CN217590783U - Analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants and electronic equipment - Google Patents
Analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants and electronic equipment Download PDFInfo
- Publication number
- CN217590783U CN217590783U CN202220823093.8U CN202220823093U CN217590783U CN 217590783 U CN217590783 U CN 217590783U CN 202220823093 U CN202220823093 U CN 202220823093U CN 217590783 U CN217590783 U CN 217590783U
- Authority
- CN
- China
- Prior art keywords
- analog
- converter
- signal
- conversion circuit
- digital conversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
The utility model provides an analog-to-digital conversion circuit and electronic equipment that atmospheric gaseous pollutant detected belongs to the technical field that the pollutant detected, has solved and has need changed the signal after enlargiing, taking care of into the signal that is suitable for AD conversion to can fully remain the problem of effective information. The device comprises an analog signal switching selection matrix and an AD converter; the output end of the analog signal switching selection matrix is connected with the input end of the AD converter; selecting the analog signal by the analog signal switching selection matrix; and an AD converter for converting the analog signal into a digital signal. The utility model discloses the noise that makes the signal is showing and is reducing, obtains the AD value signal that bears useful information, can show validity and the real-time of improving signal-to-noise ratio and signal.
Description
Technical Field
The utility model belongs to the technical field of the pollutant detects technique and specifically relates to an analog-to-digital conversion circuit and electronic equipment that atmospheric gaseous pollutant detected.
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 a weak signal of nA (minus 9 th power of 10)). The nA level weak signal is easily submerged in circuit noise and needs to be amplified and conditioned, but the problem that the amplified and conditioned signal needs to be converted into a signal suitable for AD conversion and effective information can be fully reserved is followed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an analog-to-digital conversion circuit and electronic equipment that atmospheric gas state pollutant detected, solved and need change the signal after enlargiing, taking care of into the signal that is suitable for AD conversion to can fully remain the problem of effective information.
In a first aspect, the utility model provides an analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants, which comprises an analog signal switching selection matrix and an AD converter; the output end of the analog signal switching selection matrix is connected with the input end of the AD converter;
the analog signal switching selection matrix selects the analog signal;
the AD converter converts an analog signal into a digital signal.
Further, the AD converter comprises a filtering unit, an impedance matching unit and a converting unit; the filtering unit is connected with the impedance matching unit, and the impedance matching unit is connected with the conversion unit;
the filtering unit filters noise, the impedance matching unit adjusts load power and inhibits signal reflection, and the conversion unit converts the analog signal into a digital signal.
Further, the AD converter further includes a transmission unit, and the transmission unit provides the data generated by the AD conversion to the SPI master device and receives an instruction from the SPI master device.
Furthermore, the device also comprises an inter-circuit board connector, a memory, a reference voltage source and a power supply; the AD converter, the memory, the reference voltage source and the power supply are respectively connected with connectors between the circuit boards;
the connector between the circuit boards enables the digital circuit to carry out channel switching control on the analog signal switching selection matrix on the analog-digital conversion circuit;
a memory for storing various parameters;
the reference voltage source is used for providing reference voltage for the analog-digital conversion circuit and the AD converter;
and the power supply supplies power to the analog-digital conversion circuit.
Further, the AD converter is a 16-bit AD converter.
In a second aspect, the present invention further provides an electronic device including the analog-to-digital conversion circuit.
The utility model has the advantages of:
by arranging the filtering unit, the noise of the signal is obviously reduced, an AD value signal carrying useful information is obtained, and the signal-to-noise ratio and the effectiveness and the real-time performance of the signal can be obviously improved.
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 an analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants according to an embodiment of the present invention;
1. analog signal switching selection matrix; 2. an AD converter; 3. a memory; 4. an analog circuit reference voltage source; 5. the analog circuit supplies power; 6. a connector between circuit boards.
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 efforts all belong to the protection scope of the present invention.
The terms "comprising" and "having," and any variations thereof, as used in connection with 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 an analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants, including an analog signal switching selection matrix 1 and an AD converter 2; the output end of the analog signal switching selection matrix 1 is connected with the input end of the AD converter 2;
the analog signal switching selection matrix 1 selects analog signals;
the AD converter 2 converts the analog signal into a digital signal.
A series of numerical value sequences carrying analog signal information are obtained by carrying out 16-bit precision continuous and rapid AD conversion on the voltage signal output by the regulating circuit, and the numerical value sequences are called as original AD values. For an original AD value, firstly, a median filtering method is used for filtering, pulse noise interference caused by accidental factors is eliminated, and then a Kalman filtering method with high smoothness and good real-time performance is used for filtering the original AD value again. Through two-stage digital filtering processing, the noise of the original AD value is obviously reduced, and an AD value signal carrying useful information is obtained.
In one possible embodiment, the AD converter 2 includes a filtering unit, an impedance matching unit, and a converting unit;
the filtering unit filters noise, the impedance matching unit adjusts load power and inhibits signal reflection, and the conversion unit converts an analog signal into a digital signal.
In a possible embodiment, the AD converter 2 further includes a transmission unit that provides the data generated by the AD conversion to the SPI master device and accepts an instruction from the SPI master device.
The SPI (Serial Peripheral Interface), a Serial Peripheral Interface, is a high-speed, full-duplex, synchronous communication bus, and occupies only four wires on the pins of the chip, saving the pins of the chip, and simultaneously saving space on the layout of the PCB, providing convenience. The SPI master device can rapidly communicate with a plurality of slave devices with different configurations. Full duplex operation is supported; the operation is simple; the data transmission rate is high.
In a possible embodiment, the device further comprises an inter-circuit board connector 6, a memory 3, a reference voltage source 4 and a power supply 5; the AD converter 2, the memory 3, the reference voltage source 4 and the power supply 5 are respectively connected with a connector 6 between circuit boards;
the connector 5 between the circuit boards makes the digital circuit switch and select the matrix 1 to switch the signal channel on the analog-to-digital conversion circuit;
a memory 3 for storing various parameters;
a reference voltage source 4 for supplying a reference voltage to the analog-to-digital conversion circuit and the AD converter 2;
and the power supply 5 supplies power to the analog-digital conversion 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.
In one possible embodiment, the AD converter 2 is a 16-bit AD converter.
The 16-bit high-precision AD converter converts the electric signals into numerical values ranging from 0 to 65535, is a slave device on the SPI bus, is controlled by the SPI master device and provides analog circuit power supply data generated through AD conversion for the master device.
Example two:
the embodiment of the invention also provides electronic equipment which comprises the analog-to-digital conversion 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 or 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 directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element indicated must have a specific direction, be constructed and operated in a specific direction, 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, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 as a specific case by 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 the flowcharts and block diagrams in the figures, for example, 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 position, or may be distributed on multiple 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. An analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants is characterized by comprising an analog signal switching selection matrix (1) and an AD converter (2); the output end of the analog signal switching selection matrix (1) is connected with the input end of the AD converter (2);
the analog signal switching selection matrix (1) selects analog signals;
the AD converter (2) converts an analog signal into a digital signal.
2. The atmospheric gaseous pollutant detection analog-to-digital conversion circuit of claim 1, characterized in that, the AD converter (2) comprises a filtering unit, an impedance matching unit and a conversion unit; the filtering unit is connected with the impedance matching unit, and the impedance matching unit is connected with the conversion unit;
the filtering unit filters noise, the impedance matching unit adjusts load power and inhibits signal reflection, and the conversion unit converts the analog signal into a digital signal.
3. The atmospheric gaseous pollutant detection analog-to-digital conversion circuit according to claim 1, characterized in that the AD converter (2) further comprises a transmission unit, and the transmission unit provides data generated by AD conversion to the SPI master device and receives an instruction of the SPI master device.
4. The atmospheric gaseous pollutant detection analog-to-digital conversion circuit of claim 1, characterized by further comprising an inter-circuit board connector (6), a memory (3), a reference voltage source (4) and a power supply (5); the AD converter (2), the memory (3), the reference voltage source (4) and the power supply (5) are respectively connected with a connector (6) between the circuit boards;
the connector (6) between the circuit boards makes the digital circuit switch the selection matrix (1) to carry on the channel switching control to the analog signal on the analog-to-digital conversion circuit;
a memory (3) for storing various parameters;
a reference voltage source (4) for providing a reference voltage for the analog-to-digital conversion circuit and the AD converter (2);
and the power supply (5) supplies power to the analog-digital conversion circuit.
5. Analog-to-digital conversion circuit for atmospheric gaseous pollutant detection according to claim 1, characterized in that said AD converter (2) is a 16-bit AD converter.
6. An electronic device characterized by comprising the analog-to-digital conversion circuit of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220823093.8U CN217590783U (en) | 2022-04-11 | 2022-04-11 | Analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220823093.8U CN217590783U (en) | 2022-04-11 | 2022-04-11 | Analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217590783U true CN217590783U (en) | 2022-10-14 |
Family
ID=83541802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220823093.8U Active CN217590783U (en) | 2022-04-11 | 2022-04-11 | Analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217590783U (en) |
-
2022
- 2022-04-11 CN CN202220823093.8U patent/CN217590783U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202794365U (en) | Automatic testing system for power distribution monitoring terminals | |
| CN201555511U (en) | Fault detection device for fire control system | |
| CN201233288Y (en) | Multipath data acquisition system | |
| CN217590783U (en) | Analog-to-digital conversion circuit for detecting atmospheric gaseous pollutants and electronic equipment | |
| CN106291321B (en) | L abWindows/CVI-based plasma power supply circuit automatic test platform and method | |
| CN112737626B (en) | Broadband parallel receiving and processing device based on VPX bus | |
| CN217846923U (en) | Multi-trigger mode data acquisition device | |
| CN207148198U (en) | A kind of electronic current mutual inductor based on current divider principle | |
| CN1940782A (en) | Method and arrangement for monitoring a transmission medium | |
| CN212623694U (en) | Portable multifunctional on-line comprehensive reading instrument | |
| CN214728848U (en) | EMUs bogie integrated safety monitoring system hardware platform | |
| CN112165162B (en) | Ground power supply control system of carrier rocket | |
| CN201163281Y (en) | Modularized multi-component distribution type on-line gas analyzer | |
| CN217116072U (en) | Signal conditioning circuit for detecting atmospheric gaseous pollutants and electronic equipment | |
| CN107465349A (en) | A kind of low noise power supply system suitable for stream type cell analyzer | |
| US20070244668A1 (en) | Measured-value acquisition device | |
| CN217112164U (en) | Atmospheric gaseous pollutant sensing circuit and electronic equipment | |
| CN113810789B (en) | Multi-parameter distributed intelligent sensing node for working condition of power equipment | |
| CN103529728A (en) | Battery management system with various security detection functions | |
| CN219147613U (en) | Multichannel electroencephalogram signal acquisition device | |
| KR100771916B1 (en) | Data aquisition method for digital protective relay | |
| CN216747880U (en) | Multi-path voltage identification and judgment control device with prompting and alarming functions | |
| CN213545520U (en) | Secondary equipment on-line monitoring and data filtering device | |
| CN202771188U (en) | Universal signal conditioning system | |
| CN213458413U (en) | Data acquisition terminal device for mechanical equipment on-line monitoring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |