CN217278147U - Novel hydrogen concentration sensor master control circuit - Google Patents
Novel hydrogen concentration sensor master control circuit Download PDFInfo
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- CN217278147U CN217278147U CN202122434287.7U CN202122434287U CN217278147U CN 217278147 U CN217278147 U CN 217278147U CN 202122434287 U CN202122434287 U CN 202122434287U CN 217278147 U CN217278147 U CN 217278147U
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Abstract
The embodiment of the utility model provides a novel hydrogen concentration sensor master control circuit, include: the linear voltage stabilizer converts power supply voltage into working voltage required by the first heat conduction sensor chip, the second heat conduction sensor chip and the microcontroller and outputs the working voltage through a first voltage output end; the microcontroller adjusts the working voltage to the first heat conduction sensor chip; the first heat conduction sensor chip and the second heat conduction sensor chip detect gas concentration signals and convert the gas concentration signals into voltage signals; the output circuit comprises a first serial bus interface and a second serial bus interface, the voltage follower is used for buffering and stabilizing voltage signals, the effects of high reliability, high response speed, long service life, interference resistance, high precision and low temperature drift gas concentration metering can be achieved, and the output circuit is low in cost and small in size.
Description
Technical Field
The utility model relates to a gaseous technical field that detects, concretely relates to novel hydrogen concentration sensor master control circuit.
Background
The existing hydrogen sensor adopts an electrochemical gas principle circuit to adopt a single-path ADC for detection, and has the following defects: the temperature range is limited, and the temperature range is very sensitive to temperature and is easy to drift by temperature and zero drift; the cross sensitivity with other gases is high; the longer the exposure time to the target gas, the shorter the lifetime. Ground, life expectancy is one to three years; low humidity and high temperature can cause the electrolyte of the sensor to dry out; exposure to the target gas or interfering gas crossover also depletes the electrolyte on the sensor. Therefore, the problems of short service life, temperature drift and zero drift of the circuit of the hydrogen sensor in the prior art need to be solved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a novel hydrogen concentration sensor master control circuit can realize high reliability, high response speed, long life, anti-interference, high accuracy, low temperature and float the effect of gas concentration measurement, and with low costs, small.
The utility model provides a first aspect of the embodiment provides a novel hydrogen concentration sensor master control circuit, include: the temperature control circuit comprises a voltage stabilizing circuit, a field effect transistor, a first heat conduction sensor chip, a second heat conduction sensor chip, a microcontroller and an output circuit, wherein a first voltage output end of the voltage stabilizing circuit is respectively connected with the field effect transistor and the second heat conduction sensor chip, and the field effect transistor is connected with the first heat conduction sensor chip; the first heat conduction sensor chip and the second heat conduction sensor chip are connected with the microcontroller; the microcontroller is connected with the output circuit; wherein the content of the first and second substances,
the voltage stabilizing circuit comprises a linear voltage stabilizer, the linear voltage stabilizer is connected with the first voltage output end, and the linear voltage stabilizer is used for converting a power supply voltage VDD into working voltages required by the first heat conduction sensor chip, the second heat conduction sensor chip and the microcontroller and outputting the working voltages through the first voltage output end;
the microcontroller is used for adjusting the working voltage of the first heat conduction sensor chip;
the first heat conduction sensor chip and the second heat conduction sensor chip are used for detecting a gas concentration signal and converting the gas concentration signal into a voltage signal;
the output circuit comprises a first serial bus interface and a second serial bus interface, and the first serial bus interface, the second serial bus interface and the voltage follower are connected with the microcontroller; the linear voltage stabilizer is connected with the voltage follower through the field effect transistor Q1; the voltage follower is used for buffering and stabilizing the voltage signal.
Optionally, the microcontroller comprises a signal amplifier, an analog-to-digital conversion ADC module and a digital-to-analog DA converter;
the DA converter outputs a preset voltage value, controls the voltage follower U2, and buffers and stabilizes the voltage signal;
the signal amplifier is used for amplifying the voltage signal to obtain an amplified voltage signal;
and the ADC module is used for converting the amplified voltage signal into a digital voltage signal and outputting the digital voltage signal through a third voltage output end of the output circuit.
Optionally, the linear regulator includes a first input pin, a first ground pin, a first enable pin, a first feedback pin, and a first output pin;
the voltage stabilizing circuit further comprises a seventh capacitor, a sixth capacitor, a second resistor, a fifth resistor, a sixth resistor, an eighth capacitor and a ninth capacitor;
the first end of the seventh capacitor, the first end of the sixth capacitor, the first input pin and the first end of the second resistor are connected with a power supply voltage; a second end of the seventh capacitor, a second end of the sixth capacitor and the first grounding pin are grounded; the second end of the second resistor is connected with the first enabling pin;
the first end of the fifth resistor, the first end of the ninth capacitor, the first end of the eighth capacitor and the first output pin are connected with the first voltage output end; the second end of the fifth resistor, the first feedback pin and the first end of the sixth resistor are connected; a sixth end of the sixth resistor is grounded; and the second end of the ninth capacitor and the second end of the eighth capacitor are grounded.
Optionally, the main control circuit further includes a third resistor and a fourth resistor; the first thermal conduction sensor chip comprises a first thermocouple and a first heater, wherein the first heater comprises a first heating resistor and a second heating resistor; wherein the content of the first and second substances,
the first end of the fourth resistor and the source electrode of the field effect transistor are connected with the first voltage output end; the second end of the fourth resistor and the grid electrode of the field effect transistor are connected with a second voltage output end VTH-EN of the microcontroller; the drain electrode of the field effect transistor and the first end of the third resistor are connected with a third voltage output end VTH-OUT; the second end of the third resistor is connected with the first heating resistor of the first heat conduction sensor chip; the second heating resistor is grounded, and the first heating resistor is connected with the second end of the third resistor at the heating voltage end.
Optionally, the second thermal conductivity sensor chip comprises a second thermocouple and a second heater, the second heater comprising a third heating resistance and a fourth heating resistance;
the third heating resistor is connected with a signal output end HT of the output circuit;
the fourth heating resistor is grounded.
Optionally, the main control circuit further includes a third capacitor and a fourth capacitor; wherein the content of the first and second substances,
the anode of the first thermocouple and the first end of the third capacitor are connected with a first signal pin of the microcontroller to form a first signal end AN 1;
the anode of the second thermocouple and the second end of the third capacitor are connected with a second signal pin AN0 of the microcontroller;
the negative electrode of the first thermocouple, the negative electrode of the second thermocouple and the first end of the fourth capacitor are connected with a common-mode voltage end through a common-mode voltage pin VCM of the microcontroller; and the second end of the fourth capacitor is grounded.
Optionally, the main control circuit further includes a first resistor, a first capacitor, and a second capacitor; wherein the content of the first and second substances,
the first end of the first capacitor and a first power pin of the microcontroller are connected with the first voltage output end; the first end of the first resistor is connected with the first voltage output end;
the second end of the first resistor and the first end of the second capacitor are connected with a charging saturation voltage pin of the microcontroller;
the second end of the second capacitor, the second end of the first capacitor, the common voltage pin of the microcontroller and the analog voltage pin are grounded.
Optionally, the first serial bus interface includes a second power pin, a first programming clock input pin, a first data input/output pin, and a third ground pin; wherein the content of the first and second substances,
the second power supply pin is connected with the power supply voltage VDD;
the first programming clock input pin is connected with a second programming clock input pin of the microcontroller;
the first data input and output pin is connected with a second data input and output pin of the microcontroller; the third ground pin is grounded.
Optionally, the output circuit further comprises a first zener diode, a second zener diode, and a third zener diode; the second serial bus interface comprises an output voltage pin, an input voltage pin, a data line pin, a control line pin and a fourth grounding pin; wherein the content of the first and second substances,
the first end of the first voltage stabilizing diode and the input voltage pin are connected with the power supply voltage VDD;
the first end of the second voltage stabilizing diode is connected with a signal receiving pin of the microcontroller and the control line pin;
the first end of the third voltage stabilizing diode is connected with a signal sending pin, a serial clock pin and a data line pin of the microcontroller;
the second end of the first zener diode, the second end of the second zener diode, the second end of the third zener diode, and the fourth ground pin are grounded.
Optionally, the output circuit further comprises a fifth capacitor; wherein the content of the first and second substances,
the positive electrode input end of the voltage follower is connected with a first signal input and output pin of the microcontroller;
the negative electrode input end of the voltage follower and the first output end of the voltage follower are connected with the signal output end HT of the output circuit;
a second output end of the voltage follower and a first end of the fifth capacitor are connected with the third voltage output end; a second end of the fifth capacitor is grounded;
and the third output end of the voltage follower is grounded.
Implement the embodiment of the utility model provides a, following beneficial effect has at least:
it can be seen, through the utility model provides a novel hydrogen concentration sensor master control circuit, include: the voltage stabilizing circuit comprises a linear voltage stabilizer, the linear voltage stabilizer is connected with a first voltage output end, and the linear voltage stabilizer converts a power supply voltage VDD into working voltages required by the first heat conduction sensor chip, the second heat conduction sensor chip and the microcontroller and outputs the working voltages through the first voltage output end; the microcontroller adjusts the working voltage to the first heat conduction sensor chip; the first heat conduction sensor chip and the second heat conduction sensor chip detect gas concentration signals and convert the gas concentration signals into voltage signals; the output circuit comprises a first serial bus interface and a second serial bus interface, and the first serial bus interface, the second serial bus interface and the voltage follower are connected with the microcontroller; the linear voltage stabilizer is connected with the voltage follower through a field effect transistor Q1; the voltage follower is used for buffering and stabilizing voltage signals, can realize the effects of high reliability, high response speed, long service life, interference resistance, high precision and low-temperature drift gas concentration measurement, and has low cost and small volume.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a partial structure of a main control circuit of a novel hydrogen concentration sensor provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of a partial structure of a main control circuit of a novel hydrogen concentration sensor provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by a person skilled in the art that the described embodiments of the invention can be combined with other embodiments.
Please refer to fig. 1 and fig. 2, fig. 1 and fig. 2 are partial schematic structural diagrams of a novel hydrogen concentration sensor main control circuit provided in the present invention, the structural diagram of a novel hydrogen concentration sensor main control circuit of the present invention may include a voltage stabilizing circuit, a field effect transistor Q1, a first heat conduction sensor chip U5, a second heat conduction sensor chip U4, a microcontroller U1 and an output circuit, a first voltage output end VHT of the voltage stabilizing circuit is connected to the field effect transistor Q1 and the second heat conduction sensor chip U4 respectively, and the field effect transistor Q1 is connected to the first heat conduction sensor chip U5; a first heat conduction sensor chip U5 and a second heat conduction sensor chip U4 are connected with the microcontroller U1; the microcontroller U1 is connected with the output circuit; the voltage regulator circuit part shown in fig. 1, and the other parts except the voltage regulator circuit shown in fig. 2 include a field effect transistor Q1, a first thermal conductivity sensor chip U5, a second thermal conductivity sensor chip U4, a microcontroller U1, and an output circuit.
The voltage stabilizing circuit comprises a linear voltage regulator U3, the linear voltage regulator U3 is connected with the first voltage output end VHT, and the linear voltage regulator U3 is used for converting a power supply voltage VDD into working voltages required by the first heat conduction sensor chip U5, the second heat conduction sensor chip U4 and the microcontroller U1 and outputting the working voltages through the first voltage output end VHT;
the microcontroller is used for adjusting the working voltage of the first heat conduction sensor chip;
the first heat conduction sensor chip U5 and the second heat conduction sensor chip U4 are used for detecting a gas concentration signal and converting the gas concentration signal into a voltage signal;
the output circuit comprises a first serial bus interface J1, a second serial bus interface J2, the first serial bus interface J1, the second serial bus interface J2 and the voltage follower U2 are connected with the microcontroller U1; the linear voltage stabilizer is connected with the voltage follower U2 through the field effect transistor Q1; the voltage follower U2 is used to buffer and stabilize the voltage signal.
The first voltage output end of the linear regulator U3 is connected to the microcontroller U1, and the linear regulator U3 is connected to the voltage follower U2 via the field effect transistor Q1, as shown in fig. 1.
The U3 has the function of providing stable voltage for the microcontroller U1 and the voltage follower U2, the voltage follower U2 has the function of serving as a voltage follower, and the PIN PIN2 of the microcontroller U1 controls the output voltage of the operational amplifier through digital-to-analog conversion, so that the effect of adjusting the working voltage heated by the first heat conduction sensor chip U5 and the heat conduction sensor chip U5 is achieved.
When the main control circuit is connected with a power supply voltage for power supply, the microcontroller starts to work, outputs a high level and controls the field effect transistor Q1 to be switched on and off, so that power is supplied to the first heat conduction sensor chip U5, and the first heat conduction sensor chip U5 starts to work.
Microcontroller passes through DA converter output preset voltage value, control voltage follower U2, and voltage follower U2 plays buffering, and the isolation effect improves and takes the load capacity. The output voltage is approximate to the input voltage amplitude, and is in a high resistance state for the front-stage circuit and a low resistance state for the rear-stage circuit, so that the front-stage circuit and the rear-stage circuit are approximately isolated. The second thermal conductivity sensor chip U4 is brought into operation by supplying power to the second thermal conductivity sensor chip U4 through the voltage follower U2.
The signal changes generated by the first heat conduction sensor chip U5 and the second heat conduction sensor chip U4 enter a signal amplifier inside the microcontroller as differential signals, the differential signals are amplified by the signal amplifier and then detected by an ADC module inside the microcontroller, and the ADC module converts the signals into digital voltage signals which can be identified by a digital circuit. When the external hydrogen concentration changes, signals generated by the first heat conduction sensor chip U5 and the second heat conduction sensor chip U4 change, and corresponding hydrogen concentration values are output after calculation.
In this scheme, through the function that microcontroller control ADC module adjusted first heat-conduction sensor chip U5 heating voltage to reach the function of automatically regulated benchmark zero point, thereby, can realize the effect of high reliability, high response speed, long life, anti-interference, high accuracy, low temperature drift gas concentration measurement, and with low costs, small.
Optionally, the microcontroller comprises a signal amplifier, an analog-to-digital conversion ADC module and a digital-to-analog DA converter;
the DA converter outputs a preset voltage value, controls the voltage follower U2, and buffers and stabilizes the voltage signal;
the signal amplifier is used for amplifying the voltage signal to obtain an amplified voltage signal;
and the ADC module is used for converting the amplified voltage signal into a digital voltage signal and outputting the digital voltage signal through a third voltage output end of the output circuit.
Optionally, the linear regulator includes a first input pin IN, a first ground pin END, a first enable pin EN, a first feedback pin FB, and a first output pin OUT;
the voltage stabilizing circuit further comprises a seventh capacitor C7, a sixth capacitor C6, a second resistor R2, a fifth resistor R5, a sixth resistor R6, an eighth capacitor C8 and a ninth capacitor C9;
the first end of the seventh capacitor C7, the first end of the sixth capacitor C6, the first input pin and the first end of the second resistor R2 are connected with a power supply voltage VDD; a second terminal of the seventh capacitor C7, a second terminal of the sixth capacitor C6, and a first ground pin are grounded; a second end of the second resistor R2 is connected with the first enabling pin;
the first end of the fifth resistor R5, the first end of the ninth capacitor C9, the first end of the eighth capacitor C8 and the first output pin are connected to the first voltage output terminal; the second end of the fifth resistor R5, the first feedback pin and the first end of the sixth resistor R6 are connected; a sixth end of the sixth resistor R6 is grounded; the second end of the ninth capacitor C9 and the second end of the eighth capacitor C8 are grounded.
Optionally, the master control circuit further includes a third resistor R3 and a fourth resistor R4; the first thermal conduction sensor chip comprises a first thermocouple and a first heater, wherein the first heater comprises a first heating resistor and a second heating resistor; wherein the content of the first and second substances,
a first end of the fourth resistor R4 and a source of the field effect transistor Q1 are connected to the first voltage output terminal VHT; the second end of the fourth resistor R4 and the gate of the field effect transistor Q1 are connected with a second voltage output end VTH-EN of the microcontroller; the drain of the field effect transistor Q1 and the first end of the third resistor R3 are connected to a third voltage output terminal VTH-OUT; a second end of the third resistor R3 is connected to a first heating resistor of the first thermal conductivity sensor chip U5; the second heating resistor is grounded, and the first heating resistor is connected with the second end of the third resistor.
Optionally, the second thermal conductivity sensor chip U4 includes a second thermocouple and a second heater, the second heater including a third heating resistance and a fourth heating resistance;
the third heating resistor is connected with a signal output end HT of the output circuit;
the fourth heating resistor is grounded.
Optionally, the master control circuit further includes a third capacitor C3 and a fourth capacitor C4; wherein, the first and the second end of the pipe are connected with each other,
the anode of the first thermocouple and the first end of the third capacitor are connected with a first signal pin of the microcontroller to form a first signal end AN 1;
the anode of the second thermocouple and the second end of the third capacitor are connected with a second signal pin AN0 of the microcontroller;
the negative electrode of the first thermocouple, the negative electrode of the second thermocouple and the first end of the fourth capacitor are connected with a common-mode voltage pin VCM of the microcontroller through a common-mode voltage end; and the second end of the fourth capacitor is grounded.
Optionally, the main control circuit further includes a first resistor, a first capacitor, and a second capacitor; wherein the content of the first and second substances,
the first end of the first capacitor and a first power pin of the microcontroller are connected with the first voltage output end; the first end of the first resistor is connected with the first voltage output end;
the second end of the first resistor R1 and the first end of the second capacitor C2 are connected with a charging saturation voltage pin of the microcontroller;
the second terminal of the second capacitor C2, the second terminal of the first capacitor C1, the common voltage pin and the analog voltage pin of the microcontroller are grounded.
Optionally, the first serial bus interface includes a second power pin, a first programming clock input pin, a first data input/output pin, and a third ground pin; wherein the content of the first and second substances,
the second power supply pin is connected with the power supply voltage VDD;
the first programming clock input pin is connected with a second programming clock input pin of the microcontroller;
the first data input and output pin is connected with a second data input and output pin of the microcontroller; the third ground pin is grounded.
Optionally, the output circuit further comprises a first zener diode D1, a second zener diode D2, and a third zener diode D3; the second serial bus interface J2 comprises an output voltage pin, an input voltage pin, a data line pin, a control line pin and a fourth ground pin; wherein the content of the first and second substances,
the first end of the first voltage stabilizing diode D1 and the input voltage pin are connected with the power supply voltage VDD;
a first end of the second zener diode D2 is connected with the signal receiving pin of the microcontroller U1 and the control line pin;
a first end of the third zener diode D3 is connected to the signal transmission pin, the serial clock pin and the data line pin of the microcontroller U1;
the second terminal of the first zener diode D1, the second terminal of the second zener diode D2, the second terminal of the third zener diode D3, and the fourth ground pin are grounded.
Optionally, the output circuit further comprises a fifth capacitor C5; wherein the content of the first and second substances,
the positive electrode input end of the voltage follower U2 is connected with a first signal input and output pin of the microcontroller;
the negative electrode input end of the voltage follower U2 and the first output end of the voltage follower U2 are connected with the signal output end HT of the output circuit;
the second output terminal of the voltage follower U2 and the first terminal of the fifth capacitor are connected to the third voltage output terminal VHT-OUT; a second end of the fifth capacitor C5 is grounded;
the third output terminal of the voltage follower U2 is connected to ground.
It can be seen, through the utility model provides a novel hydrogen concentration sensor master control circuit, include: the voltage stabilizing circuit comprises a linear voltage stabilizer, the linear voltage stabilizer is connected with a first voltage output end, and the linear voltage stabilizer converts a power supply voltage VDD into working voltages required by the first heat conduction sensor chip, the second heat conduction sensor chip and the microcontroller and outputs the working voltages through the first voltage output end; the microcontroller adjusts the working voltage to the first heat conduction sensor chip; the first heat conduction sensor chip and the second heat conduction sensor chip detect gas concentration signals and convert the gas concentration signals into voltage signals; the output circuit comprises a first serial bus interface and a second serial bus interface, and the first serial bus interface, the second serial bus interface and the voltage follower are connected with the microcontroller; the linear voltage stabilizer is connected with the voltage follower through a field effect transistor Q1; the voltage follower is used for buffering and stabilizing voltage signals, can realize the effects of high reliability, high response speed, long service life, interference resistance, high precision and low-temperature drift gas concentration measurement, and has low cost and small volume.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A novel hydrogen concentration sensor master control circuit, characterized in that includes: the temperature control circuit comprises a voltage stabilizing circuit, a field effect transistor, a first heat conduction sensor chip, a second heat conduction sensor chip, a microcontroller and an output circuit, wherein a first voltage output end of the voltage stabilizing circuit is respectively connected with the field effect transistor and the second heat conduction sensor chip, and the field effect transistor is connected with the first heat conduction sensor chip; the first heat conduction sensor chip and the second heat conduction sensor chip are connected with the microcontroller; the microcontroller is connected with the output circuit; wherein the content of the first and second substances,
the voltage stabilizing circuit comprises a linear voltage stabilizer, the linear voltage stabilizer is connected with the first voltage output end, and the linear voltage stabilizer is used for converting power supply voltage into working voltage required by the first heat conduction sensor chip, the second heat conduction sensor chip and the microcontroller and outputting the working voltage through the first voltage output end;
the microcontroller is used for adjusting the working voltage of the first heat conduction sensor chip;
the first heat conduction sensor chip and the second heat conduction sensor chip are used for detecting a gas concentration signal and converting the gas concentration signal into a voltage signal;
the output circuit comprises a first serial bus interface and a second serial bus interface, and the first serial bus interface, the second serial bus interface and the voltage follower are connected with the microcontroller; the linear voltage stabilizer is connected with the voltage follower through the field effect transistor; the voltage follower is used for buffering and stabilizing the voltage signal.
2. The circuit of claim 1, wherein the microcontroller comprises a signal amplifier, an analog-to-digital conversion (ADC) module, and a digital-to-analog (DA) converter;
the DA converter outputs a preset voltage value, controls the voltage follower and buffers and stabilizes the voltage signal;
the signal amplifier is used for amplifying the voltage signal to obtain an amplified voltage signal;
and the ADC module is used for converting the amplified voltage signal into a digital voltage signal and outputting the digital voltage signal through a third voltage output end of the output circuit.
3. The circuit of claim 2, wherein the linear regulator comprises a first input pin, a first ground pin, a first enable pin, a first feedback pin, and a first output pin;
the voltage stabilizing circuit further comprises a seventh capacitor, a sixth capacitor, a second resistor, a fifth resistor, a sixth resistor, an eighth capacitor and a ninth capacitor;
the first end of the seventh capacitor, the first end of the sixth capacitor, the first input pin and the first end of the second resistor are connected with a power supply voltage; a second end of the seventh capacitor, a second end of the sixth capacitor and the first grounding pin are grounded; the second end of the second resistor is connected with the first enabling pin;
the first end of the fifth resistor, the first end of the ninth capacitor, the first end of the eighth capacitor and the first output pin are connected with the first voltage output end; the second end of the fifth resistor, the first feedback pin and the first end of the sixth resistor are connected; a sixth end of the sixth resistor is grounded; and the second end of the ninth capacitor and the second end of the eighth capacitor are grounded.
4. The circuit of any of claims 1-3, wherein the master circuit further comprises a third resistor and a fourth resistor; the first thermal conduction sensor chip comprises a first thermocouple and a first heater, wherein the first heater comprises a first heating resistor and a second heating resistor; wherein the content of the first and second substances,
the first end of the fourth resistor and the source electrode of the field effect transistor are connected with the first voltage output end; the second end of the fourth resistor and the grid electrode of the field effect transistor are connected with a second voltage output end of the microcontroller; the drain electrode of the field effect transistor and the first end of the third resistor are connected with a third voltage output end; the second end of the third resistor is connected with the first heating resistor of the first heat conduction sensor chip; the second heating resistor is grounded, and the first heating resistor is connected with the second end of the third resistor.
5. The circuit of claim 4, wherein the second thermal conductivity sensor chip comprises a second thermocouple and a second heater, the second heater comprising a third heating resistance and a fourth heating resistance;
the third heating resistor is connected with a signal output end of the output circuit;
the fourth heating resistor is grounded.
6. The circuit of claim 5, wherein the master circuit further comprises a third capacitor and a fourth capacitor; wherein the content of the first and second substances,
the anode of the first thermocouple and the first end of the third capacitor are connected with a first signal end through a first signal pin of the microcontroller;
the anode of the second thermocouple and the second end of the third capacitor are connected with a second signal end through a second signal pin of the microcontroller;
the negative electrode of the first thermocouple, the negative electrode of the second thermocouple and the first end of the fourth capacitor are connected with a common-mode voltage pin of the microcontroller; and the second end of the fourth capacitor is grounded.
7. The circuit of claim 6, wherein the master circuit further comprises a first resistor, a first capacitor, and a second capacitor; wherein the content of the first and second substances,
the first end of the first capacitor and a first power pin of the microcontroller are connected with the first voltage output end; the first end of the first resistor is connected with the first voltage output end;
the second end of the first resistor and the first end of the second capacitor are connected with a charging saturation voltage pin of the microcontroller;
the second end of the second capacitor, the second end of the first capacitor, the common voltage pin of the microcontroller and the analog voltage pin are grounded.
8. The circuit of claim 7, wherein the first serial bus interface comprises a second power supply pin, a first programming clock input pin, a first data input output pin, a third ground pin; wherein the content of the first and second substances,
the second power supply pin is connected with the power supply voltage;
the first programming clock input pin is connected with a second programming clock input pin of the microcontroller;
the first data input and output pin is connected with a second data input and output pin of the microcontroller; the third ground pin is grounded.
9. The circuit of claim 8, wherein the output circuit further comprises a first zener diode, a second zener diode, and a third zener diode; the second serial bus interface comprises an output voltage pin, an input voltage pin, a data line pin, a control line pin and a fourth grounding pin; wherein the content of the first and second substances,
the first end of the first voltage stabilizing diode and the input voltage pin are connected with the power supply voltage;
the first end of the second voltage stabilizing diode is connected with a signal receiving pin of the microcontroller and the control line pin;
the first end of the third voltage stabilizing diode is connected with a signal sending pin, a serial clock pin and a data line pin of the microcontroller;
the second end of the first zener diode, the second end of the second zener diode, the second end of the third zener diode, and the fourth ground pin are grounded.
10. The circuit of claim 9, wherein the output circuit further comprises a fifth capacitor; wherein the content of the first and second substances,
the positive input end of the voltage follower is connected with a first signal input/output pin of the microcontroller;
the negative input end of the voltage follower and the first output end of the voltage follower are connected with the signal output end of the output circuit;
a second output end of the voltage follower and a first end of the fifth capacitor are connected with the third voltage output end; a second end of the fifth capacitor is grounded;
and the third output end of the voltage follower is grounded.
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