Full-autonomous high-precision analog quantity acquisition device and method

Abstract

The invention discloses a fully-autonomous high-precision analog quantity acquisition device and method, and relates to the technical field of analog quantity acquisition and conversion. The fully-autonomous high-precision analog quantity acquisition device comprises a signal conditioning module, a sampling and holding module, an analog-to-digital conversion module, a digital isolation module, a main control module and a differential amplification module, according to the invention, the components of each module are autonomous devices, the autonomous controllability is high, two analog-to-digital converters are used to quantize the analog quantity, one is used to determine the range of the analog quantity, and the other is used to amplify and quantize again in the range where errors are easy to occur, so that quantization errors and non-linear errors are made up, and the conversion precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of analog quantity acquisition and conversion, and in particular to a fully autonomous high-precision analog quantity acquisition device and method. Background Art

[0002] With the deepening of automation of industrial equipment, environmental monitoring or equipment status monitoring through sensors has become a mainstream trend. However, most of the output of sensors is analog data, which has higher requirements for acquisition and conversion accuracy in fields such as satellite drive control, rotating machinery monitoring, missile guidance, etc.

[0003] The self-developed analog-to-digital conversion device has a low degree of autonomy, and the conversion accuracy needs to be improved. Therefore, in order to solve the problems of low degree of autonomy and insufficient conversion accuracy, the present invention proposes a fully autonomous high-precision analog quantity acquisition device and method. All devices are self-developed, and a method is proposed to improve the conversion accuracy.

[0004] The existing technology also has the following shortcomings, which are specifically reflected in: 1. The core components in the existing collection devices are all mature components of other companies, with a low degree of autonomy, poor autonomous controllability, and limited application. Components of other companies may have built-in functional modules such as data collection and transmission. During use, the data in the collection device is transmitted to other company servers without the user's knowledge, resulting in data leakage, which poses a serious information security threat to the user.

[0005] 2. The conversion accuracy of the existing acquisition devices is insufficient, the data accuracy is damaged, and the product quality cannot be guaranteed. For the acquisition devices of electronic component parameters such as resistance and capacitance values, if the accuracy is insufficient, there will be loopholes in the screening and quality control of components during the production process, and components that do not meet the standards will be installed in the products, causing electronic products to malfunction, affecting product quality and brand image. Summary of the invention

[0006] The purpose of the present invention is to provide a fully autonomous high-precision analog quantity acquisition device and method, which solves the problems existing in the background technology.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a fully autonomous high-precision analog quantity acquisition device and method, including: a signal conditioning module for differentially inputting analog quantity signals, filtering and amplifying the output.

[0008] The sample-and-hold module is used to sample the collected analog signal and keep the signal unchanged for a period of time.

[0009] The analog-to-digital conversion module is used to convert analog signals into digital signals and transmit sampling information in the form of digital signals.

[0010] Digital isolation module, used to isolate analog signals and digital signals.

[0011] The main control module is used to receive digital signals for calculation and comparison, and transmit the information to the terminal through wireless communication for data summary and analysis.

[0012] The differential amplifier module is used to differentially amplify the initial sampling value and the analog value obtained by the main control module after the first analog-to-digital conversion, and input them into the analog-to-digital conversion module.

[0013] The digital-to-analog conversion module is used to convert digital signals into analog signals.

[0014] Preferably, a method for a fully autonomous high-precision analog quantity acquisition device includes: step S1, signal conditioning, step S2, sampling and holding, step S3, analog-to-digital conversion, step S4, digital isolation, step S5, main control module, step S6, differential amplification, and step S7, digital-to-analog conversion.

[0015] Analog signal differential input, single-ended output signal after step S1 and signal conditioning The signal is input to the sampling and holding module to perform step S2, sampling and holding. In the sampling and holding module, It will last for a while, during which time, After step S3, analog-to-digital conversion is quantized into a digital signal , After step S4, digital isolation is transmitted to step S5, the main control module.

[0016] The main control module receives the digital signal , and its corresponding analog signal value is .

[0017] The main control module converts the digital signal Previous code value The corresponding analog value Input to the digital-to-analog converter to perform step S7, digital-to-analog conversion, and obtain analog quantity after conversion , as one side input of the differential circuit, and the other side input is the initial analog signal collected by the sample and hold circuit ,Will and Execute step S6, differentially amplify and output analog signal .

[0018] Step S7: Digital to analog conversion Quantized to digital signal , After step S4, the digital isolation is transmitted to the main control module, and the main control module The code value used is determined as .

[0019] The main control module combines digital and , obtain the compensated signal, and store the data or send it wirelessly.

[0020] The beneficial effects of the present invention are: 1. In the present invention, the core components in the collection device are all autonomous devices with a high degree of autonomy and high autonomous controllability, which reduces the risk of data being stolen or tampered with by other companies and better protects the company's information security. Especially in data collection devices involving corporate security, important infrastructure and other fields, the use of autonomous core components can ensure the autonomous control of data and prevent the leakage of sensitive information.

[0021] 2. In the present invention, two analog-to-digital converters are used to quantize the analog quantity. One converter determines the range of the analog quantity, and the other converter amplifies and quantizes again within the range where errors are prone to occur, thereby compensating for quantization errors and nonlinear errors, improving conversion accuracy, reducing the probability of failure of electronic products, and improving product quality and brand image. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the composition framework of the present invention.

[0024] Figure 2 This is a flow chart of analog quantity acquisition and conversion of the present invention.

[0025] Figure 3 This is a diagram illustrating the error compensation method of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Reference Figure 1 As shown, the present invention provides a fully autonomous high-precision analog quantity acquisition device and method, including: a signal conditioning module for differentially inputting analog quantity signals, filtering and amplifying the output, which can effectively avoid interference during the transmission process.

[0028] The signal conditioning module includes an RC filter circuit and an instrument amplifier, which filters and amplifies the collected analog signal. The input end of the conditioning circuit is connected to the input end of the sampling and holding module.

[0029] The sample-and-hold module is used to sample the collected analog signal and keep the signal unchanged for a period of time, thereby improving the conversion accuracy and stability.

[0030] The output end of the sampling and holding module is divided into two paths, one path is connected to the input end of the analog-to-digital converter 1, and the other path is connected to the input end of the differential amplifier circuit.

[0031] The analog-to-digital conversion module is used to convert analog signals into digital signals, transmit sampling information with digital signals, and improve the signal's anti-interference ability.

[0032] After the analog-to-digital converter 1 converts the analog signal into a digital signal, its output end is connected to the input end of the digital isolation module 1. After the conversion is completed, the analog-to-digital converter outputs the digital signal to the digital isolation module 3. The output of the digital isolation module 3 is connected to the main control module. The analog-to-digital converters 1, 2 and the digital-to-analog converter use ADC chips and DAC chips independently produced by SiRuiPu Microelectronics Technology. The resolution of the analog-to-digital converter 1 and the digital-to-analog converter must be consistent, and the range of the analog-to-digital converter 1 and the output voltage range of the digital-to-analog converter must be consistent.

[0033] In the present invention, two analog-to-digital converters are used to quantize the analog quantity, one determines the range of the analog quantity, and the other converter amplifies and quantizes again within the range where errors are prone to occur, thereby compensating for quantization errors and nonlinear errors, improving conversion accuracy, reducing the probability of failure of electronic products, and improving product quality and brand image.

[0034] The digital isolation module is used to isolate analog signals from digital signals. It is located between the analog-to-digital conversion module, the digital-to-analog conversion module and the main control module to prevent digital signals from interfering with analog signals.

[0035] Digital isolation module 1 separates analog quantity and digital quantity to prevent mutual interference. The output end of digital isolation module 1 is connected to the main control module. The function of digital isolation module 2 is also to isolate analog signals and digital signals. Its output is connected to the input of the digital-to-analog converter. Digital isolation modules 1, 2, and 3 are integrated in one chip. CA-IS3742HW from Shanghai Chuan Tuwei is selected, with an isolation voltage of up to 5000V and a transmission rate of up to 150Mbps.

[0036] The main control module is used to receive digital signals for calculation and comparison, and transmit the information to the terminal through wireless communication for data summary and analysis.

[0037] The main control module is responsible for receiving the analog signal transmitted by the analog-to-digital converter 1, and outputting the digital signal to the input end of the digital isolation module 2 after judgment. The main control module selects the chip produced by Loongson Technology Co., Ltd. and selects the appropriate main control chip according to system requirements, such as the number of IO interfaces, communication interfaces, wireless communication interfaces, etc.

[0038] The differential amplifier module is used to differentially amplify the initial sampling value and the analog value obtained by the main control module after the first analog-to-digital conversion, and input them into the analog-to-digital conversion module.

[0039] The input of the differential amplifier circuit is the output of the sampling and holding circuit and the output of the digital-to-analog converter. After differential amplification, its output is connected to the input of the analog-to-digital converter 2.

[0040] The digital-to-analog conversion module is used to convert digital signals into analog signals for comparison with initial analog values. Its resolution is consistent with that of the analog-to-digital converter 1, and the range of the analog-to-digital converter 1 is consistent with the output voltage range of the digital-to-analog converter.

[0041] The digital-to-analog converter converts the digital quantity transmitted by the main control into an analog quantity as the input of one side of the differential amplifier circuit.

[0042] It should be noted that the components of each module are all independent devices with high autonomy and controllability.

[0043] In the present invention, the core components in the collection device are all autonomous devices with a high degree of autonomy and high autonomous controllability, which reduces the risk of data being stolen or tampered with by other companies and better protects the company's information security. Especially in data collection devices involving areas such as corporate security and important infrastructure, the use of autonomous core components can ensure the autonomous control of data and prevent the leakage of sensitive information.

[0044] refer to Figure 2 A method for a fully autonomous high-precision analog quantity acquisition device includes: step S1, signal conditioning, step S2, sampling and holding, step S3, analog-to-digital conversion, step S4, digital isolation, step S5, main control module, step S6, differential amplification, and step S7, digital-to-analog conversion.

[0045] Analog signal differential input, single-ended output signal after filtering by signal conditioning circuit method , the signal is input to the sample and hold module, in which, It will last for a while, during which time, Quantized into digital signal by analog-to-digital converter 1 , Transmitted to the main control module through the digital isolator.

[0046] It should be noted that each digital signal corresponds to a different voltage analog signal value. The corresponding digital signal after quantization is .

[0047] The main control module receives the digital signal , and its corresponding analog signal value is , due to the existence of quantization error, Not necessarily equal to .

[0048] The main control module converts the digital signal Previous code value The corresponding analog value Input to the digital-to-analog converter, and get the analog value after conversion , as one side input of the differential circuit, and the other side input is the initial analog signal collected by the sample and hold circuit ,Will and Perform differential comparison to output analog signal .

[0049] Analog-to-digital converter 2 will Quantized to digital signal , The digital isolator transmits the signal to the main control module, which then The code value used is determined as .

[0050] Analog-to-digital converter 1 is mainly responsible for performing preliminary sampling of the signal to facilitate the main control module to determine the interval in which the signal is located; analog-to-digital converter 2 is mainly responsible for reducing quantization error and nonlinear error.

[0051] The main control module combines digital and , obtain the compensated signal, and store the data or send it wirelessly.

[0052] The specific acquisition method of the present invention is to convert the analog quantity output by the digital-to-analog converter into With the initial sampling value Perform differential comparison and amplification to obtain the signal , this value is the amplification of the part that is prone to quantization error and nonlinear error in the first analog-to-digital conversion. Further quantitative analysis of this part can compensate for the error in the first analog-to-digital conversion; The analog-to-digital converter 2 converts it into a digital quantity m, which is then transmitted to the main control module. The main control module combines the digital quantities n-1 and m to obtain a compensated signal, and performs data storage or wireless transmission.

[0053] The digital quantity output by the main control module to the digital-to-analog converter can be changed according to the nonlinear error provided in different analog-to-digital converter manuals. It can be changed to n-2, n-3, etc. The essence is to further amplify and quantify the part with error to improve the conversion accuracy of this part, thereby improving the overall conversion accuracy.

[0054] refer to Figure 2 , 3 The high-precision acquisition method is explained. The analog signal is differentially input to the signal conditioning module, and the signal is obtained after filtering and amplification. The signal enters the sampling and holding module. Then the first analog-to-digital conversion is performed to convert the analog signal Convert to digital quantity , and get a rough collection result. The main control module determines the range of the digital quantity n and whether it is at the beginning of the conversion, that is, "1". If not, the digital signal The previous code value n-1 is output to the digital-to-analog converter and converted into an analog value , this is the general case; if so, take the digital signal 1 and output it to the digital-to-analog converter to convert it into analog quantity , this is a special case.

[0055] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A fully autonomous high-precision analog quantity acquisition device, characterized in that: include: The signal conditioning module is used to input the analog signal differentially, filter it and amplify it for output; The sampling and holding module is used to sample the collected analog signal and keep the signal unchanged for a period of time; The analog-to-digital conversion module is used to convert analog signals into digital signals and transmit sampling information in the form of digital signals; Digital isolation module, used to isolate analog signals and digital signals; The main control module is used to receive digital signals for calculation and comparison, and transmit the information to the terminal through wireless communication for data summary and analysis; The differential amplifier module is used to differentially amplify the initial sampling value and the analog value obtained by the main control module after the first analog-to-digital conversion, and input the differential amplification to the analog-to-digital conversion module; The digital-to-analog conversion module is used to convert digital signals into analog signals.

2. A method for executing the fully autonomous high-precision analog quantity acquisition device of claim 1, characterized in that: include: Step S1, signal conditioning, step S2, sampling and holding, step S3, analog-to-digital conversion, step S4, digital isolation, step S5, main control module, step S6, differential amplification, step S7, digital-to-analog conversion; Analog signal differential input, single-ended output signal after step S1 and signal conditioning The signal is input to the sampling and holding module to perform step S2, sampling and holding. In the sampling and holding module, It will last for a while, during which time, After step S3, analog-to-digital conversion is quantized into a digital signal , After step S4, digital isolation is transmitted to step S5, main control module; The main control module receives the digital signal , and its corresponding analog signal value is ; The main control module converts the digital signal Previous code value The corresponding analog value Input to the digital-to-analog converter to perform step S7, digital-to-analog conversion, and obtain analog quantity after conversion , as one side input of the differential circuit, and the other side input is the initial analog signal collected by the sample and hold circuit ,Will and Execute step S6, differentially amplify and output analog signal ; Step S7: Digital to analog conversion Quantized to digital signal , After step S4, the digital isolation is transmitted to the main control module, and the main control module The code value used is determined as ; The main control module combines digital and , obtain the compensated signal, and store the data or send it wirelessly.

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