CN1152467C - Method for compensation of equal section scale-checking of welding power source network voltage undoluation - Google Patents
Method for compensation of equal section scale-checking of welding power source network voltage undoluation Download PDFInfo
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- CN1152467C CN1152467C CNB021122644A CN02112264A CN1152467C CN 1152467 C CN1152467 C CN 1152467C CN B021122644 A CNB021122644 A CN B021122644A CN 02112264 A CN02112264 A CN 02112264A CN 1152467 C CN1152467 C CN 1152467C
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Abstract
The present invention relates to a method for the compensation of the equal section table lookup of welding power source network voltage undulation. The method divides network voltage rated value undulation into a plurality of sections in the range from-15% to +15%, and the network voltage rated value undulation can be divided into 16 sections and 32 sections; each section corresponds to a value needing correcting of controlled silicon of main loop power. When a digital signal processor obtains a network voltage undulation direct current signal via A/D conversion, searches a corresponding network voltage undulation phase correction value of phase shift in the corresponding section via a table lookup routine and carries out plus or minus treatment with the shift phase value set by the original software of the digital signal processor, and the treated control signal directly drives to weld the controlled silicon of the main loop power via photoelectric isolation. The method has substantive characteristics and obvious progresses, and avoids a network voltage compensation circuit composed of complicated analog devices; the control circuit is simple; the method greatly enhances reliability, has stable digitized treatment process and ensures control precision.
Description
Technical field: what the present invention relates to is the compensation method of a kind of source of welding current voltage ripple of power network, and particularly a kind of method for compensation of equal section scale-checking of welding power source network voltage undoluation belongs to welding technology field.
Background technology: the fluctuation of line voltage is the indeterminable problem of power industry, but certain fluctuation range is arranged by standard, be generally load voltage value-the 15%-+15% scope in the fluctuation, in addition, the difference of peak of power consumption and electricity consumption the lowest point different time sections line voltage is also very big in enterprise's electrical network, therefore in source of welding current Circuit Design, weld the stable of stablizing of output loop and welding job parameter, the compensation tache of line voltage must be set for assurance.Find that by literature search Liu Zuoying writes articles " CO at " electric welding machine " on 2000 the 11 phase 32-33 pages or leaves
2The net voltage fluctuation of gas shielded welding machine compensates "; the voltage ripple of power network sample circuit that this article proposition adopts traditional source of welding current voltage ripple of power network compensation method promptly to adopt analogue device to form; it is output as analog signal; with this analog signal and adding up that the given signal of controlling the analog control circuit that welds output loop increases or subtracts; to reach the signal of Correction and Control welding main circuit power device, as revising the size of main circuit power thyristor operating angle in the controllable silicon welding power source.This voltage ripple of power network compensation method is very outstanding method in theory, can real-Time Compensation, but the voltage ripple of power network compensating circuit that in fact this employing analog element is formed be subjected to ambient temperature and components and parts conforming influence very big, this analogue device when temperature when 25 ℃ change to 70 ℃, the working point of analogue device itself will drift about a lot, the voltage ripple of power network compensation does not compensate the analogue device operating point drift toward contact, and therefore this voltage ripple of power network compensating action is extremely limited.
Summary of the invention: the present invention is directed to the deficiencies in the prior art and defective, a kind of method for compensation of equal section scale-checking of welding power source network voltage undoluation is provided, make application of the present invention avoid the voltage fluctuation compensating circuit that complicated analogue device constitutes in the prior art, improved the control precision of control circuit.Line voltage is powered with exchange way, its voltage is in fluctuation status, generally be controlled at rated value-the 15%-+15% scope between, enterprise's electrical network also can be unbalanced because of the unbalanced or a certain urban distribution network electricity consumption of electricity consumption, very big-difference can appear in the value up and down of mains supply voltage, even off-rating-the 15%-+15% scope outside, adopt digitized five equilibrium section scale-checking mode to carry out the welding output major loop that compensation of power network voltage can cause voltage ripple of power network and be stabilized in certain fluctuation range, guarantee stablizing of welding job point.
Ac grid voltage is through the secondary coil X of main transformer T1 step-down, through diode D1, D2, D3, the D4 rectification, through capacitor C 1, C2 filtering forms the very little direct current signal of ripple coefficient, this direct current signal is through voltage-stabiliser tube Z1, Z2, resistance R 1, R2 is connected with the A/D pin of digital signal processor, then, the analog signal conversion of voltage ripple of power network is become the digital signal of voltage ripple of power network by the A/D modular converter on the digital signal processor sheet, digital signal processor is inquired about by stages compensation meters such as voltage ripple of power network according to the digital signal of voltage ripple of power network through software programming, provide the phase shift phase value of main circuit power controllable silicon because of the required correction of voltage ripple of power network, then, the phase shift phase value and the main circuit power controllable silicon of this correction set the processing that the phase shift phase value adds deduct, form main circuit power silicon controlled phase shift phase value, through photoelectricity isolation drive welding power source main loop power controlled silicon, thus the output services point of the stable control source of welding current.
By stages compensation meters such as this voltage ripple of power network are made by a large amount of tests, its main core content is that line voltage rated value fluctuation is divided into 16 intervals in-15%-+15% scope, perhaps be divided into 32 intervals, each interval corresponding main circuit power silicon controlled should need the value of correction, when digital signal processor obtains the voltage ripple of power network direct current signal through the A/D conversion, by the voltage ripple of power network phase shift phase place correction value of look-up routine in a correspondence of its corresponding interval searching, again with the processing that adds deduct of the phase shift phase value of the original software set of digital signal processor, the control signal after the processing is isolated directly to drive through photoelectricity and is welded the main circuit power controllable silicon.
If for a certain reason, voltage ripple of power network is in-the 15%-+15% scope outside, the by stages such as then do not establish, only establish two and go up between super and following superzone and promptly establish one, corresponding voltage ripple of power network phase shift phase place correction value is set in these two intervals greater than+15% rated value and a interval less than-15% rated value.
The present invention has substantive distinguishing features and marked improvement, the present invention adopts digital signal processor to carry out the voltage ripple of power network compensation, digital form with software implementation carries out the compensation method of five equilibrium section scale-checking, the compensation of power network voltage circuit of having avoided complicated analogue device to constitute, its control circuit is very simple, reliability has obtained large increase, and digitized processing procedure is stable, and control precision is guaranteed.
Description of drawings: Fig. 1 control circuit example schematic of the present invention
Embodiment: as shown in Figure 1, ac grid voltage of the present invention is through the secondary coil X of main transformer T1 step-down, through diode D1, D2, D3, the D4 rectification, through capacitor C 1, C2 filtering forms the very little direct current signal of ripple coefficient, this direct current signal is through voltage-stabiliser tube Z1, Z2, resistance R 1, R2 is connected with the A/D pin of digital signal processor 3, then, the analog signal conversion of voltage ripple of power network is become the digital signal of voltage ripple of power network by the A/D modular converter on 3 of the digital signal processors, digital signal processor 3 is inquired about by stages compensation meters such as voltage ripple of power network according to the digital signal of voltage ripple of power network through software programming, provide the phase shift phase value of main circuit power controllable silicon 2 because of the required correction of voltage ripple of power network, then, the phase shift phase value and the main circuit power controllable silicon 2 of this correction set the processing that the phase shift phase value adds deduct, form the phase shift phase value of main circuit power controllable silicon 2, isolate 1 through photoelectricity and drive welding power source main loop power controlled silicon 2, the output services point of the stable control source of welding current.
Below realize purpose of the present invention by the example of a control circuit, the formation of control circuit and connected mode are: the anode of diode D1, the negative electrode of D3 is connected with a end of the secondary coil X of main transformer T1, the anode of diode D2, the negative electrode of D4 is connected with the b end of the secondary coil X of main transformer T1, diode D1, the anode of the anode of D2 and electrochemical capacitor C1, capacitor C 2, the negative electrode of voltage-stabiliser tube Z1 connects, the anode of voltage-stabiliser tube Z1 is connected with resistance R 1, resistance R 1, R2, the negative electrode of voltage-stabiliser tube Z1 is connected diode D3 with the A/D pin of digital signal processor 3, the anode of D4, the negative terminal of electrochemical capacitor C1, capacitor C 2, resistance R 2, the anode of voltage-stabiliser tube Z2 and ground connection GND.
Claims (3)
1, a kind of method for compensation of equal section scale-checking of welding power source network voltage undoluation, it is characterized in that line voltage rated value fluctuation is divided into 16 intervals in-15%-+15% scope, perhaps be divided into 32 intervals, the value that should need correction of each interval corresponding main circuit power controllable silicon (2), when digital signal processor (3) obtains the voltage ripple of power network direct current signal through the A/D conversion, by the voltage ripple of power network phase shift phase place correction value of look-up routine in a correspondence of its corresponding interval searching, again with processings that add deduct of the phase shift phase value of the original software set of digital signal processor (3), the control signal after the processing is isolated (1) through photoelectricity and is directly driven and weld main circuit power controllable silicon (2).
2, this method for compensation of equal section scale-checking of welding power source network voltage undoluation according to claim 1, it is characterized in that voltage ripple of power network be in-the 15%-+15% scope outside, the by stages such as then do not establish, only establish two and go up between super and following superzone and promptly establish one, corresponding voltage ripple of power network correction phase shift phase place correction value is set in these two intervals greater than+15% rated value and a interval less than-15% rated value.
3, this method for compensation of equal section scale-checking of welding power source network voltage undoluation according to claim 1, it is characterized in that ac grid voltage is through the secondary coil X of main transformer T1 step-down, through diode D1, D2, D3, the D4 rectification, through capacitor C 1, C2 filtering forms the very little direct current signal of ripple coefficient, this direct current signal is through voltage-stabiliser tube Z1, Z2, resistance R 1, R2 is connected with the A/D pin of digital signal processor (3), then, the analog signal conversion of voltage ripple of power network is become the digital signal of voltage ripple of power network by the A/D modular converter on digital signal processor (3) sheet, digital signal processor (3) is inquired about by stages compensation meters such as voltage ripple of power network according to the digital signal of voltage ripple of power network through software programming, provide the phase shift phase value of main circuit power controllable silicon (2) because of the required correction of voltage ripple of power network, then, the phase shift phase value of this correction and main circuit power controllable silicon (2) set the processing that the phase shift phase value adds deduct, form the phase shift phase value of main circuit power controllable silicon (2), isolate (1) through photoelectricity and drive welding power source main loop power controlled silicon (2), the output services point of the stable control source of welding current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021122644A CN1152467C (en) | 2002-06-27 | 2002-06-27 | Method for compensation of equal section scale-checking of welding power source network voltage undoluation |
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| CNB021122644A CN1152467C (en) | 2002-06-27 | 2002-06-27 | Method for compensation of equal section scale-checking of welding power source network voltage undoluation |
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| CN1385955A CN1385955A (en) | 2002-12-18 |
| CN1152467C true CN1152467C (en) | 2004-06-02 |
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| CNB021122644A Expired - Fee Related CN1152467C (en) | 2002-06-27 | 2002-06-27 | Method for compensation of equal section scale-checking of welding power source network voltage undoluation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109128454A (en) * | 2018-08-24 | 2019-01-04 | 上海沪工焊接集团股份有限公司 | The improvement method of welding machine input voltage precision |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160058855A (en) * | 2013-09-17 | 2016-05-25 | 파커비전, 인크. | Method, apparatus and system for rendering an information bearing function of time |
| CN105717958B (en) * | 2016-03-31 | 2017-12-19 | 深圳市合信自动化技术有限公司 | A kind of intelligent power output intent and module based on controllable silicon |
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2002
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109128454A (en) * | 2018-08-24 | 2019-01-04 | 上海沪工焊接集团股份有限公司 | The improvement method of welding machine input voltage precision |
| CN109128454B (en) * | 2018-08-24 | 2021-04-20 | 上海沪工焊接集团股份有限公司 | Method for improving input voltage precision of welding machine |
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| CN1385955A (en) | 2002-12-18 |
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