CN217116072U - Signal conditioning circuit for detecting atmospheric gaseous pollutants and electronic equipment - Google Patents
Signal conditioning circuit for detecting atmospheric gaseous pollutants and electronic equipment Download PDFInfo
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- CN217116072U CN217116072U CN202220856205.XU CN202220856205U CN217116072U CN 217116072 U CN217116072 U CN 217116072U CN 202220856205 U CN202220856205 U CN 202220856205U CN 217116072 U CN217116072 U CN 217116072U
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Abstract
The utility model provides a signal conditioning circuit and electronic equipment that atmospheric gas state pollutant detected belongs to the technical field that the pollutant detected, and the SNR of having solved the signal after tentatively enlargiing is lower, the relatively poor problem of signal stability. The device comprises a signal input unit, a level adjusting unit, a self-adaptive gain adjusting unit and a low-pass filtering unit; the signal input unit is connected with the level adjusting unit, the level adjusting unit is connected with the self-adaptive gain adjusting unit, and the self-adaptive gain adjusting unit is connected with the low-pass filtering unit. The utility model discloses a carry out meticulous timing to the direct current operating point and the signal gain at different levels of circuit and obtained excellent signal gain, SNR and signal stability, provide the circuit guarantee for entire system's excellent performance.
Description
Technical Field
The utility model belongs to the technical field of the pollutant detects technique and specifically relates to a signal conditioning circuit and electronic equipment that atmospheric gaseous pollutant detected is related to.
Background
The gridding system adopts miniature air quality detection equipment, carries out large-range and high-density grid combination distribution aiming at various environment monitoring objects such as urban residential areas, rural towns, industrial parks, key industrial enterprises, road traffic, construction sites, regional boundaries, pollutant transmission channels and the like, combines three-dimensional monitoring and mobile monitoring to form an online monitoring grid covering the whole region, can monitor the dynamic change of main pollutants in the region in real time, quickly captures the abnormal emission behavior of a pollution source and carries out real-time early warning, can discriminate the main sources of regional pollution through data analysis, realizes targeted treatment on the main sources, and is a scientific and effective tool for atmospheric pollution treatment. However, for the application scenario of atmospheric gaseous pollutant detection, the volume concentration of the detected gas is usually ppb (part per billion), and at such a very low concentration, the response current signal of the sensor is nA (minus 9 th power of 10)) level weak signal. The nA level weak signal is easily submerged in the circuit noise, after the sensing circuit primarily amplifies the electric signal, the signal-to-noise ratio of the signal is low, and the signal stability is poor, so a signal conditioning circuit is needed to be designed to finely adjust the signal.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a signal conditioning circuit and electronic equipment that atmospheric gas state pollutant detected, it is lower to have solved the SNR of the signal after preliminary amplification, the relatively poor problem of signal stability.
In a first aspect, the utility model provides a signal conditioning circuit for detecting atmospheric gaseous pollutants, which comprises a signal input unit, a level adjusting unit, a self-adaptive gain adjusting unit and a low-pass filtering unit; the signal input unit is connected with the level adjusting unit, the level adjusting unit is connected with the self-adaptive gain adjusting unit, and the self-adaptive gain adjusting unit is connected with the low-pass filtering unit;
the signal input unit inputs signals, the level adjusting unit enables the signal zero level to adapt to the requirements of the whole dynamic range of the signals, the self-adaptive gain adjusting unit enables the circuit gain to dynamically adapt to the amplitude of the input signals and the dynamic range of the circuit at the current stage, and the low-pass filtering unit filters out noise higher than the signal frequency.
Further, the signal input unit is connected with the level adjusting unit in a direct coupling mode.
Furthermore, the signal input unit, the level adjusting unit, the adaptive gain adjusting unit and the low-pass filtering units are all provided in plurality, and each low-pass filtering unit transmits the signal to the analog-to-digital conversion circuit in a direct coupling mode.
Further, the low-pass filtering unit is an active filter.
Furthermore, the device also comprises an inter-circuit board connector, a memory, a power supply and a reference voltage source; the analog-to-digital conversion circuit, the memory, the power supply and the reference voltage source are respectively connected with the connectors between the circuit boards;
the connector between the circuit boards is used for connecting the power supply between the circuit boards and completing communication;
a memory for storing various parameters;
the power supply supplies power to the circuit;
and the reference voltage source is used for providing reference voltage for the circuit.
In a second aspect, the present invention further provides an electronic device including the signal conditioning circuit.
The utility model has the advantages that:
through the arrangement of the level adjusting unit, the self-adaptive gain adjusting unit and the low-pass filtering unit, the direct-current working points and the signal gains of all stages of the circuit are finely adjusted, so that excellent signal gain, signal-to-noise ratio and signal stability are obtained, and circuit guarantee is provided for the excellent performance of the whole system. The signal is stable, the response is reliable, and the weather resistance is strong.
Correspondingly, the embodiment of the utility model provides an electronic equipment also has above-mentioned technological effect.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are 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 structural diagram of a signal conditioning circuit for detecting atmospheric gaseous pollutants according to an embodiment of the present invention;
1. a signal input unit; 2. a level adjustment unit; 3. an adaptive gain adjustment unit; 4. and a low-pass filtering unit.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are 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 "comprising" and "having," and any variations thereof, as referred to in the embodiments of the present invention, are intended to cover non-exclusive inclusions. 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 but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a signal conditioning circuit for detecting atmospheric gaseous pollutants, including a signal input unit 1, a level adjustment unit 2, an adaptive gain adjustment unit 3, and a low-pass filtering unit 4; the signal input unit 1 is connected with the level adjusting unit 2, the level adjusting unit 2 is connected with the adaptive gain adjusting unit 3, and the adaptive gain adjusting unit 3 is connected with the low-pass filtering unit 4;
the signal input unit 1 inputs signals, the level adjusting unit 2 enables the signal zero level to adapt to the requirements of the whole dynamic range of the signals, the self-adaptive gain adjusting unit 3 enables the circuit gain to dynamically adapt to the amplitude of the input signals and the dynamic range of the circuit at the current stage, and the low-pass filtering unit 4 filters out noise higher than the signal frequency.
The direct current working points and the signal gains of all stages of the circuit are finely adjusted, so that excellent signal gain, signal-to-noise ratio and signal stability are obtained, and circuit guarantee is provided for the excellent performance of the whole system.
In one possible embodiment, the signal input unit 1 and the level adjustment unit 2 are connected by direct coupling.
The direct coupling mode has good low-frequency characteristics and amplifies signals with slow change.
In one possible embodiment, the signal input unit 1, the level adjustment unit 2, the adaptive gain adjustment unit 3, and the low-pass filter unit 4 are provided in plurality, and each low-pass filter unit 4 transmits a signal to the analog-to-digital conversion circuit by direct coupling.
The direct coupling mode has good low-frequency characteristics and amplifies signals with slow change.
In a possible implementation, the low-pass filtering unit 4 is an active filter, and can dynamically filter out each harmonic, and can completely absorb the harmonic in the system; no resonance is generated.
In a possible implementation mode, the device further comprises an inter-circuit board connector, a memory, a power supply source and a reference voltage source; the analog-to-digital conversion circuit, the memory, the power supply and the reference voltage source are respectively connected with the connectors between the circuit boards;
the connector between the circuit boards is used for connecting the power supply between the circuit boards and completing communication;
a memory for storing various parameters;
the power supply supplies power to the circuit;
and the reference voltage source is used for providing reference voltage for the circuit.
The power supply is specially designed for the micro-signal acquisition application scene and has extremely low noise and stability; the reference voltage source has extremely high voltage precision, extremely low noise and extremely low temperature drift; the memory is used for storing calibration parameters, compensation parameters, correction parameters and other module setting parameters of each sensor, and has the characteristics of no loss of power failure data, long data storage time and multiple erasable times.
Example two:
the embodiment of the invention also provides electronic equipment which comprises the signal conditioning circuit for detecting the atmospheric gaseous pollutants.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The device provided by the embodiment of the invention can be specific hardware on equipment or software or firmware installed on the equipment and the like. The embodiment of the present invention provides an apparatus, which has the same technical effects as the aforementioned method embodiment, and for the sake of brief description, the embodiment of the apparatus is not mentioned, and reference can be made to the corresponding contents in the aforementioned method embodiment. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
For another example, the division of the unit is only one division of logical functions, and there may be other divisions in actual implementation, and for another example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features, within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention. Are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A signal conditioning circuit for detecting atmospheric gaseous pollutants is characterized by comprising a signal input unit (1), a level adjusting unit (2), a self-adaptive gain adjusting unit (3) and a low-pass filtering unit (4); the signal input unit (1) is connected with the level adjusting unit (2), the level adjusting unit (2) is connected with the self-adaptive gain adjusting unit (3), and the self-adaptive gain adjusting unit (3) is connected with the low-pass filtering unit (4);
the signal input unit (1) inputs signals, the level adjusting unit (2) enables the signal zero level to adapt to the requirements of the whole dynamic range of the signals, the self-adaptive gain adjusting unit (3) enables the circuit gain to dynamically adapt to the input signal amplitude and the dynamic range of the circuit at the current stage, and the low-pass filtering unit (4) filters out noise higher than the signal frequency.
2. The atmospheric gaseous pollutant detection signal conditioning circuit of claim 1, characterized in that, the signal input unit (1) and the level adjustment unit (2) are connected by direct coupling.
3. The atmospheric gaseous pollutant detection signal conditioning circuit of claim 1, characterized in that, the signal input unit (1), the level adjustment unit (2), the adaptive gain adjustment unit (3) and the low pass filter unit (4) are all provided with a plurality, and each low pass filter unit (4) transmits the signal to the analog-to-digital conversion circuit by direct coupling.
4. The atmospheric gaseous pollutant detection signal conditioning circuit of claim 1, characterized in that said low-pass filtering unit (4) is an active filter.
5. The atmospheric gaseous pollutant detection signal conditioning circuit of claim 3, further comprising an inter-circuit board connector, a memory, a power supply and a reference voltage source; the analog-to-digital conversion circuit, the memory, the power supply and the reference voltage source are respectively connected with the connectors between the circuit boards;
the connector between the circuit boards is used for connecting the power supply between the circuit boards and completing communication;
a memory for storing various parameters;
the power supply supplies power to the circuit;
and the reference voltage source is used for providing reference voltage for the circuit.
6. An electronic device comprising a signal conditioning circuit as claimed in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220856205.XU CN217116072U (en) | 2022-04-13 | 2022-04-13 | Signal conditioning circuit for detecting atmospheric gaseous pollutants and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220856205.XU CN217116072U (en) | 2022-04-13 | 2022-04-13 | Signal conditioning circuit for detecting atmospheric gaseous pollutants and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217116072U true CN217116072U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220856205.XU Active CN217116072U (en) | 2022-04-13 | 2022-04-13 | Signal conditioning circuit for detecting atmospheric gaseous pollutants and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN217116072U (en) |
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- 2022-04-13 CN CN202220856205.XU patent/CN217116072U/en active Active
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