CN216349243U - Temperature sensor constant current source circuit of volume correction instrument, volume correction instrument and gas meter - Google Patents
Temperature sensor constant current source circuit of volume correction instrument, volume correction instrument and gas meter Download PDFInfo
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- CN216349243U CN216349243U CN202122676373.9U CN202122676373U CN216349243U CN 216349243 U CN216349243 U CN 216349243U CN 202122676373 U CN202122676373 U CN 202122676373U CN 216349243 U CN216349243 U CN 216349243U
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Abstract
The utility model is suitable for the technical field of temperature sensor control, and provides a temperature sensor constant current source circuit of a volume corrector, the volume corrector and a gas meter. The embodiment of the utility model adopts the modes of operational amplifier and external resistor to provide the constant current source, provides the constant current for the temperature sensor and ensures the stability and the precision of temperature sampling. Meanwhile, the differential signal input circuit is adopted to process the sampled temperature signal, so that common mode interference can be well inhibited, the anti-interference capability is strong, and the signal transmission and processing are more accurate.
Description
Technical Field
The utility model belongs to the technical field of temperature sensor control, and particularly relates to a temperature sensor constant current source circuit of a volume corrector, the volume corrector and a gas meter.
Background
The gas meter controls the switching and metering of the gas, but because the gas is susceptible to thermal expansion and cold contraction, the measurement of the gas is interfered by the change of temperature, and therefore, a volume corrector is usually installed in the gas meter for correcting the volume change of the gas according to the temperature change. The volume correction instrument is internally provided with a temperature sensor for acquiring the actual temperature in a scene, and adjusts the volume coefficient of the gas according to the acquired temperature, so that the more accurate gas metering volume is obtained, the error is reduced, and the loss and dispute of a user and a gas company are avoided.
Therefore, the data collected by the temperature sensor greatly influences the final correction effect, the temperature data is limited by the sensitivity of the temperature sensor on one hand, and is influenced by the design of the collection driving circuit on the other hand, so that the collected data is distorted, and finally, the error is larger. The existing temperature sensor driving circuit usually adopts a voltage source to supply power to a temperature sensor, and the condition that the acquired data is not stable enough can occur; the acquired analog signals are often directly AD-converted into digital signals for processing, and the risk of data errors is increased to a certain extent.
Therefore, a scheme capable of stably and accurately acquiring data acquired by the temperature sensor is lacking.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a temperature sensor constant current source circuit of a volume corrector, the volume corrector and a gas meter, wherein a constant current source is provided by using an operational amplifier and an external resistor, so as to provide a constant current for a temperature sensor and ensure stability and precision of temperature sampling. Meanwhile, the differential signal input circuit is adopted to process the sampled temperature signal, so that common mode interference can be well inhibited, the anti-interference capability is strong, and the signal transmission and processing are more accurate.
The first aspect of the embodiment of the utility model provides a temperature sensor constant current source circuit of a volume corrector, which comprises a temperature sensor interface, a power supply module and a temperature signal processing chip, wherein a group of differential signal input ends of the temperature signal processing chip is connected with a first differential signal input circuit or a second differential signal input circuit, and a group of signal input ends of the first differential signal input circuit or the second differential signal input circuit is connected with a group of signal output ends of the temperature sensor interface;
the power supply module comprises a reference power supply unit and a first operational amplifier, wherein the input end of the reference power supply unit is connected with a power supply VAA, the reference voltage output end of the reference power supply unit is connected with the inverting input end of the first operational amplifier after being connected with a first zero five resistor in series, the reference voltage output end is connected with the non-inverting input end of the first operational amplifier after being connected with a first zero seven resistor in series, the non-inverting input end of the first operational amplifier is connected with the first zero resistor in series and then is grounded, and the inverting input end and the output end of the first operational amplifier are respectively connected with a first power supply input pin and a second power supply input pin of the temperature sensor interface.
Through the design, the voltage source is changed into the current source in a mode of operational amplifier and external resistor, and the voltage source is very stable in reference voltage, so that the current sources output by the inverting input end and the output end of the first operational amplifier are constant current sources, and the output of I + "I-" provides constant current for the temperature sensor, thereby ensuring the stability and the precision of temperature sampling. Meanwhile, the differential signal input circuit is adopted to process the sampled temperature signals, so that the differential signals of the two acquisition ends are obtained, the common mode interference can be well inhibited, the anti-interference capability is strong, and the signal transmission and processing are more accurate.
Furthermore, the first differential signal input circuit comprises a first five-to-one resistor, a first seven-to-one resistor, a first nine-to-one resistor, a first zero-six capacitor and a first zero-seven capacitor;
one end of the first one-to-five resistor is connected with the first signal output end of the temperature sensor interface, the other end of the first one-to-five resistor is connected with the first differential signal input end of the first differential signal input end group of the temperature signal processing chip, one end of the first one-to-nine resistor is connected with the second signal output end of the temperature sensor interface, the other end of the first one-to-nine resistor is connected with the second differential signal input end of the first differential signal input end group of the temperature signal processing chip, and two ends of the first one-to-seven resistor are respectively connected with the first signal output end and the second signal output end;
two ends of the first zero-sixth capacitor are respectively connected with the first differential signal input end and the second differential signal input end of the first differential signal input end group, and two ends of the first zero-seventh capacitor are respectively connected with the first signal output end and the second signal output end.
The first differential signal input circuit is used for respectively inputting sampled signal values into an input end group of a differential signal processing chip (temperature signal processing chip) after two paths of differential processing, and converting the sampled signal values into digital signals after differential operation, wherein the mode of differential processing is superior to the mode of direct AD conversion in data stability and accuracy.
Further, the second differential signal input circuit includes a second operational amplifier and a third operational amplifier;
the inverting input end of the second operational amplifier is connected with a first resistor, a second resistor and a third resistor in series and then grounded, the non-inverting input end of the second operational amplifier is connected with a second signal output end of the temperature sensor interface after being connected with a first resistor, a first resistor and a second resistor are connected between the output end and the inverting input end of the second operational amplifier in series, and the output end of the second operational amplifier is also connected with the inverting input end of the third operational amplifier after being connected with a first resistor, a second resistor and a fifth resistor in series;
the non-inverting input end of the third operational amplifier is connected with the first signal output end of the temperature sensor interface after being connected with a first diode and a second diode in series, a first diode and a second diode are connected between the output end and the inverting input end of the third operational amplifier in series, the output end of the third operational amplifier is connected with the first diode and the second diode after being connected with a first diode and a second diode in series, the first differential signal input end of the second differential signal input end group of the temperature signal processing chip is connected, the second differential signal input end of the second differential signal input end group is grounded, and the output end of the third operational amplifier is connected with the first capacitor and the second capacitor in series and then is grounded.
The second differential signal input circuit adopts a differential amplification mode, two collected values are subtracted and amplified by a certain factor and then input to an input end group of the differential signal processing chip, the differential signal processing chip carries out AD conversion on the input differential amplified signal value, and the amplification factor is determined by peripheral resistors of the second operational amplifier and the third operational amplifier. Differential amplification can also stabilize the transmission and processing of analog signals well.
In comparison, the data value processed by the second differential signal input circuit is the amplification factor of the difference value of the two paths of signals of the first differential signal input circuit, and the amplified value is processed by the singlechip corresponding to the adjustment factor.
Furthermore, the first differential signal input end of the second differential signal input end group is also connected with a first three-zero resistor in series and then connected with the temperature amplification analog signal input end of the volume correction instrument singlechip.
The analog signal of the differential amplification is directly input into the singlechip, the singlechip can directly process the analog signal, and the data value recording and the circuit correction are facilitated.
Furthermore, a first output pin of the temperature sensor interface is connected in series with a first third inductor and then serves as a first signal output end of the signal output end group, and the first signal output end is connected in series with a first capacitor and then grounded;
and a second output pin of the temperature sensor interface is connected with a first four-inductor in series and then serves as a second signal output end of the signal output end group, and the second signal output end is connected with a first zero capacitor in series and then is grounded.
The inductor and the capacitor play a role in filtering, and signal interference is avoided.
Furthermore, the temperature signal processing chip is a dual-channel sixteen-bit AD conversion processor, and the temperature signal processing chip includes two differential analog signal input terminal sets, wherein the first differential analog signal input terminal set is connected to the first differential signal input circuit, and the second differential analog signal input terminal set is connected to the second differential signal input circuit;
the reference voltage input end of the temperature signal processing chip is connected with the reference voltage output end of the reference power supply unit, the power pin of the temperature signal processing chip is connected with the power supply VAA, and the digital signal communication end group of the temperature signal processing chip is connected with the SPI bus.
The temperature signal processing chip also adopts a reference power supply to process signals, so that the stability of data processing is greatly improved, and meanwhile, two differential signal input circuits are adopted, so that the accuracy of data can be verified mutually conveniently, for example, when a signal value acquired by one circuit is more stable than that acquired by the other circuit within a certain time, the circuit element of the unstable circuit can be readjusted, so that a differential circuit serving as a working circuit and the other differential circuit serving as a detection and calibration circuit of working current are formed. Or, the signal values input by the two differential circuits can be subjected to differential operation to improve the accuracy of the data.
Furthermore, the power supply VAA is connected with the drain electrode of the P-channel MOS tube after being connected with the first zero-four resistor in series, the source electrode of the P-channel MOS tube is connected with 3V voltage, and the grid electrode of the P-channel MOS tube is connected with a VAA power supply control pin of the volume corrector singlechip.
The power supply VAA of the whole drive circuit is controlled and started by the single chip microcomputer, so that the single chip microcomputer can conveniently and uniformly control the work.
Furthermore, a first signal output end of the signal output end group is connected with a first temperature analog signal input end of the volume correction instrument single chip microcomputer after being connected with a first diode and a second diode in series, and a second signal output end of the signal output end group is connected with a second temperature analog signal input end of the volume correction instrument single chip microcomputer after being connected with a first diode and a second diode and a resistor in series.
Analog signals collected by the temperature sensor can be directly input into the single chip microcomputer, and the analog signals can be processed in the single chip microcomputer.
The second aspect of the embodiment of the utility model provides a gas volume corrector, which comprises a volume corrector single chip microcomputer and a temperature sensor, wherein a temperature sensor constant current source circuit of the volume corrector is arranged between the volume corrector single chip microcomputer and the temperature sensor.
The third aspect of the embodiment of the utility model provides a gas meter, which comprises the gas volume correction instrument.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects:
the embodiment of the utility model adopts the modes of operational amplifier and external resistor to provide the constant current source, provides the constant current for the temperature sensor and ensures the stability and the precision of temperature sampling. Meanwhile, the differential signal input circuit is adopted to process the sampled temperature signal, so that common mode interference can be well inhibited, the anti-interference capability is strong, and the signal transmission and processing are more accurate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a constant current source circuit of a temperature sensor of a volume corrector according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a second differential signal input circuit in the constant current source circuit of the temperature sensor of the volume correction instrument according to the second embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a power supply VAA part in a constant current source circuit of a temperature sensor of the volume correction instrument according to the embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an analog signal input single chip in a temperature sensor constant current source circuit of the volume correction instrument according to the embodiment of the present invention.
Detailed Description
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The embodiment of the utility model adopts the following technical scheme:
the first embodiment is as follows:
referring to fig. 1, the present embodiment provides a temperature sensor constant current source circuit of a volume corrector, including a temperature sensor interface X5, a power supply module and a temperature signal processing chip U17, a first differential signal input terminal group (AIN1+ and AIN1-) of the temperature signal processing chip U17 and a signal output terminal group (PT _ AD1 and PT _ AD2) connected to the temperature sensor interface X5;
the power supply module comprises a reference power supply unit U15 and a first operational amplifier U12, wherein the input end of the reference power supply unit U15 is connected with a power supply VAA, a reference voltage output end VREF of the reference power supply unit U15 is connected with a first zero five resistor R105 in series and then connected with the inverting input end of a first operational amplifier U12, the reference voltage output end VREF is further connected with a first zero seven resistor in series and then R107 is connected with the non-inverting input end of a first operational amplifier U12, the non-inverting input end of the first operational amplifier U12 is further connected with a first zero resistor R110 in series and then grounded, and the inverting input end and the output end of the first operational amplifier U12 are respectively connected with a first power supply input pin I + and a second power supply input pin I-of the temperature sensor interface X5.
In this embodiment, the operating voltage of the first operational amplifier U12 is also provided by the power supply VAA.
The first differential signal input circuit comprises a first five-to-one resistor R115, a first seven-to-one resistor R117, a first nine-to-one resistor R119, a first zero-six capacitor C106 and a first zero-seven capacitor C107;
one end of a first one-to-five resistor R115 is connected with a first signal output end PT _ AD1 of the temperature sensor interface X5, the other end of the first one-to-five resistor R115 is connected with a first differential signal input end AIN1+ of a first differential signal input end group of the temperature signal processing chip U17, one end of a first one-to-nine resistor R119 is connected with a second signal output end PT _ AD2 of the temperature sensor interface X5, the other end of the first one-to-five resistor R is connected with a second differential signal input end AIN 1-of the first differential signal input end group of the temperature signal processing chip U17, and two ends of a first one-to-seven resistor R117 are respectively connected with a first signal output end PT _ AD1 and a second signal output end PT _ AD 2;
two ends of the first zero-sixth capacitor C106 are respectively connected to the first differential signal input terminal AIN1+ and the second differential signal input terminal AIN1+ of the first differential signal input terminal group, and two ends of the first zero-seventh capacitor C107 are respectively connected to the first signal output terminal PT _ AD1 and the second signal output terminal PT _ AD 2.
The temperature signal processing chip U17 is a dual-channel sixteen-bit AD conversion processor, the temperature signal processing chip U17 includes two differential analog signal input terminal groups, only one of which is used in this embodiment, that is, the first differential analog signal input terminal group is connected to the first differential signal input circuit;
the reference voltage input end REF + of the temperature signal processing chip U17 is connected with the reference voltage output end VREF of the reference power supply unit U15, the power supply pin VCC of the temperature signal processing chip U17 is connected with the power supply VAA, and the digital signal communication end group of the temperature signal processing chip U17 is connected with the SPI bus and comprises signal pins such as DIN, DOUT, DRDY, CS and RESET.
In this embodiment, the power supply VAA is connected in series with the first zero-four resistor R104 and then connected to the drain of the P-channel MOS transistor T18, the source of the T18 is connected to the 3V voltage (VCC3V0), the gate of the T18 is connected to the VAA power supply control pin P _ Analog of the volume corrector single chip, as shown in fig. 3, a protection capacitor C101 of the power supply VAA is further provided.
Referring to fig. 4, the first signal output terminal PT _ AD1 is connected in series with the first diode and the fourth resistor R124 and then connected to the first temperature analog signal input terminal TEMP _ AD1 of the volume corrector single chip microcomputer, and the second signal output terminal PT _ AD2 is connected in series with the first diode and the ninth resistor R129 and then connected to the second temperature analog signal input terminal TEMP _ AD2 of the volume corrector single chip microcomputer.
The working principle of the embodiment is as follows:
the U15 provides a stable reference power source VREF for the U17, and the U12 converts the reference power source VREF into constant current sources I + and I-, so as to stably supply power for the temperature sensor;
PT _ AD1 and PT _ AD2 are subjected to AD conversion through two paths of differential inputs U17, and finally stable temperature signal values are formed.
Example two:
the design of this embodiment is different from the first embodiment in that only the second set of two sets of differential analog signal input terminals of the temperature signal processing chip U17 is used, the second set of differential analog signal input terminals (AIN2+ and AIN2-) is connected to the second differential signal input circuit, and the rest is similar to the first embodiment, and only the part of the first differential signal input circuit in fig. 1 is correspondingly deleted.
Referring to fig. 2, the second differential signal input circuit of the present embodiment includes a second operational amplifier U13A and a third operational amplifier U13B;
the inverting input end of the second operational amplifier U13A is connected in series with the first two-three resistor R123 and then grounded, the non-inverting input end of the second operational amplifier U13A is connected in series with the first two-seven resistor R127 and then connected with the second signal output end PT _ AD2 of the temperature sensor interface X5, the first two-one resistor R121 is connected in series between the output end and the inverting input end of the second operational amplifier U13A, and the output end of the second operational amplifier U13A is also connected in series with the first two-five resistor R125 and then connected with the inverting input end of the third operational amplifier U13B;
the non-inverting input end of the third operational amplifier U13B is connected in series with the first and second resistors R128 and then connected to the first signal output end PT _ AD1 of the temperature sensor interface X5, the first and second resistors R122 are connected in series between the output end and the inverting input end of the third operational amplifier U13B, the output end of the third operational amplifier U13B is also connected in series with the first and second resistors R126 and then connected to the first differential signal input end AIN2+ of the second differential signal input end group of the temperature signal processing chip U17, the second differential signal input end AIN 2-of the second differential signal input end group is grounded, and the output end of the third operational amplifier U13B is also connected in series with the first and ninth zero capacitors C109 and then grounded.
The first differential signal input end AIN2+ (also TEMP _ OP) of the second differential signal input end group is also connected in series with the first three-zero resistor R130 and then connected with the temperature amplification analog signal input end TEMP _ OP _ AD of the volume correction instrument singlechip.
In this embodiment, a first output pin (pin 2) of the temperature sensor interface X5 is serially connected to the third inductor L13 to serve as a first signal output terminal PT _ AD1 of the signal output terminal group, and the first signal output terminal PT _ AD1 is serially connected to the first capacitor C111 and then grounded;
a second output pin (pin 3) of the temperature sensor interface X5 is connected in series with the first four inductors L14 to serve as a second signal output terminal PT _ AD2 of the signal output terminal group, and the second signal output terminal PT _ AD2 is connected in series with the first zero capacitors C110 to be grounded.
The design of the rest is similar to the embodiment, see fig. 1, 3 and 4, and will not be described herein.
The working principle of the embodiment is as follows:
the U15 provides a stable reference power source VREF for the U17, and the U12 converts the reference power source VREF into constant current sources I + and I-, so as to stably supply power for the temperature sensor;
the PT _ AD1 and PT _ AD2 are processed by two operational amplifiers in the second differential signal input circuit, and then the signal value A (PT _ AD 1-PT _ AD2) is input into U17 for AD conversion. Where A is the amplification factor, determined by the peripheral resistance of the two operational amplifiers.
Example three:
in this embodiment, the first and second embodiments are combined, that is, two sets of differential analog signal input terminals of the temperature signal processing chip U17 are used, the first set of differential analog signal input terminals is connected to the first differential signal input circuit, and the second set of differential analog signal input terminals is connected to the second differential signal input circuit, and the specific design refers to fig. 1 to 4 and the above embodiments.
The working principle of the embodiment is as follows:
the U15 provides a stable reference power source VREF for the U17, and the U12 converts the reference power source VREF into constant current sources I + and I-, so as to stably supply power for the temperature sensor;
the PT _ AD1 and the PT _ AD2 are subjected to AD conversion in the first differential signal input circuit through two paths of differential inputs U17, and finally stable temperature signal values are formed.
The PT _ AD1 and PT _ AD2 are processed by two operational amplifiers in the second differential signal input circuit, and then the signal value A (PT _ AD 1-PT _ AD2) is input into U17 for AD conversion. Where A is the amplification factor, determined by the peripheral resistance of the two operational amplifiers.
The two differential circuits of this embodiment are used as a detection and calibration for each other.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A temperature sensor constant current source circuit of a volume corrector comprises a temperature sensor interface, a power supply module and a temperature signal processing chip, and is characterized in that a group of differential signal input ends of the temperature signal processing chip are connected with a first differential signal input circuit or a second differential signal input circuit, and a signal input end group of the first differential signal input circuit or the second differential signal input circuit is connected with a signal output end group of the temperature sensor interface;
the power supply module comprises a reference power supply unit and a first operational amplifier, wherein the input end of the reference power supply unit is connected with a power supply VAA, the reference voltage output end of the reference power supply unit is connected with the inverting input end of the first operational amplifier after being connected with a first zero five resistor in series, the reference voltage output end is connected with the non-inverting input end of the first operational amplifier after being connected with a first zero seven resistor in series, the non-inverting input end of the first operational amplifier is connected with the first zero resistor in series and then is grounded, and the inverting input end and the output end of the first operational amplifier are respectively connected with a first power supply input pin and a second power supply input pin of the temperature sensor interface.
2. The temperature sensor constant current source circuit of a volume correction instrument according to claim 1, wherein said first differential signal input circuit comprises a first five-to-one resistor, a first seven-to-one resistor, a first nine-to-one resistor, a first zero-six capacitor and a first zero-seven capacitor;
one end of the first one-to-five resistor is connected with the first signal output end of the temperature sensor interface, the other end of the first one-to-five resistor is connected with the first differential signal input end of the first differential signal input end group of the temperature signal processing chip, one end of the first one-to-nine resistor is connected with the second signal output end of the temperature sensor interface, the other end of the first one-to-nine resistor is connected with the second differential signal input end of the first differential signal input end group of the temperature signal processing chip, and two ends of the first one-to-seven resistor are respectively connected with the first signal output end and the second signal output end;
two ends of the first zero-sixth capacitor are respectively connected with the first differential signal input end and the second differential signal input end of the first differential signal input end group, and two ends of the first zero-seventh capacitor are respectively connected with the first signal output end and the second signal output end.
3. The temperature sensor constant current source circuit of a volume correction instrument according to claim 1, wherein said second differential signal input circuit comprises a second operational amplifier and a third operational amplifier;
the inverting input end of the second operational amplifier is connected with a first resistor, a second resistor and a third resistor in series and then grounded, the non-inverting input end of the second operational amplifier is connected with a second signal output end of the temperature sensor interface after being connected with a first resistor, a first resistor and a second resistor are connected between the output end and the inverting input end of the second operational amplifier in series, and the output end of the second operational amplifier is also connected with the inverting input end of the third operational amplifier after being connected with a first resistor, a second resistor and a fifth resistor in series;
the non-inverting input end of the third operational amplifier is connected with the first signal output end of the temperature sensor interface after being connected with a first diode and a second diode in series, a first diode and a second diode are connected between the output end and the inverting input end of the third operational amplifier in series, the output end of the third operational amplifier is connected with the first diode and the second diode after being connected with a first diode and a second diode in series, the first differential signal input end of the second differential signal input end group of the temperature signal processing chip is connected, the second differential signal input end of the second differential signal input end group is grounded, and the output end of the third operational amplifier is connected with the first capacitor and the second capacitor in series and then is grounded.
4. The temperature sensor constant current source circuit of claim 3, wherein the first differential signal input terminal of the second differential signal input terminal set is further connected in series with a first three-zero resistor and then connected with the temperature amplifying analog signal input terminal of the volume corrector single chip microcomputer.
5. The temperature sensor constant current source circuit of the volume correction instrument as claimed in claim 1, wherein the first output pin of the temperature sensor interface is connected in series with a first third inductor and then serves as a first signal output terminal of the signal output terminal group, and the first signal output terminal is connected in series with a first capacitor and then grounded;
and a second output pin of the temperature sensor interface is connected with a first four-inductor in series and then serves as a second signal output end of the signal output end group, and the second signal output end is connected with a first zero capacitor in series and then is grounded.
6. The constant current source circuit of the temperature sensor of the volume correction instrument as claimed in claim 1, wherein the temperature signal processing chip is a two-channel sixteen-bit AD conversion processor, and the temperature signal processing chip comprises two groups of differential analog signal input terminals, wherein a first group of differential analog signal input terminals is connected with the first differential signal input circuit, and a second group of differential analog signal input terminals is connected with the second differential signal input circuit;
the reference voltage input end of the temperature signal processing chip is connected with the reference voltage output end of the reference power supply unit, the power pin of the temperature signal processing chip is connected with the power supply VAA, and the digital signal communication end group of the temperature signal processing chip is connected with the SPI bus.
7. The temperature sensor constant current source circuit of the volume correction instrument as claimed in claim 1, wherein the power supply VAA is connected in series with the first zero-four resistor and then connected to the drain of a P-channel MOS transistor, the source of the P-channel MOS transistor is connected to a 3V voltage, and the gate of the P-channel MOS transistor is connected to the VAA power supply control pin of the volume correction instrument single chip microcomputer.
8. The temperature sensor constant current source circuit of claim 1, wherein a first signal output terminal of the signal output terminal set is connected to a first temperature analog signal input terminal of the volume corrector single chip microcomputer after being connected to a first two-four resistor in series, and a second signal output terminal of the signal output terminal set is connected to a second temperature analog signal input terminal of the volume corrector single chip microcomputer after being connected to a first two-nine resistor in series.
9. A gas volume correction instrument comprising a volume correction instrument single chip microcomputer and a temperature sensor, characterized in that a temperature sensor constant current source circuit of a volume correction instrument according to any one of claims 1 to 8 is provided between the volume correction instrument single chip microcomputer and the temperature sensor.
10. A gas meter comprising a gas volume correction instrument as claimed in claim 9.
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| CN202122676373.9U CN216349243U (en) | 2021-10-29 | 2021-10-29 | Temperature sensor constant current source circuit of volume correction instrument, volume correction instrument and gas meter |
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| CN202122676373.9U CN216349243U (en) | 2021-10-29 | 2021-10-29 | Temperature sensor constant current source circuit of volume correction instrument, volume correction instrument and gas meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114063494A (en) * | 2021-10-29 | 2022-02-18 | 重庆前卫表业有限公司 | Temperature sensor drive circuit and gas table of gas volume correction appearance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114063494A (en) * | 2021-10-29 | 2022-02-18 | 重庆前卫表业有限公司 | Temperature sensor drive circuit and gas table of gas volume correction appearance |
| CN114063494B (en) * | 2021-10-29 | 2024-06-25 | 重庆前卫表业有限公司 | Temperature sensor driving circuit of gas volume corrector and gas meter |
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