CN1654965A - Signal sampling circuit for electric quantity monitor - Google Patents
Signal sampling circuit for electric quantity monitor Download PDFInfo
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- CN1654965A CN1654965A CN 200510024204 CN200510024204A CN1654965A CN 1654965 A CN1654965 A CN 1654965A CN 200510024204 CN200510024204 CN 200510024204 CN 200510024204 A CN200510024204 A CN 200510024204A CN 1654965 A CN1654965 A CN 1654965A
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Abstract
This invention discloses a signal sampling circuit used in quantity monitor including a bleeder circuit collecting three-phase voltages, a first multi-path conversion switch switching among the three-phase voltages, a first emitter-follower connected with the first multi-path switch connected with the first follower including a waveform diverter, a current mutual inductor collecting three-phase currents, a second multi-path conversion switch switching among the currents, a second emitter-follower connected with the second switch, a second rectifier switch connected with the second follower including a waveform diverter, a D/M converter connected with the output of the switches to be output to the processor after the discrelization.
Description
Technical field
The present invention relates generally to the monitoring technology in the low-voltage electrical apparatus, more particularly, relate to a kind of signal sample circuit of monitoring the electrical network electric weight.
Background technology
Electric quantity monitor is electric weight such as the three-phase voltage that is used for measuring a certain branch road of electronics distribution system, three-phase current, active power, power factor (PF), the ruuning situation that directly reflects this branch road, has local Presentation Function, can on instrument face plate, directly show related parameter, and have communication interface, can insert corresponding data network.In distribution system, need only an amount of electric quantity monitor of configuration and just can grasp the operation conditions of total system.
For electric quantity monitor, its topmost function is exactly the electric weight in the sampling monitoring electrical network, so the precision of sampling becomes one of main performance index of electric quantity monitor.In the prior art, obtain high precision, just need to adopt a large amount of components and parts, like this, the cost of entire circuit has just improved.Therefore, just need in the art a kind ofly can use fewer components and parts to reach signal sampling technology than higher (such as 0.2%) precision.
Summary of the invention
The purpose of this invention is to provide a kind of signal sample circuit that is used for electric quantity monitor that uses less components and parts just can reach higher precision.
According to of the present invention, a kind of signal sample circuit that is used for electric quantity monitor is provided, comprising:
Bleeder circuit links to each other with the power supply input, comprises three input ends, gathers three-phase voltage respectively;
First multicircuit switch switches between the three-phase voltage of being gathered, and realizes the time sharing sampling of three-phase voltage;
First emitter follower links to each other with described first multicircuit switch;
The first electronic commutation switch, link to each other with described first emitter follower, comprise a waveform turner in the described first electronic commutation switch, when described waveform turner is between 0～180 degree at input signal, pass through input signal, when input signal is between 180～360 degree, turn over turnback signal afterwards by input signal;
Current transformer links to each other with the power supply input, comprises three input ends, gathers three-phase current respectively;
Second multicircuit switch switches between the three-phase current of being gathered, and realizes the time sharing sampling of three-phase current, and described second multicircuit switch also is converted to voltage signal with current signal;
Second emitter follower links to each other with described second multicircuit switch;
The second electronic commutation switch, link to each other with described second emitter follower, comprise a waveform turner in the described second electronic commutation switch, when described waveform turner is between 0～180 degree at input signal, pass through input signal, when input signal is between 180～360 degree, turn over turnback signal afterwards by input signal;
Digital to analog converter links to each other with the output of the described first and second electronic commutation switches, outputs to processor after the output discretize with first, second electronic commutation switch.
According to an embodiment, described bleeder circuit also comprises four-input terminal, links to each other with ground wire.
According to an embodiment, described bleeder circuit comprises that the TVS transient voltage suppresses diode.
According to an embodiment, described second multicircuit switch and described first multicircuit switch use the public circuit of part.Such as, described second multicircuit switch and described first multicircuit switch use public multipath conversion chip; Wherein, described first multicircuit switch only comprises this multipath conversion chip, and described second multicircuit switch also comprises a current-to-voltage converting circuit.
Adopted technical scheme of the present invention, used multi-way switch can reduce hardware, the waveform reverse circuit has reasonable performance simultaneously, for satisfying precision, plays very big effect.The reverse signal of the inside can be used to judge the polarity of electric current and voltage again simultaneously, and is easy to use.
Description of drawings
The above and other features of the present invention, character and advantage will be by becoming more obvious below in conjunction with accompanying drawing to the description of embodiment, and identical in the accompanying drawings Reference numeral is represented identical embodiment, wherein:
Fig. 1 is the structured flowchart that is used for the signal sample circuit of electric quantity monitor according to of the present invention;
Fig. 2 is the circuit theory diagrams that are used for the signal sample circuit of electric quantity monitor according to of the present invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
With reference to figure 1, Fig. 1 is the structured flowchart that is used for the signal sample circuit 100 of electric quantity monitor according to of the present invention, and as shown, it comprises:
The first electronic commutation switch 108, link to each other with first emitter follower 106, comprise a waveform turner in the first electronic commutation switch 108, when the waveform turner is between 0～180 degree at input signal, pass through input signal, when input signal is between 180～360 degree, turn over turnback signal afterwards by input signal.Like this, the signal of output is between 0～180 degree all the time, has reached the purpose of rectification.Signal after the rectification is imported in the digital to analog converter 118.
Current transformer 110 links to each other with the power supply input, comprises three input ends, gathers three-phase current respectively.The three-phase current of gathering uses I respectively
A, I
BAnd I
CExpression.
Get back to Fig. 1, the described signal sample circuit 100 that is used for electric quantity monitor also comprises second emitter follower 114, links to each other with second multicircuit switch 112;
The second electronic commutation switch 116, link to each other with second emitter follower 114, comprise a waveform turner in the second electronic commutation switch 116, when described waveform turner is between 0～180 degree at input signal, pass through input signal, when input signal is between 180～360 degree, turn over turnback signal afterwards by input signal; Like this, the signal of output is between 0～180 degree all the time, has reached the purpose of rectification.Signal after the rectification is imported in the digital to analog converter 118.
Digital to analog converter 118 links to each other with 116 output with the first and second electronic commutation switches 108, outputs to processor after the output discretize with first, second electronic commutation switch 108,116.
Fig. 2 is a physical circuit figure according to above-mentioned block diagram.With reference to figure 2 as seen, in the bleeder circuit 102, the input of sampling three-phase voltage is interconnected by several resistance and forms, and the input of sampling ground wire does not have resistance.Current transformer 110 comprises three electric current mutual inductance module CT1, CT2 and CT3, gathers the electric current of three-phase respectively.In this embodiment, second multicircuit switch 112 and first multicircuit switch 108 use the public circuit of part.First multicircuit switch 108 only comprises the multipath conversion chip, and second multicircuit switch 112 also comprises a current-to-voltage converting circuit, as shown, this current-to-voltage converting circuit comprises three modular converters, be responsible for one tunnel current/voltage conversion respectively, each modular converter mainly is made of amplifier and auxiliary circuit.Because second multicircuit switch 112 and first multicircuit switch, 108 shared identical multipath conversion chips in this embodiment, so the output of this multipath conversion chip is connected to first emitter follower 106 and second emitter follower 114, wherein, first emitter follower 106 carries out voltage follow and second emitter follower 114 carries out current following.The output of first emitter follower 106 is connected to 108 pairs of voltage signals of the first electronic commutation switch and carries out rectification, in this embodiment, the first electronic commutation switch 108 comprises two amplifiers and auxiliary current and a control chip, is responsible for signal is discerned and deflection.The output of second emitter follower 114 is connected to 116 pairs of current signals of the second electronic commutation switch and carries out rectification, owing to converted voltage signal at current signal before, so the second electronic commutation switch 116 has identical circuit with the first electronic commutation switch 108.The output of the first electronic commutation switch 108 and the second electronic commutation switch 116 all is connected to D/A converting circuit 118.Undertaken being transferred to processor after the discretize by D/A converting circuit 118.
In circuit shown in Figure 2, voltage signal acquisition and current signal collection change input voltage and input current into less signal respectively, can be used by the circuit of back.It is the processing of back circuit for convenience that current signal is converted to voltage signal.Multi-channel conversion circuit is exactly at U with signal
A, I
AAnd U
B, I
BAnd U
C, I
CBetween switch, these three groups of data of time sharing sampling can reduce the burden of hardware and chip like this.Voltage signal is followed with the current signal follow circuit can help improving sampling precision with the signal stabilization of input.Voltage signal rectification and current signal rectification are that the negative half-cycle signal with AC signal is reversed to positive signal.So positive signal will adopt this circuit because analog to digital converter commonly used can only be sampled.This circuit is two input ends of original AC signal and anti-phase AC signal input electronic switch, then the square wave that produces by original AC signal control electronic switch select positive in two input ends one for output, be connected to analog to digital converter.Simultaneously the square wave that is produced by original AC signal also is input to chip and can knows current positive half cycle or the negative half period of being input as like this.Design so cleverly can be saved hardware, and the electronic switch of selecting for use simultaneously is easy to use higher precision again.
Adopted technical scheme of the present invention, used multi-way switch can reduce hardware, the waveform reverse circuit has reasonable performance simultaneously, for satisfying precision, plays very big effect.The reverse signal of the inside can be used to judge the polarity of electric current and voltage again simultaneously, and is easy to use.
Claims (5)
1. a signal sample circuit that is used for electric quantity monitor is characterized in that, comprising:
Bleeder circuit links to each other with the power supply input, comprises three input ends, gathers three-phase voltage respectively;
First multicircuit switch switches between the three-phase voltage of being gathered, and realizes the time sharing sampling of three-phase voltage;
First emitter follower links to each other with described first multicircuit switch;
The first electronic commutation switch, link to each other with described first emitter follower, comprise a waveform turner in the described first electronic commutation switch, when described waveform turner is between 0～180 degree at input signal, pass through input signal, when input signal is between 180～360 degree, turn over turnback signal afterwards by input signal;
Current transformer links to each other with the power supply input, comprises three input ends, gathers three-phase current respectively;
Second multicircuit switch switches between the three-phase current of being gathered, and realizes the time sharing sampling of three-phase current, and described second multicircuit switch also is converted to voltage signal with current signal;
Second emitter follower links to each other with described second multicircuit switch;
The second electronic commutation switch, link to each other with described second emitter follower, comprise a waveform turner in the described second electronic commutation switch, when described waveform turner is between 0～180 degree at input signal, pass through input signal, when input signal is between 180～360 degree, turn over turnback signal afterwards by input signal;
Digital to analog converter links to each other with the output of the described first and second electronic commutation switches, outputs to processor after the output discretize with first, second electronic commutation switch.
2. the signal sample circuit that is used for electric quantity monitor as claimed in claim 1 is characterized in that described bleeder circuit also comprises four-input terminal, links to each other with ground wire.
3. the signal sample circuit that is used for electric quantity monitor as claimed in claim 1 is characterized in that, described bleeder circuit comprises that the TVS transient voltage suppresses diode.
4. the signal sample circuit that is used for electric quantity monitor as claimed in claim 1 is characterized in that, described second multicircuit switch and described first multicircuit switch use the public circuit of part.
5. the signal sample circuit that is used for electric quantity monitor as claimed in claim 4 is characterized in that, described second multicircuit switch and described first multicircuit switch use public multipath conversion chip; Wherein, described first multicircuit switch only comprises this multipath conversion chip, and described second multicircuit switch also comprises a current-to-voltage converting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024204 CN1654965A (en) | 2005-03-04 | 2005-03-04 | Signal sampling circuit for electric quantity monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024204 CN1654965A (en) | 2005-03-04 | 2005-03-04 | Signal sampling circuit for electric quantity monitor |
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| CN 200510024204 Pending CN1654965A (en) | 2005-03-04 | 2005-03-04 | Signal sampling circuit for electric quantity monitor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590602A (en) * | 2012-02-13 | 2012-07-18 | 西安爱邦电气有限公司 | Signal processing method by adopting public processing circuit during collection of alternating-current voltage and current |
| CN104965116A (en) * | 2015-06-29 | 2015-10-07 | 昆明电器科学研究所 | Instrument electric quantity signal collection circuit board |
| CN105572465A (en) * | 2015-12-24 | 2016-05-11 | 刘志海 | Electric supply power parameter detection system |
| CN113484697A (en) * | 2021-05-19 | 2021-10-08 | 北京宏优科技发展有限公司 | Insulator leakage analysis system and method |
| CN113484696A (en) * | 2021-05-19 | 2021-10-08 | 北京宏优科技发展有限公司 | Intelligent insulator flashover analysis system |
-
2005
- 2005-03-04 CN CN 200510024204 patent/CN1654965A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590602A (en) * | 2012-02-13 | 2012-07-18 | 西安爱邦电气有限公司 | Signal processing method by adopting public processing circuit during collection of alternating-current voltage and current |
| CN104965116A (en) * | 2015-06-29 | 2015-10-07 | 昆明电器科学研究所 | Instrument electric quantity signal collection circuit board |
| CN105572465A (en) * | 2015-12-24 | 2016-05-11 | 刘志海 | Electric supply power parameter detection system |
| CN113484697A (en) * | 2021-05-19 | 2021-10-08 | 北京宏优科技发展有限公司 | Insulator leakage analysis system and method |
| CN113484696A (en) * | 2021-05-19 | 2021-10-08 | 北京宏优科技发展有限公司 | Intelligent insulator flashover analysis system |
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