CN202903870U - Ultra-low-power high-speed high-precision data acquisition system - Google Patents
Ultra-low-power high-speed high-precision data acquisition system Download PDFInfo
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- CN202903870U CN202903870U CN 201220514602 CN201220514602U CN202903870U CN 202903870 U CN202903870 U CN 202903870U CN 201220514602 CN201220514602 CN 201220514602 CN 201220514602 U CN201220514602 U CN 201220514602U CN 202903870 U CN202903870 U CN 202903870U
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Abstract
The utility model provides an ultra-low-power high-speed high-precision data acquisition system. The data acquisition system is composed of an automatic AGC and filtering module, a temperature-compensation and acquisition-compensation module, a data acquisition zeroing module, an AD conversion module, an automatic power consumption control module, a data processing module and an optoelectronic communication interface. After external analog signals are accessed through the automatic AGC and filtering module, preceding-stage signal filtering conditioning is completed; after conditioned with output signals of the temperature-compensation and acquisition-compensation module and the data acquisition zeroing module, the external analog signals are amplified; and the external analog signals are inputted into the AD conversion module and are converted into digital quantity; the digital quantity is inputted into the data processing module and data processing is performed on the digital quantity; and finally, the digital quantity is transmitted to terminal equipment through the optoelectronic communication interface. The automatic power consumption control module provide a power source for each module, and is controlled by the data processing module and is made to participate in dormant mode switching and power consumption management. The data acquisition system of the utility model is suitable for data acquisition environments which have no power-supplying power source access, are inconvenient to access to a power source or small-power power sources such as a battery or laser, and require high speed and high precision.
Description
Technical field
The utility model relates to a kind of high speed high-accuracy data collection system of super low-power consumption, and it is to power for access, be inconvenient to access the small-power powers such as power supply, use battery or laser without power supply, and needs the data acquisition environment of high-speed, high precision.
Background technology
High-voltage mutual inductor is as the important component part of Electric Energy Tariff Point Metering Device, to carry out fair and just trade settlement, the correct legal measurement instrument that calculates, examines electric system internal technology economic target between genco and grid company, grid company and electric company, electric company and the power consumer.At present, electrical network primary equipment repair based on condition of component is the inexorable trend that China's electrical network develops rapidly, also is to reduce the probability that has an accident is overhauled in operating cost, minimizing because of overequipment means.In the past, mutual inductor off-line calibration (Site Detection) mainly was the mutual inductor week inspection needs that satisfy as electric power meter.China's electric system has the huge electric power mutual-inductor of quantity, and their the error performance workload of test that has a power failure is huge, wastes time and energy, and can not obtain True Data under the three-phase electriferous state.Carry out the technical research of mutual inductor on-line calibration and can overcome the shortcoming of above-mentioned off-line calibration, improve transformer error feature measurement uncertainty level, take a firm foundation for the integrated on-line calibration of realizing electric power meter, improve the accuracy of electric energy metrical.
For the metering that realizes 110kV～220kV electric pressure critical point stoichiometric point is calibrated with the full-automatic real-time online of mutual inductor, the conventional criteria voltage current transformer can't satisfy the needs of on-line calibration because of factors such as volume are large, heavy, must be with the normal voltage current transformer through technological transformation, reach convenient and install, lightweight, purpose that volume is little, cause thus the mutual inductor output power less, signal amplitude is less, be subjected to easily the impact of outside electromagnetic interference, be unfavorable for high precision and the long-distance transmissions of signal.In order to address this problem, must adopt low-power consumption, at a high speed, high-precision data acquisition system (DAS), signal digitizing nearby with the output of normal voltage current transformer, and through the mode such as optical fiber digital signal is carried out long-distance transmissions, can guarantee like this precision and the real-time of signal, can carry out long-distance transmissions again, reach the purpose of on-the-spot on-line calibration.
Chinese utility model patent " high speed data acquisition system " (application number: 200820163669.2 applyings date: 2008-09-04) proposed a kind of high speed data acquisition system, centered by CPLD, mainly comprise data acquisition circuit, data are processed, the data storage, several parts such as power module, by the input port that is connected successively, adjustable amplifying circuit, the high-speed a/d chip, the CPLD chip, output port forms, the CPLD chip is to use VHDL language, the functional module of its realization mainly is to disappear to tremble module, control module, the FIFO memory module is specifically judged by amplitude, the FIFO storage, clock generating, four parts of timing sequence generating consist of.Yet this data acquisition unit can't be applied to above-mentioned circuit.
In view of this, the utility model provides a kind of high speed high-accuracy data collection system of super low-power consumption, to address the above problem.
Summary of the invention
The purpose of this utility model is the problem that proposes for background technology, a kind of high speed high-accuracy data collection system of super low-power consumption is proposed, it is to power for access, be inconvenient to access the small-power powers such as power supply or battery or laser without power supply, and needs the data acquisition environment of high-speed, high precision.Native system is applied to transformer station's high-pressure side sampled voltage and current signal at present.
The technical solution of the utility model is: a kind of high speed high-accuracy data collection system of super low-power consumption, by automatic AGC and filtration module, temperature compensation and collection compensating module, data acquisition zeroing module, the AD modular converter, automatic power consumption control module, data processing module, the photoelectricity communication interface forms, it is characterized in that, after external analog signal accesses by automatic AGC and filtration module, finish prime signal filtering conditioning, and with temperature compensation and gather compensating module and the output signal conditioning of data acquisition zeroing module after through amplifying, enter the AD modular converter and convert digital quantity to, enter again data processing module and carry out the data processing, send to terminal device by the photoelectricity communication interface at last, automatic power consumption control module wherein, power supply is provided for each module, and switched and power managed by data processing module control and participate in park mode.
The high speed high-accuracy data collection system of aforesaid super low-power consumption is characterized in that, further comprises the data sampling sequential generation module based on the high stable of STM32F103VET6, guarantees the time control accuracy of data acquisition.
The high speed high-accuracy data collection system of aforesaid super low-power consumption, it is characterized in that, the core of described AD modular converter adopts 18 high-speed, high precision SAR analog to digital converter AD7631, its built-in 18 high-speed sampling ADC, internal conversion clock, internal reference voltage source, error correction circuit, and serial and parallel system interface port.
The high speed high-accuracy data collection system of aforesaid super low-power consumption is characterized in that, the typical drift value of the inner 5V reference voltage of described AD7631 is 3ppm/ ℃; Integral non-linear error representative value ± 1.5 LSB, maximal value ± 2.5 LSB; The bipolarity full scale error is ± 0.09%FS; Parallel interface is supported the output of 18 bit data, can disposable output translation data.
The beneficial effects of the utility model are: the utility model is applicable to without the power supply access, is inconvenient to access the small-power power power supplies such as power supply or battery or laser, and needs the data acquisition environment of high-speed, high precision.The sampling precision of this system reaches 5/10000ths, and working current is less than 80mA, and the highest sample rate reaches 125kbps, has the energy-conservation management systems such as dormancy; Have Long-distance Control and communication function; Have the high speed optoelectronic interface, sampled data can be passed to ground based terminal in real time, can be applied to the advantages such as transmission line of electricity of 220kV.And general data acquisition system electric current generally reaches more than the 0.5A, and power consumption is large; Without telecommunication and control function, can't isolated high voltage etc. problem, can't be applied to the High voltage output circuit.
Description of drawings
Fig. 1 is the theory diagram of high speed high-accuracy data collection system of the super low-power consumption of the utility model embodiment.
Embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.Those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
As shown in Figure 1, the high speed high-accuracy data collection system of the super low-power consumption that the utility model provides, whole system comprises following part: automatic AGC and filtration module, temperature compensation and collection compensating module, data acquisition zeroing module, AD modular converter, sampling time sequence generation module, data processing module, automatic power consumption control module, photoelectricity communication interface.
After external analog signal accesses by automatic AGC and filtration module, after finishing prime signal filtering conditioning, and with temperature compensation and gather compensating module and the output signal conditioning of data acquisition zeroing module after through amplifying, enter the AD modular converter and convert digital quantity to, entering data processing module carries out sending to terminal device by the photoelectricity communication interface at last after data process again.Wherein automatic power consumption control module provides power supply for each unit, and is subjected to the power managed such as data processing module control and participate in park mode switching.
Based on the data sampling sequential generation module of the high stable of STM32F103VET6, guarantee the time control accuracy of data acquisition, and power consumption is little.
Adopt AD modular converter and automatic AGC and the filtration module of high-speed, high precision low-power consumption, whole circuit part all adopts low-power consumption low noise chip, and suitably in addition noise reduction process and technique for temperature compensation, the system temperature of making float impact be reduced to ten thousand/below.
Automatic power consumption control module, data acquisition zeroing module, temperature compensation and collection compensating module, data processing module makes the sampling precision of whole system reach 5/10000ths, and working current is less than 80mA, the highest sample rate reaches 125kbps, and temperature range reaches-10 ℃-60 ℃.
The principle of work of system is: the feeble signal of normal voltage or current transformer output is input to automatic AGC and filtration module, improve the signal to noise ratio (S/N ratio) of signal through prime filtering after, amplify and filtering through automatic gain again, make the signal voltage amplitude of output near the best input voltage of AD modular converter.The AD modular converter is under the effect of data acquisition zeroing module and temperature compensation and collection compensating module, automatic zero set (AZS) and calibration temperature are floated before each the measurement, after receiving the external sampling trigger pip, trigger voltage retainer and carry out analog to digital conversion immediately, transformation result is delivered to data processing module, sends through the photoelectricity communication interface.
The core of AD modular converter adopts 18 high-speed, high precision SAR analog to digital converter AD7631.Its built-in 18 high-speed sampling ADC, internal conversion clock, an internal reference voltage source (and buffering), error correction circuit, and serial and parallel system interface port, has the fully differential analog input, optional input voltage range ability, have larger dynamic range and higher precision, and power consumption is extremely low, is fit to very much the fields such as Industry Control, electric power, instrument measurement.
The typical drift value of the inner 5V reference voltage of AD7631 only is 3ppm/ ℃; Integral non-linear error representative value ± 1.5 LSB, maximal value ± 2.5 LSB; The bipolarity full scale error is ± 0.09%FS; Parallel interface is supported 18 bit data output, can disposable output translation data, improved the reading speed of data; The fully differential analog signal of input is sampled and keep at the negative edge of CNVST, and the time compole of sampling is short, can ignore time delay.These excellent performances are the bases that determine that the notebook data harvester has the performances such as low-power consumption, high speed and high precision.
Aspect low power dissipation design, adopt automatic power consumption control module to reduce the power consumption of whole system.Adopt the technology of following three aspects::
⑴ the switching of, mode of operation.When the Measurement and calibration test is finished, by sending stop instruction, make processor operate in shutdown mode and reduce power consumption, whole data acquisition system (DAS) is least in power-consuming at this moment, and the assurance data acquisition system (DAS) can be worked the longer time.When needs are carried out the Measurement and calibration test, can wake data acquisition system (DAS) up by sending synchronizing pulse.Enter immediately the self check duty after data acquisition system (DAS) is waken up, and enter the data sampling mode of operation.
⑵, turn off the obsolete function of master chip, turn off its power supply when peripheral components is not worked.
⑶ the processing of, I/O mouth.In the situation that guarantees external function, aim at bidirectional interface, if the I/O mouth has external pull-up resistor, then should before entering power-down mode, set high, to close inner pull-down transistor; If I/O adopts on the inside and draws, then should set low to close inside and pull up transistor.The I/O mouth of splitting Lou output should set high before entering power-down mode; Untapped I/O mouth is set high resistance state, and close the clock of I/O mouth.
The content that is not described in detail in this instructions belongs to the known prior art of this area professional and technical personnel.
Claims (4)
1. the high speed high-accuracy data collection system of a super low-power consumption, by automatic AGC and filtration module, temperature compensation and collection compensating module, data acquisition zeroing module, the AD modular converter, automatic power consumption control module, data processing module, the photoelectricity communication interface forms, it is characterized in that, after external analog signal accesses by automatic AGC and filtration module, finish prime signal filtering conditioning, and with temperature compensation and gather compensating module and the output signal conditioning of data acquisition zeroing module after through amplifying, enter the AD modular converter and convert digital quantity to, enter again data processing module and carry out the data processing, send to terminal device by the photoelectricity communication interface at last, automatic power consumption control module wherein, power supply is provided for each module, and switched and power managed by data processing module control and participate in park mode.
2. the high speed high-accuracy data collection system of super low-power consumption according to claim 1 is characterized in that, further comprises the data sampling sequential generation module based on the high stable of STM32F103VET6, guarantees the time control accuracy of data acquisition.
3. the high speed high-accuracy data collection system of super low-power consumption according to claim 1, it is characterized in that, the core of described AD modular converter adopts 18 high-speed, high precision SAR analog to digital converter AD7631, its built-in 18 high-speed sampling ADC, internal conversion clock, internal reference voltage source, error correction circuit, and serial and parallel system interface port.
4. the high speed high-accuracy data collection system of super low-power consumption according to claim 3 is characterized in that, the typical drift value of the inner 5V reference voltage of described AD7631 is 3ppm/ ℃; Integral non-linear error representative value ± 1.5 LSB, maximal value ± 2.5 LSB; The bipolarity full scale error is ± 0.09%FS; Parallel interface is supported the output of 18 bit data, can disposable output translation data.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914690A (en) * | 2012-10-09 | 2013-02-06 | 中国电力科学研究院 | High-speed and high-precision data acquisition system with ultralow power consumption |
| CN109491299A (en) * | 2018-12-22 | 2019-03-19 | 蚌埠学院 | A kind of super low-power consumption data collection station based on MCU |
| CN112034233A (en) * | 2020-08-31 | 2020-12-04 | 国网山东省电力公司电力科学研究院 | High-precision alternating current testing device and method |
| CN115015797A (en) * | 2022-08-08 | 2022-09-06 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
-
2012
- 2012-10-09 CN CN 201220514602 patent/CN202903870U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914690A (en) * | 2012-10-09 | 2013-02-06 | 中国电力科学研究院 | High-speed and high-precision data acquisition system with ultralow power consumption |
| CN109491299A (en) * | 2018-12-22 | 2019-03-19 | 蚌埠学院 | A kind of super low-power consumption data collection station based on MCU |
| CN109491299B (en) * | 2018-12-22 | 2023-10-03 | 蚌埠学院 | Ultra-low power consumption data acquisition terminal based on MCU |
| CN112034233A (en) * | 2020-08-31 | 2020-12-04 | 国网山东省电力公司电力科学研究院 | High-precision alternating current testing device and method |
| CN115015797A (en) * | 2022-08-08 | 2022-09-06 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
| CN115015797B (en) * | 2022-08-08 | 2022-10-14 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
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Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER NAME: CHINA ELECTRIC POWER RESEARCH INSTITUTE |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: China Electric Power Research Institute Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Patentee before: China Electric Power Research Institute Patentee before: State Grid Corporation of China |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: China Electric Power Research Institute Patentee before: State Grid Corporation of China |
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Granted publication date: 20130424 |