CN100460123C - Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device - Google Patents
Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device Download PDFInfo
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- CN100460123C CN100460123C CNB2007101208346A CN200710120834A CN100460123C CN 100460123 C CN100460123 C CN 100460123C CN B2007101208346 A CNB2007101208346 A CN B2007101208346A CN 200710120834 A CN200710120834 A CN 200710120834A CN 100460123 C CN100460123 C CN 100460123C
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- power switch
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Abstract
The present invention discloses a super rapid exchanging method compound pulse current polarity changing arc welding power supply device used for electric arc welding, which comprises a DC power supply, a full bridge transfer circuit, a control system, a drive circuit, a parallel absorbing protecting circuit and a pulse current output circuit. The parallel absorbing protecting circuit is consists of an electrolytic condenser CE, a high frequency capacitance C and a power resistor R. The pulse current output circuit consists of a second follow current inductance LP, a fifth power switch tube TP and a second power diode DP. The DC power supply comprises an assistant DC power supply, a first DC power supply and a second DC power supply. The first DC power supply is used for providing a background current, and the second DC power supply is used for supplying a peak current Tpp, and the control system adopts a DSP processor chip. The current ascension rate of the power supply equipment output polarity changing square wave current of the present invention is not less than 50A/Mus, and the rate of descent is not less than 50A/ Mus, and the current ascension rate of the compound pulse is not less than 50A/Mus, and the current ascension rate is 10 to 15 A/ Mus, and the frequency of the compound pulse is 1kHz to 30 kHz, and the duty ratio is 10 percent to 90 percent.
Description
Technical field
The present invention relates to a kind of supply unit that is applicable to arc welding, more particularly say, be meant a kind of super speed inverting square wave composite pulse current pole-changing arc-welding power supply device, belong to modern power electronic inversion transformation technique field.
Background technology
Variable polarity welding power supply is the novel source of welding current of a kind of alternative sine wave AC and square wave alternating-current power supply, and it is mainly used in argon tungsten-arc welding and plasma arc welding (PAW) etc.In fact the Variable Polarity power supply is exactly the square wave alternating-current power supply that can distinguish independent regulation between a kind of power frequency and positive and negative half-wave current amplitude, the time ratio.Studies show that in recent years, the conversion frequency of Variable Polarity electric current are one of its important characteristic parameters.Conventional variable polarity welding power supply is subjected to all multifactor restrictions such as power supply hardware circuit design principle, its output Variable Polarity current-rising-rate and rate of descent be respectively＜5A/ μ s about, thereby the welding that can't realize exporting Variable Polarity electric current upper frequency section.Yet adopt the arc welding of the higher conversion frequency of output Variable Polarity electric current, can produce special galvanomagnetic-effect and arc-ultrasonic effect, can significantly improve welding quality.One of feasible way of realizing the welding of Variable Polarity Square-wave AC electric current upper frequency is, further improve the conversion frequency of output Variable Polarity electric current and in positive and negative hemiwave time the middle and high frequency pulse current of superposition on the waveform of constant current, then can realize the middle and high frequency super speed inverting square wave composite pulse current pole-changing welding of Variable Polarity arc welding.
In a kind of conventional Variable Polarity power circuit (as shown in Figure 3), be parallel with capacitor C between the positive pole of dc source and the negative pole, the positive pole of dc source respectively with the first power switch pipe T
1Colelctor electrode and the 3rd power switch pipe T
3Colelctor electrode connect, the negative pole of dc source respectively with the second power switch pipe T
2Emitter stage and the 4th power switch pipe T
4Emitter stage connect; The first power switch pipe T
1The emitter stage and the second power switch pipe T
2Colelctor electrode link to each other the 3rd power switch pipe T
3Emitter stage and the 4th power switch pipe T
4Colelctor electrode link to each other; Electrode is connected the 3rd power switch pipe T
3Emitter stage and the 4th power switch pipe T
4Colelctor electrode between, workpiece is connected the first power switch pipe T
1The emitter stage and the second power switch pipe T
2Colelctor electrode between; Control system is used to produce the first driving pulse sequence U
1, the second driving pulse sequence U
2, the first driving pulse sequence U
1Behind first drive circuit, act on the first power switch pipe T
1Grid and the 4th power switch pipe T
4Grid on, the second driving pulse sequence U
2Behind first drive circuit, act on the second power switch pipe T
2Grid and the 3rd power switch pipe T
3Grid on.
Summary of the invention
The purpose of this invention is to provide a kind of super speed inverting square wave composite pulse current pole-changing arc-welding power supply device that is applicable to arc welding; by be connected with holding circuit, full-bridge circuit, the pulse current output circuit of absorbing in parallel at three kinds of different dc power output ends, realize the high frequency composite type variable polarity square wave current output of various ways.
The present invention is a kind of super speed inverting square wave composite pulse current pole-changing arc-welding power supply device; include dc source, full-bridge circuit, control system, drive circuit, holding circuit, the pulse current output circuit of absorbing in parallel, the described holding circuit that absorbs in parallel is by electrochemical capacitor C
E, high frequency capacitance C and power resistor R form; Described pulse current output circuit is by the second afterflow inductance L
P, the 5th power switch pipe T
PWith the second power diode D
PForm; Described dc source includes auxiliary DC power supply, first dc source and second dc source, and first dc source is used to provide background current I
b, second dc source is used to provide peak point current I
PpControl system adopts the dsp processor chip.
The advantage of super speed inverting square wave composite pulse current pole-changing arc-welding power supply of the present invention is: (1) adopts three kinds of different dc power output ends to be connected with holding circuit, full-bridge circuit, the pulse current output circuit of absorbing in parallel, realizes the high frequency composite type variable polarity square wave current output of various ways; (2) utilization DSP control system generates and has the driving pulse sequence of certain adjustable overlapping time, has realized that high frequency composite type variable polarity square wave current does not have the current polarity conversion of dead band zero-crossing timing; (3) supply unit of the present invention has supper-fast current-rising-rate and electric current rate of descent, and its output Variable Polarity Square-wave AC current-rising-rate is 〉=50A/ μ s that rate of descent is 〉=50A/ μ s; The composite pulse current-rising-rate is 〉=50A/ μ s that rate of descent is 10～15A/ μ s, composite pulse frequency 1kHz～30kHz, dutycycle 10%～90%.
Description of drawings
Fig. 1 is the structured flowchart of super speed inverting square wave composite pulse current pole-changing arc-welding power supply of the present invention.
Fig. 2 is the compound square-wave pulse Variable Polarity of a present invention output current wave schematic diagram.
Fig. 3 is conventional Variable Polarity circuit construction of electric power block diagram.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
See also shown in Figure 1ly, the present invention is a kind of super speed inverting square wave composite pulse current pole-changing arc-welding power supply device, and dc source includes auxiliary DC power supply, first dc source and second dc source, and first dc source is used to provide background current I
b, second dc source is used to provide peak point current I
Pp, control system adopts the dsp processor chip.
In the present invention, the positive pole of first dc source and the first afterflow inductance L
b1 end connect the first afterflow inductance L
b2 ends and the first power switch pipe T
1Colelctor electrode, the 3rd power switch pipe T
3Colelctor electrode connect; The negative pole of first dc source and the second power switch pipe T
2Emitter stage, the 4th power switch pipe T
4Emitter stage connect; The first power switch pipe T
1The emitter stage and the second power switch pipe T
2Colelctor electrode link to each other the 3rd power switch pipe T
3Emitter stage and the 4th power switch pipe T
4Colelctor electrode link to each other; Electrode is connected the 3rd power switch pipe T
3Emitter stage and the 4th power switch pipe T
4Colelctor electrode between, workpiece is connected the first power switch pipe T
1The emitter stage and the second power switch pipe T
2Colelctor electrode between; The first driving pulse sequence U by the generation of DSP control system
1, the second driving pulse sequence U
3Behind first drive circuit, the first driving pulse sequence U
1Act on the first power switch pipe T
1Grid and the 4th power switch pipe T
4Grid on, the second driving pulse sequence U
2Act on the second power switch pipe T
2Grid and the 3rd power switch pipe T
3Grid on.First drive circuit can adopt traditional driving circuit structure.First dc source output, 50～70V floating voltage, 1～300A electric current.
In the present invention, the positive pole of second dc source and the second afterflow inductance L
P1 end connect the second afterflow inductance L
P2 ends respectively with the second power diode D
PAnode and the 5th power switch pipe T
PColelctor electrode connect the second power diode D
PThe negative electrode and the first afterflow inductance L
b2 ends connect; The negative pole of second dc source respectively with the 5th power switch pipe T
PEmitter stage, the negative pole of first dc source and the negative pole of auxiliary DC power supply be connected; The 3rd driving pulse sequence U by the generation of DSP control system
3Behind second drive circuit, act on the 5th power switch pipe T
PGrid on.Second drive circuit can adopt traditional driving circuit structure, and in the present invention, second drive circuit is identical with the circuit principle structure of first drive circuit.Second dc source output, 50～70V floating voltage, 1～300A electric current.
In the present invention, be parallel with electrochemical capacitor C between the positive pole of auxiliary DC power supply and the negative pole
E, high frequency capacitance C and power resistor R; Anodal and the 3rd power switch pipe T of auxiliary DC power supply
3Colelctor electrode between be connected with the first power diode D; The auxiliary DC power supply negative pole is connected the second power switch pipe T
2Emitter stage and the 4th power switch pipe T
4Emitter stage.Auxiliary DC power supply output 300～600V voltage, 0.1～5A electric current.Auxiliary DC power supply and high frequency capacitance C, electrochemical capacitor C
EWith the common spike overvoltage protection that realizes full-bridge circuit of the first power diode D, when peak voltage surpassed the voltage of auxiliary DC power supply, crest voltage will be by high frequency capacitance C and electrochemical capacitor C
EAbsorb, and the energy that absorbs can be released by power resistor R.
Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device of the present invention adopts the first afterflow inductance L
bRealized background current I
bConstant current output; Adopt the second afterflow inductance L
P, the 5th power switch pipe T
PWith the second power diode D
PThe pulse current output circuit of forming has been realized peak point current I
PpBe converted to pulse current I with fast rise rate and rate of descent
pOutput; Dc pulse current I
PbBy the first power switch pipe T
1, the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4Realize the reversal of no Dead Time, have supper-fast current-rising-rate and rate of descent simultaneously; Auxiliary DC power supply, electrochemical capacitor C
E, high frequency capacitance C and the first power diode D form the holding circuit that absorbs in parallel, guaranteed the first power switch pipe T effectively
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The operate as normal of circuit when reversal; Driving pulse sequence (the first driving pulse sequence U of DSP control system output
1, the second driving pulse sequence U
2, the 3rd driving pulse sequence U
3), the complex modulated of realization high frequency Variable Polarity Square-wave AC electric current.
Referring to shown in Figure 2, in the present invention, the peak point current I that the output of second dc source is stable
Pp, by controlling the 5th power switch pipe T
PConducting and shutoff, at the second power diode D
POn formed pulse current I
p, because the second afterflow inductance L
PExistence and adopt powerful the 5th power switch pipe T
P, thereby can obtain to have the pulse current I of fast current climbing and rate of descent
pThe background current I that the output of first dc source is stable
b, background current I
b, pulse current I
pStack in parallel back output dc pulse current I
Pb, dc pulse current I
PbTransfer to by the first device for power switching T
1, the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The bridge-type Variable Polarity change-over circuit of forming is for conversion into the Variable Polarity electric current I
f=± I
Pb, with the Variable Polarity electric current I
fSynchronously control to adjust pulse current I
pJust can obtain the Variable Polarity electric current I
fMultiple combination.For example: positive half-wave amplitude I
f=I
Pp+ I
b, negative half-wave amplitude I
f=-I
Pp-I
bPositive half-wave amplitude I
f=I
Pp+ I
b, negative half-wave amplitude I
f=-I
bPositive half-wave amplitude I
f=I
b, negative half-wave amplitude I
f=-I
Pp-I
bDeng.Fig. 2 is its output current wave schematic diagram.
Super speed inverting square wave composite pulse current pole-changing arc-welding power supply of the present invention is compared the full-bridge circuit first device for power switching T of the present invention with conventional Variable Polarity power circuit (as shown in Figure 3)
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4Do not need to be provided with the dead band guard time, utilize the first afterflow inductance L simultaneously
b, the second afterflow inductance L
POn the characteristic that can not suddenly change of electric current, accelerated the climbing and the rate of descent of climbing, rate of descent and the pulse current of Variable Polarity Square-wave AC electric current greatly.Auxiliary DC power supply and absorption holding circuit in parallel are to be provided with for the trouble free service that guarantees power-supply system, are used to absorb due to voltage spikes, prevent that the too high voltages spike from causing the damage of full-bridge circuit device for power switching.Regulate the auxiliary DC power supply output voltage, make capacitance voltage rise to a desired value, in order to avoid its influence and reduce climbing, the rate of descent of Variable Polarity electric current and pulse current.This is that the first power diode D will be open-minded in advance because when this magnitude of voltage is too small, and to the first afterflow inductance L
b, the second afterflow inductance L
PForm shunting, cause the Variable Polarity electric current I that flows to arc load (electrode)
fReduce, thereby influenced the climbing and the rate of descent of electric current greatly.
In the present invention, the first device for power switching T
1, the second power switch pipe T
2, the 3rd power switch pipe T
3, the 4th power switch pipe T
4With the 5th power switch pipe T
PThe driving pulse sequence produce by the DSP control system.The DSP control system can produce three road driving pulse sequences, i.e. the first driving pulse sequence U
1, the second driving pulse sequence U
2, the 3rd driving pulse sequence U
3The 3rd driving pulse sequence U
3Behind second drive circuit, act on the 5th power switch pipe T
PGrid, the first driving pulse sequence U
1Behind first drive circuit, act on the first device for power switching T
1Grid and the 4th power switch pipe T
4Grid, the second driving pulse sequence U
2Behind first drive circuit, act on the second power switch pipe T
2Grid and the 3rd power switch pipe T
3Grid, realize that output current does not have dead band fast polarity conversion.
The first afterflow inductance L in the present invention
b, the second afterflow inductance L
PUtilization is flow through the characteristic that electric current can not suddenly change on it and is guaranteed that output current is when carrying out reversal, output Variable Polarity Square-wave AC current-rising-rate is 〉=50A/ μ s, rate of descent for 〉=(the output current climbing and the rate of descent of conventional variable polarity welding power supply is respectively＜5A/ μ s 50A/ μ s, the present invention has improved at least 10 times with respect to the output of conventional variable polarity welding power supply, so be called ultrafast conversion; The composite pulse current-rising-rate is 〉=50A/ μ s that rate of descent is 10～15A/ μ s, composite pulse frequency 1kHz～30kHz, dutycycle 10%～90%.Auxiliary DC power supply makes high frequency capacitance C two ends remain at a suitable voltage levvl, auxiliary DC power supply, electrochemical capacitor C
E, composition such as high frequency capacitance C, power resistor R and first power diode D auxiliary protection circuit can guarantee the first device for power switching T reliably
1, the second power switch pipe T
2With the 3rd power switch pipe T
3, the 4th power switch pipe T
4The normal trouble free service of circuit when reversal.
Claims (5)
1. super speed inverting square wave composite pulse current pole-changing arc-welding power supply device that is applicable to arc welding; comprise dc source, full-bridge circuit, control system, drive circuit; it is characterized in that: also comprise holding circuit, the pulse current output circuit of absorbing in parallel, the described holding circuit that absorbs in parallel is by electrochemical capacitor C
E, high frequency capacitance C and power resistor R form; Described pulse current output circuit is by the second afterflow inductance L
P, the 5th power switch pipe T
PWith the second power diode D
PForm; Described dc source includes auxiliary DC power supply, first dc source and second dc source, and first dc source is used to provide background current I
b, second dc source is used to provide peak point current I
PpControl system adopts the dsp processor chip;
Be parallel with electrochemical capacitor C between the positive pole of auxiliary DC power supply and the negative pole
E, high frequency capacitance C and power resistor R; Anodal and the 3rd power switch pipe T of auxiliary DC power supply
3Colelctor electrode between be connected with the first power diode D; The auxiliary DC power supply negative pole is connected the second power switch pipe T
2Emitter stage and the 4th power switch pipe T
4Emitter stage;
The positive pole of first dc source and the first afterflow inductance L
b1 end connect the first afterflow inductance L
b2 ends and the first power switch pipe T
1Colelctor electrode, the 3rd power switch pipe T
3Colelctor electrode connect; The negative pole of first dc source and the second power switch pipe T
2Emitter stage, the 4th power switch pipe T
4Emitter stage connect; The first power switch pipe T
1The emitter stage and the second power switch pipe T
2Colelctor electrode link to each other the 3rd power switch pipe T
3Emitter stage and the 4th power switch pipe T
4Colelctor electrode link to each other; Electrode is connected the 3rd power switch pipe T
3Emitter stage and the 4th power switch pipe T
4Colelctor electrode between, workpiece is connected the first power switch pipe T
1The emitter stage and the second power switch pipe T
2Colelctor electrode between;
The positive pole of second dc source and the second afterflow inductance L
P1 end connect the second afterflow inductance L
P2 ends respectively with the second power diode D
PAnode and the 5th power switch pipe T
PColelctor electrode connect the second power diode D
PThe negative electrode and the first afterflow inductance L
b2 ends connect; The negative pole of second dc source respectively with the 5th power switch pipe T
PEmitter stage, the negative pole of first dc source and the negative pole of auxiliary DC power supply be connected;
The DSP control system can produce three road driving pulse sequences, i.e. the first driving pulse sequence U
1, the second driving pulse sequence U
2, the 3rd driving pulse sequence U
3The 3rd driving pulse sequence U
3Behind second drive circuit, act on the 5th power switch pipe T
PGrid, the first driving pulse sequence U
1Behind first drive circuit, act on the first device for power switching T
1Grid and the 4th power switch pipe T
4Grid, the second driving pulse sequence U
2Behind first drive circuit, act on the second power switch pipe T
2Grid and the 3rd power switch pipe T
3Grid.
2. super speed inverting square wave composite pulse current pole-changing arc-welding power supply device according to claim 1 is characterized in that: auxiliary DC power supply output 300～600V voltage, 0.1～5A electric current.
3. super speed inverting square wave composite pulse current pole-changing arc-welding power supply device according to claim 1 is characterized in that: first dc source output, 50～70V floating voltage, 1～300A electric current.
4. super speed inverting square wave composite pulse current pole-changing arc-welding power supply device according to claim 1 is characterized in that: second dc source output, 50～70V floating voltage, 1～300A electric current.
5. super speed inverting square wave composite pulse current pole-changing arc-welding power supply device according to claim 1 is characterized in that: output Variable Polarity Square-wave AC current-rising-rate is 〉=50A/ μ s that rate of descent is 〉=50A/ μ s; The composite pulse current-rising-rate is 〉=50A/ μ s that rate of descent is 10～15A/ μ s, composite pulse frequency 1～30kHz, dutycycle 10%～90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101208346A CN100460123C (en) | 2007-08-27 | 2007-08-27 | Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101208346A CN100460123C (en) | 2007-08-27 | 2007-08-27 | Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device |
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| Publication Number | Publication Date |
|---|---|
| CN101125390A CN101125390A (en) | 2008-02-20 |
| CN100460123C true CN100460123C (en) | 2009-02-11 |
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|---|---|---|---|
| CNB2007101208346A Expired - Fee Related CN100460123C (en) | 2007-08-27 | 2007-08-27 | Super speed inverting square wave composite pulse current pole-changing arc-welding power supply device |
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| JP5557238B2 (en) * | 2008-12-24 | 2014-07-23 | 株式会社ダイヘン | AC pulse arc welding control method |
| CN102218581B (en) * | 2011-04-28 | 2013-11-20 | 北京工业大学 | Composite high-frequency pulse welding system and process |
| CN102843061A (en) * | 2012-09-20 | 2012-12-26 | 北京工业大学 | High frequency pulse power supply device |
| CN102916606B (en) * | 2012-10-16 | 2015-01-14 | 北京工业大学 | Novel AC pulse power supply device |
| CN103354428B (en) * | 2013-06-17 | 2015-07-01 | 北京航空航天大学 | Super-audio frequency fast-transformation DC (direct current) pulse plasma spraying power supply |
| CN103331505B (en) * | 2013-07-12 | 2015-05-27 | 宣浩 | Electric spark bead welding circuit |
| CN104923884A (en) * | 2015-06-19 | 2015-09-23 | 北京航空航天大学 | Ultrasonic frequency direct current pulse fusion welding method |
| CN106270939B (en) * | 2016-09-10 | 2017-12-08 | 北京工业大学 | A kind of double arc TIG weld supply units |
| CN106735730A (en) * | 2016-12-21 | 2017-05-31 | 北京航空航天大学 | Electric arc silk filling increasing material manufacturing method and device |
| CN106735734B (en) * | 2017-01-09 | 2019-04-05 | 北京工业大学 | A kind of high frequency pulse TIG welding connects power-supply device |
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|---|---|---|---|---|
| US3564294A (en) * | 1967-06-09 | 1971-02-16 | Welding Inst | Pulse welding circuits |
| US3586882A (en) * | 1969-01-08 | 1971-06-22 | Hughes Aircraft Co | Capacitor bleed circuit |
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| CN101125390A (en) | 2008-02-20 |
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