CN216954938U - High-precision pointer digital display pressure gauge control circuit - Google Patents
High-precision pointer digital display pressure gauge control circuit Download PDFInfo
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- CN216954938U CN216954938U CN202123006588.6U CN202123006588U CN216954938U CN 216954938 U CN216954938 U CN 216954938U CN 202123006588 U CN202123006588 U CN 202123006588U CN 216954938 U CN216954938 U CN 216954938U
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Abstract
The utility model discloses a high-precision pointer digital display pressure gauge control circuit, which comprises a power supply, a sensor, a comparison amplifier, a CPU and a reference voltage circuit, wherein the power supply is used for supplying power to a pointer control module, the sensor, the comparison amplifier and the CPU, the sensor is attached to the inner side wall of a spring tube, a pressure sensor is adopted, the input end of the comparison amplifier is connected with the output end of the reference voltage circuit and the output end of the sensor through leads, namely: the output end of the comparison amplifier is connected with an analog-to-digital converter to realize conversion from an analog signal to a digital signal, and the digital circuit after conversion of the analog signal is input to a CPU for processing and is displayed through a nixie tube. In addition, a voltage division circuit is used for driving the pointer pressure gauge to realize mechanical display.
Description
Technical Field
The utility model relates to the technical field of pressure detection, in particular to a high-precision pointer digital display pressure gauge control circuit
Background
The pressure gauge is a meter which takes an elastic element as a sensitive element and measures and indicates the pressure higher than the ambient pressure, is very commonly applied and almost extends to all the fields of industrial processes and scientific researches. The method is widely available in the fields of heating power pipe networks, oil and gas transmission, water and gas supply systems, vehicle maintenance plants and shops and the like. Especially in the industrial process control and technical measurement process, the mechanical pressure gauge is more and more widely applied due to the characteristics of high mechanical strength, convenient production and the like of the elastic sensitive element of the mechanical pressure gauge.
The mechanical pressure gauge comprises a pointer, a spring tube, a bourdon tube and an electromagnet, wherein the pointer and the spring tube are linked through a pointer control module comprising a movement and a connecting rod, a medium is introduced into the pressure gauge through a joint, the bourdon tube generates elastic deformation, and the elastic deformation of the bourdon tube is converted into rotary motion through a conversion mechanism of the movement in the pressure gauge, so that the pointer deflects.
The existing pressure gauge has single display function, namely pointer type or digital type, and has single display function, so that the pressure gauge is inconvenient to read in a narrow space.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the display function of the existing pressure gauge is single.
In order to solve the technical problems, the utility model adopts the technical scheme that: a high-precision pointer digital display pressure gauge control circuit comprises a reference voltage module, a pressure sensor, a comparison amplification module, a digital-to-analog conversion module, a main control module, a nixie tube and a voltage division module, wherein the comparison amplification module comprises a first operational amplifier IC3-a, a second operational amplifier IC3-b, a third operational amplifier IC3-c and a fourth operational amplifier IC3-d, the homodromous input end of the fourth operational amplifier IC3-d is connected with the reference voltage module, the reverse input end of the fourth operational amplifier IC3-d is connected with a voltage source, the output end of the fourth operational amplifier IC3-d is connected with the homodromous input end of a first operational amplifier IC3-a after amplification, the output end of the pressure sensor is connected with the homodromous input end of the first operational amplifier IC3-a, the reverse input end of the first operational amplifier IC3-a is connected with a resistor R17 and then grounded, the reverse input end of the first operational amplifier IC3-a is connected with the output end of the first operational amplifier IC3-a after passing through the resistor R16, the output end of the first operational amplifier IC3-a is connected with the reverse input end of the second operational amplifier IC3-b, and the positive power pin of the first operational amplifier IC3-a is also connected with the input end of the sensor; the output end of the second operational amplifier IC3-b is connected with a digital-to-analog converter and a voltage dividing circuit, the voltage dividing circuit is used for supplying power to an ammeter, the homodromous input end of the second operational amplifier IC3-b is connected with the output end of the third operational amplifier IC3-c, the digital-to-analog converter is connected with a main control module, and the main control module is connected with a nixie tube; and the reverse input end of the third operational amplifier IC3-c is connected with the reference voltage circuit, the reverse input end is connected with the output end through a variable resistor R12, and the homodromous input end is connected with the resistor R11 and then grounded.
Further, the reference voltage module includes two zener diodes connected in series, which are a zener diode D1 and a zener diode D2, respectively, where the cathode of the zener diode D1 is connected to 15v voltage, and the anode of the zener diode D2 is grounded; the anode of the zener diode D1 is connected to the non-inverting input of the fourth operational amplifier IC3-D, and the cathode of the zener diode D2 is connected to the inverting input of the third operational amplifier IC 3-c.
Further, the device comprises an NPN type triode, wherein the base electrode of the triode is connected with the output end of the fourth operational amplifier IC3-d, and the collector electrode of the triode is connected with a voltage source and the reverse input end of the fourth operational amplifier IC 3-d; the emitter is connected with a rectifier bridge stack and then is connected with the same-direction input end of the first operational amplifier IC 3-a.
Further, the technical scheme shows that the utility model has the following advantages: the digital pressure gauge and the pointer type pressure gauge are combined, high-precision real-time display can be achieved through the digital pressure gauge, meanwhile, visual display can be achieved through the pointer, and the digital pressure gauge and the pointer have the advantages of digital display and the pointer.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings.
As shown in fig. 1, the high-precision pointer digital display pressure gauge control circuit of the present invention includes a power supply, a reference voltage module, a pressure sensor, a comparison and amplification module, a digital-to-analog conversion module, a main control module, a nixie tube, and a voltage division module. The pressure sensor is a B26QUP120M quartz crystal pressure sensor in the embodiment, the rated range of pressure is 0-120Mpa, the pressure sensor can be used in environments of high temperature and high pressure of oil and natural gas fields, the pressure sensor is attached to the inner side wall of a spring tube of a pressure gauge, the pressure sensor is symmetrically attached to the inner wall of the spring tube along the axis, and the pressure sensor embodies the high-frequency sampling characteristic and is used for collecting deformation signals of the spring tube.
The reference voltage module comprises two serially connected Zener diodes, namely a Zener diode D1 and a Zener diode D2, wherein the cathode of the Zener diode D1 is connected with 15v voltage, and the anode of the Zener diode D2 is grounded.
The specific principle of the comparison amplification module is as follows: comprising a first operational amplifier IC3-a, a second operational amplifier IC3-b, a third operational amplifier IC3-c, and a fourth operational amplifier IC3-d, the homodromous input end of the fourth operational amplifier IC3-d is connected with the reference voltage module, the reverse input end is connected with the voltage source, the output end is connected with the homodromous input end of the first operational amplifier IC3-a after being amplified, the output end of the pressure sensor is connected with the same-direction input end of a first operational amplifier IC3-a, the reverse input end of the first operational amplifier IC3-a is connected with a resistor R17 and then grounded, the reverse input end of the first operational amplifier IC3-a is connected with the output end of the first operational amplifier IC3-a through a resistor R16, the output end of the first operational amplifier IC3-a is connected with the reverse input end of a second operational amplifier IC3-b, and the positive power pin of the first operational amplifier IC3-a is also connected with the input end of the sensor; the output end of the second operational amplifier IC3-b is connected with a digital-to-analog converter and a voltage dividing circuit, the voltage dividing circuit is used for supplying power to an electric meter, the homodromous input end of the second operational amplifier IC3-b is connected with the output end of the third operational amplifier IC3-c, the digital-to-analog converter is connected with a main control module, the main control module is connected with a nixie tube, and the nixie tube displays corresponding pressure information according to the acquired analog signals. The inverting input end of the third operational amplifier IC3-c is connected with the reference voltage circuit, the inverting input end is connected with the output end through the variable resistor R12, and the homodromous input end is connected with the resistor R11 and then is grounded. The anode of the zener diode D1 is connected to the non-inverting input of the fourth operational amplifier IC3-D, and the cathode of the zener diode D2 is connected to the inverting input of the third operational amplifier IC 3-c.
In addition, the utility model comprises an NPN type triode, wherein the base electrode of the triode is connected with the output end of the fourth operational amplifier IC3-d, and the collector electrode of the triode is connected with a voltage source and the reverse input end of the fourth operational amplifier IC 3-d; the emitter is connected with a rectifier bridge stack and then is connected with the same-direction input end of the first operational amplifier IC 3-a.
Compared amplification and temperature compensation of signals are realized by comparing a plurality of comparison amplifiers, and high-precision output is realized.
The voltage division circuit consists of a resistor R25 and a resistor R26, one end of the resistor R26 is connected with a power supply, the other end of the resistor R26 is connected with the output end of the reference voltage circuit and the series resistor R25, and the other end of the resistor R25 is grounded. The current is divided by resistors to produce different magnetic moments, which are then balanced by springs. The spring force of the spring is related to the deformation according to the hooke's definite force. Thus, the greater the magnetic moment, the greater the spring force required to reach the equilibrium point, and the more the spring is compressed. Different currents (magnetic moments) correspond to different positions (spring type variables). The voltage division circuit is used for driving the spring tube to deform, so that the pointer is controlled to rotate to the corresponding pressure value. The above description is already described in the patent with the application number of cn202110171448.x, and is not repeated herein.
Claims (3)
1. The utility model provides a high accuracy pointer digital display manometer control circuit, includes reference voltage module, pressure sensor, comparison amplification module, digifax conversion module, host system, charactron and partial pressure module, its characterized in that:
the comparison amplification module comprises a first operational amplifier IC3-a, a second operational amplifier IC3-b, a third operational amplifier IC3-c and a fourth operational amplifier IC3-d, wherein the same-direction input end of the fourth operational amplifier IC3-d is connected with a reference voltage module, the reverse input end of the fourth operational amplifier IC3-d is connected with a voltage source, the output end of the fourth operational amplifier IC3-d is connected with the same-direction input end of the first operational amplifier IC3-a after amplification, the output end of the pressure sensor is connected with the same-direction input end of the first operational amplifier IC3-a, the reverse input end of the first operational amplifier IC3-a is connected with the resistor R17 and then grounded, the reverse input end of the first operational amplifier IC3-a is connected with the output end of the first operational amplifier IC 16 after passing through the resistor R16, the output end of the first operational amplifier IC3-a is connected with the reverse input end of the second operational amplifier IC3-b, the positive power supply pin of the first operational amplifier IC3-a is also connected with the input end of the sensor; the output end of the second operational amplifier IC3-b is connected with a digital-to-analog converter and a voltage dividing circuit, the voltage dividing circuit is used for supplying power to an electric meter, the homodromous input end of the second operational amplifier IC3-b is connected with the output end of the third operational amplifier IC3-c, the digital-to-analog converter is connected with a main control module, and the main control module is connected with a nixie tube; and the reverse input end of the third operational amplifier IC3-c is connected with the reference voltage circuit, the reverse input end is connected with the output end through a variable resistor R12, and the homodromous input end is connected with the resistor R11 and then grounded.
2. The control circuit of the high-precision pointer digital display pressure gauge according to claim 1, characterized in that: the reference voltage module comprises two Zener diodes which are connected in series, namely a Zener diode D1 and a Zener diode D2, wherein the negative electrode of the Zener diode D1 is connected with 15v voltage, and the positive electrode of the Zener diode D2 is grounded; the anode of the zener diode D1 is connected to the non-inverting input of the fourth operational amplifier IC3-D, and the cathode of the zener diode D2 is connected to the inverting input of the third operational amplifier IC 3-c.
3. The control circuit of the high-precision pointer digital display pressure gauge according to claim 1, characterized in that: the NPN type triode is characterized by comprising an NPN type triode, wherein the base electrode of the triode is connected with the output end of a fourth operational amplifier IC3-d, and the collector electrode of the triode is connected with a voltage source and the reverse input end of a fourth operational amplifier IC 3-d; the emitter is connected with a rectifier bridge stack and then is connected with the same-direction input end of the first operational amplifier IC 3-a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123006588.6U CN216954938U (en) | 2021-12-01 | 2021-12-01 | High-precision pointer digital display pressure gauge control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123006588.6U CN216954938U (en) | 2021-12-01 | 2021-12-01 | High-precision pointer digital display pressure gauge control circuit |
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| Publication Number | Publication Date |
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| CN216954938U true CN216954938U (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123006588.6U Active CN216954938U (en) | 2021-12-01 | 2021-12-01 | High-precision pointer digital display pressure gauge control circuit |
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2021
- 2021-12-01 CN CN202123006588.6U patent/CN216954938U/en active Active
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