CN116614134B - Chlorine dioxide gas sensor hybrid integrated circuit - Google Patents
Chlorine dioxide gas sensor hybrid integrated circuit Download PDFInfo
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- CN116614134B CN116614134B CN202310869203.3A CN202310869203A CN116614134B CN 116614134 B CN116614134 B CN 116614134B CN 202310869203 A CN202310869203 A CN 202310869203A CN 116614134 B CN116614134 B CN 116614134B
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- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 239000004155 Chlorine dioxide Substances 0.000 title claims abstract description 87
- 235000019398 chlorine dioxide Nutrition 0.000 title claims abstract description 87
- 239000000523 sample Substances 0.000 claims abstract description 43
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 230000003321 amplification Effects 0.000 claims description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 16
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- 230000001965 increasing effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- H—ELECTRICITY
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- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
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- H—ELECTRICITY
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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Abstract
The invention discloses a chlorine dioxide gas sensor hybrid integrated circuit, and relates to the technical field of chlorine dioxide gas sensors and application thereof. Comprising the following steps: the circuit comprises an analog circuit PCB circuit board and a digital circuit PCB circuit board, wherein the analog circuit PCB circuit board and the digital circuit PCB circuit board are connected together by adopting a double-layer aliasing structure; the simulation circuit PCB is used for receiving and processing the simulation signals acquired by the chlorine dioxide gas sensor probe; the digital circuit PCB is used for receiving the analog signals processed by the analog circuit PCB and converting the analog signals into digital signals for processing. Through the structure, the invention not only reduces the volume of the chlorine dioxide gas sensor hybrid integrated circuit, but also improves the electromagnetic compatibility of the chlorine dioxide gas sensor hybrid integrated circuit.
Description
Technical Field
The invention relates to the technical field of chlorine dioxide gas sensors and application thereof, in particular to a small-volume high-precision chlorine dioxide gas sensor hybrid integrated circuit.
Background
At present, the characteristics of the existing chlorine dioxide gas sensors with different brands and models have great discreteness, and the output current signals are weak, so that the common amplifying circuit is difficult to detect and amplify the chlorine dioxide gas sensors. Thus, the application of chlorine dioxide gas sensors in gas sterilizer is limited.
Since the output current signal of the chlorine dioxide gas sensor is very weak, the improvement of the accuracy of the chlorine dioxide gas sensor must be performed in two ways, namely, increasing the concentration of the chlorine dioxide gas and increasing the gain of the amplifying circuit. When the concentration of the chlorine dioxide gas is increased, the resolution of the chlorine dioxide gas sensor is sacrificed, so that the chlorine dioxide gas at trace level is difficult to detect; increasing the gain of the amplifying circuit can amplify noise signals at the same time, so that the signal to noise ratio of the amplifier is deteriorated, and trace-level chlorine dioxide gas is difficult to detect and distinguish. At the same time, higher circuit gain can cause positive feedback of the circuit, degrading the stability of the circuit, and critical circuit stability reduces the redundancy of the circuit, affecting the reliability of the circuit.
In order to improve the accuracy of the chlorine dioxide gas sensor for accurate control in the chlorine dioxide gas sterilizer, it is generally necessary to accurately detect the concentration of the chlorine dioxide gas. The chlorine dioxide gas sterilizer accurately controls the release rate of the chlorine dioxide gas by detecting the concentration of the chlorine dioxide gas in the air. The chlorine dioxide gas sensor belongs to a current type device, and the output current of the chlorine dioxide gas sensor is in direct proportion to the concentration of chlorine dioxide gas. The matching circuit of the chlorine dioxide gas sensor probe amplifies the output current and outputs the output current in the form of voltage, so that the gain of the matching circuit has the dimension of resistance, and is also called as a transimpedance amplifier. The transimpedance amplifier with excellent performance can amplify weak current signals, so that the purpose of improving the precision of the chlorine dioxide gas sensor is achieved.
Typically, chlorine dioxide gas sensor probes are soldered individually to a circuit board and then connected to the motherboard by a wiring harness. Such a wire harness may be equivalently an inductive coil or a receiving antenna, and may introduce spatial electromagnetic interference signals. The matched conventional circuit board is also quite large, and the copper-clad layer in the circuit board can be equivalent to a distributed capacitor, so that various electromagnetic interferences are easily introduced to influence the stability and the reliability of the circuit operation.
In summary, how to provide a small-volume high-precision chlorine dioxide gas sensor hybrid integrated circuit is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a chlorine dioxide gas sensor hybrid integrated circuit for solving some or all of the technical problems in the background art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a chlorine dioxide gas sensor hybrid integrated circuit comprising:
the circuit comprises an analog circuit PCB circuit board and a digital circuit PCB circuit board, wherein the analog circuit PCB circuit board and the digital circuit PCB circuit board are connected together by adopting a double-layer aliasing structure;
the simulation circuit PCB is used for receiving and processing the simulation signals acquired by the chlorine dioxide gas sensor probe;
the digital circuit PCB is used for receiving the analog signals processed by the analog circuit PCB and converting the analog signals into digital signals for processing.
Preferably, a probe matching circuit connected with the chlorine dioxide gas sensor probe is arranged on the PCB, and the probe matching circuit comprises a current-voltage conversion circuit, a high-gain amplifying circuit and a low-pass filter circuit which are sequentially connected.
Preferably, the current-voltage conversion circuit comprises a transimpedance operational amplifier circuit, the transimpedance operational amplifier circuit comprises a first operational amplifier, a positive input end of the first operational amplifier inputs a first bias voltage, a negative input end of the first operational amplifier is connected with an output end of the chlorine dioxide gas sensor probe, and a first phase compensation network is connected between the negative input end and the output end of the first operational amplifier.
Preferably, the high gain amplifying circuit comprises an inverting amplifying circuit, the inverting amplifying circuit comprises a second operational amplifier, a positive input end of the second operational amplifier inputs a second bias voltage, a negative input end of the second operational amplifier is connected with an output end of the current-voltage converting circuit, and a second phase compensating network is connected between the negative input end and the output end of the second operational amplifier.
Preferably, a gain switching circuit is further connected between the negative input end and the output end of the second operational amplifier.
Preferably, the gain switching circuit comprises a single-pole double-throw switch, a first gain switching resistor and a second gain switching resistor, wherein two output ends of the single-pole double-throw switch are respectively connected with one end of the first gain switching resistor and one end of the second gain switching resistor, and the other end of the first gain switching resistor and the other end of the second gain switching resistor are both connected with the output end of the second operational amplifier.
Preferably, the low-pass filter circuit includes a third operational amplifier, a positive input end of the third operational amplifier is connected with an output end of the high-gain amplifying circuit, a negative input end of the third operational amplifier inputs a positive voltage, and a first resistor and a first capacitor are connected in parallel between the negative input end and the output end of the third operational amplifier.
Preferably, a microcontroller chip and a power management circuit are arranged on the digital circuit PCB, the microcontroller chip is connected with the output end of the low-pass filter, and the power management circuit is used for providing power for each component in the chlorine dioxide gas sensor hybrid integrated circuit.
Compared with the prior art, the invention discloses the chlorine dioxide gas sensor mixed integrated circuit, which comprises the analog circuit PCB and the digital circuit PCB which are connected together by adopting a double-layer aliasing structure, wherein the chlorine dioxide gas sensor probe is tightly welded on the PCB, the wiring harness connection of the chlorine dioxide gas sensor is omitted, meanwhile, the whole mixed integrated circuit adopts the double-layer aliasing technology, the volume of the chlorine dioxide gas sensor mixed integrated circuit is fully reduced, the area of a copper-clad layer is reduced, and the parasitic capacitance effect caused by the large-area copper-clad layer is eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure provided by the present invention;
FIG. 2 is a schematic diagram of a probe matching circuit structure provided by the invention;
fig. 3 is a schematic diagram of specific circuit connection of an analog circuit PCB according to an embodiment of the present invention;
fig. 4 is a schematic diagram of specific circuit connection of a digital circuit PCB according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, an embodiment of the present invention discloses a chlorine dioxide gas sensor hybrid integrated circuit, comprising: the analog circuit PCB circuit board and the digital circuit PCB circuit board are connected together by adopting a double-layer aliasing structure; the simulation circuit PCB is used for receiving and processing the simulation signals acquired by the chlorine dioxide gas sensor probe; the digital circuit PCB is used for receiving the analog signals processed by the analog circuit PCB and converting the analog signals into digital signals for processing.
In the embodiment, the chlorine dioxide gas sensor probe is directly and tightly welded on the PCB of the analog circuit, so that the wiring harness connection of the chlorine dioxide gas sensor probe is reduced, the influence of parasitic inductance caused by wiring harnesses is eliminated, meanwhile, the whole structure adopts the double-layer aliasing design of the PCB of the analog circuit and the PCB of the digital circuit, the volume of the hybrid integrated circuit is reduced, and meanwhile, the copper coating layer of the hybrid integrated circuit is separated, the parasitic capacitance effect caused by overlarge copper coating area on the PCB of the single-layer PCB is avoided, and the electromagnetic compatibility of the hybrid integrated circuit of the chlorine dioxide gas sensor is improved.
The analog circuit and the digital circuit in the double-layer circuit board are mutually overlapped, the limited area of the circuit board is fully utilized, and the double-layer circuit board is paved with a grounding copper-clad layer in a large area to strengthen heat dissipation and reduce EMI, and meanwhile, the interference of the outside on the circuit can be effectively reduced. In the double-layer PCB, the area without the signal wire is used as the grounding copper-clad layer, so that the aliasing refers to mutual aliasing of components on the electrical connection. Similarly, the aliasing technique is also applicable to the design of similar multi-layer PCB circuit boards.
In this embodiment, all physical devices are located on the upper surface of the PCB, and are closely arranged according to the size of the devices. The electrical connection of each device is respectively on the middle layer and the bottom layer PCB circuit board.
In addition, due to the adoption of the design of the miniaturized circuit board, the influence of distributed capacitance and inductance, which belong to inert elements, is avoided, and the delay effect on the quick signal of the circuit is realized. Because the current on the inductor cannot be ramped, the voltage on the capacitor cannot be ramped. Through the design of the miniaturized circuit board, the transmission inertia of the circuit is eliminated, and the response speed of the chlorine dioxide gas sensor is obviously improved.
In this embodiment, a probe matching circuit connected with a chlorine dioxide gas sensor probe is provided on a PCB of an analog circuit, and as shown in fig. 2, the probe matching circuit includes a current-voltage conversion circuit, a high-gain amplification circuit, and a low-pass filter circuit, which are sequentially connected.
The following describes the specific contents of the probe matching circuit: in this embodiment, the current-voltage conversion circuit is mainly composed of a transimpedance operational amplifier circuit, and the transimpedance operational amplifier circuit mainly includes a first operational amplifier, wherein a positive input terminal of the first operational amplifier inputs a first bias voltage, a negative input terminal of the first operational amplifier is connected with an output terminal of the chlorine dioxide gas sensor probe, and a first phase compensation network is connected between the negative input terminal and the output terminal of the first operational amplifier, and generally the first phase compensation network is composed of a capacitor and a resistor connected in parallel with each other.
The chlorine dioxide gas sensor outputs a current signal which is weak, so that the transimpedance operational amplifier circuit can convert an analog current signal acquired by the chlorine dioxide gas sensor into a voltage signal and perform preliminary amplification.
In this embodiment, the high gain amplifying circuit is mainly composed of an inverting amplifying circuit, and since the negative voltage signal is output by the transimpedance operational amplifier circuit, the inverting amplifying circuit is used for amplifying the negative voltage signal into a positive voltage signal, the inverting amplifying circuit mainly includes a second operational amplifier, the positive input end of the second operational amplifier inputs a second bias voltage, the negative input end of the second operational amplifier is connected with the output end of the current-voltage converting circuit (transimpedance operational amplifier circuit), and a second phase compensation network is connected between the negative input end and the output end of the second operational amplifier, where the second phase compensation network is generally composed of a capacitor.
As a preferred technical solution, in an improved implementation manner of the present embodiment, a gain switching circuit is further connected between the negative input end and the output end of the second operational amplifier, and is used for switching the amplification factor of the high-gain amplifying circuit.
Specifically, the gain switching circuit may be composed of a single-pole double-throw switch, a first gain switching resistor and a second gain switching resistor, wherein an input end of the single-pole double-throw switch is connected with a negative input end of the second operational amplifier, two output ends of the single-pole double-throw switch are respectively connected with one end of the first gain switching resistor and one end of the second gain switching resistor, and the other end of the first gain switching resistor and the other end of the second gain switching resistor are both connected with an output end of the second operational amplifier.
In this embodiment, the low-pass filter circuit includes a third operational amplifier, a positive input terminal of the third operational amplifier is connected to an output terminal of the high-gain amplifying circuit, a positive voltage is input to a negative input terminal of the third operational amplifier, and a first resistor and a first capacitor are connected in parallel between the negative input terminal and the output terminal of the third operational amplifier.
In this embodiment, a microcontroller chip and a power management circuit are disposed on a digital circuit PCB, the microcontroller chip is connected to an output end of the low-pass filter, and the power management circuit is configured to provide power for each component in the chlorine dioxide gas sensor hybrid integrated circuit.
Example 2
Example 2 the technical solution of the present invention is further illustrated by a schematic diagram of specific circuit connections of a chlorine dioxide gas sensor hybrid integrated circuit in a sterilizer application.
The embodiment discloses a chlorine dioxide gas sensor hybrid integrated circuit includes an analog circuit PCB circuit board and a digital circuit PCB circuit board, wherein the analog circuit PCB circuit board and the digital circuit PCB circuit board are connected together by adopting a double-layer aliasing structure.
As shown in fig. 3, the analog circuit PCB mainly includes a probe matching circuit connected with the chlorine dioxide gas sensor probe Sr1, and the probe matching circuit includes a current-voltage conversion circuit, a high gain amplification circuit, and a low pass filter circuit connected in sequence. In this embodiment, the sensor probe Sr1 is a sensor probe of holmivir, which has the characteristics of small volume, high measurement sensitivity, and the like.
As shown in fig. 3, the R end of the sensor probe Sr1 is connected with a bias circuit, the bias circuit includes an operational amplifier U1A, a resistor R1 is a bias resistor at the same phase end of the operational amplifier U1A, resistors R2 and R3 are bias resistors at the opposite phase end of the operational amplifier U1A, and meanwhile, the resistors R2, R3 and a capacitor C4 together form a phase compensation network to prevent the operational amplifier U1A from generating self-oscillation.
The current-voltage conversion circuit is constituted by an operational amplifier U1B (first operational amplifier), and the operational amplifier U1B forms a transimpedance operational amplifier circuit. The current-voltage conversion circuit converts the current signal output by the W end of the sensor probe Sr1 into a voltage signal, the amplification factor of the operational amplifier U1B in this embodiment is 100K, the resistors R6 and R16 form a negative feedback loop and determine the amplification factor of the operational amplifier, and the resistor R16 and the capacitor C9 form a phase compensation network.
The chlorine dioxide gas sensor can be equivalent to a current source, and theoretically, the output resistance of the chlorine dioxide gas sensor is equal to the input resistance of an amplifier, so that power matching can be realized, and the signal output with the maximum power can be obtained. In practical application, the output resistance of the chlorine dioxide gas sensor is measured first, and then the matching design of the amplifier is carried out. Therefore, the input resistor of the amplifier must be accurately matched to effectively reduce the noise figure. And the current-voltage conversion circuit is used for realizing resistance matching, reducing noise coefficient and further improving signal-to-noise ratio. This creates advantages for high precision amplifiers. The current-voltage conversion circuit in the scheme must follow the basic principle of impedance matching, and the equivalent circuit of the chlorine dioxide gas sensor is a current source, so that the internal resistance of the chlorine dioxide gas sensor can be measured. The current-voltage conversion circuit is realized by a standard operational amplifier, and the input resistance of the ideal operational amplifier is infinite, so that the resistance connected with the input end of the operational amplifier can be matched according to the equivalent output resistance of the chlorine dioxide gas sensor. In particular in fig. 3, the parallel resistance of R6 and R16 should be equal to the equivalent output resistance of the chlorine dioxide gas sensor.
The high gain amplifying circuit is composed of an operational amplifier U2A (second operational amplifier), and in this embodiment, the high gain amplifying circuit adopts an inverting amplifying circuit, so as to perform inverting amplification on the output signal of the operational amplifier U1B. Resistor R8 is the operational amplifier U2A virtual ground bias and level shift circuit, and resistors R18 and R19 are the amplification factor switching resistors. The capacitors C6 and C11 form a phase compensation network.
As the preferred high gain amplification circuit, the amplification factor is switchable, in this embodiment, the switchable amplification factor is 40 times or 4 times, respectively, for range switching. The gain switching circuit can be composed of a single-pole double-throw switch JK2B, a first gain switching resistor R18 and a second gain switching resistor R19, wherein the input end of the single-pole double-throw switch JK2B is connected with the negative input end of the operational amplifier U1B, the two output ends of the single-pole double-throw switch JK2B are respectively connected with one end of the first gain switching resistor R18 and one end of the second gain switching resistor R19, and the other end of the first gain switching resistor R18 and the other end of the second gain switching resistor R19 are both connected with the output end of the operational amplifier U2A
Resistors R18 and R19 are redundant resistors of the amplifier and also serve to condition the output signal of the operational amplifier U2A. In a specific application, the resistor R18 and the resistor R19 can also adopt a combined resistor formed by connecting a plurality of resistors in parallel, and similarly, the capacitor C11 is also formed by connecting a plurality of capacitors in parallel to form a combined capacitor. This combined resistance-capacitance design is an effective way of redundancy design.
The low-pass filter circuit is mainly composed of an operational amplifier U2B (third operational amplifier), and in this embodiment, the operational amplifier U2B, resistors R11, R12, R13, and capacitors C7, C8 constitute a butterworth low-pass filter with a cut-off bandwidth of 10Hz.
The low-pass filter circuit adopts a Butterworth filter circuit structure, ensures flatness in a passband and has steeper cut-off bandwidth, various interference noises outside the passband are filtered by the low-pass filter, the signal-to-noise ratio of the high-gain amplifier is improved, and the stability of the high-gain amplifier is maintained. For chlorine dioxide sensor signals, the signals are generally low-pass signals which change slowly, so that the narrow-band low-pass filter can effectively filter noise interference, and high-gain amplification is realized.
In the embodiment, the operational amplifier in the probe matching circuit can be an AD8629ARZ precise dual-operational amplifier, and each part of the probe matching circuit is powered by a unipolar power supply, so that the circuit structure is simplified. The probe matching circuit has compact and reliable design and is mutually related, and all functions of impedance transformation and matching, level transfer, high-gain amplification, low-pass filtering and the like are completed in a combined way. Meanwhile, the probe matching circuit is further added with a phase compensation network, a redundant resistor and the like, so that the stability and reliability of the circuit are ensured. Perfectly realizes the circuit matching of the chlorine dioxide gas sensor probe and lays a foundation for the miniaturization of the chlorine dioxide gas sensor hybrid integrated circuit.
The analog circuit PCB is also provided with a relay circuit module which mainly comprises a relay JK2A, JK A and a relay JK3A, and the relay module is connected with a microcontroller chip on the digital circuit PCB. The relay JK3A is used for controlling the power on-off of each operational amplifier of the analog circuit PCB module, the relay JK2A is used for controlling the multiplying power switching of the high-gain amplifying circuit, and the relay JK1A is used for controlling the short circuit between the reference electrode and the working electrode of the chlorine dioxide gas sensor probe in a non-working state so as to reduce the negative feedback adjustment time in the initial stage of power-on. Specifically, the contact of the relay JK1A is closed at the moment of electrification, the reference electrode W and the working electrode R of the chlorine dioxide gas sensor probe Sr1 are short-circuited, namely, the reference electrode W and the working electrode R are subjected to initialization calibration, so that the negative feedback adjustment time is shortened, and the sensor probe Sr1 is enabled to enter a normal working state rapidly. In fig. 3, for simplicity of circuit diagram connection, no related connection is drawn by adopting a labeling method. This is a common method of circuit diagram fabrication.
The digital circuit PCB is provided with a microcontroller chip and a power management circuit, as shown in fig. 4, V1, V2 and U1 are power management circuits, and the functions of the power management circuits are to provide power for the whole machine and the chlorine dioxide gas sensor hybrid integrated circuit. The V1 uses a linear power chip L78M05 to lower the bus to 5V to supply power to the analog circuit PCB, and the V2 uses an AMS1117-3.3 chip to lower the bus to 3.3V to supply power to the digital circuit PCB; the U1 is used for providing power for the probe matching circuit, specifically adopts an ADR03 voltage reference chip to provide +2.5V virtual ground level required in the probe matching circuit, and provides correction reference voltage for the ADC peripheral of the micro-controller chip.
U2 is the microcontroller chip of the whole machine, wherein, chlorine dioxide gas sensor probe and its matching amplifying circuit on the analog circuit PCB circuit board are mainly used for gathering chlorine dioxide concentration signal, input to the microcontroller unit after filtering, amplifying and normalizing. The microcontroller unit judges according to a preset reference, and finally outputs a control signal to control the generation of chlorine dioxide gas. The specific implementation devices are various relay units. The microcontroller chip adopts STM32F405RGT6 chip, and STM32F405RGT6 chip still possesses functions such as information input and demonstration, and STM32F405RGT6 chip provides three serial ports and communicates with host computer, main control board and external display screen respectively. Other accessory parts such as wire harnesses, RESET buttons RESET, connectors, etc. can be flexibly designed as part of the overall machine.
Through the circuit analysis, the invention researches and processes the technical difficulties mentioned in the technical background. This solution is monolithic, irrespective of a single device or unit circuit. In order to improve the resolution of the chlorine dioxide gas sensor, the invention solves the problem through a specific circuit structure. I.e. to increase the gain of the subsequent matching circuit, but high gain amplifiers do not bring about a high signal to noise ratio and at the same time the stability of the system is deteriorated. The method comprises the steps of carrying out impedance matching on the chlorine dioxide gas sensor probe to ensure that the sensor probe outputs a maximum power signal, thereby improving the signal-to-noise ratio. The high gain amplifier further amplifies the signal, in order to inhibit noise and improve signal to noise ratio, a narrow band low pass filter is added in the system, so that the performance of the whole matching circuit meets the requirement of improving the resolution of the chlorine dioxide gas sensor.
The invention adopts an aliasing technology, and finally realizes the miniaturization and functionalization of the chlorine dioxide gas sensor hybrid integrated circuit. The innovative technology well solves the ubiquitous technical problem in the field of chlorine dioxide disinfectors, and has good reference and reference significance for other similar applications.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A chlorine dioxide gas sensor hybrid integrated circuit, comprising:
the circuit comprises an analog circuit PCB circuit board and a digital circuit PCB circuit board, wherein the analog circuit PCB circuit board and the digital circuit PCB circuit board are connected together by adopting a double-layer aliasing structure;
the simulation circuit PCB is used for receiving and processing the simulation signals acquired by the chlorine dioxide gas sensor probe; the analog circuit PCB circuit board is provided with a probe matching circuit connected with the chlorine dioxide gas sensor probe, and the probe matching circuit comprises a current-voltage conversion circuit, a high-gain amplifying circuit and a low-pass filter circuit which are connected in sequence; the current-voltage conversion circuit comprises a transimpedance operational amplifier circuit, the transimpedance operational amplifier circuit comprises a first operational amplifier, a positive input end of the first operational amplifier inputs a first bias voltage, a negative input end of the first operational amplifier is connected with an output end of a chlorine dioxide gas sensor probe, and a first phase compensation network is connected between the negative input end and the output end of the first operational amplifier;
the digital circuit PCB is used for receiving the analog signals processed by the analog circuit PCB and converting the analog signals into digital signals for processing.
2. The chlorine dioxide gas sensor hybrid integrated circuit of claim 1, wherein the high gain amplification circuit comprises an inverting amplification circuit comprising a second operational amplifier, a positive input of the second operational amplifier inputs a second bias voltage, a negative input of the second operational amplifier is connected to the output of the current to voltage conversion circuit, and a second phase compensation network is connected between the negative input and the output of the second operational amplifier.
3. The chlorine dioxide gas sensor hybrid integrated circuit of claim 2, wherein a gain switching circuit is further connected between the negative input and the output of the second operational amplifier.
4. The chlorine dioxide gas sensor hybrid integrated circuit of claim 3, wherein the gain switching circuit comprises a single pole double throw switch, a first gain switching resistor and a second gain switching resistor, wherein the input end of the single pole double throw switch is connected with the negative input end of the second operational amplifier, the two output ends of the single pole double throw switch are respectively connected with one end of the first gain switching resistor and one end of the second gain switching resistor, and the other end of the first gain switching resistor and the other end of the second gain switching resistor are both connected with the output end of the second operational amplifier.
5. The chlorine dioxide gas sensor hybrid integrated circuit of claim 1, wherein the low pass filter circuit comprises a third operational amplifier, a positive input of the third operational amplifier is connected with an output of the high gain amplification circuit, a negative input of the third operational amplifier inputs a positive voltage, and a first resistor and a first capacitor are connected in parallel between the negative input and the output of the third operational amplifier.
6. The chlorine dioxide gas sensor hybrid integrated circuit of claim 1, wherein the digital circuit PCB is provided with a microcontroller chip and a power management circuit, the microcontroller chip is connected to the output of the low pass filter, and the power management circuit is configured to provide power to each component in the chlorine dioxide gas sensor hybrid integrated circuit 。
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