CN101470137A - Electric field spark detection circuit of electrostatic precipitator - Google Patents
Electric field spark detection circuit of electrostatic precipitator Download PDFInfo
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- CN101470137A CN101470137A CNA2007101441251A CN200710144125A CN101470137A CN 101470137 A CN101470137 A CN 101470137A CN A2007101441251 A CNA2007101441251 A CN A2007101441251A CN 200710144125 A CN200710144125 A CN 200710144125A CN 101470137 A CN101470137 A CN 101470137A
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- operational amplifier
- electric field
- comparer
- chip microcomputer
- digital
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Abstract
The invention discloses an electric field spark detection circuit for electrostatic dust cleaner, for resolving the problems of prior detection circuit which adopts current sampling signals to cause failure detection on small spark of electric field. The invention adopts an operational amplifier (5) connected with a sampling voltage and connected with a SCM (1) via an analogue/digital converter (2), wherein the a comparer (3) is connected between the output end of the operational amplifier (5) and the SCM (1) via a resistor R6(4), the cathode of the comparer (3) is connected with the output end of the operational amplifier (7) via a resistor R7(6), the anode of the operational amplifier (7) is connected with the digital/analogue converter (8) connected with the SCM (1), and the SCM (1) is connected with a power supply monitor circuit (9). The electric field spark detection circuit is used to detect electric field spark discharge of electrostatic dust cleaner, having accurate, on-time and no-missing detection, reliable and stable performance and strong interference resistance.
Description
Under technical field the present invention relates to a kind ofly inspect the electric field spark detection circuit of electrostatic precipitator that circuit is formed by single-chip microcomputer, analog to digital converter, digital to analog converter, operational amplifier, comparer and power supply.
In the present prior art of background technology, electrostatic precipitator electric field cremate testing circuit is made up of single-chip microcomputer, analog to digital converter, digital to analog converter, operational amplifier, comparer and power supply monitoring circuit, the analog to digital converter amount of establishing is joined with comparer negative terminal and operational amplifier N1B anode respectively with sample rate current operational amplifier N1C output terminal in single-chip microcomputer inside.The output terminal of the anode of comparer and operational amplifier N5C joins.The anode of operational amplifier is connected with single-chip microcomputer through digital to analog converter, and output terminal and the single-chip microcomputer of operational amplifier NIB join, and its principle of work is: sample rate current I
2Enter operational amplifier penetrate with, the one tunnel outputs to the negative terminal of comparer: another road outputs to the anode of operational amplifier NIB, through N1B, R
10, R
1, V
3, C
2To single-chip microcomputer, after the processing of single-chip microcomputer internal mode number converter, output to digital to analog converter in the peak value sampling circuit of forming, be converted into the anode of delivering to operational amplifier N5C behind the voltage signal, after amplifier, output to the anode of comparer.When the electric field flashing, sample rate current I
2Upper punch occurs, its peak value surpasses the relatively current potential of the direct current ripple of usefulness.Therefore relatively export negative pulse, make the single-chip microcomputer picked up signal.When electric field generation sparklet.Its peak value does not surpass the relatively current potential of the direct current ripple of usefulness, more can not export negative pulse, does not just detect spark, and omission easily takes place.
Summary of the invention the purpose of this invention is to provide a kind of electric field spark detection circuit of electrostatic precipitator, and it compared with prior art can utilize the electric field spark sparking voltage characteristic of reduction rapidly, detects spark.
For achieving the above object, electric field spark detection circuit of electrostatic precipitator of the present invention, by single-chip microcomputer, analog to digital converter, digital to analog converter, operational amplifier, comparer and power supply monitoring circuit are formed, the operational amplifier that is connected with sampled voltage joins through analog to digital converter and single-chip microcomputer, between the output terminal of operational amplifier and single-chip microcomputer, comparer is arranged through resistance R 6 cross-over connections, the negative terminal of comparer joins through the output terminal of resistance R 7 with operational amplifier, the anode of operational amplifier is connected with digital to analog converter, digital to analog converter and single-chip microcomputer join, and single-chip microcomputer also joins with power supply monitoring circuit.
The resistance of resistance R 7 is that 95～105 ohm, the resistance of resistance R 6 are 95～105 ohm.
Principle of work of the present invention is as follows: sampled voltage passes through resistance R after operational amplifier amplifies
4Deliver to analog to digital converter and convert data-signal to, after handling by single-chip microcomputer again, convert voltage signal to, amplify resistance R through operational amplifier by digital to analog converter
7Deliver to the negative terminal of comparer, compare with the signal (promptly being input to the signal of the anode of comparer) after amplifying from operational amplifier.When spark discharge, sampled voltage is less than reference voltage, comparer produces undersuing, single-chip microcomputer detects this voltage signal negative edge, and produce interruption, carry out corresponding software, at the pin output voltage waveforms signalisation miscellaneous equipment of single-chip microcomputer, light emitting diode is bright simultaneously, and expression detects spark.
Since when the present invention catches the electric field spark discharge, the feature that voltage reduces rapidly.Sampled voltage and reference voltage when adopting spark discharge compare, if the sampled voltage during spark discharge is just thought to detect spark less than reference voltage; Otherwise, just think not detect spark.The omission phenomenon can not take place in this circuit, and when reality was used this circuit, antijamming capability is strong, and was stable and reliable for performance.
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments for description of drawings.
Fig. 1 is the wiring diagram of electric field spark detection circuit of electrostatic precipitator of the present invention:
The oscillogram of circuit comparative voltage shown in Fig. 2 Fig. 1.
Among the figure: 1, single-chip microcomputer 2, analog to digital converter 3, comparer 4, resistance R
6.5, operational amplifier 6, resistance R
7.7, operational amplifier 8, digital to analog converter 9, power supply monitoring circuit.
Embodiment electric field spark detection circuit of electrostatic precipitator shown in Figure 1, form by single-chip microcomputer (1), analog to digital converter (2), digital to analog converter (8), operational amplifier, comparer (3) and power supply monitoring circuit (9), the operational amplifier that is connected with sampled voltage (5) joins through analog to digital converter (2) and single-chip microcomputer (1), through resistance R 6 (4) cross-over connections comparer (3) is arranged between the output terminal of operational amplifier (5) and single-chip microcomputer (1), the negative terminal of comparer (3) is through resistance R
7(6) output terminal with operational amplifier (7) joins, and the anode of operational amplifier (7) is connected with digital to analog converter (8), and digital to analog converter (8) joins with single-chip microcomputer (1), and single-chip microcomputer (1) also joins with power supply monitoring circuit (9); Resistance R
7(6) resistance is 95～105 ohm, resistance R
6(4) resistance is 95～105 ohm.
Sampled voltage is delivered to analog to digital converter (2) by resistance R 4 and is converted data-signal to after operational amplifier (5) amplifies, and after being handled by single-chip microcomputer (1), converts voltage signal to by digital to analog converter (8) again, amplifies resistance R through operational amplifier (7)
7(6) deliver to the negative terminal of comparer (3), compare with the signal (promptly being input to the signal of the anode of comparer (3)) after amplifying from operational amplifier (5).When spark discharge, sampled voltage is less than reference voltage, comparer (3) produces undersuing, single-chip microcomputer (1) detects this voltage signal negative edge, and produce interruption, carry out corresponding software, at the pin output voltage waveforms signalisation miscellaneous equipment of single-chip microcomputer (1), light emitting diode is bright simultaneously, and expression detects spark.
In Fig. 2, U ' a is the voltage waveform of N5C output, and U ' b is the voltage waveform of N1C output, and U ' c is The voltage waveform of N6D output.
Claims (2)
1, a kind of electric field spark detection circuit of electrostatic precipitator, by single-chip microcomputer, analog to digital converter, digital to analog converter, operational amplifier, comparer and power supply monitoring circuit are formed, it is characterized in that: the operational amplifier that is connected with sampled voltage (5) joins through analog to digital converter (2) and single-chip microcomputer (1), between the output terminal of operational amplifier (5) and single-chip microcomputer (1), comparer (3) is arranged through resistance R 6 (4) cross-over connections, the negative terminal of comparer (3) joins through the output terminal of resistance R 7 (6) with operational amplifier (7), the anode of operational amplifier (7) is connected with digital to analog converter (8), digital to analog converter (8) joins with single-chip microcomputer (1), and single-chip microcomputer (1) also joins with power supply monitoring circuit (9).
2, electric field spark detection circuit of electrostatic precipitator according to claim 1 is characterized in that: the resistance of resistance R 7 (6) is that 95～105 ohm, the resistance of resistance R 6 (4) are 95～105 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101441251A CN101470137A (en) | 2007-12-24 | 2007-12-24 | Electric field spark detection circuit of electrostatic precipitator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101441251A CN101470137A (en) | 2007-12-24 | 2007-12-24 | Electric field spark detection circuit of electrostatic precipitator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101470137A true CN101470137A (en) | 2009-07-01 |
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ID=40827794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101441251A Pending CN101470137A (en) | 2007-12-24 | 2007-12-24 | Electric field spark detection circuit of electrostatic precipitator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101470137A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913658A (en) * | 2014-03-28 | 2014-07-09 | 中国矿业大学 | Electrical equipment failure real-time monitor system |
| CN104505809A (en) * | 2014-12-24 | 2015-04-08 | 国电南京自动化股份有限公司 | Multi-energy level spark detection system with locking function |
| CN106019108A (en) * | 2016-05-17 | 2016-10-12 | 北京华能新锐控制技术有限公司 | Flashover detection circuit and method |
| CN109490725A (en) * | 2018-11-13 | 2019-03-19 | 广西电网有限责任公司电力科学研究院 | The isolator detecting system for having active intelligent recognition function |
-
2007
- 2007-12-24 CN CNA2007101441251A patent/CN101470137A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913658A (en) * | 2014-03-28 | 2014-07-09 | 中国矿业大学 | Electrical equipment failure real-time monitor system |
| CN104505809A (en) * | 2014-12-24 | 2015-04-08 | 国电南京自动化股份有限公司 | Multi-energy level spark detection system with locking function |
| CN104505809B (en) * | 2014-12-24 | 2017-05-31 | 国电南京自动化股份有限公司 | The multiple level Spark plug optical fiber sensor system of locking function |
| CN106019108A (en) * | 2016-05-17 | 2016-10-12 | 北京华能新锐控制技术有限公司 | Flashover detection circuit and method |
| CN109490725A (en) * | 2018-11-13 | 2019-03-19 | 广西电网有限责任公司电力科学研究院 | The isolator detecting system for having active intelligent recognition function |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090701 |