CN111157783A - Control system for common acquisition of differential signal and waveform data - Google Patents
Control system for common acquisition of differential signal and waveform data Download PDFInfo
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- CN111157783A CN111157783A CN201911385292.4A CN201911385292A CN111157783A CN 111157783 A CN111157783 A CN 111157783A CN 201911385292 A CN201911385292 A CN 201911385292A CN 111157783 A CN111157783 A CN 111157783A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/04—Measuring form factor, i.e. quotient of root-mean-square value and arithmetic mean of instantaneous value; Measuring peak factor, i.e. quotient of maximum value and root-mean-square value
Abstract
The invention relates to a differential signal and waveform data co-acquisition control system which comprises a signal conversion unit matched with an input cable, wherein the signal conversion unit is sequentially connected with a differential signal processing unit and a single-ended signal processing unit, the differential signal processing unit is matched with an analog signal sampling end, and the single-ended signal processing unit is matched with a digital signal sampling end. The invention effectively solves the problem of fusion of differential signal sampling and single-ended signal sampling, simultaneously realizes a hardware circuit required by single-ended sampling under the condition of not influencing differential sampling, allows a special metering chip to finish metering data acquisition in the current and voltage acquisition monitoring of an electric power system, and also allows an MCU independent AD single-ended sampling port to realize high-speed waveform data acquisition, has high working efficiency, is convenient for direct processing and output by a control part in the follow-up process, has intuitive result and is convenient for analysis and processing.
Description
Technical Field
The present invention relates to measuring electrical variables; the technical field of measuring magnetic variables, in particular to a common acquisition control system for differential signals and waveform data.
Background
The common acquisition of the differential signal and the waveform data refers to the simultaneous acquisition of electric power metering parameters and waveform data in the power utilization monitoring process.
In the prior art, in electrical monitoring and power monitoring equipment, measurement parameters such as power and electricity quantity and voltage are mostly acquired and analyzed by adopting a current dedicated metering chip, power waveform data is acquired and analyzed by adopting independent AD (analog-to-digital) signals, the former generally adopts differential signals to acquire analog data, the latter adopts single-ended AD acquisition, and the two acquisition hardware have different structures.
The acquisition scheme in the prior art causes that the hardware compatibility cannot be achieved in the aspect of signal acquisition, and only one implementation mode can be selected for design under the condition that both occasions need to be met, so that the advantages of an electric power metering chip in the aspect of metering cannot be exerted, and the software development difficulty under the condition of single processing can be increased.
Disclosure of Invention
The invention solves the problems that in the prior art, power monitoring equipment on the market generally adopts single AD sampling or single metering chip for processing, the measurement is complex, and the measurement result cannot be obtained at one time, so that the subsequent corresponding problem is solved.
The invention adopts the technical scheme that the system comprises a signal conversion unit matched with an input cable, wherein the signal conversion unit is sequentially connected with a differential signal processing unit and a single-ended signal processing unit, the differential signal processing unit is matched with an analog signal sampling end, and the single-ended signal processing unit is matched with a digital signal sampling end.
Preferably, the signal conversion unit is a current transformer, and the current transformer is sleeved outside the input cable.
Preferably, the differential signal processing unit includes first resistance and second resistance that establish ties to signal conversion unit both ends, first resistance and second resistance are indirectly, first resistance and second resistance and signal conversion unit are equipped with first analog signal sampling end and second analog signal sampling end with the cooperation respectively between, first analog signal sampling end and second analog signal sampling end are connected to analog signal measurement chip.
Preferably, the single-ended signal processing unit includes operational amplifier, first analog signal sample terminal and second analog signal sample terminal are connected to operational amplifier's input through third resistance and fourth resistance respectively, operational amplifier's output is connected to between fourth resistance and operational amplifier's the input through feedback resistance, operational amplifier's output cooperation filter unit is equipped with the digital signal sample terminal, the digital signal sample terminal is connected to AD sampling chip.
Preferably, a fifth resistor is connected between the third resistor and the input terminal of the operational amplifier, and the fifth resistor is connected to the dc bias voltage.
Preferably, the analog signal metering chip and the AD sampling chip are connected to the MCU.
Preferably, the MCU comprises:
the input unit is used for acquiring data input by the analog signal metering chip and the AD sampling chip;
a comparison unit for comparing the synchronism of the input data;
the processing unit is used for carrying out time delay processing on the output of the analog signal metering chip;
and the output unit is used for outputting the regulated differential signal sampling and single-ended signal sampling results.
Preferably, in the input unit, burrs of the acquired data input by the analog signal metering chip and the AD sampling chip are filtered, and the data are converted into a waveform diagram of an XOY coordinate system with equal intervals.
Preferably, in the comparison unit, a 0-point after the waveform is stabilized is taken for comparison, if there is an inconsistency of the input data, there is a delay, and the processing unit processes the inconsistency, otherwise, the output unit outputs the inconsistency.
Preferably, in the processing unit, the signal is interpolated, and the output of the new analog signal metering chip is constructed by sampling the time of the delay between the two waveforms.
The invention relates to an optimized common acquisition control system for differential signals and waveform data, which realizes the conversion from strong current to weak current by matching with a signal conversion unit arranged on an input cable, is convenient for subsequent sampling processing, the signal conversion unit is sequentially connected with a differential signal processing unit and a single-ended signal processing unit, an analog signal sampling end is matched with the differential processing unit to output differential signals, a digital signal sampling end is matched with the single-ended signal processing unit to output single-ended waveforms, namely, the differential signals and the single-ended signals are coupled and compatible, the problem of waveform sampling and metering fusion sampling is solved, and two results can be obtained by one-time metering.
The invention effectively solves the problem of fusion of differential signal sampling and single-ended signal sampling, simultaneously realizes a hardware circuit required by single-ended sampling under the condition of not influencing differential sampling, allows a special metering chip to finish metering data acquisition in the current and voltage acquisition monitoring of an electric power system, and also allows an MCU independent AD single-ended sampling port to realize high-speed waveform data acquisition, has high working efficiency, is convenient for direct processing and output by a control part in the follow-up process, has intuitive result and is convenient for analysis and processing.
Drawings
FIG. 1 is a schematic structural diagram of a co-production control system of the present invention;
fig. 2 is a schematic structural diagram of the MCU of the present invention, wherein arrows indicate the data transmission direction.
Detailed Description
The present invention is described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.
The invention relates to a differential signal and waveform data co-acquisition control system which comprises a signal conversion unit matched with an input cable 1, wherein the signal conversion unit is sequentially connected with a differential signal processing unit and a single-ended signal processing unit, the differential signal processing unit is matched with an analog signal sampling end, and the single-ended signal processing unit is matched with a digital signal sampling end 3.
In the invention, because the input is the strong current, the signal conversion unit is arranged by matching with the input cable 1, so that the conversion from the strong current to the weak current is realized, and the subsequent sampling treatment is convenient.
In the invention, the signal conversion unit is sequentially connected with the differential signal processing unit and the single-ended signal processing unit, the analog signal sampling end is matched with the differential processing unit to output differential signals, and the digital signal sampling end 3 is matched with the single-ended signal processing unit to output single-ended waveforms, namely, the differential signals and the single-ended signals are coupled and compatible, so that the problem of waveform sampling and metering fusion sampling is solved, and two results can be obtained by one-time metering.
The invention effectively solves the problem of fusion of differential signal sampling and single-ended signal sampling, simultaneously realizes a hardware circuit required by single-ended sampling under the condition of not influencing differential sampling, allows a special metering chip to finish metering data acquisition in the current and voltage acquisition monitoring of an electric power system, and also allows an MCU independent AD single-ended sampling port to realize high-speed acquisition of waveform data, has high working efficiency, is convenient for directly processing and outputting by a control part in the follow-up process, has intuitive result and is convenient for analysis and processing.
The signal conversion unit is a current transformer 4, and the current transformer 4 is sleeved outside the input cable 1.
In the invention, the signal conversion unit is generally set as a common current transformer 4, the working principle of the signal conversion unit is the conventional technical content in the field, and the signal conversion unit can convert a strong current into a weak current for detection only by sleeving the signal conversion unit outside the input cable 1.
The differential signal processing unit comprises a first resistor 5 and a second resistor 6 which are connected to two ends of the signal conversion unit in series, the first resistor 5 and the second resistor 6 are indirectly connected, a first analog signal sampling end 2-1 and a second analog signal sampling end 2-2 are respectively arranged between the first resistor 5 and the second resistor 6 and the signal conversion unit in a matched mode, and the first analog signal sampling end 2-1 and the second analog signal sampling end 2-2 are connected to the analog signal metering chip 15.
The single-ended signal processing unit includes operational amplifier 7, first analog signal sample terminal 2-1 and second analog signal sample terminal 2-2 are connected to operational amplifier 7's input through third resistance 8 and fourth resistance 9 respectively, operational amplifier 7's output is connected to between fourth resistance 9 and operational amplifier 7's the input through feedback resistance 10, operational amplifier 7's output cooperation filter unit 12 is equipped with digital signal sample terminal 3, digital signal sample terminal 3 is connected to AD sampling chip 11.
A fifth resistor 13 is connected between the third resistor 8 and the input terminal of the operational amplifier 7, and the fifth resistor 13 is connected to a dc bias voltage 14.
The analog signal metering chip 15 and the AD sampling chip 11 are connected to the MCU.
In the invention, for the output end of the signal conversion unit which has been converted into weak current signal, the first resistor 5 and the second resistor 6 are respectively connected, the first resistor 5 and the second resistor 6 are indirectly connected, and the high potential of the first resistor 5 and the second resistor 6 is taken to output differential signal, wherein the differential signal can be directly sampled by the first analog signal sampling end 2-1 and the second analog signal sampling end 2-2 and input to the analog signal metering chip 15 as differential signal.
In the present invention, the output positive signal and negative signal are used as the input terminal of the operational amplifier 7, and the dc bias voltage 14 and the feedback network are provided for the operational amplifier 7.
In the invention, a third resistor 8 at a positive signal position, a fifth resistor 13 connected with a direct current bias voltage 14, a fourth resistor 9 at a negative signal position and a feedback resistor 10 form an amplification factor network together to amplify an output value.
In the invention, the output end of an operational amplifier 7 is matched with a filtering unit 12 and is provided with a digital signal sampling end 3, the digital signal sampling end 3 is grounded, and a waveform signal is output to an AD sampling chip 11; in general, the filtering unit 12 is an RC low-pass filter.
In the invention, the specific specification of each component is not the content of the technical protection, and a person skilled in the art can test the components according to the requirement until a numerical value matched with the sampling condition is obtained.
The MCU includes:
the input unit is used for acquiring data input by the analog signal metering chip 15 and the AD sampling chip 11;
a comparison unit for comparing the synchronism of the input data;
a processing unit, which is used for carrying out time delay processing on the output of the analog signal metering chip 15;
and the output unit is used for outputting the regulated differential signal sampling and single-ended signal sampling results.
In the input unit, burrs of the acquired data input by the analog signal metering chip 15 and the AD sampling chip 11 are filtered, and the data are converted into oscillograms of an XOY coordinate system with equal intervals.
And in the comparison unit, 0 locus after the waveform is stabilized is taken for comparison, if the input data are inconsistent, time delay exists, the processing unit is used for processing, and if the input data are inconsistent, the output unit is used for outputting.
In the processing unit, the signal is interpolated, and a new output of the analog signal metering chip 15 is constructed by sampling the time of delay between two waveforms.
In the invention, the analog signal metering chip 15 and the AD sampling chip 11 are both connected to the MCU, and after the data of the analog signal metering chip and the AD sampling chip are obtained through the input unit, the synchronism of the input data can be directly compared on the basis of the analog signal and the waveform.
In the present invention, the waveform diagrams of the XOY coordinate systems with equal intervals refer to rectangular coordinate systems with uniform and equal graduation.
In the invention, if the two are synchronous, the next work can be directly applied or executed, and then output is carried out, otherwise, the next work needs to be processed by the processing unit.
In the invention, because of the processing of the circuit, in the actual comparison process, except for burrs, the data of the two may have certain time delay, so that the waveform can be subjected to difference from 50 sampling points to 200, and then, the value is extracted corresponding to the time delay, new signal data is established and output.
The invention realizes the conversion from strong current to weak current by matching with the signal conversion unit arranged on the input cable 1, and is convenient for subsequent sampling processing, the signal conversion unit is sequentially connected with the differential signal processing unit and the single-ended signal processing unit, the analog signal sampling end is matched with the differential processing unit to output differential signals, the digital signal sampling end 3 is matched with the single-ended signal processing unit to output single-ended waveforms, i.e. the differential signals and the single-ended signals are coupled and compatible, the problem of waveform sampling and metering fusion sampling is solved, and two results can be obtained by one-time metering.
The invention effectively solves the problem of fusion of differential signal sampling and single-ended signal sampling, simultaneously realizes a hardware circuit required by single-ended sampling under the condition of not influencing differential sampling, allows a special metering chip to finish metering data acquisition in the current and voltage acquisition monitoring of an electric power system, and also allows an MCU independent AD single-ended sampling port to realize high-speed waveform data acquisition, has high working efficiency, is convenient for direct processing and output by a control part in the follow-up process, has intuitive result and is convenient for analysis and processing.
Claims (10)
1. A control system for common acquisition of differential signal and waveform data, characterized by: the system comprises a signal conversion unit matched with an input cable, wherein the signal conversion unit is sequentially connected with a differential signal processing unit and a single-ended signal processing unit, the differential signal processing unit is matched with an analog signal sampling end, and the single-ended signal processing unit is matched with a digital signal sampling end.
2. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 1, wherein: the signal conversion unit is a current transformer, and the current transformer is sleeved outside the input cable.
3. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 1, wherein: the differential signal processing unit comprises a first resistor and a second resistor which are connected to two ends of the signal conversion unit in series, the first resistor and the second resistor are indirectly connected, a first analog signal sampling end and a second analog signal sampling end are respectively arranged between the first resistor and the signal conversion unit in a matched mode, and the first analog signal sampling end and the second analog signal sampling end are connected to the analog signal metering chip.
4. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 3, wherein: the single-ended signal processing unit includes operational amplifier, first analog signal sample terminal and second analog signal sample terminal are connected to operational amplifier's input through third resistance and fourth resistance respectively, operational amplifier's output is connected to between fourth resistance and operational amplifier's the input through feedback resistance, operational amplifier's output cooperation filter unit is equipped with the digital signal sample terminal, the digital signal sample terminal is connected to AD sampling chip.
5. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 4, wherein: and a fifth resistor is connected between the third resistor and the input end of the operational amplifier and is connected to the direct current bias voltage.
6. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 4, wherein: and the analog signal metering chip and the AD sampling chip are connected to the MCU.
7. The system of claim 6 for controlling the co-sampling of differential signal and waveform data, wherein: the MCU includes:
the input unit is used for acquiring data input by the analog signal metering chip and the AD sampling chip;
a comparison unit for comparing the synchronism of the input data;
the processing unit is used for carrying out time delay processing on the output of the analog signal metering chip;
and the output unit is used for outputting the regulated differential signal sampling and single-ended signal sampling results.
8. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 7, wherein: and in the input unit, burrs of the acquired data input by the analog signal metering chip and the AD sampling chip are filtered, and the data are converted into oscillograms of an XOY coordinate system with equal intervals.
9. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 7, wherein: and in the comparison unit, 0 locus after the waveform is stabilized is taken for comparison, if the input data are inconsistent, time delay exists, the processing unit is used for processing, and if the input data are inconsistent, the output unit is used for outputting.
10. A system for controlling co-sampling of differential signal and waveform data as claimed in claim 7, wherein: in the processing unit, the signals are interpolated, the sampling is carried out corresponding to the time of delay between two waveforms, and the output of a new analog signal metering chip is constructed.
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| CN201911385292.4A CN111157783A (en) | 2019-12-28 | 2019-12-28 | Control system for common acquisition of differential signal and waveform data |
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| CN201911385292.4A CN111157783A (en) | 2019-12-28 | 2019-12-28 | Control system for common acquisition of differential signal and waveform data |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112130025A (en) * | 2020-08-21 | 2020-12-25 | 中国电力科学研究院有限公司 | Differential-to-single-ended sampling device for platform area topology identification |
| CN112379162A (en) * | 2020-08-21 | 2021-02-19 | 中国电力科学研究院有限公司 | Differential-to-single-ended sampling device and method for station area topology identification |
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