CN2321531Y - Rectifying control equipment for high-voltage electrostatic dust removing - Google Patents
Rectifying control equipment for high-voltage electrostatic dust removing Download PDFInfo
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- CN2321531Y CN2321531Y CN 97230338 CN97230338U CN2321531Y CN 2321531 Y CN2321531 Y CN 2321531Y CN 97230338 CN97230338 CN 97230338 CN 97230338 U CN97230338 U CN 97230338U CN 2321531 Y CN2321531 Y CN 2321531Y
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Abstract
The utility model relates to rectification control equipment used for the high voltage electrostatic dust removal. A spark detection device is mainly composed of a synchronous pulse circuit, a monostable circuit, an isolation amplifying circuit, a crest value detector circuit, a sample holding circuit, a comparator, and a pulse expander circuit. Because the front half of the crest value is compared with the next half of the crest value, the comparative level can always track the variation of the feedback signal of an electric field, and the tracking sensitivity is the same at both the high end and the lower end of the voltage. So the perfection of the subsequent control characteristics can be assured.
Description
The utility model relates to a kind of high-pressure electrostatic precipitation rectification control appliance, particularly high-pressure electrostatic precipitation rectification control appliance spark checkout gear.
High-pressure electrostatic precipitation adopts electric field electric current, voltage to be fed back to control signal with the rectification control appliance more, to obtain the purpose of the highest mean value voltage.Wherein important feedback signal detection means, i.e. electric field spark detection are most important links during voltage is controlled automatically, and control appliance is directly connected to the quality of the highest mean value voltage and voltage control characteristic to the seizure and the disposal ability of spark.
The electric field of different working conditions, dust has different ratio resistance, breakdown voltage, strength of discharge, therefore needs different response control, and this just needs accommodation wide and have highly sensitive spark checkout gear to match with it.This device mainly was to produce jump signal by the RC differential to give triode amplification post processing in the past, and this device exists adaptability narrower, and the high low side sensitivity of voltage is inconsistent, the problem that debugging work load is big; The employing computer data acquiring is now also arranged, send comparative level and current feedback signal comparison method after the calculating and detect, but exist cost higher, it is relatively poor to calculate real-time, needs lead, the shortcoming of easily losing spark.
The purpose of this utility model is to provide a kind of can make that high response spark detects and the flashover blocking time is controlled from motion tracking according to the instantaneous variation of different operating modes, realize the control of optimum spark rate, the high-pressure electrostatic precipitation that reaches the highest mean value voltage of output with the rectification control appliance to overcome above-mentioned defective.
The high-pressure electrostatic precipitation that the utility model proposes comprises the spark checkout gear with the rectification control appliance, and its spark checkout gear mainly is made up of clock circuit, monostable circuit, isolating amplifier circuit, peak-detector circuit, sampling hold circuit, comparator and pulse expansion circuit.The current feedback signal of high pressure silicon rectifying transformer is by the input input of isolating amplifier circuit, the real-time current feedback signal sampling of isolating amplifier circuit brings out end and links to each other with comparator input terminal, the real-time current feedback signal comparative level output of isolating amplifier circuit is connected with the input of peak-detector circuit, the output of peak-detector circuit is connected with the input of sampling hold circuit, the output of sampling hold circuit links to each other with the input of comparator, the output of comparator is connected with the input of monostable circuit and pulse expansion circuit respectively, pulse expansion circuit output control signal, the synchronizing signal of rectifier transformer is by the input input of clock circuit, the output of clock circuit links to each other with the sampling clock input of sampling hold circuit, and the output of monostable circuit links to each other with the comparative level input with the sampling clock input of sampling hold circuit respectively.
Because the utility model is according to electric field current feedback signal waveform, adopt the first half crest value and next half-wave relatively, therefore comparative level can be followed the tracks of the variation of electric field feedback signal all the time, high-end or low side no matter at voltage, its tracking sensitivity is identical, thereby also just can guarantee the perfect of follow-up control characteristic.This spark checkout gear can effectively be differentiated the size of spark and spark energy, the scope of application is wide, highly sensitive, can make that high response spark detects and the flashover blocking time is controlled from motion tracking according to the instantaneous variation of different operating modes, thereby realize the control of optimum spark rate effectively, reach the purpose of the highest mean value voltage of output.
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is the schematic block circuit diagram of the spark checkout gear of the utility model embodiment.
Fig. 2 is the circuit diagram of the spark checkout gear of the utility model embodiment.
N1 is LM348 among the figure, and N2 is LM339, and D1 is LF398, and D3 is 555.
With reference to Fig. 1, Fig. 2, high pressure silicon rectifying transformer current feedback is divided into the two-way input after resistance R 30.Wherein one the tunnel through R33 and by V7, V9, and R34 enters the follower (isolating amplifier circuit) that the N1 operational amplifier constitutes behind protection that C9 constitutes and the filter circuit, through the end that R38 enters the N2 voltage comparator, sample as the real-time current feedback signal.
Another road is through R32 and by R31, and C8 enters by amplifier N1 behind protection that V8 constitutes and the filter circuit; V10; C11, the peak-detector circuit (being isolating amplifier circuit and peak-detector circuit) that R36 constitutes, the crest voltage of each half-wave in the taking-up current feedback signal; enter by D2 through R40; C13, R44, the sampling hold circuit that V11 constitutes; give the other end of N2 voltage comparator from R39, as the comparative level of real-time current feedback signal.
The synchronizing signal of rectifier transformer is through R20, voltage comparator N2, and the clock circuit that R21～R24 constitutes is delivered to 8 pin of sampling hold circuit D2 through the N2-1 pin, as its sampling clock.
Base during by D3555, R27, R29, C12, C0, C15, R46 constitutes the dual output monostable circuit, and the synchronizing signal that shielding N2-11 pin produces when adopting as spark signal makes sampling hold circuit stop sampling, and state before the maintenance spark is avoided adopting into the spark high level.
By RP3, V13, C14, R45, R47, the N2 comparator constitutes the pulse expansion circuit, as the control signal of spark detection circuit output, with control rear portion phase-shift trigger circuit or single-chip microcomputer spark interrupt routine, thereby reaches the purpose of controlling thyristor operating angle.
By R41, R37 resistance sets up an initial voltage for N2 comparator real-time current feedback signal comparative level, the flase drop spark of avoiding starting shooting, and cause false the sudden strain of a muscle.
During work:
(1) after normal current feedback signal (half-wave 50HZ signal) enters, in the reflection of N2-9 pin is the live signal waveform, what C11 reflected the upper end is the crest voltage of half-wave voltage signal, when the synchronizing signal zero passage, produce a pulse at the N2-1 pin and take a sample to sampling hold circuit, (getting the C11 crest voltage), at this moment the C11 peak value is the peak value of the last half-wave of zero passage, sampling holder through the comparative level port that V11 adds to the N2 comparator, remains to this level in next zero-crossing pulse arrival.What constituted so just that the N2 voltage comparator compared is the comparison of the first half crest value with back one half-wave actual waveform, and the two peak value is identical under the normal condition, N2 comparator no-output, and the circuit judges no-spark occurs.
(2) when spark discharge appears in electric field, (current feedback signal increases suddenly) is added in N2 voltage comparator both end voltage is last no-spark normal peak when spark is arranged relatively, because of the spark peak value increases greater than normal peak and with spark.Therefore N2 counter-rotating is sent a pulse and is given stretch circuit, makes it to send the transformable control signal of a pulse width, (spark intensity is big, pulse width is wide, otherwise intensity is little, and pulse width is also little) such detection that has just realized electric field spark inspection side and spark energy size.The pulse that while N2 sends is also sent into C15 and is made the monostable circuit counter-rotating, produces the 20ms negative pulse at the D3-7 pin, shielding sampling synchronizing signal, the D3-3 pin also produces a negative pulse simultaneously, makes the C11 current potential from RP16, R17, V35 discharges, thereby reduces next comparative level value, avoids the company of generation to dodge.
(3) because this device adopts the first half crest value and next half-wave relatively, so comparative level cheats and can follow the tracks of the variation of electric field feedback signal eventually, high-end or low side no matter at voltage, and its tracking sensitivity is identical, thereby also just can guarantee the perfect of follow-up control characteristic.
Claims (1)
1, a kind of high-pressure electrostatic precipitation rectification control appliance, comprise the spark checkout gear, it is characterized in that: above-mentioned spark checkout gear is mainly by clock circuit, monostable circuit, isolating amplifier circuit, peak-detector circuit, sampling hold circuit, comparator and pulse expansion circuit are formed, current feedback signal is by the input input of isolating amplifier circuit, the real-time current feedback signal sampling of isolating amplifier circuit brings out end and links to each other with comparator input terminal, the real-time current feedback signal comparative level output of isolating amplifier circuit is connected with the input of peak-detector circuit, the output of peak-detector circuit is connected with the input of sampling hold circuit, the output of sampling hold circuit links to each other with the input of comparator, the output of comparator is connected with the input of monostable circuit and pulse expansion circuit respectively, pulse expansion circuit output control signal, synchronizing signal is by the input input of clock circuit, the output of clock circuit links to each other with the sampling clock input of sampling hold circuit, and the output of monostable circuit links to each other with the comparative level input with the sampling clock input of sampling hold circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97230338 CN2321531Y (en) | 1997-12-09 | 1997-12-09 | Rectifying control equipment for high-voltage electrostatic dust removing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97230338 CN2321531Y (en) | 1997-12-09 | 1997-12-09 | Rectifying control equipment for high-voltage electrostatic dust removing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2321531Y true CN2321531Y (en) | 1999-06-02 |
Family
ID=33942881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97230338 Expired - Fee Related CN2321531Y (en) | 1997-12-09 | 1997-12-09 | Rectifying control equipment for high-voltage electrostatic dust removing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2321531Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298230A (en) * | 2012-02-23 | 2013-09-11 | 韶阳科技股份有限公司 | Static electricity eliminating device and control circuit |
| 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 |
-
1997
- 1997-12-09 CN CN 97230338 patent/CN2321531Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298230A (en) * | 2012-02-23 | 2013-09-11 | 韶阳科技股份有限公司 | Static electricity eliminating device and control circuit |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |