CN201780329U - Grid voltage signal sampling system - Google Patents
Grid voltage signal sampling system Download PDFInfo
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- CN201780329U CN201780329U CN2010202135937U CN201020213593U CN201780329U CN 201780329 U CN201780329 U CN 201780329U CN 2010202135937 U CN2010202135937 U CN 2010202135937U CN 201020213593 U CN201020213593 U CN 201020213593U CN 201780329 U CN201780329 U CN 201780329U
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- dividing potential
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Abstract
The utility model provides a grid voltage signal sampling system, which comprises a reference voltage generating module, a step-down module and a signal processing module, wherein the reference voltage generating module is used for generating the reference voltage; the step-down module obtains a voltage signal by stepping-down the grid voltage; the signal processing module is used for processing the voltage obtained by the step-down module and the signal generated after superimposing the reference voltage; and the reference voltage generating module, the step-down module and the signal processing module are electrically connected sequentially. By adopting the technical scheme, the grid voltage signal sampling system can effectively improve capacity of resisting disturbance of the integral sampling system, effectively broaden the frequency of the acquisitioned signal, and factually reflect relatively the grid working condition.
Description
Technical field
The utility model belongs to high-voltage signal sampling system field, relates in particular to a kind of voltage signal sampling system that is used for electrical network.
Background technology
Along with development economic and society, electrical network has become the indispensable part of modern industrial society, no matter the electricity consumption that is commercial power, household electricity or charging station has all be unable to do without electrical network, and the stability of electrical network has fundamental influence to the electricity consumption of various commercial power, household electricity and charging station.
Voltage signal relates to a vital parameter of grid stability, traditional electrical network mainly is by Industrial Frequency Transformer power network signal to be carried out the step-down sampling to the sampling of voltage, and the poor anti jamming capability that adopts Industrial Frequency Transformer that mains voltage signal is sampled, the cost height, and can cause system bulk to increase.Accompanying drawing 1 is depicted as the schematic diagram that adopts Industrial Frequency Transformer to sample, promptly undertaken utilizing single-chip microcomputer (sampling A) that the voltage after handling is sampled then after the step-down by the voltage of Industrial Frequency Transformer with electrical network, but the process that single-chip microcomputer is sampled to high-voltage signal is an one-way process, promptly requires the flow direction of signal to be: to be sampled unit stream to single-chip microcomputer.Yet when adopting Industrial Frequency Transformer to sample, the transmission direction of its signal is two-way, and the voltage that reaches the transformer two ends can produce reciprocal influence, is unfavorable for signals sampling, is easy to generate interference, causes sampling error bigger.When adopting Industrial Frequency Transformer that signal is sampled in addition, its signal transfer bandwidth is restricted, because Industrial Frequency Transformer just transmits at low frequency signal, the signal of upper frequency then can't transmit, the signal of gathering can't reflect the truth of electrical network, and there is serious distortion in sampled signal.
Summary of the invention
The utility model is poor to the mains voltage signal sampling precision for solving in the prior art, poor anti jamming capability, there is the technical matters of distortion in sampling, provide a kind of antijamming capability strong, the sampling precision height, the undistorted mains voltage signal sampling system of sampling is compared with traditional sampling system simultaneously, effectively reduce cost, reduced the volume of sampling system.
A kind of mains voltage signal sampling system, described voltage signal sampling system comprises:
Be used to produce the reference voltage generation module of a reference voltage;
Be used for line voltage is carried out the step-down module that a voltage signal was handled and obtained in step-down;
Be used for signal processing module that the signal after the stack of the resulting voltage of step-down module and reference voltage is handled;
Described reference voltage generation module, step-down module, signal processing module are electrically connected successively.
As a kind of preferred version, described step-down module comprises at least two dividing potential drop loads, described a plurality of dividing potential drop load and described electrical network are connected in series and form the loop, one end of described one of them divider resistance is electrically connected with described reference voltage generation module, and the other end of described this divider resistance is electrically connected with described signal processing module.
More preferably, described step-down module comprises the first dividing potential drop load R1, the second dividing potential drop load R2, the 3rd dividing potential drop load R3, the described first dividing potential drop load R1, the second dividing potential drop load R2 and the 3rd dividing potential drop load R3 and described electrical network are connected in series and form the loop, the end of the wherein said second dividing potential drop load R2 is electrically connected with described reference voltage generation module, and the other end of the described second dividing potential drop load R2 is electrically connected with described signal processing module.
Described reference voltage generation module comprises voltage source Vcc 1, the first load r1, the second load r2, the 3rd load r3 and have cathode terminal K, the reference voltage chip of anode tap A and reference edge R, the cathode terminal K of described reference voltage chip is connected with described voltage source Vcc 1 with the 3rd load r3 series connection back, the anode tap A ground connection of described reference voltage chip, the described first load r1, after connecting mutually, the second load r2 is connected in parallel on the negative electrode of described reference voltage chip, the anode two ends, the reference edge R of described reference voltage chip connects the tie point of the described first load r1 and the second load r2, and described cathode terminal K connects the end of the second dividing potential drop load R2.
More preferably, the negative electrode of described reference voltage chip, the anode two ends capacitor C that also is connected in parallel;
It is the chip of TL431 that described reference voltage chip preferably adopts model.
As further improvement, described signal processing module comprises an operational amplifier, and the negative input end of described operational amplifier is connected with described output terminal, and the other end of the described second dividing potential drop load R2 is connected with the positive input terminal of described operational amplifier.
It is the operational amplifier of LM258 that described operational amplifier preferably adopts model.
In the above technical scheme, after by the step-down module line voltage being carried out step-down, superpose with a reference voltage then, signal after the stack is carried out analyzing after the simple process, the transmission direction of its whole signal is a unidirectional delivery, effectively improved the antijamming capability of whole sampling system, improved sampling precision, effectively avoided simultaneously when adopting Industrial Frequency Transformer that signal is sampled, the problem that its signal transfer bandwidth is restricted, but the frequency of acquired signal is effectively widened, and can reflect the working condition of electrical network more really.
Description of drawings
Fig. 1 is the structural representation of a kind of mains voltage signal sampling system in the prior art;
Fig. 2 is the structural representation of a kind of embodiment of the utility model mains voltage signal sampling system.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 1, after existing line voltage sampling system adopts an Industrial Frequency Transformer T that line voltage is carried out step-down, the voltage signal of circuit by having load R1 ', R2 ', R3 ', R4 ', capacitor C and operational amplifier after to step-down handled then, obtains a sampled voltage then in order to carrying out subsequent treatment.Yet when adopting Industrial Frequency Transformer to sample, the transmission direction of its signal is two-way, and the voltage that reaches the transformer two ends can produce reciprocal influence, is unfavorable for signals sampling, is easy to generate interference, causes sampling error bigger.When adopting Industrial Frequency Transformer that signal is sampled in addition, its signal transfer bandwidth is restricted, because Industrial Frequency Transformer just transmits at low frequency signal, the signal of upper frequency then can't transmit, the signal of gathering can't reflect the truth of electrical network, and there is serious distortion in sampled signal.
As shown in Figure 2, the utility model comprises reference voltage generation module 4, is used to produce a reference voltage;
Step-down module 5 can be carried out the voltage of electrical network step-down and be handled and obtain a voltage signal more relatively low than line voltage;
Signal processing module 6 is used for the signal after resulting voltage of step-down module and the reference voltage stack is handled;
Described reference voltage generation module 4, step-down module 5, signal processing module 6 are electrically connected successively.
Described step-down module 5 comprises at least two dividing potential drop loads, described a plurality of dividing potential drop load and described electrical network are connected in series and form the loop, one end of described one of them divider resistance is electrically connected with described reference voltage generation module 4, and the other end of described this divider resistance is electrically connected with described signal processing module 6.
As a kind of preferred embodiment, described step-down module comprises the first dividing potential drop load R1, the second dividing potential drop load R2, the 3rd dividing potential drop load R3, the described first dividing potential drop load R1, the second dividing potential drop load R2 and the 3rd dividing potential drop load R3 and described electrical network are connected in series and form the loop, the end of the wherein said second dividing potential drop load R2 is electrically connected with described reference voltage generation module, and the other end of the described second dividing potential drop load R2 is electrically connected with described signal processing module.Electrical network will be obtained the lower voltage signal of a relative line voltage in a dividing potential drop load with the described first dividing potential drop load R1, the second dividing potential drop load R2, the 3rd dividing potential drop load R3 after connecting therein, as on the second dividing potential drop load R2, obtaining a voltage signal, this voltage signal can correctly reflect the situation of line voltage, no matter line voltage is a high-frequency signal or a low frequency signal, can both proportionally be sent in the described dividing potential drop load, can effectively solve and use Industrial Frequency Transformer can not transmit the problem of high-frequency signal in the conventional art.Use several dividing potential drop loads to replace Industrial Frequency Transformer to carry out the sampling of voltage has been effectively reduced the volume of sampling system simultaneously.
Further preferably, described reference voltage generation module comprises voltage source Vcc 1, the first load r1, the second load r2, the 3rd load r3 and have cathode terminal K, the reference voltage chip of anode tap A and reference edge R, the cathode terminal K of described reference voltage chip is connected with described voltage source Vcc 1 with the 3rd load r3 series connection back, the anode tap A ground connection of described reference voltage chip, the described first load r1, after connecting mutually, the second load r2 is connected in parallel on the two ends of described reference voltage chip, the reference edge R of described reference voltage chip connects the tie point of the described first load r1 and the second load r2, and described cathode terminal K connects the end of the second dividing potential drop load R2.Described reference voltage chip is preferably the chip that model is TL431.
It is the chip of TL431 that described reference voltage chip preferably adopts model.
As further improvement, the negative electrode of described reference voltage chip, an anode two ends capacitor C also in parallel, described capacitor C can carry out a filter action, makes it possible to obtain a more stable reference voltage.
Described signal processing module comprises an operational amplifier, and the negative input end of described operational amplifier is connected with the output terminal of described operational amplifier, and the other end of the described second dividing potential drop load R2 is connected with the positive input terminal of described operational amplifier.The signal of described signal processing module after to the stack of the resulting voltage of step-down module and reference voltage carries out simple process, as processing and amplifying, Filtering Processing, then by the 4th load r4 with this voltage signal output in order to this signal is carried out the subsequent treatment analysis.Preferably, the model of described operational amplifier is LM258.
The utility model is in conjunction with the concrete workflow of the foregoing description, and is as follows:
Electrical network obtains a voltage signal after by the step-down of step-down module on the second dividing potential drop load R2, the waveform of this voltage signal is for having a sine-shaped ac voltage signal, suppose that maximum true amplitude is 3V, the minimal negative amplitude just is-3V, because of this reference voltage generation module produces a reference voltage, promptly the incoming end at the second dividing potential drop load R2 produces a reference voltage, by the second dividing potential drop load R2 resulting voltage of step-down module and reference voltage are superposeed, and be must be with the negative loop lifting of this voltage signal on the occasion of signal after superposeing with the resulting voltage signal of step-down module to the requirement of this reference voltage of being produced, and the maximum amplitude of institute's lifting must be within the reception voltage range of described operational amplifier, for example, operational amplifier the maximum voltage that can carry be 7V, reference voltage must be between 3-4V so, as reference voltage is 4V, the resulting voltage signal of the second dividing potential drop load R2 is (3V-+3V) with will to obtain a maximum amplitude be 7V after the reference voltage stack so, minimum amplitude is the voltage signal of 1V, and this voltage signal just in time do not exceed operational amplifier the maximum voltage that can carry, the voltage signal after last signal processing module 6 will superpose is handled afterwards to export to prepare against by the 4th load r4 and follow-up this numerical value is carried out analyzing and processing.Above technical scheme, because of operational amplifier will be higher than processing degree of accuracy to AC signal to the processing degree of accuracy of direct current signal, therefore with the ac voltage signal of the electrical network that collected by with the reference voltage stack after become a direct current signal, utilize operational amplifier again this direct current signal to be analyzed then, effectively improved its sampling precision.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1. a mains voltage signal sampling system is characterized in that, described mains voltage signal sampling system comprises:
Be used to produce the reference voltage generation module (4) of a reference voltage;
Be used for line voltage is carried out the step-down module (5) that a voltage signal was handled and obtained in step-down;
Be used for signal processing module (6) that the signal after the stack of the resulting voltage of step-down module (5) and reference voltage is handled;
Described reference voltage generation module (4), step-down module (5), signal processing module (6) are electrically connected successively.
2. mains voltage signal sampling system according to claim 1, it is characterized in that, described step-down module (5) comprises at least two dividing potential drop loads, described a plurality of dividing potential drop load and described electrical network are connected in series and form the loop, one end of described one of them dividing potential drop load is electrically connected with described reference voltage generation module (4), and the other end of described this dividing potential drop load is electrically connected with described signal processing module (6).
3. mains voltage signal sampling system according to claim 2, it is characterized in that, described step-down module (5) comprises the first dividing potential drop load (R1), the second dividing potential drop load (R2), the 3rd dividing potential drop load (R3), the described first dividing potential drop load (R1), the second dividing potential drop load (R2) and the 3rd dividing potential drop load (R3) are connected in series with described electrical network and form the loop, one end of the wherein said second dividing potential drop load (R2) is electrically connected with described reference voltage generation module (4), and the other end of the described second dividing potential drop load (R2) is electrically connected with described signal processing module (6).
4. a kind of mains voltage signal sampling system according to claim 3, it is characterized in that, described reference voltage generation module (4) comprises voltage source (Vcc1), first load (r1), second load (r2), the 3rd load (r3) and have cathode terminal (K), the reference voltage chip of anode tap (A) and reference edge (R), the cathode terminal of described reference voltage chip (K) is connected with described voltage source (Vcc) with the 3rd load (r3) series connection back, the anode tap of described reference voltage chip (A) ground connection, described first load (r1), after connecting mutually, second load (r2) is connected in parallel on the negative electrode of described reference voltage chip, the anode two ends, the reference edge of described reference voltage chip (R) connects the tie point of described first load (r1) and second load (r2), and described cathode terminal (K) connects an end of the second dividing potential drop load (R2).
5. mains voltage signal sampling system according to claim 4 is characterized in that, the negative electrode of described reference voltage chip, the anode two ends capacitor (C) that also is connected in parallel.
6. mains voltage signal sampling system according to claim 4 is characterized in that, the model of described reference voltage chip is TL431.
7. mains voltage signal sampling system according to claim 4, it is characterized in that, described signal processing module comprises operational amplifier, the negative input end of described operational amplifier is connected with the output terminal of described operational amplifier, and the other end of the described second dividing potential drop load (R2) is connected with the positive input terminal of described operational amplifier.
8. mains voltage signal sampling system according to claim 7 is characterized in that, the model of described operational amplifier is LM258.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202135937U CN201780329U (en) | 2010-05-31 | 2010-05-31 | Grid voltage signal sampling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202135937U CN201780329U (en) | 2010-05-31 | 2010-05-31 | Grid voltage signal sampling system |
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| Publication Number | Publication Date |
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| CN201780329U true CN201780329U (en) | 2011-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202135937U Expired - Lifetime CN201780329U (en) | 2010-05-31 | 2010-05-31 | Grid voltage signal sampling system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735908A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Network voltage sampling circuit |
| CN102749504A (en) * | 2012-07-10 | 2012-10-24 | 上海市电力公司 | Sampling circuit of synchronizing signals of grid voltage |
| CN103472295A (en) * | 2013-09-26 | 2013-12-25 | 中国检验检疫科学研究院 | Residual voltage signal collecting and processing method and system |
| CN109596881A (en) * | 2018-12-07 | 2019-04-09 | 浙江正泰仪器仪表有限责任公司 | A kind of alternating voltage sampling circuit and system |
-
2010
- 2010-05-31 CN CN2010202135937U patent/CN201780329U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735908A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Network voltage sampling circuit |
| CN102749504A (en) * | 2012-07-10 | 2012-10-24 | 上海市电力公司 | Sampling circuit of synchronizing signals of grid voltage |
| CN103472295A (en) * | 2013-09-26 | 2013-12-25 | 中国检验检疫科学研究院 | Residual voltage signal collecting and processing method and system |
| CN109596881A (en) * | 2018-12-07 | 2019-04-09 | 浙江正泰仪器仪表有限责任公司 | A kind of alternating voltage sampling circuit and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110330 |
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| CX01 | Expiry of patent term |