adjusts the air pressure under the control of an upper computer. The calibration plate interface J1 is connected with the chip pressure calibration plate, the collector interface J4 is connected with the collector, and the pressure calibration plate and the collector are both connected with the upper computer. The control unit firstly controls the first relay unit to communicate the pressure sensor with the pressure calibration plate, the pressure cooker reads the ADC value of each pressure calibration of the chip on duty, the upper computer calculates the calibration coefficient and writes the calibration coefficient into the pressure sensor through the pressure calibration plate, then the control unit controls the first relay unit to disconnect the connection between the pressure sensor and the pressure calibration plate, then controls the second relay unit to communicate the pressure sensor with the collector, the collector reads the output value of the pressure sensor, the upper computer calculates the compensation value according to the output value, the control unit controls the second relay unit to disconnect the connection between the pressure sensor and the collector, then controls the first relay unit to connect the pressure sensor with the pressure calibration plate, the pressure calibration plate writes the compensation value into the pressure sensor, and finally the control unit controls the first relay unit to disconnect the pressure sensor and the pressure calibration plate, and controlling the second relay unit to communicate the pressure sensor with the collector, and testing whether the detection value of the pressure sensor is normal.
The specific embodiments described herein are merely illustrative of the principles of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the appended claims.
Although the terms control unit, relay unit, power supply unit, etc. are used more here, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any one of the additional limitations that fall within the spirit of the utility model.
Claims (5)
1. A high-precision pressure sensor calibration circuit is characterized by comprising a control unit, an interface unit, a first relay unit, a second relay unit and a power supply unit, wherein the control unit comprises a control chip U4, the control chip U4 is STM8AF6213, the control chip U4 is connected with an upper computer through the interface unit, a control end of the first relay unit and a control end of the second relay unit are both connected with the control chip U4, a common end of the first relay unit and a common end of the second relay unit are both connected with a sensor interface J5, a normally closed end of the first relay unit is connected with a calibration plate interface J1, and a normally closed end of the second relay unit is connected with a collector interface J4; the power supply unit supplies power to other units.
2. The high precision pressure sensor calibration circuit of claim 1, the first relay unit comprises a relay K1, the relay K1 is G6K-2F-Y-5VDC, a pin 1 of the relay K1 is connected with the drain electrode of a MOS tube Q2, the source electrode of a MOS tube Q2 is connected with 5V of a power supply, the grid electrode of the MOS tube Q2 is connected with the collector electrode of a triode Q1 through a resistor R5, the first end of a resistor R9 is connected with the source electrode of the MOS tube Q2, the second end of a resistor R9 is connected with the collector electrode of a triode Q1, the drain electrode of the MOS tube Q2 is connected with the emitter electrode of a triode Q1 through a resistor R8, the positive electrode of a diode D3 is connected with the emitter electrode of a triode Q1, the negative electrode of a diode D3 is connected with the collector electrode of a triode Q1, the emitter electrode of the triode Q1 is grounded, a resistor R7 is arranged between the base electrode of the triode Q1, and the base electrode of the triode Q1 is connected with a pin 17 of a control chip U4 through a resistor R6; the pin 8 of the relay K1 is grounded, the anode of the diode D4 is connected with the pin 8 of the relay K1, and the cathode of the diode D4 is connected with the pin 1 of the relay K1; pins 3 and 6 of the relay K1 are respectively connected with pins 1 and 2 of the sensor interface J5, and pin 3 of the sensor interface J5 is grounded; pins 4 and 5 of the relay K1 are respectively connected with pins 1 and 2 of the calibration board interface J1, and pin 3 of the calibration board interface J1 is grounded; the first end of the resistor R19 is connected with the pin 3 of the relay K1, the second end of the resistor R19 is grounded through the resistor R22, and the pin 14 of the control chip U4 is connected with the second end of the resistor R19.
3. The high precision pressure sensor calibration circuit of claim 2, the second relay unit comprises a relay K2, the relay K2 is G6K-2F-Y-5VDC, a pin 1 of the relay K2 is connected with the drain electrode of a MOS tube Q3, the source electrode of a MOS tube Q3 is connected with 5V of a power supply, the grid electrode of the MOS tube Q3 is connected with the collector electrode of a triode Q4 through a resistor R13, the first end of a resistor R14 is connected with the source electrode of the MOS tube Q3, the second end of a resistor R14 is connected with the collector electrode of a triode Q4, the drain electrode of the MOS tube Q3 is connected with the emitter electrode of a triode Q4 through a resistor R12, the positive electrode of a diode D1 is connected with the emitter electrode of a triode Q4, the negative electrode of a diode D1 is connected with the collector electrode of a triode Q4, the emitter electrode of the triode Q4 is grounded, a resistor R11 is arranged between the base electrode of the triode Q4, and the base electrode of the triode Q4 is connected with a pin 13 of a control chip U4 through a resistor R10; the pin 8 of the relay K2 is grounded, the anode of the diode D2 is connected with the pin 8 of the relay K2, and the cathode of the diode D2 is connected with the pin 1 of the relay K2; pins 3 and 6 of the relay K2 are respectively connected with pins 1 and 2 of the sensor interface J5; pins 4 and 5 of the relay K2 are respectively connected with pins 1 and 2 of the collector interface J4, and pin 3 of the collector interface J4 is grounded.
4. The high-precision pressure sensor calibration circuit according to claim 2 or 3, wherein the interface unit comprises a USB interface module, the USB interface module comprises a USB chip U1, the USB chip U1 is CH340, pins 2 and 3 of the USB chip U1 are respectively connected with pins 3 and 2 of the control chip U4, and pins 5 and 6 of the USB chip U1 are respectively connected with pins 2 and 3 of the USB interface J40 through a resistor.
5. The high-precision pressure sensor calibration circuit according to claim 3, wherein the interface unit further comprises a serial port module, the serial port module comprises a serial port chip U2, the serial port chip U2 is MAX3232CDR, pins 9 and 10 of the serial port chip U2 are respectively connected to pins 3 and 2 of the control chip U4, and pins 7 and 8 of the serial port chip U2 are respectively connected to pins 2 and 3 of a serial port interface DSUB 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123395254.2U CN216621600U (en) | 2021-12-31 | 2021-12-31 | High-precision pressure sensor calibration circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123395254.2U CN216621600U (en) | 2021-12-31 | 2021-12-31 | High-precision pressure sensor calibration circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216621600U true CN216621600U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123395254.2U Active CN216621600U (en) | 2021-12-31 | 2021-12-31 | High-precision pressure sensor calibration circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216621600U (en) |
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2021
- 2021-12-31 CN CN202123395254.2U patent/CN216621600U/en active Active
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