CN112362955A - ADC (analog to digital converter) acquisition method, device and equipment based on self calibration and storage medium - Google Patents
ADC (analog to digital converter) acquisition method, device and equipment based on self calibration and storage medium Download PDFInfo
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Abstract
The invention discloses an ADC (analog to digital converter) acquisition method, device, equipment and storage medium based on self calibration, wherein when a calibration instruction is received, a first voltage acquisition channel and a second voltage acquisition channel are respectively polled to obtain a first channel voltage and a second channel voltage; calculating an amplification factor and an offset of the basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset; polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through a calibration linear function. According to the invention, the amplification factor and the offset of the basic linear function are calculated according to the first channel voltage and the second channel voltage, the calibration linear function is obtained according to the amplification factor and the offset, the calibration input voltage corresponding to the input voltage acquired by the voltage acquisition channel to be calibrated is calculated through the calibration linear function, the acquisition of high-precision signals is realized through low-precision components, and the acquisition precision of an ADC system is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a storage medium for acquiring an ADC (Analog-to-Digital Converter) based on self calibration.
Background
In the field of power environment monitoring, a monitoring system needs to monitor analog information quantities of multiple channels of equipment such as voltage, current, temperature and humidity so as to assist in analyzing the current running state of the equipment, perform early warning on abnormal events and guarantee the stable running of monitored facilities. Currently, a device with a higher precision grade is generally adopted to ensure that a system acquisition error meets a demand index. However, the scheme is adopted to guarantee the system acquisition error, and the requirement on the precision of the adopted components is high, so that the increase of the system cost is inevitably brought, and the acquisition precision of the ADC system is not favorably improved.
Disclosure of Invention
The invention mainly aims to provide an ADC (analog to digital converter) acquisition method, device, equipment and storage medium based on self-calibration, aiming at solving the technical problems that the current scheme for ensuring the accuracy index of an ADC acquisition system is not beneficial to improving the acquisition accuracy of the ADC system.
In order to achieve the above object, an embodiment of the present invention provides an ADC acquisition method based on self calibration, where the ADC acquisition method based on self calibration includes:
when a calibration instruction is received, polling a first voltage acquisition channel and a second voltage acquisition channel respectively to obtain a first channel voltage and a second channel voltage;
calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset;
polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function.
Preferably, the step of calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage comprises:
acquiring a basic linear function, and generating a first function based on the basic linear function, the first channel voltage and a first standard channel voltage;
generating a second function based on the basic linear function, the second channel voltage and a second standard channel voltage;
and calculating the amplification factor and the offset of the basic linear function according to the first function and the second function.
Preferably, the step of calculating the amplification factor and the offset of the basic linear function according to the first function and the second function includes:
integrating the first function and the second function into an equation set;
and solving the equation set to obtain the amplification factor and the offset of the basic linear function.
Preferably, the step of polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function includes:
calling an analog switch, and respectively polling a plurality of voltage acquisition channels to be calibrated in the analog switch through the analog switch to obtain a plurality of analog voltage values;
converting the plurality of analog voltage values into a plurality of corresponding input voltage values by an amplifier and an AD converter;
and respectively inputting the plurality of input voltage values into the calibration linear function, and calculating to obtain a plurality of calibration input voltage values corresponding to the plurality of input voltage values.
Preferably, before the step of calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage, the method further includes:
comparing the first channel voltage and the second channel voltage with a preset threshold value respectively, and determining whether an abnormal input voltage exists in the first channel voltage and the second channel voltage;
if any one of the first channel voltage and the second channel voltage is greater than or equal to the preset threshold, judging that an abnormal input voltage exists, and outputting abnormal prompt information;
and if the first channel voltage and the second channel voltage are both smaller than the preset threshold value, judging that the system is normal.
Preferably, before the step of polling the first voltage acquisition channel and the second voltage acquisition channel respectively to obtain the first channel voltage and the second channel voltage, the method further includes:
detecting whether the current moment is a calibration moment or whether a temperature change value in a preset time is greater than a preset temperature threshold value in real time;
if the current time is the calibration time or the temperature change value in the preset time is greater than the preset temperature threshold, judging that the condition of entering a calibration mode is reached, and generating a calibration instruction;
and if the current time is not the calibration time or the temperature change value in the preset time is smaller than the preset temperature threshold value, judging that the condition of entering the calibration mode is not met.
Preferably, the step of determining a calibration linear function according to the amplification factor and the offset comprises:
adding the amplification factor and the offset to the base linear function;
and correcting the basic linear function through the amplification factor and the offset to obtain a calibration linear function.
In order to achieve the above object, the present invention further provides an ADC acquisition device based on self calibration, including:
the polling module is used for respectively polling the first voltage acquisition channel and the second voltage acquisition channel when a calibration instruction is received to obtain a first channel voltage and a second channel voltage;
the determining module is used for calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset;
and the calculation module is used for polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function.
Further, to achieve the above object, the present invention also provides a self-calibration-based ADC acquisition device, which includes a memory, a processor, and a self-calibration-based ADC acquisition program stored in the memory and executable on the processor, wherein the self-calibration-based ADC acquisition program implements the steps of the self-calibration-based ADC acquisition method when executed by the processor.
Further, to achieve the above object, the present invention also provides a storage medium, where an ADC acquisition program based on self-calibration is stored, and when being executed by a processor, the ADC acquisition program based on self-calibration implements the steps of the ADC acquisition method based on self-calibration.
The embodiment of the invention provides an ADC (analog to digital converter) acquisition method, device, equipment and storage medium based on self calibration, wherein when a calibration instruction is received, a first voltage acquisition channel and a second voltage acquisition channel are respectively polled to obtain a first channel voltage and a second channel voltage; calculating an amplification factor and an offset of the basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset; polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through a calibration linear function. According to the invention, under the condition of not adopting high-precision components, firstly, the amplification factor and the offset of the basic linear function are calculated according to the first channel voltage and the second channel voltage, then, the calibration linear function is obtained according to the amplification factor and the offset, and the calibration input voltage corresponding to the input voltage acquired by the voltage acquisition channel to be calibrated is calculated through the calibration linear function, so that the acquisition of high-precision signals is realized, and the acquisition precision of an ADC system is improved.
Drawings
FIG. 1 is a schematic structural diagram of a hardware operating environment related to an embodiment of an ADC acquisition method based on self-calibration according to the present invention;
FIG. 2 is a schematic flow chart of a self-calibration based ADC acquisition method according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart of a self-calibration based ADC acquisition method according to a second embodiment of the present invention;
fig. 4 is a functional block diagram of a preferred embodiment of the ADC acquisition device based on self-calibration according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides an ADC (analog to digital converter) acquisition method, device, equipment and storage medium based on self calibration, wherein when a calibration instruction is received, a first voltage acquisition channel and a second voltage acquisition channel are respectively polled to obtain a first channel voltage and a second channel voltage; calculating an amplification factor and an offset of the basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset; polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through a calibration linear function. According to the invention, under the condition of not adopting high-precision components, firstly, the amplification factor and the offset of the basic linear function are calculated according to the first channel voltage and the second channel voltage, then, the calibration linear function is obtained according to the amplification factor and the offset, and the calibration input voltage corresponding to the input voltage acquired by the voltage acquisition channel to be calibrated is calculated through the calibration linear function, so that the acquisition of high-precision signals is realized, and the acquisition precision of an ADC system is improved.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an ADC acquisition device based on self calibration in a hardware operating environment according to an embodiment of the present invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
The ADC acquisition equipment based on self-calibration in the embodiment of the invention can be a PC, and can also be mobile terminal equipment such as a tablet computer and a portable computer.
As shown in fig. 1, the ADC acquisition device based on self calibration may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the self-calibration based ADC acquisition device shown in fig. 1 does not constitute a limitation of the self-calibration based ADC acquisition device, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and an ADC acquisition program based on self-calibration.
In the device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the self-calibration based ADC acquisition program stored in the memory 1005, and perform the following operations:
when a calibration instruction is received, polling a first voltage acquisition channel and a second voltage acquisition channel respectively to obtain a first channel voltage and a second channel voltage;
calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset;
polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function.
Further, the step of calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage comprises:
acquiring a basic linear function, and generating a first function based on the basic linear function, the first channel voltage and a first standard channel voltage;
generating a second function based on the basic linear function, the second channel voltage and a second standard channel voltage;
and calculating the amplification factor and the offset of the basic linear function according to the first function and the second function.
Further, the step of calculating the amplification factor and the offset of the basic linear function according to the first function and the second function includes:
integrating the first function and the second function into an equation set;
and solving the equation set to obtain the amplification factor and the offset of the basic linear function.
Further, the polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function includes:
calling an analog switch, and respectively polling a plurality of voltage acquisition channels to be calibrated in the analog switch through the analog switch to obtain a plurality of analog voltage values;
converting the plurality of analog voltage values into a plurality of corresponding input voltage values by an amplifier and an AD converter;
and respectively inputting the plurality of input voltage values into the calibration linear function, and calculating to obtain a plurality of calibration input voltage values corresponding to the plurality of input voltage values.
Further, before the step of calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage, the processor 1001 may be configured to call an ADC acquisition program stored in the memory 1005 and based on self calibration, and perform the following operations:
comparing the first channel voltage and the second channel voltage with a preset threshold value respectively, and determining whether an abnormal input voltage exists in the first channel voltage and the second channel voltage;
if any one of the first channel voltage and the second channel voltage is greater than or equal to the preset threshold, judging that an abnormal input voltage exists, and outputting abnormal prompt information;
and if the first channel voltage and the second channel voltage are both smaller than the preset threshold value, judging that the system is normal.
Further, before the step of polling the first voltage acquisition channel and the second voltage acquisition channel respectively to obtain the first channel voltage and the second channel voltage, the processor 1001 may be configured to call an ADC acquisition program based on self calibration stored in the memory 1005, and perform the following operations:
detecting whether the current moment is a calibration moment or whether a temperature change value in a preset time is greater than a preset temperature threshold value in real time;
if the current time is the calibration time or the temperature change value in the preset time is greater than the preset temperature threshold, judging that the condition of entering a calibration mode is reached, and generating a calibration instruction;
and if the current time is not the calibration time or the temperature change value in the preset time is smaller than the preset temperature threshold value, judging that the condition of entering the calibration mode is not met.
Further, the step of determining a calibration linear function according to the amplification factor and the offset includes:
adding the amplification factor and the offset to the base linear function;
and correcting the basic linear function through the amplification factor and the offset to obtain a calibration linear function.
For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 2, a first embodiment of the present invention provides a schematic flow chart of an ADC acquisition method based on self-calibration. In this embodiment, the ADC acquisition method based on self calibration includes the following steps:
step S10, when a calibration instruction is received, polling a first voltage acquisition channel and a second voltage acquisition channel respectively to obtain a first channel voltage and a second channel voltage;
in this embodiment, the ADC collecting method based on self calibration is applied to an ADC collecting system based on self calibration, where the system at least includes an ADC collecting module and an information detecting module, the ADC collecting module includes an analog switch, an amplifier, an AD converter, and a plurality of analog collecting channels, where the plurality of analog collecting channels include a first Voltage collecting channel, a second Voltage collecting channel, and a certain number of Voltage collecting channels to be calibrated, the plurality of analog collecting channels can be individually connected to the analog switch, an output end of the analog switch is connected to an input end of the amplifier, an output end of the amplifier is connected to an input end of the AD converter, the analog switch is configured to realize polling switching from all the analog collecting channels to the amplifier, in this embodiment, the analog switch can be respectively connected to a 0 level (GND) and a Vref (Voltage Reference) through the first Voltage collecting channel and the second Voltage collecting channel, reference voltage) level; the amplifier can amplify the voltage or power of the input signal, the AD converter is an electronic element which converts the analog signal into the digital signal, a channel which is connected with Vref level is also arranged in the AD converter, in order to save cost, the Vref of the AD converter and the Vref connected with the analog switch can be homologous, and the digit of the AD converter is n; the information detection module is used for detecting the time information recorded by the information detection module or detecting the current temperature of the ADC acquisition system through a temperature sensor arranged in the information detection module. The system is also provided with a voltage calibration algorithm program, and the basic linear function is subjected to offset correction through a voltage calibration algorithm to obtain a calibration linear function so as to improve the precision of the input voltage acquired by the system.
Further, when a calibration instruction sent by the information detection module is received, the system calls an analog switch in the ADC acquisition module, controls the analog switch to be connected with the first voltage acquisition channel, transmits an analog reference voltage signal acquired from the first voltage acquisition channel to the amplifier and the AD converter, and converts the analog reference signal into a first channel voltage existing in a digital signal after the analog reference voltage signal is amplified by the amplifier and converted by the AD converter; and meanwhile, the analog switch is controlled to be connected with the second voltage acquisition channel, the analog grounding voltage acquired from the second voltage acquisition channel is transmitted to the amplifier and the AD converter, and after the amplification effect of the amplifier and the signal conversion of the AD converter, the analog grounding signal is converted into the second channel voltage existing in a digital signal.
Step S20, calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset;
further, after obtaining the first channel voltage and the second channel voltage, the system obtains a basic linear function such as: further, the system obtains a first standard channel voltage and a second standard channel voltage respectively corresponding to the first channel voltage and the second channel voltage, and obtains a first function and a second function by respectively substituting the first channel voltage and the first standard channel voltage into the basic linear function and substituting the second channel voltage and the second standard channel voltage into the basic linear function. Further, the system solves an equation system consisting of the first function and the second function to obtain an amplification factor k and an offset b in the basic linear function. Further, after the amplification factor k and the offset b are calculated, the system corrects the basic linear function through the amplification factor k and the offset b to obtain a calibration linear function, and calculates a calibration input voltage value with high accuracy from the input voltage value acquired by the voltage acquisition channel to be calibrated through the calibration linear function.
Further, the step of determining a calibration linear function according to the amplification factor and the offset includes:
a step S21 of adding the amplification factor and the offset to the basic linear function;
and step S22, correcting the basic linear function through the amplification factor and the offset to obtain a calibration linear function.
Further, the system adds the calculated amplification factor and offset to a basic linear function y ═ k × x + b, replaces the amplification factor and offset in the basic linear function in an unknown number form with the actual numerical value of the calculated amplification factor and the actual numerical value of the offset, finishes the correction of the basic linear function, obtains a calibration linear function with two unknown numbers, calculates a calibration input voltage with higher accuracy according to the input voltage value and the calibration linear function after obtaining the input voltage value from the voltage acquisition channel to be calibrated, and realizes the acquisition of high-accuracy signals without adopting high-accuracy components.
Step S30, polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values through the calibration linear function.
Furthermore, the system polls a plurality of voltage acquisition channels to be calibrated by calling an analog switch, acquires a plurality of analog voltage values acquired by the plurality of voltage acquisition channels to be calibrated, and converts the plurality of analog voltage values into a plurality of input voltage values existing in a digital signal through an amplifier and an AD converter. Furthermore, the system inputs a plurality of input voltage values into the calibration linear function, and the calibration input voltage values corresponding to the input voltage values are calculated through the calibration linear function.
The embodiment provides an ADC (analog to digital converter) acquisition method, device, equipment and storage medium based on self calibration, when a calibration instruction is received, a first voltage acquisition channel and a second voltage acquisition channel are polled respectively to obtain a first channel voltage and a second channel voltage; calculating an amplification factor and an offset of the basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset; polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through a calibration linear function. According to the invention, under the condition of not adopting high-precision components, firstly, the amplification factor and the offset of the basic linear function are calculated according to the first channel voltage and the second channel voltage, then, the calibration linear function is obtained according to the amplification factor and the offset, and the calibration input voltage corresponding to the input voltage acquired by the voltage acquisition channel to be calibrated is calculated through the calibration linear function, so that the acquisition of high-precision signals is realized, and the acquisition precision of an ADC system is improved.
Further, referring to fig. 3, a second embodiment of the self-calibration-based ADC acquisition method according to the present invention is proposed based on the first embodiment of the self-calibration-based ADC acquisition method according to the present invention, and in the second embodiment, the step of calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage:
step S23, obtaining a basic linear function, and generating a first function based on the basic linear function, the first channel voltage and a first standard channel voltage;
step S24, generating a second function based on the basic linear function, the second channel voltage and a second standard channel voltage;
and step S25, calculating the amplification factor and the offset of the basic linear function according to the first function and the second function.
Further, a network module can be arranged in the system, so that various information can be obtained from the internet through the network module. Further, the system calls the network module to obtain a basic linear function y ═ k × x + b from the internet, and obtains a first standard channel voltage corresponding to the first channel voltage and representing the reference voltage, and a second standard channel voltage corresponding to the second channel voltage and representing the reference ground voltage. Further, the system inputs the first channel voltage and the first standard channel voltage to the basic linear function to form a first function, such as: the first channel voltage is Vo-(n+1)The first standard channel voltage is VI-(n+1)Then the first function is Vo-(n+1)＝k*VI-(n+1)+ b; meanwhile, the system inputs the second channel voltage and the second standard channel voltage into the basic linear function to form a second function, for example: the second channel voltage is Vo-(n+2)The second standard channel voltage is VI-(n+2)Then a second function Vo-(n+2)＝k*VI-(n+2)+ b. Further, the system obtains a first function V according to the first channel voltage, the first standard channel voltage and a basic linear functiono-(n+1)＝k*VI-(n+1)+ b and a second function V obtained by combining the second channel voltage, the second standard channel voltage and the basic linear functiono-(n+2)＝k*VI-(n+2)And + b, calculating an amplification coefficient k and an offset b.
Further, the step of calculating the amplification factor and the offset of the basic linear function according to the first function and the second function includes:
step S251, integrating the first function and the second function into an equation set;
step S252, solving the equation set to obtain the amplification factor and the offset of the basic linear function.
Further, the system obtains a first function V by combining the first channel voltage, the first standard channel voltage and a basic linear functiono-(n+1)＝k*VI-(n+1)+ b and a second function V obtained by combining the second channel voltage, the second standard channel voltage and the basic linear functiono-(n+2)＝k*VI-(n+2)+ b is integrated into the following system of equations:
wherein, Vo-(n+1)Is a first channel voltage, VI-(n+1)Is a first standard channel voltage, Vo-(n+2)Is the second channel voltage, VI-(n+2)Is the second standard channel voltage.
Further, the system calls a voltage calibration algorithm program, solves the equation set in a manner of solving the equation set, and obtains an amplification factor k and an offset b of the basic linear function after the solution is completed.
According to the embodiment, the amplification factor and the offset of the basic linear function are calculated through a voltage calibration algorithm program according to the first channel voltage, the first standard channel voltage, the second standard channel voltage and the basic linear function, so that the calibration linear function is further obtained according to the amplification factor and the offset, an accurate calibration input voltage value is calculated through the calibration linear function, the acquisition of high-precision signals is realized under the condition that high-precision components are not adopted, and the acquisition precision of an ADC system is improved.
Further, a third embodiment of the self-calibration-based ADC acquisition method according to the present invention is provided based on the first embodiment of the self-calibration-based ADC acquisition method according to the present invention, and in the third embodiment, the step of polling a plurality of input voltage values of a plurality of to-be-calibrated voltage acquisition channels and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function includes:
step S31, calling an analog switch, and polling a plurality of voltage acquisition channels to be calibrated in the analog switch respectively through the analog switch to obtain a plurality of analog voltage values;
step S32 of converting the plurality of analog voltage values into a plurality of corresponding input voltage values by an amplifier and an AD converter;
in step S33, the plurality of input voltage values are input to the calibration linear function, and a plurality of calibration input voltage values corresponding to the plurality of input voltage values are calculated.
Further, the system calls an analog switch to control the analog switch to poll the plurality of voltage acquisition channels to be calibrated one by one, specifically, the system controls the analog switch to turn on the switch to an interface of the voltage acquisition channels to be calibrated, which needs to acquire an input voltage value, so that the analog switch is connected with the current voltage acquisition channel to be calibrated to acquire the analog voltage value acquired by the voltage acquisition channels to be calibrated, further, the system controls the analog switch to poll the rest of the voltage acquisition channels to be calibrated one by one, and a plurality of analog voltage values are obtained after the polling is finished. Further, the system transmits the plurality of the analog voltage values obtained by polling to an amplifier through an output end of an analog switch one by one, amplifies the plurality of the analog voltage values by preset times through the amplifier to obtain a plurality of amplified analog voltage values, further transmits the plurality of the amplified analog voltage values to an AD converter through the output end of the amplifier, and converts the plurality of the amplified analog voltage values into a plurality of input voltage values existing in a digital signal through the AD converter according to an analog/digital conversion method distribution. Furthermore, the system respectively inputs the converted multiple input voltage values into the corrected calibration linear function, and respectively calculates the calibration input voltage value corresponding to each input voltage value through the calibration linear function.
In the embodiment, the input voltage value is obtained by the analog voltage value acquired by the analog switch through the amplifier and the AD converter, and the input voltage value is input into the corrected calibration linear function to calculate the calibration input voltage value.
Further, based on the first embodiment of the ADC acquisition method based on self calibration of the present invention, a fourth embodiment of the ADC acquisition method based on self calibration of the present invention is provided, in which, before the step of polling the first voltage acquisition channel and the second voltage acquisition channel respectively to obtain the first channel voltage and the second channel voltage, the method further includes:
step b1, detecting whether the current time is the calibration time or whether the temperature change value is larger than the preset temperature threshold value within the preset time in real time;
b2, if the current time is the calibration time or the temperature change value is greater than the preset temperature threshold value within the preset time, judging that the condition of entering the calibration mode is reached, and generating a calibration instruction;
step b3, if the current time is not the calibration time or the temperature variation value in the preset time is less than the preset temperature threshold, it is determined that the condition for entering the calibration mode is not reached.
Further, the system calls the information detection module, detect the present time in real time, judge whether the time interval between the last calibration time and present time reaches the preset time interval, through confirming whether the present moment is the calibration moment, judge whether the condition to enter the calibration mode, wherein preset time interval is set by users according to the actual demand or the system is automatic to be set for; or, the current temperature of the system is detected in real time through a temperature sensor in the information detection module, and whether the condition of entering the calibration mode is met is judged by judging whether the temperature change value of the current temperature in the preset time reaches a preset temperature threshold value, wherein the preset time and the preset temperature threshold value are set by a user according to actual requirements. Further, if the time interval between the last calibration time and the current time is detected to reach a preset time interval, or the temperature change value of the current temperature within the preset time reaches a preset temperature threshold value, the condition of entering a calibration mode is judged to be reached, and a system generates a calibration instruction for calibrating the amplification factor and the offset so as to control an analog switch to execute 'polling a first voltage acquisition channel and a second voltage acquisition channel respectively' to obtain a first channel voltage and a second channel voltage; and calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset, so as to finish calibration of the amplification factor and the offset.
In the embodiment, whether the condition for entering the calibration mode is met is determined by detecting whether the current time is the calibration time or whether the temperature change value in the preset time is greater than the preset temperature threshold value, and when the current time is the calibration time or the temperature change value in the preset time is greater than the preset temperature threshold value, the condition for entering the calibration mode is determined, and a calibration instruction is generated, so that the amplification factor and the offset of the basic linear function are calculated through the first channel voltage and the second channel voltage, and the determination of the calibration linear function is completed.
Further, a fifth embodiment of the ADC acquisition method based on self calibration according to the present invention is proposed based on the first embodiment of the ADC acquisition method based on self calibration according to the present invention, and in the fifth embodiment, before the step of calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage, the method further includes:
step c1, comparing the first channel voltage and the second channel voltage with a preset threshold respectively, and determining whether an abnormal input voltage exists in the first channel voltage and the second channel voltage;
step c2, if any one of the first channel voltage and the second channel voltage is greater than or equal to the preset threshold, determining that an abnormal input voltage exists, and outputting abnormal prompt information;
and c3, if the first channel voltage and the second channel voltage are both smaller than the preset threshold value, determining that the system is normal.
Further, in order to ensure the accuracy of the collected data, before calculating the amplification factor and the offset of the basic linear function, the system needs to verify whether the inside of the system is abnormal, specifically, the system compares the first channel voltage with a preset threshold value to determine whether the first channel voltage is normal, compares the second channel voltage with the preset threshold value to determine whether the second channel voltage is normal, wherein the preset threshold value is used for verifying whether the channel voltage is abnormal, and if the channel voltage is greater than or equal to the preset threshold value, the system is indicated to have the abnormality inside. Further, if the first channel voltage and the second channel voltage are compared with the preset threshold respectively, it is determined that any one of the channel voltages is greater than or equal to the preset threshold, it is indicated that at least one of the two channel voltages is an abnormal input voltage, one or more abnormalities exist in the system, and the system outputs abnormality prompt information to remind a user of troubleshooting the system and guarantee the acquisition precision of the ADC system. If the first channel voltage and the second channel voltage are determined to be smaller than the preset threshold value after comparison, it is indicated that the two channel voltages acquired by the system are both normal values, the system judges that no abnormality exists in the system, and the amplification factor and the offset of the basic linear function can be calculated based on the first channel voltage and the second channel voltage.
In this embodiment, before calculating the amplification factor and the offset of the basic linear function based on the first channel voltage and the second channel voltage, it is verified whether there is an abnormality in the system, and if there is any one of the obtained first channel voltage and the obtained second channel voltage that is greater than or equal to a preset threshold, an abnormality prompt message is output to remind a user to check the system, so as to ensure the acquisition accuracy of the ADC system.
Further, the invention also provides an ADC acquisition device based on self-calibration.
Referring to fig. 4, fig. 4 is a functional module schematic diagram of a first embodiment of an ADC acquisition device based on self-calibration according to the present invention.
The ADC acquisition device based on self calibration comprises:
the polling module 10 is configured to poll the first voltage acquisition channel and the second voltage acquisition channel respectively to obtain a first channel voltage and a second channel voltage when receiving a calibration instruction;
a determining module 20, configured to calculate an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determine a calibration linear function according to the amplification factor and the offset;
the calculating module 30 is configured to poll a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculate calibration input voltage values corresponding to the plurality of input voltage values through the calibration linear function.
Further, the polling module 10 includes:
the first detection unit is used for detecting whether the current moment is a calibration moment or whether a temperature change value is greater than a preset temperature threshold value within a preset time in real time;
the first judgment unit is used for judging that the condition of entering a calibration mode is reached and generating a calibration instruction if the current moment is the calibration moment or the temperature change value in the preset time is greater than the preset temperature threshold value;
and the second judgment unit is used for judging that the condition of entering the calibration mode is not met if the current moment is not the calibration moment or the temperature change value in the preset time is smaller than the preset temperature threshold value.
Further, the determining module 20 includes:
the acquisition unit is used for acquiring a basic linear function and generating a first function based on the basic linear function, the first channel voltage and a first standard channel voltage;
a generating unit, configured to generate a second function based on the basic linear function, the second channel voltage, and a second standard channel voltage;
and the calculation unit is used for calculating the amplification factor and the offset of the basic linear function according to the first function and the second function.
Further, the determining module 20 further includes:
the integration unit is used for integrating the first function and the second function into an equation set;
and the solving unit is used for solving the equation set to obtain the amplification factor and the offset of the basic linear function.
Further, the determining module 20 further includes:
the comparison unit is used for respectively comparing the first channel voltage and the second channel voltage with a preset threshold value and determining whether an abnormal input voltage exists in the first channel voltage and the second channel voltage;
a third determination unit, configured to determine that an abnormal input voltage exists and output an abnormal prompt message if any one of the first channel voltage and the second channel voltage is greater than or equal to the preset threshold;
and the fourth judging unit is used for judging that the system is normal if the first channel voltage and the second channel voltage are both smaller than the preset threshold value.
Further, the determining module 20 further includes:
an adding unit configured to add the amplification factor and the offset to the basic linear function;
and the correction unit is used for correcting the basic linear function through the amplification factor and the offset to obtain a calibration linear function.
Further, the calculation module 30 includes:
the polling unit is used for calling an analog switch, and polling a plurality of voltage acquisition channels to be calibrated in the analog switch respectively through the analog switch to obtain a plurality of analog voltage values;
a conversion unit for converting the plurality of analog voltage values into a plurality of input voltage values respectively corresponding thereto through an amplifier and an AD converter;
and the input unit is used for respectively inputting the plurality of input voltage values into the calibration linear function, and calculating to obtain a plurality of calibration input voltage values corresponding to the plurality of input voltage values.
In addition, the present invention also provides a storage medium, which is preferably a computer readable storage medium, on which an ADC acquisition program based on self-calibration is stored, and when being executed by a processor, the ADC acquisition program based on self-calibration realizes the steps of the embodiments of the ADC acquisition method based on self-calibration.
In the embodiments of the self-calibration-based ADC acquisition device and the computer-readable medium of the present invention, all technical features of the embodiments of the self-calibration-based ADC acquisition method are included, and the description and explanation contents are basically the same as those of the embodiments of the self-calibration-based ADC acquisition method, and are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or a part contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk), and includes a plurality of instructions for enabling a terminal device (which may be a fixed terminal, such as an internet of things smart device including smart homes, such as a smart air conditioner, a smart lamp, a smart power supply, a smart router, etc., or a mobile terminal, including a smart phone, a wearable networked AR/VR device, a smart sound box, an autonomous driving automobile, etc.) to execute the method according to each embodiment of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A self-calibration based ADC acquisition method is characterized by comprising the following steps:
when a calibration instruction is received, polling a first voltage acquisition channel and a second voltage acquisition channel respectively to obtain a first channel voltage and a second channel voltage;
calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset;
polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated, and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function.
2. The method of self-calibration based ADC acquisition according to claim 1, wherein said step of calculating the amplification and offset of the basic linear function based on said first channel voltage and said second channel voltage comprises:
acquiring a basic linear function, and generating a first function based on the basic linear function, the first channel voltage and a first standard channel voltage;
generating a second function based on the basic linear function, the second channel voltage and a second standard channel voltage;
and calculating the amplification factor and the offset of the basic linear function according to the first function and the second function.
3. The method of claim 2, wherein the step of calculating the amplification factor and the offset of the basic linear function according to the first function and the second function comprises:
integrating the first function and the second function into an equation set;
and solving the equation set to obtain the amplification factor and the offset of the basic linear function.
4. The method for self-calibration based ADC acquisition according to claim 1, wherein the step of polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively by the calibration linear function comprises:
calling an analog switch, and respectively polling a plurality of voltage acquisition channels to be calibrated in the analog switch through the analog switch to obtain a plurality of analog voltage values;
converting the plurality of analog voltage values into a plurality of corresponding input voltage values by an amplifier and an AD converter;
and respectively inputting the plurality of input voltage values into the calibration linear function, and calculating to obtain a plurality of calibration input voltage values corresponding to the plurality of input voltage values.
5. The method of self-calibration based ADC acquisition according to claim 1, wherein said step of calculating the amplification and offset of the basic linear function based on said first channel voltage and said second channel voltage further comprises:
comparing the first channel voltage and the second channel voltage with a preset threshold value respectively, and determining whether an abnormal input voltage exists in the first channel voltage and the second channel voltage;
if any one of the first channel voltage and the second channel voltage is greater than or equal to the preset threshold, judging that an abnormal input voltage exists, and outputting abnormal prompt information;
and if the first channel voltage and the second channel voltage are both smaller than the preset threshold value, judging that the system is normal.
6. The self-calibration based ADC sampling method of claim 1, wherein before the step of polling the first voltage acquisition channel and the second voltage acquisition channel respectively to obtain the first channel voltage and the second channel voltage, further comprising:
detecting whether the current moment is a calibration moment or whether a temperature change value in a preset time is greater than a preset temperature threshold value in real time;
if the current time is the calibration time or the temperature change value in the preset time is greater than the preset temperature threshold, judging that the condition of entering a calibration mode is reached, and generating a calibration instruction;
and if the current time is not the calibration time or the temperature change value in the preset time is smaller than the preset temperature threshold value, judging that the condition of entering the calibration mode is not met.
7. The method of self-calibration based ADC acquisition of claim 1, wherein said step of determining a calibration linear function based on said amplification factor and said offset comprises:
adding the amplification factor and the offset to the base linear function;
and correcting the basic linear function through the amplification factor and the offset to obtain a calibration linear function.
8. A self-calibration based ADC acquisition device, comprising:
the polling module is used for respectively polling the first voltage acquisition channel and the second voltage acquisition channel when a calibration instruction is received to obtain a first channel voltage and a second channel voltage;
the determining module is used for calculating an amplification factor and an offset of a basic linear function based on the first channel voltage and the second channel voltage, and determining a calibration linear function according to the amplification factor and the offset;
and the calculation module is used for polling a plurality of input voltage values of a plurality of voltage acquisition channels to be calibrated and calculating calibration input voltage values corresponding to the plurality of input voltage values respectively through the calibration linear function.
9. A self calibration based ADC acquisition device comprising a memory, a processor and a self calibration based ADC acquisition program stored on the memory and executable on the processor, the self calibration based ADC acquisition program when executed by the processor implementing the steps of the self calibration based ADC acquisition method according to any one of claims 1-7.
10. A storage medium having stored thereon a self-calibration based ADC acquisition program which, when executed by a processor, implements the steps of the self-calibration based ADC acquisition method according to any one of claims 1-7.
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