CN101318251A - Negative feedback inversion type direct-current welding machine - Google Patents
Negative feedback inversion type direct-current welding machine Download PDFInfo
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- CN101318251A CN101318251A CN 200810040352 CN200810040352A CN101318251A CN 101318251 A CN101318251 A CN 101318251A CN 200810040352 CN200810040352 CN 200810040352 CN 200810040352 A CN200810040352 A CN 200810040352A CN 101318251 A CN101318251 A CN 101318251A
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Abstract
The invention relates to a negative feedback contravariant direct current welding machine, which comprises a main inverter circuit, a direct current output circuit, a detection circuit, a constant power control circuit and a pulse width control circuit and also comprise an over-voltage and over-current protection circuit and a dead space control circuit for the frequency correction which are connected with the main inverter circuit; wherein, the output of the main inverter circuit is connected with the input terminal of the direct current output circuit; the direct current output circuit comprises two output ways, one of which is connected with a welding electrode and the other of which is connected with the input terminal of the detection circuit; the output difference value signals of the detection circuit are connected with the input terminal of the constant power control circuit, the output of which is connected with the main inverter circuit by the pulse width control circuit; a negative feedback circuit which consists of the detection circuit, the constant power control circuit and the pulse width control circuit is used for adjusting the pulse widths output by the pulse width control circuit. The welding machine has stable and soft electric arc burning with small splashing in the heavy current welding, thus improving the working performance of the heavy current of the welding machine and improving the welding quality.
Description
Technical field
The present invention relates to a kind of electric welding machine, particularly a kind of negative feedback inversion type direct-current welding machine.
Background technology
The inversion direct current welding machine mostly adopts the technical scheme of constant current to obtain output external characteristic preferably both at home and abroad at present.But this kind technical scheme is when big electric current output, and along with the raising or forcing down of welding arc, the voltage between its electric arc also increases or reduces, and then the power of electric arc also increases thereupon or reduces.After electric arc was raised, because arc power strengthens, then splash also increased thereupon, unfavorable to welding, and the increasing of power, the efficient of butt welding machine and service life are all influential.
Summary of the invention
A kind of negative feedback inversion type direct-current welding machine provided by the invention has permanent power control of big electric current and the anti-function of splashing.
In order to achieve the above object, the invention provides a kind of negative feedback inversion type direct-current welding machine, comprise:
Main inverter circuit, dc output circuit, testing circuit, constant-power control circuit and pulse width control circuit; The output of main inverter circuit connects the input of dc output circuit, dc output circuit divides two-way output, one the tunnel connects welding electrode, another road connects the input of testing circuit, testing circuit output difference signal inserts the input of constant-power control circuit, and the output of constant-power control circuit is connected to main inverter circuit through the pulsewidth control circuit;
Also comprise over-voltage over-current protection circuit and frequency correction dead band control circuit that circuit connects main inverter circuit;
Main inverter circuit is made up of current rectifying and wave filtering circuit and power inversion circuit, current rectifying and wave filtering circuit is made up of secondary, some diodes, resistance, electric capacity and the inductance of transformer, and power inversion circuit is made up of elementary, some igbts, resistance and the electric capacity of transformer.
Constant-power control circuit is made of some multipliers, and this multiplier comprises some triodes, comparator, diode, resistance and electric capacity, and pulse-width control signal of constant-power control circuit output is delivered to the input of pulse width control circuit.
Pulse width control circuit is made up of control integrated circuit, some resistance, electric capacity and diode, and high-frequency driving signal of pulse width control circuit output is delivered to main inverter circuit.
Testing circuit is made up of comparator, electric current and voltage sample circuit and electric current and voltage set-point circuit, the output of electric current and voltage sample circuit and electric current and voltage set-point circuit connects the input of comparator respectively, and the output of comparator circuit is respectively the input that constant-power control circuit provides a difference signal;
Over-voltage over-current protection circuit is made up of some triodes, resistance and electric capacity, when overtension or electric current are excessive, cut off the work of main inverter circuit, thereby protects electric welding machine can not damage because of immediate current is excessive conscientiously;
Frequency correction dead band control circuit is made up of some triodes and resistance, output pulse frequency is regulated in variation with line voltage automatically, keep output voltage not produce too big variation because of raising significantly of electrical network input voltage, when also having avoided line voltage to raise, output pulse dead band is strengthened relatively, and the inversion utmost point produces common conducting and damages device;
Behind three-phase alternating current process current rectifying and wave filtering circuit rectifying and wave-filtering, the DC voltage of output is reverse into high frequency square wave voltage by power inversion circuit, dc output circuit adopts centre cap formula way of full-wave rectification, the high frequency square wave voltage rectification is become unidirectional stable direct current output, for welding, and the negative feedback loop that constitutes by testing circuit, constant-power control circuit and pulse width control circuit, at output current greater than 200A, when arc voltage is higher than normal voltage, be used to regulate the pulse width of pulse width control circuit output;
The present invention is when big electric current welding, arc burning is stable, soft, it is little to splash, and the performance when having improved the big current work of welding machine has improved welding quality.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Followingly specify better embodiment of the present invention according to Fig. 1:
As shown in Figure 1, the invention provides a kind of negative feedback inversion type direct-current welding machine, comprise:
Main inverter circuit 101, dc output circuit 102, testing circuit 103, constant-power control circuit 104 and pulse width control circuit 105; The output of main inverter circuit 101 connects the input of dc output circuit 102, dc output circuit two-way output in 102 fens, one the tunnel connects welding electrode, another road connects the input of testing circuit 103, testing circuit 103 output difference signals insert the input of constant-power control circuit 104, and the output of constant-power control circuit 104 is connected to main inverter circuit 101 through pulsewidth control circuit 105;
Also comprise over-voltage over-current protection circuit 106 and frequency correction dead band control circuit 107 that circuit connects main inverter circuit 101;
Main inverter circuit 101 is made up of current rectifying and wave filtering circuit and power inversion circuit, current rectifying and wave filtering circuit is made up of secondary, some diodes, resistance, electric capacity and the inductance of transformer, and power inversion circuit is made up of elementary, some igbts, resistance and the electric capacity of transformer.In the present embodiment, power inversion circuit adopts the semibridge system power inversion circuit.
Constant-power control circuit 104 is made of some multipliers, and this multiplier comprises some triodes, comparator, diode, resistance and electric capacity, and pulse-width control signal of constant-power control circuit output is delivered to the input of pulse width control circuit.
Pulse width control circuit 105 is made up of control integrated circuit, some resistance, electric capacity and diode, and high-frequency driving signal of pulse width control circuit output is delivered to main inverter circuit.
Testing circuit 103 is made up of comparator, electric current and voltage sample circuit and electric current and voltage set-point circuit, the output of electric current and voltage sample circuit and electric current and voltage set-point circuit connects the input of comparator respectively, and the output of comparator circuit is respectively the input that constant-power control circuit provides a difference signal;
Over-voltage over-current protection circuit 106 is made up of some triodes, resistance and electric capacity, when overtension or electric current are excessive, cut off the work of main inverter circuit, thereby protects electric welding machine can not damage because of immediate current is excessive conscientiously;
Frequency correction dead band control circuit 107 is made up of some triodes and resistance, output pulse frequency is regulated in variation with line voltage automatically, keep output voltage not produce too big variation because of raising significantly of electrical network input voltage, when also having avoided line voltage to raise, output pulse dead band is strengthened relatively, and the inversion utmost point produces common conducting and damages device;
Behind three-phase alternating current process current rectifying and wave filtering circuit rectifying and wave-filtering, the DC voltage of output is reverse into high frequency square wave voltage by power inversion circuit, dc output circuit adopts centre cap formula way of full-wave rectification, the high frequency square wave voltage rectification is become unidirectional stable direct current output, for welding, and the negative feedback loop that constitutes by testing circuit, constant-power control circuit and pulse width control circuit, at output current greater than 200A, when arc voltage is higher than normal voltage, be used to regulate the pulse width of pulse width control circuit output;
The size of welding current is by the pulsewidth size decision of 20KHz high frequency square wave voltage, the size of its pulsewidth is determined by the switch duty time ratio of the drive igbt that pulse width control circuit produces, can guarantee that its power output is constant thereby control pulsewidth effectively.
Claims (10)
1. a negative feedback inversion type direct-current welding machine is characterized in that, comprises:
Main inverter circuit (101), dc output circuit (102), testing circuit (103), constant-power control circuit (104) and pulse width control circuit (105);
The output of main inverter circuit (101) connects the input of dc output circuit (102), dc output circuit (102) divides two-way output, one the tunnel connects welding electrode, another road connects the input of testing circuit (103), testing circuit (103) output difference signal inserts the input of constant-power control circuit (104), and the output of constant-power control circuit (104) is connected to main inverter circuit (101) through pulsewidth control circuit (105);
Also comprise over-voltage over-current protection circuit (106) and frequency correction dead band control circuit (107) that circuit connects main inverter circuit (101);
Testing circuit (103), constant-power control circuit (104) and pulse width control circuit (105) constitute negative feedback loop, greater than 200A, when arc voltage is higher than normal voltage, are used to regulate the pulse width of pulse width control circuit (105) output at output current.
2. negative feedback inversion type direct-current welding machine as claimed in claim 1 is characterized in that, described main inverter circuit (101) is made up of current rectifying and wave filtering circuit and power inversion circuit; Described current rectifying and wave filtering circuit is made up of secondary, some diodes, resistance, electric capacity and the inductance of transformer, and power inversion circuit is made up of elementary, some igbts, resistance and the electric capacity of transformer.
3. negative feedback inversion type direct-current welding machine as claimed in claim 3 is characterized in that, described power inversion circuit adopts the semibridge system power inversion circuit, the output high frequency square wave voltage.
4. negative feedback inversion type direct-current welding machine as claimed in claim 1, it is characterized in that, described constant-power control circuit (104) is made of some multipliers, this multiplier comprises some triodes, comparator, diode, resistance and electric capacity, and pulse-width control signal of constant-power control circuit output is delivered to the input of pulse width control circuit.
5. negative feedback inversion type direct-current welding machine as claimed in claim 1, it is characterized in that, described pulse width control circuit (105) is made up of control integrated circuit, some resistance, electric capacity and diode, and high-frequency driving signal of pulse width control circuit output is delivered to main inverter circuit.
6. negative feedback inversion type direct-current welding machine as claimed in claim 1, it is characterized in that, described testing circuit (103) is made up of comparator, electric current and voltage sample circuit and electric current and voltage set-point circuit, the output of electric current and voltage sample circuit and electric current and voltage set-point circuit connects the input of comparator respectively, and the output of comparator circuit is respectively the input that constant-power control circuit provides a difference signal.
7. negative feedback inversion type direct-current welding machine as claimed in claim 1 is characterized in that, described dc output circuit (102) adopts centre cap formula way of full-wave rectification, and the high frequency square wave voltage rectification is become unidirectional stable direct current output.
8. as one of any described negative feedback inversion type direct-current welding machine among the claim 1-8, it is characterized in that, the size of described welding current is by the pulsewidth size decision of 20KHz high frequency square wave voltage, the size of its pulsewidth is determined by the switch duty time ratio of the drive igbt that pulse width control circuit (105) produces, can guarantee that its power output is constant thereby control pulsewidth effectively.
9. negative feedback inversion type direct-current welding machine as claimed in claim 1; it is characterized in that; described over-voltage over-current protection circuit (106) is made up of some triodes, resistance and electric capacity; when overtension or electric current are excessive; cut off the work of main inverter circuit, thereby protect electric welding machine can not damage conscientiously because of immediate current is excessive.
10. negative feedback inversion type direct-current welding machine as claimed in claim 1, it is characterized in that, described frequency correction dead band control circuit (107) is made up of some triodes and resistance, output pulse frequency is regulated in variation with line voltage automatically, keep output voltage not produce too big variation because of raising significantly of electrical network input voltage, when also having avoided line voltage to raise, output pulse dead band is strengthened relatively, and the inversion utmost point produces common conducting and damages device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810040352 CN101318251A (en) | 2008-07-08 | 2008-07-08 | Negative feedback inversion type direct-current welding machine |
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| CN 200810040352 CN101318251A (en) | 2008-07-08 | 2008-07-08 | Negative feedback inversion type direct-current welding machine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898270A (en) * | 2010-08-12 | 2010-12-01 | 深圳市华意隆实业发展有限公司 | Inverter type alternative current medium frequency electric arc welding machine |
| CN102218582A (en) * | 2010-04-16 | 2011-10-19 | 深圳市佳士科技股份有限公司 | Submerged arc welding current pulse control circuit |
| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN103580572A (en) * | 2012-08-06 | 2014-02-12 | 中国北车股份有限公司大连电力牵引研发中心 | Constant power control method and device, and constant power traction drive system |
| CN104117758A (en) * | 2013-04-24 | 2014-10-29 | 贺杰 | Electronic inverter welding machine and manufacturing method thereof |
| CN104475925A (en) * | 2014-10-28 | 2015-04-01 | 上海空间推进研究所 | Argon-arc welding intelligent current control method for attitude-control engine |
| CN110666292A (en) * | 2019-09-05 | 2020-01-10 | 上海沪工焊接集团股份有限公司 | Inverter welding machine narrow pulse width peak current control method and circuit |
-
2008
- 2008-07-08 CN CN 200810040352 patent/CN101318251A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102218582A (en) * | 2010-04-16 | 2011-10-19 | 深圳市佳士科技股份有限公司 | Submerged arc welding current pulse control circuit |
| CN102218582B (en) * | 2010-04-16 | 2014-01-29 | 深圳市佳士科技股份有限公司 | Submerged arc welding current pulse control circuit |
| CN101898270A (en) * | 2010-08-12 | 2010-12-01 | 深圳市华意隆实业发展有限公司 | Inverter type alternative current medium frequency electric arc welding machine |
| CN101898270B (en) * | 2010-08-12 | 2011-12-14 | 深圳华意隆电气股份有限公司 | Inverter type alternative current medium frequency electric arc welding machine |
| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN102794547B (en) * | 2012-08-04 | 2014-10-29 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN103580572A (en) * | 2012-08-06 | 2014-02-12 | 中国北车股份有限公司大连电力牵引研发中心 | Constant power control method and device, and constant power traction drive system |
| CN103580572B (en) * | 2012-08-06 | 2016-05-04 | 中国北车股份有限公司 | Constant-power control method, device and permanent power traction drive system |
| CN104117758A (en) * | 2013-04-24 | 2014-10-29 | 贺杰 | Electronic inverter welding machine and manufacturing method thereof |
| CN104475925A (en) * | 2014-10-28 | 2015-04-01 | 上海空间推进研究所 | Argon-arc welding intelligent current control method for attitude-control engine |
| CN104475925B (en) * | 2014-10-28 | 2016-08-24 | 上海空间推进研究所 | Attitude control engine argon arc welding welding current intelligent control method |
| CN110666292A (en) * | 2019-09-05 | 2020-01-10 | 上海沪工焊接集团股份有限公司 | Inverter welding machine narrow pulse width peak current control method and circuit |
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Open date: 20081210 |